rwalld from FreeBSD 1.1.5.1

Reviewed by:	Geoff
Submitted by:	Christopher G. Demetriou

3 files changed, 286 insertions, 0 deletions

diff --git a/libexec/rpc.rwalld/Makefile b/libexec/rpc.rwalld/Makefile
new file mode 100644
index 0000000..5d7b492
--- /dev/null
+++ b/libexec/rpc.rwalld/Makefile
@@ -0,0 +1,10 @@
+#	$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>
diff --git a/libexec/rpc.rwalld/rpc.rwalld.8 b/libexec/rpc.rwalld/rpc.rwalld.8
new file mode 100644
index 0000000..eadadf4
--- /dev/null
+++ b/libexec/rpc.rwalld/rpc.rwalld.8
@@ -0,0 +1,67 @@
+.\" -*- 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
diff --git a/libexec/rpc.rwalld/rwalld.c b/libexec/rpc.rwalld/rwalld.c
new file mode 100644
index 0000000..22c3fef
--- /dev/null
+++ b/libexec/rpc.rwalld/rwalld.c
@@ -0,0 +1,209 @@
+/*
+ * 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);
+}