Gilad Arnold | 968bf19 | 2015-07-17 00:23:30 -0700 | [diff] [blame] | 1 | |
| 2 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
| 3 | * Copyright (C) 2007-2011 by Daniel Stenberg |
| 4 | * |
| 5 | * Permission to use, copy, modify, and distribute this |
| 6 | * software and its documentation for any purpose and without |
| 7 | * fee is hereby granted, provided that the above copyright |
| 8 | * notice appear in all copies and that both that copyright |
| 9 | * notice and this permission notice appear in supporting |
| 10 | * documentation, and that the name of M.I.T. not be used in |
| 11 | * advertising or publicity pertaining to distribution of the |
| 12 | * software without specific, written prior permission. |
| 13 | * M.I.T. makes no representations about the suitability of |
| 14 | * this software for any purpose. It is provided "as is" |
| 15 | * without express or implied warranty. |
| 16 | */ |
| 17 | |
| 18 | #include "ares_setup.h" |
| 19 | |
| 20 | #ifdef HAVE_SYS_PARAM_H |
| 21 | #include <sys/param.h> |
| 22 | #endif |
| 23 | |
| 24 | #ifdef HAVE_SYS_TIME_H |
| 25 | #include <sys/time.h> |
| 26 | #endif |
| 27 | |
| 28 | #ifdef HAVE_SYS_SOCKET_H |
| 29 | #include <sys/socket.h> |
| 30 | #endif |
| 31 | |
| 32 | #ifdef HAVE_NETINET_IN_H |
| 33 | #include <netinet/in.h> |
| 34 | #endif |
| 35 | |
| 36 | #ifdef HAVE_NETDB_H |
| 37 | #include <netdb.h> |
| 38 | #endif |
| 39 | |
| 40 | #ifdef HAVE_ARPA_INET_H |
| 41 | #include <arpa/inet.h> |
| 42 | #endif |
| 43 | |
| 44 | #ifdef HAVE_ARPA_NAMESER_H |
| 45 | # include <arpa/nameser.h> |
| 46 | #else |
| 47 | # include "nameser.h" |
| 48 | #endif |
| 49 | #ifdef HAVE_ARPA_NAMESER_COMPAT_H |
| 50 | # include <arpa/nameser_compat.h> |
| 51 | #endif |
| 52 | |
| 53 | #ifdef HAVE_UNISTD_H |
| 54 | #include <unistd.h> |
| 55 | #endif |
| 56 | |
| 57 | #include <stdio.h> |
| 58 | #include <stdlib.h> |
| 59 | #include <string.h> |
| 60 | #include <ctype.h> |
| 61 | #include <time.h> |
| 62 | |
| 63 | #ifdef ANDROID |
| 64 | #include <sys/system_properties.h> |
| 65 | #endif |
| 66 | |
| 67 | #include "ares.h" |
| 68 | #include "inet_net_pton.h" |
| 69 | #include "ares_library_init.h" |
| 70 | #include "ares_nowarn.h" |
| 71 | #include "ares_platform.h" |
| 72 | #include "inet_ntop.h" |
| 73 | #include "ares_private.h" |
| 74 | |
| 75 | #ifdef WATT32 |
| 76 | #undef WIN32 /* Redefined in MingW/MSVC headers */ |
| 77 | #endif |
| 78 | |
| 79 | static int init_by_options(ares_channel channel, const struct ares_options *options, |
| 80 | int optmask); |
| 81 | static int init_by_environment(ares_channel channel); |
| 82 | static int init_by_resolv_conf(ares_channel channel); |
| 83 | static int init_by_defaults(ares_channel channel); |
| 84 | |
| 85 | #ifndef WATT32 |
| 86 | static int config_nameserver(struct server_state **servers, int *nservers, |
| 87 | char *str); |
| 88 | #endif |
| 89 | static int set_search(ares_channel channel, const char *str); |
| 90 | static int set_options(ares_channel channel, const char *str); |
| 91 | static const char *try_option(const char *p, const char *q, const char *opt); |
| 92 | static int init_id_key(rc4_key* key,int key_data_len); |
| 93 | |
| 94 | #if !defined(WIN32) && !defined(WATT32) |
| 95 | static int sortlist_alloc(struct apattern **sortlist, int *nsort, struct apattern *pat); |
| 96 | static int ip_addr(const char *s, ssize_t len, struct in_addr *addr); |
| 97 | static void natural_mask(struct apattern *pat); |
| 98 | static int config_domain(ares_channel channel, char *str); |
| 99 | static int config_lookup(ares_channel channel, const char *str, |
| 100 | const char *bindch, const char *filech); |
| 101 | static int config_sortlist(struct apattern **sortlist, int *nsort, |
| 102 | const char *str); |
| 103 | static char *try_config(char *s, const char *opt, char scc); |
| 104 | #endif |
| 105 | |
| 106 | #define ARES_CONFIG_CHECK(x) (x->lookups && x->nsort > -1 && \ |
| 107 | x->nservers > -1 && \ |
| 108 | x->ndomains > -1 && \ |
| 109 | x->ndots > -1 && x->timeout > -1 && \ |
| 110 | x->tries > -1) |
| 111 | |
| 112 | int ares_init(ares_channel *channelptr) |
| 113 | { |
| 114 | return ares_init_options(channelptr, NULL, 0); |
| 115 | } |
| 116 | |
| 117 | int ares_init_options(ares_channel *channelptr, struct ares_options *options, |
| 118 | int optmask) |
| 119 | { |
| 120 | ares_channel channel; |
| 121 | int i; |
| 122 | int status = ARES_SUCCESS; |
| 123 | struct timeval now; |
| 124 | |
| 125 | #ifdef CURLDEBUG |
| 126 | const char *env = getenv("CARES_MEMDEBUG"); |
| 127 | |
| 128 | if (env) |
| 129 | curl_memdebug(env); |
| 130 | env = getenv("CARES_MEMLIMIT"); |
| 131 | if (env) { |
| 132 | char *endptr; |
| 133 | long num = strtol(env, &endptr, 10); |
| 134 | if((endptr != env) && (endptr == env + strlen(env)) && (num > 0)) |
| 135 | curl_memlimit(num); |
| 136 | } |
| 137 | #endif |
| 138 | |
| 139 | if (ares_library_initialized() != ARES_SUCCESS) |
| 140 | return ARES_ENOTINITIALIZED; |
| 141 | |
| 142 | channel = malloc(sizeof(struct ares_channeldata)); |
| 143 | if (!channel) { |
| 144 | *channelptr = NULL; |
| 145 | return ARES_ENOMEM; |
| 146 | } |
| 147 | |
| 148 | now = ares__tvnow(); |
| 149 | |
| 150 | /* Set everything to distinguished values so we know they haven't |
| 151 | * been set yet. |
| 152 | */ |
| 153 | channel->flags = -1; |
| 154 | channel->timeout = -1; |
| 155 | channel->tries = -1; |
| 156 | channel->ndots = -1; |
| 157 | channel->rotate = -1; |
| 158 | channel->udp_port = -1; |
| 159 | channel->tcp_port = -1; |
| 160 | channel->socket_send_buffer_size = -1; |
| 161 | channel->socket_receive_buffer_size = -1; |
| 162 | channel->nservers = -1; |
| 163 | channel->ndomains = -1; |
| 164 | channel->nsort = -1; |
| 165 | channel->tcp_connection_generation = 0; |
| 166 | channel->lookups = NULL; |
| 167 | channel->domains = NULL; |
| 168 | channel->sortlist = NULL; |
| 169 | channel->servers = NULL; |
| 170 | channel->sock_state_cb = NULL; |
| 171 | channel->sock_state_cb_data = NULL; |
| 172 | channel->sock_create_cb = NULL; |
| 173 | channel->sock_create_cb_data = NULL; |
| 174 | |
| 175 | channel->last_server = 0; |
| 176 | channel->last_timeout_processed = (time_t)now.tv_sec; |
| 177 | |
| 178 | memset(&channel->local_dev_name, 0, sizeof(channel->local_dev_name)); |
| 179 | channel->local_ip4 = 0; |
| 180 | memset(&channel->local_ip6, 0, sizeof(channel->local_ip6)); |
| 181 | |
| 182 | /* Initialize our lists of queries */ |
| 183 | ares__init_list_head(&(channel->all_queries)); |
| 184 | for (i = 0; i < ARES_QID_TABLE_SIZE; i++) |
| 185 | { |
| 186 | ares__init_list_head(&(channel->queries_by_qid[i])); |
| 187 | } |
| 188 | for (i = 0; i < ARES_TIMEOUT_TABLE_SIZE; i++) |
| 189 | { |
| 190 | ares__init_list_head(&(channel->queries_by_timeout[i])); |
| 191 | } |
| 192 | |
| 193 | /* Initialize configuration by each of the four sources, from highest |
| 194 | * precedence to lowest. |
| 195 | */ |
| 196 | |
| 197 | if (status == ARES_SUCCESS) { |
| 198 | status = init_by_options(channel, options, optmask); |
| 199 | if (status != ARES_SUCCESS) |
| 200 | DEBUGF(fprintf(stderr, "Error: init_by_options failed: %s\n", |
| 201 | ares_strerror(status))); |
| 202 | } |
| 203 | if (status == ARES_SUCCESS) { |
| 204 | status = init_by_environment(channel); |
| 205 | if (status != ARES_SUCCESS) |
| 206 | DEBUGF(fprintf(stderr, "Error: init_by_environment failed: %s\n", |
| 207 | ares_strerror(status))); |
| 208 | } |
| 209 | if (status == ARES_SUCCESS) { |
| 210 | status = init_by_resolv_conf(channel); |
| 211 | if (status != ARES_SUCCESS) |
| 212 | DEBUGF(fprintf(stderr, "Error: init_by_resolv_conf failed: %s\n", |
| 213 | ares_strerror(status))); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * No matter what failed or succeeded, seed defaults to provide |
| 218 | * useful behavior for things that we missed. |
| 219 | */ |
| 220 | status = init_by_defaults(channel); |
| 221 | if (status != ARES_SUCCESS) |
| 222 | DEBUGF(fprintf(stderr, "Error: init_by_defaults failed: %s\n", |
| 223 | ares_strerror(status))); |
| 224 | |
| 225 | /* Generate random key */ |
| 226 | |
| 227 | if (status == ARES_SUCCESS) { |
| 228 | status = init_id_key(&channel->id_key, ARES_ID_KEY_LEN); |
| 229 | if (status == ARES_SUCCESS) |
| 230 | channel->next_id = ares__generate_new_id(&channel->id_key); |
| 231 | else |
| 232 | DEBUGF(fprintf(stderr, "Error: init_id_key failed: %s\n", |
| 233 | ares_strerror(status))); |
| 234 | } |
| 235 | |
| 236 | if (status != ARES_SUCCESS) |
| 237 | { |
| 238 | /* Something failed; clean up memory we may have allocated. */ |
| 239 | if (channel->servers) |
| 240 | free(channel->servers); |
| 241 | if (channel->domains) |
| 242 | { |
| 243 | for (i = 0; i < channel->ndomains; i++) |
| 244 | free(channel->domains[i]); |
| 245 | free(channel->domains); |
| 246 | } |
| 247 | if (channel->sortlist) |
| 248 | free(channel->sortlist); |
| 249 | if(channel->lookups) |
| 250 | free(channel->lookups); |
| 251 | free(channel); |
| 252 | return status; |
| 253 | } |
| 254 | |
| 255 | /* Trim to one server if ARES_FLAG_PRIMARY is set. */ |
| 256 | if ((channel->flags & ARES_FLAG_PRIMARY) && channel->nservers > 1) |
| 257 | channel->nservers = 1; |
| 258 | |
| 259 | ares__init_servers_state(channel); |
| 260 | |
| 261 | *channelptr = channel; |
| 262 | return ARES_SUCCESS; |
| 263 | } |
| 264 | |
| 265 | /* ares_dup() duplicates a channel handle with all its options and returns a |
| 266 | new channel handle */ |
| 267 | int ares_dup(ares_channel *dest, ares_channel src) |
| 268 | { |
| 269 | struct ares_options opts; |
| 270 | struct ares_addr_node *servers; |
| 271 | int ipv6_nservers = 0; |
| 272 | int i, rc; |
| 273 | int optmask; |
| 274 | |
| 275 | *dest = NULL; /* in case of failure return NULL explicitly */ |
| 276 | |
| 277 | /* First get the options supported by the old ares_save_options() function, |
| 278 | which is most of them */ |
| 279 | rc = ares_save_options(src, &opts, &optmask); |
| 280 | if(rc) |
| 281 | return rc; |
| 282 | |
| 283 | /* Then create the new channel with those options */ |
| 284 | rc = ares_init_options(dest, &opts, optmask); |
| 285 | |
| 286 | /* destroy the options copy to not leak any memory */ |
| 287 | ares_destroy_options(&opts); |
| 288 | |
| 289 | if(rc) |
| 290 | return rc; |
| 291 | |
| 292 | /* Now clone the options that ares_save_options() doesn't support. */ |
| 293 | (*dest)->sock_create_cb = src->sock_create_cb; |
| 294 | (*dest)->sock_create_cb_data = src->sock_create_cb_data; |
| 295 | |
| 296 | strncpy((*dest)->local_dev_name, src->local_dev_name, sizeof(src->local_dev_name)); |
| 297 | (*dest)->local_ip4 = src->local_ip4; |
| 298 | memcpy((*dest)->local_ip6, src->local_ip6, sizeof(src->local_ip6)); |
| 299 | |
| 300 | /* Full name server cloning required when not all are IPv4 */ |
| 301 | for (i = 0; i < src->nservers; i++) |
| 302 | { |
| 303 | if (src->servers[i].addr.family != AF_INET) { |
| 304 | ipv6_nservers++; |
| 305 | break; |
| 306 | } |
| 307 | } |
| 308 | if (ipv6_nservers) { |
| 309 | rc = ares_get_servers(src, &servers); |
| 310 | if (rc != ARES_SUCCESS) |
| 311 | return rc; |
| 312 | rc = ares_set_servers(*dest, servers); |
| 313 | ares_free_data(servers); |
| 314 | if (rc != ARES_SUCCESS) |
| 315 | return rc; |
| 316 | } |
| 317 | |
| 318 | return ARES_SUCCESS; /* everything went fine */ |
| 319 | } |
| 320 | |
| 321 | /* Save options from initialized channel */ |
| 322 | int ares_save_options(ares_channel channel, struct ares_options *options, |
| 323 | int *optmask) |
| 324 | { |
| 325 | int i, j; |
| 326 | int ipv4_nservers = 0; |
| 327 | |
| 328 | /* Zero everything out */ |
| 329 | memset(options, 0, sizeof(struct ares_options)); |
| 330 | |
| 331 | if (!ARES_CONFIG_CHECK(channel)) |
| 332 | return ARES_ENODATA; |
| 333 | |
| 334 | /* Traditionally the optmask wasn't saved in the channel struct so it was |
| 335 | recreated here. ROTATE is the first option that has no struct field of |
| 336 | its own in the public config struct */ |
| 337 | (*optmask) = (ARES_OPT_FLAGS|ARES_OPT_TRIES|ARES_OPT_NDOTS| |
| 338 | ARES_OPT_UDP_PORT|ARES_OPT_TCP_PORT|ARES_OPT_SOCK_STATE_CB| |
| 339 | ARES_OPT_SERVERS|ARES_OPT_DOMAINS|ARES_OPT_LOOKUPS| |
| 340 | ARES_OPT_SORTLIST|ARES_OPT_TIMEOUTMS) | |
| 341 | (channel->optmask & ARES_OPT_ROTATE); |
| 342 | |
| 343 | /* Copy easy stuff */ |
| 344 | options->flags = channel->flags; |
| 345 | |
| 346 | /* We return full millisecond resolution but that's only because we don't |
| 347 | set the ARES_OPT_TIMEOUT anymore, only the new ARES_OPT_TIMEOUTMS */ |
| 348 | options->timeout = channel->timeout; |
| 349 | options->tries = channel->tries; |
| 350 | options->ndots = channel->ndots; |
| 351 | options->udp_port = (unsigned short)channel->udp_port; |
| 352 | options->tcp_port = (unsigned short)channel->tcp_port; |
| 353 | options->sock_state_cb = channel->sock_state_cb; |
| 354 | options->sock_state_cb_data = channel->sock_state_cb_data; |
| 355 | |
| 356 | /* Copy IPv4 servers */ |
| 357 | if (channel->nservers) { |
| 358 | for (i = 0; i < channel->nservers; i++) |
| 359 | { |
| 360 | if (channel->servers[i].addr.family == AF_INET) |
| 361 | ipv4_nservers++; |
| 362 | } |
| 363 | if (ipv4_nservers) { |
| 364 | options->servers = malloc(ipv4_nservers * sizeof(struct in_addr)); |
| 365 | if (!options->servers) |
| 366 | return ARES_ENOMEM; |
| 367 | for (i = j = 0; i < channel->nservers; i++) |
| 368 | { |
| 369 | if (channel->servers[i].addr.family == AF_INET) |
| 370 | memcpy(&options->servers[j++], |
| 371 | &channel->servers[i].addr.addrV4, |
| 372 | sizeof(channel->servers[i].addr.addrV4)); |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | options->nservers = ipv4_nservers; |
| 377 | |
| 378 | /* copy domains */ |
| 379 | if (channel->ndomains) { |
| 380 | options->domains = malloc(channel->ndomains * sizeof(char *)); |
| 381 | if (!options->domains) |
| 382 | return ARES_ENOMEM; |
| 383 | |
| 384 | for (i = 0; i < channel->ndomains; i++) |
| 385 | { |
| 386 | options->ndomains = i; |
| 387 | options->domains[i] = strdup(channel->domains[i]); |
| 388 | if (!options->domains[i]) |
| 389 | return ARES_ENOMEM; |
| 390 | } |
| 391 | } |
| 392 | options->ndomains = channel->ndomains; |
| 393 | |
| 394 | /* copy lookups */ |
| 395 | if (channel->lookups) { |
| 396 | options->lookups = strdup(channel->lookups); |
| 397 | if (!options->lookups && channel->lookups) |
| 398 | return ARES_ENOMEM; |
| 399 | } |
| 400 | |
| 401 | /* copy sortlist */ |
| 402 | if (channel->nsort) { |
| 403 | options->sortlist = malloc(channel->nsort * sizeof(struct apattern)); |
| 404 | if (!options->sortlist) |
| 405 | return ARES_ENOMEM; |
| 406 | for (i = 0; i < channel->nsort; i++) |
| 407 | options->sortlist[i] = channel->sortlist[i]; |
| 408 | } |
| 409 | options->nsort = channel->nsort; |
| 410 | |
| 411 | return ARES_SUCCESS; |
| 412 | } |
| 413 | |
| 414 | static int init_by_options(ares_channel channel, |
| 415 | const struct ares_options *options, |
| 416 | int optmask) |
| 417 | { |
| 418 | int i; |
| 419 | |
| 420 | /* Easy stuff. */ |
| 421 | if ((optmask & ARES_OPT_FLAGS) && channel->flags == -1) |
| 422 | channel->flags = options->flags; |
| 423 | if ((optmask & ARES_OPT_TIMEOUTMS) && channel->timeout == -1) |
| 424 | channel->timeout = options->timeout; |
| 425 | else if ((optmask & ARES_OPT_TIMEOUT) && channel->timeout == -1) |
| 426 | channel->timeout = options->timeout * 1000; |
| 427 | if ((optmask & ARES_OPT_TRIES) && channel->tries == -1) |
| 428 | channel->tries = options->tries; |
| 429 | if ((optmask & ARES_OPT_NDOTS) && channel->ndots == -1) |
| 430 | channel->ndots = options->ndots; |
| 431 | if ((optmask & ARES_OPT_ROTATE) && channel->rotate == -1) |
| 432 | channel->rotate = 1; |
| 433 | if ((optmask & ARES_OPT_UDP_PORT) && channel->udp_port == -1) |
| 434 | channel->udp_port = options->udp_port; |
| 435 | if ((optmask & ARES_OPT_TCP_PORT) && channel->tcp_port == -1) |
| 436 | channel->tcp_port = options->tcp_port; |
| 437 | if ((optmask & ARES_OPT_SOCK_STATE_CB) && channel->sock_state_cb == NULL) |
| 438 | { |
| 439 | channel->sock_state_cb = options->sock_state_cb; |
| 440 | channel->sock_state_cb_data = options->sock_state_cb_data; |
| 441 | } |
| 442 | if ((optmask & ARES_OPT_SOCK_SNDBUF) |
| 443 | && channel->socket_send_buffer_size == -1) |
| 444 | channel->socket_send_buffer_size = options->socket_send_buffer_size; |
| 445 | if ((optmask & ARES_OPT_SOCK_RCVBUF) |
| 446 | && channel->socket_receive_buffer_size == -1) |
| 447 | channel->socket_receive_buffer_size = options->socket_receive_buffer_size; |
| 448 | |
| 449 | /* Copy the IPv4 servers, if given. */ |
| 450 | if ((optmask & ARES_OPT_SERVERS) && channel->nservers == -1) |
| 451 | { |
| 452 | /* Avoid zero size allocations at any cost */ |
| 453 | if (options->nservers > 0) |
| 454 | { |
| 455 | channel->servers = |
| 456 | malloc(options->nservers * sizeof(struct server_state)); |
| 457 | if (!channel->servers) |
| 458 | return ARES_ENOMEM; |
| 459 | for (i = 0; i < options->nservers; i++) |
| 460 | { |
| 461 | channel->servers[i].addr.family = AF_INET; |
| 462 | memcpy(&channel->servers[i].addr.addrV4, |
| 463 | &options->servers[i], |
| 464 | sizeof(channel->servers[i].addr.addrV4)); |
| 465 | } |
| 466 | } |
| 467 | channel->nservers = options->nservers; |
| 468 | } |
| 469 | |
| 470 | /* Copy the domains, if given. Keep channel->ndomains consistent so |
| 471 | * we can clean up in case of error. |
| 472 | */ |
| 473 | if ((optmask & ARES_OPT_DOMAINS) && channel->ndomains == -1) |
| 474 | { |
| 475 | /* Avoid zero size allocations at any cost */ |
| 476 | if (options->ndomains > 0) |
| 477 | { |
| 478 | channel->domains = malloc(options->ndomains * sizeof(char *)); |
| 479 | if (!channel->domains) |
| 480 | return ARES_ENOMEM; |
| 481 | for (i = 0; i < options->ndomains; i++) |
| 482 | { |
| 483 | channel->ndomains = i; |
| 484 | channel->domains[i] = strdup(options->domains[i]); |
| 485 | if (!channel->domains[i]) |
| 486 | return ARES_ENOMEM; |
| 487 | } |
| 488 | } |
| 489 | channel->ndomains = options->ndomains; |
| 490 | } |
| 491 | |
| 492 | /* Set lookups, if given. */ |
| 493 | if ((optmask & ARES_OPT_LOOKUPS) && !channel->lookups) |
| 494 | { |
| 495 | channel->lookups = strdup(options->lookups); |
| 496 | if (!channel->lookups) |
| 497 | return ARES_ENOMEM; |
| 498 | } |
| 499 | |
| 500 | /* copy sortlist */ |
| 501 | if ((optmask & ARES_OPT_SORTLIST) && (channel->nsort == -1) && |
| 502 | (options->nsort>0)) { |
| 503 | channel->sortlist = malloc(options->nsort * sizeof(struct apattern)); |
| 504 | if (!channel->sortlist) |
| 505 | return ARES_ENOMEM; |
| 506 | for (i = 0; i < options->nsort; i++) |
| 507 | channel->sortlist[i] = options->sortlist[i]; |
| 508 | channel->nsort = options->nsort; |
| 509 | } |
| 510 | |
| 511 | channel->optmask = optmask; |
| 512 | |
| 513 | return ARES_SUCCESS; |
| 514 | } |
| 515 | |
| 516 | static int init_by_environment(ares_channel channel) |
| 517 | { |
| 518 | const char *localdomain, *res_options; |
| 519 | int status; |
| 520 | |
| 521 | localdomain = getenv("LOCALDOMAIN"); |
| 522 | if (localdomain && channel->ndomains == -1) |
| 523 | { |
| 524 | status = set_search(channel, localdomain); |
| 525 | if (status != ARES_SUCCESS) |
| 526 | return status; |
| 527 | } |
| 528 | |
| 529 | res_options = getenv("RES_OPTIONS"); |
| 530 | if (res_options) |
| 531 | { |
| 532 | status = set_options(channel, res_options); |
| 533 | if (status != ARES_SUCCESS) |
| 534 | return status; |
| 535 | } |
| 536 | |
| 537 | return ARES_SUCCESS; |
| 538 | } |
| 539 | |
| 540 | #ifdef WIN32 |
| 541 | /* |
| 542 | * Warning: returns a dynamically allocated buffer, the user MUST |
| 543 | * use free() if the function returns 1 |
| 544 | */ |
| 545 | static int get_res_nt(HKEY hKey, const char *subkey, char **obuf) |
| 546 | { |
| 547 | /* Test for the size we need */ |
| 548 | DWORD size = 0; |
| 549 | int result; |
| 550 | |
| 551 | result = RegQueryValueEx(hKey, subkey, 0, NULL, NULL, &size); |
| 552 | if ((result != ERROR_SUCCESS && result != ERROR_MORE_DATA) || !size) |
| 553 | return 0; |
| 554 | *obuf = malloc(size+1); |
| 555 | if (!*obuf) |
| 556 | return 0; |
| 557 | |
| 558 | if (RegQueryValueEx(hKey, subkey, 0, NULL, |
| 559 | (LPBYTE)*obuf, &size) != ERROR_SUCCESS) |
| 560 | { |
| 561 | free(*obuf); |
| 562 | return 0; |
| 563 | } |
| 564 | if (size == 1) |
| 565 | { |
| 566 | free(*obuf); |
| 567 | return 0; |
| 568 | } |
| 569 | return 1; |
| 570 | } |
| 571 | |
| 572 | static int get_res_interfaces_nt(HKEY hKey, const char *subkey, char **obuf) |
| 573 | { |
| 574 | char enumbuf[39]; /* GUIDs are 38 chars + 1 for NULL */ |
| 575 | DWORD enum_size = 39; |
| 576 | int idx = 0; |
| 577 | HKEY hVal; |
| 578 | |
| 579 | while (RegEnumKeyEx(hKey, idx++, enumbuf, &enum_size, 0, |
| 580 | NULL, NULL, NULL) != ERROR_NO_MORE_ITEMS) |
| 581 | { |
| 582 | int rc; |
| 583 | |
| 584 | enum_size = 39; |
| 585 | if (RegOpenKeyEx(hKey, enumbuf, 0, KEY_QUERY_VALUE, &hVal) != |
| 586 | ERROR_SUCCESS) |
| 587 | continue; |
| 588 | rc = get_res_nt(hVal, subkey, obuf); |
| 589 | RegCloseKey(hVal); |
| 590 | if (rc) |
| 591 | return 1; |
| 592 | } |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * The desired output for this method is that we set "ret_buf" to |
| 598 | * something like: |
| 599 | * |
| 600 | * 192.168.0.1,dns01.my.domain,fe80::200:f8ff:fe21:67cf |
| 601 | * |
| 602 | * The only ordering requirement is that primary servers are listed |
| 603 | * before secondary. There is no requirement that IPv4 addresses should |
| 604 | * necessarily be before IPv6. |
| 605 | * |
| 606 | * Note that ret_size should ideally be big enough to hold around |
| 607 | * 2-3 IPv4 and 2-3 IPv6 addresses. |
| 608 | * |
| 609 | * Finally, we need to return the total number of DNS servers located. |
| 610 | */ |
| 611 | static int get_iphlpapi_dns_info (char *ret_buf, size_t ret_size) |
| 612 | { |
| 613 | const size_t ipv4_size = INET_ADDRSTRLEN + 1; /* +1 for ',' at end */ |
| 614 | const size_t ipv6_size = INET6_ADDRSTRLEN + 12; /* +12 for "%0123456789," at end */ |
| 615 | size_t left = ret_size; |
| 616 | char *ret = ret_buf; |
| 617 | int count = 0; |
| 618 | |
| 619 | /* Use the GetAdaptersAddresses method if it's available, otherwise |
| 620 | fall back to GetNetworkParams. */ |
| 621 | if (ares_fpGetAdaptersAddresses != ZERO_NULL) |
| 622 | { |
| 623 | const ULONG working_buf_size = 15000; |
| 624 | IP_ADAPTER_ADDRESSES *pFirstEntry = NULL; |
| 625 | IP_ADAPTER_ADDRESSES *pEntry = NULL; |
| 626 | ULONG bufSize = 0; |
| 627 | ULONG result = 0; |
| 628 | |
| 629 | /* According to MSDN, the recommended way to do this is to use a temporary |
| 630 | buffer of 15K, to "dramatically reduce the chance that the GetAdaptersAddresses |
| 631 | method returns ERROR_BUFFER_OVERFLOW" */ |
| 632 | pFirstEntry = ( IP_ADAPTER_ADDRESSES * ) malloc( working_buf_size ); |
| 633 | bufSize = working_buf_size; |
| 634 | if( !pFirstEntry ) |
| 635 | return 0; |
| 636 | |
| 637 | /* Call the method one time */ |
| 638 | result = ( *ares_fpGetAdaptersAddresses )( AF_UNSPEC, 0, 0, pFirstEntry, &bufSize ); |
| 639 | if( result == ERROR_BUFFER_OVERFLOW ) |
| 640 | { |
| 641 | /* Reallocate, bufSize should now be set to the required size */ |
| 642 | pFirstEntry = ( IP_ADAPTER_ADDRESSES * ) realloc( pFirstEntry, bufSize ); |
| 643 | if( !pFirstEntry ) |
| 644 | return 0; |
| 645 | |
| 646 | /* Call the method a second time */ |
| 647 | result = ( *ares_fpGetAdaptersAddresses )( AF_UNSPEC, 0, 0, pFirstEntry, &bufSize ); |
| 648 | if( result == ERROR_BUFFER_OVERFLOW ) |
| 649 | { |
| 650 | /* Reallocate, bufSize should now be set to the required size */ |
| 651 | pFirstEntry = ( IP_ADAPTER_ADDRESSES * ) realloc( pFirstEntry, bufSize ); |
| 652 | if( !pFirstEntry ) |
| 653 | return 0; |
| 654 | |
| 655 | /* Call the method a third time. The maximum number of times we're going to do |
| 656 | this is 3. Three shall be the number thou shalt count, and the number of the |
| 657 | counting shall be three. Five is right out. */ |
| 658 | result = ( *ares_fpGetAdaptersAddresses )( AF_UNSPEC, 0, 0, pFirstEntry, &bufSize ); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | /* Check the current result for failure */ |
| 663 | if( result != ERROR_SUCCESS ) |
| 664 | { |
| 665 | free( pFirstEntry ); |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | /* process the results */ |
| 670 | for( pEntry = pFirstEntry ; pEntry != NULL ; pEntry = pEntry->Next ) |
| 671 | { |
| 672 | IP_ADAPTER_DNS_SERVER_ADDRESS* pDNSAddr = pEntry->FirstDnsServerAddress; |
| 673 | for( ; pDNSAddr != NULL ; pDNSAddr = pDNSAddr->Next ) |
| 674 | { |
| 675 | struct sockaddr *pGenericAddr = pDNSAddr->Address.lpSockaddr; |
| 676 | size_t stringlen = 0; |
| 677 | |
| 678 | if( pGenericAddr->sa_family == AF_INET && left > ipv4_size ) |
| 679 | { |
| 680 | /* Handle the v4 case */ |
| 681 | struct sockaddr_in *pIPv4Addr = ( struct sockaddr_in * ) pGenericAddr; |
| 682 | ares_inet_ntop( AF_INET, &pIPv4Addr->sin_addr, ret, ipv4_size - 1 ); /* -1 for comma */ |
| 683 | |
| 684 | /* Append a comma to the end, THEN NULL. Should be OK because we |
| 685 | already tested the size at the top of the if statement. */ |
| 686 | stringlen = strlen( ret ); |
| 687 | ret[ stringlen ] = ','; |
| 688 | ret[ stringlen + 1 ] = '\0'; |
| 689 | ret += stringlen + 1; |
| 690 | left -= ret - ret_buf; |
| 691 | ++count; |
| 692 | } |
| 693 | else if( pGenericAddr->sa_family == AF_INET6 && left > ipv6_size ) |
| 694 | { |
| 695 | /* Handle the v6 case */ |
| 696 | struct sockaddr_in6 *pIPv6Addr = ( struct sockaddr_in6 * ) pGenericAddr; |
| 697 | ares_inet_ntop( AF_INET6, &pIPv6Addr->sin6_addr, ret, ipv6_size - 1 ); /* -1 for comma */ |
| 698 | |
| 699 | /* Append a comma to the end, THEN NULL. Should be OK because we |
| 700 | already tested the size at the top of the if statement. */ |
| 701 | stringlen = strlen( ret ); |
| 702 | ret[ stringlen ] = ','; |
| 703 | ret[ stringlen + 1 ] = '\0'; |
| 704 | ret += stringlen + 1; |
| 705 | left -= ret - ret_buf; |
| 706 | ++count; |
| 707 | |
| 708 | /* NB on Windows this also returns stuff in the fec0::/10 range, |
| 709 | seems to be hard-coded somehow. Do we need to ignore them? */ |
| 710 | } |
| 711 | } |
| 712 | } |
| 713 | |
| 714 | if( pFirstEntry ) |
| 715 | free( pFirstEntry ); |
| 716 | if (ret > ret_buf) |
| 717 | ret[-1] = '\0'; |
| 718 | return count; |
| 719 | } |
| 720 | else |
| 721 | { |
| 722 | FIXED_INFO *fi, *newfi; |
| 723 | DWORD size = sizeof (*fi); |
| 724 | IP_ADDR_STRING *ipAddr; |
| 725 | int i; |
| 726 | int debug = 0; |
| 727 | HRESULT res; |
| 728 | |
| 729 | fi = malloc(size); |
| 730 | if (!fi) |
| 731 | return 0; |
| 732 | |
| 733 | res = (*ares_fpGetNetworkParams) (fi, &size); |
| 734 | if ((res != ERROR_BUFFER_OVERFLOW) && (res != ERROR_SUCCESS)) |
| 735 | goto quit; |
| 736 | |
| 737 | newfi = realloc(fi, size); |
| 738 | if (!newfi) |
| 739 | goto quit; |
| 740 | |
| 741 | fi = newfi; |
| 742 | res = (*ares_fpGetNetworkParams) (fi, &size); |
| 743 | if (res != ERROR_SUCCESS) |
| 744 | goto quit; |
| 745 | |
| 746 | if (debug) |
| 747 | { |
| 748 | printf ("Host Name: %s\n", fi->HostName); |
| 749 | printf ("Domain Name: %s\n", fi->DomainName); |
| 750 | printf ("DNS Servers:\n" |
| 751 | " %s (primary)\n", fi->DnsServerList.IpAddress.String); |
| 752 | } |
| 753 | if (strlen(fi->DnsServerList.IpAddress.String) > 0 && |
| 754 | inet_addr(fi->DnsServerList.IpAddress.String) != INADDR_NONE && |
| 755 | left > ipv4_size) |
| 756 | { |
| 757 | ret += sprintf (ret, "%s,", fi->DnsServerList.IpAddress.String); |
| 758 | left -= ret - ret_buf; |
| 759 | ++count; |
| 760 | } |
| 761 | |
| 762 | for (i = 0, ipAddr = fi->DnsServerList.Next; ipAddr && left > ipv4_size; |
| 763 | ipAddr = ipAddr->Next, i++) |
| 764 | { |
| 765 | if (inet_addr(ipAddr->IpAddress.String) != INADDR_NONE) |
| 766 | { |
| 767 | ret += sprintf (ret, "%s,", ipAddr->IpAddress.String); |
| 768 | left -= ret - ret_buf; |
| 769 | ++count; |
| 770 | } |
| 771 | if (debug) |
| 772 | printf (" %s (secondary %d)\n", ipAddr->IpAddress.String, i+1); |
| 773 | } |
| 774 | |
| 775 | quit: |
| 776 | if (fi) |
| 777 | free(fi); |
| 778 | |
| 779 | if (debug && left <= ipv4_size) |
| 780 | printf ("Too many nameservers. Truncating to %d addressess", count); |
| 781 | if (ret > ret_buf) |
| 782 | ret[-1] = '\0'; |
| 783 | return count; |
| 784 | } |
| 785 | } |
| 786 | #endif |
| 787 | |
| 788 | static int init_by_resolv_conf(ares_channel channel) |
| 789 | { |
| 790 | #ifndef WATT32 |
| 791 | char *line = NULL; |
| 792 | #endif |
| 793 | int status = -1, nservers = 0, nsort = 0; |
| 794 | struct server_state *servers = NULL; |
| 795 | struct apattern *sortlist = NULL; |
| 796 | |
| 797 | #ifdef WIN32 |
| 798 | |
| 799 | /* |
| 800 | NameServer info via IPHLPAPI (IP helper API): |
| 801 | GetNetworkParams() should be the trusted source for this. |
| 802 | Available in Win-98/2000 and later. If that fail, fall-back to |
| 803 | registry information. |
| 804 | |
| 805 | NameServer Registry: |
| 806 | |
| 807 | On Windows 9X, the DNS server can be found in: |
| 808 | HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP\NameServer |
| 809 | |
| 810 | On Windows NT/2000/XP/2003: |
| 811 | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\NameServer |
| 812 | or |
| 813 | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DhcpNameServer |
| 814 | or |
| 815 | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\{AdapterID}\ |
| 816 | NameServer |
| 817 | or |
| 818 | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\{AdapterID}\ |
| 819 | DhcpNameServer |
| 820 | */ |
| 821 | |
| 822 | HKEY mykey; |
| 823 | HKEY subkey; |
| 824 | DWORD data_type; |
| 825 | DWORD bytes; |
| 826 | DWORD result; |
| 827 | char buf[512]; |
| 828 | win_platform platform; |
| 829 | |
| 830 | if (channel->nservers > -1) /* don't override ARES_OPT_SERVER */ |
| 831 | return ARES_SUCCESS; |
| 832 | |
| 833 | if (get_iphlpapi_dns_info(buf,sizeof(buf)) > 0) |
| 834 | { |
| 835 | status = config_nameserver(&servers, &nservers, buf); |
| 836 | if (status == ARES_SUCCESS) |
| 837 | goto okay; |
| 838 | } |
| 839 | |
| 840 | platform = ares__getplatform(); |
| 841 | |
| 842 | if (platform == WIN_NT) |
| 843 | { |
| 844 | if (RegOpenKeyEx( |
| 845 | HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, |
| 846 | KEY_READ, &mykey |
| 847 | ) == ERROR_SUCCESS) |
| 848 | { |
| 849 | RegOpenKeyEx(mykey, "Interfaces", 0, |
| 850 | KEY_QUERY_VALUE|KEY_ENUMERATE_SUB_KEYS, &subkey); |
| 851 | if (get_res_nt(mykey, NAMESERVER, &line)) |
| 852 | { |
| 853 | status = config_nameserver(&servers, &nservers, line); |
| 854 | free(line); |
| 855 | } |
| 856 | else if (get_res_nt(mykey, DHCPNAMESERVER, &line)) |
| 857 | { |
| 858 | status = config_nameserver(&servers, &nservers, line); |
| 859 | free(line); |
| 860 | } |
| 861 | /* Try the interfaces */ |
| 862 | else if (get_res_interfaces_nt(subkey, NAMESERVER, &line)) |
| 863 | { |
| 864 | status = config_nameserver(&servers, &nservers, line); |
| 865 | free(line); |
| 866 | } |
| 867 | else if (get_res_interfaces_nt(subkey, DHCPNAMESERVER, &line)) |
| 868 | { |
| 869 | status = config_nameserver(&servers, &nservers, line); |
| 870 | free(line); |
| 871 | } |
| 872 | RegCloseKey(subkey); |
| 873 | RegCloseKey(mykey); |
| 874 | } |
| 875 | } |
| 876 | else if (platform == WIN_9X) |
| 877 | { |
| 878 | if (RegOpenKeyEx( |
| 879 | HKEY_LOCAL_MACHINE, WIN_NS_9X, 0, |
| 880 | KEY_READ, &mykey |
| 881 | ) == ERROR_SUCCESS) |
| 882 | { |
| 883 | if ((result = RegQueryValueEx( |
| 884 | mykey, NAMESERVER, NULL, &data_type, |
| 885 | NULL, &bytes |
| 886 | ) |
| 887 | ) == ERROR_SUCCESS || |
| 888 | result == ERROR_MORE_DATA) |
| 889 | { |
| 890 | if (bytes) |
| 891 | { |
| 892 | line = malloc(bytes+1); |
| 893 | if (RegQueryValueEx(mykey, NAMESERVER, NULL, &data_type, |
| 894 | (unsigned char *)line, &bytes) == |
| 895 | ERROR_SUCCESS) |
| 896 | { |
| 897 | status = config_nameserver(&servers, &nservers, line); |
| 898 | } |
| 899 | free(line); |
| 900 | } |
| 901 | } |
| 902 | } |
| 903 | RegCloseKey(mykey); |
| 904 | } |
| 905 | |
| 906 | if (status == ARES_SUCCESS) |
| 907 | status = ARES_EOF; |
| 908 | else |
| 909 | /* Catch the case when all the above checks fail (which happens when there |
| 910 | is no network card or the cable is unplugged) */ |
| 911 | status = ARES_EFILE; |
| 912 | |
| 913 | #elif defined(__riscos__) |
| 914 | |
| 915 | /* Under RISC OS, name servers are listed in the |
| 916 | system variable Inet$Resolvers, space separated. */ |
| 917 | |
| 918 | line = getenv("Inet$Resolvers"); |
| 919 | status = ARES_EOF; |
| 920 | if (line) { |
| 921 | char *resolvers = strdup(line), *pos, *space; |
| 922 | |
| 923 | if (!resolvers) |
| 924 | return ARES_ENOMEM; |
| 925 | |
| 926 | pos = resolvers; |
| 927 | do { |
| 928 | space = strchr(pos, ' '); |
| 929 | if (space) |
| 930 | *space = '\0'; |
| 931 | status = config_nameserver(&servers, &nservers, pos); |
| 932 | if (status != ARES_SUCCESS) |
| 933 | break; |
| 934 | pos = space + 1; |
| 935 | } while (space); |
| 936 | |
| 937 | if (status == ARES_SUCCESS) |
| 938 | status = ARES_EOF; |
| 939 | |
| 940 | free(resolvers); |
| 941 | } |
| 942 | |
| 943 | #elif defined(WATT32) |
| 944 | int i; |
| 945 | |
| 946 | sock_init(); |
| 947 | for (i = 0; def_nameservers[i]; i++) |
| 948 | ; |
| 949 | if (i == 0) |
| 950 | return ARES_SUCCESS; /* use localhost DNS server */ |
| 951 | |
| 952 | nservers = i; |
| 953 | servers = calloc(i, sizeof(struct server_state)); |
| 954 | if (!servers) |
| 955 | return ARES_ENOMEM; |
| 956 | |
| 957 | for (i = 0; def_nameservers[i]; i++) |
| 958 | { |
| 959 | servers[i].addr.addrV4.s_addr = htonl(def_nameservers[i]); |
| 960 | servers[i].addr.family = AF_INET; |
| 961 | } |
| 962 | status = ARES_EOF; |
| 963 | |
| 964 | #elif defined(ANDROID) |
| 965 | char value[PROP_VALUE_MAX]=""; |
| 966 | __system_property_get("net.dns1", value); |
| 967 | status = config_nameserver(&servers, &nservers, value); |
| 968 | if (status == ARES_SUCCESS) |
| 969 | status = ARES_EOF; |
| 970 | #else |
| 971 | { |
| 972 | char *p; |
| 973 | FILE *fp; |
| 974 | size_t linesize; |
| 975 | int error; |
| 976 | |
| 977 | /* Don't read resolv.conf and friends if we don't have to */ |
| 978 | if (ARES_CONFIG_CHECK(channel)) |
| 979 | return ARES_SUCCESS; |
| 980 | |
| 981 | fp = fopen(PATH_RESOLV_CONF, "r"); |
| 982 | if (fp) { |
| 983 | while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) |
| 984 | { |
| 985 | if ((p = try_config(line, "domain", ';'))) |
| 986 | status = config_domain(channel, p); |
| 987 | else if ((p = try_config(line, "lookup", ';')) && !channel->lookups) |
| 988 | status = config_lookup(channel, p, "bind", "file"); |
| 989 | else if ((p = try_config(line, "search", ';'))) |
| 990 | status = set_search(channel, p); |
| 991 | else if ((p = try_config(line, "nameserver", ';')) && |
| 992 | channel->nservers == -1) |
| 993 | status = config_nameserver(&servers, &nservers, p); |
| 994 | else if ((p = try_config(line, "sortlist", ';')) && |
| 995 | channel->nsort == -1) |
| 996 | status = config_sortlist(&sortlist, &nsort, p); |
| 997 | else if ((p = try_config(line, "options", ';'))) |
| 998 | status = set_options(channel, p); |
| 999 | else |
| 1000 | status = ARES_SUCCESS; |
| 1001 | if (status != ARES_SUCCESS) |
| 1002 | break; |
| 1003 | } |
| 1004 | fclose(fp); |
| 1005 | } |
| 1006 | else { |
| 1007 | error = ERRNO; |
| 1008 | switch(error) { |
| 1009 | case ENOENT: |
| 1010 | case ESRCH: |
| 1011 | status = ARES_EOF; |
| 1012 | break; |
| 1013 | default: |
| 1014 | DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", |
| 1015 | error, strerror(error))); |
| 1016 | DEBUGF(fprintf(stderr, "Error opening file: %s\n", PATH_RESOLV_CONF)); |
| 1017 | status = ARES_EFILE; |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | if ((status == ARES_EOF) && (!channel->lookups)) { |
| 1022 | /* Many systems (Solaris, Linux, BSD's) use nsswitch.conf */ |
| 1023 | fp = fopen("/etc/nsswitch.conf", "r"); |
| 1024 | if (fp) { |
| 1025 | while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) |
| 1026 | { |
| 1027 | if ((p = try_config(line, "hosts:", '\0')) && !channel->lookups) |
| 1028 | /* ignore errors */ |
| 1029 | (void)config_lookup(channel, p, "dns", "files"); |
| 1030 | } |
| 1031 | fclose(fp); |
| 1032 | } |
| 1033 | else { |
| 1034 | error = ERRNO; |
| 1035 | switch(error) { |
| 1036 | case ENOENT: |
| 1037 | case ESRCH: |
| 1038 | status = ARES_EOF; |
| 1039 | break; |
| 1040 | default: |
| 1041 | DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", |
| 1042 | error, strerror(error))); |
| 1043 | DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/nsswitch.conf")); |
| 1044 | status = ARES_EFILE; |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | if ((status == ARES_EOF) && (!channel->lookups)) { |
| 1050 | /* Linux / GNU libc 2.x and possibly others have host.conf */ |
| 1051 | fp = fopen("/etc/host.conf", "r"); |
| 1052 | if (fp) { |
| 1053 | while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) |
| 1054 | { |
| 1055 | if ((p = try_config(line, "order", '\0')) && !channel->lookups) |
| 1056 | /* ignore errors */ |
| 1057 | (void)config_lookup(channel, p, "bind", "hosts"); |
| 1058 | } |
| 1059 | fclose(fp); |
| 1060 | } |
| 1061 | else { |
| 1062 | error = ERRNO; |
| 1063 | switch(error) { |
| 1064 | case ENOENT: |
| 1065 | case ESRCH: |
| 1066 | status = ARES_EOF; |
| 1067 | break; |
| 1068 | default: |
| 1069 | DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", |
| 1070 | error, strerror(error))); |
| 1071 | DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/host.conf")); |
| 1072 | status = ARES_EFILE; |
| 1073 | } |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | if ((status == ARES_EOF) && (!channel->lookups)) { |
| 1078 | /* Tru64 uses /etc/svc.conf */ |
| 1079 | fp = fopen("/etc/svc.conf", "r"); |
| 1080 | if (fp) { |
| 1081 | while ((status = ares__read_line(fp, &line, &linesize)) == ARES_SUCCESS) |
| 1082 | { |
| 1083 | if ((p = try_config(line, "hosts=", '\0')) && !channel->lookups) |
| 1084 | /* ignore errors */ |
| 1085 | (void)config_lookup(channel, p, "bind", "local"); |
| 1086 | } |
| 1087 | fclose(fp); |
| 1088 | } |
| 1089 | else { |
| 1090 | error = ERRNO; |
| 1091 | switch(error) { |
| 1092 | case ENOENT: |
| 1093 | case ESRCH: |
| 1094 | status = ARES_EOF; |
| 1095 | break; |
| 1096 | default: |
| 1097 | DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n", |
| 1098 | error, strerror(error))); |
| 1099 | DEBUGF(fprintf(stderr, "Error opening file: %s\n", "/etc/svc.conf")); |
| 1100 | status = ARES_EFILE; |
| 1101 | } |
| 1102 | } |
| 1103 | } |
| 1104 | |
| 1105 | if(line) |
| 1106 | free(line); |
| 1107 | } |
| 1108 | |
| 1109 | #endif |
| 1110 | |
| 1111 | /* Handle errors. */ |
| 1112 | if (status != ARES_EOF) |
| 1113 | { |
| 1114 | if (servers != NULL) |
| 1115 | free(servers); |
| 1116 | if (sortlist != NULL) |
| 1117 | free(sortlist); |
| 1118 | return status; |
| 1119 | } |
| 1120 | |
| 1121 | /* If we got any name server entries, fill them in. */ |
| 1122 | #ifdef WIN32 |
| 1123 | okay: |
| 1124 | #endif |
| 1125 | if (servers) |
| 1126 | { |
| 1127 | channel->servers = servers; |
| 1128 | channel->nservers = nservers; |
| 1129 | } |
| 1130 | |
| 1131 | /* If we got any sortlist entries, fill them in. */ |
| 1132 | if (sortlist) |
| 1133 | { |
| 1134 | channel->sortlist = sortlist; |
| 1135 | channel->nsort = nsort; |
| 1136 | } |
| 1137 | |
| 1138 | return ARES_SUCCESS; |
| 1139 | } |
| 1140 | |
| 1141 | static int init_by_defaults(ares_channel channel) |
| 1142 | { |
| 1143 | char *hostname = NULL; |
| 1144 | int rc = ARES_SUCCESS; |
| 1145 | #ifdef HAVE_GETHOSTNAME |
| 1146 | char *dot; |
| 1147 | #endif |
| 1148 | |
| 1149 | if (channel->flags == -1) |
| 1150 | channel->flags = 0; |
| 1151 | if (channel->timeout == -1) |
| 1152 | channel->timeout = DEFAULT_TIMEOUT; |
| 1153 | if (channel->tries == -1) |
| 1154 | channel->tries = DEFAULT_TRIES; |
| 1155 | if (channel->ndots == -1) |
| 1156 | channel->ndots = 1; |
| 1157 | if (channel->rotate == -1) |
| 1158 | channel->rotate = 0; |
| 1159 | if (channel->udp_port == -1) |
| 1160 | channel->udp_port = htons(NAMESERVER_PORT); |
| 1161 | if (channel->tcp_port == -1) |
| 1162 | channel->tcp_port = htons(NAMESERVER_PORT); |
| 1163 | |
| 1164 | if (channel->nservers == -1) { |
| 1165 | /* If nobody specified servers, try a local named. */ |
| 1166 | channel->servers = malloc(sizeof(struct server_state)); |
| 1167 | if (!channel->servers) { |
| 1168 | rc = ARES_ENOMEM; |
| 1169 | goto error; |
| 1170 | } |
| 1171 | channel->servers[0].addr.family = AF_INET; |
| 1172 | channel->servers[0].addr.addrV4.s_addr = htonl(INADDR_LOOPBACK); |
| 1173 | channel->nservers = 1; |
| 1174 | } |
| 1175 | |
| 1176 | #if defined(USE_WINSOCK) |
| 1177 | #define toolong(x) (x == -1) && (SOCKERRNO == WSAEFAULT) |
| 1178 | #elif defined(ENAMETOOLONG) |
| 1179 | #define toolong(x) (x == -1) && ((SOCKERRNO == ENAMETOOLONG) || \ |
| 1180 | (SOCKERRNO == EINVAL)) |
| 1181 | #else |
| 1182 | #define toolong(x) (x == -1) && (SOCKERRNO == EINVAL) |
| 1183 | #endif |
| 1184 | |
| 1185 | if (channel->ndomains == -1) { |
| 1186 | /* Derive a default domain search list from the kernel hostname, |
| 1187 | * or set it to empty if the hostname isn't helpful. |
| 1188 | */ |
| 1189 | size_t len = 64; |
| 1190 | int res; |
| 1191 | channel->ndomains = 0; /* default to none */ |
| 1192 | |
| 1193 | #ifdef HAVE_GETHOSTNAME |
| 1194 | hostname = malloc(len); |
| 1195 | if(!hostname) { |
| 1196 | rc = ARES_ENOMEM; |
| 1197 | goto error; |
| 1198 | } |
| 1199 | |
| 1200 | do { |
| 1201 | res = gethostname(hostname, len); |
| 1202 | |
| 1203 | if(toolong(res)) { |
| 1204 | char *p; |
| 1205 | len *= 2; |
| 1206 | p = realloc(hostname, len); |
| 1207 | if(!p) { |
| 1208 | rc = ARES_ENOMEM; |
| 1209 | goto error; |
| 1210 | } |
| 1211 | hostname = p; |
| 1212 | continue; |
| 1213 | } |
| 1214 | else if(res) { |
| 1215 | rc = ARES_EBADNAME; |
| 1216 | goto error; |
| 1217 | } |
| 1218 | |
| 1219 | } while(0); |
| 1220 | |
| 1221 | dot = strchr(hostname, '.'); |
| 1222 | if (dot) { |
| 1223 | /* a dot was found */ |
| 1224 | channel->domains = malloc(sizeof(char *)); |
| 1225 | if (!channel->domains) { |
| 1226 | rc = ARES_ENOMEM; |
| 1227 | goto error; |
| 1228 | } |
| 1229 | channel->domains[0] = strdup(dot + 1); |
| 1230 | if (!channel->domains[0]) { |
| 1231 | rc = ARES_ENOMEM; |
| 1232 | goto error; |
| 1233 | } |
| 1234 | channel->ndomains = 1; |
| 1235 | } |
| 1236 | #endif |
| 1237 | } |
| 1238 | |
| 1239 | if (channel->nsort == -1) { |
| 1240 | channel->sortlist = NULL; |
| 1241 | channel->nsort = 0; |
| 1242 | } |
| 1243 | |
| 1244 | if (!channel->lookups) { |
| 1245 | channel->lookups = strdup("fb"); |
| 1246 | if (!channel->lookups) |
| 1247 | rc = ARES_ENOMEM; |
| 1248 | } |
| 1249 | |
| 1250 | error: |
| 1251 | if(rc) { |
| 1252 | if(channel->servers) |
| 1253 | free(channel->servers); |
| 1254 | |
| 1255 | if(channel->domains && channel->domains[0]) |
| 1256 | free(channel->domains[0]); |
| 1257 | if(channel->domains) |
| 1258 | free(channel->domains); |
| 1259 | if(channel->lookups) |
| 1260 | free(channel->lookups); |
| 1261 | } |
| 1262 | |
| 1263 | if(hostname) |
| 1264 | free(hostname); |
| 1265 | |
| 1266 | return rc; |
| 1267 | } |
| 1268 | |
| 1269 | #if !defined(WIN32) && !defined(WATT32) |
| 1270 | static int config_domain(ares_channel channel, char *str) |
| 1271 | { |
| 1272 | char *q; |
| 1273 | |
| 1274 | /* Set a single search domain. */ |
| 1275 | q = str; |
| 1276 | while (*q && !ISSPACE(*q)) |
| 1277 | q++; |
| 1278 | *q = '\0'; |
| 1279 | return set_search(channel, str); |
| 1280 | } |
| 1281 | |
| 1282 | #if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \ |
| 1283 | defined(__OPTIMIZE__) && defined(__unix__) && defined(__i386__) |
| 1284 | /* workaround icc 9.1 optimizer issue */ |
| 1285 | # define vqualifier volatile |
| 1286 | #else |
| 1287 | # define vqualifier |
| 1288 | #endif |
| 1289 | |
| 1290 | static int config_lookup(ares_channel channel, const char *str, |
| 1291 | const char *bindch, const char *filech) |
| 1292 | { |
| 1293 | char lookups[3], *l; |
| 1294 | const char *vqualifier p; |
| 1295 | |
| 1296 | /* Set the lookup order. Only the first letter of each work |
| 1297 | * is relevant, and it has to be "b" for DNS or "f" for the |
| 1298 | * host file. Ignore everything else. |
| 1299 | */ |
| 1300 | l = lookups; |
| 1301 | p = str; |
| 1302 | while (*p) |
| 1303 | { |
| 1304 | if ((*p == *bindch || *p == *filech) && l < lookups + 2) { |
| 1305 | if (*p == *bindch) *l++ = 'b'; |
| 1306 | else *l++ = 'f'; |
| 1307 | } |
| 1308 | while (*p && !ISSPACE(*p) && (*p != ',')) |
| 1309 | p++; |
| 1310 | while (*p && (ISSPACE(*p) || (*p == ','))) |
| 1311 | p++; |
| 1312 | } |
| 1313 | *l = '\0'; |
| 1314 | channel->lookups = strdup(lookups); |
| 1315 | return (channel->lookups) ? ARES_SUCCESS : ARES_ENOMEM; |
| 1316 | } |
| 1317 | #endif /* !WIN32 & !WATT32 */ |
| 1318 | |
| 1319 | #ifndef WATT32 |
| 1320 | static int config_nameserver(struct server_state **servers, int *nservers, |
| 1321 | char *str) |
| 1322 | { |
| 1323 | struct ares_addr host; |
| 1324 | struct server_state *newserv; |
| 1325 | char *p, *txtaddr; |
| 1326 | /* On Windows, there may be more than one nameserver specified in the same |
| 1327 | * registry key, so we parse input as a space or comma seperated list. |
| 1328 | */ |
| 1329 | for (p = str; p;) |
| 1330 | { |
| 1331 | /* Skip whitespace and commas. */ |
| 1332 | while (*p && (ISSPACE(*p) || (*p == ','))) |
| 1333 | p++; |
| 1334 | if (!*p) |
| 1335 | /* No more input, done. */ |
| 1336 | break; |
| 1337 | |
| 1338 | /* Pointer to start of IPv4 or IPv6 address part. */ |
| 1339 | txtaddr = p; |
| 1340 | |
| 1341 | /* Advance past this address. */ |
| 1342 | while (*p && !ISSPACE(*p) && (*p != ',')) |
| 1343 | p++; |
| 1344 | if (*p) |
| 1345 | /* Null terminate this address. */ |
| 1346 | *p++ = '\0'; |
| 1347 | else |
| 1348 | /* Reached end of input, done when this address is processed. */ |
| 1349 | p = NULL; |
| 1350 | |
| 1351 | /* Convert textual address to binary format. */ |
| 1352 | if (ares_inet_pton(AF_INET, txtaddr, &host.addrV4) == 1) |
| 1353 | host.family = AF_INET; |
| 1354 | else if (ares_inet_pton(AF_INET6, txtaddr, &host.addrV6) == 1) |
| 1355 | host.family = AF_INET6; |
| 1356 | else |
| 1357 | continue; |
| 1358 | |
| 1359 | /* Resize servers state array. */ |
| 1360 | newserv = realloc(*servers, (*nservers + 1) * |
| 1361 | sizeof(struct server_state)); |
| 1362 | if (!newserv) |
| 1363 | return ARES_ENOMEM; |
| 1364 | |
| 1365 | /* Store address data. */ |
| 1366 | newserv[*nservers].addr.family = host.family; |
| 1367 | if (host.family == AF_INET) |
| 1368 | memcpy(&newserv[*nservers].addr.addrV4, &host.addrV4, |
| 1369 | sizeof(host.addrV4)); |
| 1370 | else |
| 1371 | memcpy(&newserv[*nservers].addr.addrV6, &host.addrV6, |
| 1372 | sizeof(host.addrV6)); |
| 1373 | |
| 1374 | /* Update arguments. */ |
| 1375 | *servers = newserv; |
| 1376 | *nservers += 1; |
| 1377 | } |
| 1378 | |
| 1379 | return ARES_SUCCESS; |
| 1380 | } |
| 1381 | |
| 1382 | #ifndef WIN32 |
| 1383 | static int config_sortlist(struct apattern **sortlist, int *nsort, |
| 1384 | const char *str) |
| 1385 | { |
| 1386 | struct apattern pat; |
| 1387 | const char *q; |
| 1388 | |
| 1389 | /* Add sortlist entries. */ |
| 1390 | while (*str && *str != ';') |
| 1391 | { |
| 1392 | int bits; |
| 1393 | char ipbuf[16], ipbufpfx[32]; |
| 1394 | /* Find just the IP */ |
| 1395 | q = str; |
| 1396 | while (*q && *q != '/' && *q != ';' && !ISSPACE(*q)) |
| 1397 | q++; |
| 1398 | memcpy(ipbuf, str, q-str); |
| 1399 | ipbuf[q-str] = '\0'; |
| 1400 | /* Find the prefix */ |
| 1401 | if (*q == '/') |
| 1402 | { |
| 1403 | const char *str2 = q+1; |
| 1404 | while (*q && *q != ';' && !ISSPACE(*q)) |
| 1405 | q++; |
| 1406 | memcpy(ipbufpfx, str, q-str); |
| 1407 | ipbufpfx[q-str] = '\0'; |
| 1408 | str = str2; |
| 1409 | } |
| 1410 | else |
| 1411 | ipbufpfx[0] = '\0'; |
| 1412 | /* Lets see if it is CIDR */ |
| 1413 | /* First we'll try IPv6 */ |
| 1414 | if ((bits = ares_inet_net_pton(AF_INET6, ipbufpfx[0] ? ipbufpfx : ipbuf, |
| 1415 | &pat.addrV6, |
| 1416 | sizeof(pat.addrV6))) > 0) |
| 1417 | { |
| 1418 | pat.type = PATTERN_CIDR; |
| 1419 | pat.mask.bits = (unsigned short)bits; |
| 1420 | pat.family = AF_INET6; |
| 1421 | if (!sortlist_alloc(sortlist, nsort, &pat)) |
| 1422 | return ARES_ENOMEM; |
| 1423 | } |
| 1424 | else if (ipbufpfx[0] && |
| 1425 | (bits = ares_inet_net_pton(AF_INET, ipbufpfx, &pat.addrV4, |
| 1426 | sizeof(pat.addrV4))) > 0) |
| 1427 | { |
| 1428 | pat.type = PATTERN_CIDR; |
| 1429 | pat.mask.bits = (unsigned short)bits; |
| 1430 | pat.family = AF_INET; |
| 1431 | if (!sortlist_alloc(sortlist, nsort, &pat)) |
| 1432 | return ARES_ENOMEM; |
| 1433 | } |
| 1434 | /* See if it is just a regular IP */ |
| 1435 | else if (ip_addr(ipbuf, q-str, &pat.addrV4) == 0) |
| 1436 | { |
| 1437 | if (ipbufpfx[0]) |
| 1438 | { |
| 1439 | memcpy(ipbuf, str, q-str); |
| 1440 | ipbuf[q-str] = '\0'; |
| 1441 | if (ip_addr(ipbuf, q-str, &pat.mask.addr4) != 0) |
| 1442 | natural_mask(&pat); |
| 1443 | } |
| 1444 | else |
| 1445 | natural_mask(&pat); |
| 1446 | pat.family = AF_INET; |
| 1447 | pat.type = PATTERN_MASK; |
| 1448 | if (!sortlist_alloc(sortlist, nsort, &pat)) |
| 1449 | return ARES_ENOMEM; |
| 1450 | } |
| 1451 | else |
| 1452 | { |
| 1453 | while (*q && *q != ';' && !ISSPACE(*q)) |
| 1454 | q++; |
| 1455 | } |
| 1456 | str = q; |
| 1457 | while (ISSPACE(*str)) |
| 1458 | str++; |
| 1459 | } |
| 1460 | |
| 1461 | return ARES_SUCCESS; |
| 1462 | } |
| 1463 | #endif /* !WIN32 */ |
| 1464 | #endif /* !WATT32 */ |
| 1465 | |
| 1466 | static int set_search(ares_channel channel, const char *str) |
| 1467 | { |
| 1468 | int n; |
| 1469 | const char *p, *q; |
| 1470 | |
| 1471 | if(channel->ndomains != -1) { |
| 1472 | /* if we already have some domains present, free them first */ |
| 1473 | for(n=0; n < channel->ndomains; n++) |
| 1474 | free(channel->domains[n]); |
| 1475 | free(channel->domains); |
| 1476 | channel->domains = NULL; |
| 1477 | channel->ndomains = -1; |
| 1478 | } |
| 1479 | |
| 1480 | /* Count the domains given. */ |
| 1481 | n = 0; |
| 1482 | p = str; |
| 1483 | while (*p) |
| 1484 | { |
| 1485 | while (*p && !ISSPACE(*p)) |
| 1486 | p++; |
| 1487 | while (ISSPACE(*p)) |
| 1488 | p++; |
| 1489 | n++; |
| 1490 | } |
| 1491 | |
| 1492 | if (!n) |
| 1493 | { |
| 1494 | channel->ndomains = 0; |
| 1495 | return ARES_SUCCESS; |
| 1496 | } |
| 1497 | |
| 1498 | channel->domains = malloc(n * sizeof(char *)); |
| 1499 | if (!channel->domains) |
| 1500 | return ARES_ENOMEM; |
| 1501 | |
| 1502 | /* Now copy the domains. */ |
| 1503 | n = 0; |
| 1504 | p = str; |
| 1505 | while (*p) |
| 1506 | { |
| 1507 | channel->ndomains = n; |
| 1508 | q = p; |
| 1509 | while (*q && !ISSPACE(*q)) |
| 1510 | q++; |
| 1511 | channel->domains[n] = malloc(q - p + 1); |
| 1512 | if (!channel->domains[n]) |
| 1513 | return ARES_ENOMEM; |
| 1514 | memcpy(channel->domains[n], p, q - p); |
| 1515 | channel->domains[n][q - p] = 0; |
| 1516 | p = q; |
| 1517 | while (ISSPACE(*p)) |
| 1518 | p++; |
| 1519 | n++; |
| 1520 | } |
| 1521 | channel->ndomains = n; |
| 1522 | |
| 1523 | return ARES_SUCCESS; |
| 1524 | } |
| 1525 | |
| 1526 | static int set_options(ares_channel channel, const char *str) |
| 1527 | { |
| 1528 | const char *p, *q, *val; |
| 1529 | |
| 1530 | p = str; |
| 1531 | while (*p) |
| 1532 | { |
| 1533 | q = p; |
| 1534 | while (*q && !ISSPACE(*q)) |
| 1535 | q++; |
| 1536 | val = try_option(p, q, "ndots:"); |
| 1537 | if (val && channel->ndots == -1) |
| 1538 | channel->ndots = aresx_sltosi(strtol(val, NULL, 10)); |
| 1539 | val = try_option(p, q, "retrans:"); |
| 1540 | if (val && channel->timeout == -1) |
| 1541 | channel->timeout = aresx_sltosi(strtol(val, NULL, 10)); |
| 1542 | val = try_option(p, q, "retry:"); |
| 1543 | if (val && channel->tries == -1) |
| 1544 | channel->tries = aresx_sltosi(strtol(val, NULL, 10)); |
| 1545 | val = try_option(p, q, "rotate"); |
| 1546 | if (val && channel->rotate == -1) |
| 1547 | channel->rotate = 1; |
| 1548 | p = q; |
| 1549 | while (ISSPACE(*p)) |
| 1550 | p++; |
| 1551 | } |
| 1552 | |
| 1553 | return ARES_SUCCESS; |
| 1554 | } |
| 1555 | |
| 1556 | static const char *try_option(const char *p, const char *q, const char *opt) |
| 1557 | { |
| 1558 | size_t len = strlen(opt); |
| 1559 | return ((size_t)(q - p) >= len && !strncmp(p, opt, len)) ? &p[len] : NULL; |
| 1560 | } |
| 1561 | |
| 1562 | #if !defined(WIN32) && !defined(WATT32) |
| 1563 | static char *try_config(char *s, const char *opt, char scc) |
| 1564 | { |
| 1565 | size_t len; |
| 1566 | char *p; |
| 1567 | char *q; |
| 1568 | |
| 1569 | if (!s || !opt) |
| 1570 | /* no line or no option */ |
| 1571 | return NULL; |
| 1572 | |
| 1573 | /* Hash '#' character is always used as primary comment char, additionally |
| 1574 | a not-NUL secondary comment char will be considered when specified. */ |
| 1575 | |
| 1576 | /* trim line comment */ |
| 1577 | p = s; |
| 1578 | if(scc) |
| 1579 | while (*p && (*p != '#') && (*p != scc)) |
| 1580 | p++; |
| 1581 | else |
| 1582 | while (*p && (*p != '#')) |
| 1583 | p++; |
| 1584 | *p = '\0'; |
| 1585 | |
| 1586 | /* trim trailing whitespace */ |
| 1587 | q = p - 1; |
| 1588 | while ((q >= s) && ISSPACE(*q)) |
| 1589 | q--; |
| 1590 | *++q = '\0'; |
| 1591 | |
| 1592 | /* skip leading whitespace */ |
| 1593 | p = s; |
| 1594 | while (*p && ISSPACE(*p)) |
| 1595 | p++; |
| 1596 | |
| 1597 | if (!*p) |
| 1598 | /* empty line */ |
| 1599 | return NULL; |
| 1600 | |
| 1601 | if ((len = strlen(opt)) == 0) |
| 1602 | /* empty option */ |
| 1603 | return NULL; |
| 1604 | |
| 1605 | if (strncmp(p, opt, len) != 0) |
| 1606 | /* line and option do not match */ |
| 1607 | return NULL; |
| 1608 | |
| 1609 | /* skip over given option name */ |
| 1610 | p += len; |
| 1611 | |
| 1612 | if (!*p) |
| 1613 | /* no option value */ |
| 1614 | return NULL; |
| 1615 | |
| 1616 | if ((opt[len-1] != ':') && (opt[len-1] != '=') && !ISSPACE(*p)) |
| 1617 | /* whitespace between option name and value is mandatory |
| 1618 | for given option names which do not end with ':' or '=' */ |
| 1619 | return NULL; |
| 1620 | |
| 1621 | /* skip over whitespace */ |
| 1622 | while (*p && ISSPACE(*p)) |
| 1623 | p++; |
| 1624 | |
| 1625 | if (!*p) |
| 1626 | /* no option value */ |
| 1627 | return NULL; |
| 1628 | |
| 1629 | /* return pointer to option value */ |
| 1630 | return p; |
| 1631 | } |
| 1632 | |
| 1633 | static int sortlist_alloc(struct apattern **sortlist, int *nsort, |
| 1634 | struct apattern *pat) |
| 1635 | { |
| 1636 | struct apattern *newsort; |
| 1637 | newsort = realloc(*sortlist, (*nsort + 1) * sizeof(struct apattern)); |
| 1638 | if (!newsort) |
| 1639 | return 0; |
| 1640 | newsort[*nsort] = *pat; |
| 1641 | *sortlist = newsort; |
| 1642 | (*nsort)++; |
| 1643 | return 1; |
| 1644 | } |
| 1645 | |
| 1646 | static int ip_addr(const char *ipbuf, ssize_t len, struct in_addr *addr) |
| 1647 | { |
| 1648 | |
| 1649 | /* Four octets and three periods yields at most 15 characters. */ |
| 1650 | if (len > 15) |
| 1651 | return -1; |
| 1652 | |
| 1653 | addr->s_addr = inet_addr(ipbuf); |
| 1654 | if (addr->s_addr == INADDR_NONE && strcmp(ipbuf, "255.255.255.255") != 0) |
| 1655 | return -1; |
| 1656 | return 0; |
| 1657 | } |
| 1658 | |
| 1659 | static void natural_mask(struct apattern *pat) |
| 1660 | { |
| 1661 | struct in_addr addr; |
| 1662 | |
| 1663 | /* Store a host-byte-order copy of pat in a struct in_addr. Icky, |
| 1664 | * but portable. |
| 1665 | */ |
| 1666 | addr.s_addr = ntohl(pat->addrV4.s_addr); |
| 1667 | |
| 1668 | /* This is out of date in the CIDR world, but some people might |
| 1669 | * still rely on it. |
| 1670 | */ |
| 1671 | if (IN_CLASSA(addr.s_addr)) |
| 1672 | pat->mask.addr4.s_addr = htonl(IN_CLASSA_NET); |
| 1673 | else if (IN_CLASSB(addr.s_addr)) |
| 1674 | pat->mask.addr4.s_addr = htonl(IN_CLASSB_NET); |
| 1675 | else |
| 1676 | pat->mask.addr4.s_addr = htonl(IN_CLASSC_NET); |
| 1677 | } |
| 1678 | #endif /* !WIN32 && !WATT32 */ |
| 1679 | |
| 1680 | /* initialize an rc4 key. If possible a cryptographically secure random key |
| 1681 | is generated using a suitable function (for example win32's RtlGenRandom as |
| 1682 | described in |
| 1683 | http://blogs.msdn.com/michael_howard/archive/2005/01/14/353379.aspx |
| 1684 | otherwise the code defaults to cross-platform albeit less secure mechanism |
| 1685 | using rand |
| 1686 | */ |
| 1687 | static void randomize_key(unsigned char* key,int key_data_len) |
| 1688 | { |
| 1689 | int randomized = 0; |
| 1690 | int counter=0; |
| 1691 | #ifdef WIN32 |
| 1692 | BOOLEAN res; |
| 1693 | if (ares_fpSystemFunction036) |
| 1694 | { |
| 1695 | res = (*ares_fpSystemFunction036) (key, key_data_len); |
| 1696 | if (res) |
| 1697 | randomized = 1; |
| 1698 | } |
| 1699 | #else /* !WIN32 */ |
| 1700 | #ifdef RANDOM_FILE |
| 1701 | FILE *f = fopen(RANDOM_FILE, "rb"); |
| 1702 | if(f) { |
| 1703 | counter = aresx_uztosi(fread(key, 1, key_data_len, f)); |
| 1704 | fclose(f); |
| 1705 | } |
| 1706 | #endif |
| 1707 | #endif /* WIN32 */ |
| 1708 | |
| 1709 | if ( !randomized ) { |
| 1710 | for (;counter<key_data_len;counter++) |
| 1711 | key[counter]=(unsigned char)(rand() % 256); |
| 1712 | } |
| 1713 | } |
| 1714 | |
| 1715 | static int init_id_key(rc4_key* key,int key_data_len) |
| 1716 | { |
| 1717 | unsigned char index1; |
| 1718 | unsigned char index2; |
| 1719 | unsigned char* state; |
| 1720 | short counter; |
| 1721 | unsigned char *key_data_ptr = 0; |
| 1722 | |
| 1723 | key_data_ptr = calloc(1,key_data_len); |
| 1724 | if (!key_data_ptr) |
| 1725 | return ARES_ENOMEM; |
| 1726 | |
| 1727 | state = &key->state[0]; |
| 1728 | for(counter = 0; counter < 256; counter++) |
| 1729 | /* unnecessary AND but it keeps some compilers happier */ |
| 1730 | state[counter] = (unsigned char)(counter & 0xff); |
| 1731 | randomize_key(key->state,key_data_len); |
| 1732 | key->x = 0; |
| 1733 | key->y = 0; |
| 1734 | index1 = 0; |
| 1735 | index2 = 0; |
| 1736 | for(counter = 0; counter < 256; counter++) |
| 1737 | { |
| 1738 | index2 = (unsigned char)((key_data_ptr[index1] + state[counter] + |
| 1739 | index2) % 256); |
| 1740 | ARES_SWAP_BYTE(&state[counter], &state[index2]); |
| 1741 | |
| 1742 | index1 = (unsigned char)((index1 + 1) % key_data_len); |
| 1743 | } |
| 1744 | free(key_data_ptr); |
| 1745 | return ARES_SUCCESS; |
| 1746 | } |
| 1747 | |
| 1748 | unsigned short ares__generate_new_id(rc4_key* key) |
| 1749 | { |
| 1750 | unsigned short r=0; |
| 1751 | ares__rc4(key, (unsigned char *)&r, sizeof(r)); |
| 1752 | return r; |
| 1753 | } |
| 1754 | |
| 1755 | void ares_set_local_ip4(ares_channel channel, unsigned int local_ip) |
| 1756 | { |
| 1757 | channel->local_ip4 = local_ip; |
| 1758 | } |
| 1759 | |
| 1760 | /* local_ip6 should be 16 bytes in length */ |
| 1761 | void ares_set_local_ip6(ares_channel channel, |
| 1762 | const unsigned char* local_ip6) |
| 1763 | { |
| 1764 | memcpy(&channel->local_ip6, local_ip6, sizeof(channel->local_ip6)); |
| 1765 | } |
| 1766 | |
| 1767 | /* local_dev_name should be null terminated. */ |
| 1768 | void ares_set_local_dev(ares_channel channel, |
| 1769 | const char* local_dev_name) |
| 1770 | { |
| 1771 | strncpy(channel->local_dev_name, local_dev_name, |
| 1772 | sizeof(channel->local_dev_name)); |
| 1773 | channel->local_dev_name[sizeof(channel->local_dev_name) - 1] = 0; |
| 1774 | } |
| 1775 | |
| 1776 | |
| 1777 | void ares_set_socket_callback(ares_channel channel, |
| 1778 | ares_sock_create_callback cb, |
| 1779 | void *data) |
| 1780 | { |
| 1781 | channel->sock_create_cb = cb; |
| 1782 | channel->sock_create_cb_data = data; |
| 1783 | } |
| 1784 | |
| 1785 | void ares__init_servers_state(ares_channel channel) |
| 1786 | { |
| 1787 | struct server_state *server; |
| 1788 | int i; |
| 1789 | |
| 1790 | for (i = 0; i < channel->nservers; i++) |
| 1791 | { |
| 1792 | server = &channel->servers[i]; |
| 1793 | server->udp_socket = ARES_SOCKET_BAD; |
| 1794 | server->tcp_socket = ARES_SOCKET_BAD; |
| 1795 | server->tcp_connection_generation = ++channel->tcp_connection_generation; |
| 1796 | server->tcp_lenbuf_pos = 0; |
| 1797 | server->tcp_buffer_pos = 0; |
| 1798 | server->tcp_buffer = NULL; |
| 1799 | server->tcp_length = 0; |
| 1800 | server->qhead = NULL; |
| 1801 | server->qtail = NULL; |
| 1802 | ares__init_list_head(&server->queries_to_server); |
| 1803 | server->channel = channel; |
| 1804 | server->is_broken = 0; |
| 1805 | } |
| 1806 | } |