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
33 * Modified Sun Mar 12 10:34:34 1995, faith@cs.unc.edu, for Linux
37 * This program is not related to David Wall, whose Stanford Ph.D. thesis
38 * is entitled "Mechanisms for Broadcast and Selective Broadcast".
40 * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
41 * - added Native Language Support
45 #include <sys/param.h>
66 #include "pathnames.h"
67 #include "carefulputc.h"
69 #include "fileutils.h"
70 #include "closestream.h"
72 #define IGNOREUSER "sleeper"
73 #define WRITE_TIME_OUT 300 /* in seconds */
75 #ifndef MAXHOSTNAMELEN
77 # define MAXHOSTNAMELEN HOST_NAME_MAX
79 # define MAXHOSTNAMELEN 64
83 /* Function prototypes */
84 char *makemsg(char *fname
, size_t *mbufsize
, int print_banner
);
85 static void usage(FILE *out
);
87 static void __attribute__((__noreturn__
)) usage(FILE *out
)
89 fputs(_("\nUsage:\n"), out
);
91 _(" %s [options] [<file>]\n"),program_invocation_short_name
);
93 fputs(_("\nOptions:\n"), out
);
94 fputs(_(" -n, --nobanner do not print banner, works only for root\n"
95 " -t, --timeout <timeout> write timeout in seconds\n"
96 " -V, --version output version information and exit\n"
97 " -h, --help display this help and exit\n\n"), out
);
99 exit(out
== stderr
? EXIT_FAILURE
: EXIT_SUCCESS
);
103 main(int argc
, char **argv
) {
107 struct utmp
*utmpptr
;
109 char line
[sizeof(utmpptr
->ut_line
) + 1];
110 int print_banner
= TRUE
;
113 long timeout
= WRITE_TIME_OUT
;
115 setlocale(LC_ALL
, "");
116 bindtextdomain(PACKAGE
, LOCALEDIR
);
118 atexit(close_stdout
);
120 static const struct option longopts
[] = {
121 { "nobanner", no_argument
, 0, 'n' },
122 { "timeout", required_argument
, 0, 't' },
123 { "version", no_argument
, 0, 'V' },
124 { "help", no_argument
, 0, 'h' },
128 while ((ch
= getopt_long(argc
, argv
, "nt:Vh", longopts
, NULL
)) != -1) {
132 print_banner
= FALSE
;
134 warnx(_("--nobanner is available only for root"));
137 timeout
= strtoll_or_err(optarg
, _("invalid timeout argument"));
139 errx(EXIT_FAILURE
, _("invalid timeout argument: %s"), optarg
);
142 printf(_("%s from %s\n"), program_invocation_short_name
,
156 mbuf
= makemsg(*argv
, &mbufsize
, print_banner
);
159 iov
.iov_len
= mbufsize
;
160 while((utmpptr
= getutent())) {
161 if (!utmpptr
->ut_name
[0] ||
162 !strncmp(utmpptr
->ut_name
, IGNOREUSER
,
163 sizeof(utmpptr
->ut_name
)))
166 if (utmpptr
->ut_type
!= USER_PROCESS
)
170 /* Joey Hess reports that use-sessreg in /etc/X11/wdm/
171 produces ut_line entries like :0, and a write
173 if (utmpptr
->ut_line
[0] == ':')
176 xstrncpy(line
, utmpptr
->ut_line
, sizeof(utmpptr
->ut_line
));
177 if ((p
= ttymsg(&iov
, 1, line
, timeout
)) != NULL
)
186 makemsg(char *fname
, size_t *mbufsize
, int print_banner
)
188 register int ch
, cnt
;
194 char *p
, *whom
, *where
, *hostname
, *lbuf
, *tmpname
, *mbuf
;
197 hostname
= xmalloc(sysconf(_SC_HOST_NAME_MAX
) + 1);
198 line_max
= sysconf(_SC_LINE_MAX
);
199 lbuf
= xmalloc(line_max
);
201 if ((fp
= xfmkstemp(&tmpname
)) == NULL
)
202 err(EXIT_FAILURE
, _("can't open temporary file"));
206 if (print_banner
== TRUE
) {
207 if (!(whom
= getlogin()) || !*whom
)
208 whom
= (pw
= getpwuid(getuid())) ? pw
->pw_name
: "???";
211 warn(_("cannot get passwd uid"));
213 where
= ttyname(STDOUT_FILENO
);
216 warn(_("cannot get tty name"));
218 gethostname(hostname
, sizeof(hostname
));
220 lt
= localtime(&now
);
223 * all this stuff is to blank out a square for the message;
224 * we wrap message lines at column 79, not 80, because some
225 * terminals wrap after 79, some do not, and we can't tell.
226 * Which means that we may leave a non-blank character
227 * in column 80, but that can't be helped.
229 /* snprintf is not always available, but the sprintf's here
230 will not overflow as long as %d takes at most 100 chars */
231 fprintf(fp
, "\r%79s\r\n", " ");
232 sprintf(lbuf
, _("Broadcast Message from %s@%s"),
234 fprintf(fp
, "%-79.79s\007\007\r\n", lbuf
);
235 sprintf(lbuf
, " (%s) at %d:%02d ...",
236 where
, lt
->tm_hour
, lt
->tm_min
);
237 fprintf(fp
, "%-79.79s\r\n", lbuf
);
239 fprintf(fp
, "%79s\r\n", " ");
245 * When we are not root, but suid or sgid, refuse to read files
246 * (e.g. device files) that the user may not have access to.
247 * After all, our invoker can easily do "wall < file"
248 * instead of "wall file".
250 uid_t uid
= getuid();
251 if (uid
&& (uid
!= geteuid() || getgid() != getegid()))
252 errx(EXIT_FAILURE
, _("will not read %s - use stdin."),
255 if (!freopen(fname
, "r", stdin
))
256 err(EXIT_FAILURE
, _("cannot open file %s"), fname
);
259 while (fgets(lbuf
, line_max
, stdin
)) {
260 for (cnt
= 0, p
= lbuf
; (ch
= *p
) != '\0'; ++p
, ++cnt
) {
261 if (cnt
== 79 || ch
== '\n') {
262 for (; cnt
< 79; ++cnt
)
272 fprintf(fp
, "%79s\r\n", " ");
277 if (fstat(fileno(fp
), &sbuf
))
278 err(EXIT_FAILURE
, _("fstat failed"));
280 *mbufsize
= (size_t) sbuf
.st_size
;
281 mbuf
= xmalloc(*mbufsize
);
283 if (fread(mbuf
, 1, *mbufsize
, fp
) != *mbufsize
)
284 err(EXIT_FAILURE
, _("fread failed"));
286 if (close_stream(fp
) != 0)
287 errx(EXIT_FAILURE
, _("write error"));