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freebsd-skq/contrib/unbound/services/authzone.c
Xin LI 7341cb0cd1 MFV r368746: 
Apply upstream fix 08968baec1122a58bb90d8f97ad948a75f8a5d69:

Fix error cases when udp-connect is set and send() returns an error

Obtained from:	unbound git
MFC after:	3 days
2020-12-18 04:23:20 +00:00

6970 lines
202 KiB
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/*
* services/authzone.c - authoritative zone that is locally hosted.
*
* Copyright (c) 2017, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains the functions for an authority zone. This zone
* is queried by the iterator, just like a stub or forward zone, but then
* the data is locally held.
*/
#include "config.h"
#include "services/authzone.h"
#include "util/data/dname.h"
#include "util/data/msgparse.h"
#include "util/data/msgreply.h"
#include "util/data/msgencode.h"
#include "util/data/packed_rrset.h"
#include "util/regional.h"
#include "util/net_help.h"
#include "util/netevent.h"
#include "util/config_file.h"
#include "util/log.h"
#include "util/module.h"
#include "util/random.h"
#include "services/cache/dns.h"
#include "services/outside_network.h"
#include "services/listen_dnsport.h"
#include "services/mesh.h"
#include "sldns/rrdef.h"
#include "sldns/pkthdr.h"
#include "sldns/sbuffer.h"
#include "sldns/str2wire.h"
#include "sldns/wire2str.h"
#include "sldns/parseutil.h"
#include "sldns/keyraw.h"
#include "validator/val_nsec3.h"
#include "validator/val_secalgo.h"
#include <ctype.h>
/** bytes to use for NSEC3 hash buffer. 20 for sha1 */
#define N3HASHBUFLEN 32
/** max number of CNAMEs we are willing to follow (in one answer) */
#define MAX_CNAME_CHAIN 8
/** timeout for probe packets for SOA */
#define AUTH_PROBE_TIMEOUT 100 /* msec */
/** when to stop with SOA probes (when exponential timeouts exceed this) */
#define AUTH_PROBE_TIMEOUT_STOP 1000 /* msec */
/* auth transfer timeout for TCP connections, in msec */
#define AUTH_TRANSFER_TIMEOUT 10000 /* msec */
/* auth transfer max backoff for failed tranfers and probes */
#define AUTH_TRANSFER_MAX_BACKOFF 86400 /* sec */
/* auth http port number */
#define AUTH_HTTP_PORT 80
/* auth https port number */
#define AUTH_HTTPS_PORT 443
/* max depth for nested $INCLUDEs */
#define MAX_INCLUDE_DEPTH 10
/** number of timeouts before we fallback from IXFR to AXFR,
* because some versions of servers (eg. dnsmasq) drop IXFR packets. */
#define NUM_TIMEOUTS_FALLBACK_IXFR 3
/** pick up nextprobe task to start waiting to perform transfer actions */
static void xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env,
int failure, int lookup_only);
/** move to sending the probe packets, next if fails. task_probe */
static void xfr_probe_send_or_end(struct auth_xfer* xfr,
struct module_env* env);
/** pick up probe task with specified(or NULL) destination first,
* or transfer task if nothing to probe, or false if already in progress */
static int xfr_start_probe(struct auth_xfer* xfr, struct module_env* env,
struct auth_master* spec);
/** delete xfer structure (not its tree entry) */
static void auth_xfer_delete(struct auth_xfer* xfr);
/** create new dns_msg */
static struct dns_msg*
msg_create(struct regional* region, struct query_info* qinfo)
{
struct dns_msg* msg = (struct dns_msg*)regional_alloc(region,
sizeof(struct dns_msg));
if(!msg)
return NULL;
msg->qinfo.qname = regional_alloc_init(region, qinfo->qname,
qinfo->qname_len);
if(!msg->qinfo.qname)
return NULL;
msg->qinfo.qname_len = qinfo->qname_len;
msg->qinfo.qtype = qinfo->qtype;
msg->qinfo.qclass = qinfo->qclass;
msg->qinfo.local_alias = NULL;
/* non-packed reply_info, because it needs to grow the array */
msg->rep = (struct reply_info*)regional_alloc_zero(region,
sizeof(struct reply_info)-sizeof(struct rrset_ref));
if(!msg->rep)
return NULL;
msg->rep->flags = (uint16_t)(BIT_QR | BIT_AA);
msg->rep->authoritative = 1;
msg->rep->qdcount = 1;
/* rrsets is NULL, no rrsets yet */
return msg;
}
/** grow rrset array by one in msg */
static int
msg_grow_array(struct regional* region, struct dns_msg* msg)
{
if(msg->rep->rrsets == NULL) {
msg->rep->rrsets = regional_alloc_zero(region,
sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1));
if(!msg->rep->rrsets)
return 0;
} else {
struct ub_packed_rrset_key** rrsets_old = msg->rep->rrsets;
msg->rep->rrsets = regional_alloc_zero(region,
sizeof(struct ub_packed_rrset_key*)*(msg->rep->rrset_count+1));
if(!msg->rep->rrsets)
return 0;
memmove(msg->rep->rrsets, rrsets_old,
sizeof(struct ub_packed_rrset_key*)*msg->rep->rrset_count);
}
return 1;
}
/** get ttl of rrset */
static time_t
get_rrset_ttl(struct ub_packed_rrset_key* k)
{
struct packed_rrset_data* d = (struct packed_rrset_data*)
k->entry.data;
return d->ttl;
}
/** Copy rrset into region from domain-datanode and packet rrset */
static struct ub_packed_rrset_key*
auth_packed_rrset_copy_region(struct auth_zone* z, struct auth_data* node,
struct auth_rrset* rrset, struct regional* region, time_t adjust)
{
struct ub_packed_rrset_key key;
memset(&key, 0, sizeof(key));
key.entry.key = &key;
key.entry.data = rrset->data;
key.rk.dname = node->name;
key.rk.dname_len = node->namelen;
key.rk.type = htons(rrset->type);
key.rk.rrset_class = htons(z->dclass);
key.entry.hash = rrset_key_hash(&key.rk);
return packed_rrset_copy_region(&key, region, adjust);
}
/** fix up msg->rep TTL and prefetch ttl */
static void
msg_ttl(struct dns_msg* msg)
{
if(msg->rep->rrset_count == 0) return;
if(msg->rep->rrset_count == 1) {
msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]);
msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
} else if(get_rrset_ttl(msg->rep->rrsets[msg->rep->rrset_count-1]) <
msg->rep->ttl) {
msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[
msg->rep->rrset_count-1]);
msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
}
}
/** see if rrset is a duplicate in the answer message */
static int
msg_rrset_duplicate(struct dns_msg* msg, uint8_t* nm, size_t nmlen,
uint16_t type, uint16_t dclass)
{
size_t i;
for(i=0; i<msg->rep->rrset_count; i++) {
struct ub_packed_rrset_key* k = msg->rep->rrsets[i];
if(ntohs(k->rk.type) == type && k->rk.dname_len == nmlen &&
ntohs(k->rk.rrset_class) == dclass &&
query_dname_compare(k->rk.dname, nm) == 0)
return 1;
}
return 0;
}
/** add rrset to answer section (no auth, add rrsets yet) */
static int
msg_add_rrset_an(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
{
log_assert(msg->rep->ns_numrrsets == 0);
log_assert(msg->rep->ar_numrrsets == 0);
if(!rrset || !node)
return 1;
if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
z->dclass))
return 1;
/* grow array */
if(!msg_grow_array(region, msg))
return 0;
/* copy it */
if(!(msg->rep->rrsets[msg->rep->rrset_count] =
auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
return 0;
msg->rep->rrset_count++;
msg->rep->an_numrrsets++;
msg_ttl(msg);
return 1;
}
/** add rrset to authority section (no additonal section rrsets yet) */
static int
msg_add_rrset_ns(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
{
log_assert(msg->rep->ar_numrrsets == 0);
if(!rrset || !node)
return 1;
if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
z->dclass))
return 1;
/* grow array */
if(!msg_grow_array(region, msg))
return 0;
/* copy it */
if(!(msg->rep->rrsets[msg->rep->rrset_count] =
auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
return 0;
msg->rep->rrset_count++;
msg->rep->ns_numrrsets++;
msg_ttl(msg);
return 1;
}
/** add rrset to additional section */
static int
msg_add_rrset_ar(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
{
if(!rrset || !node)
return 1;
if(msg_rrset_duplicate(msg, node->name, node->namelen, rrset->type,
z->dclass))
return 1;
/* grow array */
if(!msg_grow_array(region, msg))
return 0;
/* copy it */
if(!(msg->rep->rrsets[msg->rep->rrset_count] =
auth_packed_rrset_copy_region(z, node, rrset, region, 0)))
return 0;
msg->rep->rrset_count++;
msg->rep->ar_numrrsets++;
msg_ttl(msg);
return 1;
}
struct auth_zones* auth_zones_create(void)
{
struct auth_zones* az = (struct auth_zones*)calloc(1, sizeof(*az));
if(!az) {
log_err("out of memory");
return NULL;
}
rbtree_init(&az->ztree, &auth_zone_cmp);
rbtree_init(&az->xtree, &auth_xfer_cmp);
lock_rw_init(&az->lock);
lock_protect(&az->lock, &az->ztree, sizeof(az->ztree));
lock_protect(&az->lock, &az->xtree, sizeof(az->xtree));
/* also lock protects the rbnode's in struct auth_zone, auth_xfer */
lock_rw_init(&az->rpz_lock);
lock_protect(&az->rpz_lock, &az->rpz_first, sizeof(az->rpz_first));
return az;
}
int auth_zone_cmp(const void* z1, const void* z2)
{
/* first sort on class, so that hierarchy can be maintained within
* a class */
struct auth_zone* a = (struct auth_zone*)z1;
struct auth_zone* b = (struct auth_zone*)z2;
int m;
if(a->dclass != b->dclass) {
if(a->dclass < b->dclass)
return -1;
return 1;
}
/* sorted such that higher zones sort before lower zones (their
* contents) */
return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
}
int auth_data_cmp(const void* z1, const void* z2)
{
struct auth_data* a = (struct auth_data*)z1;
struct auth_data* b = (struct auth_data*)z2;
int m;
/* canonical sort, because DNSSEC needs that */
return dname_canon_lab_cmp(a->name, a->namelabs, b->name,
b->namelabs, &m);
}
int auth_xfer_cmp(const void* z1, const void* z2)
{
/* first sort on class, so that hierarchy can be maintained within
* a class */
struct auth_xfer* a = (struct auth_xfer*)z1;
struct auth_xfer* b = (struct auth_xfer*)z2;
int m;
if(a->dclass != b->dclass) {
if(a->dclass < b->dclass)
return -1;
return 1;
}
/* sorted such that higher zones sort before lower zones (their
* contents) */
return dname_lab_cmp(a->name, a->namelabs, b->name, b->namelabs, &m);
}
/** delete auth rrset node */
static void
auth_rrset_delete(struct auth_rrset* rrset)
{
if(!rrset) return;
free(rrset->data);
free(rrset);
}
/** delete auth data domain node */
static void
auth_data_delete(struct auth_data* n)
{
struct auth_rrset* p, *np;
if(!n) return;
p = n->rrsets;
while(p) {
np = p->next;
auth_rrset_delete(p);
p = np;
}
free(n->name);
free(n);
}
/** helper traverse to delete zones */
static void
auth_data_del(rbnode_type* n, void* ATTR_UNUSED(arg))
{
struct auth_data* z = (struct auth_data*)n->key;
auth_data_delete(z);
}
/** delete an auth zone structure (tree remove must be done elsewhere) */
static void
auth_zone_delete(struct auth_zone* z, struct auth_zones* az)
{
if(!z) return;
lock_rw_destroy(&z->lock);
traverse_postorder(&z->data, auth_data_del, NULL);
if(az && z->rpz) {
/* keep RPZ linked list intact */
lock_rw_wrlock(&az->rpz_lock);
if(z->rpz_az_prev)
z->rpz_az_prev->rpz_az_next = z->rpz_az_next;
else
az->rpz_first = z->rpz_az_next;
if(z->rpz_az_next)
z->rpz_az_next->rpz_az_prev = z->rpz_az_prev;
lock_rw_unlock(&az->rpz_lock);
}
if(z->rpz)
rpz_delete(z->rpz);
free(z->name);
free(z->zonefile);
free(z);
}
struct auth_zone*
auth_zone_create(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass)
{
struct auth_zone* z = (struct auth_zone*)calloc(1, sizeof(*z));
if(!z) {
return NULL;
}
z->node.key = z;
z->dclass = dclass;
z->namelen = nmlen;
z->namelabs = dname_count_labels(nm);
z->name = memdup(nm, nmlen);
if(!z->name) {
free(z);
return NULL;
}
rbtree_init(&z->data, &auth_data_cmp);
lock_rw_init(&z->lock);
lock_protect(&z->lock, &z->name, sizeof(*z)-sizeof(rbnode_type)-
sizeof(&z->rpz_az_next)-sizeof(&z->rpz_az_prev));
lock_rw_wrlock(&z->lock);
/* z lock protects all, except rbtree itself and the rpz linked list
* pointers, which are protected using az->lock */
if(!rbtree_insert(&az->ztree, &z->node)) {
lock_rw_unlock(&z->lock);
auth_zone_delete(z, NULL);
log_warn("duplicate auth zone");
return NULL;
}
return z;
}
struct auth_zone*
auth_zone_find(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass)
{
struct auth_zone key;
key.node.key = &key;
key.dclass = dclass;
key.name = nm;
key.namelen = nmlen;
key.namelabs = dname_count_labels(nm);
return (struct auth_zone*)rbtree_search(&az->ztree, &key);
}
struct auth_xfer*
auth_xfer_find(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass)
{
struct auth_xfer key;
key.node.key = &key;
key.dclass = dclass;
key.name = nm;
key.namelen = nmlen;
key.namelabs = dname_count_labels(nm);
return (struct auth_xfer*)rbtree_search(&az->xtree, &key);
}
/** find an auth zone or sorted less-or-equal, return true if exact */
static int
auth_zone_find_less_equal(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass, struct auth_zone** z)
{
struct auth_zone key;
key.node.key = &key;
key.dclass = dclass;
key.name = nm;
key.namelen = nmlen;
key.namelabs = dname_count_labels(nm);
return rbtree_find_less_equal(&az->ztree, &key, (rbnode_type**)z);
}
/** find the auth zone that is above the given name */
struct auth_zone*
auth_zones_find_zone(struct auth_zones* az, uint8_t* name, size_t name_len,
uint16_t dclass)
{
uint8_t* nm = name;
size_t nmlen = name_len;
struct auth_zone* z;
if(auth_zone_find_less_equal(az, nm, nmlen, dclass, &z)) {
/* exact match */
return z;
} else {
/* less-or-nothing */
if(!z) return NULL; /* nothing smaller, nothing above it */
/* we found smaller name; smaller may be above the name,
* but not below it. */
nm = dname_get_shared_topdomain(z->name, name);
dname_count_size_labels(nm, &nmlen);
z = NULL;
}
/* search up */
while(!z) {
z = auth_zone_find(az, nm, nmlen, dclass);
if(z) return z;
if(dname_is_root(nm)) break;
dname_remove_label(&nm, &nmlen);
}
return NULL;
}
/** find or create zone with name str. caller must have lock on az.
* returns a wrlocked zone */
static struct auth_zone*
auth_zones_find_or_add_zone(struct auth_zones* az, char* name)
{
uint8_t nm[LDNS_MAX_DOMAINLEN+1];
size_t nmlen = sizeof(nm);
struct auth_zone* z;
if(sldns_str2wire_dname_buf(name, nm, &nmlen) != 0) {
log_err("cannot parse auth zone name: %s", name);
return 0;
}
z = auth_zone_find(az, nm, nmlen, LDNS_RR_CLASS_IN);
if(!z) {
/* not found, create the zone */
z = auth_zone_create(az, nm, nmlen, LDNS_RR_CLASS_IN);
} else {
lock_rw_wrlock(&z->lock);
}
return z;
}
/** find or create xfer zone with name str. caller must have lock on az.
* returns a locked xfer */
static struct auth_xfer*
auth_zones_find_or_add_xfer(struct auth_zones* az, struct auth_zone* z)
{
struct auth_xfer* x;
x = auth_xfer_find(az, z->name, z->namelen, z->dclass);
if(!x) {
/* not found, create the zone */
x = auth_xfer_create(az, z);
} else {
lock_basic_lock(&x->lock);
}
return x;
}
int
auth_zone_set_zonefile(struct auth_zone* z, char* zonefile)
{
if(z->zonefile) free(z->zonefile);
if(zonefile == NULL) {
z->zonefile = NULL;
} else {
z->zonefile = strdup(zonefile);
if(!z->zonefile) {
log_err("malloc failure");
return 0;
}
}
return 1;
}
/** set auth zone fallback. caller must have lock on zone */
int
auth_zone_set_fallback(struct auth_zone* z, char* fallbackstr)
{
if(strcmp(fallbackstr, "yes") != 0 && strcmp(fallbackstr, "no") != 0){
log_err("auth zone fallback, expected yes or no, got %s",
fallbackstr);
return 0;
}
z->fallback_enabled = (strcmp(fallbackstr, "yes")==0);
return 1;
}
/** create domain with the given name */
static struct auth_data*
az_domain_create(struct auth_zone* z, uint8_t* nm, size_t nmlen)
{
struct auth_data* n = (struct auth_data*)malloc(sizeof(*n));
if(!n) return NULL;
memset(n, 0, sizeof(*n));
n->node.key = n;
n->name = memdup(nm, nmlen);
if(!n->name) {
free(n);
return NULL;
}
n->namelen = nmlen;
n->namelabs = dname_count_labels(nm);
if(!rbtree_insert(&z->data, &n->node)) {
log_warn("duplicate auth domain name");
free(n->name);
free(n);
return NULL;
}
return n;
}
/** find domain with exactly the given name */
static struct auth_data*
az_find_name(struct auth_zone* z, uint8_t* nm, size_t nmlen)
{
struct auth_zone key;
key.node.key = &key;
key.name = nm;
key.namelen = nmlen;
key.namelabs = dname_count_labels(nm);
return (struct auth_data*)rbtree_search(&z->data, &key);
}
/** Find domain name (or closest match) */
static void
az_find_domain(struct auth_zone* z, struct query_info* qinfo, int* node_exact,
struct auth_data** node)
{
struct auth_zone key;
key.node.key = &key;
key.name = qinfo->qname;
key.namelen = qinfo->qname_len;
key.namelabs = dname_count_labels(key.name);
*node_exact = rbtree_find_less_equal(&z->data, &key,
(rbnode_type**)node);
}
/** find or create domain with name in zone */
static struct auth_data*
az_domain_find_or_create(struct auth_zone* z, uint8_t* dname,
size_t dname_len)
{
struct auth_data* n = az_find_name(z, dname, dname_len);
if(!n) {
n = az_domain_create(z, dname, dname_len);
}
return n;
}
/** find rrset of given type in the domain */
static struct auth_rrset*
az_domain_rrset(struct auth_data* n, uint16_t t)
{
struct auth_rrset* rrset;
if(!n) return NULL;
rrset = n->rrsets;
while(rrset) {
if(rrset->type == t)
return rrset;
rrset = rrset->next;
}
return NULL;
}
/** remove rrset of this type from domain */
static void
domain_remove_rrset(struct auth_data* node, uint16_t rr_type)
{
struct auth_rrset* rrset, *prev;
if(!node) return;
prev = NULL;
rrset = node->rrsets;
while(rrset) {
if(rrset->type == rr_type) {
/* found it, now delete it */
if(prev) prev->next = rrset->next;
else node->rrsets = rrset->next;
auth_rrset_delete(rrset);
return;
}
prev = rrset;
rrset = rrset->next;
}
}
/** find an rrsig index in the rrset. returns true if found */
static int
az_rrset_find_rrsig(struct packed_rrset_data* d, uint8_t* rdata, size_t len,
size_t* index)
{
size_t i;
for(i=d->count; i<d->count + d->rrsig_count; i++) {
if(d->rr_len[i] != len)
continue;
if(memcmp(d->rr_data[i], rdata, len) == 0) {
*index = i;
return 1;
}
}
return 0;
}
/** see if rdata is duplicate */
static int
rdata_duplicate(struct packed_rrset_data* d, uint8_t* rdata, size_t len)
{
size_t i;
for(i=0; i<d->count + d->rrsig_count; i++) {
if(d->rr_len[i] != len)
continue;
if(memcmp(d->rr_data[i], rdata, len) == 0)
return 1;
}
return 0;
}
/** get rrsig type covered from rdata.
* @param rdata: rdata in wireformat, starting with 16bit rdlength.
* @param rdatalen: length of rdata buffer.
* @return type covered (or 0).
*/
static uint16_t
rrsig_rdata_get_type_covered(uint8_t* rdata, size_t rdatalen)
{
if(rdatalen < 4)
return 0;
return sldns_read_uint16(rdata+2);
}
/** remove RR from existing RRset. Also sig, if it is a signature.
* reallocates the packed rrset for a new one, false on alloc failure */
static int
rrset_remove_rr(struct auth_rrset* rrset, size_t index)
{
struct packed_rrset_data* d, *old = rrset->data;
size_t i;
if(index >= old->count + old->rrsig_count)
return 0; /* index out of bounds */
d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old) - (
sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t) +
old->rr_len[index]));
if(!d) {
log_err("malloc failure");
return 0;
}
d->ttl = old->ttl;
d->count = old->count;
d->rrsig_count = old->rrsig_count;
if(index < d->count) d->count--;
else d->rrsig_count--;
d->trust = old->trust;
d->security = old->security;
/* set rr_len, needed for ptr_fixup */
d->rr_len = (size_t*)((uint8_t*)d +
sizeof(struct packed_rrset_data));
if(index > 0)
memmove(d->rr_len, old->rr_len, (index)*sizeof(size_t));
if(index+1 < old->count+old->rrsig_count)
memmove(&d->rr_len[index], &old->rr_len[index+1],
(old->count+old->rrsig_count - (index+1))*sizeof(size_t));
packed_rrset_ptr_fixup(d);
/* move over ttls */
if(index > 0)
memmove(d->rr_ttl, old->rr_ttl, (index)*sizeof(time_t));
if(index+1 < old->count+old->rrsig_count)
memmove(&d->rr_ttl[index], &old->rr_ttl[index+1],
(old->count+old->rrsig_count - (index+1))*sizeof(time_t));
/* move over rr_data */
for(i=0; i<d->count+d->rrsig_count; i++) {
size_t oldi;
if(i < index) oldi = i;
else oldi = i+1;
memmove(d->rr_data[i], old->rr_data[oldi], d->rr_len[i]);
}
/* recalc ttl (lowest of remaining RR ttls) */
if(d->count + d->rrsig_count > 0)
d->ttl = d->rr_ttl[0];
for(i=0; i<d->count+d->rrsig_count; i++) {
if(d->rr_ttl[i] < d->ttl)
d->ttl = d->rr_ttl[i];
}
free(rrset->data);
rrset->data = d;
return 1;
}
/** add RR to existing RRset. If insert_sig is true, add to rrsigs.
* This reallocates the packed rrset for a new one */
static int
rrset_add_rr(struct auth_rrset* rrset, uint32_t rr_ttl, uint8_t* rdata,
size_t rdatalen, int insert_sig)
{
struct packed_rrset_data* d, *old = rrset->data;
size_t total, old_total;
d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old)
+ sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t)
+ rdatalen);
if(!d) {
log_err("out of memory");
return 0;
}
/* copy base values */
memcpy(d, old, sizeof(struct packed_rrset_data));
if(!insert_sig) {
d->count++;
} else {
d->rrsig_count++;
}
old_total = old->count + old->rrsig_count;
total = d->count + d->rrsig_count;
/* set rr_len, needed for ptr_fixup */
d->rr_len = (size_t*)((uint8_t*)d +
sizeof(struct packed_rrset_data));
if(old->count != 0)
memmove(d->rr_len, old->rr_len, old->count*sizeof(size_t));
if(old->rrsig_count != 0)
memmove(d->rr_len+d->count, old->rr_len+old->count,
old->rrsig_count*sizeof(size_t));
if(!insert_sig)
d->rr_len[d->count-1] = rdatalen;
else d->rr_len[total-1] = rdatalen;
packed_rrset_ptr_fixup(d);
if((time_t)rr_ttl < d->ttl)
d->ttl = rr_ttl;
/* copy old values into new array */
if(old->count != 0) {
memmove(d->rr_ttl, old->rr_ttl, old->count*sizeof(time_t));
/* all the old rr pieces are allocated sequential, so we
* can copy them in one go */
memmove(d->rr_data[0], old->rr_data[0],
(old->rr_data[old->count-1] - old->rr_data[0]) +
old->rr_len[old->count-1]);
}
if(old->rrsig_count != 0) {
memmove(d->rr_ttl+d->count, old->rr_ttl+old->count,
old->rrsig_count*sizeof(time_t));
memmove(d->rr_data[d->count], old->rr_data[old->count],
(old->rr_data[old_total-1] - old->rr_data[old->count]) +
old->rr_len[old_total-1]);
}
/* insert new value */
if(!insert_sig) {
d->rr_ttl[d->count-1] = rr_ttl;
memmove(d->rr_data[d->count-1], rdata, rdatalen);
} else {
d->rr_ttl[total-1] = rr_ttl;
memmove(d->rr_data[total-1], rdata, rdatalen);
}
rrset->data = d;
free(old);
return 1;
}
/** Create new rrset for node with packed rrset with one RR element */
static struct auth_rrset*
rrset_create(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl,
uint8_t* rdata, size_t rdatalen)
{
struct auth_rrset* rrset = (struct auth_rrset*)calloc(1,
sizeof(*rrset));
struct auth_rrset* p, *prev;
struct packed_rrset_data* d;
if(!rrset) {
log_err("out of memory");
return NULL;
}
rrset->type = rr_type;
/* the rrset data structure, with one RR */
d = (struct packed_rrset_data*)calloc(1,
sizeof(struct packed_rrset_data) + sizeof(size_t) +
sizeof(uint8_t*) + sizeof(time_t) + rdatalen);
if(!d) {
free(rrset);
log_err("out of memory");
return NULL;
}
rrset->data = d;
d->ttl = rr_ttl;
d->trust = rrset_trust_prim_noglue;
d->rr_len = (size_t*)((uint8_t*)d + sizeof(struct packed_rrset_data));
d->rr_data = (uint8_t**)&(d->rr_len[1]);
d->rr_ttl = (time_t*)&(d->rr_data[1]);
d->rr_data[0] = (uint8_t*)&(d->rr_ttl[1]);
/* insert the RR */
d->rr_len[0] = rdatalen;
d->rr_ttl[0] = rr_ttl;
memmove(d->rr_data[0], rdata, rdatalen);
d->count++;
/* insert rrset into linked list for domain */
/* find sorted place to link the rrset into the list */
prev = NULL;
p = node->rrsets;
while(p && p->type<=rr_type) {
prev = p;
p = p->next;
}
/* so, prev is smaller, and p is larger than rr_type */
rrset->next = p;
if(prev) prev->next = rrset;
else node->rrsets = rrset;
return rrset;
}
/** count number (and size) of rrsigs that cover a type */
static size_t
rrsig_num_that_cover(struct auth_rrset* rrsig, uint16_t rr_type, size_t* sigsz)
{
struct packed_rrset_data* d = rrsig->data;
size_t i, num = 0;
*sigsz = 0;
log_assert(d && rrsig->type == LDNS_RR_TYPE_RRSIG);
for(i=0; i<d->count+d->rrsig_count; i++) {
if(rrsig_rdata_get_type_covered(d->rr_data[i],
d->rr_len[i]) == rr_type) {
num++;
(*sigsz) += d->rr_len[i];
}
}
return num;
}
/** See if rrsig set has covered sigs for rrset and move them over */
static int
rrset_moveover_rrsigs(struct auth_data* node, uint16_t rr_type,
struct auth_rrset* rrset, struct auth_rrset* rrsig)
{
size_t sigs, sigsz, i, j, total;
struct packed_rrset_data* sigold = rrsig->data;
struct packed_rrset_data* old = rrset->data;
struct packed_rrset_data* d, *sigd;
log_assert(rrset->type == rr_type);
log_assert(rrsig->type == LDNS_RR_TYPE_RRSIG);
sigs = rrsig_num_that_cover(rrsig, rr_type, &sigsz);
if(sigs == 0) {
/* 0 rrsigs to move over, done */
return 1;
}
/* allocate rrset sigsz larger for extra sigs elements, and
* allocate rrsig sigsz smaller for less sigs elements. */
d = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(old)
+ sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t))
+ sigsz);
if(!d) {
log_err("out of memory");
return 0;
}
/* copy base values */
total = old->count + old->rrsig_count;
memcpy(d, old, sizeof(struct packed_rrset_data));
d->rrsig_count += sigs;
/* setup rr_len */
d->rr_len = (size_t*)((uint8_t*)d +
sizeof(struct packed_rrset_data));
if(total != 0)
memmove(d->rr_len, old->rr_len, total*sizeof(size_t));
j = d->count+d->rrsig_count-sigs;
for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
sigold->rr_len[i]) == rr_type) {
d->rr_len[j] = sigold->rr_len[i];
j++;
}
}
packed_rrset_ptr_fixup(d);
/* copy old values into new array */
if(total != 0) {
memmove(d->rr_ttl, old->rr_ttl, total*sizeof(time_t));
/* all the old rr pieces are allocated sequential, so we
* can copy them in one go */
memmove(d->rr_data[0], old->rr_data[0],
(old->rr_data[total-1] - old->rr_data[0]) +
old->rr_len[total-1]);
}
/* move over the rrsigs to the larger rrset*/
j = d->count+d->rrsig_count-sigs;
for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
sigold->rr_len[i]) == rr_type) {
/* move this one over to location j */
d->rr_ttl[j] = sigold->rr_ttl[i];
memmove(d->rr_data[j], sigold->rr_data[i],
sigold->rr_len[i]);
if(d->rr_ttl[j] < d->ttl)
d->ttl = d->rr_ttl[j];
j++;
}
}
/* put it in and deallocate the old rrset */
rrset->data = d;
free(old);
/* now make rrsig set smaller */
if(sigold->count+sigold->rrsig_count == sigs) {
/* remove all sigs from rrsig, remove it entirely */
domain_remove_rrset(node, LDNS_RR_TYPE_RRSIG);
return 1;
}
log_assert(packed_rrset_sizeof(sigold) > sigs*(sizeof(size_t) +
sizeof(uint8_t*) + sizeof(time_t)) + sigsz);
sigd = (struct packed_rrset_data*)calloc(1, packed_rrset_sizeof(sigold)
- sigs*(sizeof(size_t) + sizeof(uint8_t*) + sizeof(time_t))
- sigsz);
if(!sigd) {
/* no need to free up d, it has already been placed in the
* node->rrset structure */
log_err("out of memory");
return 0;
}
/* copy base values */
memcpy(sigd, sigold, sizeof(struct packed_rrset_data));
/* in sigd the RRSIGs are stored in the base of the RR, in count */
sigd->count -= sigs;
/* setup rr_len */
sigd->rr_len = (size_t*)((uint8_t*)sigd +
sizeof(struct packed_rrset_data));
j = 0;
for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
sigold->rr_len[i]) != rr_type) {
sigd->rr_len[j] = sigold->rr_len[i];
j++;
}
}
packed_rrset_ptr_fixup(sigd);
/* copy old values into new rrsig array */
j = 0;
for(i=0; i<sigold->count+sigold->rrsig_count; i++) {
if(rrsig_rdata_get_type_covered(sigold->rr_data[i],
sigold->rr_len[i]) != rr_type) {
/* move this one over to location j */
sigd->rr_ttl[j] = sigold->rr_ttl[i];
memmove(sigd->rr_data[j], sigold->rr_data[i],
sigold->rr_len[i]);
if(j==0) sigd->ttl = sigd->rr_ttl[j];
else {
if(sigd->rr_ttl[j] < sigd->ttl)
sigd->ttl = sigd->rr_ttl[j];
}
j++;
}
}
/* put it in and deallocate the old rrset */
rrsig->data = sigd;
free(sigold);
return 1;
}
/** copy the rrsigs from the rrset to the rrsig rrset, because the rrset
* is going to be deleted. reallocates the RRSIG rrset data. */
static int
rrsigs_copy_from_rrset_to_rrsigset(struct auth_rrset* rrset,
struct auth_rrset* rrsigset)
{
size_t i;
if(rrset->data->rrsig_count == 0)
return 1;
/* move them over one by one, because there might be duplicates,
* duplicates are ignored */
for(i=rrset->data->count;
i<rrset->data->count+rrset->data->rrsig_count; i++) {
uint8_t* rdata = rrset->data->rr_data[i];
size_t rdatalen = rrset->data->rr_len[i];
time_t rr_ttl = rrset->data->rr_ttl[i];
if(rdata_duplicate(rrsigset->data, rdata, rdatalen)) {
continue;
}
if(!rrset_add_rr(rrsigset, rr_ttl, rdata, rdatalen, 0))
return 0;
}
return 1;
}
/** Add rr to node, ignores duplicate RRs,
* rdata points to buffer with rdatalen octets, starts with 2bytelength. */
static int
az_domain_add_rr(struct auth_data* node, uint16_t rr_type, uint32_t rr_ttl,
uint8_t* rdata, size_t rdatalen, int* duplicate)
{
struct auth_rrset* rrset;
/* packed rrsets have their rrsigs along with them, sort them out */
if(rr_type == LDNS_RR_TYPE_RRSIG) {
uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen);
if((rrset=az_domain_rrset(node, ctype))!= NULL) {
/* a node of the correct type exists, add the RRSIG
* to the rrset of the covered data type */
if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
if(duplicate) *duplicate = 1;
return 1;
}
if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 1))
return 0;
} else if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
/* add RRSIG to rrset of type RRSIG */
if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
if(duplicate) *duplicate = 1;
return 1;
}
if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0))
return 0;
} else {
/* create rrset of type RRSIG */
if(!rrset_create(node, rr_type, rr_ttl, rdata,
rdatalen))
return 0;
}
} else {
/* normal RR type */
if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
/* add data to existing node with data type */
if(rdata_duplicate(rrset->data, rdata, rdatalen)) {
if(duplicate) *duplicate = 1;
return 1;
}
if(!rrset_add_rr(rrset, rr_ttl, rdata, rdatalen, 0))
return 0;
} else {
struct auth_rrset* rrsig;
/* create new node with data type */
if(!(rrset=rrset_create(node, rr_type, rr_ttl, rdata,
rdatalen)))
return 0;
/* see if node of type RRSIG has signatures that
* cover the data type, and move them over */
/* and then make the RRSIG type smaller */
if((rrsig=az_domain_rrset(node, LDNS_RR_TYPE_RRSIG))
!= NULL) {
if(!rrset_moveover_rrsigs(node, rr_type,
rrset, rrsig))
return 0;
}
}
}
return 1;
}
/** insert RR into zone, ignore duplicates */
static int
az_insert_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len,
size_t dname_len, int* duplicate)
{
struct auth_data* node;
uint8_t* dname = rr;
uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len);
uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len);
uint32_t rr_ttl = sldns_wirerr_get_ttl(rr, rr_len, dname_len);
size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len,
dname_len))+2;
/* rdata points to rdata prefixed with uint16 rdatalength */
uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len);
if(rr_class != z->dclass) {
log_err("wrong class for RR");
return 0;
}
if(!(node=az_domain_find_or_create(z, dname, dname_len))) {
log_err("cannot create domain");
return 0;
}
if(!az_domain_add_rr(node, rr_type, rr_ttl, rdata, rdatalen,
duplicate)) {
log_err("cannot add RR to domain");
return 0;
}
if(z->rpz) {
if(!(rpz_insert_rr(z->rpz, z->name, z->namelen, dname,
dname_len, rr_type, rr_class, rr_ttl, rdata, rdatalen,
rr, rr_len)))
return 0;
}
return 1;
}
/** Remove rr from node, ignores nonexisting RRs,
* rdata points to buffer with rdatalen octets, starts with 2bytelength. */
static int
az_domain_remove_rr(struct auth_data* node, uint16_t rr_type,
uint8_t* rdata, size_t rdatalen, int* nonexist)
{
struct auth_rrset* rrset;
size_t index = 0;
/* find the plain RR of the given type */
if((rrset=az_domain_rrset(node, rr_type))!= NULL) {
if(packed_rrset_find_rr(rrset->data, rdata, rdatalen, &index)) {
if(rrset->data->count == 1 &&
rrset->data->rrsig_count == 0) {
/* last RR, delete the rrset */
domain_remove_rrset(node, rr_type);
} else if(rrset->data->count == 1 &&
rrset->data->rrsig_count != 0) {
/* move RRSIGs to the RRSIG rrset, or
* this one becomes that RRset */
struct auth_rrset* rrsigset = az_domain_rrset(
node, LDNS_RR_TYPE_RRSIG);
if(rrsigset) {
/* move left over rrsigs to the
* existing rrset of type RRSIG */
rrsigs_copy_from_rrset_to_rrsigset(
rrset, rrsigset);
/* and then delete the rrset */
domain_remove_rrset(node, rr_type);
} else {
/* no rrset of type RRSIG, this
* set is now of that type,
* just remove the rr */
if(!rrset_remove_rr(rrset, index))
return 0;
rrset->type = LDNS_RR_TYPE_RRSIG;
rrset->data->count = rrset->data->rrsig_count;
rrset->data->rrsig_count = 0;
}
} else {
/* remove the RR from the rrset */
if(!rrset_remove_rr(rrset, index))
return 0;
}
return 1;
}
/* rr not found in rrset */
}
/* is it a type RRSIG, look under the covered type */
if(rr_type == LDNS_RR_TYPE_RRSIG) {
uint16_t ctype = rrsig_rdata_get_type_covered(rdata, rdatalen);
if((rrset=az_domain_rrset(node, ctype))!= NULL) {
if(az_rrset_find_rrsig(rrset->data, rdata, rdatalen,
&index)) {
/* rrsig should have d->count > 0, be
* over some rr of that type */
/* remove the rrsig from the rrsigs list of the
* rrset */
if(!rrset_remove_rr(rrset, index))
return 0;
return 1;
}
}
/* also RRSIG not found */
}
/* nothing found to delete */
if(nonexist) *nonexist = 1;
return 1;
}
/** remove RR from zone, ignore if it does not exist, false on alloc failure*/
static int
az_remove_rr(struct auth_zone* z, uint8_t* rr, size_t rr_len,
size_t dname_len, int* nonexist)
{
struct auth_data* node;
uint8_t* dname = rr;
uint16_t rr_type = sldns_wirerr_get_type(rr, rr_len, dname_len);
uint16_t rr_class = sldns_wirerr_get_class(rr, rr_len, dname_len);
size_t rdatalen = ((size_t)sldns_wirerr_get_rdatalen(rr, rr_len,
dname_len))+2;
/* rdata points to rdata prefixed with uint16 rdatalength */
uint8_t* rdata = sldns_wirerr_get_rdatawl(rr, rr_len, dname_len);
if(rr_class != z->dclass) {
log_err("wrong class for RR");
/* really also a nonexisting entry, because no records
* of that class in the zone, but return an error because
* getting records of the wrong class is a failure of the
* zone transfer */
return 0;
}
node = az_find_name(z, dname, dname_len);
if(!node) {
/* node with that name does not exist */
/* nonexisting entry, because no such name */
*nonexist = 1;
return 1;
}
if(!az_domain_remove_rr(node, rr_type, rdata, rdatalen, nonexist)) {
/* alloc failure or so */
return 0;
}
/* remove the node, if necessary */
/* an rrsets==NULL entry is not kept around for empty nonterminals,
* and also parent nodes are not kept around, so we just delete it */
if(node->rrsets == NULL) {
(void)rbtree_delete(&z->data, node);
auth_data_delete(node);
}
if(z->rpz) {
rpz_remove_rr(z->rpz, z->namelen, dname, dname_len, rr_type,
rr_class, rdata, rdatalen);
}
return 1;
}
/** decompress an RR into the buffer where it'll be an uncompressed RR
* with uncompressed dname and uncompressed rdata (dnames) */
static int
decompress_rr_into_buffer(struct sldns_buffer* buf, uint8_t* pkt,
size_t pktlen, uint8_t* dname, uint16_t rr_type, uint16_t rr_class,
uint32_t rr_ttl, uint8_t* rr_data, uint16_t rr_rdlen)
{
sldns_buffer pktbuf;
size_t dname_len = 0;
size_t rdlenpos;
size_t rdlen;
uint8_t* rd;
const sldns_rr_descriptor* desc;
sldns_buffer_init_frm_data(&pktbuf, pkt, pktlen);
sldns_buffer_clear(buf);
/* decompress dname */
sldns_buffer_set_position(&pktbuf,
(size_t)(dname - sldns_buffer_current(&pktbuf)));
dname_len = pkt_dname_len(&pktbuf);
if(dname_len == 0) return 0; /* parse fail on dname */
if(!sldns_buffer_available(buf, dname_len)) return 0;
dname_pkt_copy(&pktbuf, sldns_buffer_current(buf), dname);
sldns_buffer_skip(buf, (ssize_t)dname_len);
/* type, class, ttl and rdatalength fields */
if(!sldns_buffer_available(buf, 10)) return 0;
sldns_buffer_write_u16(buf, rr_type);
sldns_buffer_write_u16(buf, rr_class);
sldns_buffer_write_u32(buf, rr_ttl);
rdlenpos = sldns_buffer_position(buf);
sldns_buffer_write_u16(buf, 0); /* rd length position */
/* decompress rdata */
desc = sldns_rr_descript(rr_type);
rd = rr_data;
rdlen = rr_rdlen;
if(rdlen > 0 && desc && desc->_dname_count > 0) {
int count = (int)desc->_dname_count;
int rdf = 0;
size_t len; /* how much rdata to plain copy */
size_t uncompressed_len, compressed_len;
size_t oldpos;
/* decompress dnames. */
while(rdlen > 0 && count) {
switch(desc->_wireformat[rdf]) {
case LDNS_RDF_TYPE_DNAME:
sldns_buffer_set_position(&pktbuf,
(size_t)(rd -
sldns_buffer_begin(&pktbuf)));
oldpos = sldns_buffer_position(&pktbuf);
/* moves pktbuf to right after the
* compressed dname, and returns uncompressed
* dname length */
uncompressed_len = pkt_dname_len(&pktbuf);
if(!uncompressed_len)
return 0; /* parse error in dname */
if(!sldns_buffer_available(buf,
uncompressed_len))
/* dname too long for buffer */
return 0;
dname_pkt_copy(&pktbuf,
sldns_buffer_current(buf), rd);
sldns_buffer_skip(buf, (ssize_t)uncompressed_len);
compressed_len = sldns_buffer_position(
&pktbuf) - oldpos;
rd += compressed_len;
rdlen -= compressed_len;
count--;
len = 0;
break;
case LDNS_RDF_TYPE_STR:
len = rd[0] + 1;
break;
default:
len = get_rdf_size(desc->_wireformat[rdf]);
break;
}
if(len) {
if(!sldns_buffer_available(buf, len))
return 0; /* too long for buffer */
sldns_buffer_write(buf, rd, len);
rd += len;
rdlen -= len;
}
rdf++;
}
}
/* copy remaining data */
if(rdlen > 0) {
if(!sldns_buffer_available(buf, rdlen)) return 0;
sldns_buffer_write(buf, rd, rdlen);
}
/* fixup rdlength */
sldns_buffer_write_u16_at(buf, rdlenpos,
sldns_buffer_position(buf)-rdlenpos-2);
sldns_buffer_flip(buf);
return 1;
}
/** insert RR into zone, from packet, decompress RR,
* if duplicate is nonNULL set the flag but otherwise ignore duplicates */
static int
az_insert_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen,
struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type,
uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data,
uint16_t rr_rdlen, int* duplicate)
{
uint8_t* rr;
size_t rr_len;
size_t dname_len;
if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname,
rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) {
log_err("could not decompress RR");
return 0;
}
rr = sldns_buffer_begin(scratch_buffer);
rr_len = sldns_buffer_limit(scratch_buffer);
dname_len = dname_valid(rr, rr_len);
return az_insert_rr(z, rr, rr_len, dname_len, duplicate);
}
/** remove RR from zone, from packet, decompress RR,
* if nonexist is nonNULL set the flag but otherwise ignore nonexisting entries*/
static int
az_remove_rr_decompress(struct auth_zone* z, uint8_t* pkt, size_t pktlen,
struct sldns_buffer* scratch_buffer, uint8_t* dname, uint16_t rr_type,
uint16_t rr_class, uint32_t rr_ttl, uint8_t* rr_data,
uint16_t rr_rdlen, int* nonexist)
{
uint8_t* rr;
size_t rr_len;
size_t dname_len;
if(!decompress_rr_into_buffer(scratch_buffer, pkt, pktlen, dname,
rr_type, rr_class, rr_ttl, rr_data, rr_rdlen)) {
log_err("could not decompress RR");
return 0;
}
rr = sldns_buffer_begin(scratch_buffer);
rr_len = sldns_buffer_limit(scratch_buffer);
dname_len = dname_valid(rr, rr_len);
return az_remove_rr(z, rr, rr_len, dname_len, nonexist);
}
/**
* Parse zonefile
* @param z: zone to read in.
* @param in: file to read from (just opened).
* @param rr: buffer to use for RRs, 64k.
* passed so that recursive includes can use the same buffer and do
* not grow the stack too much.
* @param rrbuflen: sizeof rr buffer.
* @param state: parse state with $ORIGIN, $TTL and 'prev-dname' and so on,
* that is kept between includes.
* The lineno is set at 1 and then increased by the function.
* @param fname: file name.
* @param depth: recursion depth for includes
* @param cfg: config for chroot.
* returns false on failure, has printed an error message
*/
static int
az_parse_file(struct auth_zone* z, FILE* in, uint8_t* rr, size_t rrbuflen,
struct sldns_file_parse_state* state, char* fname, int depth,
struct config_file* cfg)
{
size_t rr_len, dname_len;
int status;
state->lineno = 1;
while(!feof(in)) {
rr_len = rrbuflen;
dname_len = 0;
status = sldns_fp2wire_rr_buf(in, rr, &rr_len, &dname_len,
state);
if(status == LDNS_WIREPARSE_ERR_INCLUDE && rr_len == 0) {
/* we have $INCLUDE or $something */
if(strncmp((char*)rr, "$INCLUDE ", 9) == 0 ||
strncmp((char*)rr, "$INCLUDE\t", 9) == 0) {
FILE* inc;
int lineno_orig = state->lineno;
char* incfile = (char*)rr + 8;
if(depth > MAX_INCLUDE_DEPTH) {
log_err("%s:%d max include depth"
"exceeded", fname, state->lineno);
return 0;
}
/* skip spaces */
while(*incfile == ' ' || *incfile == '\t')
incfile++;
/* adjust for chroot on include file */
if(cfg->chrootdir && cfg->chrootdir[0] &&
strncmp(incfile, cfg->chrootdir,
strlen(cfg->chrootdir)) == 0)
incfile += strlen(cfg->chrootdir);
incfile = strdup(incfile);
if(!incfile) {
log_err("malloc failure");
return 0;
}
verbose(VERB_ALGO, "opening $INCLUDE %s",
incfile);
inc = fopen(incfile, "r");
if(!inc) {
log_err("%s:%d cannot open include "
"file %s: %s", fname,
lineno_orig, incfile,
strerror(errno));
free(incfile);
return 0;
}
/* recurse read that file now */
if(!az_parse_file(z, inc, rr, rrbuflen,
state, incfile, depth+1, cfg)) {
log_err("%s:%d cannot parse include "
"file %s", fname,
lineno_orig, incfile);
fclose(inc);
free(incfile);
return 0;
}
fclose(inc);
verbose(VERB_ALGO, "done with $INCLUDE %s",
incfile);
free(incfile);
state->lineno = lineno_orig;
}
continue;
}
if(status != 0) {
log_err("parse error %s %d:%d: %s", fname,
state->lineno, LDNS_WIREPARSE_OFFSET(status),
sldns_get_errorstr_parse(status));
return 0;
}
if(rr_len == 0) {
/* EMPTY line, TTL or ORIGIN */
continue;
}
/* insert wirerr in rrbuf */
if(!az_insert_rr(z, rr, rr_len, dname_len, NULL)) {
char buf[17];
sldns_wire2str_type_buf(sldns_wirerr_get_type(rr,
rr_len, dname_len), buf, sizeof(buf));
log_err("%s:%d cannot insert RR of type %s",
fname, state->lineno, buf);
return 0;
}
}
return 1;
}
int
auth_zone_read_zonefile(struct auth_zone* z, struct config_file* cfg)
{
uint8_t rr[LDNS_RR_BUF_SIZE];
struct sldns_file_parse_state state;
char* zfilename;
FILE* in;
if(!z || !z->zonefile || z->zonefile[0]==0)
return 1; /* no file, or "", nothing to read */
zfilename = z->zonefile;
if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename,
cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
zfilename += strlen(cfg->chrootdir);
if(verbosity >= VERB_ALGO) {
char nm[255+1];
dname_str(z->name, nm);
verbose(VERB_ALGO, "read zonefile %s for %s", zfilename, nm);
}
in = fopen(zfilename, "r");
if(!in) {
char* n = sldns_wire2str_dname(z->name, z->namelen);
if(z->zone_is_slave && errno == ENOENT) {
/* we fetch the zone contents later, no file yet */
verbose(VERB_ALGO, "no zonefile %s for %s",
zfilename, n?n:"error");
free(n);
return 1;
}
log_err("cannot open zonefile %s for %s: %s",
zfilename, n?n:"error", strerror(errno));
free(n);
return 0;
}
/* clear the data tree */
traverse_postorder(&z->data, auth_data_del, NULL);
rbtree_init(&z->data, &auth_data_cmp);
/* clear the RPZ policies */
if(z->rpz)
rpz_clear(z->rpz);
memset(&state, 0, sizeof(state));
/* default TTL to 3600 */
state.default_ttl = 3600;
/* set $ORIGIN to the zone name */
if(z->namelen <= sizeof(state.origin)) {
memcpy(state.origin, z->name, z->namelen);
state.origin_len = z->namelen;
}
/* parse the (toplevel) file */
if(!az_parse_file(z, in, rr, sizeof(rr), &state, zfilename, 0, cfg)) {
char* n = sldns_wire2str_dname(z->name, z->namelen);
log_err("error parsing zonefile %s for %s",
zfilename, n?n:"error");
free(n);
fclose(in);
return 0;
}
fclose(in);
if(z->rpz)
rpz_finish_config(z->rpz);
return 1;
}
/** write buffer to file and check return codes */
static int
write_out(FILE* out, const char* str, size_t len)
{
size_t r;
if(len == 0)
return 1;
r = fwrite(str, 1, len, out);
if(r == 0) {
log_err("write failed: %s", strerror(errno));
return 0;
} else if(r < len) {
log_err("write failed: too short (disk full?)");
return 0;
}
return 1;
}
/** convert auth rr to string */
static int
auth_rr_to_string(uint8_t* nm, size_t nmlen, uint16_t tp, uint16_t cl,
struct packed_rrset_data* data, size_t i, char* s, size_t buflen)
{
int w = 0;
size_t slen = buflen, datlen;
uint8_t* dat;
if(i >= data->count) tp = LDNS_RR_TYPE_RRSIG;
dat = nm;
datlen = nmlen;
w += sldns_wire2str_dname_scan(&dat, &datlen, &s, &slen, NULL, 0, NULL);
w += sldns_str_print(&s, &slen, "\t");
w += sldns_str_print(&s, &slen, "%lu\t", (unsigned long)data->rr_ttl[i]);
w += sldns_wire2str_class_print(&s, &slen, cl);
w += sldns_str_print(&s, &slen, "\t");
w += sldns_wire2str_type_print(&s, &slen, tp);
w += sldns_str_print(&s, &slen, "\t");
datlen = data->rr_len[i]-2;
dat = data->rr_data[i]+2;
w += sldns_wire2str_rdata_scan(&dat, &datlen, &s, &slen, tp, NULL, 0, NULL);
if(tp == LDNS_RR_TYPE_DNSKEY) {
w += sldns_str_print(&s, &slen, " ;{id = %u}",
sldns_calc_keytag_raw(data->rr_data[i]+2,
data->rr_len[i]-2));
}
w += sldns_str_print(&s, &slen, "\n");
if(w >= (int)buflen) {
log_nametypeclass(NO_VERBOSE, "RR too long to print", nm, tp, cl);
return 0;
}
return 1;
}
/** write rrset to file */
static int
auth_zone_write_rrset(struct auth_zone* z, struct auth_data* node,
struct auth_rrset* r, FILE* out)
{
size_t i, count = r->data->count + r->data->rrsig_count;
char buf[LDNS_RR_BUF_SIZE];
for(i=0; i<count; i++) {
if(!auth_rr_to_string(node->name, node->namelen, r->type,
z->dclass, r->data, i, buf, sizeof(buf))) {
verbose(VERB_ALGO, "failed to rr2str rr %d", (int)i);
continue;
}
if(!write_out(out, buf, strlen(buf)))
return 0;
}
return 1;
}
/** write domain to file */
static int
auth_zone_write_domain(struct auth_zone* z, struct auth_data* n, FILE* out)
{
struct auth_rrset* r;
/* if this is zone apex, write SOA first */
if(z->namelen == n->namelen) {
struct auth_rrset* soa = az_domain_rrset(n, LDNS_RR_TYPE_SOA);
if(soa) {
if(!auth_zone_write_rrset(z, n, soa, out))
return 0;
}
}
/* write all the RRsets for this domain */
for(r = n->rrsets; r; r = r->next) {
if(z->namelen == n->namelen &&
r->type == LDNS_RR_TYPE_SOA)
continue; /* skip SOA here */
if(!auth_zone_write_rrset(z, n, r, out))
return 0;
}
return 1;
}
int auth_zone_write_file(struct auth_zone* z, const char* fname)
{
FILE* out;
struct auth_data* n;
out = fopen(fname, "w");
if(!out) {
log_err("could not open %s: %s", fname, strerror(errno));
return 0;
}
RBTREE_FOR(n, struct auth_data*, &z->data) {
if(!auth_zone_write_domain(z, n, out)) {
log_err("could not write domain to %s", fname);
fclose(out);
return 0;
}
}
fclose(out);
return 1;
}
/** read all auth zones from file (if they have) */
static int
auth_zones_read_zones(struct auth_zones* az, struct config_file* cfg)
{
struct auth_zone* z;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
lock_rw_wrlock(&z->lock);
if(!auth_zone_read_zonefile(z, cfg)) {
lock_rw_unlock(&z->lock);
lock_rw_unlock(&az->lock);
return 0;
}
lock_rw_unlock(&z->lock);
}
lock_rw_unlock(&az->lock);
return 1;
}
/** find serial number of zone or false if none */
int
auth_zone_get_serial(struct auth_zone* z, uint32_t* serial)
{
struct auth_data* apex;
struct auth_rrset* soa;
struct packed_rrset_data* d;
apex = az_find_name(z, z->name, z->namelen);
if(!apex) return 0;
soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
if(!soa || soa->data->count==0)
return 0; /* no RRset or no RRs in rrset */
if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */
d = soa->data;
*serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20));
return 1;
}
/** Find auth_zone SOA and populate the values in xfr(soa values). */
static int
xfr_find_soa(struct auth_zone* z, struct auth_xfer* xfr)
{
struct auth_data* apex;
struct auth_rrset* soa;
struct packed_rrset_data* d;
apex = az_find_name(z, z->name, z->namelen);
if(!apex) return 0;
soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
if(!soa || soa->data->count==0)
return 0; /* no RRset or no RRs in rrset */
if(soa->data->rr_len[0] < 2+4*5) return 0; /* SOA too short */
/* SOA record ends with serial, refresh, retry, expiry, minimum,
* as 4 byte fields */
d = soa->data;
xfr->have_zone = 1;
xfr->serial = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-20));
xfr->refresh = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-16));
xfr->retry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-12));
xfr->expiry = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-8));
/* soa minimum at d->rr_len[0]-4 */
return 1;
}
/**
* Setup auth_xfer zone
* This populates the have_zone, soa values, and so on times.
* Doesn't do network traffic yet, can set option flags.
* @param z: locked by caller, and modified for setup
* @param x: locked by caller, and modified.
* @return false on failure.
*/
static int
auth_xfer_setup(struct auth_zone* z, struct auth_xfer* x)
{
/* for a zone without zone transfers, x==NULL, so skip them,
* i.e. the zone config is fixed with no masters or urls */
if(!z || !x) return 1;
if(!xfr_find_soa(z, x)) {
return 1;
}
/* nothing for probe, nextprobe and transfer tasks */
return 1;
}
/**
* Setup all zones
* @param az: auth zones structure
* @return false on failure.
*/
static int
auth_zones_setup_zones(struct auth_zones* az)
{
struct auth_zone* z;
struct auth_xfer* x;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
lock_rw_wrlock(&z->lock);
x = auth_xfer_find(az, z->name, z->namelen, z->dclass);
if(x) {
lock_basic_lock(&x->lock);
}
if(!auth_xfer_setup(z, x)) {
if(x) {
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&z->lock);
lock_rw_unlock(&az->lock);
return 0;
}
if(x) {
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&z->lock);
}
lock_rw_unlock(&az->lock);
return 1;
}
/** set config items and create zones */
static int
auth_zones_cfg(struct auth_zones* az, struct config_auth* c)
{
struct auth_zone* z;
struct auth_xfer* x = NULL;
/* create zone */
if(c->isrpz) {
/* if the rpz lock is needed, grab it before the other
* locks to avoid a lock dependency cycle */
lock_rw_wrlock(&az->rpz_lock);
}
lock_rw_wrlock(&az->lock);
if(!(z=auth_zones_find_or_add_zone(az, c->name))) {
lock_rw_unlock(&az->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
if(c->masters || c->urls) {
if(!(x=auth_zones_find_or_add_xfer(az, z))) {
lock_rw_unlock(&az->lock);
lock_rw_unlock(&z->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
}
if(c->for_downstream)
az->have_downstream = 1;
lock_rw_unlock(&az->lock);
/* set options */
z->zone_deleted = 0;
if(!auth_zone_set_zonefile(z, c->zonefile)) {
if(x) {
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&z->lock);
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
return 0;
}
z->for_downstream = c->for_downstream;
z->for_upstream = c->for_upstream;
z->fallback_enabled = c->fallback_enabled;
if(c->isrpz && !z->rpz){
if(!(z->rpz = rpz_create(c))){
fatal_exit("Could not setup RPZ zones");
return 0;
}
lock_protect(&z->lock, &z->rpz->local_zones, sizeof(*z->rpz));
/* the az->rpz_lock is locked above */
z->rpz_az_next = az->rpz_first;
if(az->rpz_first)
az->rpz_first->rpz_az_prev = z;
az->rpz_first = z;
}
if(c->isrpz) {
lock_rw_unlock(&az->rpz_lock);
}
/* xfer zone */
if(x) {
z->zone_is_slave = 1;
/* set options on xfer zone */
if(!xfer_set_masters(&x->task_probe->masters, c, 0)) {
lock_basic_unlock(&x->lock);
lock_rw_unlock(&z->lock);
return 0;
}
if(!xfer_set_masters(&x->task_transfer->masters, c, 1)) {
lock_basic_unlock(&x->lock);
lock_rw_unlock(&z->lock);
return 0;
}
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&z->lock);
return 1;
}
/** set all auth zones deleted, then in auth_zones_cfg, it marks them
* as nondeleted (if they are still in the config), and then later
* we can find deleted zones */
static void
az_setall_deleted(struct auth_zones* az)
{
struct auth_zone* z;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
lock_rw_wrlock(&z->lock);
z->zone_deleted = 1;
lock_rw_unlock(&z->lock);
}
lock_rw_unlock(&az->lock);
}
/** find zones that are marked deleted and delete them.
* This is called from apply_cfg, and there are no threads and no
* workers, so the xfr can just be deleted. */
static void
az_delete_deleted_zones(struct auth_zones* az)
{
struct auth_zone* z;
struct auth_zone* delete_list = NULL, *next;
struct auth_xfer* xfr;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(z, struct auth_zone*, &az->ztree) {
lock_rw_wrlock(&z->lock);
if(z->zone_deleted) {
/* we cannot alter the rbtree right now, but
* we can put it on a linked list and then
* delete it */
z->delete_next = delete_list;
delete_list = z;
}
lock_rw_unlock(&z->lock);
}
/* now we are out of the tree loop and we can loop and delete
* the zones */
z = delete_list;
while(z) {
next = z->delete_next;
xfr = auth_xfer_find(az, z->name, z->namelen, z->dclass);
if(xfr) {
(void)rbtree_delete(&az->xtree, &xfr->node);
auth_xfer_delete(xfr);
}
(void)rbtree_delete(&az->ztree, &z->node);
auth_zone_delete(z, az);
z = next;
}
lock_rw_unlock(&az->lock);
}
int auth_zones_apply_cfg(struct auth_zones* az, struct config_file* cfg,
int setup, int* is_rpz)
{
struct config_auth* p;
az_setall_deleted(az);
for(p = cfg->auths; p; p = p->next) {
if(!p->name || p->name[0] == 0) {
log_warn("auth-zone without a name, skipped");
continue;
}
*is_rpz = (*is_rpz || p->isrpz);
if(!auth_zones_cfg(az, p)) {
log_err("cannot config auth zone %s", p->name);
return 0;
}
}
az_delete_deleted_zones(az);
if(!auth_zones_read_zones(az, cfg))
return 0;
if(setup) {
if(!auth_zones_setup_zones(az))
return 0;
}
return 1;
}
/** delete chunks
* @param at: transfer structure with chunks list. The chunks and their
* data are freed.
*/
static void
auth_chunks_delete(struct auth_transfer* at)
{
if(at->chunks_first) {
struct auth_chunk* c, *cn;
c = at->chunks_first;
while(c) {
cn = c->next;
free(c->data);
free(c);
c = cn;
}
}
at->chunks_first = NULL;
at->chunks_last = NULL;
}
/** free master addr list */
static void
auth_free_master_addrs(struct auth_addr* list)
{
struct auth_addr *n;
while(list) {
n = list->next;
free(list);
list = n;
}
}
/** free the masters list */
static void
auth_free_masters(struct auth_master* list)
{
struct auth_master* n;
while(list) {
n = list->next;
auth_free_master_addrs(list->list);
free(list->host);
free(list->file);
free(list);
list = n;
}
}
/** delete auth xfer structure
* @param xfr: delete this xfer and its tasks.
*/
static void
auth_xfer_delete(struct auth_xfer* xfr)
{
if(!xfr) return;
lock_basic_destroy(&xfr->lock);
free(xfr->name);
if(xfr->task_nextprobe) {
comm_timer_delete(xfr->task_nextprobe->timer);
free(xfr->task_nextprobe);
}
if(xfr->task_probe) {
auth_free_masters(xfr->task_probe->masters);
comm_point_delete(xfr->task_probe->cp);
comm_timer_delete(xfr->task_probe->timer);
free(xfr->task_probe);
}
if(xfr->task_transfer) {
auth_free_masters(xfr->task_transfer->masters);
comm_point_delete(xfr->task_transfer->cp);
comm_timer_delete(xfr->task_transfer->timer);
if(xfr->task_transfer->chunks_first) {
auth_chunks_delete(xfr->task_transfer);
}
free(xfr->task_transfer);
}
auth_free_masters(xfr->allow_notify_list);
free(xfr);
}
/** helper traverse to delete zones */
static void
auth_zone_del(rbnode_type* n, void* ATTR_UNUSED(arg))
{
struct auth_zone* z = (struct auth_zone*)n->key;
auth_zone_delete(z, NULL);
}
/** helper traverse to delete xfer zones */
static void
auth_xfer_del(rbnode_type* n, void* ATTR_UNUSED(arg))
{
struct auth_xfer* z = (struct auth_xfer*)n->key;
auth_xfer_delete(z);
}
void auth_zones_delete(struct auth_zones* az)
{
if(!az) return;
lock_rw_destroy(&az->lock);
lock_rw_destroy(&az->rpz_lock);
traverse_postorder(&az->ztree, auth_zone_del, NULL);
traverse_postorder(&az->xtree, auth_xfer_del, NULL);
free(az);
}
/** true if domain has only nsec3 */
static int
domain_has_only_nsec3(struct auth_data* n)
{
struct auth_rrset* rrset = n->rrsets;
int nsec3_seen = 0;
while(rrset) {
if(rrset->type == LDNS_RR_TYPE_NSEC3) {
nsec3_seen = 1;
} else if(rrset->type != LDNS_RR_TYPE_RRSIG) {
return 0;
}
rrset = rrset->next;
}
return nsec3_seen;
}
/** see if the domain has a wildcard child '*.domain' */
static struct auth_data*
az_find_wildcard_domain(struct auth_zone* z, uint8_t* nm, size_t nmlen)
{
uint8_t wc[LDNS_MAX_DOMAINLEN];
if(nmlen+2 > sizeof(wc))
return NULL; /* result would be too long */
wc[0] = 1; /* length of wildcard label */
wc[1] = (uint8_t)'*'; /* wildcard label */
memmove(wc+2, nm, nmlen);
return az_find_name(z, wc, nmlen+2);
}
/** find wildcard between qname and cename */
static struct auth_data*
az_find_wildcard(struct auth_zone* z, struct query_info* qinfo,
struct auth_data* ce)
{
uint8_t* nm = qinfo->qname;
size_t nmlen = qinfo->qname_len;
struct auth_data* node;
if(!dname_subdomain_c(nm, z->name))
return NULL; /* out of zone */
while((node=az_find_wildcard_domain(z, nm, nmlen))==NULL) {
/* see if we can go up to find the wildcard */
if(nmlen == z->namelen)
return NULL; /* top of zone reached */
if(ce && nmlen == ce->namelen)
return NULL; /* ce reached */
if(dname_is_root(nm))
return NULL; /* cannot go up */
dname_remove_label(&nm, &nmlen);
}
return node;
}
/** domain is not exact, find first candidate ce (name that matches
* a part of qname) in tree */
static struct auth_data*
az_find_candidate_ce(struct auth_zone* z, struct query_info* qinfo,
struct auth_data* n)
{
uint8_t* nm;
size_t nmlen;
if(n) {
nm = dname_get_shared_topdomain(qinfo->qname, n->name);
} else {
nm = qinfo->qname;
}
dname_count_size_labels(nm, &nmlen);
n = az_find_name(z, nm, nmlen);
/* delete labels and go up on name */
while(!n) {
if(dname_is_root(nm))
return NULL; /* cannot go up */
dname_remove_label(&nm, &nmlen);
n = az_find_name(z, nm, nmlen);
}
return n;
}
/** go up the auth tree to next existing name. */
static struct auth_data*
az_domain_go_up(struct auth_zone* z, struct auth_data* n)
{
uint8_t* nm = n->name;
size_t nmlen = n->namelen;
while(!dname_is_root(nm)) {
dname_remove_label(&nm, &nmlen);
if((n=az_find_name(z, nm, nmlen)) != NULL)
return n;
}
return NULL;
}
/** Find the closest encloser, an name that exists and is above the
* qname.
* return true if the node (param node) is existing, nonobscured and
* can be used to generate answers from. It is then also node_exact.
* returns false if the node is not good enough (or it wasn't node_exact)
* in this case the ce can be filled.
* if ce is NULL, no ce exists, and likely the zone is completely empty,
* not even with a zone apex.
* if ce is nonNULL it is the closest enclosing upper name (that exists
* itself for answer purposes). That name may have DNAME, NS or wildcard
* rrset is the closest DNAME or NS rrset that was found.
*/
static int
az_find_ce(struct auth_zone* z, struct query_info* qinfo,
struct auth_data* node, int node_exact, struct auth_data** ce,
struct auth_rrset** rrset)
{
struct auth_data* n = node;
*ce = NULL;
*rrset = NULL;
if(!node_exact) {
/* if not exact, lookup closest exact match */
n = az_find_candidate_ce(z, qinfo, n);
} else {
/* if exact, the node itself is the first candidate ce */
*ce = n;
}
/* no direct answer from nsec3-only domains */
if(n && domain_has_only_nsec3(n)) {
node_exact = 0;
*ce = NULL;
}
/* with exact matches, walk up the labels until we find the
* delegation, or DNAME or zone end */
while(n) {
/* see if the current candidate has issues */
/* not zone apex and has type NS */
if(n->namelen != z->namelen &&
(*rrset=az_domain_rrset(n, LDNS_RR_TYPE_NS)) &&
/* delegate here, but DS at exact the dp has notype */
(qinfo->qtype != LDNS_RR_TYPE_DS ||
n->namelen != qinfo->qname_len)) {
/* referral */
/* this is ce and the lowernode is nonexisting */
*ce = n;
return 0;
}
/* not equal to qname and has type DNAME */
if(n->namelen != qinfo->qname_len &&
(*rrset=az_domain_rrset(n, LDNS_RR_TYPE_DNAME))) {
/* this is ce and the lowernode is nonexisting */
*ce = n;
return 0;
}
if(*ce == NULL && !domain_has_only_nsec3(n)) {
/* if not found yet, this exact name must be
* our lowest match (but not nsec3onlydomain) */
*ce = n;
}
/* walk up the tree by removing labels from name and lookup */
n = az_domain_go_up(z, n);
}
/* found no problems, if it was an exact node, it is fine to use */
return node_exact;
}
/** add additional A/AAAA from domain names in rrset rdata (+offset)
* offset is number of bytes in rdata where the dname is located. */
static int
az_add_additionals_from(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_rrset* rrset, size_t offset)
{
struct packed_rrset_data* d = rrset->data;
size_t i;
if(!d) return 0;
for(i=0; i<d->count; i++) {
size_t dlen;
struct auth_data* domain;
struct auth_rrset* ref;
if(d->rr_len[i] < 2+offset)
continue; /* too short */
if(!(dlen = dname_valid(d->rr_data[i]+2+offset,
d->rr_len[i]-2-offset)))
continue; /* malformed */
domain = az_find_name(z, d->rr_data[i]+2+offset, dlen);
if(!domain)
continue;
if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_A)) != NULL) {
if(!msg_add_rrset_ar(z, region, msg, domain, ref))
return 0;
}
if((ref=az_domain_rrset(domain, LDNS_RR_TYPE_AAAA)) != NULL) {
if(!msg_add_rrset_ar(z, region, msg, domain, ref))
return 0;
}
}
return 1;
}
/** add negative SOA record (with negative TTL) */
static int
az_add_negative_soa(struct auth_zone* z, struct regional* region,
struct dns_msg* msg)
{
uint32_t minimum;
struct packed_rrset_data* d;
struct auth_rrset* soa;
struct auth_data* apex = az_find_name(z, z->name, z->namelen);
if(!apex) return 0;
soa = az_domain_rrset(apex, LDNS_RR_TYPE_SOA);
if(!soa) return 0;
/* must be first to put in message; we want to fix the TTL with
* one RRset here, otherwise we'd need to loop over the RRs to get
* the resulting lower TTL */
log_assert(msg->rep->rrset_count == 0);
if(!msg_add_rrset_ns(z, region, msg, apex, soa)) return 0;
/* fixup TTL */
d = (struct packed_rrset_data*)msg->rep->rrsets[msg->rep->rrset_count-1]->entry.data;
/* last 4 bytes are minimum ttl in network format */
if(d->count == 0) return 0;
if(d->rr_len[0] < 2+4) return 0;
minimum = sldns_read_uint32(d->rr_data[0]+(d->rr_len[0]-4));
d->ttl = (time_t)minimum;
d->rr_ttl[0] = (time_t)minimum;
msg->rep->ttl = get_rrset_ttl(msg->rep->rrsets[0]);
msg->rep->prefetch_ttl = PREFETCH_TTL_CALC(msg->rep->ttl);
msg->rep->serve_expired_ttl = msg->rep->ttl + SERVE_EXPIRED_TTL;
return 1;
}
/** See if the query goes to empty nonterminal (that has no auth_data,
* but there are nodes underneath. We already checked that there are
* not NS, or DNAME above, so that we only need to check if some node
* exists below (with nonempty rr list), return true if emptynonterminal */
static int
az_empty_nonterminal(struct auth_zone* z, struct query_info* qinfo,
struct auth_data* node)
{
struct auth_data* next;
if(!node) {
/* no smaller was found, use first (smallest) node as the
* next one */
next = (struct auth_data*)rbtree_first(&z->data);
} else {
next = (struct auth_data*)rbtree_next(&node->node);
}
while(next && (rbnode_type*)next != RBTREE_NULL && next->rrsets == NULL) {
/* the next name has empty rrsets, is an empty nonterminal
* itself, see if there exists something below it */
next = (struct auth_data*)rbtree_next(&node->node);
}
if((rbnode_type*)next == RBTREE_NULL || !next) {
/* there is no next node, so something below it cannot
* exist */
return 0;
}
/* a next node exists, if there was something below the query,
* this node has to be it. See if it is below the query name */
if(dname_strict_subdomain_c(next->name, qinfo->qname))
return 1;
return 0;
}
/** create synth cname target name in buffer, or fail if too long */
static size_t
synth_cname_buf(uint8_t* qname, size_t qname_len, size_t dname_len,
uint8_t* dtarg, size_t dtarglen, uint8_t* buf, size_t buflen)
{
size_t newlen = qname_len + dtarglen - dname_len;
if(newlen > buflen) {
/* YXDOMAIN error */
return 0;
}
/* new name is concatenation of qname front (without DNAME owner)
* and DNAME target name */
memcpy(buf, qname, qname_len-dname_len);
memmove(buf+(qname_len-dname_len), dtarg, dtarglen);
return newlen;
}
/** create synthetic CNAME rrset for in a DNAME answer in region,
* false on alloc failure, cname==NULL when name too long. */
static int
create_synth_cname(uint8_t* qname, size_t qname_len, struct regional* region,
struct auth_data* node, struct auth_rrset* dname, uint16_t dclass,
struct ub_packed_rrset_key** cname)
{
uint8_t buf[LDNS_MAX_DOMAINLEN];
uint8_t* dtarg;
size_t dtarglen, newlen;
struct packed_rrset_data* d;
/* get DNAME target name */
if(dname->data->count < 1) return 0;
if(dname->data->rr_len[0] < 3) return 0; /* at least rdatalen +1 */
dtarg = dname->data->rr_data[0]+2;
dtarglen = dname->data->rr_len[0]-2;
if(sldns_read_uint16(dname->data->rr_data[0]) != dtarglen)
return 0; /* rdatalen in DNAME rdata is malformed */
if(dname_valid(dtarg, dtarglen) != dtarglen)
return 0; /* DNAME RR has malformed rdata */
if(qname_len == 0)
return 0; /* too short */
if(qname_len <= node->namelen)
return 0; /* qname too short for dname removal */
/* synthesize a CNAME */
newlen = synth_cname_buf(qname, qname_len, node->namelen,
dtarg, dtarglen, buf, sizeof(buf));
if(newlen == 0) {
/* YXDOMAIN error */
*cname = NULL;
return 1;
}
*cname = (struct ub_packed_rrset_key*)regional_alloc(region,
sizeof(struct ub_packed_rrset_key));
if(!*cname)
return 0; /* out of memory */
memset(&(*cname)->entry, 0, sizeof((*cname)->entry));
(*cname)->entry.key = (*cname);
(*cname)->rk.type = htons(LDNS_RR_TYPE_CNAME);
(*cname)->rk.rrset_class = htons(dclass);
(*cname)->rk.flags = 0;
(*cname)->rk.dname = regional_alloc_init(region, qname, qname_len);
if(!(*cname)->rk.dname)
return 0; /* out of memory */
(*cname)->rk.dname_len = qname_len;
(*cname)->entry.hash = rrset_key_hash(&(*cname)->rk);
d = (struct packed_rrset_data*)regional_alloc_zero(region,
sizeof(struct packed_rrset_data) + sizeof(size_t) +
sizeof(uint8_t*) + sizeof(time_t) + sizeof(uint16_t)
+ newlen);
if(!d)
return 0; /* out of memory */
(*cname)->entry.data = d;
d->ttl = 0; /* 0 for synthesized CNAME TTL */
d->count = 1;
d->rrsig_count = 0;
d->trust = rrset_trust_ans_noAA;
d->rr_len = (size_t*)((uint8_t*)d +
sizeof(struct packed_rrset_data));
d->rr_len[0] = newlen + sizeof(uint16_t);
packed_rrset_ptr_fixup(d);
d->rr_ttl[0] = d->ttl;
sldns_write_uint16(d->rr_data[0], newlen);
memmove(d->rr_data[0] + sizeof(uint16_t), buf, newlen);
return 1;
}
/** add a synthesized CNAME to the answer section */
static int
add_synth_cname(struct auth_zone* z, uint8_t* qname, size_t qname_len,
struct regional* region, struct dns_msg* msg, struct auth_data* dname,
struct auth_rrset* rrset)
{
struct ub_packed_rrset_key* cname;
/* synthesize a CNAME */
if(!create_synth_cname(qname, qname_len, region, dname, rrset,
z->dclass, &cname)) {
/* out of memory */
return 0;
}
if(!cname) {
/* cname cannot be create because of YXDOMAIN */
msg->rep->flags |= LDNS_RCODE_YXDOMAIN;
return 1;
}
/* add cname to message */
if(!msg_grow_array(region, msg))
return 0;
msg->rep->rrsets[msg->rep->rrset_count] = cname;
msg->rep->rrset_count++;
msg->rep->an_numrrsets++;
msg_ttl(msg);
return 1;
}
/** Change a dname to a different one, for wildcard namechange */
static void
az_change_dnames(struct dns_msg* msg, uint8_t* oldname, uint8_t* newname,
size_t newlen, int an_only)
{
size_t i;
size_t start = 0, end = msg->rep->rrset_count;
if(!an_only) start = msg->rep->an_numrrsets;
if(an_only) end = msg->rep->an_numrrsets;
for(i=start; i<end; i++) {
/* allocated in region so we can change the ptrs */
if(query_dname_compare(msg->rep->rrsets[i]->rk.dname, oldname)
== 0) {
msg->rep->rrsets[i]->rk.dname = newname;
msg->rep->rrsets[i]->rk.dname_len = newlen;
}
}
}
/** find NSEC record covering the query */
static struct auth_rrset*
az_find_nsec_cover(struct auth_zone* z, struct auth_data** node)
{
uint8_t* nm = (*node)->name;
size_t nmlen = (*node)->namelen;
struct auth_rrset* rrset;
/* find the NSEC for the smallest-or-equal node */
/* if node == NULL, we did not find a smaller name. But the zone
* name is the smallest name and should have an NSEC. So there is
* no NSEC to return (for a properly signed zone) */
/* for empty nonterminals, the auth-data node should not exist,
* and thus we don't need to go rbtree_previous here to find
* a domain with an NSEC record */
/* but there could be glue, and if this is node, then it has no NSEC.
* Go up to find nonglue (previous) NSEC-holding nodes */
while((rrset=az_domain_rrset(*node, LDNS_RR_TYPE_NSEC)) == NULL) {
if(dname_is_root(nm)) return NULL;
if(nmlen == z->namelen) return NULL;
dname_remove_label(&nm, &nmlen);
/* adjust *node for the nsec rrset to find in */
*node = az_find_name(z, nm, nmlen);
}
return rrset;
}
/** Find NSEC and add for wildcard denial */
static int
az_nsec_wildcard_denial(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, uint8_t* cenm, size_t cenmlen)
{
struct query_info qinfo;
int node_exact;
struct auth_data* node;
struct auth_rrset* nsec;
uint8_t wc[LDNS_MAX_DOMAINLEN];
if(cenmlen+2 > sizeof(wc))
return 0; /* result would be too long */
wc[0] = 1; /* length of wildcard label */
wc[1] = (uint8_t)'*'; /* wildcard label */
memmove(wc+2, cenm, cenmlen);
/* we have '*.ce' in wc wildcard name buffer */
/* get nsec cover for that */
qinfo.qname = wc;
qinfo.qname_len = cenmlen+2;
qinfo.qtype = 0;
qinfo.qclass = 0;
az_find_domain(z, &qinfo, &node_exact, &node);
if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
}
return 1;
}
/** Find the NSEC3PARAM rrset (if any) and if true you have the parameters */
static int
az_nsec3_param(struct auth_zone* z, int* algo, size_t* iter, uint8_t** salt,
size_t* saltlen)
{
struct auth_data* apex;
struct auth_rrset* param;
size_t i;
apex = az_find_name(z, z->name, z->namelen);
if(!apex) return 0;
param = az_domain_rrset(apex, LDNS_RR_TYPE_NSEC3PARAM);
if(!param || param->data->count==0)
return 0; /* no RRset or no RRs in rrset */
/* find out which NSEC3PARAM RR has supported parameters */
/* skip unknown flags (dynamic signer is recalculating nsec3 chain) */
for(i=0; i<param->data->count; i++) {
uint8_t* rdata = param->data->rr_data[i]+2;
size_t rdatalen = param->data->rr_len[i];
if(rdatalen < 2+5)
continue; /* too short */
if(!nsec3_hash_algo_size_supported((int)(rdata[0])))
continue; /* unsupported algo */
if(rdatalen < (size_t)(2+5+(size_t)rdata[4]))
continue; /* salt missing */
if((rdata[1]&NSEC3_UNKNOWN_FLAGS)!=0)
continue; /* unknown flags */
*algo = (int)(rdata[0]);
*iter = sldns_read_uint16(rdata+2);
*saltlen = rdata[4];
if(*saltlen == 0)
*salt = NULL;
else *salt = rdata+5;
return 1;
}
/* no supported params */
return 0;
}
/** Hash a name with nsec3param into buffer, it has zone name appended.
* return length of hash */
static size_t
az_nsec3_hash(uint8_t* buf, size_t buflen, uint8_t* nm, size_t nmlen,
int algo, size_t iter, uint8_t* salt, size_t saltlen)
{
size_t hlen = nsec3_hash_algo_size_supported(algo);
/* buffer has domain name, nsec3hash, and 256 is for max saltlen
* (salt has 0-255 length) */
unsigned char p[LDNS_MAX_DOMAINLEN+1+N3HASHBUFLEN+256];
size_t i;
if(nmlen+saltlen > sizeof(p) || hlen+saltlen > sizeof(p))
return 0;
if(hlen > buflen)
return 0; /* somehow too large for destination buffer */
/* hashfunc(name, salt) */
memmove(p, nm, nmlen);
query_dname_tolower(p);
if(salt && saltlen > 0)
memmove(p+nmlen, salt, saltlen);
(void)secalgo_nsec3_hash(algo, p, nmlen+saltlen, (unsigned char*)buf);
for(i=0; i<iter; i++) {
/* hashfunc(hash, salt) */
memmove(p, buf, hlen);
if(salt && saltlen > 0)
memmove(p+hlen, salt, saltlen);
(void)secalgo_nsec3_hash(algo, p, hlen+saltlen,
(unsigned char*)buf);
}
return hlen;
}
/** Hash name and return b32encoded hashname for lookup, zone name appended */
static int
az_nsec3_hashname(struct auth_zone* z, uint8_t* hashname, size_t* hashnmlen,
uint8_t* nm, size_t nmlen, int algo, size_t iter, uint8_t* salt,
size_t saltlen)
{
uint8_t hash[N3HASHBUFLEN];
size_t hlen;
int ret;
hlen = az_nsec3_hash(hash, sizeof(hash), nm, nmlen, algo, iter,
salt, saltlen);
if(!hlen) return 0;
/* b32 encode */
if(*hashnmlen < hlen*2+1+z->namelen) /* approx b32 as hexb16 */
return 0;
ret = sldns_b32_ntop_extended_hex(hash, hlen, (char*)(hashname+1),
(*hashnmlen)-1);
if(ret<1)
return 0;
hashname[0] = (uint8_t)ret;
ret++;
if((*hashnmlen) - ret < z->namelen)
return 0;
memmove(hashname+ret, z->name, z->namelen);
*hashnmlen = z->namelen+(size_t)ret;
return 1;
}
/** Find the datanode that covers the nsec3hash-name */
static struct auth_data*
az_nsec3_findnode(struct auth_zone* z, uint8_t* hashnm, size_t hashnmlen)
{
struct query_info qinfo;
struct auth_data* node;
int node_exact;
qinfo.qclass = 0;
qinfo.qtype = 0;
qinfo.qname = hashnm;
qinfo.qname_len = hashnmlen;
/* because canonical ordering and b32 nsec3 ordering are the same.
* this is a good lookup to find the nsec3 name. */
az_find_domain(z, &qinfo, &node_exact, &node);
/* but we may have to skip non-nsec3 nodes */
/* this may be a lot, the way to speed that up is to have a
* separate nsec3 tree with nsec3 nodes */
while(node && (rbnode_type*)node != RBTREE_NULL &&
!az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) {
node = (struct auth_data*)rbtree_previous(&node->node);
}
if((rbnode_type*)node == RBTREE_NULL)
node = NULL;
return node;
}
/** Find cover for hashed(nm, nmlen) (or NULL) */
static struct auth_data*
az_nsec3_find_cover(struct auth_zone* z, uint8_t* nm, size_t nmlen,
int algo, size_t iter, uint8_t* salt, size_t saltlen)
{
struct auth_data* node;
uint8_t hname[LDNS_MAX_DOMAINLEN];
size_t hlen = sizeof(hname);
if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter,
salt, saltlen))
return NULL;
node = az_nsec3_findnode(z, hname, hlen);
if(node)
return node;
/* we did not find any, perhaps because the NSEC3 hash is before
* the first hash, we have to find the 'last hash' in the zone */
node = (struct auth_data*)rbtree_last(&z->data);
while(node && (rbnode_type*)node != RBTREE_NULL &&
!az_domain_rrset(node, LDNS_RR_TYPE_NSEC3)) {
node = (struct auth_data*)rbtree_previous(&node->node);
}
if((rbnode_type*)node == RBTREE_NULL)
node = NULL;
return node;
}
/** Find exact match for hashed(nm, nmlen) NSEC3 record or NULL */
static struct auth_data*
az_nsec3_find_exact(struct auth_zone* z, uint8_t* nm, size_t nmlen,
int algo, size_t iter, uint8_t* salt, size_t saltlen)
{
struct auth_data* node;
uint8_t hname[LDNS_MAX_DOMAINLEN];
size_t hlen = sizeof(hname);
if(!az_nsec3_hashname(z, hname, &hlen, nm, nmlen, algo, iter,
salt, saltlen))
return NULL;
node = az_find_name(z, hname, hlen);
if(az_domain_rrset(node, LDNS_RR_TYPE_NSEC3))
return node;
return NULL;
}
/** Return nextcloser name (as a ref into the qname). This is one label
* more than the cenm (cename must be a suffix of qname) */
static void
az_nsec3_get_nextcloser(uint8_t* cenm, uint8_t* qname, size_t qname_len,
uint8_t** nx, size_t* nxlen)
{
int celabs = dname_count_labels(cenm);
int qlabs = dname_count_labels(qname);
int strip = qlabs - celabs -1;
log_assert(dname_strict_subdomain(qname, qlabs, cenm, celabs));
*nx = qname;
*nxlen = qname_len;
if(strip>0)
dname_remove_labels(nx, nxlen, strip);
}
/** Find the closest encloser that has exact NSEC3.
* updated cenm to the new name. If it went up no-exact-ce is true. */
static struct auth_data*
az_nsec3_find_ce(struct auth_zone* z, uint8_t** cenm, size_t* cenmlen,
int* no_exact_ce, int algo, size_t iter, uint8_t* salt, size_t saltlen)
{
struct auth_data* node;
while((node = az_nsec3_find_exact(z, *cenm, *cenmlen,
algo, iter, salt, saltlen)) == NULL) {
if(*cenmlen == z->namelen) {
/* next step up would take us out of the zone. fail */
return NULL;
}
*no_exact_ce = 1;
dname_remove_label(cenm, cenmlen);
}
return node;
}
/* Insert NSEC3 record in authority section, if NULL does nothing */
static int
az_nsec3_insert(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node)
{
struct auth_rrset* nsec3;
if(!node) return 1; /* no node, skip this */
nsec3 = az_domain_rrset(node, LDNS_RR_TYPE_NSEC3);
if(!nsec3) return 1; /* if no nsec3 RR, skip it */
if(!msg_add_rrset_ns(z, region, msg, node, nsec3)) return 0;
return 1;
}
/** add NSEC3 records to the zone for the nsec3 proof.
* Specify with the flags with parts of the proof are required.
* the ce is the exact matching name (for notype) but also delegation points.
* qname is the one where the nextcloser name can be derived from.
* If NSEC3 is not properly there (in the zone) nothing is added.
* always enabled: include nsec3 proving about the Closest Encloser.
* that is an exact match that should exist for it.
* If that does not exist, a higher exact match + nxproof is enabled
* (for some sort of opt-out empty nonterminal cases).
* nodataproof: search for exact match and include that instead.
* ceproof: include ce proof NSEC3 (omitted for wildcard replies).
* nxproof: include denial of the qname.
* wcproof: include denial of wildcard (wildcard.ce).
*/
static int
az_add_nsec3_proof(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, uint8_t* cenm, size_t cenmlen, uint8_t* qname,
size_t qname_len, int nodataproof, int ceproof, int nxproof,
int wcproof)
{
int algo;
size_t iter, saltlen;
uint8_t* salt;
int no_exact_ce = 0;
struct auth_data* node;
/* find parameters of nsec3 proof */
if(!az_nsec3_param(z, &algo, &iter, &salt, &saltlen))
return 1; /* no nsec3 */
if(nodataproof) {
/* see if the node has a hash of itself for the nodata
* proof nsec3, this has to be an exact match nsec3. */
struct auth_data* match;
match = az_nsec3_find_exact(z, qname, qname_len, algo,
iter, salt, saltlen);
if(match) {
if(!az_nsec3_insert(z, region, msg, match))
return 0;
/* only nodata NSEC3 needed, no CE or others. */
return 1;
}
}
/* find ce that has an NSEC3 */
if(ceproof) {
node = az_nsec3_find_ce(z, &cenm, &cenmlen, &no_exact_ce,
algo, iter, salt, saltlen);
if(no_exact_ce) nxproof = 1;
if(!az_nsec3_insert(z, region, msg, node))
return 0;
}
if(nxproof) {
uint8_t* nx;
size_t nxlen;
/* create nextcloser domain name */
az_nsec3_get_nextcloser(cenm, qname, qname_len, &nx, &nxlen);
/* find nsec3 that matches or covers it */
node = az_nsec3_find_cover(z, nx, nxlen, algo, iter, salt,
saltlen);
if(!az_nsec3_insert(z, region, msg, node))
return 0;
}
if(wcproof) {
/* create wildcard name *.ce */
uint8_t wc[LDNS_MAX_DOMAINLEN];
size_t wclen;
if(cenmlen+2 > sizeof(wc))
return 0; /* result would be too long */
wc[0] = 1; /* length of wildcard label */
wc[1] = (uint8_t)'*'; /* wildcard label */
memmove(wc+2, cenm, cenmlen);
wclen = cenmlen+2;
/* find nsec3 that matches or covers it */
node = az_nsec3_find_cover(z, wc, wclen, algo, iter, salt,
saltlen);
if(!az_nsec3_insert(z, region, msg, node))
return 0;
}
return 1;
}
/** generate answer for positive answer */
static int
az_generate_positive_answer(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node, struct auth_rrset* rrset)
{
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
/* see if we want additional rrs */
if(rrset->type == LDNS_RR_TYPE_MX) {
if(!az_add_additionals_from(z, region, msg, rrset, 2))
return 0;
} else if(rrset->type == LDNS_RR_TYPE_SRV) {
if(!az_add_additionals_from(z, region, msg, rrset, 6))
return 0;
} else if(rrset->type == LDNS_RR_TYPE_NS) {
if(!az_add_additionals_from(z, region, msg, rrset, 0))
return 0;
}
return 1;
}
/** generate answer for type ANY answer */
static int
az_generate_any_answer(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node)
{
struct auth_rrset* rrset;
int added = 0;
/* add a couple (at least one) RRs */
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_SOA)) != NULL) {
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
added++;
}
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_MX)) != NULL) {
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
added++;
}
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_A)) != NULL) {
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
added++;
}
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_AAAA)) != NULL) {
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
added++;
}
if(added == 0 && node && node->rrsets) {
if(!msg_add_rrset_an(z, region, msg, node,
node->rrsets)) return 0;
}
return 1;
}
/** follow cname chain and add more data to the answer section */
static int
follow_cname_chain(struct auth_zone* z, uint16_t qtype,
struct regional* region, struct dns_msg* msg,
struct packed_rrset_data* d)
{
int maxchain = 0;
/* see if we can add the target of the CNAME into the answer */
while(maxchain++ < MAX_CNAME_CHAIN) {
struct auth_data* node;
struct auth_rrset* rrset;
size_t clen;
/* d has cname rdata */
if(d->count == 0) break; /* no CNAME */
if(d->rr_len[0] < 2+1) break; /* too small */
if((clen=dname_valid(d->rr_data[0]+2, d->rr_len[0]-2))==0)
break; /* malformed */
if(!dname_subdomain_c(d->rr_data[0]+2, z->name))
break; /* target out of zone */
if((node = az_find_name(z, d->rr_data[0]+2, clen))==NULL)
break; /* no such target name */
if((rrset=az_domain_rrset(node, qtype))!=NULL) {
/* done we found the target */
if(!msg_add_rrset_an(z, region, msg, node, rrset))
return 0;
break;
}
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME))==NULL)
break; /* no further CNAME chain, notype */
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
d = rrset->data;
}
return 1;
}
/** generate answer for cname answer */
static int
az_generate_cname_answer(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg* msg,
struct auth_data* node, struct auth_rrset* rrset)
{
if(!msg_add_rrset_an(z, region, msg, node, rrset)) return 0;
if(!rrset) return 1;
if(!follow_cname_chain(z, qinfo->qtype, region, msg, rrset->data))
return 0;
return 1;
}
/** generate answer for notype answer */
static int
az_generate_notype_answer(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* node)
{
struct auth_rrset* rrset;
if(!az_add_negative_soa(z, region, msg)) return 0;
/* DNSSEC denial NSEC */
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_NSEC))!=NULL) {
if(!msg_add_rrset_ns(z, region, msg, node, rrset)) return 0;
} else if(node) {
/* DNSSEC denial NSEC3 */
if(!az_add_nsec3_proof(z, region, msg, node->name,
node->namelen, msg->qinfo.qname,
msg->qinfo.qname_len, 1, 1, 0, 0))
return 0;
}
return 1;
}
/** generate answer for referral answer */
static int
az_generate_referral_answer(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* ce, struct auth_rrset* rrset)
{
struct auth_rrset* ds, *nsec;
/* turn off AA flag, referral is nonAA because it leaves the zone */
log_assert(ce);
msg->rep->flags &= ~BIT_AA;
if(!msg_add_rrset_ns(z, region, msg, ce, rrset)) return 0;
/* add DS or deny it */
if((ds=az_domain_rrset(ce, LDNS_RR_TYPE_DS))!=NULL) {
if(!msg_add_rrset_ns(z, region, msg, ce, ds)) return 0;
} else {
/* deny the DS */
if((nsec=az_domain_rrset(ce, LDNS_RR_TYPE_NSEC))!=NULL) {
if(!msg_add_rrset_ns(z, region, msg, ce, nsec))
return 0;
} else {
if(!az_add_nsec3_proof(z, region, msg, ce->name,
ce->namelen, msg->qinfo.qname,
msg->qinfo.qname_len, 1, 1, 0, 0))
return 0;
}
}
/* add additional rrs for type NS */
if(!az_add_additionals_from(z, region, msg, rrset, 0)) return 0;
return 1;
}
/** generate answer for DNAME answer */
static int
az_generate_dname_answer(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg* msg, struct auth_data* ce,
struct auth_rrset* rrset)
{
log_assert(ce);
/* add the DNAME and then a CNAME */
if(!msg_add_rrset_an(z, region, msg, ce, rrset)) return 0;
if(!add_synth_cname(z, qinfo->qname, qinfo->qname_len, region,
msg, ce, rrset)) return 0;
if(FLAGS_GET_RCODE(msg->rep->flags) == LDNS_RCODE_YXDOMAIN)
return 1;
if(msg->rep->rrset_count == 0 ||
!msg->rep->rrsets[msg->rep->rrset_count-1])
return 0;
if(!follow_cname_chain(z, qinfo->qtype, region, msg,
(struct packed_rrset_data*)msg->rep->rrsets[
msg->rep->rrset_count-1]->entry.data))
return 0;
return 1;
}
/** generate answer for wildcard answer */
static int
az_generate_wildcard_answer(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg* msg, struct auth_data* ce,
struct auth_data* wildcard, struct auth_data* node)
{
struct auth_rrset* rrset, *nsec;
int insert_ce = 0;
if((rrset=az_domain_rrset(wildcard, qinfo->qtype)) != NULL) {
/* wildcard has type, add it */
if(!msg_add_rrset_an(z, region, msg, wildcard, rrset))
return 0;
az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
msg->qinfo.qname_len, 1);
} else if((rrset=az_domain_rrset(wildcard, LDNS_RR_TYPE_CNAME))!=NULL) {
/* wildcard has cname instead, do that */
if(!msg_add_rrset_an(z, region, msg, wildcard, rrset))
return 0;
az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
msg->qinfo.qname_len, 1);
if(!follow_cname_chain(z, qinfo->qtype, region, msg,
rrset->data))
return 0;
} else if(qinfo->qtype == LDNS_RR_TYPE_ANY && wildcard->rrsets) {
/* add ANY rrsets from wildcard node */
if(!az_generate_any_answer(z, region, msg, wildcard))
return 0;
az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
msg->qinfo.qname_len, 1);
} else {
/* wildcard has nodata, notype answer */
/* call other notype routine for dnssec notype denials */
if(!az_generate_notype_answer(z, region, msg, wildcard))
return 0;
/* because the notype, there is no positive data with an
* RRSIG that indicates the wildcard position. Thus the
* wildcard qname denial needs to have a CE nsec3. */
insert_ce = 1;
}
/* ce and node for dnssec denial of wildcard original name */
if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
} else if(ce) {
uint8_t* wildup = wildcard->name;
size_t wilduplen= wildcard->namelen;
dname_remove_label(&wildup, &wilduplen);
if(!az_add_nsec3_proof(z, region, msg, wildup,
wilduplen, msg->qinfo.qname,
msg->qinfo.qname_len, 0, insert_ce, 1, 0))
return 0;
}
/* fixup name of wildcard from *.zone to qname, use already allocated
* pointer to msg qname */
az_change_dnames(msg, wildcard->name, msg->qinfo.qname,
msg->qinfo.qname_len, 0);
return 1;
}
/** generate answer for nxdomain answer */
static int
az_generate_nxdomain_answer(struct auth_zone* z, struct regional* region,
struct dns_msg* msg, struct auth_data* ce, struct auth_data* node)
{
struct auth_rrset* nsec;
msg->rep->flags |= LDNS_RCODE_NXDOMAIN;
if(!az_add_negative_soa(z, region, msg)) return 0;
if((nsec=az_find_nsec_cover(z, &node)) != NULL) {
if(!msg_add_rrset_ns(z, region, msg, node, nsec)) return 0;
if(ce && !az_nsec_wildcard_denial(z, region, msg, ce->name,
ce->namelen)) return 0;
} else if(ce) {
if(!az_add_nsec3_proof(z, region, msg, ce->name,
ce->namelen, msg->qinfo.qname,
msg->qinfo.qname_len, 0, 1, 1, 1))
return 0;
}
return 1;
}
/** Create answers when an exact match exists for the domain name */
static int
az_generate_answer_with_node(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg* msg, struct auth_data* node)
{
struct auth_rrset* rrset;
/* positive answer, rrset we are looking for exists */
if((rrset=az_domain_rrset(node, qinfo->qtype)) != NULL) {
return az_generate_positive_answer(z, region, msg, node, rrset);
}
/* CNAME? */
if((rrset=az_domain_rrset(node, LDNS_RR_TYPE_CNAME)) != NULL) {
return az_generate_cname_answer(z, qinfo, region, msg,
node, rrset);
}
/* type ANY ? */
if(qinfo->qtype == LDNS_RR_TYPE_ANY) {
return az_generate_any_answer(z, region, msg, node);
}
/* NOERROR/NODATA (no such type at domain name) */
return az_generate_notype_answer(z, region, msg, node);
}
/** Generate answer without an existing-node that we can use.
* So it'll be a referral, DNAME or nxdomain */
static int
az_generate_answer_nonexistnode(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg* msg, struct auth_data* ce,
struct auth_rrset* rrset, struct auth_data* node)
{
struct auth_data* wildcard;
/* we do not have an exact matching name (that exists) */
/* see if we have a NS or DNAME in the ce */
if(ce && rrset && rrset->type == LDNS_RR_TYPE_NS) {
return az_generate_referral_answer(z, region, msg, ce, rrset);
}
if(ce && rrset && rrset->type == LDNS_RR_TYPE_DNAME) {
return az_generate_dname_answer(z, qinfo, region, msg, ce,
rrset);
}
/* if there is an empty nonterminal, wildcard and nxdomain don't
* happen, it is a notype answer */
if(az_empty_nonterminal(z, qinfo, node)) {
return az_generate_notype_answer(z, region, msg, node);
}
/* see if we have a wildcard under the ce */
if((wildcard=az_find_wildcard(z, qinfo, ce)) != NULL) {
return az_generate_wildcard_answer(z, qinfo, region, msg,
ce, wildcard, node);
}
/* generate nxdomain answer */
return az_generate_nxdomain_answer(z, region, msg, ce, node);
}
/** Lookup answer in a zone. */
static int
auth_zone_generate_answer(struct auth_zone* z, struct query_info* qinfo,
struct regional* region, struct dns_msg** msg, int* fallback)
{
struct auth_data* node, *ce;
struct auth_rrset* rrset;
int node_exact, node_exists;
/* does the zone want fallback in case of failure? */
*fallback = z->fallback_enabled;
if(!(*msg=msg_create(region, qinfo))) return 0;
/* lookup if there is a matching domain name for the query */
az_find_domain(z, qinfo, &node_exact, &node);
/* see if node exists for generating answers from (i.e. not glue and
* obscured by NS or DNAME or NSEC3-only), and also return the
* closest-encloser from that, closest node that should be used
* to generate answers from that is above the query */
node_exists = az_find_ce(z, qinfo, node, node_exact, &ce, &rrset);
if(verbosity >= VERB_ALGO) {
char zname[256], qname[256], nname[256], cename[256],
tpstr[32], rrstr[32];
sldns_wire2str_dname_buf(qinfo->qname, qinfo->qname_len, qname,
sizeof(qname));
sldns_wire2str_type_buf(qinfo->qtype, tpstr, sizeof(tpstr));
sldns_wire2str_dname_buf(z->name, z->namelen, zname,
sizeof(zname));
if(node)
sldns_wire2str_dname_buf(node->name, node->namelen,
nname, sizeof(nname));
else snprintf(nname, sizeof(nname), "NULL");
if(ce)
sldns_wire2str_dname_buf(ce->name, ce->namelen,
cename, sizeof(cename));
else snprintf(cename, sizeof(cename), "NULL");
if(rrset) sldns_wire2str_type_buf(rrset->type, rrstr,
sizeof(rrstr));
else snprintf(rrstr, sizeof(rrstr), "NULL");
log_info("auth_zone %s query %s %s, domain %s %s %s, "
"ce %s, rrset %s", zname, qname, tpstr, nname,
(node_exact?"exact":"notexact"),
(node_exists?"exist":"notexist"), cename, rrstr);
}
if(node_exists) {
/* the node is fine, generate answer from node */
return az_generate_answer_with_node(z, qinfo, region, *msg,
node);
}
return az_generate_answer_nonexistnode(z, qinfo, region, *msg,
ce, rrset, node);
}
int auth_zones_lookup(struct auth_zones* az, struct query_info* qinfo,
struct regional* region, struct dns_msg** msg, int* fallback,
uint8_t* dp_nm, size_t dp_nmlen)
{
int r;
struct auth_zone* z;
/* find the zone that should contain the answer. */
lock_rw_rdlock(&az->lock);
z = auth_zone_find(az, dp_nm, dp_nmlen, qinfo->qclass);
if(!z) {
lock_rw_unlock(&az->lock);
/* no auth zone, fallback to internet */
*fallback = 1;
return 0;
}
lock_rw_rdlock(&z->lock);
lock_rw_unlock(&az->lock);
/* if not for upstream queries, fallback */
if(!z->for_upstream) {
lock_rw_unlock(&z->lock);
*fallback = 1;
return 0;
}
if(z->zone_expired) {
*fallback = z->fallback_enabled;
lock_rw_unlock(&z->lock);
return 0;
}
/* see what answer that zone would generate */
r = auth_zone_generate_answer(z, qinfo, region, msg, fallback);
lock_rw_unlock(&z->lock);
return r;
}
/** encode auth answer */
static void
auth_answer_encode(struct query_info* qinfo, struct module_env* env,
struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
struct regional* temp, struct dns_msg* msg)
{
uint16_t udpsize;
udpsize = edns->udp_size;
edns->edns_version = EDNS_ADVERTISED_VERSION;
edns->udp_size = EDNS_ADVERTISED_SIZE;
edns->ext_rcode = 0;
edns->bits &= EDNS_DO;
if(!inplace_cb_reply_local_call(env, qinfo, NULL, msg->rep,
(int)FLAGS_GET_RCODE(msg->rep->flags), edns, repinfo, temp)
|| !reply_info_answer_encode(qinfo, msg->rep,
*(uint16_t*)sldns_buffer_begin(buf),
sldns_buffer_read_u16_at(buf, 2),
buf, 0, 0, temp, udpsize, edns,
(int)(edns->bits&EDNS_DO), 0)) {
error_encode(buf, (LDNS_RCODE_SERVFAIL|BIT_AA), qinfo,
*(uint16_t*)sldns_buffer_begin(buf),
sldns_buffer_read_u16_at(buf, 2), edns);
}
}
/** encode auth error answer */
static void
auth_error_encode(struct query_info* qinfo, struct module_env* env,
struct edns_data* edns, struct comm_reply* repinfo, sldns_buffer* buf,
struct regional* temp, int rcode)
{
edns->edns_version = EDNS_ADVERTISED_VERSION;
edns->udp_size = EDNS_ADVERTISED_SIZE;
edns->ext_rcode = 0;
edns->bits &= EDNS_DO;
if(!inplace_cb_reply_local_call(env, qinfo, NULL, NULL,
rcode, edns, repinfo, temp))
edns->opt_list = NULL;
error_encode(buf, rcode|BIT_AA, qinfo,
*(uint16_t*)sldns_buffer_begin(buf),
sldns_buffer_read_u16_at(buf, 2), edns);
}
int auth_zones_answer(struct auth_zones* az, struct module_env* env,
struct query_info* qinfo, struct edns_data* edns,
struct comm_reply* repinfo, struct sldns_buffer* buf, struct regional* temp)
{
struct dns_msg* msg = NULL;
struct auth_zone* z;
int r;
int fallback = 0;
lock_rw_rdlock(&az->lock);
if(!az->have_downstream) {
/* no downstream auth zones */
lock_rw_unlock(&az->lock);
return 0;
}
if(qinfo->qtype == LDNS_RR_TYPE_DS) {
uint8_t* delname = qinfo->qname;
size_t delnamelen = qinfo->qname_len;
dname_remove_label(&delname, &delnamelen);
z = auth_zones_find_zone(az, delname, delnamelen,
qinfo->qclass);
} else {
z = auth_zones_find_zone(az, qinfo->qname, qinfo->qname_len,
qinfo->qclass);
}
if(!z) {
/* no zone above it */
lock_rw_unlock(&az->lock);
return 0;
}
lock_rw_rdlock(&z->lock);
lock_rw_unlock(&az->lock);
if(!z->for_downstream) {
lock_rw_unlock(&z->lock);
return 0;
}
if(z->zone_expired) {
if(z->fallback_enabled) {
lock_rw_unlock(&z->lock);
return 0;
}
lock_rw_unlock(&z->lock);
lock_rw_wrlock(&az->lock);
az->num_query_down++;
lock_rw_unlock(&az->lock);
auth_error_encode(qinfo, env, edns, repinfo, buf, temp,
LDNS_RCODE_SERVFAIL);
return 1;
}
/* answer it from zone z */
r = auth_zone_generate_answer(z, qinfo, temp, &msg, &fallback);
lock_rw_unlock(&z->lock);
if(!r && fallback) {
/* fallback to regular answering (recursive) */
return 0;
}
lock_rw_wrlock(&az->lock);
az->num_query_down++;
lock_rw_unlock(&az->lock);
/* encode answer */
if(!r)
auth_error_encode(qinfo, env, edns, repinfo, buf, temp,
LDNS_RCODE_SERVFAIL);
else auth_answer_encode(qinfo, env, edns, repinfo, buf, temp, msg);
return 1;
}
int auth_zones_can_fallback(struct auth_zones* az, uint8_t* nm, size_t nmlen,
uint16_t dclass)
{
int r;
struct auth_zone* z;
lock_rw_rdlock(&az->lock);
z = auth_zone_find(az, nm, nmlen, dclass);
if(!z) {
lock_rw_unlock(&az->lock);
/* no such auth zone, fallback */
return 1;
}
lock_rw_rdlock(&z->lock);
lock_rw_unlock(&az->lock);
r = z->fallback_enabled || (!z->for_upstream);
lock_rw_unlock(&z->lock);
return r;
}
int
auth_zone_parse_notify_serial(sldns_buffer* pkt, uint32_t *serial)
{
struct query_info q;
uint16_t rdlen;
memset(&q, 0, sizeof(q));
sldns_buffer_set_position(pkt, 0);
if(!query_info_parse(&q, pkt)) return 0;
if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0) return 0;
/* skip name of RR in answer section */
if(sldns_buffer_remaining(pkt) < 1) return 0;
if(pkt_dname_len(pkt) == 0) return 0;
/* check type */
if(sldns_buffer_remaining(pkt) < 10 /* type,class,ttl,rdatalen*/)
return 0;
if(sldns_buffer_read_u16(pkt) != LDNS_RR_TYPE_SOA) return 0;
sldns_buffer_skip(pkt, 2); /* class */
sldns_buffer_skip(pkt, 4); /* ttl */
rdlen = sldns_buffer_read_u16(pkt); /* rdatalen */
if(sldns_buffer_remaining(pkt) < rdlen) return 0;
if(rdlen < 22) return 0; /* bad soa length */
sldns_buffer_skip(pkt, (ssize_t)(rdlen-20));
*serial = sldns_buffer_read_u32(pkt);
/* return true when has serial in answer section */
return 1;
}
/** see if addr appears in the list */
static int
addr_in_list(struct auth_addr* list, struct sockaddr_storage* addr,
socklen_t addrlen)
{
struct auth_addr* p;
for(p=list; p; p=p->next) {
if(sockaddr_cmp_addr(addr, addrlen, &p->addr, p->addrlen)==0)
return 1;
}
return 0;
}
/** check if an address matches a master specification (or one of its
* addresses in the addr list) */
static int
addr_matches_master(struct auth_master* master, struct sockaddr_storage* addr,
socklen_t addrlen, struct auth_master** fromhost)
{
struct sockaddr_storage a;
socklen_t alen = 0;
int net = 0;
if(addr_in_list(master->list, addr, addrlen)) {
*fromhost = master;
return 1;
}
/* compare address (but not port number, that is the destination
* port of the master, the port number of the received notify is
* allowed to by any port on that master) */
if(extstrtoaddr(master->host, &a, &alen) &&
sockaddr_cmp_addr(addr, addrlen, &a, alen)==0) {
*fromhost = master;
return 1;
}
/* prefixes, addr/len, like 10.0.0.0/8 */
/* not http and has a / and there is one / */
if(master->allow_notify && !master->http &&
strchr(master->host, '/') != NULL &&
strchr(master->host, '/') == strrchr(master->host, '/') &&
netblockstrtoaddr(master->host, UNBOUND_DNS_PORT, &a, &alen,
&net) && alen == addrlen) {
if(addr_in_common(addr, (addr_is_ip6(addr, addrlen)?128:32),
&a, net, alen) >= net) {
*fromhost = NULL; /* prefix does not have destination
to send the probe or transfer with */
return 1; /* matches the netblock */
}
}
return 0;
}
/** check access list for notifies */
static int
az_xfr_allowed_notify(struct auth_xfer* xfr, struct sockaddr_storage* addr,
socklen_t addrlen, struct auth_master** fromhost)
{
struct auth_master* p;
for(p=xfr->allow_notify_list; p; p=p->next) {
if(addr_matches_master(p, addr, addrlen, fromhost)) {
return 1;
}
}
return 0;
}
/** see if the serial means the zone has to be updated, i.e. the serial
* is newer than the zone serial, or we have no zone */
static int
xfr_serial_means_update(struct auth_xfer* xfr, uint32_t serial)
{
if(!xfr->have_zone)
return 1; /* no zone, anything is better */
if(xfr->zone_expired)
return 1; /* expired, the sent serial is better than expired
data */
if(compare_serial(xfr->serial, serial) < 0)
return 1; /* our serial is smaller than the sent serial,
the data is newer, fetch it */
return 0;
}
/** note notify serial, updates the notify information in the xfr struct */
static void
xfr_note_notify_serial(struct auth_xfer* xfr, int has_serial, uint32_t serial)
{
if(xfr->notify_received && xfr->notify_has_serial && has_serial) {
/* see if this serial is newer */
if(compare_serial(xfr->notify_serial, serial) < 0)
xfr->notify_serial = serial;
} else if(xfr->notify_received && xfr->notify_has_serial &&
!has_serial) {
/* remove serial, we have notify without serial */
xfr->notify_has_serial = 0;
xfr->notify_serial = 0;
} else if(xfr->notify_received && !xfr->notify_has_serial) {
/* we already have notify without serial, keep it
* that way; no serial check when current operation
* is done */
} else {
xfr->notify_received = 1;
xfr->notify_has_serial = has_serial;
xfr->notify_serial = serial;
}
}
/** process a notify serial, start new probe or note serial. xfr is locked */
static void
xfr_process_notify(struct auth_xfer* xfr, struct module_env* env,
int has_serial, uint32_t serial, struct auth_master* fromhost)
{
/* if the serial of notify is older than we have, don't fetch
* a zone, we already have it */
if(has_serial && !xfr_serial_means_update(xfr, serial)) {
lock_basic_unlock(&xfr->lock);
return;
}
/* start new probe with this addr src, or note serial */
if(!xfr_start_probe(xfr, env, fromhost)) {
/* not started because already in progress, note the serial */
xfr_note_notify_serial(xfr, has_serial, serial);
lock_basic_unlock(&xfr->lock);
}
/* successful end of start_probe unlocked xfr->lock */
}
int auth_zones_notify(struct auth_zones* az, struct module_env* env,
uint8_t* nm, size_t nmlen, uint16_t dclass,
struct sockaddr_storage* addr, socklen_t addrlen, int has_serial,
uint32_t serial, int* refused)
{
struct auth_xfer* xfr;
struct auth_master* fromhost = NULL;
/* see which zone this is */
lock_rw_rdlock(&az->lock);
xfr = auth_xfer_find(az, nm, nmlen, dclass);
if(!xfr) {
lock_rw_unlock(&az->lock);
/* no such zone, refuse the notify */
*refused = 1;
return 0;
}
lock_basic_lock(&xfr->lock);
lock_rw_unlock(&az->lock);
/* check access list for notifies */
if(!az_xfr_allowed_notify(xfr, addr, addrlen, &fromhost)) {
lock_basic_unlock(&xfr->lock);
/* notify not allowed, refuse the notify */
*refused = 1;
return 0;
}
/* process the notify */
xfr_process_notify(xfr, env, has_serial, serial, fromhost);
return 1;
}
int auth_zones_startprobesequence(struct auth_zones* az,
struct module_env* env, uint8_t* nm, size_t nmlen, uint16_t dclass)
{
struct auth_xfer* xfr;
lock_rw_rdlock(&az->lock);
xfr = auth_xfer_find(az, nm, nmlen, dclass);
if(!xfr) {
lock_rw_unlock(&az->lock);
return 0;
}
lock_basic_lock(&xfr->lock);
lock_rw_unlock(&az->lock);
xfr_process_notify(xfr, env, 0, 0, NULL);
return 1;
}
/** set a zone expired */
static void
auth_xfer_set_expired(struct auth_xfer* xfr, struct module_env* env,
int expired)
{
struct auth_zone* z;
/* expire xfr */
lock_basic_lock(&xfr->lock);
xfr->zone_expired = expired;
lock_basic_unlock(&xfr->lock);
/* find auth_zone */
lock_rw_rdlock(&env->auth_zones->lock);
z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
xfr->dclass);
if(!z) {
lock_rw_unlock(&env->auth_zones->lock);
return;
}
lock_rw_wrlock(&z->lock);
lock_rw_unlock(&env->auth_zones->lock);
/* expire auth_zone */
z->zone_expired = expired;
lock_rw_unlock(&z->lock);
}
/** find master (from notify or probe) in list of masters */
static struct auth_master*
find_master_by_host(struct auth_master* list, char* host)
{
struct auth_master* p;
for(p=list; p; p=p->next) {
if(strcmp(p->host, host) == 0)
return p;
}
return NULL;
}
/** delete the looked up auth_addrs for all the masters in the list */
static void
xfr_masterlist_free_addrs(struct auth_master* list)
{
struct auth_master* m;
for(m=list; m; m=m->next) {
if(m->list) {
auth_free_master_addrs(m->list);
m->list = NULL;
}
}
}
/** copy a list of auth_addrs */
static struct auth_addr*
auth_addr_list_copy(struct auth_addr* source)
{
struct auth_addr* list = NULL, *last = NULL;
struct auth_addr* p;
for(p=source; p; p=p->next) {
struct auth_addr* a = (struct auth_addr*)memdup(p, sizeof(*p));
if(!a) {
log_err("malloc failure");
auth_free_master_addrs(list);
return NULL;
}
a->next = NULL;
if(last) last->next = a;
if(!list) list = a;
last = a;
}
return list;
}
/** copy a master to a new structure, NULL on alloc failure */
static struct auth_master*
auth_master_copy(struct auth_master* o)
{
struct auth_master* m;
if(!o) return NULL;
m = (struct auth_master*)memdup(o, sizeof(*o));
if(!m) {
log_err("malloc failure");
return NULL;
}
m->next = NULL;
if(m->host) {
m->host = strdup(m->host);
if(!m->host) {
free(m);
log_err("malloc failure");
return NULL;
}
}
if(m->file) {
m->file = strdup(m->file);
if(!m->file) {
free(m->host);
free(m);
log_err("malloc failure");
return NULL;
}
}
if(m->list) {
m->list = auth_addr_list_copy(m->list);
if(!m->list) {
free(m->file);
free(m->host);
free(m);
return NULL;
}
}
return m;
}
/** copy the master addresses from the task_probe lookups to the allow_notify
* list of masters */
static void
probe_copy_masters_for_allow_notify(struct auth_xfer* xfr)
{
struct auth_master* list = NULL, *last = NULL;
struct auth_master* p;
/* build up new list with copies */
for(p = xfr->task_probe->masters; p; p=p->next) {
struct auth_master* m = auth_master_copy(p);
if(!m) {
auth_free_masters(list);
/* failed because of malloc failure, use old list */
return;
}
m->next = NULL;
if(last) last->next = m;
if(!list) list = m;
last = m;
}
/* success, replace list */
auth_free_masters(xfr->allow_notify_list);
xfr->allow_notify_list = list;
}
/** start the lookups for task_transfer */
static void
xfr_transfer_start_lookups(struct auth_xfer* xfr)
{
/* delete all the looked up addresses in the list */
xfr->task_transfer->scan_addr = NULL;
xfr_masterlist_free_addrs(xfr->task_transfer->masters);
/* start lookup at the first master */
xfr->task_transfer->lookup_target = xfr->task_transfer->masters;
xfr->task_transfer->lookup_aaaa = 0;
}
/** move to the next lookup of hostname for task_transfer */
static void
xfr_transfer_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env)
{
if(!xfr->task_transfer->lookup_target)
return; /* already at end of list */
if(!xfr->task_transfer->lookup_aaaa && env->cfg->do_ip6) {
/* move to lookup AAAA */
xfr->task_transfer->lookup_aaaa = 1;
return;
}
xfr->task_transfer->lookup_target =
xfr->task_transfer->lookup_target->next;
xfr->task_transfer->lookup_aaaa = 0;
if(!env->cfg->do_ip4 && xfr->task_transfer->lookup_target!=NULL)
xfr->task_transfer->lookup_aaaa = 1;
}
/** start the lookups for task_probe */
static void
xfr_probe_start_lookups(struct auth_xfer* xfr)
{
/* delete all the looked up addresses in the list */
xfr->task_probe->scan_addr = NULL;
xfr_masterlist_free_addrs(xfr->task_probe->masters);
/* start lookup at the first master */
xfr->task_probe->lookup_target = xfr->task_probe->masters;
xfr->task_probe->lookup_aaaa = 0;
}
/** move to the next lookup of hostname for task_probe */
static void
xfr_probe_move_to_next_lookup(struct auth_xfer* xfr, struct module_env* env)
{
if(!xfr->task_probe->lookup_target)
return; /* already at end of list */
if(!xfr->task_probe->lookup_aaaa && env->cfg->do_ip6) {
/* move to lookup AAAA */
xfr->task_probe->lookup_aaaa = 1;
return;
}
xfr->task_probe->lookup_target = xfr->task_probe->lookup_target->next;
xfr->task_probe->lookup_aaaa = 0;
if(!env->cfg->do_ip4 && xfr->task_probe->lookup_target!=NULL)
xfr->task_probe->lookup_aaaa = 1;
}
/** start the iteration of the task_transfer list of masters */
static void
xfr_transfer_start_list(struct auth_xfer* xfr, struct auth_master* spec)
{
if(spec) {
xfr->task_transfer->scan_specific = find_master_by_host(
xfr->task_transfer->masters, spec->host);
if(xfr->task_transfer->scan_specific) {
xfr->task_transfer->scan_target = NULL;
xfr->task_transfer->scan_addr = NULL;
if(xfr->task_transfer->scan_specific->list)
xfr->task_transfer->scan_addr =
xfr->task_transfer->scan_specific->list;
return;
}
}
/* no specific (notified) host to scan */
xfr->task_transfer->scan_specific = NULL;
xfr->task_transfer->scan_addr = NULL;
/* pick up first scan target */
xfr->task_transfer->scan_target = xfr->task_transfer->masters;
if(xfr->task_transfer->scan_target && xfr->task_transfer->
scan_target->list)
xfr->task_transfer->scan_addr =
xfr->task_transfer->scan_target->list;
}
/** start the iteration of the task_probe list of masters */
static void
xfr_probe_start_list(struct auth_xfer* xfr, struct auth_master* spec)
{
if(spec) {
xfr->task_probe->scan_specific = find_master_by_host(
xfr->task_probe->masters, spec->host);
if(xfr->task_probe->scan_specific) {
xfr->task_probe->scan_target = NULL;
xfr->task_probe->scan_addr = NULL;
if(xfr->task_probe->scan_specific->list)
xfr->task_probe->scan_addr =
xfr->task_probe->scan_specific->list;
return;
}
}
/* no specific (notified) host to scan */
xfr->task_probe->scan_specific = NULL;
xfr->task_probe->scan_addr = NULL;
/* pick up first scan target */
xfr->task_probe->scan_target = xfr->task_probe->masters;
if(xfr->task_probe->scan_target && xfr->task_probe->scan_target->list)
xfr->task_probe->scan_addr =
xfr->task_probe->scan_target->list;
}
/** pick up the master that is being scanned right now, task_transfer */
static struct auth_master*
xfr_transfer_current_master(struct auth_xfer* xfr)
{
if(xfr->task_transfer->scan_specific)
return xfr->task_transfer->scan_specific;
return xfr->task_transfer->scan_target;
}
/** pick up the master that is being scanned right now, task_probe */
static struct auth_master*
xfr_probe_current_master(struct auth_xfer* xfr)
{
if(xfr->task_probe->scan_specific)
return xfr->task_probe->scan_specific;
return xfr->task_probe->scan_target;
}
/** true if at end of list, task_transfer */
static int
xfr_transfer_end_of_list(struct auth_xfer* xfr)
{
return !xfr->task_transfer->scan_specific &&
!xfr->task_transfer->scan_target;
}
/** true if at end of list, task_probe */
static int
xfr_probe_end_of_list(struct auth_xfer* xfr)
{
return !xfr->task_probe->scan_specific && !xfr->task_probe->scan_target;
}
/** move to next master in list, task_transfer */
static void
xfr_transfer_nextmaster(struct auth_xfer* xfr)
{
if(!xfr->task_transfer->scan_specific &&
!xfr->task_transfer->scan_target)
return;
if(xfr->task_transfer->scan_addr) {
xfr->task_transfer->scan_addr =
xfr->task_transfer->scan_addr->next;
if(xfr->task_transfer->scan_addr)
return;
}
if(xfr->task_transfer->scan_specific) {
xfr->task_transfer->scan_specific = NULL;
xfr->task_transfer->scan_target = xfr->task_transfer->masters;
if(xfr->task_transfer->scan_target && xfr->task_transfer->
scan_target->list)
xfr->task_transfer->scan_addr =
xfr->task_transfer->scan_target->list;
return;
}
if(!xfr->task_transfer->scan_target)
return;
xfr->task_transfer->scan_target = xfr->task_transfer->scan_target->next;
if(xfr->task_transfer->scan_target && xfr->task_transfer->
scan_target->list)
xfr->task_transfer->scan_addr =
xfr->task_transfer->scan_target->list;
return;
}
/** move to next master in list, task_probe */
static void
xfr_probe_nextmaster(struct auth_xfer* xfr)
{
if(!xfr->task_probe->scan_specific && !xfr->task_probe->scan_target)
return;
if(xfr->task_probe->scan_addr) {
xfr->task_probe->scan_addr = xfr->task_probe->scan_addr->next;
if(xfr->task_probe->scan_addr)
return;
}
if(xfr->task_probe->scan_specific) {
xfr->task_probe->scan_specific = NULL;
xfr->task_probe->scan_target = xfr->task_probe->masters;
if(xfr->task_probe->scan_target && xfr->task_probe->
scan_target->list)
xfr->task_probe->scan_addr =
xfr->task_probe->scan_target->list;
return;
}
if(!xfr->task_probe->scan_target)
return;
xfr->task_probe->scan_target = xfr->task_probe->scan_target->next;
if(xfr->task_probe->scan_target && xfr->task_probe->
scan_target->list)
xfr->task_probe->scan_addr =
xfr->task_probe->scan_target->list;
return;
}
/** create SOA probe packet for xfr */
static void
xfr_create_soa_probe_packet(struct auth_xfer* xfr, sldns_buffer* buf,
uint16_t id)
{
struct query_info qinfo;
memset(&qinfo, 0, sizeof(qinfo));
qinfo.qname = xfr->name;
qinfo.qname_len = xfr->namelen;
qinfo.qtype = LDNS_RR_TYPE_SOA;
qinfo.qclass = xfr->dclass;
qinfo_query_encode(buf, &qinfo);
sldns_buffer_write_u16_at(buf, 0, id);
}
/** create IXFR/AXFR packet for xfr */
static void
xfr_create_ixfr_packet(struct auth_xfer* xfr, sldns_buffer* buf, uint16_t id,
struct auth_master* master)
{
struct query_info qinfo;
uint32_t serial;
int have_zone;
have_zone = xfr->have_zone;
serial = xfr->serial;
memset(&qinfo, 0, sizeof(qinfo));
qinfo.qname = xfr->name;
qinfo.qname_len = xfr->namelen;
xfr->task_transfer->got_xfr_serial = 0;
xfr->task_transfer->rr_scan_num = 0;
xfr->task_transfer->incoming_xfr_serial = 0;
xfr->task_transfer->on_ixfr_is_axfr = 0;
xfr->task_transfer->on_ixfr = 1;
qinfo.qtype = LDNS_RR_TYPE_IXFR;
if(!have_zone || xfr->task_transfer->ixfr_fail || !master->ixfr) {
qinfo.qtype = LDNS_RR_TYPE_AXFR;
xfr->task_transfer->ixfr_fail = 0;
xfr->task_transfer->on_ixfr = 0;
}
qinfo.qclass = xfr->dclass;
qinfo_query_encode(buf, &qinfo);
sldns_buffer_write_u16_at(buf, 0, id);
/* append serial for IXFR */
if(qinfo.qtype == LDNS_RR_TYPE_IXFR) {
size_t end = sldns_buffer_limit(buf);
sldns_buffer_clear(buf);
sldns_buffer_set_position(buf, end);
/* auth section count 1 */
sldns_buffer_write_u16_at(buf, LDNS_NSCOUNT_OFF, 1);
/* write SOA */
sldns_buffer_write_u8(buf, 0xC0); /* compressed ptr to qname */
sldns_buffer_write_u8(buf, 0x0C);
sldns_buffer_write_u16(buf, LDNS_RR_TYPE_SOA);
sldns_buffer_write_u16(buf, qinfo.qclass);
sldns_buffer_write_u32(buf, 0); /* ttl */
sldns_buffer_write_u16(buf, 22); /* rdata length */
sldns_buffer_write_u8(buf, 0); /* . */
sldns_buffer_write_u8(buf, 0); /* . */
sldns_buffer_write_u32(buf, serial); /* serial */
sldns_buffer_write_u32(buf, 0); /* refresh */
sldns_buffer_write_u32(buf, 0); /* retry */
sldns_buffer_write_u32(buf, 0); /* expire */
sldns_buffer_write_u32(buf, 0); /* minimum */
sldns_buffer_flip(buf);
}
}
/** check if returned packet is OK */
static int
check_packet_ok(sldns_buffer* pkt, uint16_t qtype, struct auth_xfer* xfr,
uint32_t* serial)
{
/* parse to see if packet worked, valid reply */
/* check serial number of SOA */
if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE)
return 0;
/* check ID */
if(LDNS_ID_WIRE(sldns_buffer_begin(pkt)) != xfr->task_probe->id)
return 0;
/* check flag bits and rcode */
if(!LDNS_QR_WIRE(sldns_buffer_begin(pkt)))
return 0;
if(LDNS_OPCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_PACKET_QUERY)
return 0;
if(LDNS_RCODE_WIRE(sldns_buffer_begin(pkt)) != LDNS_RCODE_NOERROR)
return 0;
/* check qname */
if(LDNS_QDCOUNT(sldns_buffer_begin(pkt)) != 1)
return 0;
sldns_buffer_skip(pkt, LDNS_HEADER_SIZE);
if(sldns_buffer_remaining(pkt) < xfr->namelen)
return 0;
if(query_dname_compare(sldns_buffer_current(pkt), xfr->name) != 0)
return 0;
sldns_buffer_skip(pkt, (ssize_t)xfr->namelen);
/* check qtype, qclass */
if(sldns_buffer_remaining(pkt) < 4)
return 0;
if(sldns_buffer_read_u16(pkt) != qtype)
return 0;
if(sldns_buffer_read_u16(pkt) != xfr->dclass)
return 0;
if(serial) {
uint16_t rdlen;
/* read serial number, from answer section SOA */
if(LDNS_ANCOUNT(sldns_buffer_begin(pkt)) == 0)
return 0;
/* read from first record SOA record */
if(sldns_buffer_remaining(pkt) < 1)
return 0;
if(dname_pkt_compare(pkt, sldns_buffer_current(pkt),
xfr->name) != 0)
return 0;
if(!pkt_dname_len(pkt))
return 0;
/* type, class, ttl, rdatalen */
if(sldns_buffer_remaining(pkt) < 4+4+2)
return 0;
if(sldns_buffer_read_u16(pkt) != qtype)
return 0;
if(sldns_buffer_read_u16(pkt) != xfr->dclass)
return 0;
sldns_buffer_skip(pkt, 4); /* ttl */
rdlen = sldns_buffer_read_u16(pkt);
if(sldns_buffer_remaining(pkt) < rdlen)
return 0;
if(sldns_buffer_remaining(pkt) < 1)
return 0;
if(!pkt_dname_len(pkt)) /* soa name */
return 0;
if(sldns_buffer_remaining(pkt) < 1)
return 0;
if(!pkt_dname_len(pkt)) /* soa name */
return 0;
if(sldns_buffer_remaining(pkt) < 20)
return 0;
*serial = sldns_buffer_read_u32(pkt);
}
return 1;
}
/** read one line from chunks into buffer at current position */
static int
chunkline_get_line(struct auth_chunk** chunk, size_t* chunk_pos,
sldns_buffer* buf)
{
int readsome = 0;
while(*chunk) {
/* more text in this chunk? */
if(*chunk_pos < (*chunk)->len) {
readsome = 1;
while(*chunk_pos < (*chunk)->len) {
char c = (char)((*chunk)->data[*chunk_pos]);
(*chunk_pos)++;
if(sldns_buffer_remaining(buf) < 2) {
/* buffer too short */
verbose(VERB_ALGO, "http chunkline, "
"line too long");
return 0;
}
sldns_buffer_write_u8(buf, (uint8_t)c);
if(c == '\n') {
/* we are done */
return 1;
}
}
}
/* move to next chunk */
*chunk = (*chunk)->next;
*chunk_pos = 0;
}
/* no more text */
if(readsome) return 1;
return 0;
}
/** count number of open and closed parenthesis in a chunkline */
static int
chunkline_count_parens(sldns_buffer* buf, size_t start)
{
size_t end = sldns_buffer_position(buf);
size_t i;
int count = 0;
int squote = 0, dquote = 0;
for(i=start; i<end; i++) {
char c = (char)sldns_buffer_read_u8_at(buf, i);
if(squote && c != '\'') continue;
if(dquote && c != '"') continue;
if(c == '"')
dquote = !dquote; /* skip quoted part */
else if(c == '\'')
squote = !squote; /* skip quoted part */
else if(c == '(')
count ++;
else if(c == ')')
count --;
else if(c == ';') {
/* rest is a comment */
return count;
}
}
return count;
}
/** remove trailing ;... comment from a line in the chunkline buffer */
static void
chunkline_remove_trailcomment(sldns_buffer* buf, size_t start)
{
size_t end = sldns_buffer_position(buf);
size_t i;
int squote = 0, dquote = 0;
for(i=start; i<end; i++) {
char c = (char)sldns_buffer_read_u8_at(buf, i);
if(squote && c != '\'') continue;
if(dquote && c != '"') continue;
if(c == '"')
dquote = !dquote; /* skip quoted part */
else if(c == '\'')
squote = !squote; /* skip quoted part */
else if(c == ';') {
/* rest is a comment */
sldns_buffer_set_position(buf, i);
return;
}
}
/* nothing to remove */
}
/** see if a chunkline is a comment line (or empty line) */
static int
chunkline_is_comment_line_or_empty(sldns_buffer* buf)
{
size_t i, end = sldns_buffer_limit(buf);
for(i=0; i<end; i++) {
char c = (char)sldns_buffer_read_u8_at(buf, i);
if(c == ';')
return 1; /* comment */
else if(c != ' ' && c != '\t' && c != '\r' && c != '\n')
return 0; /* not a comment */
}
return 1; /* empty */
}
/** find a line with ( ) collated */
static int
chunkline_get_line_collated(struct auth_chunk** chunk, size_t* chunk_pos,
sldns_buffer* buf)
{
size_t pos;
int parens = 0;
sldns_buffer_clear(buf);
pos = sldns_buffer_position(buf);
if(!chunkline_get_line(chunk, chunk_pos, buf)) {
if(sldns_buffer_position(buf) < sldns_buffer_limit(buf))
sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0);
sldns_buffer_flip(buf);
return 0;
}
parens += chunkline_count_parens(buf, pos);
while(parens > 0) {
chunkline_remove_trailcomment(buf, pos);
pos = sldns_buffer_position(buf);
if(!chunkline_get_line(chunk, chunk_pos, buf)) {
if(sldns_buffer_position(buf) < sldns_buffer_limit(buf))
sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
else sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf)-1, 0);
sldns_buffer_flip(buf);
return 0;
}
parens += chunkline_count_parens(buf, pos);
}
if(sldns_buffer_remaining(buf) < 1) {
verbose(VERB_ALGO, "http chunkline: "
"line too long");
return 0;
}
sldns_buffer_write_u8_at(buf, sldns_buffer_position(buf), 0);
sldns_buffer_flip(buf);
return 1;
}
/** process $ORIGIN for http */
static int
http_parse_origin(sldns_buffer* buf, struct sldns_file_parse_state* pstate)
{
char* line = (char*)sldns_buffer_begin(buf);
if(strncmp(line, "$ORIGIN", 7) == 0 &&
isspace((unsigned char)line[7])) {
int s;
pstate->origin_len = sizeof(pstate->origin);
s = sldns_str2wire_dname_buf(sldns_strip_ws(line+8),
pstate->origin, &pstate->origin_len);
if(s) pstate->origin_len = 0;
return 1;
}
return 0;
}
/** process $TTL for http */
static int
http_parse_ttl(sldns_buffer* buf, struct sldns_file_parse_state* pstate)
{
char* line = (char*)sldns_buffer_begin(buf);
if(strncmp(line, "$TTL", 4) == 0 &&
isspace((unsigned char)line[4])) {
const char* end = NULL;
pstate->default_ttl = sldns_str2period(
sldns_strip_ws(line+5), &end);
return 1;
}
return 0;
}
/** find noncomment RR line in chunks, collates lines if ( ) format */
static int
chunkline_non_comment_RR(struct auth_chunk** chunk, size_t* chunk_pos,
sldns_buffer* buf, struct sldns_file_parse_state* pstate)
{
while(chunkline_get_line_collated(chunk, chunk_pos, buf)) {
if(chunkline_is_comment_line_or_empty(buf)) {
/* a comment, go to next line */
continue;
}
if(http_parse_origin(buf, pstate)) {
continue; /* $ORIGIN has been handled */
}
if(http_parse_ttl(buf, pstate)) {
continue; /* $TTL has been handled */
}
return 1;
}
/* no noncomments, fail */
return 0;
}
/** check syntax of chunklist zonefile, parse first RR, return false on
* failure and return a string in the scratch buffer (first RR string)
* on failure. */
static int
http_zonefile_syntax_check(struct auth_xfer* xfr, sldns_buffer* buf)
{
uint8_t rr[LDNS_RR_BUF_SIZE];
size_t rr_len, dname_len = 0;
struct sldns_file_parse_state pstate;
struct auth_chunk* chunk;
size_t chunk_pos;
int e;
memset(&pstate, 0, sizeof(pstate));
pstate.default_ttl = 3600;
if(xfr->namelen < sizeof(pstate.origin)) {
pstate.origin_len = xfr->namelen;
memmove(pstate.origin, xfr->name, xfr->namelen);
}
chunk = xfr->task_transfer->chunks_first;
chunk_pos = 0;
if(!chunkline_non_comment_RR(&chunk, &chunk_pos, buf, &pstate)) {
return 0;
}
rr_len = sizeof(rr);
e=sldns_str2wire_rr_buf((char*)sldns_buffer_begin(buf), rr, &rr_len,
&dname_len, pstate.default_ttl,
pstate.origin_len?pstate.origin:NULL, pstate.origin_len,
pstate.prev_rr_len?pstate.prev_rr:NULL, pstate.prev_rr_len);
if(e != 0) {
log_err("parse failure on first RR[%d]: %s",
LDNS_WIREPARSE_OFFSET(e),
sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e)));
return 0;
}
/* check that class is correct */
if(sldns_wirerr_get_class(rr, rr_len, dname_len) != xfr->dclass) {
log_err("parse failure: first record in downloaded zonefile "
"from wrong RR class");
return 0;
}
return 1;
}
/** sum sizes of chunklist */
static size_t
chunklist_sum(struct auth_chunk* list)
{
struct auth_chunk* p;
size_t s = 0;
for(p=list; p; p=p->next) {
s += p->len;
}
return s;
}
/** remove newlines from collated line */
static void
chunkline_newline_removal(sldns_buffer* buf)
{
size_t i, end=sldns_buffer_limit(buf);
for(i=0; i<end; i++) {
char c = (char)sldns_buffer_read_u8_at(buf, i);
if(c == '\n' && i==end-1) {
sldns_buffer_write_u8_at(buf, i, 0);
sldns_buffer_set_limit(buf, end-1);
return;
}
if(c == '\n')
sldns_buffer_write_u8_at(buf, i, (uint8_t)' ');
}
}
/** for http download, parse and add RR to zone */
static int
http_parse_add_rr(struct auth_xfer* xfr, struct auth_zone* z,
sldns_buffer* buf, struct sldns_file_parse_state* pstate)
{
uint8_t rr[LDNS_RR_BUF_SIZE];
size_t rr_len, dname_len = 0;
int e;
char* line = (char*)sldns_buffer_begin(buf);
rr_len = sizeof(rr);
e = sldns_str2wire_rr_buf(line, rr, &rr_len, &dname_len,
pstate->default_ttl,
pstate->origin_len?pstate->origin:NULL, pstate->origin_len,
pstate->prev_rr_len?pstate->prev_rr:NULL, pstate->prev_rr_len);
if(e != 0) {
log_err("%s/%s parse failure RR[%d]: %s in '%s'",
xfr->task_transfer->master->host,
xfr->task_transfer->master->file,
LDNS_WIREPARSE_OFFSET(e),
sldns_get_errorstr_parse(LDNS_WIREPARSE_ERROR(e)),
line);
return 0;
}
if(rr_len == 0)
return 1; /* empty line or so */
/* set prev */
if(dname_len < sizeof(pstate->prev_rr)) {
memmove(pstate->prev_rr, rr, dname_len);
pstate->prev_rr_len = dname_len;
}
return az_insert_rr(z, rr, rr_len, dname_len, NULL);
}
/** RR list iterator, returns RRs from answer section one by one from the
* dns packets in the chunklist */
static void
chunk_rrlist_start(struct auth_xfer* xfr, struct auth_chunk** rr_chunk,
int* rr_num, size_t* rr_pos)
{
*rr_chunk = xfr->task_transfer->chunks_first;
*rr_num = 0;
*rr_pos = 0;
}
/** RR list iterator, see if we are at the end of the list */
static int
chunk_rrlist_end(struct auth_chunk* rr_chunk, int rr_num)
{
while(rr_chunk) {
if(rr_chunk->len < LDNS_HEADER_SIZE)
return 1;
if(rr_num < (int)LDNS_ANCOUNT(rr_chunk->data))
return 0;
/* no more RRs in this chunk */
/* continue with next chunk, see if it has RRs */
rr_chunk = rr_chunk->next;
rr_num = 0;
}
return 1;
}
/** RR list iterator, move to next RR */
static void
chunk_rrlist_gonext(struct auth_chunk** rr_chunk, int* rr_num,
size_t* rr_pos, size_t rr_nextpos)
{
/* already at end of chunks? */
if(!*rr_chunk)
return;
/* move within this chunk */
if((*rr_chunk)->len >= LDNS_HEADER_SIZE &&
(*rr_num)+1 < (int)LDNS_ANCOUNT((*rr_chunk)->data)) {
(*rr_num) += 1;
*rr_pos = rr_nextpos;
return;
}
/* no more RRs in this chunk */
/* continue with next chunk, see if it has RRs */
if(*rr_chunk)
*rr_chunk = (*rr_chunk)->next;
while(*rr_chunk) {
*rr_num = 0;
*rr_pos = 0;
if((*rr_chunk)->len >= LDNS_HEADER_SIZE &&
LDNS_ANCOUNT((*rr_chunk)->data) > 0) {
return;
}
*rr_chunk = (*rr_chunk)->next;
}
}
/** RR iterator, get current RR information, false on parse error */
static int
chunk_rrlist_get_current(struct auth_chunk* rr_chunk, int rr_num,
size_t rr_pos, uint8_t** rr_dname, uint16_t* rr_type,
uint16_t* rr_class, uint32_t* rr_ttl, uint16_t* rr_rdlen,
uint8_t** rr_rdata, size_t* rr_nextpos)
{
sldns_buffer pkt;
/* integrity checks on position */
if(!rr_chunk) return 0;
if(rr_chunk->len < LDNS_HEADER_SIZE) return 0;
if(rr_num >= (int)LDNS_ANCOUNT(rr_chunk->data)) return 0;
if(rr_pos >= rr_chunk->len) return 0;
/* fetch rr information */
sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len);
if(rr_pos == 0) {
size_t i;
/* skip question section */
sldns_buffer_set_position(&pkt, LDNS_HEADER_SIZE);
for(i=0; i<LDNS_QDCOUNT(rr_chunk->data); i++) {
if(pkt_dname_len(&pkt) == 0) return 0;
if(sldns_buffer_remaining(&pkt) < 4) return 0;
sldns_buffer_skip(&pkt, 4); /* type and class */
}
} else {
sldns_buffer_set_position(&pkt, rr_pos);
}
*rr_dname = sldns_buffer_current(&pkt);
if(pkt_dname_len(&pkt) == 0) return 0;
if(sldns_buffer_remaining(&pkt) < 10) return 0;
*rr_type = sldns_buffer_read_u16(&pkt);
*rr_class = sldns_buffer_read_u16(&pkt);
*rr_ttl = sldns_buffer_read_u32(&pkt);
*rr_rdlen = sldns_buffer_read_u16(&pkt);
if(sldns_buffer_remaining(&pkt) < (*rr_rdlen)) return 0;
*rr_rdata = sldns_buffer_current(&pkt);
sldns_buffer_skip(&pkt, (ssize_t)(*rr_rdlen));
*rr_nextpos = sldns_buffer_position(&pkt);
return 1;
}
/** print log message where we are in parsing the zone transfer */
static void
log_rrlist_position(const char* label, struct auth_chunk* rr_chunk,
uint8_t* rr_dname, uint16_t rr_type, size_t rr_counter)
{
sldns_buffer pkt;
size_t dlen;
uint8_t buf[256];
char str[256];
char typestr[32];
sldns_buffer_init_frm_data(&pkt, rr_chunk->data, rr_chunk->len);
sldns_buffer_set_position(&pkt, (size_t)(rr_dname -
sldns_buffer_begin(&pkt)));
if((dlen=pkt_dname_len(&pkt)) == 0) return;
if(dlen >= sizeof(buf)) return;
dname_pkt_copy(&pkt, buf, rr_dname);
dname_str(buf, str);
(void)sldns_wire2str_type_buf(rr_type, typestr, sizeof(typestr));
verbose(VERB_ALGO, "%s at[%d] %s %s", label, (int)rr_counter,
str, typestr);
}
/** check that start serial is OK for ixfr. we are at rr_counter == 0,
* and we are going to check rr_counter == 1 (has to be type SOA) serial */
static int
ixfr_start_serial(struct auth_chunk* rr_chunk, int rr_num, size_t rr_pos,
uint8_t* rr_dname, uint16_t rr_type, uint16_t rr_class,
uint32_t rr_ttl, uint16_t rr_rdlen, uint8_t* rr_rdata,
size_t rr_nextpos, uint32_t transfer_serial, uint32_t xfr_serial)
{
uint32_t startserial;
/* move forward on RR */
chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
if(chunk_rrlist_end(rr_chunk, rr_num)) {
/* no second SOA */
verbose(VERB_OPS, "IXFR has no second SOA record");
return 0;
}
if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
&rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
&rr_rdata, &rr_nextpos)) {
verbose(VERB_OPS, "IXFR cannot parse second SOA record");
/* failed to parse RR */
return 0;
}
if(rr_type != LDNS_RR_TYPE_SOA) {
verbose(VERB_OPS, "IXFR second record is not type SOA");
return 0;
}
if(rr_rdlen < 22) {
verbose(VERB_OPS, "IXFR, second SOA has short rdlength");
return 0; /* bad SOA rdlen */
}
startserial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
if(startserial == transfer_serial) {
/* empty AXFR, not an IXFR */
verbose(VERB_OPS, "IXFR second serial same as first");
return 0;
}
if(startserial != xfr_serial) {
/* wrong start serial, it does not match the serial in
* memory */
verbose(VERB_OPS, "IXFR is from serial %u to %u but %u "
"in memory, rejecting the zone transfer",
(unsigned)startserial, (unsigned)transfer_serial,
(unsigned)xfr_serial);
return 0;
}
/* everything OK in second SOA serial */
return 1;
}
/** apply IXFR to zone in memory. z is locked. false on failure(mallocfail) */
static int
apply_ixfr(struct auth_xfer* xfr, struct auth_zone* z,
struct sldns_buffer* scratch_buffer)
{
struct auth_chunk* rr_chunk;
int rr_num;
size_t rr_pos;
uint8_t* rr_dname, *rr_rdata;
uint16_t rr_type, rr_class, rr_rdlen;
uint32_t rr_ttl;
size_t rr_nextpos;
int have_transfer_serial = 0;
uint32_t transfer_serial = 0;
size_t rr_counter = 0;
int delmode = 0;
int softfail = 0;
/* start RR iterator over chunklist of packets */
chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos);
while(!chunk_rrlist_end(rr_chunk, rr_num)) {
if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
&rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
&rr_rdata, &rr_nextpos)) {
/* failed to parse RR */
return 0;
}
if(verbosity>=7) log_rrlist_position("apply ixfr",
rr_chunk, rr_dname, rr_type, rr_counter);
/* twiddle add/del mode and check for start and end */
if(rr_counter == 0 && rr_type != LDNS_RR_TYPE_SOA)
return 0;
if(rr_counter == 1 && rr_type != LDNS_RR_TYPE_SOA) {
/* this is an AXFR returned from the IXFR master */
/* but that should already have been detected, by
* on_ixfr_is_axfr */
return 0;
}
if(rr_type == LDNS_RR_TYPE_SOA) {
uint32_t serial;
if(rr_rdlen < 22) return 0; /* bad SOA rdlen */
serial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
if(have_transfer_serial == 0) {
have_transfer_serial = 1;
transfer_serial = serial;
delmode = 1; /* gets negated below */
/* check second RR before going any further */
if(!ixfr_start_serial(rr_chunk, rr_num, rr_pos,
rr_dname, rr_type, rr_class, rr_ttl,
rr_rdlen, rr_rdata, rr_nextpos,
transfer_serial, xfr->serial)) {
return 0;
}
} else if(transfer_serial == serial) {
have_transfer_serial++;
if(rr_counter == 1) {
/* empty AXFR, with SOA; SOA; */
/* should have been detected by
* on_ixfr_is_axfr */
return 0;
}
if(have_transfer_serial == 3) {
/* see serial three times for end */
/* eg. IXFR:
* SOA 3 start
* SOA 1 second RR, followed by del
* SOA 2 followed by add
* SOA 2 followed by del
* SOA 3 followed by add
* SOA 3 end */
/* ended by SOA record */
xfr->serial = transfer_serial;
break;
}
}
/* twiddle add/del mode */
/* switch from delete part to add part and back again
* just before the soa, it gets deleted and added too
* this means we switch to delete mode for the final
* SOA(so skip that one) */
delmode = !delmode;
}
/* process this RR */
/* if the RR is deleted twice or added twice, then we
* softfail, and continue with the rest of the IXFR, so
* that we serve something fairly nice during the refetch */
if(verbosity>=7) log_rrlist_position((delmode?"del":"add"),
rr_chunk, rr_dname, rr_type, rr_counter);
if(delmode) {
/* delete this RR */
int nonexist = 0;
if(!az_remove_rr_decompress(z, rr_chunk->data,
rr_chunk->len, scratch_buffer, rr_dname,
rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen,
&nonexist)) {
/* failed, malloc error or so */
return 0;
}
if(nonexist) {
/* it was removal of a nonexisting RR */
if(verbosity>=4) log_rrlist_position(
"IXFR error nonexistent RR",
rr_chunk, rr_dname, rr_type, rr_counter);
softfail = 1;
}
} else if(rr_counter != 0) {
/* skip first SOA RR for addition, it is added in
* the addition part near the end of the ixfr, when
* that serial is seen the second time. */
int duplicate = 0;
/* add this RR */
if(!az_insert_rr_decompress(z, rr_chunk->data,
rr_chunk->len, scratch_buffer, rr_dname,
rr_type, rr_class, rr_ttl, rr_rdata, rr_rdlen,
&duplicate)) {
/* failed, malloc error or so */
return 0;
}
if(duplicate) {
/* it was a duplicate */
if(verbosity>=4) log_rrlist_position(
"IXFR error duplicate RR",
rr_chunk, rr_dname, rr_type, rr_counter);
softfail = 1;
}
}
rr_counter++;
chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
}
if(softfail) {
verbose(VERB_ALGO, "IXFR did not apply cleanly, fetching full zone");
return 0;
}
return 1;
}
/** apply AXFR to zone in memory. z is locked. false on failure(mallocfail) */
static int
apply_axfr(struct auth_xfer* xfr, struct auth_zone* z,
struct sldns_buffer* scratch_buffer)
{
struct auth_chunk* rr_chunk;
int rr_num;
size_t rr_pos;
uint8_t* rr_dname, *rr_rdata;
uint16_t rr_type, rr_class, rr_rdlen;
uint32_t rr_ttl;
uint32_t serial = 0;
size_t rr_nextpos;
size_t rr_counter = 0;
int have_end_soa = 0;
/* clear the data tree */
traverse_postorder(&z->data, auth_data_del, NULL);
rbtree_init(&z->data, &auth_data_cmp);
/* clear the RPZ policies */
if(z->rpz)
rpz_clear(z->rpz);
xfr->have_zone = 0;
xfr->serial = 0;
/* insert all RRs in to the zone */
/* insert the SOA only once, skip the last one */
/* start RR iterator over chunklist of packets */
chunk_rrlist_start(xfr, &rr_chunk, &rr_num, &rr_pos);
while(!chunk_rrlist_end(rr_chunk, rr_num)) {
if(!chunk_rrlist_get_current(rr_chunk, rr_num, rr_pos,
&rr_dname, &rr_type, &rr_class, &rr_ttl, &rr_rdlen,
&rr_rdata, &rr_nextpos)) {
/* failed to parse RR */
return 0;
}
if(verbosity>=7) log_rrlist_position("apply_axfr",
rr_chunk, rr_dname, rr_type, rr_counter);
if(rr_type == LDNS_RR_TYPE_SOA) {
if(rr_counter != 0) {
/* end of the axfr */
have_end_soa = 1;
break;
}
if(rr_rdlen < 22) return 0; /* bad SOA rdlen */
serial = sldns_read_uint32(rr_rdata+rr_rdlen-20);
}
/* add this RR */
if(!az_insert_rr_decompress(z, rr_chunk->data, rr_chunk->len,
scratch_buffer, rr_dname, rr_type, rr_class, rr_ttl,
rr_rdata, rr_rdlen, NULL)) {
/* failed, malloc error or so */
return 0;
}
rr_counter++;
chunk_rrlist_gonext(&rr_chunk, &rr_num, &rr_pos, rr_nextpos);
}
if(!have_end_soa) {
log_err("no end SOA record for AXFR");
return 0;
}
xfr->serial = serial;
xfr->have_zone = 1;
return 1;
}
/** apply HTTP to zone in memory. z is locked. false on failure(mallocfail) */
static int
apply_http(struct auth_xfer* xfr, struct auth_zone* z,
struct sldns_buffer* scratch_buffer)
{
/* parse data in chunks */
/* parse RR's and read into memory. ignore $INCLUDE from the
* downloaded file*/
struct sldns_file_parse_state pstate;
struct auth_chunk* chunk;
size_t chunk_pos;
memset(&pstate, 0, sizeof(pstate));
pstate.default_ttl = 3600;
if(xfr->namelen < sizeof(pstate.origin)) {
pstate.origin_len = xfr->namelen;
memmove(pstate.origin, xfr->name, xfr->namelen);
}
if(verbosity >= VERB_ALGO)
verbose(VERB_ALGO, "http download %s of size %d",
xfr->task_transfer->master->file,
(int)chunklist_sum(xfr->task_transfer->chunks_first));
if(xfr->task_transfer->chunks_first && verbosity >= VERB_ALGO) {
char preview[1024];
if(xfr->task_transfer->chunks_first->len+1 > sizeof(preview)) {
memmove(preview, xfr->task_transfer->chunks_first->data,
sizeof(preview)-1);
preview[sizeof(preview)-1]=0;
} else {
memmove(preview, xfr->task_transfer->chunks_first->data,
xfr->task_transfer->chunks_first->len);
preview[xfr->task_transfer->chunks_first->len]=0;
}
log_info("auth zone http downloaded content preview: %s",
preview);
}
/* perhaps a little syntax check before we try to apply the data? */
if(!http_zonefile_syntax_check(xfr, scratch_buffer)) {
log_err("http download %s/%s does not contain a zonefile, "
"but got '%s'", xfr->task_transfer->master->host,
xfr->task_transfer->master->file,
sldns_buffer_begin(scratch_buffer));
return 0;
}
/* clear the data tree */
traverse_postorder(&z->data, auth_data_del, NULL);
rbtree_init(&z->data, &auth_data_cmp);
/* clear the RPZ policies */
if(z->rpz)
rpz_clear(z->rpz);
xfr->have_zone = 0;
xfr->serial = 0;
chunk = xfr->task_transfer->chunks_first;
chunk_pos = 0;
pstate.lineno = 0;
while(chunkline_get_line_collated(&chunk, &chunk_pos, scratch_buffer)) {
/* process this line */
pstate.lineno++;
chunkline_newline_removal(scratch_buffer);
if(chunkline_is_comment_line_or_empty(scratch_buffer)) {
continue;
}
/* parse line and add RR */
if(http_parse_origin(scratch_buffer, &pstate)) {
continue; /* $ORIGIN has been handled */
}
if(http_parse_ttl(scratch_buffer, &pstate)) {
continue; /* $TTL has been handled */
}
if(!http_parse_add_rr(xfr, z, scratch_buffer, &pstate)) {
verbose(VERB_ALGO, "error parsing line [%s:%d] %s",
xfr->task_transfer->master->file,
pstate.lineno,
sldns_buffer_begin(scratch_buffer));
return 0;
}
}
return 1;
}
/** write http chunks to zonefile to create downloaded file */
static int
auth_zone_write_chunks(struct auth_xfer* xfr, const char* fname)
{
FILE* out;
struct auth_chunk* p;
out = fopen(fname, "w");
if(!out) {
log_err("could not open %s: %s", fname, strerror(errno));
return 0;
}
for(p = xfr->task_transfer->chunks_first; p ; p = p->next) {
if(!write_out(out, (char*)p->data, p->len)) {
log_err("could not write http download to %s", fname);
fclose(out);
return 0;
}
}
fclose(out);
return 1;
}
/** write to zonefile after zone has been updated */
static void
xfr_write_after_update(struct auth_xfer* xfr, struct module_env* env)
{
struct config_file* cfg = env->cfg;
struct auth_zone* z;
char tmpfile[1024];
char* zfilename;
lock_basic_unlock(&xfr->lock);
/* get lock again, so it is a readlock and concurrently queries
* can be answered */
lock_rw_rdlock(&env->auth_zones->lock);
z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
xfr->dclass);
if(!z) {
lock_rw_unlock(&env->auth_zones->lock);
/* the zone is gone, ignore xfr results */
lock_basic_lock(&xfr->lock);
return;
}
lock_rw_rdlock(&z->lock);
lock_basic_lock(&xfr->lock);
lock_rw_unlock(&env->auth_zones->lock);
if(z->zonefile == NULL || z->zonefile[0] == 0) {
lock_rw_unlock(&z->lock);
/* no write needed, no zonefile set */
return;
}
zfilename = z->zonefile;
if(cfg->chrootdir && cfg->chrootdir[0] && strncmp(zfilename,
cfg->chrootdir, strlen(cfg->chrootdir)) == 0)
zfilename += strlen(cfg->chrootdir);
if(verbosity >= VERB_ALGO) {
char nm[255+1];
dname_str(z->name, nm);
verbose(VERB_ALGO, "write zonefile %s for %s", zfilename, nm);
}
/* write to tempfile first */
if((size_t)strlen(zfilename) + 16 > sizeof(tmpfile)) {
verbose(VERB_ALGO, "tmpfilename too long, cannot update "
" zonefile %s", zfilename);
lock_rw_unlock(&z->lock);
return;
}
snprintf(tmpfile, sizeof(tmpfile), "%s.tmp%u", zfilename,
(unsigned)getpid());
if(xfr->task_transfer->master->http) {
/* use the stored chunk list to write them */
if(!auth_zone_write_chunks(xfr, tmpfile)) {
unlink(tmpfile);
lock_rw_unlock(&z->lock);
return;
}
} else if(!auth_zone_write_file(z, tmpfile)) {
unlink(tmpfile);
lock_rw_unlock(&z->lock);
return;
}
if(rename(tmpfile, zfilename) < 0) {
log_err("could not rename(%s, %s): %s", tmpfile, zfilename,
strerror(errno));
unlink(tmpfile);
lock_rw_unlock(&z->lock);
return;
}
lock_rw_unlock(&z->lock);
}
/** process chunk list and update zone in memory,
* return false if it did not work */
static int
xfr_process_chunk_list(struct auth_xfer* xfr, struct module_env* env,
int* ixfr_fail)
{
struct auth_zone* z;
/* obtain locks and structures */
/* release xfr lock, then, while holding az->lock grab both
* z->lock and xfr->lock */
lock_basic_unlock(&xfr->lock);
lock_rw_rdlock(&env->auth_zones->lock);
z = auth_zone_find(env->auth_zones, xfr->name, xfr->namelen,
xfr->dclass);
if(!z) {
lock_rw_unlock(&env->auth_zones->lock);
/* the zone is gone, ignore xfr results */
lock_basic_lock(&xfr->lock);
return 0;
}
lock_rw_wrlock(&z->lock);
lock_basic_lock(&xfr->lock);
lock_rw_unlock(&env->auth_zones->lock);
/* apply data */
if(xfr->task_transfer->master->http) {
if(!apply_http(xfr, z, env->scratch_buffer)) {
lock_rw_unlock(&z->lock);
verbose(VERB_ALGO, "http from %s: could not store data",
xfr->task_transfer->master->host);
return 0;
}
} else if(xfr->task_transfer->on_ixfr &&
!xfr->task_transfer->on_ixfr_is_axfr) {
if(!apply_ixfr(xfr, z, env->scratch_buffer)) {
lock_rw_unlock(&z->lock);
verbose(VERB_ALGO, "xfr from %s: could not store IXFR"
" data", xfr->task_transfer->master->host);
*ixfr_fail = 1;
return 0;
}
} else {
if(!apply_axfr(xfr, z, env->scratch_buffer)) {
lock_rw_unlock(&z->lock);
verbose(VERB_ALGO, "xfr from %s: could not store AXFR"
" data", xfr->task_transfer->master->host);
return 0;
}
}
xfr->zone_expired = 0;
z->zone_expired = 0;
if(!xfr_find_soa(z, xfr)) {
lock_rw_unlock(&z->lock);
verbose(VERB_ALGO, "xfr from %s: no SOA in zone after update"
" (or malformed RR)", xfr->task_transfer->master->host);
return 0;
}
if(xfr->have_zone)
xfr->lease_time = *env->now;
if(z->rpz)
rpz_finish_config(z->rpz);
/* unlock */
lock_rw_unlock(&z->lock);
if(verbosity >= VERB_QUERY && xfr->have_zone) {
char zname[256];
dname_str(xfr->name, zname);
verbose(VERB_QUERY, "auth zone %s updated to serial %u", zname,
(unsigned)xfr->serial);
}
/* see if we need to write to a zonefile */
xfr_write_after_update(xfr, env);
return 1;
}
/** disown task_transfer. caller must hold xfr.lock */
static void
xfr_transfer_disown(struct auth_xfer* xfr)
{
/* remove timer (from this worker's event base) */
comm_timer_delete(xfr->task_transfer->timer);
xfr->task_transfer->timer = NULL;
/* remove the commpoint */
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
/* we don't own this item anymore */
xfr->task_transfer->worker = NULL;
xfr->task_transfer->env = NULL;
}
/** lookup a host name for its addresses, if needed */
static int
xfr_transfer_lookup_host(struct auth_xfer* xfr, struct module_env* env)
{
struct sockaddr_storage addr;
socklen_t addrlen = 0;
struct auth_master* master = xfr->task_transfer->lookup_target;
struct query_info qinfo;
uint16_t qflags = BIT_RD;
uint8_t dname[LDNS_MAX_DOMAINLEN+1];
struct edns_data edns;
sldns_buffer* buf = env->scratch_buffer;
if(!master) return 0;
if(extstrtoaddr(master->host, &addr, &addrlen)) {
/* not needed, host is in IP addr format */
return 0;
}
if(master->allow_notify)
return 0; /* allow-notifies are not transferred from, no
lookup is needed */
/* use mesh_new_callback to probe for non-addr hosts,
* and then wait for them to be looked up (in cache, or query) */
qinfo.qname_len = sizeof(dname);
if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len)
!= 0) {
log_err("cannot parse host name of master %s", master->host);
return 0;
}
qinfo.qname = dname;
qinfo.qclass = xfr->dclass;
qinfo.qtype = LDNS_RR_TYPE_A;
if(xfr->task_transfer->lookup_aaaa)
qinfo.qtype = LDNS_RR_TYPE_AAAA;
qinfo.local_alias = NULL;
if(verbosity >= VERB_ALGO) {
char buf1[512];
char buf2[LDNS_MAX_DOMAINLEN+1];
dname_str(xfr->name, buf2);
snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup"
" for task_transfer", buf2);
log_query_info(VERB_ALGO, buf1, &qinfo);
}
edns.edns_present = 1;
edns.ext_rcode = 0;
edns.edns_version = 0;
edns.bits = EDNS_DO;
edns.opt_list = NULL;
if(sldns_buffer_capacity(buf) < 65535)
edns.udp_size = (uint16_t)sldns_buffer_capacity(buf);
else edns.udp_size = 65535;
/* unlock xfr during mesh_new_callback() because the callback can be
* called straight away */
lock_basic_unlock(&xfr->lock);
if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0,
&auth_xfer_transfer_lookup_callback, xfr)) {
lock_basic_lock(&xfr->lock);
log_err("out of memory lookup up master %s", master->host);
return 0;
}
lock_basic_lock(&xfr->lock);
return 1;
}
/** initiate TCP to the target and fetch zone.
* returns true if that was successfully started, and timeout setup. */
static int
xfr_transfer_init_fetch(struct auth_xfer* xfr, struct module_env* env)
{
struct sockaddr_storage addr;
socklen_t addrlen = 0;
struct auth_master* master = xfr->task_transfer->master;
char *auth_name = NULL;
struct timeval t;
int timeout;
if(!master) return 0;
if(master->allow_notify) return 0; /* only for notify */
/* get master addr */
if(xfr->task_transfer->scan_addr) {
addrlen = xfr->task_transfer->scan_addr->addrlen;
memmove(&addr, &xfr->task_transfer->scan_addr->addr, addrlen);
} else {
if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) {
/* the ones that are not in addr format are supposed
* to be looked up. The lookup has failed however,
* so skip them */
char zname[255+1];
dname_str(xfr->name, zname);
log_err("%s: failed lookup, cannot transfer from master %s",
zname, master->host);
return 0;
}
}
/* remove previous TCP connection (if any) */
if(xfr->task_transfer->cp) {
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
}
if(!xfr->task_transfer->timer) {
xfr->task_transfer->timer = comm_timer_create(env->worker_base,
auth_xfer_transfer_timer_callback, xfr);
if(!xfr->task_transfer->timer) {
log_err("malloc failure");
return 0;
}
}
timeout = AUTH_TRANSFER_TIMEOUT;
#ifndef S_SPLINT_S
t.tv_sec = timeout/1000;
t.tv_usec = (timeout%1000)*1000;
#endif
if(master->http) {
/* perform http fetch */
/* store http port number into sockaddr,
* unless someone used unbound's host@port notation */
xfr->task_transfer->on_ixfr = 0;
if(strchr(master->host, '@') == NULL)
sockaddr_store_port(&addr, addrlen, master->port);
xfr->task_transfer->cp = outnet_comm_point_for_http(
env->outnet, auth_xfer_transfer_http_callback, xfr,
&addr, addrlen, -1, master->ssl, master->host,
master->file);
if(!xfr->task_transfer->cp) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "cannot create http cp "
"connection for %s to %s", zname, as);
return 0;
}
comm_timer_set(xfr->task_transfer->timer, &t);
if(verbosity >= VERB_ALGO) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "auth zone %s transfer next HTTP fetch from %s started", zname, as);
}
return 1;
}
/* perform AXFR/IXFR */
/* set the packet to be written */
/* create new ID */
xfr->task_transfer->id = (uint16_t)(ub_random(env->rnd)&0xffff);
xfr_create_ixfr_packet(xfr, env->scratch_buffer,
xfr->task_transfer->id, master);
/* connect on fd */
xfr->task_transfer->cp = outnet_comm_point_for_tcp(env->outnet,
auth_xfer_transfer_tcp_callback, xfr, &addr, addrlen,
env->scratch_buffer, -1,
auth_name != NULL, auth_name);
if(!xfr->task_transfer->cp) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "cannot create tcp cp connection for "
"xfr %s to %s", zname, as);
return 0;
}
comm_timer_set(xfr->task_transfer->timer, &t);
if(verbosity >= VERB_ALGO) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "auth zone %s transfer next %s fetch from %s started", zname,
(xfr->task_transfer->on_ixfr?"IXFR":"AXFR"), as);
}
return 1;
}
/** perform next lookup, next transfer TCP, or end and resume wait time task */
static void
xfr_transfer_nexttarget_or_end(struct auth_xfer* xfr, struct module_env* env)
{
log_assert(xfr->task_transfer->worker == env->worker);
/* are we performing lookups? */
while(xfr->task_transfer->lookup_target) {
if(xfr_transfer_lookup_host(xfr, env)) {
/* wait for lookup to finish,
* note that the hostname may be in unbound's cache
* and we may then get an instant cache response,
* and that calls the callback just like a full
* lookup and lookup failures also call callback */
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s transfer next target lookup", zname);
}
lock_basic_unlock(&xfr->lock);
return;
}
xfr_transfer_move_to_next_lookup(xfr, env);
}
/* initiate TCP and fetch the zone from the master */
/* and set timeout on it */
while(!xfr_transfer_end_of_list(xfr)) {
xfr->task_transfer->master = xfr_transfer_current_master(xfr);
if(xfr_transfer_init_fetch(xfr, env)) {
/* successfully started, wait for callback */
lock_basic_unlock(&xfr->lock);
return;
}
/* failed to fetch, next master */
xfr_transfer_nextmaster(xfr);
}
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s transfer failed, wait", zname);
}
/* we failed to fetch the zone, move to wait task
* use the shorter retry timeout */
xfr_transfer_disown(xfr);
/* pick up the nextprobe task and wait */
if(xfr->task_nextprobe->worker == NULL)
xfr_set_timeout(xfr, env, 1, 0);
lock_basic_unlock(&xfr->lock);
}
/** add addrs from A or AAAA rrset to the master */
static void
xfr_master_add_addrs(struct auth_master* m, struct ub_packed_rrset_key* rrset,
uint16_t rrtype)
{
size_t i;
struct packed_rrset_data* data;
if(!m || !rrset) return;
if(rrtype != LDNS_RR_TYPE_A && rrtype != LDNS_RR_TYPE_AAAA)
return;
data = (struct packed_rrset_data*)rrset->entry.data;
for(i=0; i<data->count; i++) {
struct auth_addr* a;
size_t len = data->rr_len[i] - 2;
uint8_t* rdata = data->rr_data[i]+2;
if(rrtype == LDNS_RR_TYPE_A && len != INET_SIZE)
continue; /* wrong length for A */
if(rrtype == LDNS_RR_TYPE_AAAA && len != INET6_SIZE)
continue; /* wrong length for AAAA */
/* add and alloc it */
a = (struct auth_addr*)calloc(1, sizeof(*a));
if(!a) {
log_err("out of memory");
return;
}
if(rrtype == LDNS_RR_TYPE_A) {
struct sockaddr_in* sa;
a->addrlen = (socklen_t)sizeof(*sa);
sa = (struct sockaddr_in*)&a->addr;
sa->sin_family = AF_INET;
sa->sin_port = (in_port_t)htons(UNBOUND_DNS_PORT);
memmove(&sa->sin_addr, rdata, INET_SIZE);
} else {
struct sockaddr_in6* sa;
a->addrlen = (socklen_t)sizeof(*sa);
sa = (struct sockaddr_in6*)&a->addr;
sa->sin6_family = AF_INET6;
sa->sin6_port = (in_port_t)htons(UNBOUND_DNS_PORT);
memmove(&sa->sin6_addr, rdata, INET6_SIZE);
}
if(verbosity >= VERB_ALGO) {
char s[64];
addr_to_str(&a->addr, a->addrlen, s, sizeof(s));
verbose(VERB_ALGO, "auth host %s lookup %s",
m->host, s);
}
/* append to list */
a->next = m->list;
m->list = a;
}
}
/** callback for task_transfer lookup of host name, of A or AAAA */
void auth_xfer_transfer_lookup_callback(void* arg, int rcode, sldns_buffer* buf,
enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),
int ATTR_UNUSED(was_ratelimited))
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_transfer);
lock_basic_lock(&xfr->lock);
env = xfr->task_transfer->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return; /* stop on quit */
}
/* process result */
if(rcode == LDNS_RCODE_NOERROR) {
uint16_t wanted_qtype = LDNS_RR_TYPE_A;
struct regional* temp = env->scratch;
struct query_info rq;
struct reply_info* rep;
if(xfr->task_transfer->lookup_aaaa)
wanted_qtype = LDNS_RR_TYPE_AAAA;
memset(&rq, 0, sizeof(rq));
rep = parse_reply_in_temp_region(buf, temp, &rq);
if(rep && rq.qtype == wanted_qtype &&
FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) {
/* parsed successfully */
struct ub_packed_rrset_key* answer =
reply_find_answer_rrset(&rq, rep);
if(answer) {
xfr_master_add_addrs(xfr->task_transfer->
lookup_target, answer, wanted_qtype);
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has nodata", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
}
}
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup has no answer", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
}
}
regional_free_all(temp);
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s transfer lookup failed", zname, xfr->task_transfer->lookup_target->host, (xfr->task_transfer->lookup_aaaa?"AAAA":"A"));
}
}
if(xfr->task_transfer->lookup_target->list &&
xfr->task_transfer->lookup_target == xfr_transfer_current_master(xfr))
xfr->task_transfer->scan_addr = xfr->task_transfer->lookup_target->list;
/* move to lookup AAAA after A lookup, move to next hostname lookup,
* or move to fetch the zone, or, if nothing to do, end task_transfer */
xfr_transfer_move_to_next_lookup(xfr, env);
xfr_transfer_nexttarget_or_end(xfr, env);
}
/** check if xfer (AXFR or IXFR) packet is OK.
* return false if we lost connection (SERVFAIL, or unreadable).
* return false if we need to move from IXFR to AXFR, with gonextonfail
* set to false, so the same master is tried again, but with AXFR.
* return true if fine to link into data.
* return true with transferdone=true when the transfer has ended.
*/
static int
check_xfer_packet(sldns_buffer* pkt, struct auth_xfer* xfr,
int* gonextonfail, int* transferdone)
{
uint8_t* wire = sldns_buffer_begin(pkt);
int i;
if(sldns_buffer_limit(pkt) < LDNS_HEADER_SIZE) {
verbose(VERB_ALGO, "xfr to %s failed, packet too small",
xfr->task_transfer->master->host);
return 0;
}
if(!LDNS_QR_WIRE(wire)) {
verbose(VERB_ALGO, "xfr to %s failed, packet has no QR flag",
xfr->task_transfer->master->host);
return 0;
}
if(LDNS_TC_WIRE(wire)) {
verbose(VERB_ALGO, "xfr to %s failed, packet has TC flag",
xfr->task_transfer->master->host);
return 0;
}
/* check ID */
if(LDNS_ID_WIRE(wire) != xfr->task_transfer->id) {
verbose(VERB_ALGO, "xfr to %s failed, packet wrong ID",
xfr->task_transfer->master->host);
return 0;
}
if(LDNS_RCODE_WIRE(wire) != LDNS_RCODE_NOERROR) {
char rcode[32];
sldns_wire2str_rcode_buf((int)LDNS_RCODE_WIRE(wire), rcode,
sizeof(rcode));
/* if we are doing IXFR, check for fallback */
if(xfr->task_transfer->on_ixfr) {
if(LDNS_RCODE_WIRE(wire) == LDNS_RCODE_NOTIMPL ||
LDNS_RCODE_WIRE(wire) == LDNS_RCODE_SERVFAIL ||
LDNS_RCODE_WIRE(wire) == LDNS_RCODE_REFUSED ||
LDNS_RCODE_WIRE(wire) == LDNS_RCODE_FORMERR) {
verbose(VERB_ALGO, "xfr to %s, fallback "
"from IXFR to AXFR (with rcode %s)",
xfr->task_transfer->master->host,
rcode);
xfr->task_transfer->ixfr_fail = 1;
*gonextonfail = 0;
return 0;
}
}
verbose(VERB_ALGO, "xfr to %s failed, packet with rcode %s",
xfr->task_transfer->master->host, rcode);
return 0;
}
if(LDNS_OPCODE_WIRE(wire) != LDNS_PACKET_QUERY) {
verbose(VERB_ALGO, "xfr to %s failed, packet with bad opcode",
xfr->task_transfer->master->host);
return 0;
}
if(LDNS_QDCOUNT(wire) > 1) {
verbose(VERB_ALGO, "xfr to %s failed, packet has qdcount %d",
xfr->task_transfer->master->host,
(int)LDNS_QDCOUNT(wire));
return 0;
}
/* check qname */
sldns_buffer_set_position(pkt, LDNS_HEADER_SIZE);
for(i=0; i<(int)LDNS_QDCOUNT(wire); i++) {
size_t pos = sldns_buffer_position(pkt);
uint16_t qtype, qclass;
if(pkt_dname_len(pkt) == 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"malformed dname",
xfr->task_transfer->master->host);
return 0;
}
if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos),
xfr->name) != 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"wrong qname",
xfr->task_transfer->master->host);
return 0;
}
if(sldns_buffer_remaining(pkt) < 4) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated query RR",
xfr->task_transfer->master->host);
return 0;
}
qtype = sldns_buffer_read_u16(pkt);
qclass = sldns_buffer_read_u16(pkt);
if(qclass != xfr->dclass) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"wrong qclass",
xfr->task_transfer->master->host);
return 0;
}
if(xfr->task_transfer->on_ixfr) {
if(qtype != LDNS_RR_TYPE_IXFR) {
verbose(VERB_ALGO, "xfr to %s failed, packet "
"with wrong qtype, expected IXFR",
xfr->task_transfer->master->host);
return 0;
}
} else {
if(qtype != LDNS_RR_TYPE_AXFR) {
verbose(VERB_ALGO, "xfr to %s failed, packet "
"with wrong qtype, expected AXFR",
xfr->task_transfer->master->host);
return 0;
}
}
}
/* check parse of RRs in packet, store first SOA serial
* to be able to detect last SOA (with that serial) to see if done */
/* also check for IXFR 'zone up to date' reply */
for(i=0; i<(int)LDNS_ANCOUNT(wire); i++) {
size_t pos = sldns_buffer_position(pkt);
uint16_t tp, rdlen;
if(pkt_dname_len(pkt) == 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"malformed dname in answer section",
xfr->task_transfer->master->host);
return 0;
}
if(sldns_buffer_remaining(pkt) < 10) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR",
xfr->task_transfer->master->host);
return 0;
}
tp = sldns_buffer_read_u16(pkt);
(void)sldns_buffer_read_u16(pkt); /* class */
(void)sldns_buffer_read_u32(pkt); /* ttl */
rdlen = sldns_buffer_read_u16(pkt);
if(sldns_buffer_remaining(pkt) < rdlen) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR rdata",
xfr->task_transfer->master->host);
return 0;
}
/* RR parses (haven't checked rdata itself), now look at
* SOA records to see serial number */
if(xfr->task_transfer->rr_scan_num == 0 &&
tp != LDNS_RR_TYPE_SOA) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"malformed zone transfer, no start SOA",
xfr->task_transfer->master->host);
return 0;
}
if(xfr->task_transfer->rr_scan_num == 1 &&
tp != LDNS_RR_TYPE_SOA) {
/* second RR is not a SOA record, this is not an IXFR
* the master is replying with an AXFR */
xfr->task_transfer->on_ixfr_is_axfr = 1;
}
if(tp == LDNS_RR_TYPE_SOA) {
uint32_t serial;
if(rdlen < 22) {
verbose(VERB_ALGO, "xfr to %s failed, packet "
"with SOA with malformed rdata",
xfr->task_transfer->master->host);
return 0;
}
if(dname_pkt_compare(pkt, sldns_buffer_at(pkt, pos),
xfr->name) != 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet "
"with SOA with wrong dname",
xfr->task_transfer->master->host);
return 0;
}
/* read serial number of SOA */
serial = sldns_buffer_read_u32_at(pkt,
sldns_buffer_position(pkt)+rdlen-20);
/* check for IXFR 'zone has SOA x' reply */
if(xfr->task_transfer->on_ixfr &&
xfr->task_transfer->rr_scan_num == 0 &&
LDNS_ANCOUNT(wire)==1) {
verbose(VERB_ALGO, "xfr to %s ended, "
"IXFR reply that zone has serial %u,"
" fallback from IXFR to AXFR",
xfr->task_transfer->master->host,
(unsigned)serial);
xfr->task_transfer->ixfr_fail = 1;
*gonextonfail = 0;
return 0;
}
/* if first SOA, store serial number */
if(xfr->task_transfer->got_xfr_serial == 0) {
xfr->task_transfer->got_xfr_serial = 1;
xfr->task_transfer->incoming_xfr_serial =
serial;
verbose(VERB_ALGO, "xfr %s: contains "
"SOA serial %u",
xfr->task_transfer->master->host,
(unsigned)serial);
/* see if end of AXFR */
} else if(!xfr->task_transfer->on_ixfr ||
xfr->task_transfer->on_ixfr_is_axfr) {
/* second SOA with serial is the end
* for AXFR */
*transferdone = 1;
verbose(VERB_ALGO, "xfr %s: last AXFR packet",
xfr->task_transfer->master->host);
/* for IXFR, count SOA records with that serial */
} else if(xfr->task_transfer->incoming_xfr_serial ==
serial && xfr->task_transfer->got_xfr_serial
== 1) {
xfr->task_transfer->got_xfr_serial++;
/* if not first soa, if serial==firstserial, the
* third time we are at the end, for IXFR */
} else if(xfr->task_transfer->incoming_xfr_serial ==
serial && xfr->task_transfer->got_xfr_serial
== 2) {
verbose(VERB_ALGO, "xfr %s: last IXFR packet",
xfr->task_transfer->master->host);
*transferdone = 1;
/* continue parse check, if that succeeds,
* transfer is done */
}
}
xfr->task_transfer->rr_scan_num++;
/* skip over RR rdata to go to the next RR */
sldns_buffer_skip(pkt, (ssize_t)rdlen);
}
/* check authority section */
/* we skip over the RRs checking packet format */
for(i=0; i<(int)LDNS_NSCOUNT(wire); i++) {
uint16_t rdlen;
if(pkt_dname_len(pkt) == 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"malformed dname in authority section",
xfr->task_transfer->master->host);
return 0;
}
if(sldns_buffer_remaining(pkt) < 10) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR",
xfr->task_transfer->master->host);
return 0;
}
(void)sldns_buffer_read_u16(pkt); /* type */
(void)sldns_buffer_read_u16(pkt); /* class */
(void)sldns_buffer_read_u32(pkt); /* ttl */
rdlen = sldns_buffer_read_u16(pkt);
if(sldns_buffer_remaining(pkt) < rdlen) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR rdata",
xfr->task_transfer->master->host);
return 0;
}
/* skip over RR rdata to go to the next RR */
sldns_buffer_skip(pkt, (ssize_t)rdlen);
}
/* check additional section */
for(i=0; i<(int)LDNS_ARCOUNT(wire); i++) {
uint16_t rdlen;
if(pkt_dname_len(pkt) == 0) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"malformed dname in additional section",
xfr->task_transfer->master->host);
return 0;
}
if(sldns_buffer_remaining(pkt) < 10) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR",
xfr->task_transfer->master->host);
return 0;
}
(void)sldns_buffer_read_u16(pkt); /* type */
(void)sldns_buffer_read_u16(pkt); /* class */
(void)sldns_buffer_read_u32(pkt); /* ttl */
rdlen = sldns_buffer_read_u16(pkt);
if(sldns_buffer_remaining(pkt) < rdlen) {
verbose(VERB_ALGO, "xfr to %s failed, packet with "
"truncated RR rdata",
xfr->task_transfer->master->host);
return 0;
}
/* skip over RR rdata to go to the next RR */
sldns_buffer_skip(pkt, (ssize_t)rdlen);
}
return 1;
}
/** Link the data from this packet into the worklist of transferred data */
static int
xfer_link_data(sldns_buffer* pkt, struct auth_xfer* xfr)
{
/* alloc it */
struct auth_chunk* e;
e = (struct auth_chunk*)calloc(1, sizeof(*e));
if(!e) return 0;
e->next = NULL;
e->len = sldns_buffer_limit(pkt);
e->data = memdup(sldns_buffer_begin(pkt), e->len);
if(!e->data) {
free(e);
return 0;
}
/* alloc succeeded, link into list */
if(!xfr->task_transfer->chunks_first)
xfr->task_transfer->chunks_first = e;
if(xfr->task_transfer->chunks_last)
xfr->task_transfer->chunks_last->next = e;
xfr->task_transfer->chunks_last = e;
return 1;
}
/** task transfer. the list of data is complete. process it and if failed
* move to next master, if succeeded, end the task transfer */
static void
process_list_end_transfer(struct auth_xfer* xfr, struct module_env* env)
{
int ixfr_fail = 0;
if(xfr_process_chunk_list(xfr, env, &ixfr_fail)) {
/* it worked! */
auth_chunks_delete(xfr->task_transfer);
/* we fetched the zone, move to wait task */
xfr_transfer_disown(xfr);
if(xfr->notify_received && (!xfr->notify_has_serial ||
(xfr->notify_has_serial &&
xfr_serial_means_update(xfr, xfr->notify_serial)))) {
uint32_t sr = xfr->notify_serial;
int has_sr = xfr->notify_has_serial;
/* we received a notify while probe/transfer was
* in progress. start a new probe and transfer */
xfr->notify_received = 0;
xfr->notify_has_serial = 0;
xfr->notify_serial = 0;
if(!xfr_start_probe(xfr, env, NULL)) {
/* if we couldn't start it, already in
* progress; restore notify serial,
* while xfr still locked */
xfr->notify_received = 1;
xfr->notify_has_serial = has_sr;
xfr->notify_serial = sr;
lock_basic_unlock(&xfr->lock);
}
return;
} else {
/* pick up the nextprobe task and wait (normail wait time) */
if(xfr->task_nextprobe->worker == NULL)
xfr_set_timeout(xfr, env, 0, 0);
}
lock_basic_unlock(&xfr->lock);
return;
}
/* processing failed */
/* when done, delete data from list */
auth_chunks_delete(xfr->task_transfer);
if(ixfr_fail) {
xfr->task_transfer->ixfr_fail = 1;
} else {
xfr_transfer_nextmaster(xfr);
}
xfr_transfer_nexttarget_or_end(xfr, env);
}
/** callback for the task_transfer timer */
void
auth_xfer_transfer_timer_callback(void* arg)
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
int gonextonfail = 1;
log_assert(xfr->task_transfer);
lock_basic_lock(&xfr->lock);
env = xfr->task_transfer->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return; /* stop on quit */
}
verbose(VERB_ALGO, "xfr stopped, connection timeout to %s",
xfr->task_transfer->master->host);
/* see if IXFR caused the failure, if so, try AXFR */
if(xfr->task_transfer->on_ixfr) {
xfr->task_transfer->ixfr_possible_timeout_count++;
if(xfr->task_transfer->ixfr_possible_timeout_count >=
NUM_TIMEOUTS_FALLBACK_IXFR) {
verbose(VERB_ALGO, "xfr to %s, fallback "
"from IXFR to AXFR (because of timeouts)",
xfr->task_transfer->master->host);
xfr->task_transfer->ixfr_fail = 1;
gonextonfail = 0;
}
}
/* delete transferred data from list */
auth_chunks_delete(xfr->task_transfer);
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
if(gonextonfail)
xfr_transfer_nextmaster(xfr);
xfr_transfer_nexttarget_or_end(xfr, env);
}
/** callback for task_transfer tcp connections */
int
auth_xfer_transfer_tcp_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* ATTR_UNUSED(repinfo))
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
int gonextonfail = 1;
int transferdone = 0;
log_assert(xfr->task_transfer);
lock_basic_lock(&xfr->lock);
env = xfr->task_transfer->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return 0; /* stop on quit */
}
/* stop the timer */
comm_timer_disable(xfr->task_transfer->timer);
if(err != NETEVENT_NOERROR) {
/* connection failed, closed, or timeout */
/* stop this transfer, cleanup
* and continue task_transfer*/
verbose(VERB_ALGO, "xfr stopped, connection lost to %s",
xfr->task_transfer->master->host);
/* see if IXFR caused the failure, if so, try AXFR */
if(xfr->task_transfer->on_ixfr) {
xfr->task_transfer->ixfr_possible_timeout_count++;
if(xfr->task_transfer->ixfr_possible_timeout_count >=
NUM_TIMEOUTS_FALLBACK_IXFR) {
verbose(VERB_ALGO, "xfr to %s, fallback "
"from IXFR to AXFR (because of timeouts)",
xfr->task_transfer->master->host);
xfr->task_transfer->ixfr_fail = 1;
gonextonfail = 0;
}
}
failed:
/* delete transferred data from list */
auth_chunks_delete(xfr->task_transfer);
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
if(gonextonfail)
xfr_transfer_nextmaster(xfr);
xfr_transfer_nexttarget_or_end(xfr, env);
return 0;
}
/* note that IXFR worked without timeout */
if(xfr->task_transfer->on_ixfr)
xfr->task_transfer->ixfr_possible_timeout_count = 0;
/* handle returned packet */
/* if it fails, cleanup and end this transfer */
/* if it needs to fallback from IXFR to AXFR, do that */
if(!check_xfer_packet(c->buffer, xfr, &gonextonfail, &transferdone)) {
goto failed;
}
/* if it is good, link it into the list of data */
/* if the link into list of data fails (malloc fail) cleanup and end */
if(!xfer_link_data(c->buffer, xfr)) {
verbose(VERB_ALGO, "xfr stopped to %s, malloc failed",
xfr->task_transfer->master->host);
goto failed;
}
/* if the transfer is done now, disconnect and process the list */
if(transferdone) {
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
process_list_end_transfer(xfr, env);
return 0;
}
/* if we want to read more messages, setup the commpoint to read
* a DNS packet, and the timeout */
lock_basic_unlock(&xfr->lock);
c->tcp_is_reading = 1;
sldns_buffer_clear(c->buffer);
comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT);
return 0;
}
/** callback for task_transfer http connections */
int
auth_xfer_transfer_http_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* repinfo)
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_transfer);
lock_basic_lock(&xfr->lock);
env = xfr->task_transfer->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return 0; /* stop on quit */
}
verbose(VERB_ALGO, "auth zone transfer http callback");
/* stop the timer */
comm_timer_disable(xfr->task_transfer->timer);
if(err != NETEVENT_NOERROR && err != NETEVENT_DONE) {
/* connection failed, closed, or timeout */
/* stop this transfer, cleanup
* and continue task_transfer*/
verbose(VERB_ALGO, "http stopped, connection lost to %s",
xfr->task_transfer->master->host);
failed:
/* delete transferred data from list */
auth_chunks_delete(xfr->task_transfer);
if(repinfo) repinfo->c = NULL; /* signal cp deleted to
the routine calling this callback */
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
xfr_transfer_nextmaster(xfr);
xfr_transfer_nexttarget_or_end(xfr, env);
return 0;
}
/* if it is good, link it into the list of data */
/* if the link into list of data fails (malloc fail) cleanup and end */
if(sldns_buffer_limit(c->buffer) > 0) {
verbose(VERB_ALGO, "auth zone http queued up %d bytes",
(int)sldns_buffer_limit(c->buffer));
if(!xfer_link_data(c->buffer, xfr)) {
verbose(VERB_ALGO, "http stopped to %s, malloc failed",
xfr->task_transfer->master->host);
goto failed;
}
}
/* if the transfer is done now, disconnect and process the list */
if(err == NETEVENT_DONE) {
if(repinfo) repinfo->c = NULL; /* signal cp deleted to
the routine calling this callback */
comm_point_delete(xfr->task_transfer->cp);
xfr->task_transfer->cp = NULL;
process_list_end_transfer(xfr, env);
return 0;
}
/* if we want to read more messages, setup the commpoint to read
* a DNS packet, and the timeout */
lock_basic_unlock(&xfr->lock);
c->tcp_is_reading = 1;
sldns_buffer_clear(c->buffer);
comm_point_start_listening(c, -1, AUTH_TRANSFER_TIMEOUT);
return 0;
}
/** start transfer task by this worker , xfr is locked. */
static void
xfr_start_transfer(struct auth_xfer* xfr, struct module_env* env,
struct auth_master* master)
{
log_assert(xfr->task_transfer != NULL);
log_assert(xfr->task_transfer->worker == NULL);
log_assert(xfr->task_transfer->chunks_first == NULL);
log_assert(xfr->task_transfer->chunks_last == NULL);
xfr->task_transfer->worker = env->worker;
xfr->task_transfer->env = env;
/* init transfer process */
/* find that master in the transfer's list of masters? */
xfr_transfer_start_list(xfr, master);
/* start lookup for hostnames in transfer master list */
xfr_transfer_start_lookups(xfr);
/* initiate TCP, and set timeout on it */
xfr_transfer_nexttarget_or_end(xfr, env);
}
/** disown task_probe. caller must hold xfr.lock */
static void
xfr_probe_disown(struct auth_xfer* xfr)
{
/* remove timer (from this worker's event base) */
comm_timer_delete(xfr->task_probe->timer);
xfr->task_probe->timer = NULL;
/* remove the commpoint */
comm_point_delete(xfr->task_probe->cp);
xfr->task_probe->cp = NULL;
/* we don't own this item anymore */
xfr->task_probe->worker = NULL;
xfr->task_probe->env = NULL;
}
/** send the UDP probe to the master, this is part of task_probe */
static int
xfr_probe_send_probe(struct auth_xfer* xfr, struct module_env* env,
int timeout)
{
struct sockaddr_storage addr;
socklen_t addrlen = 0;
struct timeval t;
/* pick master */
struct auth_master* master = xfr_probe_current_master(xfr);
char *auth_name = NULL;
if(!master) return 0;
if(master->allow_notify) return 0; /* only for notify */
if(master->http) return 0; /* only masters get SOA UDP probe,
not urls, if those are in this list */
/* get master addr */
if(xfr->task_probe->scan_addr) {
addrlen = xfr->task_probe->scan_addr->addrlen;
memmove(&addr, &xfr->task_probe->scan_addr->addr, addrlen);
} else {
if(!authextstrtoaddr(master->host, &addr, &addrlen, &auth_name)) {
/* the ones that are not in addr format are supposed
* to be looked up. The lookup has failed however,
* so skip them */
char zname[255+1];
dname_str(xfr->name, zname);
log_err("%s: failed lookup, cannot probe to master %s",
zname, master->host);
return 0;
}
if (auth_name != NULL) {
if (addr.ss_family == AF_INET
&& (int)ntohs(((struct sockaddr_in *)&addr)->sin_port)
== env->cfg->ssl_port)
((struct sockaddr_in *)&addr)->sin_port
= htons((uint16_t)env->cfg->port);
else if (addr.ss_family == AF_INET6
&& (int)ntohs(((struct sockaddr_in6 *)&addr)->sin6_port)
== env->cfg->ssl_port)
((struct sockaddr_in6 *)&addr)->sin6_port
= htons((uint16_t)env->cfg->port);
}
}
/* create packet */
/* create new ID for new probes, but not on timeout retries,
* this means we'll accept replies to previous retries to same ip */
if(timeout == AUTH_PROBE_TIMEOUT)
xfr->task_probe->id = (uint16_t)(ub_random(env->rnd)&0xffff);
xfr_create_soa_probe_packet(xfr, env->scratch_buffer,
xfr->task_probe->id);
/* we need to remove the cp if we have a different ip4/ip6 type now */
if(xfr->task_probe->cp &&
((xfr->task_probe->cp_is_ip6 && !addr_is_ip6(&addr, addrlen)) ||
(!xfr->task_probe->cp_is_ip6 && addr_is_ip6(&addr, addrlen)))
) {
comm_point_delete(xfr->task_probe->cp);
xfr->task_probe->cp = NULL;
}
if(!xfr->task_probe->cp) {
if(addr_is_ip6(&addr, addrlen))
xfr->task_probe->cp_is_ip6 = 1;
else xfr->task_probe->cp_is_ip6 = 0;
xfr->task_probe->cp = outnet_comm_point_for_udp(env->outnet,
auth_xfer_probe_udp_callback, xfr, &addr, addrlen);
if(!xfr->task_probe->cp) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "cannot create udp cp for "
"probe %s to %s", zname, as);
return 0;
}
}
if(!xfr->task_probe->timer) {
xfr->task_probe->timer = comm_timer_create(env->worker_base,
auth_xfer_probe_timer_callback, xfr);
if(!xfr->task_probe->timer) {
log_err("malloc failure");
return 0;
}
}
/* send udp packet */
if(!comm_point_send_udp_msg(xfr->task_probe->cp, env->scratch_buffer,
(struct sockaddr*)&addr, addrlen, 0)) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "failed to send soa probe for %s to %s",
zname, as);
return 0;
}
if(verbosity >= VERB_ALGO) {
char zname[255+1], as[256];
dname_str(xfr->name, zname);
addr_to_str(&addr, addrlen, as, sizeof(as));
verbose(VERB_ALGO, "auth zone %s soa probe sent to %s", zname,
as);
}
xfr->task_probe->timeout = timeout;
#ifndef S_SPLINT_S
t.tv_sec = timeout/1000;
t.tv_usec = (timeout%1000)*1000;
#endif
comm_timer_set(xfr->task_probe->timer, &t);
return 1;
}
/** callback for task_probe timer */
void
auth_xfer_probe_timer_callback(void* arg)
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_probe);
lock_basic_lock(&xfr->lock);
env = xfr->task_probe->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return; /* stop on quit */
}
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s soa probe timeout", zname);
}
if(xfr->task_probe->timeout <= AUTH_PROBE_TIMEOUT_STOP) {
/* try again with bigger timeout */
if(xfr_probe_send_probe(xfr, env, xfr->task_probe->timeout*2)) {
lock_basic_unlock(&xfr->lock);
return;
}
}
/* delete commpoint so a new one is created, with a fresh port nr */
comm_point_delete(xfr->task_probe->cp);
xfr->task_probe->cp = NULL;
/* too many timeouts (or fail to send), move to next or end */
xfr_probe_nextmaster(xfr);
xfr_probe_send_or_end(xfr, env);
}
/** callback for task_probe udp packets */
int
auth_xfer_probe_udp_callback(struct comm_point* c, void* arg, int err,
struct comm_reply* repinfo)
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_probe);
lock_basic_lock(&xfr->lock);
env = xfr->task_probe->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return 0; /* stop on quit */
}
/* the comm_point_udp_callback is in a for loop for NUM_UDP_PER_SELECT
* and we set rep.c=NULL to stop if from looking inside the commpoint*/
repinfo->c = NULL;
/* stop the timer */
comm_timer_disable(xfr->task_probe->timer);
/* see if we got a packet and what that means */
if(err == NETEVENT_NOERROR) {
uint32_t serial = 0;
if(check_packet_ok(c->buffer, LDNS_RR_TYPE_SOA, xfr,
&serial)) {
/* successful lookup */
if(verbosity >= VERB_ALGO) {
char buf[256];
dname_str(xfr->name, buf);
verbose(VERB_ALGO, "auth zone %s: soa probe "
"serial is %u", buf, (unsigned)serial);
}
/* see if this serial indicates that the zone has
* to be updated */
if(xfr_serial_means_update(xfr, serial)) {
/* if updated, start the transfer task, if needed */
verbose(VERB_ALGO, "auth_zone updated, start transfer");
if(xfr->task_transfer->worker == NULL) {
struct auth_master* master =
xfr_probe_current_master(xfr);
/* if we have download URLs use them
* in preference to this master we
* just probed the SOA from */
if(xfr->task_transfer->masters &&
xfr->task_transfer->masters->http)
master = NULL;
xfr_probe_disown(xfr);
xfr_start_transfer(xfr, env, master);
return 0;
}
/* other tasks are running, we don't do this anymore */
xfr_probe_disown(xfr);
lock_basic_unlock(&xfr->lock);
/* return, we don't sent a reply to this udp packet,
* and we setup the tasks to do next */
return 0;
} else {
verbose(VERB_ALGO, "auth_zone master reports unchanged soa serial");
/* we if cannot find updates amongst the
* masters, this means we then have a new lease
* on the zone */
xfr->task_probe->have_new_lease = 1;
}
} else {
if(verbosity >= VERB_ALGO) {
char buf[256];
dname_str(xfr->name, buf);
verbose(VERB_ALGO, "auth zone %s: bad reply to soa probe", buf);
}
}
} else {
if(verbosity >= VERB_ALGO) {
char buf[256];
dname_str(xfr->name, buf);
verbose(VERB_ALGO, "auth zone %s: soa probe failed", buf);
}
}
/* failed lookup or not an update */
/* delete commpoint so a new one is created, with a fresh port nr */
comm_point_delete(xfr->task_probe->cp);
xfr->task_probe->cp = NULL;
/* if the result was not a successfull probe, we need
* to send the next one */
xfr_probe_nextmaster(xfr);
xfr_probe_send_or_end(xfr, env);
return 0;
}
/** lookup a host name for its addresses, if needed */
static int
xfr_probe_lookup_host(struct auth_xfer* xfr, struct module_env* env)
{
struct sockaddr_storage addr;
socklen_t addrlen = 0;
struct auth_master* master = xfr->task_probe->lookup_target;
struct query_info qinfo;
uint16_t qflags = BIT_RD;
uint8_t dname[LDNS_MAX_DOMAINLEN+1];
struct edns_data edns;
sldns_buffer* buf = env->scratch_buffer;
if(!master) return 0;
if(extstrtoaddr(master->host, &addr, &addrlen)) {
/* not needed, host is in IP addr format */
return 0;
}
if(master->allow_notify && !master->http &&
strchr(master->host, '/') != NULL &&
strchr(master->host, '/') == strrchr(master->host, '/')) {
return 0; /* is IP/prefix format, not something to look up */
}
/* use mesh_new_callback to probe for non-addr hosts,
* and then wait for them to be looked up (in cache, or query) */
qinfo.qname_len = sizeof(dname);
if(sldns_str2wire_dname_buf(master->host, dname, &qinfo.qname_len)
!= 0) {
log_err("cannot parse host name of master %s", master->host);
return 0;
}
qinfo.qname = dname;
qinfo.qclass = xfr->dclass;
qinfo.qtype = LDNS_RR_TYPE_A;
if(xfr->task_probe->lookup_aaaa)
qinfo.qtype = LDNS_RR_TYPE_AAAA;
qinfo.local_alias = NULL;
if(verbosity >= VERB_ALGO) {
char buf1[512];
char buf2[LDNS_MAX_DOMAINLEN+1];
dname_str(xfr->name, buf2);
snprintf(buf1, sizeof(buf1), "auth zone %s: master lookup"
" for task_probe", buf2);
log_query_info(VERB_ALGO, buf1, &qinfo);
}
edns.edns_present = 1;
edns.ext_rcode = 0;
edns.edns_version = 0;
edns.bits = EDNS_DO;
edns.opt_list = NULL;
if(sldns_buffer_capacity(buf) < 65535)
edns.udp_size = (uint16_t)sldns_buffer_capacity(buf);
else edns.udp_size = 65535;
/* unlock xfr during mesh_new_callback() because the callback can be
* called straight away */
lock_basic_unlock(&xfr->lock);
if(!mesh_new_callback(env->mesh, &qinfo, qflags, &edns, buf, 0,
&auth_xfer_probe_lookup_callback, xfr)) {
lock_basic_lock(&xfr->lock);
log_err("out of memory lookup up master %s", master->host);
return 0;
}
lock_basic_lock(&xfr->lock);
return 1;
}
/** move to sending the probe packets, next if fails. task_probe */
static void
xfr_probe_send_or_end(struct auth_xfer* xfr, struct module_env* env)
{
/* are we doing hostname lookups? */
while(xfr->task_probe->lookup_target) {
if(xfr_probe_lookup_host(xfr, env)) {
/* wait for lookup to finish,
* note that the hostname may be in unbound's cache
* and we may then get an instant cache response,
* and that calls the callback just like a full
* lookup and lookup failures also call callback */
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s probe next target lookup", zname);
}
lock_basic_unlock(&xfr->lock);
return;
}
xfr_probe_move_to_next_lookup(xfr, env);
}
/* probe of list has ended. Create or refresh the list of of
* allow_notify addrs */
probe_copy_masters_for_allow_notify(xfr);
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s probe: notify addrs updated", zname);
}
if(xfr->task_probe->only_lookup) {
/* only wanted lookups for copy, stop probe and start wait */
xfr->task_probe->only_lookup = 0;
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s probe: finished only_lookup", zname);
}
xfr_probe_disown(xfr);
if(xfr->task_nextprobe->worker == NULL)
xfr_set_timeout(xfr, env, 0, 0);
lock_basic_unlock(&xfr->lock);
return;
}
/* send probe packets */
while(!xfr_probe_end_of_list(xfr)) {
if(xfr_probe_send_probe(xfr, env, AUTH_PROBE_TIMEOUT)) {
/* successfully sent probe, wait for callback */
lock_basic_unlock(&xfr->lock);
return;
}
/* failed to send probe, next master */
xfr_probe_nextmaster(xfr);
}
/* done with probe sequence, wait */
if(xfr->task_probe->have_new_lease) {
/* if zone not updated, start the wait timer again */
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth_zone %s unchanged, new lease, wait", zname);
}
xfr_probe_disown(xfr);
if(xfr->have_zone)
xfr->lease_time = *env->now;
if(xfr->task_nextprobe->worker == NULL)
xfr_set_timeout(xfr, env, 0, 0);
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s soa probe failed, wait to retry", zname);
}
/* we failed to send this as well, move to the wait task,
* use the shorter retry timeout */
xfr_probe_disown(xfr);
/* pick up the nextprobe task and wait */
if(xfr->task_nextprobe->worker == NULL)
xfr_set_timeout(xfr, env, 1, 0);
}
lock_basic_unlock(&xfr->lock);
}
/** callback for task_probe lookup of host name, of A or AAAA */
void auth_xfer_probe_lookup_callback(void* arg, int rcode, sldns_buffer* buf,
enum sec_status ATTR_UNUSED(sec), char* ATTR_UNUSED(why_bogus),
int ATTR_UNUSED(was_ratelimited))
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_probe);
lock_basic_lock(&xfr->lock);
env = xfr->task_probe->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return; /* stop on quit */
}
/* process result */
if(rcode == LDNS_RCODE_NOERROR) {
uint16_t wanted_qtype = LDNS_RR_TYPE_A;
struct regional* temp = env->scratch;
struct query_info rq;
struct reply_info* rep;
if(xfr->task_probe->lookup_aaaa)
wanted_qtype = LDNS_RR_TYPE_AAAA;
memset(&rq, 0, sizeof(rq));
rep = parse_reply_in_temp_region(buf, temp, &rq);
if(rep && rq.qtype == wanted_qtype &&
FLAGS_GET_RCODE(rep->flags) == LDNS_RCODE_NOERROR) {
/* parsed successfully */
struct ub_packed_rrset_key* answer =
reply_find_answer_rrset(&rq, rep);
if(answer) {
xfr_master_add_addrs(xfr->task_probe->
lookup_target, answer, wanted_qtype);
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has nodata", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
}
}
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup has no address", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
}
}
regional_free_all(temp);
} else {
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s host %s type %s probe lookup failed", zname, xfr->task_probe->lookup_target->host, (xfr->task_probe->lookup_aaaa?"AAAA":"A"));
}
}
if(xfr->task_probe->lookup_target->list &&
xfr->task_probe->lookup_target == xfr_probe_current_master(xfr))
xfr->task_probe->scan_addr = xfr->task_probe->lookup_target->list;
/* move to lookup AAAA after A lookup, move to next hostname lookup,
* or move to send the probes, or, if nothing to do, end task_probe */
xfr_probe_move_to_next_lookup(xfr, env);
xfr_probe_send_or_end(xfr, env);
}
/** disown task_nextprobe. caller must hold xfr.lock */
static void
xfr_nextprobe_disown(struct auth_xfer* xfr)
{
/* delete the timer, because the next worker to pick this up may
* not have the same event base */
comm_timer_delete(xfr->task_nextprobe->timer);
xfr->task_nextprobe->timer = NULL;
xfr->task_nextprobe->next_probe = 0;
/* we don't own this item anymore */
xfr->task_nextprobe->worker = NULL;
xfr->task_nextprobe->env = NULL;
}
/** xfer nextprobe timeout callback, this is part of task_nextprobe */
void
auth_xfer_timer(void* arg)
{
struct auth_xfer* xfr = (struct auth_xfer*)arg;
struct module_env* env;
log_assert(xfr->task_nextprobe);
lock_basic_lock(&xfr->lock);
env = xfr->task_nextprobe->env;
if(!env || env->outnet->want_to_quit) {
lock_basic_unlock(&xfr->lock);
return; /* stop on quit */
}
/* see if zone has expired, and if so, also set auth_zone expired */
if(xfr->have_zone && !xfr->zone_expired &&
*env->now >= xfr->lease_time + xfr->expiry) {
lock_basic_unlock(&xfr->lock);
auth_xfer_set_expired(xfr, env, 1);
lock_basic_lock(&xfr->lock);
}
xfr_nextprobe_disown(xfr);
if(!xfr_start_probe(xfr, env, NULL)) {
/* not started because already in progress */
lock_basic_unlock(&xfr->lock);
}
}
/** return true if there are probe (SOA UDP query) targets in the master list*/
static int
have_probe_targets(struct auth_master* list)
{
struct auth_master* p;
for(p=list; p; p = p->next) {
if(!p->allow_notify && p->host)
return 1;
}
return 0;
}
/** start task_probe if possible, if no masters for probe start task_transfer
* returns true if task has been started, and false if the task is already
* in progress. */
static int
xfr_start_probe(struct auth_xfer* xfr, struct module_env* env,
struct auth_master* spec)
{
/* see if we need to start a probe (or maybe it is already in
* progress (due to notify)) */
if(xfr->task_probe->worker == NULL) {
if(!have_probe_targets(xfr->task_probe->masters) &&
!(xfr->task_probe->only_lookup &&
xfr->task_probe->masters != NULL)) {
/* useless to pick up task_probe, no masters to
* probe. Instead attempt to pick up task transfer */
if(xfr->task_transfer->worker == NULL) {
xfr_start_transfer(xfr, env, spec);
return 1;
}
/* task transfer already in progress */
return 0;
}
/* pick up the probe task ourselves */
xfr->task_probe->worker = env->worker;
xfr->task_probe->env = env;
xfr->task_probe->cp = NULL;
/* start the task */
/* have not seen a new lease yet, this scan */
xfr->task_probe->have_new_lease = 0;
/* if this was a timeout, no specific first master to scan */
/* otherwise, spec is nonNULL the notified master, scan
* first and also transfer first from it */
xfr_probe_start_list(xfr, spec);
/* setup to start the lookup of hostnames of masters afresh */
xfr_probe_start_lookups(xfr);
/* send the probe packet or next send, or end task */
xfr_probe_send_or_end(xfr, env);
return 1;
}
return 0;
}
/** for task_nextprobe.
* determine next timeout for auth_xfer. Also (re)sets timer.
* @param xfr: task structure
* @param env: module environment, with worker and time.
* @param failure: set true if timer should be set for failure retry.
* @param lookup_only: only perform lookups when timer done, 0 sec timeout
*/
static void
xfr_set_timeout(struct auth_xfer* xfr, struct module_env* env,
int failure, int lookup_only)
{
struct timeval tv;
log_assert(xfr->task_nextprobe != NULL);
log_assert(xfr->task_nextprobe->worker == NULL ||
xfr->task_nextprobe->worker == env->worker);
/* normally, nextprobe = startoflease + refresh,
* but if expiry is sooner, use that one.
* after a failure, use the retry timer instead. */
xfr->task_nextprobe->next_probe = *env->now;
if(xfr->lease_time && !failure)
xfr->task_nextprobe->next_probe = xfr->lease_time;
if(!failure) {
xfr->task_nextprobe->backoff = 0;
} else {
if(xfr->task_nextprobe->backoff == 0)
xfr->task_nextprobe->backoff = 3;
else xfr->task_nextprobe->backoff *= 2;
if(xfr->task_nextprobe->backoff > AUTH_TRANSFER_MAX_BACKOFF)
xfr->task_nextprobe->backoff =
AUTH_TRANSFER_MAX_BACKOFF;
}
if(xfr->have_zone) {
time_t wait = xfr->refresh;
if(failure) wait = xfr->retry;
if(xfr->expiry < wait)
xfr->task_nextprobe->next_probe += xfr->expiry;
else xfr->task_nextprobe->next_probe += wait;
if(failure)
xfr->task_nextprobe->next_probe +=
xfr->task_nextprobe->backoff;
/* put the timer exactly on expiry, if possible */
if(xfr->lease_time && xfr->lease_time+xfr->expiry <
xfr->task_nextprobe->next_probe &&
xfr->lease_time+xfr->expiry > *env->now)
xfr->task_nextprobe->next_probe =
xfr->lease_time+xfr->expiry;
} else {
xfr->task_nextprobe->next_probe +=
xfr->task_nextprobe->backoff;
}
if(!xfr->task_nextprobe->timer) {
xfr->task_nextprobe->timer = comm_timer_create(
env->worker_base, auth_xfer_timer, xfr);
if(!xfr->task_nextprobe->timer) {
/* failed to malloc memory. likely zone transfer
* also fails for that. skip the timeout */
char zname[255+1];
dname_str(xfr->name, zname);
log_err("cannot allocate timer, no refresh for %s",
zname);
return;
}
}
xfr->task_nextprobe->worker = env->worker;
xfr->task_nextprobe->env = env;
if(*(xfr->task_nextprobe->env->now) <= xfr->task_nextprobe->next_probe)
tv.tv_sec = xfr->task_nextprobe->next_probe -
*(xfr->task_nextprobe->env->now);
else tv.tv_sec = 0;
if(tv.tv_sec != 0 && lookup_only && xfr->task_probe->masters) {
/* don't lookup_only, if lookup timeout is 0 anyway,
* or if we don't have masters to lookup */
tv.tv_sec = 0;
if(xfr->task_probe->worker == NULL)
xfr->task_probe->only_lookup = 1;
}
if(verbosity >= VERB_ALGO) {
char zname[255+1];
dname_str(xfr->name, zname);
verbose(VERB_ALGO, "auth zone %s timeout in %d seconds",
zname, (int)tv.tv_sec);
}
tv.tv_usec = 0;
comm_timer_set(xfr->task_nextprobe->timer, &tv);
}
/** initial pick up of worker timeouts, ties events to worker event loop */
void
auth_xfer_pickup_initial(struct auth_zones* az, struct module_env* env)
{
struct auth_xfer* x;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(x, struct auth_xfer*, &az->xtree) {
lock_basic_lock(&x->lock);
/* set lease_time, because we now have timestamp in env,
* (not earlier during startup and apply_cfg), and this
* notes the start time when the data was acquired */
if(x->have_zone)
x->lease_time = *env->now;
if(x->task_nextprobe && x->task_nextprobe->worker == NULL) {
xfr_set_timeout(x, env, 0, 1);
}
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&az->lock);
}
void auth_zones_cleanup(struct auth_zones* az)
{
struct auth_xfer* x;
lock_rw_wrlock(&az->lock);
RBTREE_FOR(x, struct auth_xfer*, &az->xtree) {
lock_basic_lock(&x->lock);
if(x->task_nextprobe && x->task_nextprobe->worker != NULL) {
xfr_nextprobe_disown(x);
}
if(x->task_probe && x->task_probe->worker != NULL) {
xfr_probe_disown(x);
}
if(x->task_transfer && x->task_transfer->worker != NULL) {
auth_chunks_delete(x->task_transfer);
xfr_transfer_disown(x);
}
lock_basic_unlock(&x->lock);
}
lock_rw_unlock(&az->lock);
}
/**
* malloc the xfer and tasks
* @param z: auth_zone with name of zone.
*/
static struct auth_xfer*
auth_xfer_new(struct auth_zone* z)
{
struct auth_xfer* xfr;
xfr = (struct auth_xfer*)calloc(1, sizeof(*xfr));
if(!xfr) return NULL;
xfr->name = memdup(z->name, z->namelen);
if(!xfr->name) {
free(xfr);
return NULL;
}
xfr->node.key = xfr;
xfr->namelen = z->namelen;
xfr->namelabs = z->namelabs;
xfr->dclass = z->dclass;
xfr->task_nextprobe = (struct auth_nextprobe*)calloc(1,
sizeof(struct auth_nextprobe));
if(!xfr->task_nextprobe) {
free(xfr->name);
free(xfr);
return NULL;
}
xfr->task_probe = (struct auth_probe*)calloc(1,
sizeof(struct auth_probe));
if(!xfr->task_probe) {
free(xfr->task_nextprobe);
free(xfr->name);
free(xfr);
return NULL;
}
xfr->task_transfer = (struct auth_transfer*)calloc(1,
sizeof(struct auth_transfer));
if(!xfr->task_transfer) {
free(xfr->task_probe);
free(xfr->task_nextprobe);
free(xfr->name);
free(xfr);
return NULL;
}
lock_basic_init(&xfr->lock);
lock_protect(&xfr->lock, &xfr->name, sizeof(xfr->name));
lock_protect(&xfr->lock, &xfr->namelen, sizeof(xfr->namelen));
lock_protect(&xfr->lock, xfr->name, xfr->namelen);
lock_protect(&xfr->lock, &xfr->namelabs, sizeof(xfr->namelabs));
lock_protect(&xfr->lock, &xfr->dclass, sizeof(xfr->dclass));
lock_protect(&xfr->lock, &xfr->notify_received, sizeof(xfr->notify_received));
lock_protect(&xfr->lock, &xfr->notify_serial, sizeof(xfr->notify_serial));
lock_protect(&xfr->lock, &xfr->zone_expired, sizeof(xfr->zone_expired));
lock_protect(&xfr->lock, &xfr->have_zone, sizeof(xfr->have_zone));
lock_protect(&xfr->lock, &xfr->serial, sizeof(xfr->serial));
lock_protect(&xfr->lock, &xfr->retry, sizeof(xfr->retry));
lock_protect(&xfr->lock, &xfr->refresh, sizeof(xfr->refresh));
lock_protect(&xfr->lock, &xfr->expiry, sizeof(xfr->expiry));
lock_protect(&xfr->lock, &xfr->lease_time, sizeof(xfr->lease_time));
lock_protect(&xfr->lock, &xfr->task_nextprobe->worker,
sizeof(xfr->task_nextprobe->worker));
lock_protect(&xfr->lock, &xfr->task_probe->worker,
sizeof(xfr->task_probe->worker));
lock_protect(&xfr->lock, &xfr->task_transfer->worker,
sizeof(xfr->task_transfer->worker));
lock_basic_lock(&xfr->lock);
return xfr;
}
/** Create auth_xfer structure.
* This populates the have_zone, soa values, and so on times.
* and sets the timeout, if a zone transfer is needed a short timeout is set.
* For that the auth_zone itself must exist (and read in zonefile)
* returns false on alloc failure. */
struct auth_xfer*
auth_xfer_create(struct auth_zones* az, struct auth_zone* z)
{
struct auth_xfer* xfr;
/* malloc it */
xfr = auth_xfer_new(z);
if(!xfr) {
log_err("malloc failure");
return NULL;
}
/* insert in tree */
(void)rbtree_insert(&az->xtree, &xfr->node);
return xfr;
}
/** create new auth_master structure */
static struct auth_master*
auth_master_new(struct auth_master*** list)
{
struct auth_master *m;
m = (struct auth_master*)calloc(1, sizeof(*m));
if(!m) {
log_err("malloc failure");
return NULL;
}
/* set first pointer to m, or next pointer of previous element to m */
(**list) = m;
/* store m's next pointer as future point to store at */
(*list) = &(m->next);
return m;
}
/** dup_prefix : create string from initial part of other string, malloced */
static char*
dup_prefix(char* str, size_t num)
{
char* result;
size_t len = strlen(str);
if(len < num) num = len; /* not more than strlen */
result = (char*)malloc(num+1);
if(!result) {
log_err("malloc failure");
return result;
}
memmove(result, str, num);
result[num] = 0;
return result;
}
/** dup string and print error on error */
static char*
dup_all(char* str)
{
char* result = strdup(str);
if(!result) {
log_err("malloc failure");
return NULL;
}
return result;
}
/** find first of two characters */
static char*
str_find_first_of_chars(char* s, char a, char b)
{
char* ra = strchr(s, a);
char* rb = strchr(s, b);
if(!ra) return rb;
if(!rb) return ra;
if(ra < rb) return ra;
return rb;
}
/** parse URL into host and file parts, false on malloc or parse error */
static int
parse_url(char* url, char** host, char** file, int* port, int* ssl)
{
char* p = url;
/* parse http://www.example.com/file.htm
* or http://127.0.0.1 (index.html)
* or https://[::1@1234]/a/b/c/d */
*ssl = 1;
*port = AUTH_HTTPS_PORT;
/* parse http:// or https:// */
if(strncmp(p, "http://", 7) == 0) {
p += 7;
*ssl = 0;
*port = AUTH_HTTP_PORT;
} else if(strncmp(p, "https://", 8) == 0) {
p += 8;
} else if(strstr(p, "://") && strchr(p, '/') > strstr(p, "://") &&
strchr(p, ':') >= strstr(p, "://")) {
char* uri = dup_prefix(p, (size_t)(strstr(p, "://")-p));
log_err("protocol %s:// not supported (for url %s)",
uri?uri:"", p);
free(uri);
return 0;
}
/* parse hostname part */
if(p[0] == '[') {
char* end = strchr(p, ']');
p++; /* skip over [ */
if(end) {
*host = dup_prefix(p, (size_t)(end-p));
if(!*host) return 0;
p = end+1; /* skip over ] */
} else {
*host = dup_all(p);
if(!*host) return 0;
p = end;
}
} else {
char* end = str_find_first_of_chars(p, ':', '/');
if(end) {
*host = dup_prefix(p, (size_t)(end-p));
if(!*host) return 0;
} else {
*host = dup_all(p);
if(!*host) return 0;
}
p = end; /* at next : or / or NULL */
}
/* parse port number */
if(p && p[0] == ':') {
char* end = NULL;
*port = strtol(p+1, &end, 10);
p = end;
}
/* parse filename part */
while(p && *p == '/')
p++;
if(!p || p[0] == 0)
*file = strdup("index.html");
else *file = strdup(p);
if(!*file) {
log_err("malloc failure");
return 0;
}
return 1;
}
int
xfer_set_masters(struct auth_master** list, struct config_auth* c,
int with_http)
{
struct auth_master* m;
struct config_strlist* p;
/* list points to the first, or next pointer for the new element */
while(*list) {
list = &( (*list)->next );
}
if(with_http)
for(p = c->urls; p; p = p->next) {
m = auth_master_new(&list);
m->http = 1;
if(!parse_url(p->str, &m->host, &m->file, &m->port, &m->ssl))
return 0;
}
for(p = c->masters; p; p = p->next) {
m = auth_master_new(&list);
m->ixfr = 1; /* this flag is not configurable */
m->host = strdup(p->str);
if(!m->host) {
log_err("malloc failure");
return 0;
}
}
for(p = c->allow_notify; p; p = p->next) {
m = auth_master_new(&list);
m->allow_notify = 1;
m->host = strdup(p->str);
if(!m->host) {
log_err("malloc failure");
return 0;
}
}
return 1;
}
#define SERIAL_BITS 32
int
compare_serial(uint32_t a, uint32_t b)
{
const uint32_t cutoff = ((uint32_t) 1 << (SERIAL_BITS - 1));
if (a == b) {
return 0;
} else if ((a < b && b - a < cutoff) || (a > b && a - b > cutoff)) {
return -1;
} else {
return 1;
}
}
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