a06e2ab395
import/switch of: init, getty, reboot, halt, shutdown, wall, last changes: . change reboot() call to netbsd prototype and args . allows pristine <utmp.h> . use clean <sys/reboot.h> instead of <minix/reboot.h> . implement TIOCSCTTY for use by getty so getty can get controlling terminal from init's child(ren) . allow NULL envp for exec Change-Id: I5ca02cb4230857140c08794bbfeba7df982c58a3
276 lines
7 KiB
C
276 lines
7 KiB
C
/* $NetBSD: wall.c,v 1.29 2011/09/06 18:45:21 joerg Exp $ */
|
|
|
|
/*
|
|
* 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. 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>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
|
|
The Regents of the University of California. All rights reserved.");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
|
|
#endif
|
|
__RCSID("$NetBSD: wall.c,v 1.29 2011/09/06 18:45:21 joerg Exp $");
|
|
#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>
|
|
|
|
#include <ctype.h>
|
|
#include <err.h>
|
|
#include <grp.h>
|
|
#include <errno.h>
|
|
#include <paths.h>
|
|
#include <pwd.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <util.h>
|
|
|
|
#include "utmpentry.h"
|
|
|
|
#include "term_chk.h"
|
|
|
|
static void addgroup(char *);
|
|
static void makemsg(const char *);
|
|
__dead static void usage(void);
|
|
|
|
static struct wallgroup {
|
|
gid_t gid;
|
|
char *name;
|
|
char **mem;
|
|
struct wallgroup *next;
|
|
} *grouplist;
|
|
|
|
static int nobanner;
|
|
static size_t mbufsize;
|
|
static char *mbuf;
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int ch;
|
|
struct iovec iov;
|
|
char *p, **mem;
|
|
struct utmpentry *ep;
|
|
gid_t egid;
|
|
struct wallgroup *wg;
|
|
struct passwd *pw;
|
|
|
|
setprogname(argv[0]);
|
|
egid = getegid();
|
|
if (setegid(getgid()) == -1)
|
|
err(1, "setegid");
|
|
pw = getpwnam("nobody");
|
|
|
|
(void)check_sender(NULL, getuid(), egid);
|
|
|
|
while ((ch = getopt(argc, argv, "g:n")) != -1)
|
|
switch (ch) {
|
|
case 'n':
|
|
/* undoc option for shutdown: suppress banner */
|
|
if (geteuid() == 0 || (pw && getuid() == pw->pw_uid))
|
|
nobanner = 1;
|
|
break;
|
|
case 'g':
|
|
addgroup(optarg);
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (argc > 1)
|
|
usage();
|
|
|
|
makemsg(*argv);
|
|
|
|
iov.iov_base = mbuf;
|
|
iov.iov_len = mbufsize;
|
|
(void)getutentries(NULL, &ep);
|
|
(void)setegid(egid);
|
|
for (; ep; ep = ep->next) {
|
|
if (grouplist) {
|
|
int ingroup;
|
|
|
|
ingroup = 0;
|
|
pw = getpwnam(ep->name);
|
|
if (!pw)
|
|
continue;
|
|
for (wg = grouplist; wg && !ingroup; wg = wg->next) {
|
|
if (wg->gid == pw->pw_gid)
|
|
ingroup = 1;
|
|
for (mem = wg->mem; *mem && !ingroup; mem++)
|
|
if (strcmp(ep->name, *mem) == 0)
|
|
ingroup = 1;
|
|
}
|
|
if (ingroup == 0)
|
|
continue;
|
|
}
|
|
|
|
/* skip [xgk]dm/xserver entries (":0", ":1", etc.) */
|
|
if (ep->line[0] == ':' && isdigit((unsigned char)ep->line[1]))
|
|
continue;
|
|
|
|
if ((p = ttymsg(&iov, 1, ep->line, 60*5)) != NULL)
|
|
warnx("%s", p);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
static void
|
|
addgroup(char *name)
|
|
{
|
|
int i;
|
|
struct group *grp;
|
|
struct wallgroup *g;
|
|
|
|
grp = getgrnam(name);
|
|
if ((grp = getgrnam(name)) == NULL)
|
|
errx(1, "unknown group `%s'", name);
|
|
for (i = 0; grp->gr_mem[i]; i++)
|
|
continue;
|
|
|
|
g = (struct wallgroup *)malloc(sizeof *g);
|
|
if (g == NULL)
|
|
err(1, "malloc");
|
|
g->gid = grp->gr_gid;
|
|
g->name = name;
|
|
g->mem = (char **)malloc(i + 1);
|
|
if (g->mem == NULL)
|
|
err(1, "malloc");
|
|
for (i = 0; grp->gr_mem[i] != NULL; i++) {
|
|
g->mem[i] = strdup(grp->gr_mem[i]);
|
|
if (g->mem[i] == NULL)
|
|
err(1, "malloc");
|
|
}
|
|
g->mem[i] = NULL;
|
|
g->next = grouplist;
|
|
grouplist = g;
|
|
}
|
|
|
|
static void
|
|
makemsg(const char *fname)
|
|
{
|
|
int ch, cnt;
|
|
struct tm *lt;
|
|
struct passwd *pw;
|
|
struct stat sbuf;
|
|
time_t now;
|
|
FILE *fp;
|
|
int fd;
|
|
const char *whom, *tty;
|
|
char *p, tmpname[MAXPATHLEN], lbuf[100],
|
|
hostname[MAXHOSTNAMELEN+1];
|
|
|
|
(void)snprintf(tmpname, sizeof tmpname, "%s/wall.XXXXXX", _PATH_TMP);
|
|
if ((fd = mkstemp(tmpname)) == -1)
|
|
err(1, "can't open temporary file");
|
|
(void)unlink(tmpname);
|
|
if (!(fp = fdopen(fd, "r+")))
|
|
err(1, "can't open temporary file");
|
|
|
|
if (!nobanner) {
|
|
if (!(whom = getlogin()))
|
|
whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
|
|
(void)gethostname(hostname, sizeof(hostname));
|
|
hostname[sizeof(hostname) - 1] = '\0';
|
|
(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);
|
|
tty = ttyname(STDERR_FILENO);
|
|
if (tty == NULL)
|
|
tty = "??";
|
|
(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 && !(freopen(fname, "r", stdin)))
|
|
err(1, "can't read %s", fname);
|
|
while (fgets(lbuf, sizeof(lbuf), stdin))
|
|
for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
|
|
if (cnt == 79 || ch == '\n') {
|
|
for (; cnt < 79; ++cnt)
|
|
putc(' ', fp);
|
|
putc('\r', fp);
|
|
putc('\n', fp);
|
|
cnt = -1;
|
|
}
|
|
if (ch != '\n')
|
|
putc(ch, fp);
|
|
}
|
|
(void)fprintf(fp, "%79s\r\n", " ");
|
|
rewind(fp);
|
|
|
|
if (fstat(fd, &sbuf))
|
|
err(1, "can't stat temporary file");
|
|
if ((uint64_t)sbuf.st_size > SIZE_T_MAX)
|
|
errx(1, "file too big");
|
|
mbufsize = sbuf.st_size;
|
|
if (!(mbuf = malloc(mbufsize)))
|
|
err(1, "malloc");
|
|
if (fread(mbuf, 1, mbufsize, fp) != mbufsize)
|
|
err(1, "can't read temporary file");
|
|
(void)fclose(fp);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
|
|
(void)fprintf(stderr, "usage: %s [-g group] [file]\n", getprogname());
|
|
exit(1);
|
|
}
|