50e04779c4
current version of FreeBSD, this isn't guarenteed by the API. Custom security modules, or future implementations of the setuid and setgid may fail. Submitted by: Erik Cederstrand Approved by: cperciva MFC after: 3 days
293 lines
7.1 KiB
C
293 lines
7.1 KiB
C
/*
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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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*
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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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* are met:
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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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* 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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*
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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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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1990, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#ifndef lint
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static const char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
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#endif
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/*
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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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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <ctype.h>
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#include <err.h>
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#include <grp.h>
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#include <locale.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <utmpx.h>
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#include <wchar.h>
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#include <wctype.h>
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#include "ttymsg.h"
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static void makemsg(char *);
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static void usage(void);
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static struct wallgroup {
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struct wallgroup *next;
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char *name;
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gid_t gid;
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} *grouplist;
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static int nobanner;
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static int mbufsize;
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static char *mbuf;
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static int
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ttystat(char *line)
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{
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struct stat sb;
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char ttybuf[MAXPATHLEN];
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(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
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if (stat(ttybuf, &sb) == 0) {
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return (0);
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} else
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return (-1);
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}
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int
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main(int argc, char *argv[])
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{
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struct iovec iov;
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struct utmpx *utmp;
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int ch;
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int ingroup;
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struct wallgroup *g;
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struct group *grp;
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char **np;
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const char *p;
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struct passwd *pw;
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(void)setlocale(LC_CTYPE, "");
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while ((ch = getopt(argc, argv, "g:n")) != -1)
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switch (ch) {
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case 'n':
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/* undoc option for shutdown: suppress banner */
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if (geteuid() == 0)
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nobanner = 1;
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break;
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case 'g':
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g = (struct wallgroup *)malloc(sizeof *g);
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g->next = grouplist;
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g->name = optarg;
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g->gid = -1;
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grouplist = g;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc > 1)
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usage();
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for (g = grouplist; g; g = g->next) {
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grp = getgrnam(g->name);
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if (grp != NULL)
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g->gid = grp->gr_gid;
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else
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warnx("%s: no such group", g->name);
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}
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makemsg(*argv);
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iov.iov_base = mbuf;
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iov.iov_len = mbufsize;
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/* NOSTRICT */
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while ((utmp = getutxent()) != NULL) {
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if (utmp->ut_type != USER_PROCESS)
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continue;
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if (ttystat(utmp->ut_line) != 0)
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continue;
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if (grouplist) {
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ingroup = 0;
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pw = getpwnam(utmp->ut_user);
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if (!pw)
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continue;
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for (g = grouplist; g && ingroup == 0; g = g->next) {
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if (g->gid == (gid_t)-1)
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continue;
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if (g->gid == pw->pw_gid)
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ingroup = 1;
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else if ((grp = getgrgid(g->gid)) != NULL) {
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for (np = grp->gr_mem; *np; np++) {
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if (strcmp(*np, utmp->ut_user) == 0) {
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ingroup = 1;
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break;
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}
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}
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}
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}
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if (ingroup == 0)
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continue;
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}
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if ((p = ttymsg(&iov, 1, utmp->ut_line, 60*5)) != NULL)
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warnx("%s", p);
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}
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exit(0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: wall [-g group] [file]\n");
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exit(1);
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}
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void
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makemsg(char *fname)
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{
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int cnt;
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wchar_t ch;
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struct tm *lt;
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struct passwd *pw;
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struct stat sbuf;
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time_t now;
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FILE *fp;
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int fd;
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char hostname[MAXHOSTNAMELEN], tmpname[64];
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wchar_t *p, *tmp, lbuf[256], codebuf[13];
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const char *tty;
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const char *whom;
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gid_t egid;
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(void)snprintf(tmpname, sizeof(tmpname), "%s/wall.XXXXXX", _PATH_TMP);
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if ((fd = mkstemp(tmpname)) == -1 || !(fp = fdopen(fd, "r+")))
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err(1, "can't open temporary file");
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(void)unlink(tmpname);
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if (!nobanner) {
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tty = ttyname(STDERR_FILENO);
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if (tty == NULL)
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tty = "no tty";
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if (!(whom = getlogin()))
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whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
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(void)gethostname(hostname, sizeof(hostname));
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(void)time(&now);
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lt = localtime(&now);
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/*
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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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*/
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(void)fwprintf(fp, L"\r%79s\r\n", " ");
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(void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t),
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L"Broadcast Message from %s@%s",
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whom, hostname);
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(void)fwprintf(fp, L"%-79.79S\007\007\r\n", lbuf);
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(void)swprintf(lbuf, sizeof(lbuf)/sizeof(wchar_t),
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L" (%s) at %d:%02d %s...", tty,
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lt->tm_hour, lt->tm_min, lt->tm_zone);
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(void)fwprintf(fp, L"%-79.79S\r\n", lbuf);
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}
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(void)fwprintf(fp, L"%79s\r\n", " ");
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if (fname) {
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egid = getegid();
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setegid(getgid());
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if (freopen(fname, "r", stdin) == NULL)
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err(1, "can't read %s", fname);
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if (setegid(egid) != 0)
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err(1, "setegid failed");
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}
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cnt = 0;
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while (fgetws(lbuf, sizeof(lbuf)/sizeof(wchar_t), stdin)) {
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for (p = lbuf; (ch = *p) != L'\0'; ++p, ++cnt) {
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if (ch == L'\r') {
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putwc(L'\r', fp);
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cnt = 0;
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continue;
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} else if (ch == L'\n') {
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for (; cnt < 79; ++cnt)
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putwc(L' ', fp);
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putwc(L'\r', fp);
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putwc(L'\n', fp);
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break;
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}
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if (cnt == 79) {
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putwc(L'\r', fp);
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putwc(L'\n', fp);
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cnt = 0;
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}
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if (iswprint(ch) || iswspace(ch) || ch == L'\a' || ch == L'\b') {
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putwc(ch, fp);
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} else {
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(void)swprintf(codebuf, sizeof(codebuf)/sizeof(wchar_t), L"<0x%X>", ch);
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for (tmp = codebuf; *tmp != L'\0'; ++tmp) {
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putwc(*tmp, fp);
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if (++cnt == 79) {
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putwc(L'\r', fp);
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putwc(L'\n', fp);
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cnt = 0;
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}
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}
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--cnt;
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}
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}
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}
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(void)fwprintf(fp, L"%79s\r\n", " ");
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rewind(fp);
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if (fstat(fd, &sbuf))
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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)))
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err(1, "out of memory");
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if ((int)fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize)
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err(1, "can't read temporary file");
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(void)close(fd);
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}
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