adv_cmds/whois/whois.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1980, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #if 0
  39 #ifndef lint
  40 static char sccsid[] = "@(#)whois.c     8.1 (Berkeley) 6/6/93";
  41 #endif /* not lint */
  42 #endif
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include <sys/types.h>
  48 #include <sys/socket.h>
  49 #include <sys/poll.h>
  50 #include <netinet/in.h>
  51 #include <arpa/inet.h>
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <netdb.h>
  55 #include <stdarg.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <sysexits.h>
  60 #include <unistd.h>
  61 #include <fcntl.h>
  62 #include <errno.h>
  63
  64 #ifdef __APPLE__
  65 #ifndef SOCK_NONBLOCK
  66 #define SOCK_NONBLOCK 0
  67 #endif
  68 #ifndef INFTIM
  69 #define INFTIM -1
  70 #endif
  71 #endif
  72
  73 #define ABUSEHOST       "whois.abuse.net"
  74 #define ANICHOST        "whois.arin.net"
  75 #define DENICHOST       "whois.denic.de"
  76 #define DKNICHOST       "whois.dk-hostmaster.dk"
  77 #define FNICHOST        "whois.afrinic.net"
  78 #define GNICHOST        "whois.nic.gov"
  79 #define IANAHOST        "whois.iana.org"
  80 #define INICHOST        "whois.internic.net"
  81 #define KNICHOST        "whois.krnic.net"
  82 #define LNICHOST        "whois.lacnic.net"
  83 #define MNICHOST        "whois.ra.net"
  84 #define PDBHOST         "whois.peeringdb.com"
  85 #define PNICHOST        "whois.apnic.net"
  86 #define QNICHOST_TAIL   ".whois-servers.net"
  87 #define RNICHOST        "whois.ripe.net"
  88 #define VNICHOST        "whois.verisign-grs.com"
  89
  90 #ifdef __APPLE__
  91 #define DEFAULT_PORT    "nicname"
  92 #else
  93 #define DEFAULT_PORT    "whois"
  94 #endif
  95
  96 #define WHOIS_RECURSE   0x01
  97 #define WHOIS_QUICK     0x02
  98 #define WHOIS_SPAM_ME   0x04
  99
 100 #define CHOPSPAM        ">>> Last update of WHOIS database:"
 101
 102 #define ishost(h) (isalnum((unsigned char)h) || h == '.' || h == '-')
 103
 104 #define SCAN(p, end, check)                                     \
 105         while ((p) < (end))                                     \
 106                 if (check) ++(p);                               \
 107                 else break
 108
 109 static struct {
 110         const char *suffix, *server;
 111 } whoiswhere[] = {
 112         /* Various handles */
 113         { "-ARIN", ANICHOST },
 114         { "-NICAT", "at" QNICHOST_TAIL },
 115         { "-NORID", "no" QNICHOST_TAIL },
 116         { "-RIPE", RNICHOST },
 117         /* Nominet's whois server doesn't return referrals to JANET */
 118         { ".ac.uk", "ac.uk" QNICHOST_TAIL },
 119         { ".gov.uk", "ac.uk" QNICHOST_TAIL },
 120         { "", IANAHOST }, /* default */
 121         { NULL, NULL } /* safety belt */
 122 };
 123
 124 #define WHOIS_REFERRAL(s) { s, sizeof(s) - 1 }
 125 static struct {
 126         const char *prefix;
 127         size_t len;
 128 } whois_referral[] = {
 129         WHOIS_REFERRAL("whois:"), /* IANA */
 130         WHOIS_REFERRAL("Whois Server:"),
 131         WHOIS_REFERRAL("Registrar WHOIS Server:"), /* corporatedomains.com */
 132         WHOIS_REFERRAL("ReferralServer:  whois://"), /* ARIN */
 133         WHOIS_REFERRAL("descr:          region. Please query"), /* AfriNIC */
 134         { NULL, 0 }
 135 };
 136
 137 /*
 138  * We have a list of patterns for RIRs that assert ignorance rather than
 139  * providing referrals. If that happens, we guess that ARIN will be more
 140  * helpful. But, before following a referral to an RIR, we check if we have
 141  * asked that RIR already, and if so we make another guess.
 142  */
 143 static const char *actually_arin[] = {
 144         "netname:        ERX-NETBLOCK\n", /* APNIC */
 145         "netname:        NON-RIPE-NCC-MANAGED-ADDRESS-BLOCK\n",
 146         NULL
 147 };
 148
 149 static struct {
 150         int loop;
 151         const char *host;
 152 } try_rir[] = {
 153         { 0, ANICHOST },
 154         { 0, RNICHOST },
 155         { 0, PNICHOST },
 156         { 0, FNICHOST },
 157         { 0, LNICHOST },
 158         { 0, NULL }
 159 };
 160
 161 static void
 162 reset_rir(void) {
 163         int i;
 164
 165         for (i = 0; try_rir[i].host != NULL; i++)
 166                 try_rir[i].loop = 0;
 167 }
 168
 169 static const char *port = DEFAULT_PORT;
 170
 171 static const char *choose_server(char *);
 172 static struct addrinfo *gethostinfo(char const *host, int exitnoname);
 173 #ifdef __APPLE__
 174 static void s_asprintf(char **ret, const char *format, ...) __attribute__((__format__(printf, 2, 3)));
 175 #else
 176 static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
 177 #endif
 178 static void usage(void);
 179 static void whois(const char *, const char *, int);
 180
 181 int
 182 main(int argc, char *argv[])
 183 {
 184         const char *country, *host;
 185         int ch, flags;
 186
 187 #ifdef  SOCKS
 188         SOCKSinit(argv[0]);
 189 #endif
 190
 191         country = host = NULL;
 192         flags = 0;
 193         while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:PQrRS")) != -1) {
 194                 switch (ch) {
 195                 case 'a':
 196                         host = ANICHOST;
 197                         break;
 198                 case 'A':
 199                         host = PNICHOST;
 200                         break;
 201                 case 'b':
 202                         host = ABUSEHOST;
 203                         break;
 204                 case 'c':
 205                         country = optarg;
 206                         break;
 207                 case 'f':
 208                         host = FNICHOST;
 209                         break;
 210                 case 'g':
 211                         host = GNICHOST;
 212                         break;
 213                 case 'h':
 214                         host = optarg;
 215                         break;
 216                 case 'i':
 217                         host = INICHOST;
 218                         break;
 219                 case 'I':
 220                         host = IANAHOST;
 221                         break;
 222                 case 'k':
 223                         host = KNICHOST;
 224                         break;
 225                 case 'l':
 226                         host = LNICHOST;
 227                         break;
 228                 case 'm':
 229                         host = MNICHOST;
 230                         break;
 231                 case 'p':
 232                         port = optarg;
 233                         break;
 234                 case 'P':
 235                         host = PDBHOST;
 236                         break;
 237                 case 'Q':
 238                         flags |= WHOIS_QUICK;
 239                         break;
 240                 case 'r':
 241                         host = RNICHOST;
 242                         break;
 243                 case 'R':
 244                         flags |= WHOIS_RECURSE;
 245                         break;
 246                 case 'S':
 247                         flags |= WHOIS_SPAM_ME;
 248                         break;
 249                 case '?':
 250                 default:
 251                         usage();
 252                         /* NOTREACHED */
 253                 }
 254         }
 255         argc -= optind;
 256         argv += optind;
 257
 258         if (!argc || (country != NULL && host != NULL))
 259                 usage();
 260
 261         /*
 262          * If no host or country is specified, rely on referrals from IANA.
 263          */
 264         if (host == NULL && country == NULL) {
 265                 if ((host = getenv("WHOIS_SERVER")) == NULL &&
 266                     (host = getenv("RA_SERVER")) == NULL) {
 267                         if (!(flags & WHOIS_QUICK))
 268                                 flags |= WHOIS_RECURSE;
 269                 }
 270         }
 271         while (argc-- > 0) {
 272                 if (country != NULL) {
 273                         char *qnichost;
 274                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 275                         whois(*argv, qnichost, flags);
 276                         free(qnichost);
 277                 } else
 278                         whois(*argv, host != NULL ? host :
 279                               choose_server(*argv), flags);
 280                 reset_rir();
 281                 argv++;
 282         }
 283         exit(0);
 284 }
 285
 286 static const char *
 287 choose_server(char *domain)
 288 {
 289         size_t len = strlen(domain);
 290         int i;
 291
 292         for (i = 0; whoiswhere[i].suffix != NULL; i++) {
 293                 size_t suffix_len = strlen(whoiswhere[i].suffix);
 294                 if (len > suffix_len &&
 295                     strcasecmp(domain + len - suffix_len,
 296                                whoiswhere[i].suffix) == 0)
 297                         return (whoiswhere[i].server);
 298         }
 299         errx(EX_SOFTWARE, "no default whois server");
 300 }
 301
 302 static struct addrinfo *
 303 gethostinfo(char const *host, int exit_on_noname)
 304 {
 305         struct addrinfo hints, *res;
 306         int error;
 307
 308         memset(&hints, 0, sizeof(hints));
 309         hints.ai_flags = AI_CANONNAME;
 310         hints.ai_family = AF_UNSPEC;
 311         hints.ai_socktype = SOCK_STREAM;
 312         res = NULL;
 313         error = getaddrinfo(host, port, &hints, &res);
 314         if (error && (exit_on_noname || error != EAI_NONAME))
 315                 err(EX_NOHOST, "%s: %s", host, gai_strerror(error));
 316         return (res);
 317 }
 318
 319 /*
 320  * Wrapper for asprintf(3) that exits on error.
 321  */
 322 static void
 323 s_asprintf(char **ret, const char *format, ...)
 324 {
 325         va_list ap;
 326
 327         va_start(ap, format);
 328         if (vasprintf(ret, format, ap) == -1) {
 329                 va_end(ap);
 330                 err(EX_OSERR, "vasprintf()");
 331         }
 332         va_end(ap);
 333 }
 334
 335 static int
 336 connect_to_any_host(struct addrinfo *hostres)
 337 {
 338         struct addrinfo *res;
 339         nfds_t i, j;
 340         size_t count;
 341         struct pollfd *fds;
 342         int timeout = 180, s = -1;
 343
 344         for (res = hostres, count = 0; res; res = res->ai_next)
 345                 count++;
 346         fds = calloc(count, sizeof(*fds));
 347         if (fds == NULL)
 348                 err(EX_OSERR, "calloc()");
 349
 350         /*
 351          * Traverse the result list elements and make non-block
 352          * connection attempts.
 353          */
 354         count = i = 0;
 355         for (res = hostres; res != NULL; res = res->ai_next) {
 356                 s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
 357                     res->ai_protocol);
 358                 if (s < 0)
 359                         continue;
 360 #ifdef __APPLE__
 361                 int flags = fcntl(s, F_GETFL, 0);
 362                 if (flags < 0) {
 363                         close(s);
 364                         continue;
 365                 }
 366                 flags |= O_NONBLOCK;
 367                 if (fcntl(s, F_SETFL, flags) != 0) {
 368                         close(s);
 369                         continue;
 370                 }
 371 #endif
 372                 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 373                         if (errno == EINPROGRESS) {
 374                                 /* Add the socket to poll list */
 375                                 fds[i].fd = s;
 376                                 fds[i].events = POLLERR | POLLHUP |
 377                                                 POLLIN | POLLOUT;
 378                                 /*
 379                                  * From here until a socket connects, the
 380                                  * socket fd is owned by the fds[] poll array.
 381                                  */
 382                                 s = -1;
 383                                 count++;
 384                                 i++;
 385                         } else {
 386                                 close(s);
 387                                 s = -1;
 388
 389                                 /*
 390                                  * Poll only if we have something to poll,
 391                                  * otherwise just go ahead and try next
 392                                  * address
 393                                  */
 394                                 if (count == 0)
 395                                         continue;
 396                         }
 397                 } else
 398                         goto done;
 399
 400                 /*
 401                  * If we are at the last address, poll until a connection is
 402                  * established or we failed all connection attempts.
 403                  */
 404                 if (res->ai_next == NULL)
 405                         timeout = INFTIM;
 406
 407                 /*
 408                  * Poll the watched descriptors for successful connections:
 409                  * if we still have more untried resolved addresses, poll only
 410                  * once; otherwise, poll until all descriptors have errors,
 411                  * which will be considered as ETIMEDOUT later.
 412                  */
 413                 do {
 414                         int n;
 415
 416                         n = poll(fds, i, timeout);
 417                         if (n == 0) {
 418                                 /*
 419                                  * No event reported in time.  Try with a
 420                                  * smaller timeout (but cap at 2-3ms)
 421                                  * after a new host have been added.
 422                                  */
 423                                 if (timeout >= 3)
 424                                         timeout >>= 1;
 425
 426                                 break;
 427                         } else if (n < 0) {
 428                                 /*
 429                                  * errno here can only be EINTR which we would
 430                                  * want to clean up and bail out.
 431                                  */
 432                                 s = -1;
 433                                 goto done;
 434                         }
 435
 436                         /*
 437                          * Check for the event(s) we have seen.
 438                          */
 439                         for (j = 0; j < i; j++) {
 440                                 if (fds[j].fd == -1 || fds[j].events == 0 ||
 441                                     fds[j].revents == 0)
 442                                         continue;
 443                                 if (fds[j].revents & ~(POLLIN | POLLOUT)) {
 444                                         close(fds[j].fd);
 445                                         fds[j].fd = -1;
 446                                         fds[j].events = 0;
 447                                         count--;
 448                                         continue;
 449                                 } else if (fds[j].revents & (POLLIN | POLLOUT)) {
 450                                         /* Connect succeeded. */
 451                                         s = fds[j].fd;
 452                                         fds[j].fd = -1;
 453
 454                                         goto done;
 455                                 }
 456
 457                         }
 458                 } while (timeout == INFTIM && count != 0);
 459         }
 460
 461         /* All attempts were failed */
 462         s = -1;
 463         if (count == 0)
 464                 errno = ETIMEDOUT;
 465
 466 done:
 467         /* Close all watched fds except the succeeded one */
 468         for (j = 0; j < i; j++)
 469                 if (fds[j].fd != -1)
 470                         close(fds[j].fd);
 471         free(fds);
 472         return (s);
 473 }
 474
 475 static void
 476 whois(const char *query, const char *hostname, int flags)
 477 {
 478         FILE *fp;
 479         struct addrinfo *hostres;
 480         char *buf, *host, *nhost, *p;
 481         int comment, s, f;
 482         size_t len, i;
 483
 484         hostres = gethostinfo(hostname, 1);
 485         s = connect_to_any_host(hostres);
 486         if (s == -1)
 487                 err(EX_OSERR, "connect()");
 488
 489         /* Restore default blocking behavior.  */
 490         if ((f = fcntl(s, F_GETFL)) == -1)
 491                 err(EX_OSERR, "fcntl()");
 492         f &= ~O_NONBLOCK;
 493         if (fcntl(s, F_SETFL, f) == -1)
 494                 err(EX_OSERR, "fcntl()");
 495
 496         fp = fdopen(s, "r+");
 497         if (fp == NULL)
 498                 err(EX_OSERR, "fdopen()");
 499
 500         if (!(flags & WHOIS_SPAM_ME) &&
 501             (strcasecmp(hostname, DENICHOST) == 0 ||
 502              strcasecmp(hostname, "de" QNICHOST_TAIL) == 0)) {
 503                 const char *q;
 504                 int idn = 0;
 505                 for (q = query; *q != '\0'; q++)
 506                         if (!isascii(*q))
 507                                 idn = 1;
 508                 fprintf(fp, "-T dn%s %s\r\n", idn ? "" : ",ace", query);
 509         } else if (!(flags & WHOIS_SPAM_ME) &&
 510                    (strcasecmp(hostname, DKNICHOST) == 0 ||
 511                     strcasecmp(hostname, "dk" QNICHOST_TAIL) == 0))
 512                 fprintf(fp, "--show-handles %s\r\n", query);
 513         else if ((flags & WHOIS_SPAM_ME) ||
 514                  strchr(query, ' ') != NULL)
 515                 fprintf(fp, "%s\r\n", query);
 516         else if (strcasecmp(hostname, ANICHOST) == 0) {
 517                 if (strncasecmp(query, "AS", 2) == 0 &&
 518                     strspn(query+2, "0123456789") == strlen(query+2))
 519                         fprintf(fp, "+ a %s\r\n", query+2);
 520                 else
 521                         fprintf(fp, "+ %s\r\n", query);
 522         } else if (strcasecmp(hostres->ai_canonname, VNICHOST) == 0)
 523                 fprintf(fp, "domain %s\r\n", query);
 524         else
 525                 fprintf(fp, "%s\r\n", query);
 526         fflush(fp);
 527
 528         comment = 0;
 529         if (!(flags & WHOIS_SPAM_ME) &&
 530             (strcasecmp(hostname, ANICHOST) == 0 ||
 531              strcasecmp(hostname, RNICHOST) == 0)) {
 532                 comment = 2;
 533         }
 534
 535         nhost = NULL;
 536         while ((buf = fgetln(fp, &len)) != NULL) {
 537                 /* Nominet */
 538                 if (!(flags & WHOIS_SPAM_ME) &&
 539                     len == 5 && strncmp(buf, "-- \r\n", 5) == 0)
 540                         break;
 541                 /* RIRs */
 542                 if (comment == 1 && buf[0] == '#')
 543                         break;
 544                 else if (comment == 2) {
 545                         if (strchr("#%\r\n", buf[0]) != NULL)
 546                                 continue;
 547                         else
 548                                 comment = 1;
 549                 }
 550
 551                 printf("%.*s", (int)len, buf);
 552
 553                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 554                         for (i = 0; whois_referral[i].prefix != NULL; i++) {
 555                                 p = buf;
 556                                 SCAN(p, buf+len, *p == ' ');
 557                                 if (strncasecmp(p, whois_referral[i].prefix,
 558                                                    whois_referral[i].len) != 0)
 559                                         continue;
 560                                 p += whois_referral[i].len;
 561                                 SCAN(p, buf+len, *p == ' ');
 562                                 host = p;
 563                                 SCAN(p, buf+len, ishost(*p));
 564                                 if (p > host)
 565                                         s_asprintf(&nhost, "%.*s",
 566                                                    (int)(p - host), host);
 567                                 break;
 568                         }
 569                         for (i = 0; actually_arin[i] != NULL; i++) {
 570                                 if (strncmp(buf, actually_arin[i], len) == 0) {
 571                                         s_asprintf(&nhost, "%s", ANICHOST);
 572                                         break;
 573                                 }
 574                         }
 575                 }
 576                 /* Verisign etc. */
 577                 if (!(flags & WHOIS_SPAM_ME) &&
 578                     len >= sizeof(CHOPSPAM)-1 &&
 579                     (strncasecmp(buf, CHOPSPAM, sizeof(CHOPSPAM)-1) == 0 ||
 580                      strncasecmp(buf, CHOPSPAM+4, sizeof(CHOPSPAM)-5) == 0)) {
 581                         printf("\n");
 582                         break;
 583                 }
 584         }
 585         fclose(fp);
 586         freeaddrinfo(hostres);
 587
 588         f = 0;
 589         for (i = 0; try_rir[i].host != NULL; i++) {
 590                 /* Remember visits to RIRs */
 591                 if (try_rir[i].loop == 0 &&
 592                     strcasecmp(try_rir[i].host, hostname) == 0)
 593                         try_rir[i].loop = 1;
 594                 /* Do we need to find an alternative RIR? */
 595                 if (try_rir[i].loop != 0 && nhost != NULL &&
 596                     strcasecmp(try_rir[i].host, nhost) == 0) {
 597                             free(nhost);
 598                             nhost = NULL;
 599                             f = 1;
 600                 }
 601         }
 602         if (f) {
 603                 /* Find a replacement RIR */
 604                 for (i = 0; try_rir[i].host != NULL; i++) {
 605                         if (try_rir[i].loop == 0) {
 606                                 s_asprintf(&nhost, "%s",
 607                                         try_rir[i].host);
 608                                 break;
 609                         }
 610                 }
 611         }
 612         if (nhost != NULL) {
 613                 /* Ignore self-referrals */
 614                 if (strcasecmp(hostname, nhost) != 0) {
 615                         printf("# %s\n\n", nhost);
 616                         whois(query, nhost, flags);
 617                 }
 618                 free(nhost);
 619         }
 620 }
 621
 622 static void
 623 usage(void)
 624 {
 625         fprintf(stderr,
 626             "usage: whois [-aAbfgiIklmPQrRS] [-c country-code | -h hostname] "
 627             "[-p port] name ...\n");
 628         exit(EX_USAGE);
 629 }