lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
| 2 | * |
| 3 | * |
| 4 | * Permission to use, copy, modify, and distribute this |
| 5 | * software and its documentation for any purpose and without |
| 6 | * fee is hereby granted, provided that the above copyright |
| 7 | * notice appear in all copies and that both that copyright |
| 8 | * notice and this permission notice appear in supporting |
| 9 | * documentation, and that the name of M.I.T. not be used in |
| 10 | * advertising or publicity pertaining to distribution of the |
| 11 | * software without specific, written prior permission. |
| 12 | * M.I.T. makes no representations about the suitability of |
| 13 | * this software for any purpose. It is provided "as is" |
| 14 | * without express or implied warranty. |
| 15 | */ |
| 16 | |
| 17 | #include "ares_setup.h" |
| 18 | |
| 19 | #ifdef HAVE_NETINET_IN_H |
| 20 | # include <netinet/in.h> |
| 21 | #endif |
| 22 | #ifdef HAVE_ARPA_INET_H |
| 23 | # include <arpa/inet.h> |
| 24 | #endif |
| 25 | #ifdef HAVE_NETDB_H |
| 26 | # include <netdb.h> |
| 27 | #endif |
| 28 | #ifdef HAVE_ARPA_NAMESER_H |
| 29 | # include <arpa/nameser.h> |
| 30 | #else |
| 31 | # include "nameser.h" |
| 32 | #endif |
| 33 | #ifdef HAVE_ARPA_NAMESER_COMPAT_H |
| 34 | # include <arpa/nameser_compat.h> |
| 35 | #endif |
| 36 | |
| 37 | #ifdef HAVE_STRINGS_H |
| 38 | # include <strings.h> |
| 39 | #endif |
| 40 | |
| 41 | #include "ares.h" |
| 42 | #include "ares_dns.h" |
| 43 | #include "ares_getopt.h" |
| 44 | #include "ares_nowarn.h" |
| 45 | |
| 46 | #ifndef HAVE_STRDUP |
| 47 | # include "ares_strdup.h" |
| 48 | # define strdup(ptr) ares_strdup(ptr) |
| 49 | #endif |
| 50 | |
| 51 | #ifndef HAVE_STRCASECMP |
| 52 | # include "ares_strcasecmp.h" |
| 53 | # define strcasecmp(p1,p2) ares_strcasecmp(p1,p2) |
| 54 | #endif |
| 55 | |
| 56 | #ifndef HAVE_STRNCASECMP |
| 57 | # include "ares_strcasecmp.h" |
| 58 | # define strncasecmp(p1,p2,n) ares_strncasecmp(p1,p2,n) |
| 59 | #endif |
| 60 | |
| 61 | #ifdef WATT32 |
| 62 | #undef WIN32 /* Redefined in MingW headers */ |
| 63 | #endif |
| 64 | |
| 65 | #ifndef T_SRV |
| 66 | # define T_SRV 33 /* Server selection */ |
| 67 | #endif |
| 68 | #ifndef T_NAPTR |
| 69 | # define T_NAPTR 35 /* Naming authority pointer */ |
| 70 | #endif |
| 71 | #ifndef T_DS |
| 72 | # define T_DS 43 /* Delegation Signer (RFC4034) */ |
| 73 | #endif |
| 74 | #ifndef T_SSHFP |
| 75 | # define T_SSHFP 44 /* SSH Key Fingerprint (RFC4255) */ |
| 76 | #endif |
| 77 | #ifndef T_RRSIG |
| 78 | # define T_RRSIG 46 /* Resource Record Signature (RFC4034) */ |
| 79 | #endif |
| 80 | #ifndef T_NSEC |
| 81 | # define T_NSEC 47 /* Next Secure (RFC4034) */ |
| 82 | #endif |
| 83 | #ifndef T_DNSKEY |
| 84 | # define T_DNSKEY 48 /* DNS Public Key (RFC4034) */ |
| 85 | #endif |
| 86 | |
| 87 | struct nv { |
| 88 | const char *name; |
| 89 | int value; |
| 90 | }; |
| 91 | |
| 92 | static const struct nv flags[] = { |
| 93 | { "usevc", ARES_FLAG_USEVC }, |
| 94 | { "primary", ARES_FLAG_PRIMARY }, |
| 95 | { "igntc", ARES_FLAG_IGNTC }, |
| 96 | { "norecurse", ARES_FLAG_NORECURSE }, |
| 97 | { "stayopen", ARES_FLAG_STAYOPEN }, |
| 98 | { "noaliases", ARES_FLAG_NOALIASES } |
| 99 | }; |
| 100 | static const int nflags = sizeof(flags) / sizeof(flags[0]); |
| 101 | |
| 102 | static const struct nv classes[] = { |
| 103 | { "IN", C_IN }, |
| 104 | { "CHAOS", C_CHAOS }, |
| 105 | { "HS", C_HS }, |
| 106 | { "ANY", C_ANY } |
| 107 | }; |
| 108 | static const int nclasses = sizeof(classes) / sizeof(classes[0]); |
| 109 | |
| 110 | static const struct nv types[] = { |
| 111 | { "A", T_A }, |
| 112 | { "NS", T_NS }, |
| 113 | { "MD", T_MD }, |
| 114 | { "MF", T_MF }, |
| 115 | { "CNAME", T_CNAME }, |
| 116 | { "SOA", T_SOA }, |
| 117 | { "MB", T_MB }, |
| 118 | { "MG", T_MG }, |
| 119 | { "MR", T_MR }, |
| 120 | { "NULL", T_NULL }, |
| 121 | { "WKS", T_WKS }, |
| 122 | { "PTR", T_PTR }, |
| 123 | { "HINFO", T_HINFO }, |
| 124 | { "MINFO", T_MINFO }, |
| 125 | { "MX", T_MX }, |
| 126 | { "TXT", T_TXT }, |
| 127 | { "RP", T_RP }, |
| 128 | { "AFSDB", T_AFSDB }, |
| 129 | { "X25", T_X25 }, |
| 130 | { "ISDN", T_ISDN }, |
| 131 | { "RT", T_RT }, |
| 132 | { "NSAP", T_NSAP }, |
| 133 | { "NSAP_PTR", T_NSAP_PTR }, |
| 134 | { "SIG", T_SIG }, |
| 135 | { "KEY", T_KEY }, |
| 136 | { "PX", T_PX }, |
| 137 | { "GPOS", T_GPOS }, |
| 138 | { "AAAA", T_AAAA }, |
| 139 | { "LOC", T_LOC }, |
| 140 | { "SRV", T_SRV }, |
| 141 | { "AXFR", T_AXFR }, |
| 142 | { "MAILB", T_MAILB }, |
| 143 | { "MAILA", T_MAILA }, |
| 144 | { "NAPTR", T_NAPTR }, |
| 145 | { "DS", T_DS }, |
| 146 | { "SSHFP", T_SSHFP }, |
| 147 | { "RRSIG", T_RRSIG }, |
| 148 | { "NSEC", T_NSEC }, |
| 149 | { "DNSKEY", T_DNSKEY }, |
| 150 | { "ANY", T_ANY } |
| 151 | }; |
| 152 | static const int ntypes = sizeof(types) / sizeof(types[0]); |
| 153 | |
| 154 | static const char *opcodes[] = { |
| 155 | "QUERY", "IQUERY", "STATUS", "(reserved)", "NOTIFY", |
| 156 | "(unknown)", "(unknown)", "(unknown)", "(unknown)", |
| 157 | "UPDATEA", "UPDATED", "UPDATEDA", "UPDATEM", "UPDATEMA", |
| 158 | "ZONEINIT", "ZONEREF" |
| 159 | }; |
| 160 | |
| 161 | static const char *rcodes[] = { |
| 162 | "NOERROR", "FORMERR", "SERVFAIL", "NXDOMAIN", "NOTIMP", "REFUSED", |
| 163 | "(unknown)", "(unknown)", "(unknown)", "(unknown)", "(unknown)", |
| 164 | "(unknown)", "(unknown)", "(unknown)", "(unknown)", "NOCHANGE" |
| 165 | }; |
| 166 | |
| 167 | static void callback(void *arg, int status, int timeouts, |
| 168 | unsigned char *abuf, int alen); |
| 169 | static const unsigned char *display_question(const unsigned char *aptr, |
| 170 | const unsigned char *abuf, |
| 171 | int alen); |
| 172 | static const unsigned char *display_rr(const unsigned char *aptr, |
| 173 | const unsigned char *abuf, int alen); |
| 174 | static const char *type_name(int type); |
| 175 | static const char *class_name(int dnsclass); |
| 176 | static void usage(void); |
| 177 | static void destroy_addr_list(struct ares_addr_node *head); |
| 178 | static void append_addr_list(struct ares_addr_node **head, |
| 179 | struct ares_addr_node *node); |
| 180 | int main(int argc, char **argv) |
| 181 | { |
| 182 | ares_channel channel; |
| 183 | int c, i, optmask = ARES_OPT_FLAGS, dnsclass = C_IN, type = T_A; |
| 184 | int status, nfds, count; |
| 185 | struct ares_options options; |
| 186 | struct hostent *hostent; |
| 187 | fd_set read_fds, write_fds; |
| 188 | struct timeval *tvp, tv; |
| 189 | struct ares_addr_node *srvr, *servers = NULL; |
| 190 | char * ares_dev = NULL; |
| 191 | #ifdef USE_WINSOCK |
| 192 | WORD wVersionRequested = MAKEWORD(USE_WINSOCK,USE_WINSOCK); |
| 193 | WSADATA wsaData; |
| 194 | WSAStartup(wVersionRequested, &wsaData); |
| 195 | #endif |
| 196 | |
| 197 | status = ares_library_init(ARES_LIB_INIT_ALL); |
| 198 | if (status != ARES_SUCCESS) |
| 199 | { |
| 200 | fprintf(stderr, "ares_library_init: %s\n", ares_strerror(status)); |
| 201 | return 1; |
| 202 | } |
| 203 | |
| 204 | options.flags = ARES_FLAG_NOCHECKRESP; |
| 205 | options.servers = NULL; |
| 206 | options.nservers = 0; |
| 207 | while ((c = ares_getopt(argc, argv, "df:s:c:t:T:U:i:")) != -1) |
| 208 | { |
| 209 | switch (c) |
| 210 | { |
| 211 | case 'd': |
| 212 | #ifdef WATT32 |
| 213 | dbug_init(); |
| 214 | #endif |
| 215 | break; |
| 216 | |
| 217 | case 'f': |
| 218 | /* Add a flag. */ |
| 219 | for (i = 0; i < nflags; i++) |
| 220 | { |
| 221 | if (strcmp(flags[i].name, optarg) == 0) |
| 222 | break; |
| 223 | } |
| 224 | if (i < nflags) |
| 225 | options.flags |= flags[i].value; |
| 226 | else |
| 227 | usage(); |
| 228 | break; |
| 229 | #if 1 |
| 230 | case 'i': |
| 231 | |
| 232 | ares_dev = (char * )strdup(optarg); |
| 233 | fprintf(stderr, "ares_dev is %s\n", ares_dev); |
| 234 | break; |
| 235 | #endif |
| 236 | case 's': |
| 237 | /* User-specified name servers override default ones. */ |
| 238 | srvr = malloc(sizeof(struct ares_addr_node)); |
| 239 | if (!srvr) |
| 240 | { |
| 241 | fprintf(stderr, "Out of memory!\n"); |
| 242 | destroy_addr_list(servers); |
| 243 | return 1; |
| 244 | } |
| 245 | append_addr_list(&servers, srvr); |
| 246 | if (ares_inet_pton(AF_INET, optarg, &srvr->addr.addr4) > 0) |
| 247 | srvr->family = AF_INET; |
| 248 | else if (ares_inet_pton(AF_INET6, optarg, &srvr->addr.addr6) > 0) |
| 249 | srvr->family = AF_INET6; |
| 250 | else |
| 251 | { |
| 252 | hostent = gethostbyname(optarg); |
| 253 | if (!hostent) |
| 254 | { |
| 255 | fprintf(stderr, "adig: server %s not found.\n", optarg); |
| 256 | destroy_addr_list(servers); |
| 257 | return 1; |
| 258 | } |
| 259 | switch (hostent->h_addrtype) |
| 260 | { |
| 261 | case AF_INET: |
| 262 | srvr->family = AF_INET; |
| 263 | memcpy(&srvr->addr.addr4, hostent->h_addr, |
| 264 | sizeof(srvr->addr.addr4)); |
| 265 | break; |
| 266 | case AF_INET6: |
| 267 | srvr->family = AF_INET6; |
| 268 | memcpy(&srvr->addr.addr6, hostent->h_addr, |
| 269 | sizeof(srvr->addr.addr6)); |
| 270 | break; |
| 271 | default: |
| 272 | fprintf(stderr, |
| 273 | "adig: server %s unsupported address family.\n", optarg); |
| 274 | destroy_addr_list(servers); |
| 275 | return 1; |
| 276 | } |
| 277 | } |
| 278 | /* Notice that calling ares_init_options() without servers in the |
| 279 | * options struct and with ARES_OPT_SERVERS set simultaneously in |
| 280 | * the options mask, results in an initialization with no servers. |
| 281 | * When alternative name servers have been specified these are set |
| 282 | * later calling ares_set_servers() overriding any existing server |
| 283 | * configuration. To prevent initial configuration with default |
| 284 | * servers that will be discarded later, ARES_OPT_SERVERS is set. |
| 285 | * If this flag is not set here the result shall be the same but |
| 286 | * ares_init_options() will do needless work. */ |
| 287 | optmask |= ARES_OPT_SERVERS; |
| 288 | break; |
| 289 | |
| 290 | case 'c': |
| 291 | /* Set the query class. */ |
| 292 | for (i = 0; i < nclasses; i++) |
| 293 | { |
| 294 | if (strcasecmp(classes[i].name, optarg) == 0) |
| 295 | break; |
| 296 | } |
| 297 | if (i < nclasses) |
| 298 | dnsclass = classes[i].value; |
| 299 | else |
| 300 | usage(); |
| 301 | break; |
| 302 | |
| 303 | case 't': |
| 304 | /* Set the query type. */ |
| 305 | for (i = 0; i < ntypes; i++) |
| 306 | { |
| 307 | if (strcasecmp(types[i].name, optarg) == 0) |
| 308 | break; |
| 309 | } |
| 310 | if (i < ntypes) |
| 311 | type = types[i].value; |
| 312 | else |
| 313 | usage(); |
| 314 | break; |
| 315 | |
| 316 | case 'T': |
| 317 | /* Set the TCP port number. */ |
| 318 | if (!ISDIGIT(*optarg)) |
| 319 | usage(); |
| 320 | options.tcp_port = (unsigned short)strtol(optarg, NULL, 0); |
| 321 | optmask |= ARES_OPT_TCP_PORT; |
| 322 | break; |
| 323 | |
| 324 | case 'U': |
| 325 | /* Set the UDP port number. */ |
| 326 | if (!ISDIGIT(*optarg)) |
| 327 | usage(); |
| 328 | options.udp_port = (unsigned short)strtol(optarg, NULL, 0); |
| 329 | optmask |= ARES_OPT_UDP_PORT; |
| 330 | break; |
| 331 | } |
| 332 | } |
| 333 | argc -= optind; |
| 334 | argv += optind; |
| 335 | if (argc == 0) |
| 336 | usage(); |
| 337 | |
| 338 | status = ares_init_options(&channel, &options, optmask, ares_dev); |
| 339 | |
| 340 | if (status != ARES_SUCCESS) |
| 341 | { |
| 342 | fprintf(stderr, "ares_init_options: %s\n", |
| 343 | ares_strerror(status)); |
| 344 | return 1; |
| 345 | } |
| 346 | |
| 347 | if(servers) |
| 348 | { |
| 349 | status = ares_set_servers(channel, servers); |
| 350 | destroy_addr_list(servers); |
| 351 | if (status != ARES_SUCCESS) |
| 352 | { |
| 353 | fprintf(stderr, "ares_init_options: %s\n", |
| 354 | ares_strerror(status)); |
| 355 | return 1; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /* Initiate the queries, one per command-line argument. If there is |
| 360 | * only one query to do, supply NULL as the callback argument; |
| 361 | * otherwise, supply the query name as an argument so we can |
| 362 | * distinguish responses for the user when printing them out. |
| 363 | */ |
| 364 | if (argc == 1) |
| 365 | ares_query(channel, *argv, dnsclass, type, callback, (char *) NULL); |
| 366 | else |
| 367 | { |
| 368 | for (; *argv; argv++) |
| 369 | ares_query(channel, *argv, dnsclass, type, callback, *argv); |
| 370 | } |
| 371 | |
| 372 | /* Wait for all queries to complete. */ |
| 373 | for (;;) |
| 374 | { |
| 375 | FD_ZERO(&read_fds); |
| 376 | FD_ZERO(&write_fds); |
| 377 | nfds = ares_fds(channel, &read_fds, &write_fds); |
| 378 | if (nfds == 0) |
| 379 | break; |
| 380 | tvp = ares_timeout(channel, NULL, &tv); |
| 381 | count = select(nfds, &read_fds, &write_fds, NULL, tvp); |
| 382 | if (count < 0 && (status = SOCKERRNO) != EINVAL) |
| 383 | { |
| 384 | printf("select fail: %d", status); |
| 385 | return 1; |
| 386 | } |
| 387 | ares_process(channel, &read_fds, &write_fds); |
| 388 | } |
| 389 | |
| 390 | ares_destroy(channel); |
| 391 | |
| 392 | ares_library_cleanup(); |
| 393 | |
| 394 | #ifdef USE_WINSOCK |
| 395 | WSACleanup(); |
| 396 | #endif |
| 397 | |
| 398 | return 0; |
| 399 | } |
| 400 | |
| 401 | static void callback(void *arg, int status, int timeouts, |
| 402 | unsigned char *abuf, int alen) |
| 403 | { |
| 404 | char *name = (char *) arg; |
| 405 | int id, qr, opcode, aa, tc, rd, ra, rcode; |
| 406 | unsigned int qdcount, ancount, nscount, arcount, i; |
| 407 | const unsigned char *aptr; |
| 408 | |
| 409 | (void) timeouts; |
| 410 | |
| 411 | /* Display the query name if given. */ |
| 412 | if (name) |
| 413 | printf("Answer for query %s:\n", name); |
| 414 | |
| 415 | /* Display an error message if there was an error, but only stop if |
| 416 | * we actually didn't get an answer buffer. |
| 417 | */ |
| 418 | if (status != ARES_SUCCESS) |
| 419 | { |
| 420 | printf("%s\n", ares_strerror(status)); |
| 421 | if (!abuf) |
| 422 | return; |
| 423 | } |
| 424 | |
| 425 | /* Won't happen, but check anyway, for safety. */ |
| 426 | if (alen < HFIXEDSZ) |
| 427 | return; |
| 428 | |
| 429 | /* Parse the answer header. */ |
| 430 | id = DNS_HEADER_QID(abuf); |
| 431 | qr = DNS_HEADER_QR(abuf); |
| 432 | opcode = DNS_HEADER_OPCODE(abuf); |
| 433 | aa = DNS_HEADER_AA(abuf); |
| 434 | tc = DNS_HEADER_TC(abuf); |
| 435 | rd = DNS_HEADER_RD(abuf); |
| 436 | ra = DNS_HEADER_RA(abuf); |
| 437 | rcode = DNS_HEADER_RCODE(abuf); |
| 438 | qdcount = DNS_HEADER_QDCOUNT(abuf); |
| 439 | ancount = DNS_HEADER_ANCOUNT(abuf); |
| 440 | nscount = DNS_HEADER_NSCOUNT(abuf); |
| 441 | arcount = DNS_HEADER_ARCOUNT(abuf); |
| 442 | |
| 443 | /* Display the answer header. */ |
| 444 | printf("id: %d\n", id); |
| 445 | printf("flags: %s%s%s%s%s\n", |
| 446 | qr ? "qr " : "", |
| 447 | aa ? "aa " : "", |
| 448 | tc ? "tc " : "", |
| 449 | rd ? "rd " : "", |
| 450 | ra ? "ra " : ""); |
| 451 | printf("opcode: %s\n", opcodes[opcode]); |
| 452 | printf("rcode: %s\n", rcodes[rcode]); |
| 453 | |
| 454 | /* Display the questions. */ |
| 455 | printf("Questions:\n"); |
| 456 | aptr = abuf + HFIXEDSZ; |
| 457 | for (i = 0; i < qdcount; i++) |
| 458 | { |
| 459 | aptr = display_question(aptr, abuf, alen); |
| 460 | if (aptr == NULL) |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | /* Display the answers. */ |
| 465 | printf("Answers:\n"); |
| 466 | for (i = 0; i < ancount; i++) |
| 467 | { |
| 468 | aptr = display_rr(aptr, abuf, alen); |
| 469 | if (aptr == NULL) |
| 470 | return; |
| 471 | } |
| 472 | |
| 473 | /* Display the NS records. */ |
| 474 | printf("NS records:\n"); |
| 475 | for (i = 0; i < nscount; i++) |
| 476 | { |
| 477 | aptr = display_rr(aptr, abuf, alen); |
| 478 | if (aptr == NULL) |
| 479 | return; |
| 480 | } |
| 481 | |
| 482 | /* Display the additional records. */ |
| 483 | printf("Additional records:\n"); |
| 484 | for (i = 0; i < arcount; i++) |
| 485 | { |
| 486 | aptr = display_rr(aptr, abuf, alen); |
| 487 | if (aptr == NULL) |
| 488 | return; |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | static const unsigned char *display_question(const unsigned char *aptr, |
| 493 | const unsigned char *abuf, |
| 494 | int alen) |
| 495 | { |
| 496 | char *name; |
| 497 | int type, dnsclass, status; |
| 498 | long len; |
| 499 | |
| 500 | /* Parse the question name. */ |
| 501 | status = ares_expand_name(aptr, abuf, alen, &name, &len); |
| 502 | if (status != ARES_SUCCESS) |
| 503 | return NULL; |
| 504 | aptr += len; |
| 505 | |
| 506 | /* Make sure there's enough data after the name for the fixed part |
| 507 | * of the question. |
| 508 | */ |
| 509 | if (aptr + QFIXEDSZ > abuf + alen) |
| 510 | { |
| 511 | ares_free_string(name); |
| 512 | return NULL; |
| 513 | } |
| 514 | |
| 515 | /* Parse the question type and class. */ |
| 516 | type = DNS_QUESTION_TYPE(aptr); |
| 517 | dnsclass = DNS_QUESTION_CLASS(aptr); |
| 518 | aptr += QFIXEDSZ; |
| 519 | |
| 520 | /* Display the question, in a format sort of similar to how we will |
| 521 | * display RRs. |
| 522 | */ |
| 523 | printf("\t%-15s.\t", name); |
| 524 | if (dnsclass != C_IN) |
| 525 | printf("\t%s", class_name(dnsclass)); |
| 526 | printf("\t%s\n", type_name(type)); |
| 527 | ares_free_string(name); |
| 528 | return aptr; |
| 529 | } |
| 530 | |
| 531 | static const unsigned char *display_rr(const unsigned char *aptr, |
| 532 | const unsigned char *abuf, int alen) |
| 533 | { |
| 534 | const unsigned char *p; |
| 535 | int type, dnsclass, ttl, dlen, status; |
| 536 | long len; |
| 537 | char addr[46]; |
| 538 | union { |
| 539 | unsigned char * as_uchar; |
| 540 | char * as_char; |
| 541 | } name; |
| 542 | |
| 543 | /* Parse the RR name. */ |
| 544 | status = ares_expand_name(aptr, abuf, alen, &name.as_char, &len); |
| 545 | if (status != ARES_SUCCESS) |
| 546 | return NULL; |
| 547 | aptr += len; |
| 548 | |
| 549 | /* Make sure there is enough data after the RR name for the fixed |
| 550 | * part of the RR. |
| 551 | */ |
| 552 | if (aptr + RRFIXEDSZ > abuf + alen) |
| 553 | { |
| 554 | ares_free_string(name.as_char); |
| 555 | return NULL; |
| 556 | } |
| 557 | |
| 558 | /* Parse the fixed part of the RR, and advance to the RR data |
| 559 | * field. */ |
| 560 | type = DNS_RR_TYPE(aptr); |
| 561 | dnsclass = DNS_RR_CLASS(aptr); |
| 562 | ttl = DNS_RR_TTL(aptr); |
| 563 | dlen = DNS_RR_LEN(aptr); |
| 564 | aptr += RRFIXEDSZ; |
| 565 | if (aptr + dlen > abuf + alen) |
| 566 | { |
| 567 | ares_free_string(name.as_char); |
| 568 | return NULL; |
| 569 | } |
| 570 | |
| 571 | /* Display the RR name, class, and type. */ |
| 572 | printf("\t%-15s.\t%d", name.as_char, ttl); |
| 573 | if (dnsclass != C_IN) |
| 574 | printf("\t%s", class_name(dnsclass)); |
| 575 | printf("\t%s", type_name(type)); |
| 576 | ares_free_string(name.as_char); |
| 577 | |
| 578 | /* Display the RR data. Don't touch aptr. */ |
| 579 | switch (type) |
| 580 | { |
| 581 | case T_CNAME: |
| 582 | case T_MB: |
| 583 | case T_MD: |
| 584 | case T_MF: |
| 585 | case T_MG: |
| 586 | case T_MR: |
| 587 | case T_NS: |
| 588 | case T_PTR: |
| 589 | /* For these types, the RR data is just a domain name. */ |
| 590 | status = ares_expand_name(aptr, abuf, alen, &name.as_char, &len); |
| 591 | if (status != ARES_SUCCESS) |
| 592 | return NULL; |
| 593 | printf("\t%s.", name.as_char); |
| 594 | ares_free_string(name.as_char); |
| 595 | break; |
| 596 | |
| 597 | case T_HINFO: |
| 598 | /* The RR data is two length-counted character strings. */ |
| 599 | p = aptr; |
| 600 | len = *p; |
| 601 | if (p + len + 1 > aptr + dlen) |
| 602 | return NULL; |
| 603 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 604 | if (status != ARES_SUCCESS) |
| 605 | return NULL; |
| 606 | printf("\t%s", name.as_char); |
| 607 | ares_free_string(name.as_char); |
| 608 | p += len; |
| 609 | len = *p; |
| 610 | if (p + len + 1 > aptr + dlen) |
| 611 | return NULL; |
| 612 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 613 | if (status != ARES_SUCCESS) |
| 614 | return NULL; |
| 615 | printf("\t%s", name.as_char); |
| 616 | ares_free_string(name.as_char); |
| 617 | break; |
| 618 | |
| 619 | case T_MINFO: |
| 620 | /* The RR data is two domain names. */ |
| 621 | p = aptr; |
| 622 | status = ares_expand_name(p, abuf, alen, &name.as_char, &len); |
| 623 | if (status != ARES_SUCCESS) |
| 624 | return NULL; |
| 625 | printf("\t%s.", name.as_char); |
| 626 | ares_free_string(name.as_char); |
| 627 | p += len; |
| 628 | status = ares_expand_name(p, abuf, alen, &name.as_char, &len); |
| 629 | if (status != ARES_SUCCESS) |
| 630 | return NULL; |
| 631 | printf("\t%s.", name.as_char); |
| 632 | ares_free_string(name.as_char); |
| 633 | break; |
| 634 | |
| 635 | case T_MX: |
| 636 | /* The RR data is two bytes giving a preference ordering, and |
| 637 | * then a domain name. |
| 638 | */ |
| 639 | if (dlen < 2) |
| 640 | return NULL; |
| 641 | printf("\t%d", (int)DNS__16BIT(aptr)); |
| 642 | status = ares_expand_name(aptr + 2, abuf, alen, &name.as_char, &len); |
| 643 | if (status != ARES_SUCCESS) |
| 644 | return NULL; |
| 645 | printf("\t%s.", name.as_char); |
| 646 | ares_free_string(name.as_char); |
| 647 | break; |
| 648 | |
| 649 | case T_SOA: |
| 650 | /* The RR data is two domain names and then five four-byte |
| 651 | * numbers giving the serial number and some timeouts. |
| 652 | */ |
| 653 | p = aptr; |
| 654 | status = ares_expand_name(p, abuf, alen, &name.as_char, &len); |
| 655 | if (status != ARES_SUCCESS) |
| 656 | return NULL; |
| 657 | printf("\t%s.\n", name.as_char); |
| 658 | ares_free_string(name.as_char); |
| 659 | p += len; |
| 660 | status = ares_expand_name(p, abuf, alen, &name.as_char, &len); |
| 661 | if (status != ARES_SUCCESS) |
| 662 | return NULL; |
| 663 | printf("\t\t\t\t\t\t%s.\n", name.as_char); |
| 664 | ares_free_string(name.as_char); |
| 665 | p += len; |
| 666 | if (p + 20 > aptr + dlen) |
| 667 | return NULL; |
| 668 | printf("\t\t\t\t\t\t( %u %u %u %u %u )", |
| 669 | DNS__32BIT(p), DNS__32BIT(p+4), |
| 670 | DNS__32BIT(p+8), DNS__32BIT(p+12), |
| 671 | DNS__32BIT(p+16)); |
| 672 | break; |
| 673 | |
| 674 | case T_TXT: |
| 675 | /* The RR data is one or more length-counted character |
| 676 | * strings. */ |
| 677 | p = aptr; |
| 678 | while (p < aptr + dlen) |
| 679 | { |
| 680 | len = *p; |
| 681 | if (p + len + 1 > aptr + dlen) |
| 682 | return NULL; |
| 683 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 684 | if (status != ARES_SUCCESS) |
| 685 | return NULL; |
| 686 | printf("\t%s", name.as_char); |
| 687 | ares_free_string(name.as_char); |
| 688 | p += len; |
| 689 | } |
| 690 | break; |
| 691 | |
| 692 | case T_A: |
| 693 | /* The RR data is a four-byte Internet address. */ |
| 694 | if (dlen != 4) |
| 695 | return NULL; |
| 696 | printf("\t%s", ares_inet_ntop(AF_INET,aptr,addr,sizeof(addr))); |
| 697 | break; |
| 698 | |
| 699 | case T_AAAA: |
| 700 | /* The RR data is a 16-byte IPv6 address. */ |
| 701 | if (dlen != 16) |
| 702 | return NULL; |
| 703 | printf("\t%s", ares_inet_ntop(AF_INET6,aptr,addr,sizeof(addr))); |
| 704 | break; |
| 705 | |
| 706 | case T_WKS: |
| 707 | /* Not implemented yet */ |
| 708 | break; |
| 709 | |
| 710 | case T_SRV: |
| 711 | /* The RR data is three two-byte numbers representing the |
| 712 | * priority, weight, and port, followed by a domain name. |
| 713 | */ |
| 714 | |
| 715 | printf("\t%d", (int)DNS__16BIT(aptr)); |
| 716 | printf(" %d", (int)DNS__16BIT(aptr + 2)); |
| 717 | printf(" %d", (int)DNS__16BIT(aptr + 4)); |
| 718 | |
| 719 | status = ares_expand_name(aptr + 6, abuf, alen, &name.as_char, &len); |
| 720 | if (status != ARES_SUCCESS) |
| 721 | return NULL; |
| 722 | printf("\t%s.", name.as_char); |
| 723 | ares_free_string(name.as_char); |
| 724 | break; |
| 725 | |
| 726 | case T_NAPTR: |
| 727 | |
| 728 | printf("\t%d", (int)DNS__16BIT(aptr)); /* order */ |
| 729 | printf(" %d\n", (int)DNS__16BIT(aptr + 2)); /* preference */ |
| 730 | |
| 731 | p = aptr + 4; |
| 732 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 733 | if (status != ARES_SUCCESS) |
| 734 | return NULL; |
| 735 | printf("\t\t\t\t\t\t%s\n", name.as_char); |
| 736 | ares_free_string(name.as_char); |
| 737 | p += len; |
| 738 | |
| 739 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 740 | if (status != ARES_SUCCESS) |
| 741 | return NULL; |
| 742 | printf("\t\t\t\t\t\t%s\n", name.as_char); |
| 743 | ares_free_string(name.as_char); |
| 744 | p += len; |
| 745 | |
| 746 | status = ares_expand_string(p, abuf, alen, &name.as_uchar, &len); |
| 747 | if (status != ARES_SUCCESS) |
| 748 | return NULL; |
| 749 | printf("\t\t\t\t\t\t%s\n", name.as_char); |
| 750 | ares_free_string(name.as_char); |
| 751 | p += len; |
| 752 | |
| 753 | status = ares_expand_name(p, abuf, alen, &name.as_char, &len); |
| 754 | if (status != ARES_SUCCESS) |
| 755 | return NULL; |
| 756 | printf("\t\t\t\t\t\t%s", name.as_char); |
| 757 | ares_free_string(name.as_char); |
| 758 | break; |
| 759 | |
| 760 | case T_DS: |
| 761 | case T_SSHFP: |
| 762 | case T_RRSIG: |
| 763 | case T_NSEC: |
| 764 | case T_DNSKEY: |
| 765 | printf("\t[RR type parsing unavailable]"); |
| 766 | break; |
| 767 | |
| 768 | default: |
| 769 | printf("\t[Unknown RR; cannot parse]"); |
| 770 | break; |
| 771 | } |
| 772 | printf("\n"); |
| 773 | |
| 774 | return aptr + dlen; |
| 775 | } |
| 776 | |
| 777 | static const char *type_name(int type) |
| 778 | { |
| 779 | int i; |
| 780 | |
| 781 | for (i = 0; i < ntypes; i++) |
| 782 | { |
| 783 | if (types[i].value == type) |
| 784 | return types[i].name; |
| 785 | } |
| 786 | return "(unknown)"; |
| 787 | } |
| 788 | |
| 789 | static const char *class_name(int dnsclass) |
| 790 | { |
| 791 | int i; |
| 792 | |
| 793 | for (i = 0; i < nclasses; i++) |
| 794 | { |
| 795 | if (classes[i].value == dnsclass) |
| 796 | return classes[i].name; |
| 797 | } |
| 798 | return "(unknown)"; |
| 799 | } |
| 800 | |
| 801 | static void usage(void) |
| 802 | { |
| 803 | fprintf(stderr, "usage: adig [-f flag] [-s server] [-c class] " |
| 804 | "[-t type] [-p port] name ...\n"); |
| 805 | exit(1); |
| 806 | } |
| 807 | |
| 808 | static void destroy_addr_list(struct ares_addr_node *head) |
| 809 | { |
| 810 | while(head) |
| 811 | { |
| 812 | struct ares_addr_node *detached = head; |
| 813 | head = head->next; |
| 814 | free(detached); |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | static void append_addr_list(struct ares_addr_node **head, |
| 819 | struct ares_addr_node *node) |
| 820 | { |
| 821 | struct ares_addr_node *last; |
| 822 | node->next = NULL; |
| 823 | if(*head) |
| 824 | { |
| 825 | last = *head; |
| 826 | while(last->next) |
| 827 | last = last->next; |
| 828 | last->next = node; |
| 829 | } |
| 830 | else |
| 831 | *head = node; |
| 832 | } |
| 833 | |
| 834 | int compat_gethostbyname2(const char *name ,const char *dev_name, int family) |
| 835 | { |
| 836 | ares_channel channel; |
| 837 | struct ares_options options; |
| 838 | int optmask = ARES_OPT_FLAGS, dnsclass = C_IN, type = T_A; |
| 839 | fd_set read_fds, write_fds; |
| 840 | int status, nfds, count; |
| 841 | struct timeval *tvp, tv; |
| 842 | |
| 843 | #ifdef USE_WINSOCK |
| 844 | WORD wVersionRequested = MAKEWORD(USE_WINSOCK,USE_WINSOCK); |
| 845 | WSADATA wsaData; |
| 846 | WSAStartup(wVersionRequested, &wsaData); |
| 847 | #endif |
| 848 | if (family == AF_INET) |
| 849 | type = T_A; |
| 850 | else if (family == AF_INET6) |
| 851 | type = T_AAAA; |
| 852 | options.flags = ARES_FLAG_NOCHECKRESP; |
| 853 | options.servers = NULL; |
| 854 | options.nservers = 0; |
| 855 | status = ares_init_options(&channel, &options, optmask, dev_name); |
| 856 | if (status != ARES_SUCCESS) |
| 857 | { |
| 858 | fprintf(stderr, "ares_init_options: %s\n", |
| 859 | ares_strerror(status)); |
| 860 | return 1; |
| 861 | } |
| 862 | ares_query(channel, name, dnsclass, type, callback, NULL); /* Wait for all queries to complete. */ |
| 863 | for (;;) |
| 864 | { |
| 865 | FD_ZERO(&read_fds); |
| 866 | FD_ZERO(&write_fds); |
| 867 | nfds = ares_fds(channel, &read_fds, &write_fds); |
| 868 | if (nfds == 0) |
| 869 | break; |
| 870 | tvp = ares_timeout(channel, NULL, &tv); |
| 871 | count = select(nfds, &read_fds, &write_fds, NULL, tvp); |
| 872 | if (count < 0 && (status = SOCKERRNO) != EINVAL) |
| 873 | { |
| 874 | printf("select fail: %d", status); |
| 875 | return 1; |
| 876 | } |
| 877 | ares_process(channel, &read_fds, &write_fds); |
| 878 | } |
| 879 | ares_destroy(channel); |
| 880 | ares_library_cleanup(); |
| 881 | #ifdef USE_WINSOCK |
| 882 | WSACleanup(); |
| 883 | #endif |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | int showone_mark = 0; |
| 888 | struct hostent showone; |
| 889 | |
| 890 | void free_hostent(struct hostent* host){ |
| 891 | if(host == NULL) |
| 892 | return; |
| 893 | char **pptr; |
| 894 | if(host->h_name) |
| 895 | free(host->h_name); |
| 896 | if(host->h_aliases){ |
| 897 | for(pptr = host->h_aliases; *pptr != NULL; pptr++) |
| 898 | free(*pptr); |
| 899 | free(host->h_aliases); |
| 900 | } |
| 901 | if(host->h_addr_list){ |
| 902 | for(pptr = host->h_addr_list; *pptr != NULL; pptr++) |
| 903 | free(*pptr); |
| 904 | free(host->h_addr_list); |
| 905 | } |
| 906 | host->h_name = NULL; |
| 907 | host->h_aliases = NULL; |
| 908 | host->h_addrtype = 0; |
| 909 | host->h_length = 0; |
| 910 | host->h_addr_list = NULL; |
| 911 | } |
| 912 | void dns_callback (void* arg, int status, int timeouts, struct hostent* host) //ares ´¦ÀíÍê³É£¬·µ»ØDNS½âÎöµÄÐÅÏ¢ |
| 913 | { |
| 914 | char *ptr, **pptr; |
| 915 | char str[30]; |
| 916 | int len = 0; |
| 917 | char *hostname = NULL; |
| 918 | char **aliases = NULL; |
| 919 | char **addr_list = NULL; |
| 920 | int i = 0; |
| 921 | printf("dns_callback\n"); |
| 922 | if(status == ARES_SUCCESS){ |
| 923 | |
| 924 | showone.h_addrtype = host->h_addrtype; |
| 925 | showone.h_length = host->h_length; |
| 926 | if(strlen(host->h_name)){ |
| 927 | printf("host->h_name = %s\n", host->h_name); |
| 928 | hostname = malloc(strlen(host->h_name) + 1); |
| 929 | memcpy(hostname, host->h_name, strlen(host->h_name)); |
| 930 | hostname[strlen(host->h_name)] = '\0'; |
| 931 | showone.h_name = hostname; |
| 932 | } else |
| 933 | showone.h_name = NULL; |
| 934 | |
| 935 | i = 0; |
| 936 | for(pptr = host->h_aliases; *pptr != NULL; pptr++){ |
| 937 | i++; |
| 938 | } |
| 939 | if(i != 0){ |
| 940 | aliases = (char **)malloc((i+1) * sizeof(char *)); |
| 941 | i = 0; |
| 942 | for(pptr = host->h_aliases; *pptr != NULL; pptr++){ |
| 943 | aliases[i] = malloc(strlen(*pptr) + 1); |
| 944 | memcpy(aliases[i], *pptr, strlen(*pptr)); |
| 945 | aliases[i][strlen(*pptr)] = '\0'; |
| 946 | i++; |
| 947 | } |
| 948 | aliases[i] = NULL; |
| 949 | } |
| 950 | showone.h_aliases = aliases; |
| 951 | |
| 952 | switch(host->h_addrtype){ |
| 953 | case AF_INET: |
| 954 | case AF_INET6: |
| 955 | i = 0; |
| 956 | for(pptr = host->h_addr_list; *pptr != NULL; pptr++){ |
| 957 | i++; |
| 958 | inet_ntop(host->h_addrtype, *pptr, str, sizeof(str)); |
| 959 | printf("\t address: %s , %d, %x\n", str, strlen(str), *pptr); |
| 960 | } |
| 961 | if(i != 0){ |
| 962 | addr_list = (char **)malloc((i+1) * sizeof(char *)); |
| 963 | i = 0; |
| 964 | for(pptr = host->h_addr_list; *pptr != NULL; pptr++){ |
| 965 | addr_list[i] = malloc(host->h_length); |
| 966 | memcpy(addr_list[i], *pptr, host->h_length); |
| 967 | i++; |
| 968 | } |
| 969 | addr_list[i] = NULL; |
| 970 | } |
| 971 | showone.h_addr_list = addr_list; |
| 972 | break; |
| 973 | default: |
| 974 | break; |
| 975 | } |
| 976 | showone_mark = 2; |
| 977 | } |
| 978 | else{ |
| 979 | //printf("lookup failed: %d\n", status); |
| 980 | showone_mark = 3; |
| 981 | } |
| 982 | |
| 983 | } |
| 984 | |
| 985 | /************************************************************************** |
| 986 | * º¯ÊýÃû³Æ£º compat_gethostbyname3 |
| 987 | * ¹¦ÄÜÃèÊö£º Ö¸¶¨Íø¿Ú½øÐÐdnsÇëÇó |
| 988 | * ²ÎÊý˵Ã÷£º ÓòÃû£¬Íø¿ÚÃû£¬ÐÒé×壬»Øµ÷º¯Êý |
| 989 | * ·µ »Ø Öµ£º s |
| 990 | * ÆäËü˵Ã÷£º ²ÎÊýdev±ØÐëÊÇÖ¸ÕëÔÙmalloc£¬c-ares¿âÌṩµÄ½Ó¿ÚÄÚ»áfree(dev) |
| 991 | **************************************************************************/ |
| 992 | struct hostent *compat_gethostbyname3(char *name, char *dev, int family) |
| 993 | { |
| 994 | ares_channel channel; |
| 995 | int nfds, count; |
| 996 | int status; |
| 997 | fd_set readers, writers; |
| 998 | struct timeval *tvp, tv; |
| 999 | struct ares_options options; |
| 1000 | int optmask = ARES_OPT_FLAGS, dnsclass = C_IN, type = T_A; |
| 1001 | |
| 1002 | if (strlen(name) == 0 || strlen(dev) == 0) { |
| 1003 | printf("\tinvalid name or dev \n"); |
| 1004 | return NULL; |
| 1005 | } |
| 1006 | options.servers = NULL; |
| 1007 | options.nservers = 0; |
| 1008 | status = ares_init_options(&channel, &options, optmask, dev); |
| 1009 | if (status != ARES_SUCCESS) |
| 1010 | { |
| 1011 | fprintf(stderr, "ares_init_options: %s\n", |
| 1012 | ares_strerror(status)); |
| 1013 | return NULL; |
| 1014 | } |
| 1015 | |
| 1016 | while(showone_mark != 0){ |
| 1017 | sleep(1); |
| 1018 | } |
| 1019 | showone_mark = 1; |
| 1020 | memset(&showone, 0, sizeof(showone)); |
| 1021 | ares_gethostbyname(channel, name, family, dns_callback, NULL); //´«µÝ¸øc-ares channal ºÍ »Øµ÷ |
| 1022 | // main_loop(&channel); //Ö÷³ÌÐòʼþÑ»· |
| 1023 | while (1) { |
| 1024 | FD_ZERO(&readers); |
| 1025 | FD_ZERO(&writers); |
| 1026 | nfds = ares_fds(channel, &readers, &writers); //»ñÈ¡ares channelʹÓõÄFD |
| 1027 | if (nfds == 0) |
| 1028 | break; |
| 1029 | tvp = ares_timeout(channel, NULL, &tv); |
| 1030 | count = select(nfds, &readers, &writers, NULL, tvp); //½«aresµÄSOCKET FD ¼ÓÈëʼþÑ»· |
| 1031 | if (count < 0 && (status = SOCKERRNO) != EINVAL) |
| 1032 | { |
| 1033 | printf("select fail: %d", status); |
| 1034 | showone_mark = 0; |
| 1035 | return NULL; |
| 1036 | } |
| 1037 | ares_process(channel, &readers, &writers); // ÓÐʼþ·¢Éú ½»ÓÉares ´¦Àí |
| 1038 | } |
| 1039 | ares_destroy(channel); |
| 1040 | ares_library_cleanup(); |
| 1041 | while(showone_mark == 1){ |
| 1042 | sleep(1); |
| 1043 | } |
| 1044 | if (showone_mark == 2){ |
| 1045 | showone_mark = 0; |
| 1046 | return &showone; |
| 1047 | } |
| 1048 | if(showone_mark == 3) |
| 1049 | { |
| 1050 | showone_mark = 0; |
| 1051 | return NULL; |
| 1052 | } |
| 1053 | |
| 1054 | printf("adig unexpect error showone_mark = %d\n", showone_mark); |
| 1055 | return NULL; |
| 1056 | } |