2 * Copyright (c) 1988, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#) Copyright (c) 1988, 1990, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)wall.c 8.2 (Berkeley) 11/16/93
31 * $FreeBSD: src/usr.bin/wall/wall.c,v 1.13.2.6 2001/10/18 08:08:17 des Exp $
32 * $DragonFly: src/usr.bin/wall/wall.c,v 1.4 2005/08/31 16:27:53 liamfoy Exp $
36 * This program is not related to David Wall, whose Stanford Ph.D. thesis
37 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
40 #include <sys/param.h>
55 #include "utmpentry.h"
59 static void makemsg(char *);
60 static void usage(void);
63 struct wallgroup *next;
72 main(int argc, char *argv[])
84 (void)setlocale(LC_CTYPE, "");
86 while ((ch = getopt(argc, argv, "g:n")) != -1)
89 /* undoc option for shutdown: suppress banner */
94 g = (struct wallgroup *)malloc(sizeof *g);
109 for (g = grouplist; g; g = g->next) {
110 grp = getgrnam(g->name);
112 g->gid = grp->gr_gid;
114 warnx("%s: no such group", g->name);
120 iov.iov_len = mbufsize;
122 getutentries(NULL, &ep);
124 for (; ep; ep = ep->next) {
127 pw = getpwnam(ep->name);
130 for (g = grouplist; g && ingroup == 0; g = g->next) {
131 if (g->gid == (gid_t)-1)
133 if (g->gid == pw->pw_gid)
135 else if ((grp = getgrgid(g->gid)) != NULL) {
136 for (np = grp->gr_mem; *np; np++) {
137 if (strcmp(*np, ep->name) == 0) {
147 /* skip [xgk]dm/xserver entries (":0", ":1", etc.) */
148 if (ep->line[0] == ':' && isdigit((unsigned char)ep->line[1]))
151 if ((p = ttymsg(&iov, 1, ep->line, 60*5)) != NULL)
160 (void)fprintf(stderr, "usage: wall [-g group] [file]\n");
175 char *p, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[MAXPATHLEN];
180 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
181 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
182 err(1, "can't open temporary file");
183 (void)unlink(tmpname);
186 tty = ttyname(STDERR_FILENO);
190 if (!(whom = getlogin()))
191 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
192 (void)gethostname(hostname, sizeof(hostname));
194 lt = localtime(&now);
197 * all this stuff is to blank out a square for the message;
198 * we wrap message lines at column 79, not 80, because some
199 * terminals wrap after 79, some do not, and we can't tell.
200 * Which means that we may leave a non-blank character
201 * in column 80, but that can't be helped.
203 (void)fprintf(fp, "\r%79s\r\n", " ");
204 (void)snprintf(lbuf, sizeof(lbuf),
205 "Broadcast Message from %s@%s",
207 (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
208 (void)snprintf(lbuf, sizeof(lbuf),
209 " (%s) at %d:%02d %s...", tty,
210 lt->tm_hour, lt->tm_min, lt->tm_zone);
211 (void)fprintf(fp, "%-79.79s\r\n", lbuf);
213 (void)fprintf(fp, "%79s\r\n", " ");
218 if (freopen(fname, "r", stdin) == NULL)
219 err(1, "can't read %s", fname);
222 while (fgets(lbuf, sizeof(lbuf), stdin))
223 for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
226 } else if (cnt == 79 || ch == '\n') {
227 for (; cnt < 79; ++cnt)
232 } else if (((ch & 0x80) && ch < 0xA0) ||
233 /* disable upper controls */
234 (!isprint(ch) && !isspace(ch) &&
235 ch != '\a' && ch != '\b')
266 (void)fprintf(fp, "%79s\r\n", " ");
269 if (fstat(fd, &sbuf))
270 err(1, "can't stat temporary file");
271 mbufsize = sbuf.st_size;
272 if (!(mbuf = malloc((u_int)mbufsize)))
273 err(1, "out of memory");
274 if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
275 err(1, "can't read temporary file");