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rwalld from FreeBSD 1.1.5.1

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Reviewed by:	Geoff
Submitted by:	Christopher G. Demetriou
This commit is contained in:
Geoff Rehmet 1994-08-28 14:58:36 +00:00
parent 415bccaa8d
commit 935a002483
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/cvs2svn/branches/FBSD_1/; revision=2341
3 changed files with 286 additions and 0 deletions
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10
libexec/rpc.rwalld/Makefile Normal file
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# $Id: Makefile,v 1.2 1993/11/10 03:46:23 smace Exp $
PROG = rpc.rwalld
SRCS = rwalld.c
MAN8 = rpc.rwalld.8
DPADD= ${LIBRPCSVC} ${LIBUTIL}
LDADD= -lrpcsvc -lutil
.include <bsd.prog.mk>

67
libexec/rpc.rwalld/rpc.rwalld.8 Normal file
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.\" -*- nroff -*-
.\"
.\" Copyright (c) 1985, 1991 The Regents of the University of California.
.\" 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 by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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: rpc.rwalld.8,v 1.1 1993/09/16 00:36:43 jtc Exp $
.\"
.Dd June 7, 1993
.Dt RPC.RWALLD 8
.Os BSD 4.3
.Sh NAME
.Nm rpc.rwalld
.Nd write messages to users currently logged in server
.Sh SYNOPSIS
.Nm /usr/libexec/rpc.rwalld
.Sh DESCRIPTION
.Nm rpc.rwalld
is a server which will send a message to users
currently logged in to the system. This server
invokes the
.Xr wall 1
command to actually write the messages to the
system.
.Pp
Messages are sent to this server by the
.Xr rwall 1
command.
The
.Nm rpc.rwalld
daemon is normally invoked by
.Xr inetd 8 .
.Pp
.Nm rpc.rwalld
uses an RPC protocol defined in
.Pa /usr/include/rpcsvc/rwall.x .
.Sh SEE ALSO
.Xr rwall 1 ,
.Xr wall 1 ,
.Xr inetd 8

209
libexec/rpc.rwalld/rwalld.c Normal file
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/*
* 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[] = "$Id: rwalld.c,v 1.1 1993/09/16 00:36:44 jtc Exp $";
#endif /* not lint */
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <stdio.h>
#include <string.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
void wallprog_1();
void possess();
void killkids();
int nodaemon = 0;
int from_inetd = 1;
main(argc, argv)
int argc;
char *argv[];
{
SVCXPRT *transp;
int s, salen;
struct sockaddr_in sa;
int sock = 0;
int proto = 0;
if (argc == 2 && !strcmp(argv[1], "-n"))
nodaemon = 1;
if (argc != 1 && !nodaemon) {
printf("usage: %s [-n]\n", argv[0]);
exit(1);
}
if (geteuid() == 0) {
struct passwd *pep = getpwnam("nobody");
if (pep)
setuid(pep->pw_uid);
else
setuid(getuid());
}
/*
* See if inetd started us
*/
if (getsockname(0, (struct sockaddr *)&sa, &salen) < 0) {
from_inetd = 0;
sock = RPC_ANYSOCK;
proto = IPPROTO_UDP;
}
if (!from_inetd) {
if (!nodaemon)
possess();
(void)pmap_unset(WALLPROG, WALLVERS);
if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
perror("socket");
exit(1);
}
bzero((char *)&sa, sizeof sa);
if (bind(s, (struct sockaddr *)&sa, sizeof sa) < 0) {
perror("bind");
exit(1);
}
salen = sizeof sa;
if (getsockname(s, (struct sockaddr *)&sa, &salen)) {
perror("getsockname");
exit(1);
}
pmap_set(WALLPROG, WALLVERS, IPPROTO_UDP, ntohs(sa.sin_port));
if (dup2(s, 0) < 0) {
perror("dup2");
exit(1);
}
(void)pmap_unset(WALLPROG, WALLVERS);
}
(void)signal(SIGCHLD, killkids);
transp = svcudp_create(sock);
if (transp == NULL) {
(void)fprintf(stderr, "cannot create udp service.\n");
exit(1);
}
if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, proto)) {
(void)fprintf(stderr, "unable to register (WALLPROG, WALLVERS, udp).\n");
exit(1);
}
svc_run();
(void)fprintf(stderr, "svc_run returned\n");
exit(1);
}
void possess()
{
daemon(0, 0);
}
void killkids()
{
while(wait4(-1, NULL, WNOHANG, NULL) > 0)
;
}
void *wallproc_wall_1(s)
char **s;
{
/* 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);
}
}
}
void
wallprog_1(rqstp, transp)
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, xdr_void, (char *)NULL);
goto leave;
case WALLPROC_WALL:
xdr_argument = xdr_wrapstring;
xdr_result = xdr_void;
local = (char *(*)()) wallproc_wall_1;
break;
default:
svcerr_noproc(transp);
goto leave;
}
bzero((char *)&argument, sizeof(argument));
if (!svc_getargs(transp, xdr_argument, &argument)) {
svcerr_decode(transp);
goto leave;
}
result = (*local)(&argument, rqstp);
if (result != NULL && !svc_sendreply(transp, xdr_result, result)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, xdr_argument, &argument)) {
(void)fprintf(stderr, "unable to free arguments\n");
exit(1);
}
leave:
if (from_inetd)
exit(0);
}