unbound/dnstap/dnstap.c

   1 /* dnstap support for Unbound */
   2
   3 /*
   4  * Copyright (c) 2013-2014, Farsight Security, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  * notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  * notice, this list of conditions and the following disclaimer in the
  16  * documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of the copyright holder nor the names of its
  19  * contributors may be used to endorse or promote products derived from
  20  * this software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  25  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  26  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  27  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  29  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  31  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  32  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "dnstap/dnstap_config.h"
  36
  37 #ifdef USE_DNSTAP
  38
  39 #include "config.h"
  40 #include <string.h>
  41 #include <sys/time.h>
  42 #include "ldns/sbuffer.h"
  43 #include "util/config_file.h"
  44 #include "util/net_help.h"
  45 #include "util/netevent.h"
  46 #include "util/log.h"
  47
  48 #include <fstrm.h>
  49 #include <protobuf-c/protobuf-c.h>
  50
  51 #include "dnstap/dnstap.h"
  52 #include "dnstap/dnstap.pb-c.h"
  53
  54 #define DNSTAP_CONTENT_TYPE             "protobuf:dnstap.Dnstap"
  55 #define DNSTAP_INITIAL_BUF_SIZE         256
  56
  57 struct dt_msg {
  58         void            *buf;
  59         size_t          len_buf;
  60         Dnstap__Dnstap  d;
  61         Dnstap__Message m;
  62 };
  63
  64 static int
  65 dt_pack(const Dnstap__Dnstap *d, void **buf, size_t *sz)
  66 {
  67         ProtobufCBufferSimple sbuf;
  68
  69         memset(&sbuf, 0, sizeof(sbuf));
  70         sbuf.base.append = protobuf_c_buffer_simple_append;
  71         sbuf.len = 0;
  72         sbuf.alloced = DNSTAP_INITIAL_BUF_SIZE;
  73         sbuf.data = malloc(sbuf.alloced);
  74         if (sbuf.data == NULL)
  75                 return 0;
  76         sbuf.must_free_data = 1;
  77
  78         *sz = dnstap__dnstap__pack_to_buffer(d, (ProtobufCBuffer *) &sbuf);
  79         if (sbuf.data == NULL)
  80                 return 0;
  81         *buf = sbuf.data;
  82
  83         return 1;
  84 }
  85
  86 static void
  87 dt_send(const struct dt_env *env, void *buf, size_t len_buf)
  88 {
  89         fstrm_res res;
  90         if (!buf)
  91                 return;
  92         res = fstrm_iothr_submit(env->iothr, env->ioq, buf, len_buf,
  93                                  fstrm_free_wrapper, NULL);
  94         if (res != fstrm_res_success)
  95                 free(buf);
  96 }
  97
  98 static void
  99 dt_msg_init(const struct dt_env *env,
 100             struct dt_msg *dm,
 101             Dnstap__Message__Type mtype)
 102 {
 103         memset(dm, 0, sizeof(*dm));
 104         dm->d.base.descriptor = &dnstap__dnstap__descriptor;
 105         dm->m.base.descriptor = &dnstap__message__descriptor;
 106         dm->d.type = DNSTAP__DNSTAP__TYPE__MESSAGE;
 107         dm->d.message = &dm->m;
 108         dm->m.type = mtype;
 109         if (env->identity != NULL) {
 110                 dm->d.identity.data = (uint8_t *) env->identity;
 111                 dm->d.identity.len = (size_t) env->len_identity;
 112                 dm->d.has_identity = 1;
 113         }
 114         if (env->version != NULL) {
 115                 dm->d.version.data = (uint8_t *) env->version;
 116                 dm->d.version.len = (size_t) env->len_version;
 117                 dm->d.has_version = 1;
 118         }
 119 }
 120
 121 struct dt_env *
 122 dt_create(const char *socket_path, unsigned num_workers)
 123 {
 124         fstrm_res res;
 125         struct dt_env *env;
 126         struct fstrm_iothr_options *fopt;
 127         struct fstrm_unix_writer_options *fuwopt;
 128         struct fstrm_writer *fw;
 129         struct fstrm_writer_options *fwopt;
 130
 131         verbose(VERB_OPS, "opening dnstap socket %s", socket_path);
 132         log_assert(socket_path != NULL);
 133         log_assert(num_workers > 0);
 134
 135         env = (struct dt_env *) calloc(1, sizeof(struct dt_env));
 136         if (!env)
 137                 return NULL;
 138
 139         fwopt = fstrm_writer_options_init();
 140         res = fstrm_writer_options_add_content_type(fwopt,
 141                 DNSTAP_CONTENT_TYPE, sizeof(DNSTAP_CONTENT_TYPE) - 1);
 142         log_assert(res == fstrm_res_success);
 143
 144         fuwopt = fstrm_unix_writer_options_init();
 145         fstrm_unix_writer_options_set_socket_path(fuwopt, socket_path);
 146
 147         fw = fstrm_unix_writer_init(fuwopt, fwopt);
 148         log_assert(fw != NULL);
 149
 150         fopt = fstrm_iothr_options_init();
 151         fstrm_iothr_options_set_num_input_queues(fopt, num_workers);
 152         env->iothr = fstrm_iothr_init(fopt, &fw);
 153         if (env->iothr == NULL) {
 154                 verbose(VERB_DETAIL, "dt_create: fstrm_iothr_init() failed");
 155                 fstrm_writer_destroy(&fw);
 156                 free(env);
 157                 env = NULL;
 158         }
 159         fstrm_iothr_options_destroy(&fopt);
 160         fstrm_unix_writer_options_destroy(&fuwopt);
 161         fstrm_writer_options_destroy(&fwopt);
 162
 163         return env;
 164 }
 165
 166 static void
 167 dt_apply_identity(struct dt_env *env, struct config_file *cfg)
 168 {
 169         char buf[MAXHOSTNAMELEN+1];
 170         if (!cfg->dnstap_send_identity)
 171                 return;
 172         free(env->identity);
 173         if (cfg->dnstap_identity == NULL || cfg->dnstap_identity[0] == 0) {
 174                 if (gethostname(buf, MAXHOSTNAMELEN) == 0) {
 175                         buf[MAXHOSTNAMELEN] = 0;
 176                         env->identity = strdup(buf);
 177                 } else {
 178                         fatal_exit("dt_apply_identity: gethostname() failed");
 179                 }
 180         } else {
 181                 env->identity = strdup(cfg->dnstap_identity);
 182         }
 183         if (env->identity == NULL)
 184                 fatal_exit("dt_apply_identity: strdup() failed");
 185         env->len_identity = (unsigned int)strlen(env->identity);
 186         verbose(VERB_OPS, "dnstap identity field set to \"%s\"",
 187                 env->identity);
 188 }
 189
 190 static void
 191 dt_apply_version(struct dt_env *env, struct config_file *cfg)
 192 {
 193         if (!cfg->dnstap_send_version)
 194                 return;
 195         free(env->version);
 196         if (cfg->dnstap_version == NULL || cfg->dnstap_version[0] == 0)
 197                 env->version = strdup(PACKAGE_STRING);
 198         else
 199                 env->version = strdup(cfg->dnstap_version);
 200         if (env->version == NULL)
 201                 fatal_exit("dt_apply_version: strdup() failed");
 202         env->len_version = (unsigned int)strlen(env->version);
 203         verbose(VERB_OPS, "dnstap version field set to \"%s\"",
 204                 env->version);
 205 }
 206
 207 void
 208 dt_apply_cfg(struct dt_env *env, struct config_file *cfg)
 209 {
 210         if (!cfg->dnstap)
 211                 return;
 212
 213         dt_apply_identity(env, cfg);
 214         dt_apply_version(env, cfg);
 215         if ((env->log_resolver_query_messages = (unsigned int)
 216              cfg->dnstap_log_resolver_query_messages))
 217         {
 218                 verbose(VERB_OPS, "dnstap Message/RESOLVER_QUERY enabled");
 219         }
 220         if ((env->log_resolver_response_messages = (unsigned int)
 221              cfg->dnstap_log_resolver_response_messages))
 222         {
 223                 verbose(VERB_OPS, "dnstap Message/RESOLVER_RESPONSE enabled");
 224         }
 225         if ((env->log_client_query_messages = (unsigned int)
 226              cfg->dnstap_log_client_query_messages))
 227         {
 228                 verbose(VERB_OPS, "dnstap Message/CLIENT_QUERY enabled");
 229         }
 230         if ((env->log_client_response_messages = (unsigned int)
 231              cfg->dnstap_log_client_response_messages))
 232         {
 233                 verbose(VERB_OPS, "dnstap Message/CLIENT_RESPONSE enabled");
 234         }
 235         if ((env->log_forwarder_query_messages = (unsigned int)
 236              cfg->dnstap_log_forwarder_query_messages))
 237         {
 238                 verbose(VERB_OPS, "dnstap Message/FORWARDER_QUERY enabled");
 239         }
 240         if ((env->log_forwarder_response_messages = (unsigned int)
 241              cfg->dnstap_log_forwarder_response_messages))
 242         {
 243                 verbose(VERB_OPS, "dnstap Message/FORWARDER_RESPONSE enabled");
 244         }
 245 }
 246
 247 int
 248 dt_init(struct dt_env *env)
 249 {
 250         env->ioq = fstrm_iothr_get_input_queue(env->iothr);
 251         if (env->ioq == NULL)
 252                 return 0;
 253         return 1;
 254 }
 255
 256 void
 257 dt_delete(struct dt_env *env)
 258 {
 259         if (!env)
 260                 return;
 261         verbose(VERB_OPS, "closing dnstap socket");
 262         fstrm_iothr_destroy(&env->iothr);
 263         free(env->identity);
 264         free(env->version);
 265         free(env);
 266 }
 267
 268 static void
 269 dt_fill_timeval(const struct timeval *tv,
 270                 uint64_t *time_sec, protobuf_c_boolean *has_time_sec,
 271                 uint32_t *time_nsec, protobuf_c_boolean *has_time_nsec)
 272 {
 273 #ifndef S_SPLINT_S
 274         *time_sec = tv->tv_sec;
 275         *time_nsec = tv->tv_usec * 1000;
 276 #endif
 277         *has_time_sec = 1;
 278         *has_time_nsec = 1;
 279 }
 280
 281 static void
 282 dt_fill_buffer(sldns_buffer *b, ProtobufCBinaryData *p, protobuf_c_boolean *has)
 283 {
 284         log_assert(b != NULL);
 285         p->len = sldns_buffer_limit(b);
 286         p->data = sldns_buffer_begin(b);
 287         *has = 1;
 288 }
 289
 290 static void
 291 dt_msg_fill_net(struct dt_msg *dm,
 292                 struct sockaddr_storage *ss,
 293                 enum comm_point_type cptype,
 294                 ProtobufCBinaryData *addr, protobuf_c_boolean *has_addr,
 295                 uint32_t *port, protobuf_c_boolean *has_port)
 296 {
 297         log_assert(ss->ss_family == AF_INET6 || ss->ss_family == AF_INET);
 298         if (ss->ss_family == AF_INET6) {
 299                 struct sockaddr_in6 *s = (struct sockaddr_in6 *) ss;
 300
 301                 /* socket_family */
 302                 dm->m.socket_family = DNSTAP__SOCKET_FAMILY__INET6;
 303                 dm->m.has_socket_family = 1;
 304
 305                 /* addr: query_address or response_address */
 306                 addr->data = s->sin6_addr.s6_addr;
 307                 addr->len = 16; /* IPv6 */
 308                 *has_addr = 1;
 309
 310                 /* port: query_port or response_port */
 311                 *port = ntohs(s->sin6_port);
 312                 *has_port = 1;
 313         } else if (ss->ss_family == AF_INET) {
 314                 struct sockaddr_in *s = (struct sockaddr_in *) ss;
 315
 316                 /* socket_family */
 317                 dm->m.socket_family = DNSTAP__SOCKET_FAMILY__INET;
 318                 dm->m.has_socket_family = 1;
 319
 320                 /* addr: query_address or response_address */
 321                 addr->data = (uint8_t *) &s->sin_addr.s_addr;
 322                 addr->len = 4; /* IPv4 */
 323                 *has_addr = 1;
 324
 325                 /* port: query_port or response_port */
 326                 *port = ntohs(s->sin_port);
 327                 *has_port = 1;
 328         }
 329
 330         log_assert(cptype == comm_udp || cptype == comm_tcp);
 331         if (cptype == comm_udp) {
 332                 /* socket_protocol */
 333                 dm->m.socket_protocol = DNSTAP__SOCKET_PROTOCOL__UDP;
 334                 dm->m.has_socket_protocol = 1;
 335         } else if (cptype == comm_tcp) {
 336                 /* socket_protocol */
 337                 dm->m.socket_protocol = DNSTAP__SOCKET_PROTOCOL__TCP;
 338                 dm->m.has_socket_protocol = 1;
 339         }
 340 }
 341
 342 void
 343 dt_msg_send_client_query(struct dt_env *env,
 344                          struct sockaddr_storage *qsock,
 345                          enum comm_point_type cptype,
 346                          sldns_buffer *qmsg)
 347 {
 348         struct dt_msg dm;
 349         struct timeval qtime;
 350
 351         gettimeofday(&qtime, NULL);
 352
 353         /* type */
 354         dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__CLIENT_QUERY);
 355
 356         /* query_time */
 357         dt_fill_timeval(&qtime,
 358                         &dm.m.query_time_sec, &dm.m.has_query_time_sec,
 359                         &dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
 360
 361         /* query_message */
 362         dt_fill_buffer(qmsg, &dm.m.query_message, &dm.m.has_query_message);
 363
 364         /* socket_family, socket_protocol, query_address, query_port */
 365         log_assert(cptype == comm_udp || cptype == comm_tcp);
 366         dt_msg_fill_net(&dm, qsock, cptype,
 367                         &dm.m.query_address, &dm.m.has_query_address,
 368                         &dm.m.query_port, &dm.m.has_query_port);
 369
 370         if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
 371                 dt_send(env, dm.buf, dm.len_buf);
 372 }
 373
 374 void
 375 dt_msg_send_client_response(struct dt_env *env,
 376                             struct sockaddr_storage *qsock,
 377                             enum comm_point_type cptype,
 378                             sldns_buffer *rmsg)
 379 {
 380         struct dt_msg dm;
 381         struct timeval rtime;
 382
 383         gettimeofday(&rtime, NULL);
 384
 385         /* type */
 386         dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__CLIENT_RESPONSE);
 387
 388         /* response_time */
 389         dt_fill_timeval(&rtime,
 390                         &dm.m.response_time_sec, &dm.m.has_response_time_sec,
 391                         &dm.m.response_time_nsec, &dm.m.has_response_time_nsec);
 392
 393         /* response_message */
 394         dt_fill_buffer(rmsg, &dm.m.response_message, &dm.m.has_response_message);
 395
 396         /* socket_family, socket_protocol, query_address, query_port */
 397         log_assert(cptype == comm_udp || cptype == comm_tcp);
 398         dt_msg_fill_net(&dm, qsock, cptype,
 399                         &dm.m.query_address, &dm.m.has_query_address,
 400                         &dm.m.query_port, &dm.m.has_query_port);
 401
 402         if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
 403                 dt_send(env, dm.buf, dm.len_buf);
 404 }
 405
 406 void
 407 dt_msg_send_outside_query(struct dt_env *env,
 408                           struct sockaddr_storage *rsock,
 409                           enum comm_point_type cptype,
 410                           uint8_t *zone, size_t zone_len,
 411                           sldns_buffer *qmsg)
 412 {
 413         struct dt_msg dm;
 414         struct timeval qtime;
 415         uint16_t qflags;
 416
 417         gettimeofday(&qtime, NULL);
 418         qflags = sldns_buffer_read_u16_at(qmsg, 2);
 419
 420         /* type */
 421         if (qflags & BIT_RD) {
 422                 if (!env->log_forwarder_query_messages)
 423                         return;
 424                 dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__FORWARDER_QUERY);
 425         } else {
 426                 if (!env->log_resolver_query_messages)
 427                         return;
 428                 dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__RESOLVER_QUERY);
 429         }
 430
 431         /* query_zone */
 432         dm.m.query_zone.data = zone;
 433         dm.m.query_zone.len = zone_len;
 434         dm.m.has_query_zone = 1;
 435
 436         /* query_time_sec, query_time_nsec */
 437         dt_fill_timeval(&qtime,
 438                         &dm.m.query_time_sec, &dm.m.has_query_time_sec,
 439                         &dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
 440
 441         /* query_message */
 442         dt_fill_buffer(qmsg, &dm.m.query_message, &dm.m.has_query_message);
 443
 444         /* socket_family, socket_protocol, response_address, response_port */
 445         log_assert(cptype == comm_udp || cptype == comm_tcp);
 446         dt_msg_fill_net(&dm, rsock, cptype,
 447                         &dm.m.response_address, &dm.m.has_response_address,
 448                         &dm.m.response_port, &dm.m.has_response_port);
 449
 450         if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
 451                 dt_send(env, dm.buf, dm.len_buf);
 452 }
 453
 454 void
 455 dt_msg_send_outside_response(struct dt_env *env,
 456                              struct sockaddr_storage *rsock,
 457                              enum comm_point_type cptype,
 458                              uint8_t *zone, size_t zone_len,
 459                              uint8_t *qbuf, size_t qbuf_len,
 460                              const struct timeval *qtime,
 461                              const struct timeval *rtime,
 462                              sldns_buffer *rmsg)
 463 {
 464         struct dt_msg dm;
 465         uint16_t qflags;
 466
 467         log_assert(qbuf_len >= sizeof(qflags));
 468         memcpy(&qflags, qbuf, sizeof(qflags));
 469         qflags = ntohs(qflags);
 470
 471         /* type */
 472         if (qflags & BIT_RD) {
 473                 if (!env->log_forwarder_response_messages)
 474                         return;
 475                 dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__FORWARDER_RESPONSE);
 476         } else {
 477                 if (!env->log_resolver_query_messages)
 478                         return;
 479                 dt_msg_init(env, &dm, DNSTAP__MESSAGE__TYPE__RESOLVER_RESPONSE);
 480         }
 481
 482         /* query_zone */
 483         dm.m.query_zone.data = zone;
 484         dm.m.query_zone.len = zone_len;
 485         dm.m.has_query_zone = 1;
 486
 487         /* query_time_sec, query_time_nsec */
 488         dt_fill_timeval(qtime,
 489                         &dm.m.query_time_sec, &dm.m.has_query_time_sec,
 490                         &dm.m.query_time_nsec, &dm.m.has_query_time_nsec);
 491
 492         /* response_time_sec, response_time_nsec */
 493         dt_fill_timeval(rtime,
 494                         &dm.m.response_time_sec, &dm.m.has_response_time_sec,
 495                         &dm.m.response_time_nsec, &dm.m.has_response_time_nsec);
 496
 497         /* response_message */
 498         dt_fill_buffer(rmsg, &dm.m.response_message, &dm.m.has_response_message);
 499
 500         /* socket_family, socket_protocol, response_address, response_port */
 501         log_assert(cptype == comm_udp || cptype == comm_tcp);
 502         dt_msg_fill_net(&dm, rsock, cptype,
 503                         &dm.m.response_address, &dm.m.has_response_address,
 504                         &dm.m.response_port, &dm.m.has_response_port);
 505
 506         if (dt_pack(&dm.d, &dm.buf, &dm.len_buf))
 507                 dt_send(env, dm.buf, dm.len_buf);
 508 }
 509
 510 #endif /* USE_DNSTAP */