SecBSD 1.3 -current: The Digital Resistance. A belief in the importance of privacy and the right to secure communication.

libexec/rpc.rwalld/Makefile

@@ -0,0 +1,10 @@
+#	$OpenBSD: Makefile,v 1.3 2016/03/30 06:38:43 jmc Exp $
+
+PROG =	rpc.rwalld
+SRCS =	rwalld.c
+MAN =	rpc.rwalld.8
+
+DPADD=	${LIBRPCSVC}
+LDADD=	-lrpcsvc
+
+.include <bsd.prog.mk>

libexec/rpc.rwalld/rpc.rwalld.8

@@ -0,0 +1,63 @@
+.\"	$OpenBSD: rpc.rwalld.8,v 1.7 2007/05/31 19:19:40 jmc Exp $
+.\"
+.\" 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. 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 1.7 2007/05/31 19:19:40 jmc Exp $
+.\"
+.Dd $Mdocdate: May 31 2007 $
+.Dt RPC.RWALLD 8
+.Os
+.Sh NAME
+.Nm rwalld ,
+.Nm rpc.rwalld
+.Nd write messages to users currently logged in server
+.Sh SYNOPSIS
+.Nm 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

libexec/rpc.rwalld/rwalld.c

@@ -0,0 +1,172 @@
+/*	$OpenBSD: rwalld.c,v 1.17 2019/06/28 13:32:53 deraadt 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. 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/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <pwd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <rpc/rpc.h>
+#include <rpcsvc/rwall.h>
+
+#define WALL_CMD "/usr/bin/wall -n"
+
+void wallprog_1(struct svc_req *, SVCXPRT *);
+
+int from_inetd = 1;
+
+static void
+cleanup(int signo)
+{
+	(void) pmap_unset(WALLPROG, WALLVERS);		/* XXX signal race */
+	_exit(0);
+}
+
+int
+main(int argc, char *argv[])
+{
+	int sock = 0, proto = 0;
+	socklen_t fromlen;
+	struct sockaddr_storage from;
+	SVCXPRT *transp;
+
+	struct passwd *pw = getpwnam("_rwalld");
+	if (pw == NULL) {
+		syslog(LOG_ERR, "no such user _rwalld");
+		exit(1);
+	}
+
+	setgroups(1, &pw->pw_gid);
+	setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid);
+	setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid);
+
+	/*
+	 * See if inetd started us
+	 */
+	fromlen = sizeof(from);
+	if (getsockname(0, (struct sockaddr *)&from, &fromlen) == -1) {
+		from_inetd = 0;
+		sock = RPC_ANYSOCK;
+		proto = IPPROTO_UDP;
+	}
+
+	if (!from_inetd) {
+		daemon(0, 0);
+
+		(void) pmap_unset(WALLPROG, WALLVERS);
+
+		(void) signal(SIGINT, cleanup);
+		(void) signal(SIGTERM, cleanup);
+		(void) signal(SIGHUP, cleanup);
+	}
+
+	openlog("rpc.rwalld", LOG_CONS|LOG_PID, LOG_DAEMON);
+
+	transp = svcudp_create(sock);
+	if (transp == NULL) {
+		syslog(LOG_ERR, "cannot create udp service.");
+		exit(1);
+	}
+	if (!svc_register(transp, WALLPROG, WALLVERS, wallprog_1, proto)) {
+		syslog(LOG_ERR, "unable to register (WALLPROG, WALLVERS, %s).",
+		    proto ? "udp" : "(inetd)");
+		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);
+}
+
+void
+wallprog_1(struct svc_req *rqstp, SVCXPRT *transp)
+{
+	char *(*local)(char **, struct svc_req *);
+	xdrproc_t xdr_argument, xdr_result;
+	union {
+		char *wallproc_wall_1_arg;
+	} argument;
+	char *result;
+
+	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 *(*)(char **, struct svc_req *))
+		    wallproc_wall_1_svc;
+		break;
+
+	default:
+		svcerr_noproc(transp);
+		goto leave;
+	}
+	bzero((char *)&argument, 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);
+}