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https://github.com/freebsd/freebsd-src
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522 lines
13 KiB
C
522 lines
13 KiB
C
/*-
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1980, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)whois.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/poll.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#define ABUSEHOST "whois.abuse.net"
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#define ANICHOST "whois.arin.net"
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#define BNICHOST "whois.registro.br"
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#define FNICHOST "whois.afrinic.net"
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#define GERMNICHOST "de.whois-servers.net"
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#define GNICHOST "whois.nic.gov"
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#define IANAHOST "whois.iana.org"
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#define INICHOST "whois.networksolutions.com"
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#define KNICHOST "whois.krnic.net"
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#define LNICHOST "whois.lacnic.net"
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#define MNICHOST "whois.ra.net"
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#define NICHOST "whois.crsnic.net"
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#define PDBHOST "whois.peeringdb.com"
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#define PNICHOST "whois.apnic.net"
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#define QNICHOST_HEAD "whois.nic."
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#define QNICHOST_TAIL ".whois-servers.net"
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#define RNICHOST "whois.ripe.net"
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#define DEFAULT_PORT "whois"
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#define WHOIS_SERVER_ID "Whois Server: "
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#define WHOIS_ORG_SERVER_ID "Registrant Street1:Whois Server:"
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#define WHOIS_RECURSE 0x01
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#define WHOIS_QUICK 0x02
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#define ishost(h) (isalnum((unsigned char)h) || h == '.' || h == '-')
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static struct {
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const char *suffix, *server;
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} whoiswhere[] = {
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/* Various handles */
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{ "-ARIN", ANICHOST },
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{ "-NICAT", "at" QNICHOST_TAIL },
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{ "-NORID", "no" QNICHOST_TAIL },
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{ "-RIPE", RNICHOST },
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/* Nominet's whois server doesn't return referrals to JANET */
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{ ".ac.uk", "ac.uk" QNICHOST_TAIL },
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{ NULL, NULL }
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};
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static const char *ip_whois[] = { LNICHOST, RNICHOST, PNICHOST, BNICHOST,
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FNICHOST, NULL };
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static const char *port = DEFAULT_PORT;
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static char *choose_server(char *);
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static struct addrinfo *gethostinfo(char const *host, int exitnoname);
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static void s_asprintf(char **ret, const char *format, ...) __printflike(2, 3);
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static void usage(void);
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static void whois(const char *, const char *, int);
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int
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main(int argc, char *argv[])
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{
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const char *country, *host;
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char *qnichost;
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int ch, flags, use_qnichost;
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#ifdef SOCKS
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SOCKSinit(argv[0]);
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#endif
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country = host = qnichost = NULL;
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flags = use_qnichost = 0;
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while ((ch = getopt(argc, argv, "aAbc:fgh:iIklmp:PQr")) != -1) {
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switch (ch) {
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case 'a':
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host = ANICHOST;
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break;
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case 'A':
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host = PNICHOST;
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break;
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case 'b':
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host = ABUSEHOST;
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break;
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case 'c':
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country = optarg;
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break;
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case 'f':
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host = FNICHOST;
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break;
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case 'g':
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host = GNICHOST;
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break;
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case 'h':
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host = optarg;
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break;
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case 'i':
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host = INICHOST;
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break;
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case 'I':
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host = IANAHOST;
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break;
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case 'k':
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host = KNICHOST;
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break;
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case 'l':
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host = LNICHOST;
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break;
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case 'm':
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host = MNICHOST;
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break;
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case 'p':
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port = optarg;
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break;
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case 'P':
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host = PDBHOST;
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break;
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case 'Q':
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flags |= WHOIS_QUICK;
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break;
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case 'r':
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host = RNICHOST;
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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}
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argc -= optind;
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argv += optind;
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if (!argc || (country != NULL && host != NULL))
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usage();
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/*
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* If no host or country is specified, try to determine the top
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* level domain from the query, or fall back to NICHOST.
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*/
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if (host == NULL && country == NULL) {
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if ((host = getenv("WHOIS_SERVER")) == NULL &&
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(host = getenv("RA_SERVER")) == NULL) {
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use_qnichost = 1;
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host = NICHOST;
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if (!(flags & WHOIS_QUICK))
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flags |= WHOIS_RECURSE;
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}
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}
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while (argc-- > 0) {
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if (country != NULL) {
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s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
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whois(*argv, qnichost, flags);
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} else if (use_qnichost)
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if ((qnichost = choose_server(*argv)) != NULL)
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whois(*argv, qnichost, flags);
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if (qnichost == NULL)
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whois(*argv, host, flags);
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free(qnichost);
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qnichost = NULL;
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argv++;
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}
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exit(0);
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}
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/*
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* This function will remove any trailing periods from domain, after which it
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* returns a pointer to newly allocated memory containing the whois server to
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* be queried, or a NULL if the correct server couldn't be determined. The
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* caller must remember to free(3) the allocated memory.
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*
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* If the domain is an IPv6 address or has a known suffix, that determines
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* the server, else if the TLD is a number, query ARIN, else try a couple of
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* formulaic server names. Fail if the domain does not contain '.'.
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*/
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static char *
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choose_server(char *domain)
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{
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char *pos, *retval;
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int i;
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struct addrinfo *res;
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if (strchr(domain, ':')) {
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s_asprintf(&retval, "%s", ANICHOST);
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return (retval);
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}
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for (pos = strchr(domain, '\0'); pos > domain && pos[-1] == '.';)
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*--pos = '\0';
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if (*domain == '\0')
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errx(EX_USAGE, "can't search for a null string");
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for (i = 0; whoiswhere[i].suffix != NULL; i++) {
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size_t suffix_len = strlen(whoiswhere[i].suffix);
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if (domain + suffix_len < pos &&
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strcasecmp(pos - suffix_len, whoiswhere[i].suffix) == 0) {
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s_asprintf(&retval, "%s", whoiswhere[i].server);
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return (retval);
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}
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}
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while (pos > domain && *pos != '.')
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--pos;
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if (pos <= domain)
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return (NULL);
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if (isdigit((unsigned char)*++pos)) {
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s_asprintf(&retval, "%s", ANICHOST);
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return (retval);
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}
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/* Try possible alternative whois server name formulae. */
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for (i = 0; ; ++i) {
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switch (i) {
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case 0:
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s_asprintf(&retval, "%s%s", pos, QNICHOST_TAIL);
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break;
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case 1:
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s_asprintf(&retval, "%s%s", QNICHOST_HEAD, pos);
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break;
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default:
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return (NULL);
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}
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res = gethostinfo(retval, 0);
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if (res) {
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freeaddrinfo(res);
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return (retval);
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} else {
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free(retval);
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continue;
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}
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}
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}
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static struct addrinfo *
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gethostinfo(char const *host, int exit_on_noname)
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{
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struct addrinfo hints, *res;
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int error;
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memset(&hints, 0, sizeof(hints));
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hints.ai_flags = 0;
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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res = NULL;
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error = getaddrinfo(host, port, &hints, &res);
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if (error && (exit_on_noname || error != EAI_NONAME))
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err(EX_NOHOST, "%s: %s", host, gai_strerror(error));
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return (res);
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}
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/*
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* Wrapper for asprintf(3) that exits on error.
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*/
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static void
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s_asprintf(char **ret, const char *format, ...)
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{
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va_list ap;
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va_start(ap, format);
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if (vasprintf(ret, format, ap) == -1) {
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va_end(ap);
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err(EX_OSERR, "vasprintf()");
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}
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va_end(ap);
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}
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static void
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whois(const char *query, const char *hostname, int flags)
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{
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FILE *fp;
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struct addrinfo *hostres, *res;
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char *buf, *host, *nhost, *p;
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int s = -1, f;
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nfds_t i, j;
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size_t c, len, count;
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struct pollfd *fds;
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int timeout = 180;
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hostres = gethostinfo(hostname, 1);
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for (res = hostres, count = 0; res; res = res->ai_next)
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count++;
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fds = calloc(count, sizeof(*fds));
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if (fds == NULL)
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err(EX_OSERR, "calloc()");
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/*
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* Traverse the result list elements and make non-block
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* connection attempts.
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*/
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count = i = 0;
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for (res = hostres; res != NULL; res = res->ai_next) {
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s = socket(res->ai_family, res->ai_socktype | SOCK_NONBLOCK,
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res->ai_protocol);
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if (s < 0)
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continue;
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if (connect(s, res->ai_addr, res->ai_addrlen) < 0) {
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if (errno == EINPROGRESS) {
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/* Add the socket to poll list */
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fds[i].fd = s;
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fds[i].events = POLLERR | POLLHUP |
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POLLIN | POLLOUT;
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count++;
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i++;
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} else {
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close(s);
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s = -1;
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/*
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* Poll only if we have something to poll,
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* otherwise just go ahead and try next
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* address
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*/
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if (count == 0)
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continue;
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}
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} else
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goto done;
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/*
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* If we are at the last address, poll until a connection is
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* established or we failed all connection attempts.
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*/
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if (res->ai_next == NULL)
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timeout = INFTIM;
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/*
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* Poll the watched descriptors for successful connections:
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* if we still have more untried resolved addresses, poll only
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* once; otherwise, poll until all descriptors have errors,
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* which will be considered as ETIMEDOUT later.
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*/
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do {
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int n;
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n = poll(fds, i, timeout);
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if (n == 0) {
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/*
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* No event reported in time. Try with a
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* smaller timeout (but cap at 2-3ms)
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* after a new host have been added.
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*/
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if (timeout >= 3)
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timeout <<= 1;
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break;
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} else if (n < 0) {
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/*
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* errno here can only be EINTR which we would want
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* to clean up and bail out.
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*/
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s = -1;
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goto done;
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}
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/*
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* Check for the event(s) we have seen.
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*/
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for (j = 0; j < i; j++) {
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if (fds[j].fd == -1 || fds[j].events == 0 ||
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fds[j].revents == 0)
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continue;
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if (fds[j].revents & ~(POLLIN | POLLOUT)) {
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close(s);
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fds[j].fd = -1;
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fds[j].events = 0;
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count--;
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continue;
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} else if (fds[j].revents & (POLLIN | POLLOUT)) {
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/* Connect succeeded. */
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s = fds[j].fd;
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goto done;
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}
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}
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} while (timeout == INFTIM && count != 0);
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}
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/* All attempts were failed */
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s = -1;
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if (count == 0)
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errno = ETIMEDOUT;
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done:
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/* Close all watched fds except the succeeded one */
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for (j = 0; j < i; j++)
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if (fds[j].fd != s && fds[j].fd != -1)
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close(fds[j].fd);
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if (s != -1) {
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/* Restore default blocking behavior. */
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if ((f = fcntl(s, F_GETFL)) != -1) {
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f &= ~O_NONBLOCK;
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if (fcntl(s, F_SETFL, f) == -1)
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err(EX_OSERR, "fcntl()");
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} else
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err(EX_OSERR, "fcntl()");
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}
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free(fds);
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freeaddrinfo(hostres);
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if (s == -1)
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err(EX_OSERR, "connect()");
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fp = fdopen(s, "r+");
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if (fp == NULL)
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err(EX_OSERR, "fdopen()");
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if (strcmp(hostname, GERMNICHOST) == 0) {
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fprintf(fp, "-T dn,ace -C US-ASCII %s\r\n", query);
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} else if (strcmp(hostname, "dk" QNICHOST_TAIL) == 0) {
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fprintf(fp, "--show-handles %s\r\n", query);
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} else {
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fprintf(fp, "%s\r\n", query);
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}
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fflush(fp);
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nhost = NULL;
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while ((buf = fgetln(fp, &len)) != NULL) {
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while (len > 0 && isspace((unsigned char)buf[len - 1]))
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buf[--len] = '\0';
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printf("%.*s\n", (int)len, buf);
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if ((flags & WHOIS_RECURSE) && nhost == NULL) {
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host = strnstr(buf, WHOIS_SERVER_ID, len);
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if (host != NULL) {
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host += sizeof(WHOIS_SERVER_ID) - 1;
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for (p = host; p < buf + len; p++) {
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if (!ishost(*p)) {
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*p = '\0';
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break;
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}
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}
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s_asprintf(&nhost, "%.*s",
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(int)(buf + len - host), host);
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} else if ((host =
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strnstr(buf, WHOIS_ORG_SERVER_ID, len)) != NULL) {
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host += sizeof(WHOIS_ORG_SERVER_ID) - 1;
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for (p = host; p < buf + len; p++) {
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if (!ishost(*p)) {
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*p = '\0';
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break;
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}
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}
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s_asprintf(&nhost, "%.*s",
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(int)(buf + len - host), host);
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} else if (strcmp(hostname, ANICHOST) == 0) {
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for (c = 0; c <= len; c++)
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buf[c] = tolower((unsigned char)buf[c]);
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for (i = 0; ip_whois[i] != NULL; i++) {
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if (strnstr(buf, ip_whois[i], len) !=
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NULL) {
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s_asprintf(&nhost, "%s",
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ip_whois[i]);
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break;
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}
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}
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}
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}
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}
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fclose(fp);
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if (nhost != NULL) {
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whois(query, nhost, 0);
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free(nhost);
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}
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: whois [-aAbfgiIklmPQr] [-c country-code | -h hostname] "
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"[-p port] name ...\n");
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exit(EX_USAGE);
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}
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