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mirror of https://git.FreeBSD.org/src.git synced 2024-12-23 11:18:54 +00:00
freebsd/usr.bin/wall/wall.c
Olivier Houchard b457a3e19c In wall and who, check that the utmp entry isn't stalled, as it is done in w.
Apparently with the new pts code stalled entries are printed, when they are
not with the BSD ptys.

Submitted by:	Michal Mertl <mime at traveller dot cz>
2006-02-21 13:01:00 +00:00

310 lines
7.7 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;
static int
ttystat(char *line, int sz)
{
struct stat sb;
char ttybuf[MAXPATHLEN];
(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
if (stat(ttybuf, &sb) == 0) {
return (0);
} else
return (-1);
}
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 (ttystat(utmp.ut_line, UT_LINESIZE) != 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);
}