original, by cgd

usr.sbin/rwalld/Makefile

@@ -0,0 +1,23 @@
+#
+# a makefile for /usr/sbin/rwalld
+#
+#	$Header: /cvsroot/src/usr.sbin/rwalld/Attic/Makefile,v 1.1 1993/04/04 19:01:05 cgd Exp $
+#
+
+PROG = rwalld
+SRCS = rwalld.c rwall_svc.c
+CLEANFILES += rwall_svc.c
+NOMAN=	noman
+
+RPCCOM = rpcgen
+RPCDLOC= /usr/include
+RPCDESC= rpcsvc/rwall.x
+
+DPADD=	${LIBRPC}
+LDADD=	-lrpc
+
+rwall_svc.c: ${RPCDLOC}/${RPCDESC}
+	@echo generating $@...
+	@PWD=`pwd` ; cd ${RPCDLOC} ; ${RPCCOM} -m ${RPCDESC} -o $$PWD/$@
+
+.include <bsd.prog.mk>

usr.sbin/rwalld/rwalld.c

@@ -0,0 +1,145 @@
+/*
+ * 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[] = "$Header: /cvsroot/src/usr.sbin/rwalld/Attic/rwalld.c,v 1.1 1993/04/04 19:01:06 cgd Exp $";
+#endif
+
+#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>
+
+extern void wallprog_1();
+
+void possess();
+void killkids();
+
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	SVCXPRT *transp;
+	int s, salen, nodaemon = 0;
+	struct sockaddr_in sa;
+
+	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());
+	}
+
+	if (!nodaemon)
+		possess();
+	signal(SIGCHLD, killkids);
+
+	if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+		exit(1);
+
+	if (bind(s, (struct sockaddr *)&sa, sizeof sa) < 0)
+		exit(1);
+
+	salen = sizeof sa;
+	if (getsockname(s, (struct sockaddr *)&sa, &salen))
+		exit(1);
+
+	(void)pmap_unset(WALLPROG, WALLVERS);
+	pmap_set(WALLPROG, WALLVERS, IPPROTO_UDP, ntohs(sa.sin_port));
+	if (dup2(s, 0) < 0)
+		exit(1);
+
+	transp = svcudp_create(RPC_ANYSOCK);
+	if (transp == NULL) {
+		(void)fprintf(stderr, "cannot create udp service.\n");
+		exit(1);
+	}
+	(void)pmap_unset(WALLPROG, WALLVERS);
+	if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, IPPROTO_UDP)) {
+		(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()
+{
+	int nfds = getdtablesize();
+	int p = fork();
+
+	if (p < 0) {
+		perror("walld: couldn't fork");
+		exit(1);
+	} else if (p > 0) {
+		exit(0);
+	}
+
+	for (nfds--; nfds >= 0; nfds--)
+		close(nfds);
+}
+
+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("/usr/bin/wall -n", "w");
+		if (pfp != NULL) {
+			fprintf(pfp, "\007\007%s", *s);
+			pclose(pfp);
+			exit(0);
+		}
+	}
+}