149e4bd942
Because our implementation guarantees the strings inside struct utmpx to be null terminated, we don't need to copy everything out, which makes the code nicer to read. Also set WARNS to 6 and add $FreeBSD$ to keep SVN silent.
310 lines
7.4 KiB
C
310 lines
7.4 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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#define _ULOG_POSIX_NAMES
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#include <ulog.h>
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#include <unistd.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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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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int nobanner;
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int mbufsize;
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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()
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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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unsigned char 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 *p, hostname[MAXHOSTNAMELEN], lbuf[256], tmpname[64];
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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)fprintf(fp, "\r%79s\r\n", " ");
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(void)snprintf(lbuf, sizeof(lbuf),
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"Broadcast Message from %s@%s",
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whom, hostname);
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(void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
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(void)snprintf(lbuf, sizeof(lbuf),
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" (%s) at %d:%02d %s...", tty,
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lt->tm_hour, lt->tm_min, lt->tm_zone);
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(void)fprintf(fp, "%-79.79s\r\n", lbuf);
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}
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(void)fprintf(fp, "%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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setegid(egid);
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}
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while (fgets(lbuf, sizeof(lbuf), stdin)) {
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for (cnt = 0, p = lbuf; (ch = *p) != '\0'; ++p, ++cnt) {
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if (ch == '\r') {
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putc('\r', fp);
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cnt = 0;
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continue;
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} else if (ch == '\n') {
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for (; cnt < 79; ++cnt)
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putc(' ', fp);
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putc('\r', fp);
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putc('\n', fp);
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break;
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}
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if (cnt == 79) {
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putc('\r', fp);
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putc('\n', fp);
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cnt = 0;
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}
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if (((ch & 0x80) && ch < 0xA0) ||
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/* disable upper controls */
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(!isprint(ch) && !isspace(ch) &&
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ch != '\a' && ch != '\b')
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) {
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if (ch & 0x80) {
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ch &= 0x7F;
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putc('M', fp);
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if (++cnt == 79) {
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putc('\r', fp);
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putc('\n', fp);
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cnt = 0;
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}
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putc('-', fp);
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if (++cnt == 79) {
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putc('\r', fp);
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putc('\n', fp);
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cnt = 0;
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}
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}
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if (iscntrl(ch)) {
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ch ^= 040;
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putc('^', fp);
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if (++cnt == 79) {
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putc('\r', fp);
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putc('\n', fp);
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cnt = 0;
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}
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}
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}
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putc(ch, fp);
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}
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}
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(void)fprintf(fp, "%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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