freebsd-dev/libexec/rpc.rwalld/rwalld.c
Pedro F. Giffuni e6209940de libexec: adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:25:02 +00:00

207 lines
4.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <err.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <arpa/inet.h>
#include <rpc/rpc.h>
#include <rpcsvc/rwall.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#ifdef OSF
#define WALL_CMD "/usr/sbin/wall"
#else
#define WALL_CMD "/usr/bin/wall -n"
#endif
void wallprog_1(struct svc_req *rqstp, SVCXPRT *transp);
void possess(void);
void killkids(int sig);
static void usage(void);
int nodaemon = 0;
int from_inetd = 1;
int
main(int argc, char *argv[])
{
SVCXPRT *transp;
socklen_t salen;
int ok;
struct sockaddr_storage sa;
if (argc == 2 && !strcmp(argv[1], "-n"))
nodaemon = 1;
if (argc != 1 && !nodaemon)
usage();
if (geteuid() == 0) {
struct passwd *pep = getpwnam("nobody");
if (pep)
setuid(pep->pw_uid);
else
setuid(getuid());
}
/*
* See if inetd started us
*/
salen = sizeof(sa);
if (getsockname(0, (struct sockaddr *)&sa, &salen) < 0) {
from_inetd = 0;
}
if (!from_inetd) {
if (!nodaemon)
possess();
(void)rpcb_unset(WALLPROG, WALLVERS, NULL);
}
(void)signal(SIGCHLD, killkids);
openlog("rpc.rwalld", LOG_CONS|LOG_PID, LOG_DAEMON);
/* create and register the service */
if (from_inetd) {
transp = svc_tli_create(0, NULL, NULL, 0, 0);
if (transp == NULL) {
syslog(LOG_ERR, "couldn't create udp service.");
exit(1);
}
ok = svc_reg(transp, WALLPROG, WALLVERS,
wallprog_1, NULL);
} else
ok = svc_create(wallprog_1,
WALLPROG, WALLVERS, "udp");
if (!ok) {
syslog(LOG_ERR, "unable to register (WALLPROG, WALLVERS, %s)", (!from_inetd)?"udp":"(inetd)");
exit(1);
}
svc_run();
syslog(LOG_ERR, "svc_run returned");
exit(1);
}
static void
usage(void)
{
fprintf(stderr, "usage: rpc.rwalld [-n]\n");
exit(1);
}
void
possess(void)
{
daemon(0, 0);
}
void
killkids(int sig __unused)
{
while(wait4(-1, NULL, WNOHANG, NULL) > 0)
;
}
void *
wallproc_wall_1_svc(wrapstring *s, struct svc_req *rqstp __unused)
{
static void *dummy = NULL;
/* fork, popen wall with special option, and send the message */
if (fork() == 0) {
FILE *pfp;
pfp = popen(WALL_CMD, "w");
if (pfp != NULL) {
fprintf(pfp, "\007\007%s", *s);
pclose(pfp);
exit(0);
}
}
return(&dummy);
}
void
wallprog_1(struct svc_req *rqstp, SVCXPRT *transp)
{
union {
char *wallproc_wall_1_arg;
} argument;
char *result;
bool_t (*xdr_argument)(), (*xdr_result)();
char *(*local)();
switch (rqstp->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
goto leave;
case WALLPROC_WALL:
xdr_argument = xdr_wrapstring;
xdr_result = xdr_void;
local = (char *(*)()) wallproc_wall_1_svc;
break;
default:
svcerr_noproc(transp);
goto leave;
}
bzero(&argument, sizeof(argument));
if (!svc_getargs(transp, (xdrproc_t)xdr_argument, &argument)) {
svcerr_decode(transp);
goto leave;
}
result = (*local)(&argument, rqstp);
if (result != NULL &&
!svc_sendreply(transp, (xdrproc_t)xdr_result, result)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, (xdrproc_t)xdr_argument, &argument)) {
syslog(LOG_ERR, "unable to free arguments");
exit(1);
}
leave:
if (from_inetd)
exit(0);
}