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freebsd-skq/usr.bin/whois/whois.c

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