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* Copyright (c) 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* Modified Sun Mar 12 10:34:34 1995, faith@cs.unc.edu, for Linux
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* This program is not related to David Wall, whose Stanford Ph.D. thesis
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* is entitled "Mechanisms for Broadcast and Selective Broadcast".
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* 1999-02-22 Arkadiusz Mi�kiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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#include <sys/param.h>
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#include "pathnames.h"
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#include "carefulputc.h"
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void makemsg __P((char *));
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#define IGNOREUSER "sleeper"
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#ifndef MAXHOSTNAMELEN
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# define MAXHOSTNAMELEN HOST_NAME_MAX
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# define MAXHOSTNAMELEN 64
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static void __attribute__((__noreturn__)) usage(void)
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errx(EXIT_FAILURE, _("usage: %s [-n] [file]\n"),
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program_invocation_short_name);
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main(int argc, char **argv) {
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char line[sizeof(utmpptr->ut_line) + 1];
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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while ((ch = getopt(argc, argv, "n")) != -1) {
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iov.iov_len = mbufsize;
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while((utmpptr = getutent())) {
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if (!utmpptr->ut_name[0] ||
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!strncmp(utmpptr->ut_name, IGNOREUSER,
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sizeof(utmpptr->ut_name)))
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if (utmpptr->ut_type != USER_PROCESS)
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/* Joey Hess reports that use-sessreg in /etc/X11/wdm/
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produces ut_line entries like :0, and a write
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if (utmpptr->ut_line[0] == ':')
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xstrncpy(line, utmpptr->ut_line, sizeof(utmpptr->ut_line));
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if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
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register int ch, cnt;
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char *p, *whom, *where, hostname[MAXHOSTNAMELEN],
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lbuf[MAXHOSTNAMELEN + 320],
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tmpname[sizeof(_PATH_TMP) + 20];
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sprintf(tmpname, "%s/wall.XXXXXX", _PATH_TMP);
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if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+")))
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errx(EXIT_FAILURE, _("can't open temporary file"));
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if (!(whom = getlogin()) || !*whom)
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whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
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if (!whom || strlen(whom) > 100)
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if (!where || strlen(where) > 100)
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gethostname(hostname, sizeof(hostname));
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lt = localtime(&now);
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* all this stuff is to blank out a square for the message;
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* we wrap message lines at column 79, not 80, because some
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* terminals wrap after 79, some do not, and we can't tell.
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* Which means that we may leave a non-blank character
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* in column 80, but that can't be helped.
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/* snprintf is not always available, but the sprintf's here
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will not overflow as long as %d takes at most 100 chars */
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fprintf(fp, "\r%79s\r\n", " ");
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sprintf(lbuf, _("Broadcast Message from %s@%s"),
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fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
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sprintf(lbuf, " (%s) at %d:%02d ...",
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where, lt->tm_hour, lt->tm_min);
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fprintf(fp, "%-79.79s\r\n", lbuf);
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fprintf(fp, "%79s\r\n", " ");
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* When we are not root, but suid or sgid, refuse to read files
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* (e.g. device files) that the user may not have access to.
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* After all, our invoker can easily do "wall < file"
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* instead of "wall file".
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if (uid && (uid != geteuid() || getgid() != getegid()))
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errx(EXIT_FAILURE, _("will not read %s - use stdin."),
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if (!freopen(fname, "r", stdin))
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errx(EXIT_FAILURE, _("can't read %s."), fname);
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while (fgets(lbuf, sizeof(lbuf), stdin)) {
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for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
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if (cnt == 79 || ch == '\n') {
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for (; cnt < 79; ++cnt)
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fprintf(fp, "%79s\r\n", " ");
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if (fstat(fd, &sbuf))
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err(EXIT_FAILURE, _("fstat failed"));
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mbufsize = sbuf.st_size;
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mbuf = xmalloc(mbufsize);
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if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
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err(EXIT_FAILURE, _("fread failed"));