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         { ".gov.uk", "ac.uk" QNICHOST_TAIL },
 105         { "", IANAHOST }, /* default */
 106         { NULL, NULL } /* safety belt */
 107 };
 108
 109 #define WHOIS_REFERRAL(s) { s, sizeof(s) - 1 }
 110 static struct {
 111         const char *prefix;
 112         size_t len;
 113 } whois_referral[] = {
 114         WHOIS_REFERRAL("whois:"), /* IANA */
 115         WHOIS_REFERRAL("Whois Server:"),
 116         WHOIS_REFERRAL("Registrar WHOIS Server:"), /* corporatedomains.com */
 117         WHOIS_REFERRAL("ReferralServer:  whois://"), /* ARIN */
 118         WHOIS_REFERRAL("descr:          region. Please query"), /* AfriNIC */
 119         { NULL, 0 }
 120 };
 121
 122 static const char *actually_arin[] = {
 123         "netname:        ERX-NETBLOCK\n", /* APNIC */
 124         "netname:        NON-RIPE-NCC-MANAGED-ADDRESS-BLOCK\n",
 125         NULL
 126 };
 127
 128 static const char *port = DEFAULT_PORT;
 129
 130 static const char *choose_server(char *);
 131 static struct addrinfo *gethostinfo(char const *host, int exitnoname);
 132 static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
 133 static void usage(void);
 134 static void whois(const char *, const char *, int);
 135
 136 int
 137 main(int argc, char *argv[])
 138 {
 139         const char *country, *host;
 140         int ch, flags;
 141
 142 #ifdef  SOCKS
 143         SOCKSinit(argv[0]);
 144 #endif
 145
 146         country = host = NULL;
 147         flags = 0;
 148         while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:PQrRS")) != -1) {
 149                 switch (ch) {
 150                 case 'a':
 151                         host = ANICHOST;
 152                         break;
 153                 case 'A':
 154                         host = PNICHOST;
 155                         break;
 156                 case 'b':
 157                         host = ABUSEHOST;
 158                         break;
 159                 case 'c':
 160                         country = optarg;
 161                         break;
 162                 case 'f':
 163                         host = FNICHOST;
 164                         break;
 165                 case 'g':
 166                         host = GNICHOST;
 167                         break;
 168                 case 'h':
 169                         host = optarg;
 170                         break;
 171                 case 'i':
 172                         host = INICHOST;
 173                         break;
 174                 case 'I':
 175                         host = IANAHOST;
 176                         break;
 177                 case 'k':
 178                         host = KNICHOST;
 179                         break;
 180                 case 'l':
 181                         host = LNICHOST;
 182                         break;
 183                 case 'm':
 184                         host = MNICHOST;
 185                         break;
 186                 case 'p':
 187                         port = optarg;
 188                         break;
 189                 case 'P':
 190                         host = PDBHOST;
 191                         break;
 192                 case 'Q':
 193                         flags |= WHOIS_QUICK;
 194                         break;
 195                 case 'r':
 196                         host = RNICHOST;
 197                         break;
 198                 case 'R':
 199                         flags |= WHOIS_RECURSE;
 200                         break;
 201                 case 'S':
 202                         flags |= WHOIS_SPAM_ME;
 203                         break;
 204                 case '?':
 205                 default:
 206                         usage();
 207                         /* NOTREACHED */
 208                 }
 209         }
 210         argc -= optind;
 211         argv += optind;
 212
 213         if (!argc || (country != NULL && host != NULL))
 214                 usage();
 215
 216         /*
 217          * If no host or country is specified, rely on referrals from IANA.
 218          */
 219         if (host == NULL && country == NULL) {
 220                 if ((host = getenv("WHOIS_SERVER")) == NULL &&
 221                     (host = getenv("RA_SERVER")) == NULL) {
 222                         if (!(flags & WHOIS_QUICK))
 223                                 flags |= WHOIS_RECURSE;
 224                 }
 225         }
 226         while (argc-- > 0) {
 227                 if (country != NULL) {
 228                         char *qnichost;
 229                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 230                         whois(*argv, qnichost, flags);
 231                         free(qnichost);
 232                 } else
 233                         whois(*argv, host != NULL ? host :
 234                               choose_server(*argv), flags);
 235                 argv++;
 236         }
 237         exit(0);
 238 }
 239
 240 static const char *
 241 choose_server(char *domain)
 242 {
 243         size_t len = strlen(domain);
 244         int i;
 245
 246         for (i = 0; whoiswhere[i].suffix != NULL; i++) {
 247                 size_t suffix_len = strlen(whoiswhere[i].suffix);
 248                 if (len > suffix_len &&
 249                     strcasecmp(domain + len - suffix_len,
 250                                whoiswhere[i].suffix) == 0)
 251                         return (whoiswhere[i].server);
 252         }
 253         errx(EX_SOFTWARE, "no default whois server");
 254 }
 255
 256 static struct addrinfo *
 257 gethostinfo(char const *host, int exit_on_noname)
 258 {
 259         struct addrinfo hints, *res;
 260         int error;
 261
 262         memset(&hints, 0, sizeof(hints));
 263         hints.ai_flags = AI_CANONNAME;
 264         hints.ai_family = AF_UNSPEC;
 265         hints.ai_socktype = SOCK_STREAM;
 266         res = NULL;
 267         error = getaddrinfo(host, port, &hints, &res);
 268         if (error && (exit_on_noname || error != EAI_NONAME))
 269                 err(EX_NOHOST, "%s: %s", host, gai_strerror(error));
 270         return (res);
 271 }
 272
 273 /*
 274  * Wrapper for asprintf(3) that exits on error.
 275  */
 276 static void
 277 s_asprintf(char **ret, const char *format, ...)
 278 {
 279         va_list ap;
 280
 281         va_start(ap, format);
 282         if (vasprintf(ret, format, ap) == -1) {
 283                 va_end(ap);
 284                 err(EX_OSERR, "vasprintf()");
 285         }
 286         va_end(ap);
 287 }
 288
 289 static int
 290 connect_to_any_host(struct addrinfo *hostres)
 291 {
 292         struct addrinfo *res;
 293         nfds_t i, j;
 294         size_t count;
 295         struct pollfd *fds;
 296         int timeout = 180, s = -1;
 297
 298         for (res = hostres, count = 0; res; res = res->ai_next)
 299                 count++;
 300         fds = calloc(count, sizeof(*fds));
 301         if (fds == NULL)
 302                 err(EX_OSERR, "calloc()");
 303
 304         /*
 305          * Traverse the result list elements and make non-block
 306          * connection attempts.
 307          */
 308         count = i = 0;
 309         for (res = hostres; res != NULL; res = res->ai_next) {
 310                 s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
 311                     res->ai_protocol);
 312                 if (s < 0)
 313                         continue;
 314                 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 315                         if (errno == EINPROGRESS) {
 316                                 /* Add the socket to poll list */
 317                                 fds[i].fd = s;
 318                                 fds[i].events = POLLERR | POLLHUP |
 319                                                 POLLIN | POLLOUT;
 320                                 /*
 321                                  * From here until a socket connects, the
 322                                  * socket fd is owned by the fds[] poll array.
 323                                  */
 324                                 s = -1;
 325                                 count++;
 326                                 i++;
 327                         } else {
 328                                 close(s);
 329                                 s = -1;
 330
 331                                 /*
 332                                  * Poll only if we have something to poll,
 333                                  * otherwise just go ahead and try next
 334                                  * address
 335                                  */
 336                                 if (count == 0)
 337                                         continue;
 338                         }
 339                 } else
 340                         goto done;
 341
 342                 /*
 343                  * If we are at the last address, poll until a connection is
 344                  * established or we failed all connection attempts.
 345                  */
 346                 if (res->ai_next == NULL)
 347                         timeout = INFTIM;
 348
 349                 /*
 350                  * Poll the watched descriptors for successful connections:
 351                  * if we still have more untried resolved addresses, poll only
 352                  * once; otherwise, poll until all descriptors have errors,
 353                  * which will be considered as ETIMEDOUT later.
 354                  */
 355                 do {
 356                         int n;
 357
 358                         n = poll(fds, i, timeout);
 359                         if (n == 0) {
 360                                 /*
 361                                  * No event reported in time.  Try with a
 362                                  * smaller timeout (but cap at 2-3ms)
 363                                  * after a new host have been added.
 364                                  */
 365                                 if (timeout >= 3)
 366                                         timeout >>= 1;
 367
 368                                 break;
 369                         } else if (n < 0) {
 370                                 /*
 371                                  * errno here can only be EINTR which we would
 372                                  * want to clean up and bail out.
 373                                  */
 374                                 s = -1;
 375                                 goto done;
 376                         }
 377
 378                         /*
 379                          * Check for the event(s) we have seen.
 380                          */
 381                         for (j = 0; j < i; j++) {
 382                                 if (fds[j].fd == -1 || fds[j].events == 0 ||
 383                                     fds[j].revents == 0)
 384                                         continue;
 385                                 if (fds[j].revents & ~(POLLIN | POLLOUT)) {
 386                                         close(fds[j].fd);
 387                                         fds[j].fd = -1;
 388                                         fds[j].events = 0;
 389                                         count--;
 390                                         continue;
 391                                 } else if (fds[j].revents & (POLLIN | POLLOUT)) {
 392                                         /* Connect succeeded. */
 393                                         s = fds[j].fd;
 394                                         fds[j].fd = -1;
 395
 396                                         goto done;
 397                                 }
 398
 399                         }
 400                 } while (timeout == INFTIM && count != 0);
 401         }
 402
 403         /* All attempts were failed */
 404         s = -1;
 405         if (count == 0)
 406                 errno = ETIMEDOUT;
 407
 408 done:
 409         /* Close all watched fds except the succeeded one */
 410         for (j = 0; j < i; j++)
 411                 if (fds[j].fd != -1)
 412                         close(fds[j].fd);
 413         free(fds);
 414         return (s);
 415 }
 416
 417 static void
 418 whois(const char *query, const char *hostname, int flags)
 419 {
 420         FILE *fp;
 421         struct addrinfo *hostres;
 422         char *buf, *host, *nhost, *p;
 423         int s, f;
 424         size_t len, i;
 425
 426         hostres = gethostinfo(hostname, 1);
 427         s = connect_to_any_host(hostres);
 428         if (s == -1)
 429                 err(EX_OSERR, "connect()");
 430
 431         /* Restore default blocking behavior.  */
 432         if ((f = fcntl(s, F_GETFL)) == -1)
 433                 err(EX_OSERR, "fcntl()");
 434         f &= ~O_NONBLOCK;
 435         if (fcntl(s, F_SETFL, f) == -1)
 436                 err(EX_OSERR, "fcntl()");
 437
 438         fp = fdopen(s, "r+");
 439         if (fp == NULL)
 440                 err(EX_OSERR, "fdopen()");
 441
 442         if (!(flags & WHOIS_SPAM_ME) &&
 443             (strcasecmp(hostname, DENICHOST) == 0 ||
 444              strcasecmp(hostname, "de" QNICHOST_TAIL) == 0)) {
 445                 const char *q;
 446                 int idn = 0;
 447                 for (q = query; *q != '\0'; q++)
 448                         if (!isascii(*q))
 449                                 idn = 1;
 450                 fprintf(fp, "-T dn%s %s\r\n", idn ? "" : ",ace", query);
 451         } else if (!(flags & WHOIS_SPAM_ME) &&
 452                    (strcasecmp(hostname, DKNICHOST) == 0 ||
 453                     strcasecmp(hostname, "dk" QNICHOST_TAIL) == 0))
 454                 fprintf(fp, "--show-handles %s\r\n", query);
 455         else if ((flags & WHOIS_SPAM_ME) ||
 456                  strchr(query, ' ') != NULL)
 457                 fprintf(fp, "%s\r\n", query);
 458         else if (strcasecmp(hostname, ANICHOST) == 0) {
 459                 if (strncasecmp(query, "AS", 2) == 0 &&
 460                     strspn(query+2, "0123456789") == strlen(query+2))
 461                         fprintf(fp, "+ a %s\r\n", query+2);
 462                 else
 463                         fprintf(fp, "+ %s\r\n", query);
 464         } else if (strcasecmp(hostres->ai_canonname, VNICHOST) == 0)
 465                 fprintf(fp, "domain %s\r\n", query);
 466         else
 467                 fprintf(fp, "%s\r\n", query);
 468         fflush(fp);
 469
 470         nhost = NULL;
 471         while ((buf = fgetln(fp, &len)) != NULL) {
 472                 /* Nominet */
 473                 if (!(flags & WHOIS_SPAM_ME) &&
 474                     len == 5 && strncmp(buf, "-- \r\n", 5) == 0)
 475                         break;
 476
 477                 printf("%.*s", (int)len, buf);
 478
 479                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 480                         for (i = 0; whois_referral[i].prefix != NULL; i++) {
 481                                 p = buf;
 482                                 SCAN(p, buf+len, *p == ' ');
 483                                 if (strncasecmp(p, whois_referral[i].prefix,
 484                                                    whois_referral[i].len) != 0)
 485                                         continue;
 486                                 p += whois_referral[i].len;
 487                                 SCAN(p, buf+len, *p == ' ');
 488                                 host = p;
 489                                 SCAN(p, buf+len, ishost(*p));
 490                                 /* avoid loops */
 491                                 if (strncmp(hostname, host, p - host) != 0)
 492                                         s_asprintf(&nhost, "%.*s",
 493                                                    (int)(p - host), host);
 494                                 break;
 495                         }
 496                         for (i = 0; actually_arin[i] != NULL; i++) {
 497                                 if (strncmp(buf, actually_arin[i], len) == 0) {
 498                                         s_asprintf(&nhost, "%s", ANICHOST);
 499                                         break;
 500                                 }
 501                         }
 502                 }
 503                 /* Verisign etc. */
 504                 if (!(flags & WHOIS_SPAM_ME) &&
 505                     len >= sizeof(CHOPSPAM)-1 &&
 506                     (strncasecmp(buf, CHOPSPAM, sizeof(CHOPSPAM)-1) == 0 ||
 507                      strncasecmp(buf, CHOPSPAM+4, sizeof(CHOPSPAM)-5) == 0)) {
 508                         printf("\n");
 509                         break;
 510                 }
 511         }
 512         fclose(fp);
 513         freeaddrinfo(hostres);
 514         if (nhost != NULL) {
 515                 whois(query, nhost, flags);
 516                 free(nhost);
 517         }
 518 }
 519
 520 static void
 521 usage(void)
 522 {
 523         fprintf(stderr,
 524             "usage: whois [-aAbfgiIklmPQrRS] [-c country-code | -h hostname] "
 525             "[-p port] name ...\n");
 526         exit(EX_USAGE);
 527 }