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wownero/external/unbound/dnstap/dnstap.c

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/* dnstap support for Unbound */
/*
* Copyright (c) 2013-2014, Farsight Security, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder 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.
*/
#include "dnstap/dnstap_config.h"
#ifdef USE_DNSTAP
#include "config.h"
#include <string.h>
#include <sys/time.h>
#include "sldns/sbuffer.h"
#include "util/config_file.h"
#include "util/net_help.h"
#include "util/netevent.h"
#include "util/log.h"
#include <fstrm.h>
#include <protobuf-c/protobuf-c.h>
#include "dnstap/dnstap.h"
#include "dnstap/dnstap.pb-c.h"
#define DNSTAP_CONTENT_TYPE "protobuf:dnstap.Dnstap"
#define DNSTAP_INITIAL_BUF_SIZE 256
struct dt_msg {
void *buf;
size_t len_buf;
Dnstap__Dnstap d;
Dnstap__Message m;
};
static int
dt_pack(const Dnstap__Dnstap *d, void **buf, size_t *sz)
{
ProtobufCBufferSimple sbuf;
memset(&sbuf, 0, sizeof(sbuf));
sbuf.base.append = protobuf_c_buffer_simple_append;
sbuf.len = 0;
sbuf.alloced = DNSTAP_INITIAL_BUF_SIZE;
sbuf.data = malloc(sbuf.alloced);
if (sbuf.data == NULL)
return 0;
sbuf.must_free_data = 1;
*sz = dnstap__dnstap__pack_to_buffer(d, (ProtobufCBuffer *) &sbuf);
if (sbuf.data == NULL)
return 0;
*buf = sbuf.data;
return 1;
}
static void
dt_send(const struct dt_env *env, void *buf, size_t len_buf)
{
fstrm_res res;
if (!buf)
return;
res = fstrm_iothr_submit(env->iothr, env->ioq, buf, len_buf,
fstrm_free_wrapper, NULL);
if (res != fstrm_res_success)
free(buf);
}
static void
dt_msg_init(const struct dt_env *env,
struct dt_msg *dm,
Dnstap__Message__Type mtype)
{
memset(dm, 0, sizeof(*dm));
dm->d.base.descriptor = &dnstap__dnstap__descriptor;
dm->m.base.descriptor = &dnstap__message__descriptor;
dm->d.type = DNSTAP__DNSTAP__TYPE__MESSAGE;
dm->d.message = &dm->m;
dm->m.type = mtype;
if (env->identity != NULL) {
dm->d.identity.data = (uint8_t *) env->identity;
dm->d.identity.len = (size_t) env->len_identity;
dm->d.has_identity = 1;
}
if (env->version != NULL) {
dm->d.version.data = (uint8_t *) env->version;
dm->d.version.len = (size_t) env->len_version;
dm->d.has_version = 1;
}
}
struct dt_env *
dt_create(const char *socket_path, unsigned num_workers)
{
#ifdef UNBOUND_DEBUG
fstrm_res res;
#endif
struct dt_env *env;
struct fstrm_iothr_options *fopt;
struct fstrm_unix_writer_options *fuwopt;
struct fstrm_writer *fw;
struct fstrm_writer_options *fwopt;
verbose(VERB_OPS, "attempting to connect to dnstap socket %s",
socket_path);
log_assert(socket_path != NULL);
log_assert(num_workers > 0);
env = (struct dt_env *) calloc(1, sizeof(struct dt_env));
if (!env)
return NULL;
fwopt = fstrm_writer_options_init();
#ifdef UNBOUND_DEBUG
res =
#else
(void)
#endif
fstrm_writer_options_add_content_type(fwopt,
DNSTAP_CONTENT_TYPE, sizeof(DNSTAP_CONTENT_TYPE) - 1);
log_assert(res == fstrm_res_success);
fuwopt = fstrm_unix_writer_options_init();
fstrm_unix_writer_options_set_socket_path(fuwopt, socket_path);
fw = fstrm_unix_writer_init(fuwopt, fwopt);
log_assert(fw != NULL);
fopt = fstrm_iothr_options_init();
fstrm_iothr_options_set_num_input_queues(fopt, num_workers);
env->iothr = fstrm_iothr_init(fopt, &fw);
if (env->iothr == NULL) {
verbose(VERB_DETAIL, "dt_create: fstrm_iothr_init() failed");
fstrm_writer_destroy(&fw);
free(env);
env = NULL;
}
fstrm_iothr_options_destroy(&fopt);
fstrm_unix_writer_options_destroy(&fuwopt);
fstrm_writer_options_destroy(&fwopt);
return env;
}
static void
dt_apply_identity(struct dt_env *env, struct config_file *cfg)
{
char buf[MAXHOSTNAMELEN+1];
if (!cfg->dnstap_send_identity)
return;
free(env->identity);
if (cfg->dnstap_identity == NULL || cfg->dnstap_identity[0] == 0) {
if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
buf[MAXHOSTNAMELEN] = 0;
env->identity = strdup(buf);
} else {
fatal_exit("dt_apply_identity: gethostname() failed");
}
} else {
env->identity = strdup(cfg->dnstap_identity);
}
if (env->identity == NULL)
fatal_exit("dt_apply_identity: strdup() failed");
env->len_identity = (unsigned int)strlen(env->identity);
verbose(VERB_OPS, "dnstap identity field set to \"%s\"",
env->identity);
}
static void
dt_apply_version(struct dt_env *env, struct config_file *cfg)
{
if (!cfg->dnstap_send_version)
return;
free(env->version);
if (cfg->dnstap_version == NULL || cfg->dnstap_version[0] == 0)
env->version = strdup(PACKAGE_STRING);
else
env->version = strdup(cfg->dnstap_version);
if (env->version == NULL)
fatal_exit("dt_apply_version: strdup() failed");
env->len_version = (unsigned int)strlen(env->version);
verbose(VERB_OPS, "dnstap version field set to \"%s\"",
env->version);
}
void
dt_apply_cfg(struct dt_env *env, struct config_file *cfg)
{
if (!cfg->dnstap)
return;
dt_apply_identity(env, cfg);
dt_apply_version(env, cfg);
if ((env->log_resolver_query_messages = (unsigned int)
cfg->dnstap_log_resolver_query_messages))
{
verbose(VERB_OPS, "dnstap Message/RESOLVER_QUERY enabled");
}
if ((env->log_resolver_response_messages = (unsigned int)
cfg->dnstap_log_resolver_response_messages))
{
verbose(VERB_OPS, "dnstap Message/RESOLVER_RESPONSE enabled");
}
if ((env->log_client_query_messages = (unsigned int)
cfg->dnstap_log_client_query_messages))
{
verbose(VERB_OPS, "dnstap Message/CLIENT_QUERY enabled");
}
if ((env->log_client_response_messages = (unsigned int)
cfg->dnstap_log_client_response_messages))
{
verbose(VERB_OPS, "dnstap Message/CLIENT_RESPONSE enabled");
}
if ((env->log_forwarder_query_messages = (unsigned int)
cfg->dnstap_log_forwarder_query_messages))
{
verbose(VERB_OPS, "dnstap Message/FORWARDER_QUERY enabled");
}
if ((env->log_forwarder_response_messages = (unsigned int)
cfg->dnstap_log_forwarder_response_messages))
{
verbose(VERB_OPS, "dnstap Message/FORWARDER_RESPONSE enabled");
}
}
int
dt_init(struct dt_env *env)
{
env->ioq = fstrm_iothr_get_input_queue(env->iothr);
if (env->ioq == NULL)
return 0;
return 1;
}
void
dt_delete(struct dt_env *env)
{
if (!env)
return;
verbose(VERB_OPS, "closing dnstap socket");
fstrm_iothr_destroy(&env->iothr);
free(env->identity);
free(env->version);
free(env);
}
static void
dt_fill_timeval(const struct timeval *tv,
uint64_t *time_sec, protobuf_c_boolean *has_time_sec,
uint32_t *time_nsec, protobuf_c_boolean *has_time_nsec)
{
#ifndef S_SPLINT_S
*time_sec = tv->tv_sec;
*time_nsec = tv->tv_usec * 1000;
#endif
*has_time_sec = 1;
*has_time_nsec = 1;
}
static void
dt_fill_buffer(sldns_buffer *b, ProtobufCBinaryData *p, protobuf_c_boolean *has)
{
log_assert(b != NULL);
p->len = sldns_buffer_limit(b);
p->data = sldns_buffer_begin(b);
*has = 1;
}
static void
dt_msg_fill_net(struct dt_msg *dm,
struct sockaddr_storage *ss,
enum comm_point_type cptype,
ProtobufCBinaryData *addr, protobuf_c_boolean *has_addr,
uint32_t *port, protobuf_c_boolean *has_port)
{
log_assert(ss->ss_family == AF_INET6 || ss->ss_family == AF_INET);
if (ss->ss_family == AF_INET6) {
struct sockaddr_in6 *s = (struct sockaddr_in6 *) ss;
/* socket_family */
dm->m.socket_family = DNSTAP__SOCKET_FAMILY__INET6;
dm->m.has_socket_family = 1;
/* addr: query_address or response_address */
addr->data = s->sin6_addr.s6_addr;
addr->len = 16; /* IPv6 */
*has_addr = 1;
/* port: query_port or response_port */
*port = ntohs(s->sin6_port);
*has_port = 1;
} else if (ss->ss_family == AF_INET) {
struct sockaddr_in *s = (struct sockaddr_in *) ss;
/* socket_family */
dm->m.socket_family = DNSTAP__SOCKET_FAMILY__INET;
dm->m.has_socket_family = 1;
/* addr: query_address or response_address */
addr->data = (uint8_t *) &s->sin_addr.s_addr;
addr->len = 4; /* IPv4 */
*has_addr = 1;
/* port: query_port or response_port */
*port = ntohs(s->sin_port);
*has_port = 1;
}
log_assert(cptype == comm_udp || cptype == comm_tcp);
if (cptype == comm_udp) {
/* socket_protocol */
dm->m.socket_protocol = DNSTAP__SOCKET_PROTOCOL__UDP;
dm->m.has_socket_protocol = 1;
} else if (cptype == comm_tcp) {
/* socket_protocol */
dm->m.socket_protocol = DNSTAP__SOCKET_PROTOCOL__TCP;
dm->m.has_socket_protocol = 1;
}
}
void
dt_msg_send_client_query(struct dt_env *env,
struct sockaddr_storage *qsock,
enum comm_point_type cptype,
sldns_buffer *qmsg)
{
struct dt_msg dm;
struct timeval qtime;
gettimeofday(&qtime, NULL);
/* type */
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__CLIENT_QUERY);
/* query_time */
dt_fill_timeval(&qtime,
&dm.m.query_time_sec, &dm.m.has_query_time_sec,
&dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
/* query_message */
dt_fill_buffer(qmsg, &dm.m.query_message, &dm.m.has_query_message);
/* socket_family, socket_protocol, query_address, query_port */
log_assert(cptype == comm_udp || cptype == comm_tcp);
dt_msg_fill_net(&dm, qsock, cptype,
&dm.m.query_address, &dm.m.has_query_address,
&dm.m.query_port, &dm.m.has_query_port);
if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
dt_send(env, dm.buf, dm.len_buf);
}
void
dt_msg_send_client_response(struct dt_env *env,
struct sockaddr_storage *qsock,
enum comm_point_type cptype,
sldns_buffer *rmsg)
{
struct dt_msg dm;
struct timeval rtime;
gettimeofday(&rtime, NULL);
/* type */
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__CLIENT_RESPONSE);
/* response_time */
dt_fill_timeval(&rtime,
&dm.m.response_time_sec, &dm.m.has_response_time_sec,
&dm.m.response_time_nsec, &dm.m.has_response_time_nsec);
/* response_message */
dt_fill_buffer(rmsg, &dm.m.response_message, &dm.m.has_response_message);
/* socket_family, socket_protocol, query_address, query_port */
log_assert(cptype == comm_udp || cptype == comm_tcp);
dt_msg_fill_net(&dm, qsock, cptype,
&dm.m.query_address, &dm.m.has_query_address,
&dm.m.query_port, &dm.m.has_query_port);
if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
dt_send(env, dm.buf, dm.len_buf);
}
void
dt_msg_send_outside_query(struct dt_env *env,
struct sockaddr_storage *rsock,
enum comm_point_type cptype,
uint8_t *zone, size_t zone_len,
sldns_buffer *qmsg)
{
struct dt_msg dm;
struct timeval qtime;
uint16_t qflags;
gettimeofday(&qtime, NULL);
qflags = sldns_buffer_read_u16_at(qmsg, 2);
/* type */
if (qflags & BIT_RD) {
if (!env->log_forwarder_query_messages)
return;
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__FORWARDER_QUERY);
} else {
if (!env->log_resolver_query_messages)
return;
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__RESOLVER_QUERY);
}
/* query_zone */
dm.m.query_zone.data = zone;
dm.m.query_zone.len = zone_len;
dm.m.has_query_zone = 1;
/* query_time_sec, query_time_nsec */
dt_fill_timeval(&qtime,
&dm.m.query_time_sec, &dm.m.has_query_time_sec,
&dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
/* query_message */
dt_fill_buffer(qmsg, &dm.m.query_message, &dm.m.has_query_message);
/* socket_family, socket_protocol, response_address, response_port */
log_assert(cptype == comm_udp || cptype == comm_tcp);
dt_msg_fill_net(&dm, rsock, cptype,
&dm.m.response_address, &dm.m.has_response_address,
&dm.m.response_port, &dm.m.has_response_port);
if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
dt_send(env, dm.buf, dm.len_buf);
}
void
dt_msg_send_outside_response(struct dt_env *env,
struct sockaddr_storage *rsock,
enum comm_point_type cptype,
uint8_t *zone, size_t zone_len,
uint8_t *qbuf, size_t qbuf_len,
const struct timeval *qtime,
const struct timeval *rtime,
sldns_buffer *rmsg)
{
struct dt_msg dm;
uint16_t qflags;
log_assert(qbuf_len >= sizeof(qflags));
memcpy(&qflags, qbuf, sizeof(qflags));
qflags = ntohs(qflags);
/* type */
if (qflags & BIT_RD) {
if (!env->log_forwarder_response_messages)
return;
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__FORWARDER_RESPONSE);
} else {
if (!env->log_resolver_response_messages)
return;
dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__RESOLVER_RESPONSE);
}
/* query_zone */
dm.m.query_zone.data = zone;
dm.m.query_zone.len = zone_len;
dm.m.has_query_zone = 1;
/* query_time_sec, query_time_nsec */
dt_fill_timeval(qtime,
&dm.m.query_time_sec, &dm.m.has_query_time_sec,
&dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
/* response_time_sec, response_time_nsec */
dt_fill_timeval(rtime,
&dm.m.response_time_sec, &dm.m.has_response_time_sec,
&dm.m.response_time_nsec, &dm.m.has_response_time_nsec);
/* response_message */
dt_fill_buffer(rmsg, &dm.m.response_message, &dm.m.has_response_message);
/* socket_family, socket_protocol, response_address, response_port */
log_assert(cptype == comm_udp || cptype == comm_tcp);
dt_msg_fill_net(&dm, rsock, cptype,
&dm.m.response_address, &dm.m.has_response_address,
&dm.m.response_port, &dm.m.has_response_port);
if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
dt_send(env, dm.buf, dm.len_buf);
}
#endif /* USE_DNSTAP */
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