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/* $OpenBSD: rwalld.c,v 1.9 2002/09/06 19:43:54 deraadt Exp $ */
/*
* Copyright (c) 1993 Christopher G. Demetriou
* 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.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: rwalld.c,v 1.9 2002/09/06 19:43:54 deraadt Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <pwd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <rpc/rpc.h>
#include <rpcsvc/rwall.h>
#ifdef OSF
#define WALL_CMD "/usr/sbin/wall"
#else
#define WALL_CMD "/usr/bin/wall -n"
#endif
void wallprog_1();
int from_inetd = 1;
void
cleanup(int signo)
{
(void) pmap_unset(WALLPROG, WALLVERS); /* XXX signal race */
_exit(0);
}
int
main(int argc, char *argv[])
{
int sock = 0, proto = 0;
socklen_t fromlen;
struct sockaddr_in from;
SVCXPRT *transp;
if (geteuid() == 0) {
struct passwd *pw = getpwnam("nobody");
if (pw) {
setgroups(1, &pw->pw_gid);
setegid(pw->pw_gid);
setgid(pw->pw_gid);
seteuid(pw->pw_uid);
setuid(pw->pw_uid);
} else {
seteuid(getuid());
setuid(getuid());
}
}
/*
* 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(WALLPROG, WALLVERS);
(void) signal(SIGINT, cleanup);
(void) signal(SIGTERM, cleanup);
(void) signal(SIGHUP, cleanup);
}
openlog("rpc.rwalld", LOG_CONS|LOG_PID, LOG_DAEMON);
transp = svcudp_create(sock);
if (transp == NULL) {
syslog(LOG_ERR, "cannot create udp service.");
exit(1);
}
if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, proto)) {
syslog(LOG_ERR, "unable to register (WALLPROG, WALLVERS, %s).",
proto ? "udp" : "(inetd)");
exit(1);
}
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
void *
wallproc_wall_1_svc(char **s, struct svc_req *rqstp)
{
FILE *pfp;
pfp = popen(WALL_CMD, "w");
if (pfp != NULL) {
fprintf(pfp, "\007\007%s", *s);
pclose(pfp);
}
return (*s);
}
void
wallprog_1(struct svc_req *rqstp, SVCXPRT *transp)
{
char *(*local)(char **, struct svc_req *);
xdrproc_t xdr_argument, xdr_result;
union {
char *wallproc_wall_1_arg;
} argument;
char *result;
switch (rqstp->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, xdr_void, (char *)NULL);
goto leave;
case WALLPROC_WALL:
xdr_argument = (xdrproc_t)xdr_wrapstring;
xdr_result = (xdrproc_t)xdr_void;
local = (char *(*)(char **, struct svc_req *))
wallproc_wall_1_svc;
break;
default:
svcerr_noproc(transp);
goto leave;
}
bzero((char *)&argument, sizeof(argument));
if (!svc_getargs(transp, xdr_argument, (caddr_t)&argument)) {
svcerr_decode(transp);
goto leave;
}
result = (*local)((char **)&argument, rqstp);
if (result != NULL && !svc_sendreply(transp, xdr_result, result)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, xdr_argument, (caddr_t)&argument)) {
syslog(LOG_ERR, "unable to free arguments");
exit(1);
}
leave:
if (from_inetd)
exit(0);
}
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