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Commit | Line | Data |
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6dbe3af9 | 1 | /* |
726f69e2 KZ |
2 | * Copyright (c) 1988, 1990, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
6dbe3af9 KZ |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. | |
20 | * | |
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 | |
31 | * SUCH DAMAGE. | |
32 | * | |
726f69e2 | 33 | * Modified Sun Mar 12 10:34:34 1995, faith@cs.unc.edu, for Linux |
6dbe3af9 KZ |
34 | */ |
35 | ||
6dbe3af9 KZ |
36 | /* |
37 | * This program is not related to David Wall, whose Stanford Ph.D. thesis | |
38 | * is entitled "Mechanisms for Broadcast and Selective Broadcast". | |
7eda085c | 39 | * |
b50945d4 | 40 | * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
7eda085c KZ |
41 | * - added Native Language Support |
42 | * | |
6dbe3af9 KZ |
43 | */ |
44 | ||
45 | #include <sys/param.h> | |
46 | #include <sys/stat.h> | |
47 | #include <sys/time.h> | |
48 | #include <sys/uio.h> | |
726f69e2 | 49 | |
aa00c136 | 50 | #include <errno.h> |
726f69e2 | 51 | #include <paths.h> |
7eda085c | 52 | #include <ctype.h> |
6dbe3af9 KZ |
53 | #include <pwd.h> |
54 | #include <stdio.h> | |
55 | #include <stdlib.h> | |
726f69e2 | 56 | #include <string.h> |
c07ebfa1 | 57 | #include <time.h> |
726f69e2 KZ |
58 | #include <unistd.h> |
59 | #include <utmp.h> | |
76cc41b7 | 60 | #include <getopt.h> |
66ee8158 | 61 | |
7eda085c | 62 | #include "nls.h" |
4b5156cb | 63 | #include "xalloc.h" |
8abcf290 | 64 | #include "strutils.h" |
66ee8158 | 65 | #include "ttymsg.h" |
726f69e2 | 66 | #include "pathnames.h" |
66ee8158 | 67 | #include "carefulputc.h" |
eb76ca98 | 68 | #include "c.h" |
a000bbb6 | 69 | #include "fileutils.h" |
cdd2a8c3 | 70 | #include "closestream.h" |
726f69e2 | 71 | |
42e296b5 SK |
72 | #define TERM_WIDTH 79 |
73 | #define WRITE_TIME_OUT 300 /* in seconds */ | |
6dbe3af9 | 74 | |
98e2d4de | 75 | /* Function prototypes */ |
cdd3cc7f KZ |
76 | static char *makemsg(char *fname, char **mvec, int mvecsz, |
77 | size_t *mbufsize, int print_banner); | |
6dbe3af9 | 78 | |
76cc41b7 | 79 | static void __attribute__((__noreturn__)) usage(FILE *out) |
dfdf2081 | 80 | { |
bbeae1ce | 81 | fputs(USAGE_HEADER, out); |
a290362b | 82 | fprintf(out, |
bbeae1ce SK |
83 | _(" %s [options] [<file> | <message>]\n"), program_invocation_short_name); |
84 | fputs(USAGE_OPTIONS, out); | |
85 | fputs(_(" -n, --nobanner do not print banner, works only for root\n"), out); | |
86 | fputs(_(" -t, --timeout <timeout> write timeout in seconds\n"), out); | |
87 | fputs(USAGE_SEPARATOR, out); | |
88 | fputs(USAGE_HELP, out); | |
89 | fputs(USAGE_VERSION, out); | |
90 | fprintf(out, USAGE_MAN_TAIL("wall(1)")); | |
76cc41b7 SK |
91 | |
92 | exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); | |
dfdf2081 DB |
93 | } |
94 | ||
d81c3055 KZ |
95 | int main(int argc, char **argv) |
96 | { | |
6dbe3af9 KZ |
97 | int ch; |
98 | struct iovec iov; | |
7eda085c | 99 | struct utmp *utmpptr; |
66ee8158 | 100 | char *p; |
7eda085c | 101 | char line[sizeof(utmpptr->ut_line) + 1]; |
98e2d4de | 102 | int print_banner = TRUE; |
cdd3cc7f | 103 | char *mbuf, *fname = NULL; |
98e2d4de | 104 | size_t mbufsize; |
b43d3a3a | 105 | unsigned timeout = WRITE_TIME_OUT; |
cdd3cc7f KZ |
106 | char **mvec = NULL; |
107 | int mvecsz = 0; | |
7eda085c | 108 | |
76cc41b7 SK |
109 | static const struct option longopts[] = { |
110 | { "nobanner", no_argument, 0, 'n' }, | |
cae7485e | 111 | { "timeout", required_argument, 0, 't' }, |
76cc41b7 SK |
112 | { "version", no_argument, 0, 'V' }, |
113 | { "help", no_argument, 0, 'h' }, | |
114 | { NULL, 0, 0, 0 } | |
115 | }; | |
116 | ||
3acc206d SK |
117 | setlocale(LC_ALL, ""); |
118 | bindtextdomain(PACKAGE, LOCALEDIR); | |
119 | textdomain(PACKAGE); | |
120 | atexit(close_stdout); | |
121 | ||
cae7485e | 122 | while ((ch = getopt_long(argc, argv, "nt:Vh", longopts, NULL)) != -1) { |
6dbe3af9 KZ |
123 | switch (ch) { |
124 | case 'n': | |
6dbe3af9 | 125 | if (geteuid() == 0) |
98e2d4de | 126 | print_banner = FALSE; |
76cc41b7 SK |
127 | else |
128 | warnx(_("--nobanner is available only for root")); | |
6dbe3af9 | 129 | break; |
cae7485e | 130 | case 't': |
b43d3a3a | 131 | timeout = strtou32_or_err(optarg, _("invalid timeout argument")); |
cae7485e SK |
132 | if (timeout < 1) |
133 | errx(EXIT_FAILURE, _("invalid timeout argument: %s"), optarg); | |
134 | break; | |
76cc41b7 | 135 | case 'V': |
bbeae1ce | 136 | printf(UTIL_LINUX_VERSION); |
76cc41b7 SK |
137 | exit(EXIT_SUCCESS); |
138 | case 'h': | |
139 | usage(stdout); | |
6dbe3af9 | 140 | default: |
76cc41b7 | 141 | usage(stderr); |
6dbe3af9 | 142 | } |
00f41c7d | 143 | } |
6dbe3af9 KZ |
144 | argc -= optind; |
145 | argv += optind; | |
6dbe3af9 | 146 | |
cdd3cc7f KZ |
147 | if (argc == 1 && access(argv[0], F_OK) == 0) |
148 | fname = argv[0]; | |
149 | else if (argc >= 1) { | |
150 | mvec = argv; | |
151 | mvecsz = argc; | |
152 | } | |
153 | ||
154 | mbuf = makemsg(fname, mvec, mvecsz, &mbufsize, print_banner); | |
7eda085c | 155 | |
6dbe3af9 KZ |
156 | iov.iov_base = mbuf; |
157 | iov.iov_len = mbufsize; | |
7eda085c | 158 | while((utmpptr = getutent())) { |
cfa7fe89 | 159 | if (!utmpptr->ut_user[0]) |
7eda085c KZ |
160 | continue; |
161 | #ifdef USER_PROCESS | |
162 | if (utmpptr->ut_type != USER_PROCESS) | |
6dbe3af9 | 163 | continue; |
6dbe3af9 | 164 | #endif |
e8f26419 KZ |
165 | /* Joey Hess reports that use-sessreg in /etc/X11/wdm/ |
166 | produces ut_line entries like :0, and a write | |
167 | to /dev/:0 fails. */ | |
168 | if (utmpptr->ut_line[0] == ':') | |
169 | continue; | |
170 | ||
c07ebfa1 | 171 | xstrncpy(line, utmpptr->ut_line, sizeof(utmpptr->ut_line)); |
cae7485e | 172 | if ((p = ttymsg(&iov, 1, line, timeout)) != NULL) |
aa00c136 | 173 | warnx("%s", p); |
6dbe3af9 | 174 | } |
7eda085c | 175 | endutent(); |
98e2d4de | 176 | free(mbuf); |
d0acbd38 | 177 | exit(EXIT_SUCCESS); |
6dbe3af9 KZ |
178 | } |
179 | ||
d81c3055 KZ |
180 | static char *makemsg(char *fname, char **mvec, int mvecsz, |
181 | size_t *mbufsize, int print_banner) | |
6dbe3af9 KZ |
182 | { |
183 | register int ch, cnt; | |
6dbe3af9 | 184 | struct stat sbuf; |
6dbe3af9 | 185 | FILE *fp; |
d81c3055 | 186 | char *p, *lbuf, *tmpname, *mbuf; |
98e2d4de | 187 | long line_max; |
6dbe3af9 | 188 | |
98e2d4de | 189 | line_max = sysconf(_SC_LINE_MAX); |
479912e7 KZ |
190 | if (line_max <= 0) |
191 | line_max = 512; | |
192 | ||
98e2d4de | 193 | lbuf = xmalloc(line_max); |
d0acbd38 | 194 | |
3c4fed09 | 195 | if ((fp = xfmkstemp(&tmpname, NULL)) == NULL) |
a000bbb6 | 196 | err(EXIT_FAILURE, _("can't open temporary file")); |
00f41c7d | 197 | unlink(tmpname); |
98e2d4de | 198 | free(tmpname); |
6dbe3af9 | 199 | |
98e2d4de | 200 | if (print_banner == TRUE) { |
2281e1ed | 201 | char *hostname = xgethostname(); |
d81c3055 KZ |
202 | char *whom, *where, *date; |
203 | struct passwd *pw; | |
204 | time_t now; | |
205 | ||
7eda085c | 206 | if (!(whom = getlogin()) || !*whom) |
6dbe3af9 | 207 | whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; |
98e2d4de | 208 | if (!whom) { |
2b6fc908 | 209 | whom = "someone"; |
98e2d4de SK |
210 | warn(_("cannot get passwd uid")); |
211 | } | |
212 | where = ttyname(STDOUT_FILENO); | |
213 | if (!where) { | |
2b6fc908 | 214 | where = "somewhere"; |
98e2d4de | 215 | warn(_("cannot get tty name")); |
d81c3055 KZ |
216 | } else if (strncmp(where, "/dev/", 5) == 0) |
217 | where += 5; | |
218 | ||
00f41c7d | 219 | time(&now); |
d81c3055 KZ |
220 | date = xstrdup(ctime(&now)); |
221 | date[strlen(date) - 1] = '\0'; | |
6dbe3af9 KZ |
222 | |
223 | /* | |
224 | * all this stuff is to blank out a square for the message; | |
225 | * we wrap message lines at column 79, not 80, because some | |
226 | * terminals wrap after 79, some do not, and we can't tell. | |
227 | * Which means that we may leave a non-blank character | |
228 | * in column 80, but that can't be helped. | |
229 | */ | |
2b6fc908 KZ |
230 | /* snprintf is not always available, but the sprintf's here |
231 | will not overflow as long as %d takes at most 100 chars */ | |
42e296b5 | 232 | fprintf(fp, "\r%*s\r\n", TERM_WIDTH, " "); |
d81c3055 KZ |
233 | sprintf(lbuf, _("Broadcast message from %s@%s (%s) (%s):"), |
234 | whom, hostname, where, date); | |
b928bb10 | 235 | fprintf(fp, "%-*.*s\007\007\r\n", TERM_WIDTH, TERM_WIDTH, lbuf); |
d81c3055 KZ |
236 | free(hostname); |
237 | free(date); | |
6dbe3af9 | 238 | } |
42e296b5 | 239 | fprintf(fp, "%*s\r\n", TERM_WIDTH, " "); |
6dbe3af9 | 240 | |
cdd3cc7f KZ |
241 | if (mvec) { |
242 | /* | |
243 | * Read message from argv[] | |
244 | */ | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < mvecsz; i++) { | |
248 | fputs(mvec[i], fp); | |
249 | if (i < mvecsz - 1) | |
250 | fputc(' ', fp); | |
251 | } | |
252 | fputc('\r', fp); | |
253 | fputc('\n', fp); | |
98e2d4de | 254 | |
cdd3cc7f | 255 | } else { |
66ee8158 | 256 | /* |
cdd3cc7f | 257 | * read message from <file> |
66ee8158 | 258 | */ |
cdd3cc7f KZ |
259 | if (fname) { |
260 | /* | |
261 | * When we are not root, but suid or sgid, refuse to read files | |
262 | * (e.g. device files) that the user may not have access to. | |
263 | * After all, our invoker can easily do "wall < file" | |
264 | * instead of "wall file". | |
265 | */ | |
266 | uid_t uid = getuid(); | |
267 | if (uid && (uid != geteuid() || getgid() != getegid())) | |
268 | errx(EXIT_FAILURE, _("will not read %s - use stdin."), | |
269 | fname); | |
d0acbd38 | 270 | |
cdd3cc7f KZ |
271 | if (!freopen(fname, "r", stdin)) |
272 | err(EXIT_FAILURE, _("cannot open %s"), fname); | |
273 | ||
274 | } | |
66ee8158 | 275 | |
cdd3cc7f KZ |
276 | /* |
277 | * Read message from stdin. | |
278 | */ | |
279 | while (fgets(lbuf, line_max, stdin)) { | |
280 | for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) { | |
42e296b5 SK |
281 | if (cnt == TERM_WIDTH || ch == '\n') { |
282 | for (; cnt < TERM_WIDTH; ++cnt) | |
cdd3cc7f KZ |
283 | putc(' ', fp); |
284 | putc('\r', fp); | |
285 | putc('\n', fp); | |
286 | cnt = 0; | |
287 | } | |
5721ea57 SK |
288 | if (ch == '\t') |
289 | cnt += (7 - (cnt % 8)); | |
cdd3cc7f | 290 | if (ch != '\n') |
78a3b0af | 291 | fputc_careful(ch, fp, '^'); |
726f69e2 | 292 | } |
6dbe3af9 | 293 | } |
66ee8158 | 294 | } |
42e296b5 | 295 | fprintf(fp, "%*s\r\n", TERM_WIDTH, " "); |
98e2d4de SK |
296 | |
297 | free(lbuf); | |
6dbe3af9 KZ |
298 | rewind(fp); |
299 | ||
a000bbb6 | 300 | if (fstat(fileno(fp), &sbuf)) |
add1b8af | 301 | err(EXIT_FAILURE, _("stat failed")); |
d0acbd38 | 302 | |
c666d1d1 KZ |
303 | *mbufsize = (size_t) sbuf.st_size; |
304 | mbuf = xmalloc(*mbufsize); | |
4b5156cb | 305 | |
c666d1d1 | 306 | if (fread(mbuf, 1, *mbufsize, fp) != *mbufsize) |
d0acbd38 MP |
307 | err(EXIT_FAILURE, _("fread failed")); |
308 | ||
cdd2a8c3 SK |
309 | if (close_stream(fp) != 0) |
310 | errx(EXIT_FAILURE, _("write error")); | |
c666d1d1 | 311 | return mbuf; |
6dbe3af9 | 312 | } |