1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1993 Christopher G. Demetriou
5 * Copyright (c) 1988, 1990 Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1988 Regents of the University of California.\n\
40 All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44static const char sccsid[] = "from: @(#)wall.c	5.14 (Berkeley) 3/2/91";
45#endif
46
47#include <sys/cdefs.h>
48__FBSDID("$FreeBSD$");
49
50/*
51 * This program is not related to David Wall, whose Stanford Ph.D. thesis
52 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
53 */
54
55#include <sys/param.h>
56#include <sys/stat.h>
57#include <sys/uio.h>
58#include <rpc/rpc.h>
59#include <rpcsvc/rwall.h>
60#include <err.h>
61#include <paths.h>
62#include <pwd.h>
63#include <stdio.h>
64#include <stdlib.h>
65#include <string.h>
66#include <time.h>
67#include <unistd.h>
68
69static char *mbuf;
70
71static char notty[] = "no tty";
72
73static void	makemsg(const char *);
74static void usage(void);
75
76/* ARGSUSED */
77int
78main(int argc, char *argv[])
79{
80	char *wallhost, res;
81	CLIENT *cl;
82	struct timeval tv;
83
84	if ((argc < 2) || (argc > 3))
85		usage();
86
87	wallhost = argv[1];
88
89	makemsg(argv[2]);
90
91	/*
92	 * Create client "handle" used for calling MESSAGEPROG on the
93	 * server designated on the command line. We tell the rpc package
94	 * to use the "tcp" protocol when contacting the server.
95	*/
96	cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
97	if (cl == NULL) {
98		/*
99		 * Couldn't establish connection with server.
100		 * Print error message and die.
101		 */
102		errx(1, "%s", clnt_spcreateerror(wallhost));
103	}
104
105	tv.tv_sec = 15;		/* XXX ?? */
106	tv.tv_usec = 0;
107	if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf,
108	    (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) {
109		/*
110		 * An error occurred while calling the server.
111		 * Print error message and die.
112		 */
113		errx(1, "%s", clnt_sperror(cl, wallhost));
114	}
115
116	return (0);
117}
118
119static void
120usage(void)
121{
122	fprintf(stderr, "usage: rwall host [file]\n");
123	exit(1);
124}
125
126static void
127makemsg(const char *fname)
128{
129	struct tm *lt;
130	struct passwd *pw;
131	struct stat sbuf;
132	time_t now;
133	FILE *fp;
134	int fd;
135	size_t mbufsize;
136	char *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
137	const char *whom;
138
139	snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
140	if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL)
141		err(1, "can't open temporary file");
142	unlink(tmpname);
143
144	whom = getlogin();
145	if (!whom) {
146		pw = getpwuid(getuid());
147		whom = pw ? pw->pw_name : "???";
148	}
149	gethostname(hostname, sizeof(hostname));
150	time(&now);
151	lt = localtime(&now);
152
153	/*
154	 * all this stuff is to blank out a square for the message;
155	 * we wrap message lines at column 79, not 80, because some
156	 * terminals wrap after 79, some do not, and we can't tell.
157	 * Which means that we may leave a non-blank character
158	 * in column 80, but that can't be helped.
159	 */
160	fprintf(fp, "Remote Broadcast Message from %s@%s\n",
161	    whom, hostname);
162	tty = ttyname(STDERR_FILENO);
163	if (tty == NULL)
164		tty = notty;
165	fprintf(fp, "        (%s) at %d:%02d ...\n", tty,
166	    lt->tm_hour, lt->tm_min);
167
168	putc('\n', fp);
169
170	if (fname && !(freopen(fname, "r", stdin)))
171		err(1, "can't read %s", fname);
172	while (fgets(lbuf, sizeof(lbuf), stdin))
173		fputs(lbuf, fp);
174	rewind(fp);
175
176	if (fstat(fd, &sbuf))
177		err(1, "can't stat temporary file");
178	mbufsize = (size_t)sbuf.st_size;
179	mbuf = malloc(mbufsize);
180	if (mbuf == NULL)
181		err(1, "out of memory");
182	if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize)
183		err(1, "can't read temporary file");
184	close(fd);
185}
186