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. 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  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)whois.c  8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/whois/whois.c,v 1.15.2.11 2003/02/25 20:59:41 roberto Exp $
  32  * $DragonFly: src/usr.bin/whois/whois.c,v 1.7 2005/02/17 11:53:33 liamfoy Exp $
  33  */
  34
  35 #include <sys/types.h>
  36 #include <sys/socket.h>
  37
  38 #include <arpa/inet.h>
  39 #include <netinet/in.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <netdb.h>
  44 #include <stdarg.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sysexits.h>
  49 #include <unistd.h>
  50
  51 #define ABUSEHOST       "whois.abuse.net"
  52 #define NICHOST         "whois.crsnic.net"
  53 #define INICHOST        "whois.networksolutions.com"
  54 #define DNICHOST        "whois.nic.mil"
  55 #define GNICHOST        "whois.nic.gov"
  56 #define ANICHOST        "whois.arin.net"
  57 #define LNICHOST        "whois.lacnic.net"
  58 #define KNICHOST        "whois.krnic.net"
  59 #define RNICHOST        "whois.ripe.net"
  60 #define PNICHOST        "whois.apnic.net"
  61 #define RUNICHOST       "whois.ripn.net"
  62 #define MNICHOST        "whois.ra.net"
  63 #define QNICHOST_TAIL   ".whois-servers.net"
  64 #define SNICHOST        "whois.6bone.net"
  65 #define IANAHOST        "whois.iana.org"
  66 #define GERMNICHOST     "de.whois-servers.net"
  67 #define BNICHOST        "whois.registro.br"
  68 #define WHOIS_SERVER_ID "Whois Server: "
  69 #define WHOIS_ORG_SERVER_ID     "Registrant Street1:Whois Server:"
  70
  71 #define DEFAULT_PORT    "whois"
  72 #define WHOIS_RECURSE           0x01
  73 #define WHOIS_QUICK             0x02
  74
  75 #define ishost(h) (isalnum(h) || h == '.' || h == '-')
  76
  77 const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST, NULL };
  78 const char *port = DEFAULT_PORT;
  79
  80 static char     *choose_server(const char *);
  81 static struct addrinfo *gethostinfo(const char *, int);
  82 static void     s_asprintf(char **, const char *, ...) __printflike(2, 3);
  83 static void     usage(void);
  84 static void     whois(const char *, const char *, int);
  85
  86 int
  87 main(int argc, char *argv[])
  88 {
  89         const char *country, *host;
  90         char *qnichost;
  91         int ch, flags, use_qnichost;
  92
  93 #ifdef  SOCKS
  94         SOCKSinit(argv[0]);
  95 #endif
  96
  97         country = host = qnichost = NULL;
  98         flags = use_qnichost = 0;
  99         while ((ch = getopt(argc, argv, "aAbc:dgh:ilkImp:QrR6")) != -1) {
 100                 switch (ch) {
 101                 case 'a':
 102                         host = ANICHOST;
 103                         break;
 104                 case 'A':
 105                         host = PNICHOST;
 106                         break;
 107                 case 'b':
 108                         host = ABUSEHOST;
 109                         break;
 110                 case 'c':
 111                         country = optarg;
 112                         break;
 113                 case 'd':
 114                         host = DNICHOST;
 115                         break;
 116                 case 'g':
 117                         host = GNICHOST;
 118                         break;
 119                 case 'h':
 120                         host = optarg;
 121                         break;
 122                 case 'i':
 123                         host = INICHOST;
 124                         break;
 125                 case 'I':
 126                         host = IANAHOST;
 127                         break;
 128                 case 'k':
 129                         host = KNICHOST;
 130                         break;
 131                 case 'l':
 132                         host = LNICHOST;
 133                         break;
 134                 case 'm':
 135                         host = MNICHOST;
 136                         break;
 137                 case 'p':
 138                         port = optarg;
 139                         break;
 140                 case 'Q':
 141                         flags |= WHOIS_QUICK;
 142                         break;
 143                 case 'r':
 144                         host = RNICHOST;
 145                         break;
 146                 case 'R':
 147                         host = RUNICHOST;
 148                         break;
 149                 case '6':
 150                         host = SNICHOST;
 151                         break;
 152                 case '?':
 153                 default:
 154                         usage();
 155                         /* NOTREACHED */
 156                 }
 157         }
 158         argc -= optind;
 159         argv += optind;
 160
 161         if (!argc || (country != NULL && host != NULL))
 162                 usage();
 163
 164         /*
 165          * If no host or country is specified determine the top level domain
 166          * from the query.  If the TLD is a number, query ARIN.  Otherwise, use
 167          * TLD.whois-server.net.  If the domain does not contain '.', fall
 168          * back to NICHOST.
 169          */
 170         if (host == NULL && country == NULL) {
 171                 use_qnichost = 1;
 172                 host = NICHOST;
 173                 if (!(flags & WHOIS_QUICK))
 174                         flags |= WHOIS_RECURSE;
 175         }
 176         while (argc-- > 0) {
 177                 if (country != NULL) {
 178                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 179                         whois(*argv, qnichost, flags);
 180                 } else if (use_qnichost)
 181                         if ((qnichost = choose_server(*argv)) != NULL)
 182                                 whois(*argv, qnichost, flags);
 183                 if (qnichost == NULL)
 184                         whois(*argv, host, flags);
 185                 free(qnichost);
 186                 qnichost = NULL;
 187                 argv++;
 188         }
 189         exit(0);
 190 }
 191
 192 /*
 193  * This function will remove any trailing periods from domain, after which it
 194  * returns a pointer to newly allocated memory containing the whois server to
 195  * be queried, or a NULL if the correct server couldn't be determined.  The
 196  * caller must remember to free(3) the allocated memory.
 197  */
 198 static char *
 199 choose_server(const char *domain)
 200 {
 201         char *pos, *retval;
 202
 203         for (pos = strchr(domain, '\0'); pos > domain && *--pos == '.';)
 204                 *pos = '\0';
 205         if (*domain == '\0')
 206                 errx(EX_USAGE, "can't search for a null string");
 207         while (pos > domain && *pos != '.')
 208                 --pos;
 209         if (pos <= domain)
 210                 return (NULL);
 211         if (isdigit(*++pos))
 212                 s_asprintf(&retval, "%s", ANICHOST);
 213         else
 214                 s_asprintf(&retval, "%s%s", pos, QNICHOST_TAIL);
 215         return (retval);
 216 }
 217
 218 static struct addrinfo *
 219 gethostinfo(const char *host, int exit_on_error)
 220 {
 221         struct addrinfo hints, *res;
 222         int error;
 223
 224         memset(&hints, 0, sizeof(hints));
 225         hints.ai_flags = 0;
 226         hints.ai_family = AF_UNSPEC;
 227         hints.ai_socktype = SOCK_STREAM;
 228         error = getaddrinfo(host, port, &hints, &res);
 229         if (error) {
 230                 if (error == EAI_SERVICE)
 231                         warnx("bad port: %s", port);
 232                 else
 233                         warnx("%s: %s", host, gai_strerror(error));
 234                 if (exit_on_error)
 235                         exit(EX_NOHOST);
 236                 return (NULL);
 237         }
 238         return (res);
 239 }
 240
 241 /*
 242  * Wrapper for asprintf(3) that exits on error.
 243  */
 244 static void
 245 s_asprintf(char **ret, const char *format, ...)
 246 {
 247
 248         va_list ap;
 249
 250         va_start(ap, format);
 251         if (vasprintf(ret, format, ap) == -1) {
 252                 va_end(ap);
 253                 err(EX_OSERR, "vasprintf()");
 254         }
 255         va_end(ap);
 256 }
 257
 258 static void
 259 whois(const char *query, const char *hostname, int flags)
 260 {
 261         FILE *sfi, *sfo;
 262         struct addrinfo *hostres, *res;
 263         char *buf, *host, *nhost, *p;
 264         int i, s = -1;
 265         size_t c, len;
 266
 267         hostres = gethostinfo(hostname, 1);
 268         for (res = hostres; res; res = res->ai_next) {
 269                 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 270                 if (s < 0)
 271                         continue;
 272                 if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
 273                         break;
 274                 close(s);
 275         }
 276         freeaddrinfo(hostres);
 277         if (res == NULL)
 278                 err(EX_OSERR, "connect()");
 279
 280         sfi = fdopen(s, "r");
 281         sfo = fdopen(s, "w");
 282         if (sfi == NULL || sfo == NULL)
 283                 err(EX_OSERR, "fdopen()");
 284         if (strcmp(hostname, GERMNICHOST) == 0) {
 285                 fprintf(sfo, "-T dn,ace -C US-ASCII %s\r\n", query);
 286         } else {
 287                 fprintf(sfo, "%s\r\n", query);
 288         }
 289         fflush(sfo);
 290         nhost = NULL;
 291         while ((buf = fgetln(sfi, &len)) != NULL) {
 292                 while (len > 0 && isspace(buf[len - 1]))
 293                         buf[--len] = '\0';
 294                 printf("%.*s\n", (int)len, buf);
 295
 296                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 297                         host = strnstr(buf, WHOIS_SERVER_ID, len);
 298                         if (host != NULL) {
 299                                 host += sizeof(WHOIS_SERVER_ID) - 1;
 300                                 for (p = host; p < buf + len; p++) {
 301                                         if (!ishost(*p)) {
 302                                                 *p = '\0';
 303                                                 break;
 304                                         }
 305                                 }
 306                                 s_asprintf(&nhost, "%.*s",
 307                                      (int)(buf + len - host), host);
 308                         } else if ((host =
 309                             strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
 310                                 host += sizeof(WHOIS_ORG_SERVER_ID) - 1;
 311                                 for (p = host; p < buf + len; p++) {
 312                                         if (!ishost(*p)) {
 313                                                 *p = '\0';
 314                                                 break;
 315                                         }
 316                                 }
 317                                 s_asprintf(&nhost, "%.*s",
 318                                     (int)(buf + len - host), host);
 319                         } else if (strcmp(hostname, ANICHOST) == 0) {
 320                                 for (c = 0; c <= len; c++)
 321                                         buf[c] = tolower((int)buf[c]);
 322                                 for (i = 0; ip_whois[i] != NULL; i++) {
 323                                         if (strnstr(buf, ip_whois[i], len) !=
 324                                             NULL) {
 325                                                 s_asprintf(&nhost, "%s",
 326                                                     ip_whois[i]);
 327                                                 break;
 328                                         }
 329                                 }
 330                         }
 331                 }
 332         }
 333         if (nhost != NULL) {
 334                 whois(query, nhost, 0);
 335                 free(nhost);
 336         }
 337 }
 338
 339 static void
 340 usage(void)
 341 {
 342         fprintf(stderr,
 343             "usage: whois [-aAbdgilkImQrR6] [-c country-code | -h hostname] "
 344             "[-p port] name ...\n");
 345         exit(EX_USAGE);
 346 }