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