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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static const char copyright[] =
36 "@(#) Copyright (c) 1988, 1990, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
42 static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
44 static const char rcsid[] =
49 * This program is not related to David Wall, whose Stanford Ph.D. thesis
50 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
53 #include <sys/param.h>
72 static void makemsg(char *);
73 static void usage(void);
75 #define IGNOREUSER "sleeper"
78 struct wallgroup *next;
87 main(int argc, char *argv[])
99 char line[sizeof(utmp.ut_line) + 1];
100 char username[sizeof(utmp.ut_name) + 1];
102 (void)setlocale(LC_CTYPE, "");
104 while ((ch = getopt(argc, argv, "g:n")) != -1)
107 /* undoc option for shutdown: suppress banner */
112 g = (struct wallgroup *)malloc(sizeof *g);
127 for (g = grouplist; g; g = g->next) {
128 grp = getgrnam(g->name);
130 g->gid = grp->gr_gid;
132 warnx("%s: no such group", g->name);
137 if (!(fp = fopen(_PATH_UTMP, "r")))
138 err(1, "cannot read %s", _PATH_UTMP);
140 iov.iov_len = mbufsize;
142 while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
143 if (!utmp.ut_name[0] ||
144 !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
148 strlcpy(username, utmp.ut_name, sizeof(utmp.ut_name));
149 pw = getpwnam(username);
152 for (g = grouplist; g && ingroup == 0; g = g->next) {
155 if (g->gid == pw->pw_gid)
157 else if ((grp = getgrgid(g->gid)) != NULL) {
158 for (np = grp->gr_mem; *np; np++) {
159 if (strcmp(*np, username) == 0) {
169 strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
170 line[sizeof(utmp.ut_line)] = '\0';
171 if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
180 (void)fprintf(stderr, "usage: wall [-g group] [file]\n");
195 char *p, *tty, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
199 (void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
200 if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
201 err(1, "can't open temporary file");
202 (void)unlink(tmpname);
205 tty = ttyname(STDERR_FILENO);
209 if (!(whom = getlogin()))
210 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
211 (void)gethostname(hostname, sizeof(hostname));
213 lt = localtime(&now);
216 * all this stuff is to blank out a square for the message;
217 * we wrap message lines at column 79, not 80, because some
218 * terminals wrap after 79, some do not, and we can't tell.
219 * Which means that we may leave a non-blank character
220 * in column 80, but that can't be helped.
222 (void)fprintf(fp, "\r%79s\r\n", " ");
223 (void)snprintf(lbuf, sizeof(lbuf),
224 "Broadcast Message from %s@%s",
226 (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
227 (void)snprintf(lbuf, sizeof(lbuf),
228 " (%s) at %d:%02d %s...", tty,
229 lt->tm_hour, lt->tm_min, lt->tm_zone);
230 (void)fprintf(fp, "%-79.79s\r\n", lbuf);
232 (void)fprintf(fp, "%79s\r\n", " ");
237 if (freopen(fname, "r", stdin) == NULL)
238 err(1, "can't read %s", fname);
241 while (fgets(lbuf, sizeof(lbuf), stdin))
242 for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
245 } else if (cnt == 79 || ch == '\n') {
246 for (; cnt < 79; ++cnt)
251 } else if (((ch & 0x80) && ch < 0xA0) ||
252 /* disable upper controls */
253 (!isprint(ch) && !isspace(ch) &&
254 ch != '\a' && ch != '\b')
285 (void)fprintf(fp, "%79s\r\n", " ");
288 if (fstat(fd, &sbuf))
289 err(1, "can't stat temporary file");
290 mbufsize = sbuf.st_size;
291 if (!(mbuf = malloc((u_int)mbufsize)))
292 err(1, "out of memory");
293 if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
294 err(1, "can't read temporary file");