NetBSD/usr.bin/wall/wall.c

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/* $NetBSD: wall.c,v 1.11 1998/07/26 23:15:38 mycroft Exp $ */
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/*
* Copyright (c) 1988, 1990, 1993
* 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
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
#endif
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__RCSID("$NetBSD: wall.c,v 1.11 1998/07/26 23:15:38 mycroft Exp $");
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#endif /* not lint */
/*
* This program is not related to David Wall, whose Stanford Ph.D. thesis
* is entitled "Mechanisms for Broadcast and Selective Broadcast".
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
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#include <err.h>
#include <paths.h>
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#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>
#include <util.h>
void makemsg __P((char *));
int main __P((int, char *[]));
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#define IGNOREUSER "sleeper"
int nobanner;
int mbufsize;
char *mbuf;
/* ARGSUSED */
int
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main(argc, argv)
int argc;
char **argv;
{
extern int optind;
int ch;
struct iovec iov;
struct utmp utmp;
FILE *fp;
char *p;
struct passwd *pep = getpwnam("nobody");
char line[sizeof(utmp.ut_line) + 1];
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while ((ch = getopt(argc, argv, "n")) != -1)
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switch (ch) {
case 'n':
/* undoc option for shutdown: suppress banner */
if (geteuid() == 0 || (pep && getuid() == pep->pw_uid))
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nobanner = 1;
break;
case '?':
default:
usage:
(void)fprintf(stderr, "usage: wall [file]\n");
exit(1);
}
argc -= optind;
argv += optind;
if (argc > 1)
goto usage;
makemsg(*argv);
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if (!(fp = fopen(_PATH_UTMP, "r")))
err(1, "cannot read %s", _PATH_UTMP);
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iov.iov_base = mbuf;
iov.iov_len = mbufsize;
/* NOSTRICT */
while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
if (!utmp.ut_name[0] ||
!strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
continue;
strncpy(line, utmp.ut_line, sizeof(utmp.ut_line));
line[sizeof(utmp.ut_line)] = '\0';
if ((p = ttymsg(&iov, 1, line, 60*5)) != NULL)
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warnx("%s", p);
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}
exit(0);
}
void
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makemsg(fname)
char *fname;
{
register int ch, cnt;
struct tm *lt;
struct passwd *pw;
struct stat sbuf;
time_t now;
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FILE *fp;
int fd;
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const char *whom;
char *p, hostname[MAXHOSTNAMELEN+1], lbuf[100], tmpname[15];
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(void)snprintf(tmpname, sizeof tmpname, "%s/wall.XXXXXX", _PATH_TMP);
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if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+")))
err(1, "can't open temporary file");
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(void)unlink(tmpname);
if (!nobanner) {
if (!(whom = getlogin()))
whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
(void)gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
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(void)time(&now);
lt = localtime(&now);
/*
* all this stuff is to blank out a square for the message;
* we wrap message lines at column 79, not 80, because some
* terminals wrap after 79, some do not, and we can't tell.
* Which means that we may leave a non-blank character
* in column 80, but that can't be helped.
*/
(void)fprintf(fp, "\r%79s\r\n", " ");
(void)snprintf(lbuf, sizeof lbuf,
"Broadcast Message from %s@%s", whom, hostname);
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(void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
(void)snprintf(lbuf, sizeof lbuf, " (%s) at %d:%02d ...",
ttyname(2), lt->tm_hour, lt->tm_min);
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(void)fprintf(fp, "%-79.79s\r\n", lbuf);
}
(void)fprintf(fp, "%79s\r\n", " ");
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if (fname && !(freopen(fname, "r", stdin)))
err(1, "can't read %s", fname);
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while (fgets(lbuf, sizeof(lbuf), stdin))
for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
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if (cnt == 79 || ch == '\n') {
for (; cnt < 79; ++cnt)
putc(' ', fp);
putc('\r', fp);
putc('\n', fp);
cnt = -1;
}
if (ch != '\n')
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putc(ch, fp);
}
(void)fprintf(fp, "%79s\r\n", " ");
rewind(fp);
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if (fstat(fd, &sbuf))
err(1, "can't stat temporary file");
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mbufsize = sbuf.st_size;
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if (!(mbuf = malloc((u_int)mbufsize)))
err(1, "malloc");
if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
err(1, "can't read temporary file");
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(void)close(fd);
}