mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
295 lines
7.4 KiB
C
295 lines
7.4 KiB
C
/*
|
|
* Copyright (c) 1988, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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>
|
|
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1988, 1990, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif
|
|
|
|
#ifndef lint
|
|
static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
|
|
#endif
|
|
|
|
/*
|
|
* 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/uio.h>
|
|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <grp.h>
|
|
#include <locale.h>
|
|
#include <paths.h>
|
|
#include <pwd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
#include <utmp.h>
|
|
|
|
#include "ttymsg.h"
|
|
|
|
static void makemsg(char *);
|
|
static void usage(void);
|
|
|
|
struct wallgroup {
|
|
struct wallgroup *next;
|
|
char *name;
|
|
gid_t gid;
|
|
} *grouplist;
|
|
int nobanner;
|
|
int mbufsize;
|
|
char *mbuf;
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct iovec iov;
|
|
struct utmp utmp;
|
|
int ch;
|
|
int ingroup;
|
|
FILE *fp;
|
|
struct wallgroup *g;
|
|
struct group *grp;
|
|
char **np;
|
|
const char *p;
|
|
struct passwd *pw;
|
|
char line[sizeof(utmp.ut_line) + 1];
|
|
char username[sizeof(utmp.ut_name) + 1];
|
|
|
|
(void)setlocale(LC_CTYPE, "");
|
|
|
|
while ((ch = getopt(argc, argv, "g:n")) != -1)
|
|
switch (ch) {
|
|
case 'n':
|
|
/* undoc option for shutdown: suppress banner */
|
|
if (geteuid() == 0)
|
|
nobanner = 1;
|
|
break;
|
|
case 'g':
|
|
g = (struct wallgroup *)malloc(sizeof *g);
|
|
g->next = grouplist;
|
|
g->name = optarg;
|
|
g->gid = -1;
|
|
grouplist = g;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc > 1)
|
|
usage();
|
|
|
|
for (g = grouplist; g; g = g->next) {
|
|
grp = getgrnam(g->name);
|
|
if (grp != NULL)
|
|
g->gid = grp->gr_gid;
|
|
else
|
|
warnx("%s: no such group", g->name);
|
|
}
|
|
|
|
makemsg(*argv);
|
|
|
|
if (!(fp = fopen(_PATH_UTMP, "r")))
|
|
err(1, "cannot read %s", _PATH_UTMP);
|
|
iov.iov_base = mbuf;
|
|
iov.iov_len = mbufsize;
|
|
/* NOSTRICT */
|
|
while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
|
|
if (!utmp.ut_name[0])
|
|
continue;
|
|
if (grouplist) {
|
|
ingroup = 0;
|
|
strlcpy(username, utmp.ut_name, sizeof(utmp.ut_name));
|
|
pw = getpwnam(username);
|
|
if (!pw)
|
|
continue;
|
|
for (g = grouplist; g && ingroup == 0; g = g->next) {
|
|
if (g->gid == (gid_t)-1)
|
|
continue;
|
|
if (g->gid == pw->pw_gid)
|
|
ingroup = 1;
|
|
else if ((grp = getgrgid(g->gid)) != NULL) {
|
|
for (np = grp->gr_mem; *np; np++) {
|
|
if (strcmp(*np, username) == 0) {
|
|
ingroup = 1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (ingroup == 0)
|
|
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)
|
|
warnx("%s", p);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
static void
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr, "usage: wall [-g group] [file]\n");
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
makemsg(char *fname)
|
|
{
|
|
int cnt;
|
|
unsigned char ch;
|
|
struct tm *lt;
|
|
struct passwd *pw;
|
|
struct stat sbuf;
|
|
time_t now;
|
|
FILE *fp;
|
|
int fd;
|
|
char *p, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
|
|
const char *tty;
|
|
const char *whom;
|
|
gid_t egid;
|
|
|
|
(void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
|
|
if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
|
|
err(1, "can't open temporary file");
|
|
(void)unlink(tmpname);
|
|
|
|
if (!nobanner) {
|
|
tty = ttyname(STDERR_FILENO);
|
|
if (tty == NULL)
|
|
tty = "no tty";
|
|
|
|
if (!(whom = getlogin()))
|
|
whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
|
|
(void)gethostname(hostname, sizeof(hostname));
|
|
(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);
|
|
(void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
|
|
(void)snprintf(lbuf, sizeof(lbuf),
|
|
" (%s) at %d:%02d %s...", tty,
|
|
lt->tm_hour, lt->tm_min, lt->tm_zone);
|
|
(void)fprintf(fp, "%-79.79s\r\n", lbuf);
|
|
}
|
|
(void)fprintf(fp, "%79s\r\n", " ");
|
|
|
|
if (fname) {
|
|
egid = getegid();
|
|
setegid(getgid());
|
|
if (freopen(fname, "r", stdin) == NULL)
|
|
err(1, "can't read %s", fname);
|
|
setegid(egid);
|
|
}
|
|
while (fgets(lbuf, sizeof(lbuf), stdin))
|
|
for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
|
|
if (ch == '\r') {
|
|
cnt = 0;
|
|
} else if (cnt == 79 || ch == '\n') {
|
|
for (; cnt < 79; ++cnt)
|
|
putc(' ', fp);
|
|
putc('\r', fp);
|
|
putc('\n', fp);
|
|
cnt = 0;
|
|
} else if (((ch & 0x80) && ch < 0xA0) ||
|
|
/* disable upper controls */
|
|
(!isprint(ch) && !isspace(ch) &&
|
|
ch != '\a' && ch != '\b')
|
|
) {
|
|
if (ch & 0x80) {
|
|
ch &= 0x7F;
|
|
putc('M', fp);
|
|
if (++cnt == 79) {
|
|
putc('\r', fp);
|
|
putc('\n', fp);
|
|
cnt = 0;
|
|
}
|
|
putc('-', fp);
|
|
if (++cnt == 79) {
|
|
putc('\r', fp);
|
|
putc('\n', fp);
|
|
cnt = 0;
|
|
}
|
|
}
|
|
if (iscntrl(ch)) {
|
|
ch ^= 040;
|
|
putc('^', fp);
|
|
if (++cnt == 79) {
|
|
putc('\r', fp);
|
|
putc('\n', fp);
|
|
cnt = 0;
|
|
}
|
|
}
|
|
putc(ch, fp);
|
|
} else {
|
|
putc(ch, fp);
|
|
}
|
|
}
|
|
(void)fprintf(fp, "%79s\r\n", " ");
|
|
rewind(fp);
|
|
|
|
if (fstat(fd, &sbuf))
|
|
err(1, "can't stat temporary file");
|
|
mbufsize = sbuf.st_size;
|
|
if (!(mbuf = malloc((u_int)mbufsize)))
|
|
err(1, "out of memory");
|
|
if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
|
|
err(1, "can't read temporary file");
|
|
(void)close(fd);
|
|
}
|