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 NICHOST         "whois.crsnic.net"
  64 #define INICHOST        "whois.networksolutions.com"
  65 #define GNICHOST        "whois.nic.gov"
  66 #define ANICHOST        "whois.arin.net"
  67 #define LNICHOST        "whois.lacnic.net"
  68 #define KNICHOST        "whois.krnic.net"
  69 #define RNICHOST        "whois.ripe.net"
  70 #define PNICHOST        "whois.apnic.net"
  71 #define MNICHOST        "whois.ra.net"
  72 #define QNICHOST_TAIL   ".whois-servers.net"
  73 #define BNICHOST        "whois.registro.br"
  74 #define NORIDHOST       "whois.norid.no"
  75 #define IANAHOST        "whois.iana.org"
  76 #define GERMNICHOST     "de.whois-servers.net"
  77 #define FNICHOST        "whois.afrinic.net"
  78 #define DEFAULT_PORT    "whois"
  79 #define WHOIS_SERVER_ID "Whois Server: "
  80 #define WHOIS_ORG_SERVER_ID     "Registrant Street1:Whois Server:"
  81
  82 #define WHOIS_RECURSE           0x01
  83 #define WHOIS_QUICK             0x02
  84
  85 #define ishost(h) (isalnum((unsigned char)h) || h == '.' || h == '-')
  86
  87 static const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST,
  88                                   FNICHOST, NULL };
  89 static const char *port = DEFAULT_PORT;
  90
  91 static char *choose_server(char *);
  92 static struct addrinfo *gethostinfo(char const *host, int exit_on_error);
  93 static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
  94 static void usage(void);
  95 static void whois(const char *, const char *, int);
  96
  97 int
  98 main(int argc, char *argv[])
  99 {
 100         const char *country, *host;
 101         char *qnichost;
 102         int ch, flags, use_qnichost;
 103
 104 #ifdef  SOCKS
 105         SOCKSinit(argv[0]);
 106 #endif
 107
 108         country = host = qnichost = NULL;
 109         flags = use_qnichost = 0;
 110         while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:QrR6")) != -1) {
 111                 switch (ch) {
 112                 case 'a':
 113                         host = ANICHOST;
 114                         break;
 115                 case 'A':
 116                         host = PNICHOST;
 117                         break;
 118                 case 'b':
 119                         host = ABUSEHOST;
 120                         break;
 121                 case 'c':
 122                         country = optarg;
 123                         break;
 124                 case 'f':
 125                         host = FNICHOST;
 126                         break;
 127                 case 'g':
 128                         host = GNICHOST;
 129                         break;
 130                 case 'h':
 131                         host = optarg;
 132                         break;
 133                 case 'i':
 134                         host = INICHOST;
 135                         break;
 136                 case 'I':
 137                         host = IANAHOST;
 138                         break;
 139                 case 'k':
 140                         host = KNICHOST;
 141                         break;
 142                 case 'l':
 143                         host = LNICHOST;
 144                         break;
 145                 case 'm':
 146                         host = MNICHOST;
 147                         break;
 148                 case 'p':
 149                         port = optarg;
 150                         break;
 151                 case 'Q':
 152                         flags |= WHOIS_QUICK;
 153                         break;
 154                 case 'r':
 155                         host = RNICHOST;
 156                         break;
 157                 case 'R':
 158                         warnx("-R is deprecated; use '-c ru' instead");
 159                         country = "ru";
 160                         break;
 161                 /* Remove in FreeBSD 10 */
 162                 case '6':
 163                         errx(EX_USAGE,
 164                                 "-6 is deprecated; use -[aAflr] instead");
 165                         break;
 166                 case '?':
 167                 default:
 168                         usage();
 169                         /* NOTREACHED */
 170                 }
 171         }
 172         argc -= optind;
 173         argv += optind;
 174
 175         if (!argc || (country != NULL && host != NULL))
 176                 usage();
 177
 178         /*
 179          * If no host or country is specified determine the top level domain
 180          * from the query.  If the TLD is a number, query ARIN.  Otherwise, use
 181          * TLD.whois-server.net.  If the domain does not contain '.', fall
 182          * back to NICHOST.
 183          */
 184         if (host == NULL && country == NULL) {
 185                 if ((host = getenv("RA_SERVER")) == NULL) {
 186                         use_qnichost = 1;
 187                         host = NICHOST;
 188                         if (!(flags & WHOIS_QUICK))
 189                                 flags |= WHOIS_RECURSE;
 190                 }
 191         }
 192         while (argc-- > 0) {
 193                 if (country != NULL) {
 194                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 195                         whois(*argv, qnichost, flags);
 196                 } else if (use_qnichost)
 197                         if ((qnichost = choose_server(*argv)) != NULL)
 198                                 whois(*argv, qnichost, flags);
 199                 if (qnichost == NULL)
 200                         whois(*argv, host, flags);
 201                 free(qnichost);
 202                 qnichost = NULL;
 203                 argv++;
 204         }
 205         exit(0);
 206 }
 207
 208 /*
 209  * This function will remove any trailing periods from domain, after which it
 210  * returns a pointer to newly allocated memory containing the whois server to
 211  * be queried, or a NULL if the correct server couldn't be determined.  The
 212  * caller must remember to free(3) the allocated memory.
 213  */
 214 static char *
 215 choose_server(char *domain)
 216 {
 217         char *pos, *retval;
 218
 219         if (strchr(domain, ':')) {
 220                 s_asprintf(&retval, "%s", ANICHOST);
 221                 return (retval);
 222         }
 223         for (pos = strchr(domain, '\0'); pos > domain && *--pos == '.';)
 224                 *pos = '\0';
 225         if (*domain == '\0')
 226                 errx(EX_USAGE, "can't search for a null string");
 227         if (strlen(domain) > sizeof("-NORID")-1 &&
 228             strcasecmp(domain + strlen(domain) - sizeof("-NORID") + 1,
 229                 "-NORID") == 0) {
 230                 s_asprintf(&retval, "%s", NORIDHOST);
 231                 return (retval);
 232         }
 233         while (pos > domain && *pos != '.')
 234                 --pos;
 235         if (pos <= domain)
 236                 return (NULL);
 237         if (isdigit((unsigned char)*++pos))
 238                 s_asprintf(&retval, "%s", ANICHOST);
 239         else
 240                 s_asprintf(&retval, "%s%s", pos, QNICHOST_TAIL);
 241         return (retval);
 242 }
 243
 244 static struct addrinfo *
 245 gethostinfo(char const *host, int exit_on_error)
 246 {
 247         struct addrinfo hints, *res;
 248         int error;
 249
 250         memset(&hints, 0, sizeof(hints));
 251         hints.ai_flags = 0;
 252         hints.ai_family = AF_UNSPEC;
 253         hints.ai_socktype = SOCK_STREAM;
 254         error = getaddrinfo(host, port, &hints, &res);
 255         if (error) {
 256                 warnx("%s: %s", host, gai_strerror(error));
 257                 if (exit_on_error)
 258                         exit(EX_NOHOST);
 259                 return (NULL);
 260         }
 261         return (res);
 262 }
 263
 264 /*
 265  * Wrapper for asprintf(3) that exits on error.
 266  */
 267 static void
 268 s_asprintf(char **ret, const char *format, ...)
 269 {
 270         va_list ap;
 271
 272         va_start(ap, format);
 273         if (vasprintf(ret, format, ap) == -1) {
 274                 va_end(ap);
 275                 err(EX_OSERR, "vasprintf()");
 276         }
 277         va_end(ap);
 278 }
 279
 280 static void
 281 whois(const char *query, const char *hostname, int flags)
 282 {
 283         FILE *fp;
 284         struct addrinfo *hostres, *res;
 285         char *buf, *host, *nhost, *p;
 286         int i, j, s = -1, count;
 287         size_t c, len;
 288         struct pollfd *fds;
 289         int timeout = 180;
 290
 291         hostres = gethostinfo(hostname, 1);
 292         for (res = hostres, count = 0; res; res = res->ai_next)
 293                 count++;
 294
 295         fds = calloc(count, sizeof(*fds));
 296         if (fds == NULL)
 297                 err(EX_OSERR, "calloc()");
 298
 299         /*
 300          * Traverse the result list elements and make non-block
 301          * connection attempts.
 302          */
 303         count = i = 0;
 304         for (res = hostres; res != NULL; res = res->ai_next) {
 305                 s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
 306                     res->ai_protocol);
 307                 if (s < 0)
 308                         continue;
 309                 if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
 310                         if (errno == EINPROGRESS) {
 311                                 /* Add the socket to poll list */
 312                                 fds[i].fd = s;
 313                                 fds[i].events = POLLERR | POLLHUP |
 314                                                 POLLIN | POLLOUT;
 315                                 count++;
 316                                 i++;
 317                         } else {
 318                                 close(s);
 319                                 s = -1;
 320
 321                                 /*
 322                                  * Poll only if we have something to poll,
 323                                  * otherwise just go ahead and try next
 324                                  * address
 325                                  */
 326                                 if (count == 0)
 327                                         continue;
 328                         }
 329                 } else
 330                         goto done;
 331
 332                 /*
 333                  * If we are at the last address, poll until a connection is
 334                  * established or we failed all connection attempts.
 335                  */
 336                 if (res->ai_next == NULL)
 337                         timeout = INFTIM;
 338
 339                 /*
 340                  * Poll the watched descriptors for successful connections:
 341                  * if we still have more untried resolved addresses, poll only
 342                  * once; otherwise, poll until all descriptors have errors,
 343                  * which will be considered as ETIMEDOUT later.
 344                  */
 345                 do {
 346                         int n;
 347
 348                         n = poll(fds, i, timeout);
 349                         if (n == 0) {
 350                                 /*
 351                                  * No event reported in time.  Try with a
 352                                  * smaller timeout (but cap at 2-3ms)
 353                                  * after a new host have been added.
 354                                  */
 355                                 if (timeout >= 3)
 356                                         timeout <<= 1;
 357
 358                                 break;
 359                         } else if (n < 0) {
 360                                 /*
 361                                  * errno here can only be EINTR which we would want
 362                                  * to clean up and bail out.
 363                                  */
 364                                 s = -1;
 365                                 goto done;
 366                         }
 367
 368                         /*
 369                          * Check for the event(s) we have seen.
 370                          */
 371                         for (j = 0; j < i; j++) {
 372                                 if (fds[j].fd == -1 || fds[j].events == 0 ||
 373                                     fds[j].revents == 0)
 374                                         continue;
 375                                 if (fds[j].revents & ~(POLLIN | POLLOUT)) {
 376                                         close(s);
 377                                         fds[j].fd = -1;
 378                                         fds[j].events = 0;
 379                                         count--;
 380                                         continue;
 381                                 } else if (fds[j].revents & (POLLIN | POLLOUT)) {
 382                                         /* Connect succeeded. */
 383                                         s = fds[j].fd;
 384
 385                                         goto done;
 386                                 }
 387
 388                         }
 389                 } while (timeout == INFTIM && count != 0);
 390         }
 391
 392         /* All attempts were failed */
 393         s = -1;
 394         if (count == 0)
 395                 errno = ETIMEDOUT;
 396
 397 done:
 398         /* Close all watched fds except the succeeded one */
 399         for (j = 0; j < i; j++)
 400                 if (fds[j].fd != s && fds[j].fd != -1)
 401                         close(fds[j].fd);
 402
 403         if (s != -1) {
 404                 /* Restore default blocking behavior.  */
 405                 if ((flags = fcntl(s, F_GETFL)) != -1) {
 406                         flags &= ~O_NONBLOCK;
 407                         if (fcntl(s, F_SETFL, flags) == -1)
 408                                 err(EX_OSERR, "fcntl()");
 409                 } else
 410                         err(EX_OSERR, "fcntl()");
 411         }
 412
 413         free(fds);
 414         freeaddrinfo(hostres);
 415         if (s == -1)
 416                 err(EX_OSERR, "connect()");
 417
 418         fp = fdopen(s, "r+");
 419         if (fp == NULL)
 420                 err(EX_OSERR, "fdopen()");
 421         if (strcmp(hostname, GERMNICHOST) == 0) {
 422                 fprintf(fp, "-T dn,ace -C US-ASCII %s\r\n", query);
 423         } else if (strcmp(hostname, "dk" QNICHOST_TAIL) == 0) {
 424                 fprintf(fp, "--show-handles %s\r\n", query);
 425         } else {
 426                 fprintf(fp, "%s\r\n", query);
 427         }
 428         fflush(fp);
 429         nhost = NULL;
 430         while ((buf = fgetln(fp, &len)) != NULL) {
 431                 while (len > 0 && isspace((unsigned char)buf[len - 1]))
 432                         buf[--len] = '\0';
 433                 printf("%.*s\n", (int)len, buf);
 434
 435                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 436                         host = strnstr(buf, WHOIS_SERVER_ID, len);
 437                         if (host != NULL) {
 438                                 host += sizeof(WHOIS_SERVER_ID) - 1;
 439                                 for (p = host; p < buf + len; p++) {
 440                                         if (!ishost(*p)) {
 441                                                 *p = '\0';
 442                                                 break;
 443                                         }
 444                                 }
 445                                 s_asprintf(&nhost, "%.*s",
 446                                      (int)(buf + len - host), host);
 447                         } else if ((host =
 448                             strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
 449                                 host += sizeof(WHOIS_ORG_SERVER_ID) - 1;
 450                                 for (p = host; p < buf + len; p++) {
 451                                         if (!ishost(*p)) {
 452                                                 *p = '\0';
 453                                                 break;
 454                                         }
 455                                 }
 456                                 s_asprintf(&nhost, "%.*s",
 457                                     (int)(buf + len - host), host);
 458                         } else if (strcmp(hostname, ANICHOST) == 0) {
 459                                 for (c = 0; c <= len; c++)
 460                                         buf[c] = tolower((unsigned char)buf[c]);
 461                                 for (i = 0; ip_whois[i] != NULL; i++) {
 462                                         if (strnstr(buf, ip_whois[i], len) !=
 463                                             NULL) {
 464                                                 s_asprintf(&nhost, "%s",
 465                                                     ip_whois[i]);
 466                                                 break;
 467                                         }
 468                                 }
 469                         }
 470                 }
 471         }
 472         fclose(fp);
 473         if (nhost != NULL) {
 474                 whois(query, nhost, 0);
 475                 free(nhost);
 476         }
 477 }
 478
 479 static void
 480 usage(void)
 481 {
 482         fprintf(stderr,
 483             "usage: whois [-aAbfgiIklmQrR6] [-c country-code | -h hostname] "
 484             "[-p port] name ...\n");
 485         exit(EX_USAGE);
 486 }