wall.c revision 1.18 1 1.18 mjl /* $NetBSD: wall.c,v 1.18 2001/01/05 04:06:49 mjl Exp $ */
2 1.6 jtc
3 1.1 cgd /*
4 1.6 jtc * Copyright (c) 1988, 1990, 1993
5 1.6 jtc * The Regents of the University of California. All rights reserved.
6 1.1 cgd *
7 1.1 cgd * Redistribution and use in source and binary forms, with or without
8 1.1 cgd * modification, are permitted provided that the following conditions
9 1.1 cgd * are met:
10 1.1 cgd * 1. Redistributions of source code must retain the above copyright
11 1.1 cgd * notice, this list of conditions and the following disclaimer.
12 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright
13 1.1 cgd * notice, this list of conditions and the following disclaimer in the
14 1.1 cgd * documentation and/or other materials provided with the distribution.
15 1.1 cgd * 3. All advertising materials mentioning features or use of this software
16 1.1 cgd * must display the following acknowledgement:
17 1.1 cgd * This product includes software developed by the University of
18 1.1 cgd * California, Berkeley and its contributors.
19 1.1 cgd * 4. Neither the name of the University nor the names of its contributors
20 1.1 cgd * may be used to endorse or promote products derived from this software
21 1.1 cgd * without specific prior written permission.
22 1.1 cgd *
23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 1.1 cgd * SUCH DAMAGE.
34 1.1 cgd */
35 1.1 cgd
36 1.8 christos #include <sys/cdefs.h>
37 1.1 cgd #ifndef lint
38 1.8 christos __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
39 1.8 christos The Regents of the University of California. All rights reserved.\n");
40 1.1 cgd #endif /* not lint */
41 1.1 cgd
42 1.1 cgd #ifndef lint
43 1.6 jtc #if 0
44 1.6 jtc static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
45 1.6 jtc #endif
46 1.18 mjl __RCSID("$NetBSD: wall.c,v 1.18 2001/01/05 04:06:49 mjl Exp $");
47 1.1 cgd #endif /* not lint */
48 1.1 cgd
49 1.1 cgd /*
50 1.1 cgd * This program is not related to David Wall, whose Stanford Ph.D. thesis
51 1.1 cgd * is entitled "Mechanisms for Broadcast and Selective Broadcast".
52 1.1 cgd */
53 1.1 cgd
54 1.1 cgd #include <sys/param.h>
55 1.1 cgd #include <sys/stat.h>
56 1.1 cgd #include <sys/time.h>
57 1.1 cgd #include <sys/uio.h>
58 1.6 jtc
59 1.9 lukem #include <err.h>
60 1.6 jtc #include <paths.h>
61 1.1 cgd #include <pwd.h>
62 1.1 cgd #include <stdio.h>
63 1.1 cgd #include <stdlib.h>
64 1.5 jtc #include <string.h>
65 1.5 jtc #include <unistd.h>
66 1.6 jtc #include <utmp.h>
67 1.8 christos #include <util.h>
68 1.6 jtc
69 1.18 mjl void makemsg(const char *);
70 1.18 mjl int main(int, char **);
71 1.1 cgd
72 1.1 cgd int nobanner;
73 1.1 cgd int mbufsize;
74 1.1 cgd char *mbuf;
75 1.1 cgd
76 1.1 cgd /* ARGSUSED */
77 1.5 jtc int
78 1.18 mjl main(int argc, char **argv)
79 1.1 cgd {
80 1.1 cgd int ch;
81 1.1 cgd struct iovec iov;
82 1.1 cgd struct utmp utmp;
83 1.1 cgd FILE *fp;
84 1.8 christos char *p;
85 1.2 cgd struct passwd *pep = getpwnam("nobody");
86 1.6 jtc char line[sizeof(utmp.ut_line) + 1];
87 1.1 cgd
88 1.9 lukem while ((ch = getopt(argc, argv, "n")) != -1)
89 1.1 cgd switch (ch) {
90 1.1 cgd case 'n':
91 1.1 cgd /* undoc option for shutdown: suppress banner */
92 1.2 cgd if (geteuid() == 0 || (pep && getuid() == pep->pw_uid))
93 1.1 cgd nobanner = 1;
94 1.1 cgd break;
95 1.1 cgd case '?':
96 1.1 cgd default:
97 1.1 cgd usage:
98 1.1 cgd (void)fprintf(stderr, "usage: wall [file]\n");
99 1.1 cgd exit(1);
100 1.1 cgd }
101 1.1 cgd argc -= optind;
102 1.1 cgd argv += optind;
103 1.1 cgd if (argc > 1)
104 1.1 cgd goto usage;
105 1.1 cgd
106 1.1 cgd makemsg(*argv);
107 1.1 cgd
108 1.9 lukem if (!(fp = fopen(_PATH_UTMP, "r")))
109 1.9 lukem err(1, "cannot read %s", _PATH_UTMP);
110 1.1 cgd iov.iov_base = mbuf;
111 1.1 cgd iov.iov_len = mbufsize;
112 1.1 cgd /* NOSTRICT */
113 1.1 cgd while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
114 1.17 mjl if (!utmp.ut_name[0])
115 1.1 cgd continue;
116 1.6 jtc strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
117 1.6 jtc line[sizeof(utmp.ut_line)] = '\0';
118 1.6 jtc if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
119 1.9 lukem warnx("%s", p);
120 1.1 cgd }
121 1.1 cgd exit(0);
122 1.1 cgd }
123 1.1 cgd
124 1.5 jtc void
125 1.18 mjl makemsg(const char *fname)
126 1.1 cgd {
127 1.1 cgd register int ch, cnt;
128 1.1 cgd struct tm *lt;
129 1.1 cgd struct passwd *pw;
130 1.1 cgd struct stat sbuf;
131 1.8 christos time_t now;
132 1.1 cgd FILE *fp;
133 1.1 cgd int fd;
134 1.11 mycroft const char *whom;
135 1.16 taca char *p, *tty, tmpname[32], lbuf[100], hostname[MAXHOSTNAMELEN+1];
136 1.1 cgd
137 1.7 mrg (void)snprintf(tmpname, sizeof tmpname, "%s/wall.XXXXXX", _PATH_TMP);
138 1.12 christos if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
139 1.9 lukem err(1, "can't open temporary file");
140 1.1 cgd (void)unlink(tmpname);
141 1.1 cgd
142 1.1 cgd if (!nobanner) {
143 1.1 cgd if (!(whom = getlogin()))
144 1.1 cgd whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
145 1.1 cgd (void)gethostname(hostname, sizeof(hostname));
146 1.10 mrg hostname[sizeof(hostname) - 1] = '\0';
147 1.1 cgd (void)time(&now);
148 1.1 cgd lt = localtime(&now);
149 1.1 cgd
150 1.1 cgd /*
151 1.1 cgd * all this stuff is to blank out a square for the message;
152 1.1 cgd * we wrap message lines at column 79, not 80, because some
153 1.1 cgd * terminals wrap after 79, some do not, and we can't tell.
154 1.1 cgd * Which means that we may leave a non-blank character
155 1.1 cgd * in column 80, but that can't be helped.
156 1.1 cgd */
157 1.1 cgd (void)fprintf(fp, "\r%79s\r\n", " ");
158 1.7 mrg (void)snprintf(lbuf, sizeof lbuf,
159 1.7 mrg "Broadcast Message from %s@%s", whom, hostname);
160 1.1 cgd (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
161 1.14 taca tty = ttyname(STDERR_FILENO);
162 1.14 taca if (tty == NULL)
163 1.16 taca tty = "??";
164 1.16 taca (void)snprintf(lbuf, sizeof lbuf,
165 1.16 taca " (%s) at %d:%02d ...", tty, lt->tm_hour,
166 1.16 taca lt->tm_min);
167 1.1 cgd (void)fprintf(fp, "%-79.79s\r\n", lbuf);
168 1.1 cgd }
169 1.1 cgd (void)fprintf(fp, "%79s\r\n", " ");
170 1.1 cgd
171 1.9 lukem if (fname && !(freopen(fname, "r", stdin)))
172 1.9 lukem err(1, "can't read %s", fname);
173 1.1 cgd while (fgets(lbuf, sizeof(lbuf), stdin))
174 1.6 jtc for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
175 1.1 cgd if (cnt == 79 || ch == '\n') {
176 1.1 cgd for (; cnt < 79; ++cnt)
177 1.1 cgd putc(' ', fp);
178 1.1 cgd putc('\r', fp);
179 1.1 cgd putc('\n', fp);
180 1.3 mycroft cnt = -1;
181 1.3 mycroft }
182 1.3 mycroft if (ch != '\n')
183 1.1 cgd putc(ch, fp);
184 1.1 cgd }
185 1.1 cgd (void)fprintf(fp, "%79s\r\n", " ");
186 1.1 cgd rewind(fp);
187 1.1 cgd
188 1.9 lukem if (fstat(fd, &sbuf))
189 1.9 lukem err(1, "can't stat temporary file");
190 1.1 cgd mbufsize = sbuf.st_size;
191 1.9 lukem if (!(mbuf = malloc((u_int)mbufsize)))
192 1.9 lukem err(1, "malloc");
193 1.9 lukem if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
194 1.9 lukem err(1, "can't read temporary file");
195 1.1 cgd (void)close(fd);
196 1.1 cgd }
197