NetBSD/libexec/fingerd/fingerd.c

228 lines
5.4 KiB
C

/* $NetBSD: fingerd.c,v 1.20 2003/08/07 09:46:38 agc Exp $ */
/*
* Copyright (c) 1983, 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.
* 3. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)fingerd.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: fingerd.c,v 1.20 2003/08/07 09:46:38 agc Exp $");
#endif
#endif /* not lint */
#include <sys/param.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>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pathnames.h"
void err __P((const char *, ...));
int main __P((int, char *[]));
int
main(argc, argv)
int argc;
char *argv[];
{
register FILE *fp;
register int ch, ac = 2;
register char *lp = NULL /* XXX gcc */;
struct sockaddr_storage ss;
int p[2], logging, no_forward, user_required, short_list, sval;
#define ENTRIES 50
char **ap, *av[ENTRIES + 1], **comp, line[1024], *prog, *s;
char hostbuf[MAXHOSTNAMELEN];
prog = _PATH_FINGER;
logging = no_forward = user_required = short_list = 0;
openlog("fingerd", LOG_PID, LOG_DAEMON);
opterr = 0;
while ((ch = getopt(argc, argv, "gsluShmpP:8")) != -1)
switch (ch) {
case 'l':
logging = 1;
break;
case 'P':
prog = optarg;
break;
case 's':
no_forward = 1;
break;
case 'u':
user_required = 1;
break;
case 'S':
short_list = 1;
av[ac++] = "-s";
break;
case 'h':
av[ac++] = "-h";
break;
case 'm':
av[ac++] = "-m";
break;
case 'p':
av[ac++] = "-p";
break;
case 'g':
av[ac++] = "-g";
break;
case '8':
av[ac++] = "-8";
break;
case '?':
default:
err("illegal option -- %c", ch);
}
if (logging) {
sval = sizeof(ss);
if (getpeername(0, (struct sockaddr *)&ss, &sval) < 0)
err("getpeername: %s", strerror(errno));
(void)getnameinfo((struct sockaddr *)&ss, sval,
hostbuf, sizeof(hostbuf), NULL, 0, 0);
lp = hostbuf;
}
if (!fgets(line, sizeof(line), stdin)) {
if (logging)
syslog(LOG_NOTICE, "query from %s", lp);
exit(1);
}
while ((s = strrchr(line, '\n')) != NULL ||
(s = strrchr(line, '\r')) != NULL)
*s = '\0';
if (logging) {
if (*line == '\0')
syslog(LOG_NOTICE, "query from %s", lp);
else
syslog(LOG_NOTICE, "query from %s: %s", lp, line);
}
av[ac++] = "--";
comp = &av[1];
for (lp = line, ap = &av[ac]; ac < ENTRIES;) {
if ((*ap = strtok(lp, " \t\r\n")) == NULL)
break;
lp = NULL;
if (no_forward && strchr(*ap, '@')) {
(void) puts("forwarding 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);
}
}
if (pipe(p) < 0)
err("pipe: %s", strerror(errno));
switch(fork()) {
case 0:
(void) close(p[0]);
if (p[1] != 1) {
(void) dup2(p[1], 1);
(void) close(p[1]);
}
execv(prog, comp);
err("execv: %s: %s", prog, strerror(errno));
_exit(1);
case -1:
err("fork: %s", strerror(errno));
}
(void) close(p[1]);
if (!(fp = fdopen(p[0], "r")))
err("fdopen: %s", strerror(errno));
while ((ch = getc(fp)) != EOF) {
if (ch == '\n')
putchar('\r');
putchar(ch);
}
exit(0);
}
void
err(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
(void) vsyslog(LOG_ERR, fmt, ap);
va_end(ap);
exit(1);
/* NOTREACHED */
}