135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* Copyright (c) 1993 Christopher G. Demetriou
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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
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char rcsid[] = "$Header: /cvsroot/src/usr.sbin/rwalld/Attic/rwalld.c,v 1.2 1993/04/10 17:59:30 cgd Exp $";
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#endif
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#include <unistd.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <rpc/rpc.h>
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#include <rpcsvc/rwall.h>
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extern void wallprog_1();
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void possess();
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void killkids();
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main(argc, argv)
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int argc;
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char *argv[];
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{
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SVCXPRT *transp;
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int s, salen, nodaemon = 0;
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struct sockaddr_in sa;
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if (argc == 2 && !strcmp(argv[1], "-n"))
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nodaemon = 1;
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if (argc != 1 && !nodaemon) {
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printf("usage: %s [-n]\n", argv[0]);
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exit(1);
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}
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if (geteuid() == 0) {
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struct passwd *pep = getpwnam("nobody");
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if (pep)
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setuid(pep->pw_uid);
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else
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setuid(getuid());
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}
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if (!nodaemon)
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possess();
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signal(SIGCHLD, killkids);
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if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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exit(1);
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if (bind(s, (struct sockaddr *)&sa, sizeof sa) < 0)
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exit(1);
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salen = sizeof sa;
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if (getsockname(s, (struct sockaddr *)&sa, &salen))
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exit(1);
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(void)pmap_unset(WALLPROG, WALLVERS);
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pmap_set(WALLPROG, WALLVERS, IPPROTO_UDP, ntohs(sa.sin_port));
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if (dup2(s, 0) < 0)
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exit(1);
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transp = svcudp_create(RPC_ANYSOCK);
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if (transp == NULL) {
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(void)fprintf(stderr, "cannot create udp service.\n");
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exit(1);
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}
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(void)pmap_unset(WALLPROG, WALLVERS);
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if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, IPPROTO_UDP)) {
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(void)fprintf(stderr, "unable to register (WALLPROG, WALLVERS, udp).\n");
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exit(1);
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}
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svc_run();
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(void)fprintf(stderr, "svc_run returned\n");
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exit(1);
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}
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void possess()
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{
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daemon(0, 0);
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}
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void killkids()
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{
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while(wait4(-1, NULL, WNOHANG, NULL) > 0)
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;
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}
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void *wallproc_wall_1(s)
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char **s;
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{
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/* fork, popen wall with special option, and send the message */
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if (fork() == 0) {
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FILE *pfp;
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pfp = popen("/usr/bin/wall -n", "w");
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if (pfp != NULL) {
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fprintf(pfp, "\007\007%s", *s);
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pclose(pfp);
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exit(0);
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}
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}
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}
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