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freebsd-nq/contrib/bind9/lib/dns/message.c
Doug Barton 5143adb549 Update to BIND 9.6.3, the latest from ISC on the 9.6 branch. 
All 9.6 users with DNSSEC validation enabled should upgrade to this
version, or the latest version in the 9.7 branch, prior to 2011-03-31
in order to avoid validation failures for names in .COM as described
here:

https://www.isc.org/announcement/bind-9-dnssec-validation-fails-new-ds-record

In addition the fixes for this and other bugs, there are also the
following:

  * Various fixes to kerberos support, including GSS-TSIG
  * Various fixes to avoid leaking memory, and to problems that could
    prevent a clean shutdown of named
2011-02-06 22:46:07 +00:00

3395 lines
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/*
* Copyright (C) 2004-2010 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: message.c,v 1.245.50.7 2010-06-03 05:29:03 marka Exp $ */
/*! \file */
/***
*** Imports
***/
#include <config.h>
#include <ctype.h>
#include <isc/buffer.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h> /* Required for HP/UX (and others?) */
#include <isc/util.h>
#include <dns/dnssec.h>
#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dns/masterdump.h>
#include <dns/message.h>
#include <dns/opcode.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/result.h>
#include <dns/tsig.h>
#include <dns/view.h>
#ifdef SKAN_MSG_DEBUG
static void
hexdump(const char *msg, const char *msg2, void *base, size_t len) {
unsigned char *p;
unsigned int cnt;
p = base;
cnt = 0;
printf("*** %s [%s] (%u bytes @ %p)\n", msg, msg2, len, base);
while (cnt < len) {
if (cnt % 16 == 0)
printf("%p: ", p);
else if (cnt % 8 == 0)
printf(" |");
printf(" %02x %c", *p, (isprint(*p) ? *p : ' '));
p++;
cnt++;
if (cnt % 16 == 0)
printf("\n");
}
if (cnt % 16 != 0)
printf("\n");
}
#endif
#define DNS_MESSAGE_OPCODE_MASK 0x7800U
#define DNS_MESSAGE_OPCODE_SHIFT 11
#define DNS_MESSAGE_RCODE_MASK 0x000fU
#define DNS_MESSAGE_FLAG_MASK 0x8ff0U
#define DNS_MESSAGE_EDNSRCODE_MASK 0xff000000U
#define DNS_MESSAGE_EDNSRCODE_SHIFT 24
#define DNS_MESSAGE_EDNSVERSION_MASK 0x00ff0000U
#define DNS_MESSAGE_EDNSVERSION_SHIFT 16
#define VALID_NAMED_SECTION(s) (((s) > DNS_SECTION_ANY) \
&& ((s) < DNS_SECTION_MAX))
#define VALID_SECTION(s) (((s) >= DNS_SECTION_ANY) \
&& ((s) < DNS_SECTION_MAX))
#define ADD_STRING(b, s) {if (strlen(s) >= \
isc_buffer_availablelength(b)) \
return(ISC_R_NOSPACE); else \
isc_buffer_putstr(b, s);}
#define VALID_PSEUDOSECTION(s) (((s) >= DNS_PSEUDOSECTION_ANY) \
&& ((s) < DNS_PSEUDOSECTION_MAX))
#define OPTOUT(x) (((x)->attributes & DNS_RDATASETATTR_OPTOUT) != 0)
/*%
* This is the size of each individual scratchpad buffer, and the numbers
* of various block allocations used within the server.
* XXXMLG These should come from a config setting.
*/
#define SCRATCHPAD_SIZE 512
#define NAME_COUNT 8
#define OFFSET_COUNT 4
#define RDATA_COUNT 8
#define RDATALIST_COUNT 8
#define RDATASET_COUNT RDATALIST_COUNT
/*%
* Text representation of the different items, for message_totext
* functions.
*/
static const char *sectiontext[] = {
"QUESTION",
"ANSWER",
"AUTHORITY",
"ADDITIONAL"
};
static const char *updsectiontext[] = {
"ZONE",
"PREREQUISITE",
"UPDATE",
"ADDITIONAL"
};
static const char *opcodetext[] = {
"QUERY",
"IQUERY",
"STATUS",
"RESERVED3",
"NOTIFY",
"UPDATE",
"RESERVED6",
"RESERVED7",
"RESERVED8",
"RESERVED9",
"RESERVED10",
"RESERVED11",
"RESERVED12",
"RESERVED13",
"RESERVED14",
"RESERVED15"
};
static const char *rcodetext[] = {
"NOERROR",
"FORMERR",
"SERVFAIL",
"NXDOMAIN",
"NOTIMP",
"REFUSED",
"YXDOMAIN",
"YXRRSET",
"NXRRSET",
"NOTAUTH",
"NOTZONE",
"RESERVED11",
"RESERVED12",
"RESERVED13",
"RESERVED14",
"RESERVED15",
"BADVERS"
};
/*%
* "helper" type, which consists of a block of some type, and is linkable.
* For it to work, sizeof(dns_msgblock_t) must be a multiple of the pointer
* size, or the allocated elements will not be aligned correctly.
*/
struct dns_msgblock {
unsigned int count;
unsigned int remaining;
ISC_LINK(dns_msgblock_t) link;
}; /* dynamically sized */
static inline dns_msgblock_t *
msgblock_allocate(isc_mem_t *, unsigned int, unsigned int);
#define msgblock_get(block, type) \
((type *)msgblock_internalget(block, sizeof(type)))
static inline void *
msgblock_internalget(dns_msgblock_t *, unsigned int);
static inline void
msgblock_reset(dns_msgblock_t *);
static inline void
msgblock_free(isc_mem_t *, dns_msgblock_t *, unsigned int);
/*
* Allocate a new dns_msgblock_t, and return a pointer to it. If no memory
* is free, return NULL.
*/
static inline dns_msgblock_t *
msgblock_allocate(isc_mem_t *mctx, unsigned int sizeof_type,
unsigned int count)
{
dns_msgblock_t *block;
unsigned int length;
length = sizeof(dns_msgblock_t) + (sizeof_type * count);
block = isc_mem_get(mctx, length);
if (block == NULL)
return (NULL);
block->count = count;
block->remaining = count;
ISC_LINK_INIT(block, link);
return (block);
}
/*
* Return an element from the msgblock. If no more are available, return
* NULL.
*/
static inline void *
msgblock_internalget(dns_msgblock_t *block, unsigned int sizeof_type) {
void *ptr;
if (block == NULL || block->remaining == 0)
return (NULL);
block->remaining--;
ptr = (((unsigned char *)block)
+ sizeof(dns_msgblock_t)
+ (sizeof_type * block->remaining));
return (ptr);
}
static inline void
msgblock_reset(dns_msgblock_t *block) {
block->remaining = block->count;
}
/*
* Release memory associated with a message block.
*/
static inline void
msgblock_free(isc_mem_t *mctx, dns_msgblock_t *block, unsigned int sizeof_type)
{
unsigned int length;
length = sizeof(dns_msgblock_t) + (sizeof_type * block->count);
isc_mem_put(mctx, block, length);
}
/*
* Allocate a new dynamic buffer, and attach it to this message as the
* "current" buffer. (which is always the last on the list, for our
* uses)
*/
static inline isc_result_t
newbuffer(dns_message_t *msg, unsigned int size) {
isc_result_t result;
isc_buffer_t *dynbuf;
dynbuf = NULL;
result = isc_buffer_allocate(msg->mctx, &dynbuf, size);
if (result != ISC_R_SUCCESS)
return (ISC_R_NOMEMORY);
ISC_LIST_APPEND(msg->scratchpad, dynbuf, link);
return (ISC_R_SUCCESS);
}
static inline isc_buffer_t *
currentbuffer(dns_message_t *msg) {
isc_buffer_t *dynbuf;
dynbuf = ISC_LIST_TAIL(msg->scratchpad);
INSIST(dynbuf != NULL);
return (dynbuf);
}
static inline void
releaserdata(dns_message_t *msg, dns_rdata_t *rdata) {
ISC_LIST_PREPEND(msg->freerdata, rdata, link);
}
static inline dns_rdata_t *
newrdata(dns_message_t *msg) {
dns_msgblock_t *msgblock;
dns_rdata_t *rdata;
rdata = ISC_LIST_HEAD(msg->freerdata);
if (rdata != NULL) {
ISC_LIST_UNLINK(msg->freerdata, rdata, link);
return (rdata);
}
msgblock = ISC_LIST_TAIL(msg->rdatas);
rdata = msgblock_get(msgblock, dns_rdata_t);
if (rdata == NULL) {
msgblock = msgblock_allocate(msg->mctx, sizeof(dns_rdata_t),
RDATA_COUNT);
if (msgblock == NULL)
return (NULL);
ISC_LIST_APPEND(msg->rdatas, msgblock, link);
rdata = msgblock_get(msgblock, dns_rdata_t);
}
dns_rdata_init(rdata);
return (rdata);
}
static inline void
releaserdatalist(dns_message_t *msg, dns_rdatalist_t *rdatalist) {
ISC_LIST_PREPEND(msg->freerdatalist, rdatalist, link);
}
static inline dns_rdatalist_t *
newrdatalist(dns_message_t *msg) {
dns_msgblock_t *msgblock;
dns_rdatalist_t *rdatalist;
rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
if (rdatalist != NULL) {
ISC_LIST_UNLINK(msg->freerdatalist, rdatalist, link);
return (rdatalist);
}
msgblock = ISC_LIST_TAIL(msg->rdatalists);
rdatalist = msgblock_get(msgblock, dns_rdatalist_t);
if (rdatalist == NULL) {
msgblock = msgblock_allocate(msg->mctx,
sizeof(dns_rdatalist_t),
RDATALIST_COUNT);
if (msgblock == NULL)
return (NULL);
ISC_LIST_APPEND(msg->rdatalists, msgblock, link);
rdatalist = msgblock_get(msgblock, dns_rdatalist_t);
}
return (rdatalist);
}
static inline dns_offsets_t *
newoffsets(dns_message_t *msg) {
dns_msgblock_t *msgblock;
dns_offsets_t *offsets;
msgblock = ISC_LIST_TAIL(msg->offsets);
offsets = msgblock_get(msgblock, dns_offsets_t);
if (offsets == NULL) {
msgblock = msgblock_allocate(msg->mctx,
sizeof(dns_offsets_t),
OFFSET_COUNT);
if (msgblock == NULL)
return (NULL);
ISC_LIST_APPEND(msg->offsets, msgblock, link);
offsets = msgblock_get(msgblock, dns_offsets_t);
}
return (offsets);
}
static inline void
msginitheader(dns_message_t *m) {
m->id = 0;
m->flags = 0;
m->rcode = 0;
m->opcode = 0;
m->rdclass = 0;
}
static inline void
msginitprivate(dns_message_t *m) {
unsigned int i;
for (i = 0; i < DNS_SECTION_MAX; i++) {
m->cursors[i] = NULL;
m->counts[i] = 0;
}
m->opt = NULL;
m->sig0 = NULL;
m->sig0name = NULL;
m->tsig = NULL;
m->tsigname = NULL;
m->state = DNS_SECTION_ANY; /* indicate nothing parsed or rendered */
m->opt_reserved = 0;
m->sig_reserved = 0;
m->reserved = 0;
m->buffer = NULL;
}
static inline void
msginittsig(dns_message_t *m) {
m->tsigstatus = dns_rcode_noerror;
m->querytsigstatus = dns_rcode_noerror;
m->tsigkey = NULL;
m->tsigctx = NULL;
m->sigstart = -1;
m->sig0key = NULL;
m->sig0status = dns_rcode_noerror;
m->timeadjust = 0;
}
/*
* Init elements to default state. Used both when allocating a new element
* and when resetting one.
*/
static inline void
msginit(dns_message_t *m) {
msginitheader(m);
msginitprivate(m);
msginittsig(m);
m->header_ok = 0;
m->question_ok = 0;
m->tcp_continuation = 0;
m->verified_sig = 0;
m->verify_attempted = 0;
m->order = NULL;
m->order_arg = NULL;
m->query.base = NULL;
m->query.length = 0;
m->free_query = 0;
m->saved.base = NULL;
m->saved.length = 0;
m->free_saved = 0;
m->querytsig = NULL;
}
static inline void
msgresetnames(dns_message_t *msg, unsigned int first_section) {
unsigned int i;
dns_name_t *name, *next_name;
dns_rdataset_t *rds, *next_rds;
/*
* Clean up name lists by calling the rdataset disassociate function.
*/
for (i = first_section; i < DNS_SECTION_MAX; i++) {
name = ISC_LIST_HEAD(msg->sections[i]);
while (name != NULL) {
next_name = ISC_LIST_NEXT(name, link);
ISC_LIST_UNLINK(msg->sections[i], name, link);
rds = ISC_LIST_HEAD(name->list);
while (rds != NULL) {
next_rds = ISC_LIST_NEXT(rds, link);
ISC_LIST_UNLINK(name->list, rds, link);
INSIST(dns_rdataset_isassociated(rds));
dns_rdataset_disassociate(rds);
isc_mempool_put(msg->rdspool, rds);
rds = next_rds;
}
if (dns_name_dynamic(name))
dns_name_free(name, msg->mctx);
isc_mempool_put(msg->namepool, name);
name = next_name;
}
}
}
static void
msgresetopt(dns_message_t *msg)
{
if (msg->opt != NULL) {
if (msg->opt_reserved > 0) {
dns_message_renderrelease(msg, msg->opt_reserved);
msg->opt_reserved = 0;
}
INSIST(dns_rdataset_isassociated(msg->opt));
dns_rdataset_disassociate(msg->opt);
isc_mempool_put(msg->rdspool, msg->opt);
msg->opt = NULL;
}
}
static void
msgresetsigs(dns_message_t *msg, isc_boolean_t replying) {
if (msg->sig_reserved > 0) {
dns_message_renderrelease(msg, msg->sig_reserved);
msg->sig_reserved = 0;
}
if (msg->tsig != NULL) {
INSIST(dns_rdataset_isassociated(msg->tsig));
INSIST(msg->namepool != NULL);
if (replying) {
INSIST(msg->querytsig == NULL);
msg->querytsig = msg->tsig;
} else {
dns_rdataset_disassociate(msg->tsig);
isc_mempool_put(msg->rdspool, msg->tsig);
if (msg->querytsig != NULL) {
dns_rdataset_disassociate(msg->querytsig);
isc_mempool_put(msg->rdspool, msg->querytsig);
}
}
if (dns_name_dynamic(msg->tsigname))
dns_name_free(msg->tsigname, msg->mctx);
isc_mempool_put(msg->namepool, msg->tsigname);
msg->tsig = NULL;
msg->tsigname = NULL;
} else if (msg->querytsig != NULL && !replying) {
dns_rdataset_disassociate(msg->querytsig);
isc_mempool_put(msg->rdspool, msg->querytsig);
msg->querytsig = NULL;
}
if (msg->sig0 != NULL) {
INSIST(dns_rdataset_isassociated(msg->sig0));
dns_rdataset_disassociate(msg->sig0);
isc_mempool_put(msg->rdspool, msg->sig0);
if (msg->sig0name != NULL) {
if (dns_name_dynamic(msg->sig0name))
dns_name_free(msg->sig0name, msg->mctx);
isc_mempool_put(msg->namepool, msg->sig0name);
}
msg->sig0 = NULL;
msg->sig0name = NULL;
}
}
/*
* Free all but one (or everything) for this message. This is used by
* both dns_message_reset() and dns_message_destroy().
*/
static void
msgreset(dns_message_t *msg, isc_boolean_t everything) {
dns_msgblock_t *msgblock, *next_msgblock;
isc_buffer_t *dynbuf, *next_dynbuf;
dns_rdata_t *rdata;
dns_rdatalist_t *rdatalist;
msgresetnames(msg, 0);
msgresetopt(msg);
msgresetsigs(msg, ISC_FALSE);
/*
* Clean up linked lists.
*/
/*
* Run through the free lists, and just unlink anything found there.
* The memory isn't lost since these are part of message blocks we
* have allocated.
*/
rdata = ISC_LIST_HEAD(msg->freerdata);
while (rdata != NULL) {
ISC_LIST_UNLINK(msg->freerdata, rdata, link);
rdata = ISC_LIST_HEAD(msg->freerdata);
}
rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
while (rdatalist != NULL) {
ISC_LIST_UNLINK(msg->freerdatalist, rdatalist, link);
rdatalist = ISC_LIST_HEAD(msg->freerdatalist);
}
dynbuf = ISC_LIST_HEAD(msg->scratchpad);
INSIST(dynbuf != NULL);
if (!everything) {
isc_buffer_clear(dynbuf);
dynbuf = ISC_LIST_NEXT(dynbuf, link);
}
while (dynbuf != NULL) {
next_dynbuf = ISC_LIST_NEXT(dynbuf, link);
ISC_LIST_UNLINK(msg->scratchpad, dynbuf, link);
isc_buffer_free(&dynbuf);
dynbuf = next_dynbuf;
}
msgblock = ISC_LIST_HEAD(msg->rdatas);
if (!everything && msgblock != NULL) {
msgblock_reset(msgblock);
msgblock = ISC_LIST_NEXT(msgblock, link);
}
while (msgblock != NULL) {
next_msgblock = ISC_LIST_NEXT(msgblock, link);
ISC_LIST_UNLINK(msg->rdatas, msgblock, link);
msgblock_free(msg->mctx, msgblock, sizeof(dns_rdata_t));
msgblock = next_msgblock;
}
/*
* rdatalists could be empty.
*/
msgblock = ISC_LIST_HEAD(msg->rdatalists);
if (!everything && msgblock != NULL) {
msgblock_reset(msgblock);
msgblock = ISC_LIST_NEXT(msgblock, link);
}
while (msgblock != NULL) {
next_msgblock = ISC_LIST_NEXT(msgblock, link);
ISC_LIST_UNLINK(msg->rdatalists, msgblock, link);
msgblock_free(msg->mctx, msgblock, sizeof(dns_rdatalist_t));
msgblock = next_msgblock;
}
msgblock = ISC_LIST_HEAD(msg->offsets);
if (!everything && msgblock != NULL) {
msgblock_reset(msgblock);
msgblock = ISC_LIST_NEXT(msgblock, link);
}
while (msgblock != NULL) {
next_msgblock = ISC_LIST_NEXT(msgblock, link);
ISC_LIST_UNLINK(msg->offsets, msgblock, link);
msgblock_free(msg->mctx, msgblock, sizeof(dns_offsets_t));
msgblock = next_msgblock;
}
if (msg->tsigkey != NULL) {
dns_tsigkey_detach(&msg->tsigkey);
msg->tsigkey = NULL;
}
if (msg->tsigctx != NULL)
dst_context_destroy(&msg->tsigctx);
if (msg->query.base != NULL) {
if (msg->free_query != 0)
isc_mem_put(msg->mctx, msg->query.base,
msg->query.length);
msg->query.base = NULL;
msg->query.length = 0;
}
if (msg->saved.base != NULL) {
if (msg->free_saved != 0)
isc_mem_put(msg->mctx, msg->saved.base,
msg->saved.length);
msg->saved.base = NULL;
msg->saved.length = 0;
}
/*
* cleanup the buffer cleanup list
*/
dynbuf = ISC_LIST_HEAD(msg->cleanup);
while (dynbuf != NULL) {
next_dynbuf = ISC_LIST_NEXT(dynbuf, link);
ISC_LIST_UNLINK(msg->cleanup, dynbuf, link);
isc_buffer_free(&dynbuf);
dynbuf = next_dynbuf;
}
/*
* Set other bits to normal default values.
*/
if (!everything)
msginit(msg);
ENSURE(isc_mempool_getallocated(msg->namepool) == 0);
ENSURE(isc_mempool_getallocated(msg->rdspool) == 0);
}
static unsigned int
spacefortsig(dns_tsigkey_t *key, int otherlen) {
isc_region_t r1, r2;
unsigned int x;
isc_result_t result;
/*
* The space required for an TSIG record is:
*
* n1 bytes for the name
* 2 bytes for the type
* 2 bytes for the class
* 4 bytes for the ttl
* 2 bytes for the rdlength
* n2 bytes for the algorithm name
* 6 bytes for the time signed
* 2 bytes for the fudge
* 2 bytes for the MAC size
* x bytes for the MAC
* 2 bytes for the original id
* 2 bytes for the error
* 2 bytes for the other data length
* y bytes for the other data (at most)
* ---------------------------------
* 26 + n1 + n2 + x + y bytes
*/
dns_name_toregion(&key->name, &r1);
dns_name_toregion(key->algorithm, &r2);
if (key->key == NULL)
x = 0;
else {
result = dst_key_sigsize(key->key, &x);
if (result != ISC_R_SUCCESS)
x = 0;
}
return (26 + r1.length + r2.length + x + otherlen);
}
isc_result_t
dns_message_create(isc_mem_t *mctx, unsigned int intent, dns_message_t **msgp)
{
dns_message_t *m;
isc_result_t result;
isc_buffer_t *dynbuf;
unsigned int i;
REQUIRE(mctx != NULL);
REQUIRE(msgp != NULL);
REQUIRE(*msgp == NULL);
REQUIRE(intent == DNS_MESSAGE_INTENTPARSE
|| intent == DNS_MESSAGE_INTENTRENDER);
m = isc_mem_get(mctx, sizeof(dns_message_t));
if (m == NULL)
return (ISC_R_NOMEMORY);
/*
* No allocations until further notice. Just initialize all lists
* and other members that are freed in the cleanup phase here.
*/
m->magic = DNS_MESSAGE_MAGIC;
m->from_to_wire = intent;
msginit(m);
for (i = 0; i < DNS_SECTION_MAX; i++)
ISC_LIST_INIT(m->sections[i]);
m->mctx = mctx;
ISC_LIST_INIT(m->scratchpad);
ISC_LIST_INIT(m->cleanup);
m->namepool = NULL;
m->rdspool = NULL;
ISC_LIST_INIT(m->rdatas);
ISC_LIST_INIT(m->rdatalists);
ISC_LIST_INIT(m->offsets);
ISC_LIST_INIT(m->freerdata);
ISC_LIST_INIT(m->freerdatalist);
/*
* Ok, it is safe to allocate (and then "goto cleanup" if failure)
*/
result = isc_mempool_create(m->mctx, sizeof(dns_name_t), &m->namepool);
if (result != ISC_R_SUCCESS)
goto cleanup;
isc_mempool_setfreemax(m->namepool, NAME_COUNT);
isc_mempool_setname(m->namepool, "msg:names");
result = isc_mempool_create(m->mctx, sizeof(dns_rdataset_t),
&m->rdspool);
if (result != ISC_R_SUCCESS)
goto cleanup;
isc_mempool_setfreemax(m->rdspool, NAME_COUNT);
isc_mempool_setname(m->rdspool, "msg:rdataset");
dynbuf = NULL;
result = isc_buffer_allocate(mctx, &dynbuf, SCRATCHPAD_SIZE);
if (result != ISC_R_SUCCESS)
goto cleanup;
ISC_LIST_APPEND(m->scratchpad, dynbuf, link);
m->cctx = NULL;
*msgp = m;
return (ISC_R_SUCCESS);
/*
* Cleanup for error returns.
*/
cleanup:
dynbuf = ISC_LIST_HEAD(m->scratchpad);
if (dynbuf != NULL) {
ISC_LIST_UNLINK(m->scratchpad, dynbuf, link);
isc_buffer_free(&dynbuf);
}
if (m->namepool != NULL)
isc_mempool_destroy(&m->namepool);
if (m->rdspool != NULL)
isc_mempool_destroy(&m->rdspool);
m->magic = 0;
isc_mem_put(mctx, m, sizeof(dns_message_t));
return (ISC_R_NOMEMORY);
}
void
dns_message_reset(dns_message_t *msg, unsigned int intent) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(intent == DNS_MESSAGE_INTENTPARSE
|| intent == DNS_MESSAGE_INTENTRENDER);
msgreset(msg, ISC_FALSE);
msg->from_to_wire = intent;
}
void
dns_message_destroy(dns_message_t **msgp) {
dns_message_t *msg;
REQUIRE(msgp != NULL);
REQUIRE(DNS_MESSAGE_VALID(*msgp));
msg = *msgp;
*msgp = NULL;
msgreset(msg, ISC_TRUE);
isc_mempool_destroy(&msg->namepool);
isc_mempool_destroy(&msg->rdspool);
msg->magic = 0;
isc_mem_put(msg->mctx, msg, sizeof(dns_message_t));
}
static isc_result_t
findname(dns_name_t **foundname, dns_name_t *target,
dns_namelist_t *section)
{
dns_name_t *curr;
for (curr = ISC_LIST_TAIL(*section);
curr != NULL;
curr = ISC_LIST_PREV(curr, link)) {
if (dns_name_equal(curr, target)) {
if (foundname != NULL)
*foundname = curr;
return (ISC_R_SUCCESS);
}
}
return (ISC_R_NOTFOUND);
}
isc_result_t
dns_message_find(dns_name_t *name, dns_rdataclass_t rdclass,
dns_rdatatype_t type, dns_rdatatype_t covers,
dns_rdataset_t **rdataset)
{
dns_rdataset_t *curr;
if (rdataset != NULL) {
REQUIRE(*rdataset == NULL);
}
for (curr = ISC_LIST_TAIL(name->list);
curr != NULL;
curr = ISC_LIST_PREV(curr, link)) {
if (curr->rdclass == rdclass &&
curr->type == type && curr->covers == covers) {
if (rdataset != NULL)
*rdataset = curr;
return (ISC_R_SUCCESS);
}
}
return (ISC_R_NOTFOUND);
}
isc_result_t
dns_message_findtype(dns_name_t *name, dns_rdatatype_t type,
dns_rdatatype_t covers, dns_rdataset_t **rdataset)
{
dns_rdataset_t *curr;
REQUIRE(name != NULL);
if (rdataset != NULL) {
REQUIRE(*rdataset == NULL);
}
for (curr = ISC_LIST_TAIL(name->list);
curr != NULL;
curr = ISC_LIST_PREV(curr, link)) {
if (curr->type == type && curr->covers == covers) {
if (rdataset != NULL)
*rdataset = curr;
return (ISC_R_SUCCESS);
}
}
return (ISC_R_NOTFOUND);
}
/*
* Read a name from buffer "source".
*/
static isc_result_t
getname(dns_name_t *name, isc_buffer_t *source, dns_message_t *msg,
dns_decompress_t *dctx)
{
isc_buffer_t *scratch;
isc_result_t result;
unsigned int tries;
scratch = currentbuffer(msg);
/*
* First try: use current buffer.
* Second try: allocate a new buffer and use that.
*/
tries = 0;
while (tries < 2) {
result = dns_name_fromwire(name, source, dctx, ISC_FALSE,
scratch);
if (result == ISC_R_NOSPACE) {
tries++;
result = newbuffer(msg, SCRATCHPAD_SIZE);
if (result != ISC_R_SUCCESS)
return (result);
scratch = currentbuffer(msg);
dns_name_reset(name);
} else {
return (result);
}
}
INSIST(0); /* Cannot get here... */
return (ISC_R_UNEXPECTED);
}
static isc_result_t
getrdata(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
unsigned int rdatalen, dns_rdata_t *rdata)
{
isc_buffer_t *scratch;
isc_result_t result;
unsigned int tries;
unsigned int trysize;
scratch = currentbuffer(msg);
isc_buffer_setactive(source, rdatalen);
/*
* First try: use current buffer.
* Second try: allocate a new buffer of size
* max(SCRATCHPAD_SIZE, 2 * compressed_rdatalen)
* (the data will fit if it was not more than 50% compressed)
* Subsequent tries: double buffer size on each try.
*/
tries = 0;
trysize = 0;
/* XXX possibly change this to a while (tries < 2) loop */
for (;;) {
result = dns_rdata_fromwire(rdata, rdclass, rdtype,
source, dctx, 0,
scratch);
if (result == ISC_R_NOSPACE) {
if (tries == 0) {
trysize = 2 * rdatalen;
if (trysize < SCRATCHPAD_SIZE)
trysize = SCRATCHPAD_SIZE;
} else {
INSIST(trysize != 0);
if (trysize >= 65535)
return (ISC_R_NOSPACE);
/* XXX DNS_R_RRTOOLONG? */
trysize *= 2;
}
tries++;
result = newbuffer(msg, trysize);
if (result != ISC_R_SUCCESS)
return (result);
scratch = currentbuffer(msg);
} else {
return (result);
}
}
}
#define DO_FORMERR \
do { \
if (best_effort) \
seen_problem = ISC_TRUE; \
else { \
result = DNS_R_FORMERR; \
goto cleanup; \
} \
} while (0)
static isc_result_t
getquestions(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
unsigned int options)
{
isc_region_t r;
unsigned int count;
dns_name_t *name;
dns_name_t *name2;
dns_offsets_t *offsets;
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
isc_result_t result;
dns_rdatatype_t rdtype;
dns_rdataclass_t rdclass;
dns_namelist_t *section;
isc_boolean_t free_name;
isc_boolean_t best_effort;
isc_boolean_t seen_problem;
section = &msg->sections[DNS_SECTION_QUESTION];
best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT);
seen_problem = ISC_FALSE;
name = NULL;
rdataset = NULL;
rdatalist = NULL;
for (count = 0; count < msg->counts[DNS_SECTION_QUESTION]; count++) {
name = isc_mempool_get(msg->namepool);
if (name == NULL)
return (ISC_R_NOMEMORY);
free_name = ISC_TRUE;
offsets = newoffsets(msg);
if (offsets == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_init(name, *offsets);
/*
* Parse the name out of this packet.
*/
isc_buffer_remainingregion(source, &r);
isc_buffer_setactive(source, r.length);
result = getname(name, source, msg, dctx);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Run through the section, looking to see if this name
* is already there. If it is found, put back the allocated
* name since we no longer need it, and set our name pointer
* to point to the name we found.
*/
result = findname(&name2, name, section);
/*
* If it is the first name in the section, accept it.
*
* If it is not, but is not the same as the name already
* in the question section, append to the section. Note that
* here in the question section this is illegal, so return
* FORMERR. In the future, check the opcode to see if
* this should be legal or not. In either case we no longer
* need this name pointer.
*/
if (result != ISC_R_SUCCESS) {
if (!ISC_LIST_EMPTY(*section))
DO_FORMERR;
ISC_LIST_APPEND(*section, name, link);
free_name = ISC_FALSE;
} else {
isc_mempool_put(msg->namepool, name);
name = name2;
name2 = NULL;
free_name = ISC_FALSE;
}
/*
* Get type and class.
*/
isc_buffer_remainingregion(source, &r);
if (r.length < 4) {
result = ISC_R_UNEXPECTEDEND;
goto cleanup;
}
rdtype = isc_buffer_getuint16(source);
rdclass = isc_buffer_getuint16(source);
/*
* If this class is different than the one we already read,
* this is an error.
*/
if (msg->state == DNS_SECTION_ANY) {
msg->state = DNS_SECTION_QUESTION;
msg->rdclass = rdclass;
} else if (msg->rdclass != rdclass)
DO_FORMERR;
/*
* Can't ask the same question twice.
*/
result = dns_message_find(name, rdclass, rdtype, 0, NULL);
if (result == ISC_R_SUCCESS)
DO_FORMERR;
/*
* Allocate a new rdatalist.
*/
rdatalist = newrdatalist(msg);
if (rdatalist == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
rdataset = isc_mempool_get(msg->rdspool);
if (rdataset == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
/*
* Convert rdatalist to rdataset, and attach the latter to
* the name.
*/
rdatalist->type = rdtype;
rdatalist->covers = 0;
rdatalist->rdclass = rdclass;
rdatalist->ttl = 0;
ISC_LIST_INIT(rdatalist->rdata);
dns_rdataset_init(rdataset);
result = dns_rdatalist_tordataset(rdatalist, rdataset);
if (result != ISC_R_SUCCESS)
goto cleanup;
rdataset->attributes |= DNS_RDATASETATTR_QUESTION;
ISC_LIST_APPEND(name->list, rdataset, link);
rdataset = NULL;
}
if (seen_problem)
return (DNS_R_RECOVERABLE);
return (ISC_R_SUCCESS);
cleanup:
if (rdataset != NULL) {
INSIST(!dns_rdataset_isassociated(rdataset));
isc_mempool_put(msg->rdspool, rdataset);
}
#if 0
if (rdatalist != NULL)
isc_mempool_put(msg->rdlpool, rdatalist);
#endif
if (free_name)
isc_mempool_put(msg->namepool, name);
return (result);
}
static isc_boolean_t
update(dns_section_t section, dns_rdataclass_t rdclass) {
if (section == DNS_SECTION_PREREQUISITE)
return (ISC_TF(rdclass == dns_rdataclass_any ||
rdclass == dns_rdataclass_none));
if (section == DNS_SECTION_UPDATE)
return (ISC_TF(rdclass == dns_rdataclass_any));
return (ISC_FALSE);
}
static isc_result_t
getsection(isc_buffer_t *source, dns_message_t *msg, dns_decompress_t *dctx,
dns_section_t sectionid, unsigned int options)
{
isc_region_t r;
unsigned int count, rdatalen;
dns_name_t *name;
dns_name_t *name2;
dns_offsets_t *offsets;
dns_rdataset_t *rdataset;
dns_rdatalist_t *rdatalist;
isc_result_t result;
dns_rdatatype_t rdtype, covers;
dns_rdataclass_t rdclass;
dns_rdata_t *rdata;
dns_ttl_t ttl;
dns_namelist_t *section;
isc_boolean_t free_name, free_rdataset;
isc_boolean_t preserve_order, best_effort, seen_problem;
isc_boolean_t issigzero;
preserve_order = ISC_TF(options & DNS_MESSAGEPARSE_PRESERVEORDER);
best_effort = ISC_TF(options & DNS_MESSAGEPARSE_BESTEFFORT);
seen_problem = ISC_FALSE;
for (count = 0; count < msg->counts[sectionid]; count++) {
int recstart = source->current;
isc_boolean_t skip_name_search, skip_type_search;
section = &msg->sections[sectionid];
skip_name_search = ISC_FALSE;
skip_type_search = ISC_FALSE;
free_name = ISC_FALSE;
free_rdataset = ISC_FALSE;
name = isc_mempool_get(msg->namepool);
if (name == NULL)
return (ISC_R_NOMEMORY);
free_name = ISC_TRUE;
offsets = newoffsets(msg);
if (offsets == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
dns_name_init(name, *offsets);
/*
* Parse the name out of this packet.
*/
isc_buffer_remainingregion(source, &r);
isc_buffer_setactive(source, r.length);
result = getname(name, source, msg, dctx);
if (result != ISC_R_SUCCESS)
goto cleanup;
/*
* Get type, class, ttl, and rdatalen. Verify that at least
* rdatalen bytes remain. (Some of this is deferred to
* later.)
*/
isc_buffer_remainingregion(source, &r);
if (r.length < 2 + 2 + 4 + 2) {
result = ISC_R_UNEXPECTEDEND;
goto cleanup;
}
rdtype = isc_buffer_getuint16(source);
rdclass = isc_buffer_getuint16(source);
/*
* If there was no question section, we may not yet have
* established a class. Do so now.
*/
if (msg->state == DNS_SECTION_ANY &&
rdtype != dns_rdatatype_opt && /* class is UDP SIZE */
rdtype != dns_rdatatype_tsig && /* class is ANY */
rdtype != dns_rdatatype_tkey) { /* class is undefined */
msg->rdclass = rdclass;
msg->state = DNS_SECTION_QUESTION;
}
/*
* If this class is different than the one in the question
* section, bail.
*/
if (msg->opcode != dns_opcode_update
&& rdtype != dns_rdatatype_tsig
&& rdtype != dns_rdatatype_opt
&& rdtype != dns_rdatatype_dnskey /* in a TKEY query */
&& rdtype != dns_rdatatype_sig /* SIG(0) */
&& rdtype != dns_rdatatype_tkey /* Win2000 TKEY */
&& msg->rdclass != dns_rdataclass_any
&& msg->rdclass != rdclass)
DO_FORMERR;
/*
* Special type handling for TSIG, OPT, and TKEY.
*/
if (rdtype == dns_rdatatype_tsig) {
/*
* If it is a tsig, verify that it is in the
* additional data section.
*/
if (sectionid != DNS_SECTION_ADDITIONAL ||
rdclass != dns_rdataclass_any ||
count != msg->counts[sectionid] - 1)
DO_FORMERR;
msg->sigstart = recstart;
skip_name_search = ISC_TRUE;
skip_type_search = ISC_TRUE;
} else if (rdtype == dns_rdatatype_opt) {
/*
* The name of an OPT record must be ".", it
* must be in the additional data section, and
* it must be the first OPT we've seen.
*/
if (!dns_name_equal(dns_rootname, name) ||
msg->opt != NULL)
DO_FORMERR;
skip_name_search = ISC_TRUE;
skip_type_search = ISC_TRUE;
} else if (rdtype == dns_rdatatype_tkey) {
/*
* A TKEY must be in the additional section if this
* is a query, and the answer section if this is a
* response. Unless it's a Win2000 client.
*
* Its class is ignored.
*/
dns_section_t tkeysection;
if ((msg->flags & DNS_MESSAGEFLAG_QR) == 0)
tkeysection = DNS_SECTION_ADDITIONAL;
else
tkeysection = DNS_SECTION_ANSWER;
if (sectionid != tkeysection &&
sectionid != DNS_SECTION_ANSWER)
DO_FORMERR;
}
/*
* ... now get ttl and rdatalen, and check buffer.
*/
ttl = isc_buffer_getuint32(source);
rdatalen = isc_buffer_getuint16(source);
r.length -= (2 + 2 + 4 + 2);
if (r.length < rdatalen) {
result = ISC_R_UNEXPECTEDEND;
goto cleanup;
}
/*
* Read the rdata from the wire format. Interpret the
* rdata according to its actual class, even if it had a
* DynDNS meta-class in the packet (unless this is a TSIG).
* Then put the meta-class back into the finished rdata.
*/
rdata = newrdata(msg);
if (rdata == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
if (msg->opcode == dns_opcode_update &&
update(sectionid, rdclass)) {
if (rdatalen != 0) {
result = DNS_R_FORMERR;
goto cleanup;
}
/*
* When the rdata is empty, the data pointer is
* never dereferenced, but it must still be non-NULL.
* Casting 1 rather than "" avoids warnings about
* discarding the const attribute of a string,
* for compilers that would warn about such things.
*/
rdata->data = (unsigned char *)1;
rdata->length = 0;
rdata->rdclass = rdclass;
rdata->type = rdtype;
rdata->flags = DNS_RDATA_UPDATE;
result = ISC_R_SUCCESS;
} else if (rdclass == dns_rdataclass_none &&
msg->opcode == dns_opcode_update &&
sectionid == DNS_SECTION_UPDATE) {
result = getrdata(source, msg, dctx, msg->rdclass,
rdtype, rdatalen, rdata);
} else
result = getrdata(source, msg, dctx, rdclass,
rdtype, rdatalen, rdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
rdata->rdclass = rdclass;
issigzero = ISC_FALSE;
if (rdtype == dns_rdatatype_rrsig &&
rdata->flags == 0) {
covers = dns_rdata_covers(rdata);
if (covers == 0)
DO_FORMERR;
} else if (rdtype == dns_rdatatype_sig /* SIG(0) */ &&
rdata->flags == 0) {
covers = dns_rdata_covers(rdata);
if (covers == 0) {
if (sectionid != DNS_SECTION_ADDITIONAL ||
count != msg->counts[sectionid] - 1)
DO_FORMERR;
msg->sigstart = recstart;
skip_name_search = ISC_TRUE;
skip_type_search = ISC_TRUE;
issigzero = ISC_TRUE;
}
} else
covers = 0;
/*
* If we are doing a dynamic update or this is a meta-type,
* don't bother searching for a name, just append this one
* to the end of the message.
*/
if (preserve_order || msg->opcode == dns_opcode_update ||
skip_name_search) {
if (rdtype != dns_rdatatype_opt &&
rdtype != dns_rdatatype_tsig &&
!issigzero)
{
ISC_LIST_APPEND(*section, name, link);
free_name = ISC_FALSE;
}
} else {
/*
* Run through the section, looking to see if this name
* is already there. If it is found, put back the
* allocated name since we no longer need it, and set
* our name pointer to point to the name we found.
*/
result = findname(&name2, name, section);
/*
* If it is a new name, append to the section.
*/
if (result == ISC_R_SUCCESS) {
isc_mempool_put(msg->namepool, name);
name = name2;
} else {
ISC_LIST_APPEND(*section, name, link);
}
free_name = ISC_FALSE;
}
/*
* Search name for the particular type and class.
* Skip this stage if in update mode or this is a meta-type.
*/
if (preserve_order || msg->opcode == dns_opcode_update ||
skip_type_search)
result = ISC_R_NOTFOUND;
else {
/*
* If this is a type that can only occur in
* the question section, fail.
*/
if (dns_rdatatype_questiononly(rdtype))
DO_FORMERR;
rdataset = NULL;
result = dns_message_find(name, rdclass, rdtype,
covers, &rdataset);
}
/*
* If we found an rdataset that matches, we need to
* append this rdata to that set. If we did not, we need
* to create a new rdatalist, store the important bits there,
* convert it to an rdataset, and link the latter to the name.
* Yuck. When appending, make certain that the type isn't
* a singleton type, such as SOA or CNAME.
*
* Note that this check will be bypassed when preserving order,
* the opcode is an update, or the type search is skipped.
*/
if (result == ISC_R_SUCCESS) {
if (dns_rdatatype_issingleton(rdtype))
DO_FORMERR;
}
if (result == ISC_R_NOTFOUND) {
rdataset = isc_mempool_get(msg->rdspool);
if (rdataset == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
free_rdataset = ISC_TRUE;
rdatalist = newrdatalist(msg);
if (rdatalist == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
rdatalist->type = rdtype;
rdatalist->covers = covers;
rdatalist->rdclass = rdclass;
rdatalist->ttl = ttl;
ISC_LIST_INIT(rdatalist->rdata);
dns_rdataset_init(rdataset);
RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist,
rdataset)
== ISC_R_SUCCESS);
if (rdtype != dns_rdatatype_opt &&
rdtype != dns_rdatatype_tsig &&
!issigzero)
{
ISC_LIST_APPEND(name->list, rdataset, link);
free_rdataset = ISC_FALSE;
}
}
/*
* Minimize TTLs.
*
* Section 5.2 of RFC2181 says we should drop
* nonauthoritative rrsets where the TTLs differ, but we
* currently treat them the as if they were authoritative and
* minimize them.
*/
if (ttl != rdataset->ttl) {
rdataset->attributes |= DNS_RDATASETATTR_TTLADJUSTED;
if (ttl < rdataset->ttl)
rdataset->ttl = ttl;
}
/* Append this rdata to the rdataset. */
dns_rdatalist_fromrdataset(rdataset, &rdatalist);
ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
/*
* If this is an OPT record, remember it. Also, set
* the extended rcode. Note that msg->opt will only be set
* if best-effort parsing is enabled.
*/
if (rdtype == dns_rdatatype_opt && msg->opt == NULL) {
dns_rcode_t ercode;
msg->opt = rdataset;
rdataset = NULL;
free_rdataset = ISC_FALSE;
ercode = (dns_rcode_t)
((msg->opt->ttl & DNS_MESSAGE_EDNSRCODE_MASK)
>> 20);
msg->rcode |= ercode;
isc_mempool_put(msg->namepool, name);
free_name = ISC_FALSE;
}
/*
* If this is an SIG(0) or TSIG record, remember it. Note
* that msg->sig0 or msg->tsig will only be set if best-effort
* parsing is enabled.
*/
if (issigzero && msg->sig0 == NULL) {
msg->sig0 = rdataset;
msg->sig0name = name;
rdataset = NULL;
free_rdataset = ISC_FALSE;
free_name = ISC_FALSE;
} else if (rdtype == dns_rdatatype_tsig && msg->tsig == NULL) {
msg->tsig = rdataset;
msg->tsigname = name;
/* Windows doesn't like TSIG names to be compressed. */
msg->tsigname->attributes |= DNS_NAMEATTR_NOCOMPRESS;
rdataset = NULL;
free_rdataset = ISC_FALSE;
free_name = ISC_FALSE;
}
if (seen_problem) {
if (free_name)
isc_mempool_put(msg->namepool, name);
if (free_rdataset)
isc_mempool_put(msg->rdspool, rdataset);
free_name = free_rdataset = ISC_FALSE;
}
INSIST(free_name == ISC_FALSE);
INSIST(free_rdataset == ISC_FALSE);
}
if (seen_problem)
return (DNS_R_RECOVERABLE);
return (ISC_R_SUCCESS);
cleanup:
if (free_name)
isc_mempool_put(msg->namepool, name);
if (free_rdataset)
isc_mempool_put(msg->rdspool, rdataset);
return (result);
}
isc_result_t
dns_message_parse(dns_message_t *msg, isc_buffer_t *source,
unsigned int options)
{
isc_region_t r;
dns_decompress_t dctx;
isc_result_t ret;
isc_uint16_t tmpflags;
isc_buffer_t origsource;
isc_boolean_t seen_problem;
isc_boolean_t ignore_tc;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(source != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE);
seen_problem = ISC_FALSE;
ignore_tc = ISC_TF(options & DNS_MESSAGEPARSE_IGNORETRUNCATION);
origsource = *source;
msg->header_ok = 0;
msg->question_ok = 0;
isc_buffer_remainingregion(source, &r);
if (r.length < DNS_MESSAGE_HEADERLEN)
return (ISC_R_UNEXPECTEDEND);
msg->id = isc_buffer_getuint16(source);
tmpflags = isc_buffer_getuint16(source);
msg->opcode = ((tmpflags & DNS_MESSAGE_OPCODE_MASK)
>> DNS_MESSAGE_OPCODE_SHIFT);
msg->rcode = (dns_rcode_t)(tmpflags & DNS_MESSAGE_RCODE_MASK);
msg->flags = (tmpflags & DNS_MESSAGE_FLAG_MASK);
msg->counts[DNS_SECTION_QUESTION] = isc_buffer_getuint16(source);
msg->counts[DNS_SECTION_ANSWER] = isc_buffer_getuint16(source);
msg->counts[DNS_SECTION_AUTHORITY] = isc_buffer_getuint16(source);
msg->counts[DNS_SECTION_ADDITIONAL] = isc_buffer_getuint16(source);
msg->header_ok = 1;
/*
* -1 means no EDNS.
*/
dns_decompress_init(&dctx, -1, DNS_DECOMPRESS_ANY);
dns_decompress_setmethods(&dctx, DNS_COMPRESS_GLOBAL14);
ret = getquestions(source, msg, &dctx, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS;
}
if (ret != ISC_R_SUCCESS)
return (ret);
msg->question_ok = 1;
ret = getsection(source, msg, &dctx, DNS_SECTION_ANSWER, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS;
}
if (ret != ISC_R_SUCCESS)
return (ret);
ret = getsection(source, msg, &dctx, DNS_SECTION_AUTHORITY, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS;
}
if (ret != ISC_R_SUCCESS)
return (ret);
ret = getsection(source, msg, &dctx, DNS_SECTION_ADDITIONAL, options);
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
goto truncated;
if (ret == DNS_R_RECOVERABLE) {
seen_problem = ISC_TRUE;
ret = ISC_R_SUCCESS;
}
if (ret != ISC_R_SUCCESS)
return (ret);
isc_buffer_remainingregion(source, &r);
if (r.length != 0) {
isc_log_write(dns_lctx, ISC_LOGCATEGORY_GENERAL,
DNS_LOGMODULE_MESSAGE, ISC_LOG_DEBUG(3),
"message has %u byte(s) of trailing garbage",
r.length);
}
truncated:
if ((options & DNS_MESSAGEPARSE_CLONEBUFFER) == 0)
isc_buffer_usedregion(&origsource, &msg->saved);
else {
msg->saved.length = isc_buffer_usedlength(&origsource);
msg->saved.base = isc_mem_get(msg->mctx, msg->saved.length);
if (msg->saved.base == NULL)
return (ISC_R_NOMEMORY);
memcpy(msg->saved.base, isc_buffer_base(&origsource),
msg->saved.length);
msg->free_saved = 1;
}
if (ret == ISC_R_UNEXPECTEDEND && ignore_tc)
return (DNS_R_RECOVERABLE);
if (seen_problem == ISC_TRUE)
return (DNS_R_RECOVERABLE);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_renderbegin(dns_message_t *msg, dns_compress_t *cctx,
isc_buffer_t *buffer)
{
isc_region_t r;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(buffer != NULL);
REQUIRE(msg->buffer == NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
msg->cctx = cctx;
/*
* Erase the contents of this buffer.
*/
isc_buffer_clear(buffer);
/*
* Make certain there is enough for at least the header in this
* buffer.
*/
isc_buffer_availableregion(buffer, &r);
if (r.length < DNS_MESSAGE_HEADERLEN)
return (ISC_R_NOSPACE);
if (r.length < msg->reserved)
return (ISC_R_NOSPACE);
/*
* Reserve enough space for the header in this buffer.
*/
isc_buffer_add(buffer, DNS_MESSAGE_HEADERLEN);
msg->buffer = buffer;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_renderchangebuffer(dns_message_t *msg, isc_buffer_t *buffer) {
isc_region_t r, rn;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(buffer != NULL);
REQUIRE(msg->buffer != NULL);
/*
* Ensure that the new buffer is empty, and has enough space to
* hold the current contents.
*/
isc_buffer_clear(buffer);
isc_buffer_availableregion(buffer, &rn);
isc_buffer_usedregion(msg->buffer, &r);
REQUIRE(rn.length > r.length);
/*
* Copy the contents from the old to the new buffer.
*/
isc_buffer_add(buffer, r.length);
memcpy(rn.base, r.base, r.length);
msg->buffer = buffer;
return (ISC_R_SUCCESS);
}
void
dns_message_renderrelease(dns_message_t *msg, unsigned int space) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(space <= msg->reserved);
msg->reserved -= space;
}
isc_result_t
dns_message_renderreserve(dns_message_t *msg, unsigned int space) {
isc_region_t r;
REQUIRE(DNS_MESSAGE_VALID(msg));
if (msg->buffer != NULL) {
isc_buffer_availableregion(msg->buffer, &r);
if (r.length < (space + msg->reserved))
return (ISC_R_NOSPACE);
}
msg->reserved += space;
return (ISC_R_SUCCESS);
}
static inline isc_boolean_t
wrong_priority(dns_rdataset_t *rds, int pass, dns_rdatatype_t preferred_glue) {
int pass_needed;
/*
* If we are not rendering class IN, this ordering is bogus.
*/
if (rds->rdclass != dns_rdataclass_in)
return (ISC_FALSE);
switch (rds->type) {
case dns_rdatatype_a:
case dns_rdatatype_aaaa:
if (preferred_glue == rds->type)
pass_needed = 4;
else
pass_needed = 3;
break;
case dns_rdatatype_rrsig:
case dns_rdatatype_dnskey:
pass_needed = 2;
break;
default:
pass_needed = 1;
}
if (pass_needed >= pass)
return (ISC_FALSE);
return (ISC_TRUE);
}
isc_result_t
dns_message_rendersection(dns_message_t *msg, dns_section_t sectionid,
unsigned int options)
{
dns_namelist_t *section;
dns_name_t *name, *next_name;
dns_rdataset_t *rdataset, *next_rdataset;
unsigned int count, total;
isc_result_t result;
isc_buffer_t st; /* for rollbacks */
int pass;
isc_boolean_t partial = ISC_FALSE;
unsigned int rd_options;
dns_rdatatype_t preferred_glue = 0;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->buffer != NULL);
REQUIRE(VALID_NAMED_SECTION(sectionid));
section = &msg->sections[sectionid];
if ((sectionid == DNS_SECTION_ADDITIONAL)
&& (options & DNS_MESSAGERENDER_ORDERED) == 0) {
if ((options & DNS_MESSAGERENDER_PREFER_A) != 0) {
preferred_glue = dns_rdatatype_a;
pass = 4;
} else if ((options & DNS_MESSAGERENDER_PREFER_AAAA) != 0) {
preferred_glue = dns_rdatatype_aaaa;
pass = 4;
} else
pass = 3;
} else
pass = 1;
if ((options & DNS_MESSAGERENDER_OMITDNSSEC) == 0)
rd_options = 0;
else
rd_options = DNS_RDATASETTOWIRE_OMITDNSSEC;
/*
* Shrink the space in the buffer by the reserved amount.
*/
msg->buffer->length -= msg->reserved;
total = 0;
if (msg->reserved == 0 && (options & DNS_MESSAGERENDER_PARTIAL) != 0)
partial = ISC_TRUE;
/*
* Render required glue first. Set TC if it won't fit.
*/
name = ISC_LIST_HEAD(*section);
if (name != NULL) {
rdataset = ISC_LIST_HEAD(name->list);
if (rdataset != NULL &&
(rdataset->attributes & DNS_RDATASETATTR_REQUIREDGLUE) != 0 &&
(rdataset->attributes & DNS_RDATASETATTR_RENDERED) == 0) {
const void *order_arg = msg->order_arg;
st = *(msg->buffer);
count = 0;
if (partial)
result = dns_rdataset_towirepartial(rdataset,
name,
msg->cctx,
msg->buffer,
msg->order,
order_arg,
rd_options,
&count,
NULL);
else
result = dns_rdataset_towiresorted(rdataset,
name,
msg->cctx,
msg->buffer,
msg->order,
order_arg,
rd_options,
&count);
total += count;
if (partial && result == ISC_R_NOSPACE) {
msg->flags |= DNS_MESSAGEFLAG_TC;
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (result);
}
if (result == ISC_R_NOSPACE)
msg->flags |= DNS_MESSAGEFLAG_TC;
if (result != ISC_R_SUCCESS) {
INSIST(st.used < 65536);
dns_compress_rollback(msg->cctx,
(isc_uint16_t)st.used);
*(msg->buffer) = st; /* rollback */
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (result);
}
rdataset->attributes |= DNS_RDATASETATTR_RENDERED;
}
}
do {
name = ISC_LIST_HEAD(*section);
if (name == NULL) {
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (ISC_R_SUCCESS);
}
while (name != NULL) {
next_name = ISC_LIST_NEXT(name, link);
rdataset = ISC_LIST_HEAD(name->list);
while (rdataset != NULL) {
next_rdataset = ISC_LIST_NEXT(rdataset, link);
if ((rdataset->attributes &
DNS_RDATASETATTR_RENDERED) != 0)
goto next;
if (((options & DNS_MESSAGERENDER_ORDERED)
== 0)
&& (sectionid == DNS_SECTION_ADDITIONAL)
&& wrong_priority(rdataset, pass,
preferred_glue))
goto next;
st = *(msg->buffer);
count = 0;
if (partial)
result = dns_rdataset_towirepartial(
rdataset,
name,
msg->cctx,
msg->buffer,
msg->order,
msg->order_arg,
rd_options,
&count,
NULL);
else
result = dns_rdataset_towiresorted(
rdataset,
name,
msg->cctx,
msg->buffer,
msg->order,
msg->order_arg,
rd_options,
&count);
total += count;
/*
* If out of space, record stats on what we
* rendered so far, and return that status.
*
* XXXMLG Need to change this when
* dns_rdataset_towire() can render partial
* sets starting at some arbitrary point in the
* set. This will include setting a bit in the
* rdataset to indicate that a partial
* rendering was done, and some state saved
* somewhere (probably in the message struct)
* to indicate where to continue from.
*/
if (partial && result == ISC_R_NOSPACE) {
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (result);
}
if (result != ISC_R_SUCCESS) {
INSIST(st.used < 65536);
dns_compress_rollback(msg->cctx,
(isc_uint16_t)st.used);
*(msg->buffer) = st; /* rollback */
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (result);
}
/*
* If we have rendered non-validated data,
* ensure that the AD bit is not set.
*/
if (rdataset->trust != dns_trust_secure &&
(sectionid == DNS_SECTION_ANSWER ||
sectionid == DNS_SECTION_AUTHORITY))
msg->flags &= ~DNS_MESSAGEFLAG_AD;
if (OPTOUT(rdataset))
msg->flags &= ~DNS_MESSAGEFLAG_AD;
rdataset->attributes |=
DNS_RDATASETATTR_RENDERED;
next:
rdataset = next_rdataset;
}
name = next_name;
}
} while (--pass != 0);
msg->buffer->length += msg->reserved;
msg->counts[sectionid] += total;
return (ISC_R_SUCCESS);
}
void
dns_message_renderheader(dns_message_t *msg, isc_buffer_t *target) {
isc_uint16_t tmp;
isc_region_t r;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(target != NULL);
isc_buffer_availableregion(target, &r);
REQUIRE(r.length >= DNS_MESSAGE_HEADERLEN);
isc_buffer_putuint16(target, msg->id);
tmp = ((msg->opcode << DNS_MESSAGE_OPCODE_SHIFT)
& DNS_MESSAGE_OPCODE_MASK);
tmp |= (msg->rcode & DNS_MESSAGE_RCODE_MASK);
tmp |= (msg->flags & DNS_MESSAGE_FLAG_MASK);
INSIST(msg->counts[DNS_SECTION_QUESTION] < 65536 &&
msg->counts[DNS_SECTION_ANSWER] < 65536 &&
msg->counts[DNS_SECTION_AUTHORITY] < 65536 &&
msg->counts[DNS_SECTION_ADDITIONAL] < 65536);
isc_buffer_putuint16(target, tmp);
isc_buffer_putuint16(target,
(isc_uint16_t)msg->counts[DNS_SECTION_QUESTION]);
isc_buffer_putuint16(target,
(isc_uint16_t)msg->counts[DNS_SECTION_ANSWER]);
isc_buffer_putuint16(target,
(isc_uint16_t)msg->counts[DNS_SECTION_AUTHORITY]);
isc_buffer_putuint16(target,
(isc_uint16_t)msg->counts[DNS_SECTION_ADDITIONAL]);
}
isc_result_t
dns_message_renderend(dns_message_t *msg) {
isc_buffer_t tmpbuf;
isc_region_t r;
int result;
unsigned int count;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->buffer != NULL);
if ((msg->rcode & ~DNS_MESSAGE_RCODE_MASK) != 0 && msg->opt == NULL) {
/*
* We have an extended rcode but are not using EDNS.
*/
return (DNS_R_FORMERR);
}
/*
* If we've got an OPT record, render it.
*/
if (msg->opt != NULL) {
dns_message_renderrelease(msg, msg->opt_reserved);
msg->opt_reserved = 0;
/*
* Set the extended rcode.
*/
msg->opt->ttl &= ~DNS_MESSAGE_EDNSRCODE_MASK;
msg->opt->ttl |= ((msg->rcode << 20) &
DNS_MESSAGE_EDNSRCODE_MASK);
/*
* Render.
*/
count = 0;
result = dns_rdataset_towire(msg->opt, dns_rootname,
msg->cctx, msg->buffer, 0,
&count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);
}
/*
* If we're adding a TSIG or SIG(0) to a truncated message,
* clear all rdatasets from the message except for the question
* before adding the TSIG or SIG(0). If the question doesn't fit,
* don't include it.
*/
if ((msg->tsigkey != NULL || msg->sig0key != NULL) &&
(msg->flags & DNS_MESSAGEFLAG_TC) != 0)
{
isc_buffer_t *buf;
msgresetnames(msg, DNS_SECTION_ANSWER);
buf = msg->buffer;
dns_message_renderreset(msg);
msg->buffer = buf;
isc_buffer_clear(msg->buffer);
isc_buffer_add(msg->buffer, DNS_MESSAGE_HEADERLEN);
dns_compress_rollback(msg->cctx, 0);
result = dns_message_rendersection(msg, DNS_SECTION_QUESTION,
0);
if (result != ISC_R_SUCCESS && result != ISC_R_NOSPACE)
return (result);
}
/*
* If we're adding a TSIG record, generate and render it.
*/
if (msg->tsigkey != NULL) {
dns_message_renderrelease(msg, msg->sig_reserved);
msg->sig_reserved = 0;
result = dns_tsig_sign(msg);
if (result != ISC_R_SUCCESS)
return (result);
count = 0;
result = dns_rdataset_towire(msg->tsig, msg->tsigname,
msg->cctx, msg->buffer, 0,
&count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);
}
/*
* If we're adding a SIG(0) record, generate and render it.
*/
if (msg->sig0key != NULL) {
dns_message_renderrelease(msg, msg->sig_reserved);
msg->sig_reserved = 0;
result = dns_dnssec_signmessage(msg, msg->sig0key);
if (result != ISC_R_SUCCESS)
return (result);
count = 0;
/*
* Note: dns_rootname is used here, not msg->sig0name, since
* the owner name of a SIG(0) is irrelevant, and will not
* be set in a message being rendered.
*/
result = dns_rdataset_towire(msg->sig0, dns_rootname,
msg->cctx, msg->buffer, 0,
&count);
msg->counts[DNS_SECTION_ADDITIONAL] += count;
if (result != ISC_R_SUCCESS)
return (result);
}
isc_buffer_usedregion(msg->buffer, &r);
isc_buffer_init(&tmpbuf, r.base, r.length);
dns_message_renderheader(msg, &tmpbuf);
msg->buffer = NULL; /* forget about this buffer only on success XXX */
return (ISC_R_SUCCESS);
}
void
dns_message_renderreset(dns_message_t *msg) {
unsigned int i;
dns_name_t *name;
dns_rdataset_t *rds;
/*
* Reset the message so that it may be rendered again.
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
msg->buffer = NULL;
for (i = 0; i < DNS_SECTION_MAX; i++) {
msg->cursors[i] = NULL;
msg->counts[i] = 0;
for (name = ISC_LIST_HEAD(msg->sections[i]);
name != NULL;
name = ISC_LIST_NEXT(name, link)) {
for (rds = ISC_LIST_HEAD(name->list);
rds != NULL;
rds = ISC_LIST_NEXT(rds, link)) {
rds->attributes &= ~DNS_RDATASETATTR_RENDERED;
}
}
}
if (msg->tsigname != NULL)
dns_message_puttempname(msg, &msg->tsigname);
if (msg->tsig != NULL) {
dns_rdataset_disassociate(msg->tsig);
dns_message_puttemprdataset(msg, &msg->tsig);
}
if (msg->sig0 != NULL) {
dns_rdataset_disassociate(msg->sig0);
dns_message_puttemprdataset(msg, &msg->sig0);
}
}
isc_result_t
dns_message_firstname(dns_message_t *msg, dns_section_t section) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(VALID_NAMED_SECTION(section));
msg->cursors[section] = ISC_LIST_HEAD(msg->sections[section]);
if (msg->cursors[section] == NULL)
return (ISC_R_NOMORE);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_nextname(dns_message_t *msg, dns_section_t section) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(VALID_NAMED_SECTION(section));
REQUIRE(msg->cursors[section] != NULL);
msg->cursors[section] = ISC_LIST_NEXT(msg->cursors[section], link);
if (msg->cursors[section] == NULL)
return (ISC_R_NOMORE);
return (ISC_R_SUCCESS);
}
void
dns_message_currentname(dns_message_t *msg, dns_section_t section,
dns_name_t **name)
{
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(VALID_NAMED_SECTION(section));
REQUIRE(name != NULL && *name == NULL);
REQUIRE(msg->cursors[section] != NULL);
*name = msg->cursors[section];
}
isc_result_t
dns_message_findname(dns_message_t *msg, dns_section_t section,
dns_name_t *target, dns_rdatatype_t type,
dns_rdatatype_t covers, dns_name_t **name,
dns_rdataset_t **rdataset)
{
dns_name_t *foundname;
isc_result_t result;
/*
* XXX These requirements are probably too intensive, especially
* where things can be NULL, but as they are they ensure that if
* something is NON-NULL, indicating that the caller expects it
* to be filled in, that we can in fact fill it in.
*/
REQUIRE(msg != NULL);
REQUIRE(VALID_SECTION(section));
REQUIRE(target != NULL);
if (name != NULL)
REQUIRE(*name == NULL);
if (type == dns_rdatatype_any) {
REQUIRE(rdataset == NULL);
} else {
if (rdataset != NULL)
REQUIRE(*rdataset == NULL);
}
result = findname(&foundname, target,
&msg->sections[section]);
if (result == ISC_R_NOTFOUND)
return (DNS_R_NXDOMAIN);
else if (result != ISC_R_SUCCESS)
return (result);
if (name != NULL)
*name = foundname;
/*
* And now look for the type.
*/
if (type == dns_rdatatype_any)
return (ISC_R_SUCCESS);
result = dns_message_findtype(foundname, type, covers, rdataset);
if (result == ISC_R_NOTFOUND)
return (DNS_R_NXRRSET);
return (result);
}
void
dns_message_movename(dns_message_t *msg, dns_name_t *name,
dns_section_t fromsection,
dns_section_t tosection)
{
REQUIRE(msg != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
REQUIRE(name != NULL);
REQUIRE(VALID_NAMED_SECTION(fromsection));
REQUIRE(VALID_NAMED_SECTION(tosection));
/*
* Unlink the name from the old section
*/
ISC_LIST_UNLINK(msg->sections[fromsection], name, link);
ISC_LIST_APPEND(msg->sections[tosection], name, link);
}
void
dns_message_addname(dns_message_t *msg, dns_name_t *name,
dns_section_t section)
{
REQUIRE(msg != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
REQUIRE(name != NULL);
REQUIRE(VALID_NAMED_SECTION(section));
ISC_LIST_APPEND(msg->sections[section], name, link);
}
void
dns_message_removename(dns_message_t *msg, dns_name_t *name,
dns_section_t section)
{
REQUIRE(msg != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
REQUIRE(name != NULL);
REQUIRE(VALID_NAMED_SECTION(section));
ISC_LIST_UNLINK(msg->sections[section], name, link);
}
isc_result_t
dns_message_gettempname(dns_message_t *msg, dns_name_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item == NULL);
*item = isc_mempool_get(msg->namepool);
if (*item == NULL)
return (ISC_R_NOMEMORY);
dns_name_init(*item, NULL);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_gettempoffsets(dns_message_t *msg, dns_offsets_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item == NULL);
*item = newoffsets(msg);
if (*item == NULL)
return (ISC_R_NOMEMORY);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_gettemprdata(dns_message_t *msg, dns_rdata_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item == NULL);
*item = newrdata(msg);
if (*item == NULL)
return (ISC_R_NOMEMORY);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_gettemprdataset(dns_message_t *msg, dns_rdataset_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item == NULL);
*item = isc_mempool_get(msg->rdspool);
if (*item == NULL)
return (ISC_R_NOMEMORY);
dns_rdataset_init(*item);
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_gettemprdatalist(dns_message_t *msg, dns_rdatalist_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item == NULL);
*item = newrdatalist(msg);
if (*item == NULL)
return (ISC_R_NOMEMORY);
return (ISC_R_SUCCESS);
}
void
dns_message_puttempname(dns_message_t *msg, dns_name_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item != NULL);
if (dns_name_dynamic(*item))
dns_name_free(*item, msg->mctx);
isc_mempool_put(msg->namepool, *item);
*item = NULL;
}
void
dns_message_puttemprdata(dns_message_t *msg, dns_rdata_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item != NULL);
releaserdata(msg, *item);
*item = NULL;
}
void
dns_message_puttemprdataset(dns_message_t *msg, dns_rdataset_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item != NULL);
REQUIRE(!dns_rdataset_isassociated(*item));
isc_mempool_put(msg->rdspool, *item);
*item = NULL;
}
void
dns_message_puttemprdatalist(dns_message_t *msg, dns_rdatalist_t **item) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(item != NULL && *item != NULL);
releaserdatalist(msg, *item);
*item = NULL;
}
isc_result_t
dns_message_peekheader(isc_buffer_t *source, dns_messageid_t *idp,
unsigned int *flagsp)
{
isc_region_t r;
isc_buffer_t buffer;
dns_messageid_t id;
unsigned int flags;
REQUIRE(source != NULL);
buffer = *source;
isc_buffer_remainingregion(&buffer, &r);
if (r.length < DNS_MESSAGE_HEADERLEN)
return (ISC_R_UNEXPECTEDEND);
id = isc_buffer_getuint16(&buffer);
flags = isc_buffer_getuint16(&buffer);
flags &= DNS_MESSAGE_FLAG_MASK;
if (flagsp != NULL)
*flagsp = flags;
if (idp != NULL)
*idp = id;
return (ISC_R_SUCCESS);
}
isc_result_t
dns_message_reply(dns_message_t *msg, isc_boolean_t want_question_section) {
unsigned int first_section;
isc_result_t result;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE((msg->flags & DNS_MESSAGEFLAG_QR) == 0);
if (!msg->header_ok)
return (DNS_R_FORMERR);
if (msg->opcode != dns_opcode_query &&
msg->opcode != dns_opcode_notify)
want_question_section = ISC_FALSE;
if (msg->opcode == dns_opcode_update)
first_section = DNS_SECTION_ADDITIONAL;
else if (want_question_section) {
if (!msg->question_ok)
return (DNS_R_FORMERR);
first_section = DNS_SECTION_ANSWER;
} else
first_section = DNS_SECTION_QUESTION;
msg->from_to_wire = DNS_MESSAGE_INTENTRENDER;
msgresetnames(msg, first_section);
msgresetopt(msg);
msgresetsigs(msg, ISC_TRUE);
msginitprivate(msg);
/*
* We now clear most flags and then set QR, ensuring that the
* reply's flags will be in a reasonable state.
*/
msg->flags &= DNS_MESSAGE_REPLYPRESERVE;
msg->flags |= DNS_MESSAGEFLAG_QR;
/*
* This saves the query TSIG status, if the query was signed, and
* reserves space in the reply for the TSIG.
*/
if (msg->tsigkey != NULL) {
unsigned int otherlen = 0;
msg->querytsigstatus = msg->tsigstatus;
msg->tsigstatus = dns_rcode_noerror;
if (msg->querytsigstatus == dns_tsigerror_badtime)
otherlen = 6;
msg->sig_reserved = spacefortsig(msg->tsigkey, otherlen);
result = dns_message_renderreserve(msg, msg->sig_reserved);
if (result != ISC_R_SUCCESS) {
msg->sig_reserved = 0;
return (result);
}
}
if (msg->saved.base != NULL) {
msg->query.base = msg->saved.base;
msg->query.length = msg->saved.length;
msg->free_query = msg->free_saved;
msg->saved.base = NULL;
msg->saved.length = 0;
msg->free_saved = 0;
}
return (ISC_R_SUCCESS);
}
dns_rdataset_t *
dns_message_getopt(dns_message_t *msg) {
/*
* Get the OPT record for 'msg'.
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
return (msg->opt);
}
isc_result_t
dns_message_setopt(dns_message_t *msg, dns_rdataset_t *opt) {
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
/*
* Set the OPT record for 'msg'.
*/
/*
* The space required for an OPT record is:
*
* 1 byte for the name
* 2 bytes for the type
* 2 bytes for the class
* 4 bytes for the ttl
* 2 bytes for the rdata length
* ---------------------------------
* 11 bytes
*
* plus the length of the rdata.
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(opt->type == dns_rdatatype_opt);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
REQUIRE(msg->state == DNS_SECTION_ANY);
msgresetopt(msg);
result = dns_rdataset_first(opt);
if (result != ISC_R_SUCCESS)
goto cleanup;
dns_rdataset_current(opt, &rdata);
msg->opt_reserved = 11 + rdata.length;
result = dns_message_renderreserve(msg, msg->opt_reserved);
if (result != ISC_R_SUCCESS) {
msg->opt_reserved = 0;
goto cleanup;
}
msg->opt = opt;
return (ISC_R_SUCCESS);
cleanup:
dns_message_puttemprdataset(msg, &opt);
return (result);
}
dns_rdataset_t *
dns_message_gettsig(dns_message_t *msg, dns_name_t **owner) {
/*
* Get the TSIG record and owner for 'msg'.
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(owner == NULL || *owner == NULL);
if (owner != NULL)
*owner = msg->tsigname;
return (msg->tsig);
}
isc_result_t
dns_message_settsigkey(dns_message_t *msg, dns_tsigkey_t *key) {
isc_result_t result;
/*
* Set the TSIG key for 'msg'
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->state == DNS_SECTION_ANY);
if (key == NULL && msg->tsigkey != NULL) {
if (msg->sig_reserved != 0) {
dns_message_renderrelease(msg, msg->sig_reserved);
msg->sig_reserved = 0;
}
dns_tsigkey_detach(&msg->tsigkey);
}
if (key != NULL) {
REQUIRE(msg->tsigkey == NULL && msg->sig0key == NULL);
dns_tsigkey_attach(key, &msg->tsigkey);
if (msg->from_to_wire == DNS_MESSAGE_INTENTRENDER) {
msg->sig_reserved = spacefortsig(msg->tsigkey, 0);
result = dns_message_renderreserve(msg,
msg->sig_reserved);
if (result != ISC_R_SUCCESS) {
dns_tsigkey_detach(&msg->tsigkey);
msg->sig_reserved = 0;
return (result);
}
}
}
return (ISC_R_SUCCESS);
}
dns_tsigkey_t *
dns_message_gettsigkey(dns_message_t *msg) {
/*
* Get the TSIG key for 'msg'
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
return (msg->tsigkey);
}
isc_result_t
dns_message_setquerytsig(dns_message_t *msg, isc_buffer_t *querytsig) {
dns_rdata_t *rdata = NULL;
dns_rdatalist_t *list = NULL;
dns_rdataset_t *set = NULL;
isc_buffer_t *buf = NULL;
isc_region_t r;
isc_result_t result;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->querytsig == NULL);
if (querytsig == NULL)
return (ISC_R_SUCCESS);
result = dns_message_gettemprdata(msg, &rdata);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdatalist(msg, &list);
if (result != ISC_R_SUCCESS)
goto cleanup;
result = dns_message_gettemprdataset(msg, &set);
if (result != ISC_R_SUCCESS)
goto cleanup;
isc_buffer_usedregion(querytsig, &r);
result = isc_buffer_allocate(msg->mctx, &buf, r.length);
if (result != ISC_R_SUCCESS)
goto cleanup;
isc_buffer_putmem(buf, r.base, r.length);
isc_buffer_usedregion(buf, &r);
dns_rdata_init(rdata);
dns_rdata_fromregion(rdata, dns_rdataclass_any, dns_rdatatype_tsig, &r);
dns_message_takebuffer(msg, &buf);
ISC_LIST_INIT(list->rdata);
ISC_LIST_APPEND(list->rdata, rdata, link);
result = dns_rdatalist_tordataset(list, set);
if (result != ISC_R_SUCCESS)
goto cleanup;
msg->querytsig = set;
return (result);
cleanup:
if (rdata != NULL)
dns_message_puttemprdata(msg, &rdata);
if (list != NULL)
dns_message_puttemprdatalist(msg, &list);
if (set != NULL)
dns_message_puttemprdataset(msg, &set);
return (ISC_R_NOMEMORY);
}
isc_result_t
dns_message_getquerytsig(dns_message_t *msg, isc_mem_t *mctx,
isc_buffer_t **querytsig) {
isc_result_t result;
dns_rdata_t rdata = DNS_RDATA_INIT;
isc_region_t r;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(mctx != NULL);
REQUIRE(querytsig != NULL && *querytsig == NULL);
if (msg->tsig == NULL)
return (ISC_R_SUCCESS);
result = dns_rdataset_first(msg->tsig);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_current(msg->tsig, &rdata);
dns_rdata_toregion(&rdata, &r);
result = isc_buffer_allocate(mctx, querytsig, r.length);
if (result != ISC_R_SUCCESS)
return (result);
isc_buffer_putmem(*querytsig, r.base, r.length);
return (ISC_R_SUCCESS);
}
dns_rdataset_t *
dns_message_getsig0(dns_message_t *msg, dns_name_t **owner) {
/*
* Get the SIG(0) record for 'msg'.
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(owner == NULL || *owner == NULL);
if (msg->sig0 != NULL && owner != NULL) {
/* If dns_message_getsig0 is called on a rendered message
* after the SIG(0) has been applied, we need to return the
* root name, not NULL.
*/
if (msg->sig0name == NULL)
*owner = dns_rootname;
else
*owner = msg->sig0name;
}
return (msg->sig0);
}
isc_result_t
dns_message_setsig0key(dns_message_t *msg, dst_key_t *key) {
isc_region_t r;
unsigned int x;
isc_result_t result;
/*
* Set the SIG(0) key for 'msg'
*/
/*
* The space required for an SIG(0) record is:
*
* 1 byte for the name
* 2 bytes for the type
* 2 bytes for the class
* 4 bytes for the ttl
* 2 bytes for the type covered
* 1 byte for the algorithm
* 1 bytes for the labels
* 4 bytes for the original ttl
* 4 bytes for the signature expiration
* 4 bytes for the signature inception
* 2 bytes for the key tag
* n bytes for the signer's name
* x bytes for the signature
* ---------------------------------
* 27 + n + x bytes
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTRENDER);
REQUIRE(msg->state == DNS_SECTION_ANY);
if (key != NULL) {
REQUIRE(msg->sig0key == NULL && msg->tsigkey == NULL);
dns_name_toregion(dst_key_name(key), &r);
result = dst_key_sigsize(key, &x);
if (result != ISC_R_SUCCESS) {
msg->sig_reserved = 0;
return (result);
}
msg->sig_reserved = 27 + r.length + x;
result = dns_message_renderreserve(msg, msg->sig_reserved);
if (result != ISC_R_SUCCESS) {
msg->sig_reserved = 0;
return (result);
}
msg->sig0key = key;
}
return (ISC_R_SUCCESS);
}
dst_key_t *
dns_message_getsig0key(dns_message_t *msg) {
/*
* Get the SIG(0) key for 'msg'
*/
REQUIRE(DNS_MESSAGE_VALID(msg));
return (msg->sig0key);
}
void
dns_message_takebuffer(dns_message_t *msg, isc_buffer_t **buffer) {
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(buffer != NULL);
REQUIRE(ISC_BUFFER_VALID(*buffer));
ISC_LIST_APPEND(msg->cleanup, *buffer, link);
*buffer = NULL;
}
isc_result_t
dns_message_signer(dns_message_t *msg, dns_name_t *signer) {
isc_result_t result = ISC_R_SUCCESS;
dns_rdata_t rdata = DNS_RDATA_INIT;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(signer != NULL);
REQUIRE(msg->from_to_wire == DNS_MESSAGE_INTENTPARSE);
if (msg->tsig == NULL && msg->sig0 == NULL)
return (ISC_R_NOTFOUND);
if (msg->verify_attempted == 0)
return (DNS_R_NOTVERIFIEDYET);
if (!dns_name_hasbuffer(signer)) {
isc_buffer_t *dynbuf = NULL;
result = isc_buffer_allocate(msg->mctx, &dynbuf, 512);
if (result != ISC_R_SUCCESS)
return (result);
dns_name_setbuffer(signer, dynbuf);
dns_message_takebuffer(msg, &dynbuf);
}
if (msg->sig0 != NULL) {
dns_rdata_sig_t sig;
result = dns_rdataset_first(msg->sig0);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(msg->sig0, &rdata);
result = dns_rdata_tostruct(&rdata, &sig, NULL);
if (result != ISC_R_SUCCESS)
return (result);
if (msg->verified_sig && msg->sig0status == dns_rcode_noerror)
result = ISC_R_SUCCESS;
else
result = DNS_R_SIGINVALID;
dns_name_clone(&sig.signer, signer);
dns_rdata_freestruct(&sig);
} else {
dns_name_t *identity;
dns_rdata_any_tsig_t tsig;
result = dns_rdataset_first(msg->tsig);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(msg->tsig, &rdata);
result = dns_rdata_tostruct(&rdata, &tsig, NULL);
if (msg->tsigstatus != dns_rcode_noerror)
result = DNS_R_TSIGVERIFYFAILURE;
else if (tsig.error != dns_rcode_noerror)
result = DNS_R_TSIGERRORSET;
else
result = ISC_R_SUCCESS;
dns_rdata_freestruct(&tsig);
if (msg->tsigkey == NULL) {
/*
* If msg->tsigstatus & tsig.error are both
* dns_rcode_noerror, the message must have been
* verified, which means msg->tsigkey will be
* non-NULL.
*/
INSIST(result != ISC_R_SUCCESS);
} else {
identity = dns_tsigkey_identity(msg->tsigkey);
if (identity == NULL) {
if (result == ISC_R_SUCCESS)
result = DNS_R_NOIDENTITY;
identity = &msg->tsigkey->name;
}
dns_name_clone(identity, signer);
}
}
return (result);
}
void
dns_message_resetsig(dns_message_t *msg) {
REQUIRE(DNS_MESSAGE_VALID(msg));
msg->verified_sig = 0;
msg->verify_attempted = 0;
msg->tsigstatus = dns_rcode_noerror;
msg->sig0status = dns_rcode_noerror;
msg->timeadjust = 0;
if (msg->tsigkey != NULL) {
dns_tsigkey_detach(&msg->tsigkey);
msg->tsigkey = NULL;
}
}
isc_result_t
dns_message_rechecksig(dns_message_t *msg, dns_view_t *view) {
dns_message_resetsig(msg);
return (dns_message_checksig(msg, view));
}
#ifdef SKAN_MSG_DEBUG
void
dns_message_dumpsig(dns_message_t *msg, char *txt1) {
dns_rdata_t querytsigrdata = DNS_RDATA_INIT;
dns_rdata_any_tsig_t querytsig;
isc_result_t result;
if (msg->tsig != NULL) {
result = dns_rdataset_first(msg->tsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(msg->tsig, &querytsigrdata);
result = dns_rdata_tostruct(&querytsigrdata, &querytsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
hexdump(txt1, "TSIG", querytsig.signature,
querytsig.siglen);
}
if (msg->querytsig != NULL) {
result = dns_rdataset_first(msg->querytsig);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
dns_rdataset_current(msg->querytsig, &querytsigrdata);
result = dns_rdata_tostruct(&querytsigrdata, &querytsig, NULL);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
hexdump(txt1, "QUERYTSIG", querytsig.signature,
querytsig.siglen);
}
}
#endif
isc_result_t
dns_message_checksig(dns_message_t *msg, dns_view_t *view) {
isc_buffer_t b, msgb;
REQUIRE(DNS_MESSAGE_VALID(msg));
if (msg->tsigkey == NULL && msg->tsig == NULL && msg->sig0 == NULL)
return (ISC_R_SUCCESS);
INSIST(msg->saved.base != NULL);
isc_buffer_init(&msgb, msg->saved.base, msg->saved.length);
isc_buffer_add(&msgb, msg->saved.length);
if (msg->tsigkey != NULL || msg->tsig != NULL) {
#ifdef SKAN_MSG_DEBUG
dns_message_dumpsig(msg, "dns_message_checksig#1");
#endif
if (view != NULL)
return (dns_view_checksig(view, &msgb, msg));
else
return (dns_tsig_verify(&msgb, msg, NULL, NULL));
} else {
dns_rdata_t rdata = DNS_RDATA_INIT;
dns_rdata_sig_t sig;
dns_rdataset_t keyset;
isc_result_t result;
result = dns_rdataset_first(msg->sig0);
INSIST(result == ISC_R_SUCCESS);
dns_rdataset_current(msg->sig0, &rdata);
/*
* This can occur when the message is a dynamic update, since
* the rdata length checking is relaxed. This should not
* happen in a well-formed message, since the SIG(0) is only
* looked for in the additional section, and the dynamic update
* meta-records are in the prerequisite and update sections.
*/
if (rdata.length == 0)
return (ISC_R_UNEXPECTEDEND);
result = dns_rdata_tostruct(&rdata, &sig, msg->mctx);
if (result != ISC_R_SUCCESS)
return (result);
dns_rdataset_init(&keyset);
if (view == NULL)
return (DNS_R_KEYUNAUTHORIZED);
result = dns_view_simplefind(view, &sig.signer,
dns_rdatatype_key /* SIG(0) */,
0, 0, ISC_FALSE, &keyset, NULL);
if (result != ISC_R_SUCCESS) {
/* XXXBEW Should possibly create a fetch here */
result = DNS_R_KEYUNAUTHORIZED;
goto freesig;
} else if (keyset.trust < dns_trust_secure) {
/* XXXBEW Should call a validator here */
result = DNS_R_KEYUNAUTHORIZED;
goto freesig;
}
result = dns_rdataset_first(&keyset);
INSIST(result == ISC_R_SUCCESS);
for (;
result == ISC_R_SUCCESS;
result = dns_rdataset_next(&keyset))
{
dst_key_t *key = NULL;
dns_rdata_reset(&rdata);
dns_rdataset_current(&keyset, &rdata);
isc_buffer_init(&b, rdata.data, rdata.length);
isc_buffer_add(&b, rdata.length);
result = dst_key_fromdns(&sig.signer, rdata.rdclass,
&b, view->mctx, &key);
if (result != ISC_R_SUCCESS)
continue;
if (dst_key_alg(key) != sig.algorithm ||
dst_key_id(key) != sig.keyid ||
!(dst_key_proto(key) == DNS_KEYPROTO_DNSSEC ||
dst_key_proto(key) == DNS_KEYPROTO_ANY))
{
dst_key_free(&key);
continue;
}
result = dns_dnssec_verifymessage(&msgb, msg, key);
dst_key_free(&key);
if (result == ISC_R_SUCCESS)
break;
}
if (result == ISC_R_NOMORE)
result = DNS_R_KEYUNAUTHORIZED;
freesig:
if (dns_rdataset_isassociated(&keyset))
dns_rdataset_disassociate(&keyset);
dns_rdata_freestruct(&sig);
return (result);
}
}
isc_result_t
dns_message_sectiontotext(dns_message_t *msg, dns_section_t section,
const dns_master_style_t *style,
dns_messagetextflag_t flags,
isc_buffer_t *target) {
dns_name_t *name, empty_name;
dns_rdataset_t *rdataset;
isc_result_t result;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(target != NULL);
REQUIRE(VALID_SECTION(section));
if (ISC_LIST_EMPTY(msg->sections[section]))
return (ISC_R_SUCCESS);
if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0) {
ADD_STRING(target, ";; ");
if (msg->opcode != dns_opcode_update) {
ADD_STRING(target, sectiontext[section]);
} else {
ADD_STRING(target, updsectiontext[section]);
}
ADD_STRING(target, " SECTION:\n");
}
dns_name_init(&empty_name, NULL);
result = dns_message_firstname(msg, section);
if (result != ISC_R_SUCCESS) {
return (result);
}
do {
name = NULL;
dns_message_currentname(msg, section, &name);
for (rdataset = ISC_LIST_HEAD(name->list);
rdataset != NULL;
rdataset = ISC_LIST_NEXT(rdataset, link)) {
if (section == DNS_SECTION_QUESTION) {
ADD_STRING(target, ";");
result = dns_master_questiontotext(name,
rdataset,
style,
target);
} else {
result = dns_master_rdatasettotext(name,
rdataset,
style,
target);
}
if (result != ISC_R_SUCCESS)
return (result);
}
result = dns_message_nextname(msg, section);
} while (result == ISC_R_SUCCESS);
if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
(flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, "\n");
if (result == ISC_R_NOMORE)
result = ISC_R_SUCCESS;
return (result);
}
isc_result_t
dns_message_pseudosectiontotext(dns_message_t *msg,
dns_pseudosection_t section,
const dns_master_style_t *style,
dns_messagetextflag_t flags,
isc_buffer_t *target) {
dns_rdataset_t *ps = NULL;
dns_name_t *name = NULL;
isc_result_t result;
char buf[sizeof("1234567890")];
isc_uint32_t mbz;
dns_rdata_t rdata;
isc_buffer_t optbuf;
isc_uint16_t optcode, optlen;
unsigned char *optdata;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(target != NULL);
REQUIRE(VALID_PSEUDOSECTION(section));
switch (section) {
case DNS_PSEUDOSECTION_OPT:
ps = dns_message_getopt(msg);
if (ps == NULL)
return (ISC_R_SUCCESS);
if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, ";; OPT PSEUDOSECTION:\n");
ADD_STRING(target, "; EDNS: version: ");
snprintf(buf, sizeof(buf), "%u",
(unsigned int)((ps->ttl & 0x00ff0000) >> 16));
ADD_STRING(target, buf);
ADD_STRING(target, ", flags:");
if ((ps->ttl & DNS_MESSAGEEXTFLAG_DO) != 0)
ADD_STRING(target, " do");
mbz = ps->ttl & 0xffff;
mbz &= ~DNS_MESSAGEEXTFLAG_DO; /* Known Flags. */
if (mbz != 0) {
ADD_STRING(target, "; MBZ: ");
snprintf(buf, sizeof(buf), "%.4x ", mbz);
ADD_STRING(target, buf);
ADD_STRING(target, ", udp: ");
} else
ADD_STRING(target, "; udp: ");
snprintf(buf, sizeof(buf), "%u\n", (unsigned int)ps->rdclass);
ADD_STRING(target, buf);
result = dns_rdataset_first(ps);
if (result != ISC_R_SUCCESS)
return (ISC_R_SUCCESS);
/* Print EDNS info, if any */
dns_rdata_init(&rdata);
dns_rdataset_current(ps, &rdata);
isc_buffer_init(&optbuf, rdata.data, rdata.length);
isc_buffer_add(&optbuf, rdata.length);
while (isc_buffer_remaininglength(&optbuf) != 0) {
INSIST(isc_buffer_remaininglength(&optbuf) >= 4U);
optcode = isc_buffer_getuint16(&optbuf);
optlen = isc_buffer_getuint16(&optbuf);
INSIST(isc_buffer_remaininglength(&optbuf) >= optlen);
if (optcode == DNS_OPT_NSID) {
ADD_STRING(target, "; NSID");
} else {
ADD_STRING(target, "; OPT=");
sprintf(buf, "%u", optcode);
ADD_STRING(target, buf);
}
if (optlen != 0) {
int i;
ADD_STRING(target, ": ");
optdata = isc_buffer_current(&optbuf);
for (i = 0; i < optlen; i++) {
sprintf(buf, "%02x ", optdata[i]);
ADD_STRING(target, buf);
}
for (i = 0; i < optlen; i++) {
ADD_STRING(target, " (");
if (isprint(optdata[i]))
isc_buffer_putmem(target,
&optdata[i],
1);
else
isc_buffer_putstr(target, ".");
ADD_STRING(target, ")");
}
isc_buffer_forward(&optbuf, optlen);
}
ADD_STRING(target, "\n");
}
return (ISC_R_SUCCESS);
case DNS_PSEUDOSECTION_TSIG:
ps = dns_message_gettsig(msg, &name);
if (ps == NULL)
return (ISC_R_SUCCESS);
if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, ";; TSIG PSEUDOSECTION:\n");
result = dns_master_rdatasettotext(name, ps, style, target);
if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
(flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, "\n");
return (result);
case DNS_PSEUDOSECTION_SIG0:
ps = dns_message_getsig0(msg, &name);
if (ps == NULL)
return (ISC_R_SUCCESS);
if ((flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, ";; SIG0 PSEUDOSECTION:\n");
result = dns_master_rdatasettotext(name, ps, style, target);
if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0 &&
(flags & DNS_MESSAGETEXTFLAG_NOCOMMENTS) == 0)
ADD_STRING(target, "\n");
return (result);
}
return (ISC_R_UNEXPECTED);
}
isc_result_t
dns_message_totext(dns_message_t *msg, const dns_master_style_t *style,
dns_messagetextflag_t flags, isc_buffer_t *target) {
char buf[sizeof("1234567890")];
isc_result_t result;
REQUIRE(DNS_MESSAGE_VALID(msg));
REQUIRE(target != NULL);
if ((flags & DNS_MESSAGETEXTFLAG_NOHEADERS) == 0) {
ADD_STRING(target, ";; ->>HEADER<<- opcode: ");
ADD_STRING(target, opcodetext[msg->opcode]);
ADD_STRING(target, ", status: ");
if (msg->rcode < (sizeof(rcodetext)/sizeof(rcodetext[0]))) {
ADD_STRING(target, rcodetext[msg->rcode]);
} else {
snprintf(buf, sizeof(buf), "%4u", msg->rcode);
ADD_STRING(target, buf);
}
ADD_STRING(target, ", id: ");
snprintf(buf, sizeof(buf), "%6u", msg->id);
ADD_STRING(target, buf);
ADD_STRING(target, "\n;; flags:");
if ((msg->flags & DNS_MESSAGEFLAG_QR) != 0)
ADD_STRING(target, " qr");
if ((msg->flags & DNS_MESSAGEFLAG_AA) != 0)
ADD_STRING(target, " aa");
if ((msg->flags & DNS_MESSAGEFLAG_TC) != 0)
ADD_STRING(target, " tc");
if ((msg->flags & DNS_MESSAGEFLAG_RD) != 0)
ADD_STRING(target, " rd");
if ((msg->flags & DNS_MESSAGEFLAG_RA) != 0)
ADD_STRING(target, " ra");
if ((msg->flags & DNS_MESSAGEFLAG_AD) != 0)
ADD_STRING(target, " ad");
if ((msg->flags & DNS_MESSAGEFLAG_CD) != 0)
ADD_STRING(target, " cd");
/*
* The final unnamed flag must be zero.
*/
if ((msg->flags & 0x0040U) != 0)
ADD_STRING(target, "; MBZ: 0x4");
if (msg->opcode != dns_opcode_update) {
ADD_STRING(target, "; QUESTION: ");
} else {
ADD_STRING(target, "; ZONE: ");
}
snprintf(buf, sizeof(buf), "%1u",
msg->counts[DNS_SECTION_QUESTION]);
ADD_STRING(target, buf);
if (msg->opcode != dns_opcode_update) {
ADD_STRING(target, ", ANSWER: ");
} else {
ADD_STRING(target, ", PREREQ: ");
}
snprintf(buf, sizeof(buf), "%1u",
msg->counts[DNS_SECTION_ANSWER]);
ADD_STRING(target, buf);
if (msg->opcode != dns_opcode_update) {
ADD_STRING(target, ", AUTHORITY: ");
} else {
ADD_STRING(target, ", UPDATE: ");
}
snprintf(buf, sizeof(buf), "%1u",
msg->counts[DNS_SECTION_AUTHORITY]);
ADD_STRING(target, buf);
ADD_STRING(target, ", ADDITIONAL: ");
snprintf(buf, sizeof(buf), "%1u",
msg->counts[DNS_SECTION_ADDITIONAL]);
ADD_STRING(target, buf);
ADD_STRING(target, "\n");
}
result = dns_message_pseudosectiontotext(msg,
DNS_PSEUDOSECTION_OPT,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_sectiontotext(msg, DNS_SECTION_QUESTION,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_sectiontotext(msg, DNS_SECTION_ANSWER,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_sectiontotext(msg, DNS_SECTION_AUTHORITY,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_sectiontotext(msg, DNS_SECTION_ADDITIONAL,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_pseudosectiontotext(msg,
DNS_PSEUDOSECTION_TSIG,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
result = dns_message_pseudosectiontotext(msg,
DNS_PSEUDOSECTION_SIG0,
style, flags, target);
if (result != ISC_R_SUCCESS)
return (result);
return (ISC_R_SUCCESS);
}
isc_region_t *
dns_message_getrawmessage(dns_message_t *msg) {
REQUIRE(DNS_MESSAGE_VALID(msg));
return (&msg->saved);
}
void
dns_message_setsortorder(dns_message_t *msg, dns_rdatasetorderfunc_t order,
const void *order_arg)
{
REQUIRE(DNS_MESSAGE_VALID(msg));
msg->order = order;
msg->order_arg = order_arg;
}
void
dns_message_settimeadjust(dns_message_t *msg, int timeadjust) {
REQUIRE(DNS_MESSAGE_VALID(msg));
msg->timeadjust = timeadjust;
}
int
dns_message_gettimeadjust(dns_message_t *msg) {
REQUIRE(DNS_MESSAGE_VALID(msg));
return (msg->timeadjust);
}
isc_result_t
dns_opcode_totext(dns_opcode_t opcode, isc_buffer_t *target) {
REQUIRE(opcode < 16);
if (isc_buffer_availablelength(target) < strlen(opcodetext[opcode]))
return (ISC_R_NOSPACE);
isc_buffer_putstr(target, opcodetext[opcode]);
return (ISC_R_SUCCESS);
}
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