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42ab40e52d
server may not return a new line character on the final line. o Remove the whois.networksolutions.com fallback code, which is no longer needed. o Instead of determining a hostname by terminating it when we see whitespace, only allow hostname characters and terminate the string when it's not such a character. o Add a small optimization in a for loop. PR: 30968 Reviewed by: -audit MFC after: 4 days
324 lines
8.1 KiB
C
324 lines
8.1 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)whois.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/socket.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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#define NICHOST "whois.crsnic.net"
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#define INICHOST "whois.networksolutions.com"
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#define DNICHOST "whois.nic.mil"
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#define GNICHOST "whois.nic.gov"
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#define ANICHOST "whois.arin.net"
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#define RNICHOST "whois.ripe.net"
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#define PNICHOST "whois.apnic.net"
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#define MNICHOST "whois.ra.net"
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#define QNICHOST_TAIL ".whois-servers.net"
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#define SNICHOST "whois.6bone.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_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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const char *ip_whois[] = { RNICHOST, PNICHOST, NULL };
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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 exit_on_error);
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static void s_asprintf(char **ret, const char *format, ...);
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static void usage(void);
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static void whois(char *, struct addrinfo *, int);
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int
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main(int argc, char *argv[])
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{
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struct addrinfo *res;
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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, "aAc:dgh:imp:QrR6")) != -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 'c':
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country = optarg;
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break;
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case 'd':
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host = DNICHOST;
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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 '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 '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 'R':
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warnx("-R is deprecated; use '-c ru' instead");
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country = "ru";
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break;
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case '6':
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host = SNICHOST;
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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 determine the top level domain
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* from the query. If the TLD is a number, query ARIN. Otherwise, use
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* TLD.whois-server.net. If the domain does not contain '.', fall
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* back to NICHOST.
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*/
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if (host == NULL && country == 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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while (argc--) {
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if (country != NULL) {
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s_asprintf(&qnichost, "%s%s", country, QNICHOST_TAIL);
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res = gethostinfo(qnichost, 1);
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} else if (use_qnichost)
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if ((qnichost = choose_server(*argv)) != NULL)
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res = gethostinfo(qnichost, 1);
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if (qnichost == NULL)
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res = gethostinfo(host, 1);
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free(qnichost);
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qnichost = NULL;
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whois(*argv++, res, flags);
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freeaddrinfo(res);
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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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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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for (pos = strchr(domain, '\0'); pos > domain && *--pos == '.';)
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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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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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else
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s_asprintf(&retval, "%s%s", pos, QNICHOST_TAIL);
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return (retval);
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}
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static struct addrinfo *
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gethostinfo(char const *host, int exit_on_error)
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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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error = getaddrinfo(host, port, &hints, &res);
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if (error) {
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warnx("%s: %s", host, gai_strerror(error));
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if (exit_on_error)
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exit(EX_NOHOST);
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return (NULL);
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}
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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(char *name, struct addrinfo *res, int flags)
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{
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FILE *sfi, *sfo;
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struct addrinfo *res2;
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char *buf, *host, *nhost, *p;
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int i, s;
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size_t len;
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for (; res; res = res->ai_next) {
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s = socket(res->ai_family, res->ai_socktype, 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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break;
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close(s);
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}
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if (res == NULL)
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err(EX_OSERR, "connect()");
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sfi = fdopen(s, "r");
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sfo = fdopen(s, "w");
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if (sfi == NULL || sfo == NULL)
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err(EX_OSERR, "fdopen()");
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fprintf(sfo, "%s\r\n", name);
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fflush(sfo);
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nhost = NULL;
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while ((buf = fgetln(sfi, &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 {
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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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if (nhost != NULL) {
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if ((res2 = gethostinfo(nhost, 0)) == NULL) {
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free(nhost);
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return;
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}
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free(nhost);
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whois(name, res2, 0);
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freeaddrinfo(res2);
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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 [-adgimpQrR6] [-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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