usr/src/cmd/cmd-inet/usr.bin/whois.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
   6  *
   7  * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson <johann@myrkraverk.com>
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  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
  34 #include <sys/types.h>
  35 #include <sys/socket.h>
  36
  37 #include <netinet/in.h>
  38 #include <arpa/inet.h>
  39 #include <ctype.h>
  40 #include <err.h>
  41 #include <limits.h>
  42 #include <netdb.h>
  43 #include <stdarg.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <sysexits.h>
  48 #include <unistd.h>
  49
  50 #define ABUSEHOST       "whois.abuse.net"
  51 #define NICHOST         "whois.crsnic.net"
  52 #define INICHOST        "whois.networksolutions.com"
  53 #define GNICHOST        "whois.nic.gov"
  54 #define ANICHOST        "whois.arin.net"
  55 #define LNICHOST        "whois.lacnic.net"
  56 #define KNICHOST        "whois.krnic.net"
  57 #define RNICHOST        "whois.ripe.net"
  58 #define PNICHOST        "whois.apnic.net"
  59 #define MNICHOST        "whois.ra.net"
  60 #define QNICHOST_TAIL   ".whois-servers.net"
  61 #define BNICHOST        "whois.registro.br"
  62 #define NORIDHOST       "whois.norid.no"
  63 #define IANAHOST        "whois.iana.org"
  64 #define GERMNICHOST     "de.whois-servers.net"
  65 #define FNICHOST        "whois.afrinic.net"
  66 #define DEFAULT_PORT    "whois"
  67 #define WHOIS_SERVER_ID "Whois Server: "
  68 #define WHOIS_ORG_SERVER_ID     "Registrant Street1:Whois Server:"
  69
  70 #define WHOIS_RECURSE           0x01
  71 #define WHOIS_QUICK             0x02
  72
  73 #define ishost(h) (isalnum((unsigned char)h) || h == '.' || h == '-')
  74
  75 const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST,
  76     FNICHOST, NULL };
  77 const char *port = DEFAULT_PORT;
  78
  79 static char *choose_server(char *);
  80 static struct addrinfo *gethostinfo(char const *host, int exit_on_error);
  81 static void s_asprintf(char **ret, const char *format, ...);
  82 static void usage(void);
  83 static void whois(const char *, const char *, int);
  84
  85 int
  86 main(int argc, char *argv[])
  87 {
  88         const char *country, *host;
  89         char *qnichost;
  90         int ch, flags, use_qnichost;
  91
  92         country = host = qnichost = NULL;
  93         flags = use_qnichost = 0;
  94         while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:Qr")) != -1) {
  95                 switch (ch) {
  96                 case 'a':
  97                         host = ANICHOST;
  98                         break;
  99                 case 'A':
 100                         host = PNICHOST;
 101                         break;
 102                 case 'b':
 103                         host = ABUSEHOST;
 104                         break;
 105                 case 'c':
 106                         country = optarg;
 107                         break;
 108                 case 'f':
 109                         host = FNICHOST;
 110                         break;
 111                 case 'g':
 112                         host = GNICHOST;
 113                         break;
 114                 case 'h':
 115                         host = optarg;
 116                         break;
 117                 case 'i':
 118                         host = INICHOST;
 119                         break;
 120                 case 'I':
 121                         host = IANAHOST;
 122                         break;
 123                 case 'k':
 124                         host = KNICHOST;
 125                         break;
 126                 case 'l':
 127                         host = LNICHOST;
 128                         break;
 129                 case 'm':
 130                         host = MNICHOST;
 131                         break;
 132                 case 'p':
 133                         port = optarg;
 134                         break;
 135                 case 'Q':
 136                         flags |= WHOIS_QUICK;
 137                         break;
 138                 case 'r':
 139                         host = RNICHOST;
 140                         break;
 141                 case '?':
 142                 default:
 143                         usage();
 144                         /* NOTREACHED */
 145                 }
 146         }
 147         argc -= optind;
 148         argv += optind;
 149
 150         if (!argc || (country != NULL && host != NULL))
 151                 usage();
 152
 153         /*
 154          * If no host or country is specified determine the top level domain
 155          * from the query.  If the TLD is a number, query ARIN.  Otherwise, use
 156          * TLD.whois-server.net.  If the domain does not contain '.', fall
 157          * back to NICHOST.
 158          */
 159         if (host == NULL && country == NULL) {
 160                 use_qnichost = 1;
 161                 host = NICHOST;
 162                 if (!(flags & WHOIS_QUICK))
 163                         flags |= WHOIS_RECURSE;
 164         }
 165         while (argc-- > 0) {
 166                 if (country != NULL) {
 167                         s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
 168                         whois(*argv, qnichost, flags);
 169                 } else if (use_qnichost)
 170                         if ((qnichost = choose_server(*argv)) != NULL)
 171                                 whois(*argv, qnichost, flags);
 172                 if (qnichost == NULL)
 173                         whois(*argv, host, flags);
 174                 free(qnichost);
 175                 qnichost = NULL;
 176                 argv++;
 177         }
 178
 179         return (0);
 180 }
 181
 182 /*
 183  * This function will remove any trailing periods from domain, after which it
 184  * returns a pointer to newly allocated memory containing the whois server to
 185  * be queried, or a NULL if the correct server couldn't be determined.  The
 186  * caller must remember to free(3) the allocated memory.
 187  */
 188 static char *
 189 choose_server(char *domain)
 190 {
 191         char *pos, *retval;
 192
 193         if (strchr(domain, ':')) {
 194                 s_asprintf(&retval, "%s", ANICHOST);
 195                 return (retval);
 196         }
 197         for (pos = strchr(domain, '\0'); pos > domain && *--pos == '.'; )
 198                 *pos = '\0';
 199         if (*domain == '\0')
 200                 errx(EX_USAGE, "can't search for a null string");
 201         if (strlen(domain) > sizeof ("-NORID")-1 &&
 202             strcasecmp(domain + strlen(domain) - sizeof ("-NORID") + 1,
 203             "-NORID") == 0) {
 204                 s_asprintf(&retval, "%s", NORIDHOST);
 205                 return (retval);
 206         }
 207         while (pos > domain && *pos != '.')
 208                 --pos;
 209         if (pos <= domain)
 210                 return (NULL);
 211         if (isdigit((unsigned char)*++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(char const *host, int exit_on_error)
 220 {
 221         struct addrinfo hints, *res;
 222         int error;
 223
 224         (void) 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                 warnx("%s: %s", host, gai_strerror(error));
 231                 if (exit_on_error)
 232                         exit(EX_NOHOST);
 233                 return (NULL);
 234         }
 235         return (res);
 236 }
 237
 238 /*
 239  * Wrapper for asprintf(3) that exits on error.
 240  */
 241 /* PRINTFLIKE2 */
 242 static void
 243 s_asprintf(char **ret, const char *format, ...)
 244 {
 245         va_list ap;
 246
 247         va_start(ap, format);
 248         if (vasprintf(ret, format, ap) == -1) {
 249                 va_end(ap);
 250                 err(EX_OSERR, "vasprintf()");
 251         }
 252         va_end(ap);
 253 }
 254
 255 static void
 256 whois(const char *query, const char *hostname, int flags)
 257 {
 258         FILE *sfi, *sfo;
 259         struct addrinfo *hostres, *res;
 260         /*
 261          * The variables buf and buflen are static so the buffer for
 262          * getline() is retained across calls.
 263          */
 264         static char *buf = NULL;
 265         static size_t buflen = 0;
 266         char *host, *nhost, *p;
 267         int i, s;
 268         ssize_t c, len;
 269
 270         s = -1;
 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                 (void) 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                 (void) fprintf(sfo, "-T dn,ace -C US-ASCII %s\r\n", query);
 290         } else if (strcmp(hostname, "dk" QNICHOST_TAIL) == 0) {
 291                 (void) fprintf(sfo, "--show-handles %s\r\n", query);
 292         } else {
 293                 (void) fprintf(sfo, "%s\r\n", query);
 294         }
 295         (void) fflush(sfo);
 296         nhost = NULL;
 297         while ((len = getline(&buf, &buflen, sfi)) != -1) {
 298                 while (len > 0 && isspace((unsigned char)buf[len - 1]))
 299                         buf[--len] = '\0';
 300                 (void) printf("%.*s\n", (int)len, buf);
 301
 302                 if ((flags & WHOIS_RECURSE) && nhost == NULL) {
 303                         host = strnstr(buf, WHOIS_SERVER_ID, len);
 304                         if (host != NULL) {
 305                                 host += sizeof (WHOIS_SERVER_ID) - 1;
 306                                 for (p = host; p < buf + len; p++) {
 307                                         if (!ishost(*p)) {
 308                                                 *p = '\0';
 309                                                 break;
 310                                         }
 311                                 }
 312                                 s_asprintf(&nhost, "%.*s",
 313                                     (int)(buf + len - host), host);
 314                         } else if ((host =
 315                             strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
 316                                 host += sizeof (WHOIS_ORG_SERVER_ID) - 1;
 317                                 for (p = host; p < buf + len; p++) {
 318                                         if (!ishost(*p)) {
 319                                                 *p = '\0';
 320                                                 break;
 321                                         }
 322                                 }
 323                                 s_asprintf(&nhost, "%.*s",
 324                                     (int)(buf + len - host), host);
 325                         } else if (strcmp(hostname, ANICHOST) == 0) {
 326                                 for (c = 0; c <= len; c++)
 327                                         buf[c] = tolower((unsigned char)buf[c]);
 328                                 for (i = 0; ip_whois[i] != NULL; i++) {
 329                                         if (strnstr(buf, ip_whois[i], len) !=
 330                                             NULL) {
 331                                                 s_asprintf(&nhost, "%s",
 332                                                     ip_whois[i]);
 333                                                 break;
 334                                         }
 335                                 }
 336                         }
 337                 }
 338         }
 339         if (nhost != NULL) {
 340                 whois(query, nhost, 0);
 341                 free(nhost);
 342         }
 343 }
 344
 345 static void
 346 usage(void)
 347 {
 348         (void) fprintf(stderr,
 349             "usage: whois [-aAbfgiIklmQr] [-c country-code | -h hostname] "
 350             "[-p port] name ...\n");
 351         exit(EX_USAGE);
 352 }