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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)whois.c  8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/whois/whois.c,v 1.15.2.11 2003/02/25 20:59:41 roberto Exp $
  36  * $DragonFly: src/usr.bin/whois/whois.c,v 1.7 2005/02/17 11:53:33 liamfoy Exp $
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/socket.h>
  41
  42 #include <arpa/inet.h>
  43 #include <netinet/in.h>
  44
  45 #include <ctype.h>
  46 #include <err.h>
  47 #include <netdb.h>
  48 #include <stdarg.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <sysexits.h>
  53 #include <unistd.h>
  54
  55 #define ABUSEHOST       "whois.abuse.net"
  56 #define NICHOST         "whois.crsnic.net"
  57 #define INICHOST        "whois.networksolutions.com"
  58 #define DNICHOST        "whois.nic.mil"
  59 #define GNICHOST        "whois.nic.gov"
  60 #define ANICHOST        "whois.arin.net"
  61 #define LNICHOST        "whois.lacnic.net"
  62 #define KNICHOST        "whois.krnic.net"
  63 #define RNICHOST        "whois.ripe.net"
  64 #define PNICHOST        "whois.apnic.net"
  65 #define RUNICHOST       "whois.ripn.net"
  66 #define MNICHOST        "whois.ra.net"
  67 #define QNICHOST_TAIL   ".whois-servers.net"
  68 #define SNICHOST        "whois.6bone.net"
  69 #define IANAHOST        "whois.iana.org"
  70 #define GERMNICHOST     "de.whois-servers.net"
  71 #define BNICHOST        "whois.registro.br"
  72 #define WHOIS_SERVER_ID "Whois Server: "
  73 #define WHOIS_ORG_SERVER_ID     "Registrant Street1:Whois Server:"
  74
  75 #define DEFAULT_PORT    "whois"
  76 #define WHOIS_RECURSE           0x01
  77 #define WHOIS_QUICK             0x02
  78
  79 #define ishost(h) (isalnum(h) || h == '.' || h == '-')
  80
  81 const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST, NULL };
  82 const char *port = DEFAULT_PORT;
  83
  84 static char     *choose_server(const char *);
  85 static struct addrinfo *gethostinfo(const char *host, int exit_on_error);
  86 static void     s_asprintf(char **ret, const char *format, ...);
  87 static void     usage(void);
  88 static void     whois(const char *, const char *, int);
  89
  90 int
  91 main(int argc, char *argv[])
  92 {
  93         const char *country, *host;
  94         char *qnichost;
  95         int ch, flags, use_qnichost;
  96
  97 #ifdef  SOCKS
  98         SOCKSinit(argv[0]);
  99 #endif
 100
 101         country = host = qnichost = NULL;
 102         flags = use_qnichost = 0;
 103         while ((ch = getopt(argc, argv, "aAbc:dgh:ilkImp:QrR6")) != -1) {
 104                 switch (ch) {
 105                 case 'a':
 106                         host = ANICHOST;
 107                         break;
 108                 case 'A':
 109                         host = PNICHOST;
 110                         break;
 111                 case 'b':
 112                         host = ABUSEHOST;
 113                         break;
 114                 case 'c':
 115                         country = optarg;
 116                         break;
 117                 case 'd':
 118                         host = DNICHOST;
 119                         break;
 120                 case 'g':
 121                         host = GNICHOST;
 122                         break;
 123                 case 'h':
 124                         host = optarg;
 125                         break;
 126                 case 'i':
 127                         host = INICHOST;
 128                         break;
 129                 case 'I':
 130                         host = IANAHOST;
 131                         break;
 132                 case 'k':
 133                         host = KNICHOST;
 134                         break;
 135                 case 'l':
 136                         host = LNICHOST;
 137                         break;
 138                 case 'm':
 139                         host = MNICHOST;
 140                         break;
 141                 case 'p':
 142                         port = optarg;
 143                         break;
 144                 case 'Q':
 145                         flags |= WHOIS_QUICK;
 146                         break;
 147                 case 'r':
 148                         host = RNICHOST;
 149                         break;
 150                 case 'R':
 151                         host = RUNICHOST;
 152                         break;
 153                 case '6':
 154                         host = SNICHOST;
 155                         break;
 156                 case '?':
 157                 default:
 158                         usage();
 159                         /* NOTREACHED */
 160                 }
 161         }
 162         argc -= optind;
 163         argv += optind;
 164
 165         if (!argc || (country != NULL && host != NULL))
 166                 usage();
 167
 168         /*
 169          * If no host or country is specified determine the top level domain
 170          * from the query.  If the TLD is a number, query ARIN.  Otherwise, use
 171          * TLD.whois-server.net.  If the domain does not contain '.', fall
 172          * back to NICHOST.
 173          */
 174         if (host == NULL && country == NULL) {
 175                 use_qnichost = 1;
 176                 host = NICHOST;
 177                 if (!(flags & WHOIS_QUICK))
 178                         flags |= WHOIS_RECURSE;
 179         }
 180         while (argc-- > 0) {
 181                 if (country != NULL) {
 182                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 183                         whois(*argv, qnichost, flags);
 184                 } else if (use_qnichost)
 185                         if ((qnichost = choose_server(*argv)) != NULL)
 186                                 whois(*argv, qnichost, flags);
 187                 if (qnichost == NULL)
 188                         whois(*argv, host, flags);
 189                 free(qnichost);
 190                 qnichost = NULL;
 191                 argv++;
 192         }
 193         exit(0);
 194 }
 195
 196 /*
 197  * This function will remove any trailing periods from domain, after which it
 198  * returns a pointer to newly allocated memory containing the whois server to
 199  * be queried, or a NULL if the correct server couldn't be determined.  The
 200  * caller must remember to free(3) the allocated memory.
 201  */
 202 static char *
 203 choose_server(const char *domain)
 204 {
 205         char *pos, *retval;
 206
 207         for (pos = strchr(domain, '\0'); pos > domain && *--pos == '.';)
 208                 *pos = '\0';
 209         if (*domain == '\0')
 210                 errx(EX_USAGE, "can't search for a null string");
 211         while (pos > domain && *pos != '.')
 212                 --pos;
 213         if (pos <= domain)
 214                 return (NULL);
 215         if (isdigit(*++pos))
 216                 s_asprintf(&retval, "%s", ANICHOST);
 217         else
 218                 s_asprintf(&retval, "%s%s", pos, QNICHOST_TAIL);
 219         return (retval);
 220 }
 221
 222 static struct addrinfo *
 223 gethostinfo(const char *host, int exit_on_error)
 224 {
 225         struct addrinfo hints, *res;
 226         int error;
 227
 228         memset(&hints, 0, sizeof(hints));
 229         hints.ai_flags = 0;
 230         hints.ai_family = AF_UNSPEC;
 231         hints.ai_socktype = SOCK_STREAM;
 232         error = getaddrinfo(host, port, &hints, &res);
 233         if (error) {
 234                 if (error == EAI_SERVICE)
 235                         warnx("bad port: %s", port);
 236                 else
 237                         warnx("%s: %s", host, gai_strerror(error));
 238                 if (exit_on_error)
 239                         exit(EX_NOHOST);
 240                 return (NULL);
 241         }
 242         return (res);
 243 }
 244
 245 /*
 246  * Wrapper for asprintf(3) that exits on error.
 247  */
 248 static void
 249 s_asprintf(char **ret, const char *format, ...)
 250 {
 251
 252         va_list ap;
 253
 254         va_start(ap, format);
 255         if (vasprintf(ret, format, ap) == -1) {
 256                 va_end(ap);
 257                 err(EX_OSERR, "vasprintf()");
 258         }
 259         va_end(ap);
 260 }
 261
 262 static void
 263 whois(const char *query, const char *hostname, int flags)
 264 {
 265         FILE *sfi, *sfo;
 266         struct addrinfo *hostres, *res;
 267         char *buf, *host, *nhost, *p;
 268         int i, s = -1;
 269         size_t c, len;
 270
 271         hostres = gethostinfo(hostname, 1);
 272         for (res = hostres; res; res = res->ai_next) {
 273                 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 274                 if (s < 0)
 275                         continue;
 276                 if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
 277                         break;
 278                 close(s);
 279         }
 280         freeaddrinfo(hostres);
 281         if (res == NULL)
 282                 err(EX_OSERR, "connect()");
 283
 284         sfi = fdopen(s, "r");
 285         sfo = fdopen(s, "w");
 286         if (sfi == NULL || sfo == NULL)
 287                 err(EX_OSERR, "fdopen()");
 288         if (strcmp(hostname, GERMNICHOST) == 0) {
 289                 fprintf(sfo, "-T dn,ace -C US-ASCII %s\r\n", query);
 290         } else {
 291                 fprintf(sfo, "%s\r\n", query);
 292         }
 293         fflush(sfo);
 294         nhost = NULL;
 295         while ((buf = fgetln(sfi, &len)) != NULL) {
 296                 while (len > 0 && isspace(buf[len - 1]))
 297                         buf[--len] = '\0';
 298                 printf("%.*s\n", (int)len, buf);
 299
 300                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 301                         host = strnstr(buf, WHOIS_SERVER_ID, len);
 302                         if (host != NULL) {
 303                                 host += sizeof(WHOIS_SERVER_ID) - 1;
 304                                 for (p = host; p < buf + len; p++) {
 305                                         if (!ishost(*p)) {
 306                                                 *p = '\0';
 307                                                 break;
 308                                         }
 309                                 }
 310                                 s_asprintf(&nhost, "%.*s",
 311                                      (int)(buf + len - host), host);
 312                         } else if ((host =
 313                             strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
 314                                 host += sizeof(WHOIS_ORG_SERVER_ID) - 1;
 315                                 for (p = host; p < buf + len; p++) {
 316                                         if (!ishost(*p)) {
 317                                                 *p = '\0';
 318                                                 break;
 319                                         }
 320                                 }
 321                                 s_asprintf(&nhost, "%.*s",
 322                                     (int)(buf + len - host), host);
 323                         } else if (strcmp(hostname, ANICHOST) == 0) {
 324                                 for (c = 0; c <= len; c++)
 325                                         buf[c] = tolower((int)buf[c]);
 326                                 for (i = 0; ip_whois[i] != NULL; i++) {
 327                                         if (strnstr(buf, ip_whois[i], len) !=
 328                                             NULL) {
 329                                                 s_asprintf(&nhost, "%s",
 330                                                     ip_whois[i]);
 331                                                 break;
 332                                         }
 333                                 }
 334                         }
 335                 }
 336         }
 337         if (nhost != NULL) {
 338                 whois(query, nhost, 0);
 339                 free(nhost);
 340         }
 341 }
 342
 343 static void
 344 usage(void)
 345 {
 346         fprintf(stderr,
 347             "usage: whois [-aAbdgilkImQrR6] [-c country-code | -h hostname] "
 348             "[-p port] name ...\n");
 349         exit(EX_USAGE);
 350 }