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freebsd-nq/contrib/unbound/dnstap/unbound-dnstap-socket.c
Cy Schubert 24e3652200 unbount: Vendor import 1.14.0rc1 
This vendor import was requested by glebius@ as it should fix unbound
crashes.

Reported by:	glebius
MFC after:	1 week
2021-12-02 22:11:04 -08:00

1556 lines
40 KiB
C
Raw Blame History

/*
* dnstap/unbound-dnstap-socket.c - debug program that listens for DNSTAP logs.
*
* Copyright (c) 2020, 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 program listens on a DNSTAP socket for logged messages.
*/
#include "config.h"
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <ctype.h>
#ifdef HAVE_SYS_UN_H
#include <sys/un.h>
#endif
#include <openssl/ssl.h>
#include <openssl/rand.h>
#include <openssl/err.h>
#include "dnstap/dtstream.h"
#include "dnstap/dnstap_fstrm.h"
#include "util/log.h"
#include "util/ub_event.h"
#include "util/net_help.h"
#include "services/listen_dnsport.h"
#include "sldns/sbuffer.h"
#include "sldns/wire2str.h"
#ifdef USE_DNSTAP
#include <protobuf-c/protobuf-c.h>
#include "dnstap/dnstap.pb-c.h"
#endif /* USE_DNSTAP */
#include "util/config_file.h"
/** listen backlog on TCP connections for dnstap logs */
#define LISTEN_BACKLOG 16
/** usage information for streamtcp */
static void usage(char* argv[])
{
printf("usage: %s [options]\n", argv[0]);
printf(" Listen to dnstap messages\n");
printf("stdout has dnstap log, stderr has verbose server log\n");
printf("-u <socketpath> listen to unix socket with this file name\n");
printf("-s <serverip[@port]> listen for TCP on the IP and port\n");
printf("-t <serverip[@port]> listen for TLS on IP and port\n");
printf("-x <server.key> server key file for TLS service\n");
printf("-y <server.pem> server cert file for TLS service\n");
printf("-z <verify.pem> cert file to verify client connections\n");
printf("-l long format for DNS printout\n");
printf("-v more verbose log output\n");
printf("-h this help text\n");
exit(1);
}
/** long format option, for multiline printout per message */
static int longformat = 0;
struct tap_socket_list;
struct tap_socket;
/** main tap callback data */
struct main_tap_data {
/** the event base (to loopexit) */
struct ub_event_base* base;
/** the list of accept sockets */
struct tap_socket_list* acceptlist;
};
/** tap callback variables */
struct tap_data {
/** the fd */
int fd;
/** the ub event */
struct ub_event* ev;
/** the SSL for TLS streams */
SSL* ssl;
/** is the ssl handshake done */
int ssl_handshake_done;
/** we are briefly waiting to write (in the struct event) */
int ssl_brief_write;
/** string that identifies the socket (or NULL), like IP address */
char* id;
/** have we read the length, and how many bytes of it */
int len_done;
/** have we read the data, and how many bytes of it */
size_t data_done;
/** are we reading a control frame */
int control_frame;
/** are we bi-directional (if false, uni-directional) */
int is_bidirectional;
/** data of the frame */
uint8_t* frame;
/** length of this frame */
size_t len;
};
/** list of sockets */
struct tap_socket_list {
/** next in list */
struct tap_socket_list* next;
/** the socket */
struct tap_socket* s;
};
/** tap socket */
struct tap_socket {
/** fd of socket */
int fd;
/** the event for it */
struct ub_event *ev;
/** has the event been added */
int ev_added;
/** the callback, for the event, ev_cb(fd, bits, arg) */
void (*ev_cb)(int, short, void*);
/** data element, (arg for the tap_socket struct) */
void* data;
/** socketpath, if this is an AF_LOCAL socket */
char* socketpath;
/** IP, if this is a TCP socket */
char* ip;
/** for a TLS socket, the tls context */
SSL_CTX* sslctx;
};
/** del the tap event */
static void tap_socket_delev(struct tap_socket* s)
{
if(!s) return;
if(!s->ev) return;
if(!s->ev_added) return;
ub_event_del(s->ev);
s->ev_added = 0;
}
/** close the tap socket */
static void tap_socket_close(struct tap_socket* s)
{
if(!s) return;
if(s->fd == -1) return;
close(s->fd);
s->fd = -1;
}
/** delete tap socket */
static void tap_socket_delete(struct tap_socket* s)
{
if(!s) return;
#ifdef HAVE_SSL
SSL_CTX_free(s->sslctx);
#endif
ub_event_free(s->ev);
free(s->socketpath);
free(s->ip);
free(s);
}
/** create new socket (unconnected, not base-added), or NULL malloc fail */
static struct tap_socket* tap_socket_new_local(char* socketpath,
void (*ev_cb)(int, short, void*), void* data)
{
struct tap_socket* s = calloc(1, sizeof(*s));
if(!s) {
log_err("malloc failure");
return NULL;
}
s->socketpath = strdup(socketpath);
if(!s->socketpath) {
free(s);
log_err("malloc failure");
return NULL;
}
s->fd = -1;
s->ev_cb = ev_cb;
s->data = data;
return s;
}
/** create new socket (unconnected, not base-added), or NULL malloc fail */
static struct tap_socket* tap_socket_new_tcpaccept(char* ip,
void (*ev_cb)(int, short, void*), void* data)
{
struct tap_socket* s = calloc(1, sizeof(*s));
if(!s) {
log_err("malloc failure");
return NULL;
}
s->ip = strdup(ip);
if(!s->ip) {
free(s);
log_err("malloc failure");
return NULL;
}
s->fd = -1;
s->ev_cb = ev_cb;
s->data = data;
return s;
}
/** create new socket (unconnected, not base-added), or NULL malloc fail */
static struct tap_socket* tap_socket_new_tlsaccept(char* ip,
void (*ev_cb)(int, short, void*), void* data, char* server_key,
char* server_cert, char* verifypem)
{
struct tap_socket* s = calloc(1, sizeof(*s));
if(!s) {
log_err("malloc failure");
return NULL;
}
s->ip = strdup(ip);
if(!s->ip) {
free(s);
log_err("malloc failure");
return NULL;
}
s->fd = -1;
s->ev_cb = ev_cb;
s->data = data;
s->sslctx = listen_sslctx_create(server_key, server_cert, verifypem);
if(!s->sslctx) {
log_err("could not create ssl context");
free(s->ip);
free(s);
return NULL;
}
return s;
}
/** setup tcp accept socket on IP string */
static int make_tcp_accept(char* ip)
{
#ifdef SO_REUSEADDR
int on = 1;
#endif
struct sockaddr_storage addr;
socklen_t len;
int s;
memset(&addr, 0, sizeof(addr));
len = (socklen_t)sizeof(addr);
if(!extstrtoaddr(ip, &addr, &len)) {
log_err("could not parse IP '%s'", ip);
return -1;
}
if((s = socket(addr.ss_family, SOCK_STREAM, 0)) == -1) {
log_err("can't create socket: %s", sock_strerror(errno));
return -1;
}
#ifdef SO_REUSEADDR
if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
(socklen_t)sizeof(on)) < 0) {
log_err("setsockopt(.. SO_REUSEADDR ..) failed: %s",
sock_strerror(errno));
sock_close(s);
return -1;
}
#endif /* SO_REUSEADDR */
if(bind(s, (struct sockaddr*)&addr, len) != 0) {
log_err_addr("can't bind socket", sock_strerror(errno),
&addr, len);
sock_close(s);
return -1;
}
if(!fd_set_nonblock(s)) {
sock_close(s);
return -1;
}
if(listen(s, LISTEN_BACKLOG) == -1) {
log_err("can't listen: %s", sock_strerror(errno));
sock_close(s);
return -1;
}
return s;
}
/** setup socket on event base */
static int tap_socket_setup(struct tap_socket* s, struct ub_event_base* base)
{
if(s->socketpath) {
/* AF_LOCAL accept socket */
s->fd = create_local_accept_sock(s->socketpath, NULL, 0);
if(s->fd == -1) {
log_err("could not create local socket");
return 0;
}
} else if(s->ip || s->sslctx) {
/* TCP accept socket */
s->fd = make_tcp_accept(s->ip);
if(s->fd == -1) {
log_err("could not create tcp socket");
return 0;
}
}
s->ev = ub_event_new(base, s->fd, UB_EV_READ | UB_EV_PERSIST,
s->ev_cb, s);
if(!s->ev) {
log_err("could not ub_event_new");
return 0;
}
if(ub_event_add(s->ev, NULL) != 0) {
log_err("could not ub_event_add");
return 0;
}
s->ev_added = 1;
return 1;
}
/** add tap socket to list */
static int tap_socket_list_insert(struct tap_socket_list** liststart,
struct tap_socket* s)
{
struct tap_socket_list* entry = (struct tap_socket_list*)
malloc(sizeof(*entry));
if(!entry)
return 0;
entry->next = *liststart;
entry->s = s;
*liststart = entry;
return 1;
}
/** delete the list */
static void tap_socket_list_delete(struct tap_socket_list* list)
{
struct tap_socket_list* e = list, *next;
while(e) {
next = e->next;
tap_socket_delev(e->s);
tap_socket_close(e->s);
tap_socket_delete(e->s);
free(e);
e = next;
}
}
/** setup accept events */
static int tap_socket_list_addevs(struct tap_socket_list* list,
struct ub_event_base* base)
{
struct tap_socket_list* entry;
for(entry = list; entry; entry = entry->next) {
if(!tap_socket_setup(entry->s, base)) {
log_err("could not setup socket");
return 0;
}
}
return 1;
}
#ifdef USE_DNSTAP
/** log control frame contents */
static void log_control_frame(uint8_t* pkt, size_t len)
{
char* desc;
if(verbosity == 0) return;
desc = fstrm_describe_control(pkt, len);
if(!desc) {
log_err("out of memory");
return;
}
log_info("control frame %s", desc);
free(desc);
}
/** convert mtype to string */
static const char* mtype_to_str(enum _Dnstap__Message__Type mtype)
{
switch(mtype) {
case DNSTAP__MESSAGE__TYPE__AUTH_QUERY:
return "AUTH_QUERY";
case DNSTAP__MESSAGE__TYPE__AUTH_RESPONSE:
return "AUTH_RESPONSE";
case DNSTAP__MESSAGE__TYPE__RESOLVER_QUERY:
return "RESOLVER_QUERY";
case DNSTAP__MESSAGE__TYPE__RESOLVER_RESPONSE:
return "RESOLVER_RESPONSE";
case DNSTAP__MESSAGE__TYPE__CLIENT_QUERY:
return "CLIENT_QUERY";
case DNSTAP__MESSAGE__TYPE__CLIENT_RESPONSE:
return "CLIENT_RESPONSE";
case DNSTAP__MESSAGE__TYPE__FORWARDER_QUERY:
return "FORWARDER_QUERY";
case DNSTAP__MESSAGE__TYPE__FORWARDER_RESPONSE:
return "FORWARDER_RESPONSE";
case DNSTAP__MESSAGE__TYPE__STUB_QUERY:
return "STUB_QUERY";
case DNSTAP__MESSAGE__TYPE__STUB_RESPONSE:
return "STUB_RESPONSE";
default: break;
}
return "unknown_message_type";
}
/** convert type address to a string ip4 or ip6, malloced or NULL on fail */
static char* str_of_addr(ProtobufCBinaryData address)
{
char buf[64];
socklen_t len = sizeof(buf);
if(address.len == 4) {
if(inet_ntop(AF_INET, address.data, buf, len)!=0)
return strdup(buf);
} else if(address.len == 16) {
if(inet_ntop(AF_INET6, address.data, buf, len)!=0)
return strdup(buf);
}
return NULL;
}
/** convert message buffer (of dns bytes) to the first qname, type, class,
* malloced or NULL on fail */
static char* q_of_msg(ProtobufCBinaryData message)
{
char buf[300];
/* header, name, type, class minimum to get the query tuple */
if(message.len < 12 + 1 + 4 + 4) return NULL;
if(sldns_wire2str_rrquestion_buf(message.data+12, message.len-12,
buf, sizeof(buf)) != 0) {
/* remove trailing newline, tabs to spaces */
/* remove the newline: */
if(buf[0] != 0) buf[strlen(buf)-1]=0;
/* remove first tab (before type) */
if(strrchr(buf, '\t')) *strrchr(buf, '\t')=' ';
/* remove second tab (before class) */
if(strrchr(buf, '\t')) *strrchr(buf, '\t')=' ';
return strdup(buf);
}
return NULL;
}
/** convert possible string or hex data to string. malloced or NULL */
static char* possible_str(ProtobufCBinaryData str)
{
int is_str = 1;
size_t i;
for(i=0; i<str.len; i++) {
if(!isprint((unsigned char)str.data[i]))
is_str = 0;
}
if(is_str) {
char* res = malloc(str.len+1);
if(res) {
memmove(res, str.data, str.len);
res[str.len] = 0;
return res;
}
} else {
const char* hex = "0123456789ABCDEF";
char* res = malloc(str.len*2+1);
if(res) {
for(i=0; i<str.len; i++) {
res[i*2] = hex[(str.data[i]&0xf0)>>4];
res[i*2+1] = hex[str.data[i]&0x0f];
}
res[str.len*2] = 0;
return res;
}
}
return NULL;
}
/** convert timeval to string, malloced or NULL */
static char* tv_to_str(protobuf_c_boolean has_time_sec, uint64_t time_sec,
protobuf_c_boolean has_time_nsec, uint32_t time_nsec)
{
char buf[64], buf2[256];
struct timeval tv;
time_t time_t_sec;
memset(&tv, 0, sizeof(tv));
if(has_time_sec) tv.tv_sec = time_sec;
if(has_time_nsec) tv.tv_usec = time_nsec;
buf[0]=0;
time_t_sec = tv.tv_sec;
(void)ctime_r(&time_t_sec, buf);
snprintf(buf2, sizeof(buf2), "%u.%9.9u %s",
(unsigned)time_sec, (unsigned)time_nsec, buf);
return strdup(buf2);
}
/** log data frame contents */
static void log_data_frame(uint8_t* pkt, size_t len)
{
Dnstap__Dnstap* d = dnstap__dnstap__unpack(NULL, len, pkt);
const char* mtype = NULL;
char* maddr=NULL, *qinf=NULL;
if(!d) {
log_err("could not unpack");
return;
}
if(d->base.descriptor != &dnstap__dnstap__descriptor) {
log_err("wrong base descriptor");
dnstap__dnstap__free_unpacked(d, NULL);
return;
}
if(d->type != DNSTAP__DNSTAP__TYPE__MESSAGE) {
log_err("dnstap type not type_message");
dnstap__dnstap__free_unpacked(d, NULL);
return;
}
if(d->message) {
mtype = mtype_to_str(d->message->type);
if(d->message->has_query_address)
maddr = str_of_addr(d->message->query_address);
else if(d->message->has_response_address)
maddr = str_of_addr(d->message->response_address);
if(d->message->has_query_message)
qinf = q_of_msg(d->message->query_message);
else if(d->message->has_response_message)
qinf = q_of_msg(d->message->response_message);
} else {
mtype = "nomessage";
}
printf("%s%s%s%s%s\n", mtype, (maddr?" ":""), (maddr?maddr:""),
(qinf?" ":""), (qinf?qinf:""));
free(maddr);
free(qinf);
if(longformat) {
char* id=NULL, *vs=NULL;
if(d->has_identity) {
id=possible_str(d->identity);
}
if(d->has_version) {
vs=possible_str(d->version);
}
if(id || vs)
printf("identity: %s%s%s\n", (id?id:""),
(id&&vs?" ":""), (vs?vs:""));
free(id);
free(vs);
if(d->message && d->message->has_query_message &&
d->message->query_message.data) {
char* qmsg = sldns_wire2str_pkt(
d->message->query_message.data,
d->message->query_message.len);
if(qmsg) {
printf("query_message:\n%s", qmsg);
free(qmsg);
}
}
if(d->message && d->message->has_query_time_sec) {
char* qtv = tv_to_str(d->message->has_query_time_sec,
d->message->query_time_sec,
d->message->has_query_time_nsec,
d->message->query_time_nsec);
if(qtv) {
printf("query_time: %s\n", qtv);
free(qtv);
}
}
if(d->message && d->message->has_response_message &&
d->message->response_message.data) {
char* rmsg = sldns_wire2str_pkt(
d->message->response_message.data,
d->message->response_message.len);
if(rmsg) {
printf("response_message:\n%s", rmsg);
free(rmsg);
}
}
if(d->message && d->message->has_response_time_sec) {
char* rtv = tv_to_str(d->message->has_response_time_sec,
d->message->response_time_sec,
d->message->has_response_time_nsec,
d->message->response_time_nsec);
if(rtv) {
printf("response_time: %s\n", rtv);
free(rtv);
}
}
}
fflush(stdout);
dnstap__dnstap__free_unpacked(d, NULL);
}
#endif /* USE_DNSTAP */
/** receive bytes from fd, prints errors if bad,
* returns 0: closed/error, -1: continue, >0 number of bytes */
static ssize_t receive_bytes(struct tap_data* data, int fd, void* buf,
size_t len)
{
ssize_t ret = recv(fd, buf, len, 0);
if(ret == 0) {
/* closed */
if(verbosity) log_info("dnstap client stream closed from %s",
(data->id?data->id:""));
return 0;
} else if(ret == -1) {
/* error */
#ifndef USE_WINSOCK
if(errno == EINTR || errno == EAGAIN)
return -1;
#else /* USE_WINSOCK */
if(WSAGetLastError() == WSAEINPROGRESS)
return -1;
if(WSAGetLastError() == WSAEWOULDBLOCK) {
ub_winsock_tcp_wouldblock(data->ev, UB_EV_READ);
return -1;
}
#endif
log_err("could not recv: %s", sock_strerror(errno));
if(verbosity) log_info("dnstap client stream closed from %s",
(data->id?data->id:""));
return 0;
}
return ret;
}
/* define routine for have_ssl only to avoid unused function warning */
#ifdef HAVE_SSL
/** set to wait briefly for a write event, for one event call */
static void tap_enable_brief_write(struct tap_data* data)
{
ub_event_del(data->ev);
ub_event_del_bits(data->ev, UB_EV_READ);
ub_event_add_bits(data->ev, UB_EV_WRITE);
if(ub_event_add(data->ev, NULL) != 0)
log_err("could not ub_event_add in tap_enable_brief_write");
data->ssl_brief_write = 1;
}
#endif /* HAVE_SSL */
/* define routine for have_ssl only to avoid unused function warning */
#ifdef HAVE_SSL
/** stop the brief wait for a write event. back to reading. */
static void tap_disable_brief_write(struct tap_data* data)
{
ub_event_del(data->ev);
ub_event_del_bits(data->ev, UB_EV_WRITE);
ub_event_add_bits(data->ev, UB_EV_READ);
if(ub_event_add(data->ev, NULL) != 0)
log_err("could not ub_event_add in tap_disable_brief_write");
data->ssl_brief_write = 0;
}
#endif /* HAVE_SSL */
#ifdef HAVE_SSL
/** receive bytes over ssl stream, prints errors if bad,
* returns 0: closed/error, -1: continue, >0 number of bytes */
static ssize_t ssl_read_bytes(struct tap_data* data, void* buf, size_t len)
{
int r;
ERR_clear_error();
r = SSL_read(data->ssl, buf, len);
if(r <= 0) {
int want = SSL_get_error(data->ssl, r);
if(want == SSL_ERROR_ZERO_RETURN) {
/* closed */
if(verbosity) log_info("dnstap client stream closed from %s",
(data->id?data->id:""));
return 0;
} else if(want == SSL_ERROR_WANT_READ) {
/* continue later */
return -1;
} else if(want == SSL_ERROR_WANT_WRITE) {
/* set to briefly write */
tap_enable_brief_write(data);
return -1;
} else if(want == SSL_ERROR_SYSCALL) {
#ifdef ECONNRESET
if(errno == ECONNRESET && verbosity < 2)
return 0; /* silence reset by peer */
#endif
if(errno != 0)
log_err("SSL_read syscall: %s",
strerror(errno));
if(verbosity) log_info("dnstap client stream closed from %s",
(data->id?data->id:""));
return 0;
}
log_crypto_err("could not SSL_read");
if(verbosity) log_info("dnstap client stream closed from %s",
(data->id?data->id:""));
return 0;
}
return r;
}
#endif /* HAVE_SSL */
/** receive bytes on the tap connection, prints errors if bad,
* returns 0: closed/error, -1: continue, >0 number of bytes */
static ssize_t tap_receive(struct tap_data* data, void* buf, size_t len)
{
#ifdef HAVE_SSL
if(data->ssl)
return ssl_read_bytes(data, buf, len);
#endif
return receive_bytes(data, data->fd, buf, len);
}
/** delete the tap structure */
static void tap_data_free(struct tap_data* data)
{
ub_event_del(data->ev);
ub_event_free(data->ev);
#ifdef HAVE_SSL
SSL_free(data->ssl);
#endif
close(data->fd);
free(data->id);
free(data->frame);
free(data);
}
/** reply with ACCEPT control frame to bidirectional client,
* returns 0 on error */
static int reply_with_accept(struct tap_data* data)
{
#ifdef USE_DNSTAP
/* len includes the escape and framelength */
int r;
size_t len = 0;
void* acceptframe = fstrm_create_control_frame_accept(
DNSTAP_CONTENT_TYPE, &len);
if(!acceptframe) {
log_err("out of memory");
return 0;
}
fd_set_block(data->fd);
if(data->ssl) {
if((r=SSL_write(data->ssl, acceptframe, len)) <= 0) {
if(SSL_get_error(data->ssl, r) == SSL_ERROR_ZERO_RETURN)
log_err("SSL_write, peer closed connection");
else
log_err("could not SSL_write");
fd_set_nonblock(data->fd);
free(acceptframe);
return 0;
}
} else {
if(send(data->fd, acceptframe, len, 0) == -1) {
log_err("send failed: %s", sock_strerror(errno));
fd_set_nonblock(data->fd);
free(acceptframe);
return 0;
}
}
if(verbosity) log_info("sent control frame(accept) content-type:(%s)",
DNSTAP_CONTENT_TYPE);
fd_set_nonblock(data->fd);
free(acceptframe);
return 1;
#else
log_err("no dnstap compiled, no reply");
(void)data;
return 0;
#endif
}
/** reply with FINISH control frame to bidirectional client,
* returns 0 on error */
static int reply_with_finish(int fd)
{
#ifdef USE_DNSTAP
size_t len = 0;
void* finishframe = fstrm_create_control_frame_finish(&len);
if(!finishframe) {
log_err("out of memory");
return 0;
}
fd_set_block(fd);
if(send(fd, finishframe, len, 0) == -1) {
log_err("send failed: %s", sock_strerror(errno));
fd_set_nonblock(fd);
free(finishframe);
return 0;
}
if(verbosity) log_info("sent control frame(finish)");
fd_set_nonblock(fd);
free(finishframe);
return 1;
#else
log_err("no dnstap compiled, no reply");
(void)fd;
return 0;
#endif
}
#ifdef HAVE_SSL
/** check SSL peer certificate, return 0 on fail */
static int tap_check_peer(struct tap_data* data)
{
if((SSL_get_verify_mode(data->ssl)&SSL_VERIFY_PEER)) {
/* verification */
if(SSL_get_verify_result(data->ssl) == X509_V_OK) {
X509* x = SSL_get_peer_certificate(data->ssl);
if(!x) {
if(verbosity) log_info("SSL connection %s"
" failed no certificate", data->id);
return 0;
}
if(verbosity)
log_cert(VERB_ALGO, "peer certificate", x);
#ifdef HAVE_SSL_GET0_PEERNAME
if(SSL_get0_peername(data->ssl)) {
if(verbosity) log_info("SSL connection %s "
"to %s authenticated", data->id,
SSL_get0_peername(data->ssl));
} else {
#endif
if(verbosity) log_info("SSL connection %s "
"authenticated", data->id);
#ifdef HAVE_SSL_GET0_PEERNAME
}
#endif
X509_free(x);
} else {
X509* x = SSL_get_peer_certificate(data->ssl);
if(x) {
if(verbosity)
log_cert(VERB_ALGO, "peer certificate", x);
X509_free(x);
}
if(verbosity) log_info("SSL connection %s failed: "
"failed to authenticate", data->id);
return 0;
}
} else {
/* unauthenticated, the verify peer flag was not set
* in ssl when the ssl object was created from ssl_ctx */
if(verbosity) log_info("SSL connection %s", data->id);
}
return 1;
}
#endif /* HAVE_SSL */
#ifdef HAVE_SSL
/** perform SSL handshake, return 0 to wait for events, 1 if done */
static int tap_handshake(struct tap_data* data)
{
int r;
if(data->ssl_brief_write) {
/* write condition has been satisfied, back to reading */
tap_disable_brief_write(data);
}
if(data->ssl_handshake_done)
return 1;
ERR_clear_error();
r = SSL_do_handshake(data->ssl);
if(r != 1) {
int want = SSL_get_error(data->ssl, r);
if(want == SSL_ERROR_WANT_READ) {
return 0;
} else if(want == SSL_ERROR_WANT_WRITE) {
tap_enable_brief_write(data);
return 0;
} else if(r == 0) {
/* closed */
tap_data_free(data);
return 0;
} else if(want == SSL_ERROR_SYSCALL) {
/* SYSCALL and errno==0 means closed uncleanly */
int silent = 0;
#ifdef EPIPE
if(errno == EPIPE && verbosity < 2)
silent = 1; /* silence 'broken pipe' */
#endif
#ifdef ECONNRESET
if(errno == ECONNRESET && verbosity < 2)
silent = 1; /* silence reset by peer */
#endif
if(errno == 0)
silent = 1;
if(!silent)
log_err("SSL_handshake syscall: %s",
strerror(errno));
tap_data_free(data);
return 0;
} else {
unsigned long err = ERR_get_error();
if(!squelch_err_ssl_handshake(err)) {
log_crypto_err_code("ssl handshake failed",
err);
verbose(VERB_OPS, "ssl handshake failed "
"from %s", data->id);
}
tap_data_free(data);
return 0;
}
}
/* check peer verification */
data->ssl_handshake_done = 1;
if(!tap_check_peer(data)) {
/* closed */
tap_data_free(data);
return 0;
}
return 1;
}
#endif /* HAVE_SSL */
/** callback for dnstap listener */
void dtio_tap_callback(int fd, short ATTR_UNUSED(bits), void* arg)
{
struct tap_data* data = (struct tap_data*)arg;
if(verbosity>=3) log_info("tap callback");
#ifdef HAVE_SSL
if(data->ssl && (!data->ssl_handshake_done ||
data->ssl_brief_write)) {
if(!tap_handshake(data))
return;
}
#endif
while(data->len_done < 4) {
uint32_t l = (uint32_t)data->len;
ssize_t ret = tap_receive(data,
((uint8_t*)&l)+data->len_done, 4-data->len_done);
if(verbosity>=4) log_info("s recv %d", (int)ret);
if(ret == 0) {
/* closed or error */
tap_data_free(data);
return;
} else if(ret == -1) {
/* continue later */
return;
}
data->len_done += ret;
data->len = (size_t)l;
if(data->len_done < 4)
return; /* continue later */
data->len = (size_t)(ntohl(l));
if(verbosity>=3) log_info("length is %d", (int)data->len);
if(data->len == 0) {
/* it is a control frame */
data->control_frame = 1;
/* read controlframelen */
data->len_done = 0;
} else {
/* allocate frame size */
data->frame = calloc(1, data->len);
if(!data->frame) {
log_err("out of memory");
tap_data_free(data);
return;
}
}
}
/* we want to read the full length now */
if(data->data_done < data->len) {
ssize_t r = tap_receive(data, data->frame + data->data_done,
data->len - data->data_done);
if(verbosity>=4) log_info("f recv %d", (int)r);
if(r == 0) {
/* closed or error */
tap_data_free(data);
return;
} else if(r == -1) {
/* continue later */
return;
}
data->data_done += r;
if(data->data_done < data->len)
return; /* continue later */
}
/* we are done with a frame */
if(verbosity>=3) log_info("received %sframe len %d",
(data->control_frame?"control ":""), (int)data->len);
#ifdef USE_DNSTAP
if(data->control_frame)
log_control_frame(data->frame, data->len);
else log_data_frame(data->frame, data->len);
#endif
if(data->len >= 4 && sldns_read_uint32(data->frame) ==
FSTRM_CONTROL_FRAME_READY) {
data->is_bidirectional = 1;
if(verbosity) log_info("bidirectional stream");
if(!reply_with_accept(data)) {
tap_data_free(data);
return;
}
} else if(data->len >= 4 && sldns_read_uint32(data->frame) ==
FSTRM_CONTROL_FRAME_STOP && data->is_bidirectional) {
if(!reply_with_finish(fd)) {
tap_data_free(data);
return;
}
}
/* prepare for next frame */
free(data->frame);
data->frame = NULL;
data->control_frame = 0;
data->len = 0;
data->len_done = 0;
data->data_done = 0;
}
/** callback for main listening file descriptor */
void dtio_mainfdcallback(int fd, short ATTR_UNUSED(bits), void* arg)
{
struct tap_socket* tap_sock = (struct tap_socket*)arg;
struct main_tap_data* maindata = (struct main_tap_data*)
tap_sock->data;
struct tap_data* data;
char* id = NULL;
struct sockaddr_storage addr;
socklen_t addrlen = (socklen_t)sizeof(addr);
int s = accept(fd, (struct sockaddr*)&addr, &addrlen);
if(s == -1) {
#ifndef USE_WINSOCK
/* EINTR is signal interrupt. others are closed connection. */
if( errno == EINTR || errno == EAGAIN
#ifdef EWOULDBLOCK
|| errno == EWOULDBLOCK
#endif
#ifdef ECONNABORTED
|| errno == ECONNABORTED
#endif
#ifdef EPROTO
|| errno == EPROTO
#endif /* EPROTO */
)
return;
#else /* USE_WINSOCK */
if(WSAGetLastError() == WSAEINPROGRESS ||
WSAGetLastError() == WSAECONNRESET)
return;
if(WSAGetLastError() == WSAEWOULDBLOCK) {
ub_winsock_tcp_wouldblock(maindata->ev, UB_EV_READ);
return;
}
#endif
log_err_addr("accept failed", sock_strerror(errno), &addr,
addrlen);
return;
}
fd_set_nonblock(s);
if(verbosity) {
if(addr.ss_family == AF_LOCAL) {
#ifdef HAVE_SYS_UN_H
struct sockaddr_un* usock = calloc(1, sizeof(struct sockaddr_un) + 1);
if(usock) {
socklen_t ulen = sizeof(struct sockaddr_un);
if(getsockname(fd, (struct sockaddr*)usock, &ulen) != -1) {
log_info("accepted new dnstap client from %s", usock->sun_path);
id = strdup(usock->sun_path);
} else {
log_info("accepted new dnstap client");
}
free(usock);
} else {
log_info("accepted new dnstap client");
}
#endif /* HAVE_SYS_UN_H */
} else if(addr.ss_family == AF_INET ||
addr.ss_family == AF_INET6) {
char ip[256];
addr_to_str(&addr, addrlen, ip, sizeof(ip));
log_info("accepted new dnstap client from %s", ip);
id = strdup(ip);
} else {
log_info("accepted new dnstap client");
}
}
data = calloc(1, sizeof(*data));
if(!data) fatal_exit("out of memory");
data->fd = s;
data->id = id;
if(tap_sock->sslctx) {
data->ssl = incoming_ssl_fd(tap_sock->sslctx, data->fd);
if(!data->ssl) fatal_exit("could not SSL_new");
}
data->ev = ub_event_new(maindata->base, s, UB_EV_READ | UB_EV_PERSIST,
&dtio_tap_callback, data);
if(!data->ev) fatal_exit("could not ub_event_new");
if(ub_event_add(data->ev, NULL) != 0) fatal_exit("could not ub_event_add");
}
/** setup local accept sockets */
static void setup_local_list(struct main_tap_data* maindata,
struct config_strlist_head* local_list)
{
struct config_strlist* item;
for(item = local_list->first; item; item = item->next) {
struct tap_socket* s;
s = tap_socket_new_local(item->str, &dtio_mainfdcallback,
maindata);
if(!s) fatal_exit("out of memory");
if(!tap_socket_list_insert(&maindata->acceptlist, s))
fatal_exit("out of memory");
}
}
/** setup tcp accept sockets */
static void setup_tcp_list(struct main_tap_data* maindata,
struct config_strlist_head* tcp_list)
{
struct config_strlist* item;
for(item = tcp_list->first; item; item = item->next) {
struct tap_socket* s;
s = tap_socket_new_tcpaccept(item->str, &dtio_mainfdcallback,
maindata);
if(!s) fatal_exit("out of memory");
if(!tap_socket_list_insert(&maindata->acceptlist, s))
fatal_exit("out of memory");
}
}
/** setup tls accept sockets */
static void setup_tls_list(struct main_tap_data* maindata,
struct config_strlist_head* tls_list, char* server_key,
char* server_cert, char* verifypem)
{
struct config_strlist* item;
for(item = tls_list->first; item; item = item->next) {
struct tap_socket* s;
s = tap_socket_new_tlsaccept(item->str, &dtio_mainfdcallback,
maindata, server_key, server_cert, verifypem);
if(!s) fatal_exit("out of memory");
if(!tap_socket_list_insert(&maindata->acceptlist, s))
fatal_exit("out of memory");
}
}
/** signal variable */
static struct ub_event_base* sig_base = NULL;
/** do we have to quit */
int sig_quit = 0;
/** signal handler for user quit */
static RETSIGTYPE main_sigh(int sig)
{
if(!sig_quit) {
char str[] = "exit on signal \n";
str[15] = '0' + (sig/10)%10;
str[16] = '0' + sig%10;
/* simple cast to void will not silence Wunused-result */
(void)!write(STDERR_FILENO, str, strlen(str));
}
if(sig_base) {
ub_event_base_loopexit(sig_base);
sig_base = NULL;
}
sig_quit = 1;
}
/** setup and run the server to listen to DNSTAP messages */
static void
setup_and_run(struct config_strlist_head* local_list,
struct config_strlist_head* tcp_list,
struct config_strlist_head* tls_list, char* server_key,
char* server_cert, char* verifypem)
{
time_t secs = 0;
struct timeval now;
struct main_tap_data* maindata;
struct ub_event_base* base;
const char *evnm="event", *evsys="", *evmethod="";
maindata = calloc(1, sizeof(*maindata));
if(!maindata) fatal_exit("out of memory");
memset(&now, 0, sizeof(now));
base = ub_default_event_base(1, &secs, &now);
if(!base) fatal_exit("could not create ub_event base");
maindata->base = base;
sig_base = base;
if(sig_quit) {
ub_event_base_free(base);
free(maindata);
return;
}
ub_get_event_sys(base, &evnm, &evsys, &evmethod);
if(verbosity) log_info("%s %s uses %s method", evnm, evsys, evmethod);
setup_local_list(maindata, local_list);
setup_tcp_list(maindata, tcp_list);
setup_tls_list(maindata, tls_list, server_key, server_cert,
verifypem);
if(!tap_socket_list_addevs(maindata->acceptlist, base))
fatal_exit("could not setup accept events");
if(verbosity) log_info("start of service");
ub_event_base_dispatch(base);
sig_base = NULL;
if(verbosity) log_info("end of service");
tap_socket_list_delete(maindata->acceptlist);
ub_event_base_free(base);
free(maindata);
}
/** getopt global, in case header files fail to declare it. */
extern int optind;
/** getopt global, in case header files fail to declare it. */
extern char* optarg;
/** main program for streamtcp */
int main(int argc, char** argv)
{
int c;
int usessl = 0;
struct config_strlist_head local_list;
struct config_strlist_head tcp_list;
struct config_strlist_head tls_list;
char* server_key = NULL, *server_cert = NULL, *verifypem = NULL;
#ifdef USE_WINSOCK
WSADATA wsa_data;
if(WSAStartup(MAKEWORD(2,2), &wsa_data) != 0) {
printf("WSAStartup failed\n");
return 1;
}
#endif
if(signal(SIGINT, main_sigh) == SIG_ERR ||
#ifdef SIGQUIT
signal(SIGQUIT, main_sigh) == SIG_ERR ||
#endif
#ifdef SIGHUP
signal(SIGHUP, main_sigh) == SIG_ERR ||
#endif
#ifdef SIGBREAK
signal(SIGBREAK, main_sigh) == SIG_ERR ||
#endif
signal(SIGTERM, main_sigh) == SIG_ERR)
fatal_exit("could not bind to signal");
memset(&local_list, 0, sizeof(local_list));
memset(&tcp_list, 0, sizeof(tcp_list));
memset(&tls_list, 0, sizeof(tls_list));
/* lock debug start (if any) */
checklock_start();
log_ident_set("unbound-dnstap-socket");
log_init(0, 0, 0);
#ifdef SIGPIPE
if(signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
perror("could not install signal handler for SIGPIPE");
return 1;
}
#endif
/* command line options */
while( (c=getopt(argc, argv, "hls:t:u:vx:y:z:")) != -1) {
switch(c) {
case 'u':
if(!cfg_strlist_append(&local_list,
strdup(optarg)))
fatal_exit("out of memory");
break;
case 's':
if(!cfg_strlist_append(&tcp_list,
strdup(optarg)))
fatal_exit("out of memory");
break;
case 't':
if(!cfg_strlist_append(&tls_list,
strdup(optarg)))
fatal_exit("out of memory");
usessl = 1;
break;
case 'x':
server_key = optarg;
usessl = 1;
break;
case 'y':
server_cert = optarg;
usessl = 1;
break;
case 'z':
verifypem = optarg;
usessl = 1;
break;
case 'l':
longformat = 1;
break;
case 'v':
verbosity++;
break;
case 'h':
case '?':
default:
usage(argv);
}
}
argc -= optind;
argv += optind;
if(usessl) {
#ifdef HAVE_SSL
#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
ERR_load_SSL_strings();
#endif
#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
# ifndef S_SPLINT_S
OpenSSL_add_all_algorithms();
# endif
#else
OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
| OPENSSL_INIT_ADD_ALL_DIGESTS
| OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
#endif
#if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
(void)SSL_library_init();
#else
(void)OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
#endif
#endif /* HAVE_SSL */
}
setup_and_run(&local_list, &tcp_list, &tls_list, server_key,
server_cert, verifypem);
config_delstrlist(local_list.first);
config_delstrlist(tcp_list.first);
config_delstrlist(tls_list.first);
checklock_stop();
#ifdef USE_WINSOCK
WSACleanup();
#endif
return 0;
}
/***--- definitions to make fptr_wlist work. ---***/
/* These are callbacks, similar to smallapp callbacks, except the debug
* tool callbacks are not in it */
struct tube;
struct query_info;
#include "util/data/packed_rrset.h"
#include "daemon/worker.h"
#include "daemon/remote.h"
#include "util/fptr_wlist.h"
#include "libunbound/context.h"
void worker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
int worker_handle_request(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
int worker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(reply_info))
{
log_assert(0);
return 0;
}
int remote_accept_callback(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
int remote_control_callback(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(repinfo))
{
log_assert(0);
return 0;
}
void worker_sighandler(int ATTR_UNUSED(sig), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
struct outbound_entry* worker_send_query(
struct query_info* ATTR_UNUSED(qinfo), uint16_t ATTR_UNUSED(flags),
int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec),
int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr),
socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone),
size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream),
int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
struct module_qstate* ATTR_UNUSED(q))
{
log_assert(0);
return 0;
}
#ifdef UB_ON_WINDOWS
void
worker_win_stop_cb(int ATTR_UNUSED(fd), short ATTR_UNUSED(ev), void*
ATTR_UNUSED(arg)) {
log_assert(0);
}
void
wsvc_cron_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
#endif /* UB_ON_WINDOWS */
void
worker_alloc_cleanup(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
struct outbound_entry* libworker_send_query(
struct query_info* ATTR_UNUSED(qinfo), uint16_t ATTR_UNUSED(flags),
int ATTR_UNUSED(dnssec), int ATTR_UNUSED(want_dnssec),
int ATTR_UNUSED(nocaps), struct sockaddr_storage* ATTR_UNUSED(addr),
socklen_t ATTR_UNUSED(addrlen), uint8_t* ATTR_UNUSED(zone),
size_t ATTR_UNUSED(zonelen), int ATTR_UNUSED(tcp_upstream),
int ATTR_UNUSED(ssl_upstream), char* ATTR_UNUSED(tls_auth_name),
struct module_qstate* ATTR_UNUSED(q))
{
log_assert(0);
return 0;
}
int libworker_handle_service_reply(struct comm_point* ATTR_UNUSED(c),
void* ATTR_UNUSED(arg), int ATTR_UNUSED(error),
struct comm_reply* ATTR_UNUSED(reply_info))
{
log_assert(0);
return 0;
}
void libworker_handle_control_cmd(struct tube* ATTR_UNUSED(tube),
uint8_t* ATTR_UNUSED(buffer), size_t ATTR_UNUSED(len),
int ATTR_UNUSED(error), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void libworker_fg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
{
log_assert(0);
}
void libworker_bg_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
{
log_assert(0);
}
void libworker_event_done_cb(void* ATTR_UNUSED(arg), int ATTR_UNUSED(rcode),
struct sldns_buffer* ATTR_UNUSED(buf), enum sec_status ATTR_UNUSED(s),
char* ATTR_UNUSED(why_bogus), int ATTR_UNUSED(was_ratelimited))
{
log_assert(0);
}
int context_query_cmp(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
{
log_assert(0);
return 0;
}
void worker_stat_timer_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_probe_timer_cb(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_start_accept(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
void worker_stop_accept(void* ATTR_UNUSED(arg))
{
log_assert(0);
}
/** keep track of lock id in lock-verify application */
struct order_id {
/** the thread id that created it */
int thr;
/** the instance number of creation */
int instance;
};
int order_lock_cmp(const void* e1, const void* e2)
{
const struct order_id* o1 = e1;
const struct order_id* o2 = e2;
if(o1->thr < o2->thr) return -1;
if(o1->thr > o2->thr) return 1;
if(o1->instance < o2->instance) return -1;
if(o1->instance > o2->instance) return 1;
return 0;
}
int
codeline_cmp(const void* a, const void* b)
{
return strcmp(a, b);
}
int replay_var_compare(const void* ATTR_UNUSED(a), const void* ATTR_UNUSED(b))
{
log_assert(0);
return 0;
}
void remote_get_opt_ssl(char* ATTR_UNUSED(str), void* ATTR_UNUSED(arg))
{
log_assert(0);
}
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