NetBSD/libexec/fingerd/fingerd.c

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/* $NetBSD: fingerd.c,v 1.4 1997/01/20 21:01:30 thorpej Exp $ */
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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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 char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "from: @(#)fingerd.c 8.1 (Berkeley) 6/4/93";
#else
static char rcsid[] = "$NetBSD: fingerd.c,v 1.4 1997/01/20 21:01:30 thorpej Exp $";
#endif
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#endif /* not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <netdb.h>
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#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
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#include "pathnames.h"
void err __P((const char *, ...));
int
main(argc, argv)
int argc;
char *argv[];
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{
register FILE *fp;
register int ch, ac = 2;
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register char *lp;
struct hostent *hp;
struct sockaddr_in sin;
int p[2], logging, secure, user_required, short_list, sval;
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#define ENTRIES 50
char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog;
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prog = _PATH_FINGER;
logging = secure = user_required = short_list = 0;
openlog("fingerd", LOG_PID | LOG_CONS, LOG_DAEMON);
opterr = 0;
while ((ch = getopt(argc, argv, "sluSmpP:")) != EOF)
switch (ch) {
case 'l':
logging = 1;
break;
case 'P':
prog = optarg;
break;
case 's':
secure = 1;
break;
case 'u':
user_required = 1;
break;
case 'S':
short_list = 1;
av[ac++] = "-s";
break;
case 'm':
av[ac++] = "-m";
break;
case 'p':
av[ac++] = "-p";
break;
case '?':
default:
err("illegal option -- %c", ch);
}
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if (logging) {
sval = sizeof(sin);
if (getpeername(0, (struct sockaddr *)&sin, &sval) < 0)
err("getpeername: %s", strerror(errno));
if ((hp = gethostbyaddr((char *)&sin.sin_addr.s_addr,
sizeof(sin.sin_addr.s_addr), AF_INET)))
lp = hp->h_name;
else
lp = inet_ntoa(sin.sin_addr);
syslog(LOG_NOTICE, "query from %s", lp);
}
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if (!fgets(line, sizeof(line), stdin))
exit(1);
av[ac++] = "--";
comp = &av[1];
for (lp = line, ap = &av[ac]; ac < ENTRIES;) {
if ((*ap = strtok(lp, " \t\r\n")) == NULL)
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break;
lp = NULL;
if (secure && strchr(*ap, '@')) {
(void) puts("fowarding service denied\r\n");
exit(1);
}
ch = strlen(*ap);
while ((*ap)[ch-1] == '@')
(*ap)[--ch] = '\0';
if (**ap == '\0')
continue;
/* RFC1196: "/[Ww]" == "-l" */
if ((*ap)[0] == '/' && ((*ap)[1] == 'W' || (*ap)[1] == 'w')) {
if (!short_list) {
av[1] = "-l";
comp = &av[0];
}
} else {
ap++;
ac++;
}
}
av[ENTRIES - 1] = NULL;
if ((lp = strrchr(prog, '/')))
*comp = ++lp;
else
*comp = prog;
if (user_required) {
for (ap = comp + 1; strcmp("--", *(ap++)); );
if (*ap == NULL) {
(void) puts("must provide username\r\n");
exit(1);
}
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}
if (pipe(p) < 0)
err("pipe: %s", strerror(errno));
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switch(vfork()) {
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case 0:
(void) close(p[0]);
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if (p[1] != 1) {
(void) dup2(p[1], 1);
(void) close(p[1]);
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}
execv(prog, comp);
err("execv: %s: %s", prog, strerror(errno));
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_exit(1);
case -1:
err("fork: %s", strerror(errno));
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}
(void) close(p[1]);
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if (!(fp = fdopen(p[0], "r")))
err("fdopen: %s", strerror(errno));
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while ((ch = getc(fp)) != EOF) {
if (ch == '\n')
putchar('\r');
putchar(ch);
}
exit(0);
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
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void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void) vsyslog(LOG_ERR, fmt, ap);
va_end(ap);
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exit(1);
/* NOTREACHED */
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}