2 * Copyright (c) 1993 Christopher G. Demetriou
3 * Copyright (c) 1988, 1990 Regents of the University of California.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
34 * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved.
35 * @(#)wall.c 5.14 (Berkeley) 3/2/91
36 * $FreeBSD: src/usr.bin/rwall/rwall.c,v 1.8.2.1 2001/02/18 02:27:54 kris Exp $
37 * $DragonFly: src/usr.bin/rwall/rwall.c,v 1.4 2004/09/15 19:58:05 joerg Exp $
41 * This program is not related to David Wall, whose Stanford Ph.D. thesis
42 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
45 #include <sys/param.h>
60 #include <rpcsvc/rwall.h>
62 static size_t mbufsize;
65 static void makemsg(char *);
66 static void usage(void);
69 main(int argc, char **argv)
76 while ((c = getopt(argc, argv, "")) != -1) {
86 if (argc < 1 || argc > 2)
94 * Create client "handle" used for calling MESSAGEPROG on the
95 * server designated on the command line. We tell the rpc package
96 * to use the "tcp" protocol when contacting the server.
98 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
101 * Couldn't establish connection with server.
102 * Print error message and die.
104 clnt_pcreateerror(wallhost);
108 tv.tv_sec = 15; /* XXX ?? */
110 if (clnt_call(cl, WALLPROC_WALL, xdr_wrapstring, &mbuf, xdr_void,
111 &res, tv) != RPC_SUCCESS) {
113 * An error occurred while calling the server.
114 * Print error message and die.
116 clnt_perror(cl, wallhost);
126 fprintf(stderr, "usage: rwall hostname [file]\n");
139 char hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
140 const char *whom, *tty;
142 snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
143 if ((fd = mkstemp(tmpname)) == -1 || (fp = fdopen(fd, "r+")) == NULL)
144 err(1, "can't open temporary file");
146 if (unlink(tmpname) == -1)
147 err(1, "unlink failed");
149 if ((whom = getlogin()) == NULL)
150 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
151 gethostname(hostname, sizeof(hostname));
154 lt = localtime(&now);
157 * all this stuff is to blank out a square for the message;
158 * we wrap message lines at column 79, not 80, because some
159 * terminals wrap after 79, some do not, and we can't tell.
160 * Which means that we may leave a non-blank character
161 * in column 80, but that can't be helped.
163 fprintf(fp, "Remote Broadcast Message from %s@%s\n", whom, hostname);
164 tty = ttyname(STDERR_FILENO);
167 fprintf(fp, " (%s) at %d:%02d ...\n", tty,
168 lt->tm_hour, lt->tm_min);
172 if (fname && !(freopen(fname, "r", stdin)))
173 err(1, "can't read %s", fname);
174 while (fgets(lbuf, sizeof(lbuf), stdin))
178 if (fstat(fd, &sbuf))
179 err(1, "can't stat temporary file");
180 mbufsize = (size_t)sbuf.st_size;
181 if ((mbuf = malloc(mbufsize)) == NULL)
182 err(1, "out of memory");
183 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
184 err(1, "can't read temporary file");
186 warn("close failed");