NetBSD/libexec/rpc.rwalld/rwalld.c

193 lines
4.9 KiB
C

/* $NetBSD: rwalld.c,v 1.20 2006/05/09 20:18:07 mrg 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the
* NetBSD Project. See http://www.NetBSD.org/ for
* information about NetBSD.
* 4. 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.
*
* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: rwalld.c,v 1.20 2006/05/09 20:18:07 mrg Exp $");
#endif /* not lint */
#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <errno.h>
#include <sys/socket.h>
#include <signal.h>
#include <sys/wait.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
static int from_inetd = 1;
static void cleanup(int);
static void wallprog_1(struct svc_req *, SVCXPRT *);
int main(int, char *[]);
static void
cleanup(int n)
{
(void)rpcb_unset(WALLPROG, WALLVERS, NULL);
exit(0);
}
int
main(int argc, char *argv[])
{
SVCXPRT *transp;
struct sockaddr_storage from;
socklen_t fromlen;
if (geteuid() == 0) {
struct passwd *pep = getpwnam("nobody");
if (pep)
setuid(pep->pw_uid);
else
setuid(getuid());
}
/*
* See if inetd started us
*/
fromlen = sizeof(from);
if (getsockname(0, (struct sockaddr *)&from, &fromlen) < 0)
from_inetd = 0;
if (!from_inetd) {
daemon(0, 0);
(void) rpcb_unset(WALLPROG, WALLVERS, NULL);
(void) signal(SIGINT, cleanup);
(void) signal(SIGTERM, cleanup);
(void) signal(SIGHUP, cleanup);
}
openlog("rpc.rwalld", LOG_PID, LOG_DAEMON);
if (from_inetd) {
transp = svc_dg_create(0, 0, 0);
if (transp == NULL) {
syslog(LOG_ERR, "cannot create udp service.");
exit(1);
}
if (!svc_reg(transp, WALLPROG, WALLVERS, wallprog_1, NULL)) {
syslog(LOG_ERR, "unable to register "
"(WALLPROG, WALLVERS).");
exit(1);
}
} else {
if (!svc_create(wallprog_1, WALLPROG, WALLVERS, "udp")) {
syslog(LOG_ERR, "unable to create "
"(WALLPROG, WALLVERS.)");
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);
}
static void
wallprog_1(struct svc_req *rqstp, SVCXPRT *transp)
{
union {
char *wallproc_wall_1_arg;
} argument;
char *result;
xdrproc_t xdr_argument, xdr_result;
char *(*local) __P((char **, struct svc_req *));
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 *(*) __P((char **, struct svc_req *)))
wallproc_wall_1_svc;
break;
default:
svcerr_noproc(transp);
goto leave;
}
memset((char *)&argument, 0, 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);
}