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
31static 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
38static 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
87static const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST,
88				  FNICHOST, NULL };
89static const char *port = DEFAULT_PORT;
90
91static char *choose_server(char *);
92static struct addrinfo *gethostinfo(char const *host, int exit_on_error);
93static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
94static void usage(void);
95static void whois(const char *, const char *, int);
96
97int
98main(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 */
214static char *
215choose_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
244static struct addrinfo *
245gethostinfo(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 */
267static void
268s_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
280static void
281whois(const char *query, const char *hostname, int flags)
282{
283	FILE *sfi, *sfo;
284	struct addrinfo *hostres, *res;
285	char *buf, *host, *nhost, *p;
286	int s = -1, f;
287	nfds_t i, j;
288	size_t c, len, count;
289	struct pollfd *fds;
290	int timeout = 180;
291
292	hostres = gethostinfo(hostname, 1);
293	for (res = hostres, count = 0; res; res = res->ai_next)
294		count++;
295
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 want
363				 * 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
398done:
399	/* Close all watched fds except the succeeded one */
400	for (j = 0; j < i; j++)
401		if (fds[j].fd != s && fds[j].fd != -1)
402			close(fds[j].fd);
403
404	if (s != -1) {
405                /* Restore default blocking behavior.  */
406                if ((f = fcntl(s, F_GETFL)) != -1) {
407                        f &= ~O_NONBLOCK;
408                        if (fcntl(s, F_SETFL, f) == -1)
409                                err(EX_OSERR, "fcntl()");
410                } else
411			err(EX_OSERR, "fcntl()");
412        }
413
414	free(fds);
415	freeaddrinfo(hostres);
416	if (s == -1)
417		err(EX_OSERR, "connect()");
418
419	sfi = fdopen(s, "r");
420	sfo = fdopen(s, "w");
421	if (sfi == NULL || sfo == NULL)
422		err(EX_OSERR, "fdopen()");
423	if (strcmp(hostname, GERMNICHOST) == 0) {
424		fprintf(sfo, "-T dn,ace -C US-ASCII %s\r\n", query);
425	} else if (strcmp(hostname, "dk" QNICHOST_TAIL) == 0) {
426		fprintf(sfo, "--show-handles %s\r\n", query);
427	} else {
428		fprintf(sfo, "%s\r\n", query);
429	}
430	fflush(sfo);
431	nhost = NULL;
432	while ((buf = fgetln(sfi, &len)) != NULL) {
433		while (len > 0 && isspace((unsigned char)buf[len - 1]))
434			buf[--len] = '\0';
435		printf("%.*s\n", (int)len, buf);
436
437		if ((flags & WHOIS_RECURSE) && nhost == NULL) {
438			host = strnstr(buf, WHOIS_SERVER_ID, len);
439			if (host != NULL) {
440				host += sizeof(WHOIS_SERVER_ID) - 1;
441				for (p = host; p < buf + len; p++) {
442					if (!ishost(*p)) {
443						*p = '\0';
444						break;
445					}
446				}
447				s_asprintf(&nhost, "%.*s",
448				     (int)(buf + len - host), host);
449			} else if ((host =
450			    strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
451				host += sizeof(WHOIS_ORG_SERVER_ID) - 1;
452				for (p = host; p < buf + len; p++) {
453					if (!ishost(*p)) {
454						*p = '\0';
455						break;
456					}
457				}
458				s_asprintf(&nhost, "%.*s",
459				    (int)(buf + len - host), host);
460			} else if (strcmp(hostname, ANICHOST) == 0) {
461				for (c = 0; c <= len; c++)
462					buf[c] = tolower((unsigned char)buf[c]);
463				for (i = 0; ip_whois[i] != NULL; i++) {
464					if (strnstr(buf, ip_whois[i], len) !=
465					    NULL) {
466						s_asprintf(&nhost, "%s",
467						    ip_whois[i]);
468						break;
469					}
470				}
471			}
472		}
473	}
474	if (nhost != NULL) {
475		whois(query, nhost, 0);
476		free(nhost);
477	}
478}
479
480static void
481usage(void)
482{
483	fprintf(stderr,
484	    "usage: whois [-aAbfgiIklmQrR6] [-c country-code | -h hostname] "
485	    "[-p port] name ...\n");
486	exit(EX_USAGE);
487}
488