usr.bin/whois/whois.c

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