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