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/* $OpenBSD: rusersd.c,v 1.16 2009/10/27 23:59:31 deraadt Exp $ */
/*-
* Copyright (c) 1993 John Brezak
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `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 AUTHOR 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/types.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <pwd.h>
#include <syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/rusers.h> /* New version */
#include <rpcsvc/rnusers.h> /* Old version */
#include <rpc/pmap_clnt.h>
#include <utmp.h>
extern void rusers_service(struct svc_req *, SVCXPRT *);
int from_inetd = 1;
int utmp_fd;
/* ARGSUSED */
static void
cleanup(int signo)
{
(void) pmap_unset(RUSERSPROG, RUSERSVERS_3); /* XXX signal races */
(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE);
(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG);
_exit(0);
}
int
main(int argc, char *argv[])
{
int sock = 0, proto = 0;
socklen_t fromlen;
struct sockaddr_storage from;
struct passwd *pw;
SVCXPRT *transp;
if ((utmp_fd = open(_PATH_UTMP, O_RDONLY)) == -1) {
syslog(LOG_ERR, "cannot open %s", _PATH_UTMP);
exit(1);
}
openlog("rpc.rusersd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON);
pw = getpwnam("_rusersd");
if (!pw)
pw = getpwnam("nobody");
if (chroot("/var/empty") == -1) {
syslog(LOG_ERR, "cannot chdir to /var/empty.");
exit(1);
}
chdir("/");
if (pw) {
setgroups(1, &pw->pw_gid);
setegid(pw->pw_gid);
setgid(pw->pw_gid);
seteuid(pw->pw_uid);
setuid(pw->pw_uid);
}
/*
* See if inetd started us
*/
fromlen = sizeof(from);
if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) {
from_inetd = 0;
sock = RPC_ANYSOCK;
proto = IPPROTO_UDP;
}
if (!from_inetd) {
daemon(0, 0);
(void) pmap_unset(RUSERSPROG, RUSERSVERS_3);
(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE);
(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG);
(void) signal(SIGINT, cleanup);
(void) signal(SIGTERM, cleanup);
(void) signal(SIGHUP, cleanup);
}
transp = svcudp_create(sock);
if (transp == NULL) {
syslog(LOG_ERR, "cannot create udp service.");
exit(1);
}
if (!svc_register(transp, RUSERSPROG, RUSERSVERS_3, rusers_service, proto)) {
syslog(LOG_ERR,
"unable to register (RUSERSPROG, RUSERSVERS_3, %s).",
proto ? "udp" : "(inetd)");
exit(1);
}
if (!svc_register(transp, RUSERSPROG, RUSERSVERS_IDLE, rusers_service, proto)) {
syslog(LOG_ERR,
"unable to register (RUSERSPROG, RUSERSVERS_IDLE, %s).",
proto ? "udp" : "(inetd)");
exit(1);
}
if (!svc_register(transp, RUSERSPROG, RUSERSVERS_ORIG, rusers_service, proto)) {
syslog(LOG_ERR,
"unable to register (RUSERSPROG, RUSERSVERS_ORIG, %s).",
proto ? "udp" : "(inetd)");
exit(1);
}
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
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