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. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * @(#) Copyright (c) 1988 Regents of the University of California. All rights reserved.
31 * @(#)wall.c 5.14 (Berkeley) 3/2/91
32 * $FreeBSD: src/usr.bin/rwall/rwall.c,v 1.14 2005/05/21 09:55:08 ru Exp $
33 * $DragonFly: src/usr.bin/rwall/rwall.c,v 1.7 2005/07/30 16:44:12 liamfoy Exp $
37 * This program is not related to David Wall, whose Stanford Ph.D. thesis
38 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
41 #include <sys/types.h>
42 #include <sys/param.h>
54 #include <rpcsvc/rwall.h>
58 static void makemsg(const char *);
59 static void usage(void);
62 main(int argc, char **argv)
70 while ((c = getopt(argc, argv, "")) != -1) {
80 if (argc < 1 || argc > 2)
86 * Create client "handle" used for calling MESSAGEPROG on the
87 * server designated on the command line. We tell the rpc package
88 * to use the "tcp" protocol when contacting the server.
90 cl = clnt_create(wallhost, WALLPROG, WALLVERS, "udp");
93 * Couldn't establish connection with server.
94 * Print error message and die.
96 clnt_pcreateerror(wallhost);
102 tv.tv_sec = 15; /* XXX ?? */
104 if (clnt_call(cl, WALLPROC_WALL, (xdrproc_t)xdr_wrapstring, &mbuf,
105 (xdrproc_t)xdr_void, &res, tv) != RPC_SUCCESS) {
107 * An error occurred while calling the server.
108 * Print error message and die.
110 clnt_perror(cl, wallhost);
120 fprintf(stderr, "usage: rwall host [file]\n");
125 makemsg(const char *fname)
134 char hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[MAXPATHLEN];
135 const char *whom, *tty;
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");
141 if (unlink(tmpname) == -1)
142 err(1, "unlink failed: %s", tmpname);
144 if ((whom = getlogin()) == NULL)
145 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
146 gethostname(hostname, sizeof(hostname));
149 lt = localtime(&now);
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.
158 fprintf(fp, "Remote Broadcast Message from %s@%s\n", whom, hostname);
159 tty = ttyname(STDERR_FILENO);
162 fprintf(fp, " (%s) at %d:%02d ...\n", tty,
163 lt->tm_hour, lt->tm_min);
167 if (fname && !(freopen(fname, "r", stdin)))
168 err(1, "can't read %s", fname);
169 while (fgets(lbuf, sizeof(lbuf), stdin))
173 if (fstat(fd, &sbuf))
174 err(1, "can't stat temporary file");
175 mbufsize = (size_t)sbuf.st_size;
176 if ((mbuf = malloc(mbufsize)) == NULL)
177 err(1, "malloc failed");
178 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != (u_int)mbufsize)
179 err(1, "can't read temporary file");
181 warn("close failed");