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/* $OpenBSD: rusersd.c,v 1.19 2016/09/04 15:03:13 jca Exp $ */ |
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/*- |
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* Copyright (c) 1993 John Brezak |
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* 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. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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* 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, |
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/file.h> |
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#include <stdio.h> |
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#include <signal.h> |
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#include <unistd.h> |
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#include <stdlib.h> |
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#include <pwd.h> |
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#include <syslog.h> |
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#include <rpc/rpc.h> |
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#include <rpcsvc/rusers.h> /* New version */ |
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#include <rpcsvc/rnusers.h> /* Old version */ |
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#include <rpc/pmap_clnt.h> |
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#include <utmp.h> |
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extern void rusers_service(struct svc_req *, SVCXPRT *); |
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int from_inetd = 1; |
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int utmp_fd; |
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/* ARGSUSED */ |
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static void |
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cleanup(int signo) |
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{ |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_3); /* XXX signal races */ |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE); |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG); |
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_exit(0); |
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} |
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int |
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main(int argc, char *argv[]) |
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{ |
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int sock = 0, proto = 0; |
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socklen_t fromlen; |
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struct sockaddr_storage from; |
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struct passwd *pw; |
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SVCXPRT *transp; |
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if ((utmp_fd = open(_PATH_UTMP, O_RDONLY)) == -1) { |
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syslog(LOG_ERR, "cannot open %s", _PATH_UTMP); |
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exit(1); |
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} |
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openlog("rpc.rusersd", LOG_NDELAY|LOG_CONS|LOG_PID, LOG_DAEMON); |
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pw = getpwnam("_rusersd"); |
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if (!pw) { |
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syslog(LOG_ERR, "no such user _rusersd"); |
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exit(1); |
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} |
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if (chroot("/var/empty") == -1) { |
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syslog(LOG_ERR, "cannot chdir to /var/empty."); |
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exit(1); |
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} |
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chdir("/"); |
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setgroups(1, &pw->pw_gid); |
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setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid); |
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setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid); |
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/* |
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* See if inetd started us |
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*/ |
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fromlen = sizeof(from); |
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if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0) { |
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from_inetd = 0; |
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sock = RPC_ANYSOCK; |
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proto = IPPROTO_UDP; |
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} |
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if (!from_inetd) { |
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daemon(0, 0); |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_3); |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_IDLE); |
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(void) pmap_unset(RUSERSPROG, RUSERSVERS_ORIG); |
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(void) signal(SIGINT, cleanup); |
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(void) signal(SIGTERM, cleanup); |
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(void) signal(SIGHUP, cleanup); |
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} |
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transp = svcudp_create(sock); |
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if (transp == NULL) { |
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syslog(LOG_ERR, "cannot create udp service."); |
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exit(1); |
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} |
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_3, rusers_service, proto)) { |
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syslog(LOG_ERR, |
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"unable to register (RUSERSPROG, RUSERSVERS_3, %s).", |
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proto ? "udp" : "(inetd)"); |
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exit(1); |
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} |
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_IDLE, rusers_service, proto)) { |
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syslog(LOG_ERR, |
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"unable to register (RUSERSPROG, RUSERSVERS_IDLE, %s).", |
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proto ? "udp" : "(inetd)"); |
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exit(1); |
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} |
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if (!svc_register(transp, RUSERSPROG, RUSERSVERS_ORIG, rusers_service, proto)) { |
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syslog(LOG_ERR, |
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"unable to register (RUSERSPROG, RUSERSVERS_ORIG, %s).", |
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proto ? "udp" : "(inetd)"); |
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exit(1); |
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} |
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svc_run(); |
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syslog(LOG_ERR, "svc_run returned"); |
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exit(1); |
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} |