606b73cdb5
(ours is patched to not do this) leave in utmp. PR 26168. I'm doing this by testing for ^:[0-9] in the line field of utmp(x), rather than by attempting to stat the device name corresponding to the entry as in Martin's patch, because (1) no valid tty should ever have a name beginning with a colon, and (2) this way we don't silently skip over real ttys that should be there but for some reason have disappeared. (I suppose this might conceivably fail to catch entries for displays connected via XDCMP; however, ~nobody does that any more and XDCMP is a security hole anyhow. If anyone's really concerned about this, let me know.) In the long run we should look into ways of getting "tty" messages to users logged in with an X session and no terminal windows open, as that's probably fairly common for the desktop.
277 lines
6.9 KiB
C
277 lines
6.9 KiB
C
/* $NetBSD: wall.c,v 1.27 2009/02/15 06:06:55 dholland Exp $ */
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/*
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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. 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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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)wall.c 8.2 (Berkeley) 11/16/93";
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#endif
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__RCSID("$NetBSD: wall.c,v 1.27 2009/02/15 06:06:55 dholland Exp $");
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#endif /* not lint */
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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/time.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 <errno.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 <unistd.h>
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#include <util.h>
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#include "utmpentry.h"
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#include "term_chk.h"
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void addgroup(char *);
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void makemsg(const char *);
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int main(int, char **);
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void usage(void);
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struct wallgroup {
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gid_t gid;
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char *name;
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char **mem;
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struct wallgroup *next;
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} *grouplist;
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int nobanner;
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size_t mbufsize;
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char *mbuf;
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/* ARGSUSED */
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int
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main(int argc, char **argv)
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{
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int ch;
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struct iovec iov;
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char *p, **mem;
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struct utmpentry *ep;
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gid_t egid;
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struct wallgroup *wg;
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struct passwd *pw;
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setprogname(argv[0]);
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egid = getegid();
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if (setegid(getgid()) == -1)
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err(1, "setegid");
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pw = getpwnam("nobody");
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(void)check_sender(NULL, getuid(), egid);
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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 || (pw && getuid() == pw->pw_uid))
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nobanner = 1;
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break;
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case 'g':
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addgroup(optarg);
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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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makemsg(*argv);
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iov.iov_base = mbuf;
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iov.iov_len = mbufsize;
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(void)getutentries(NULL, &ep);
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(void)setegid(egid);
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for (; ep; ep = ep->next) {
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if (grouplist) {
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int ingroup;
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ingroup = 0;
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pw = getpwnam(ep->name);
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if (!pw)
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continue;
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for (wg = grouplist; wg && !ingroup; wg = wg->next) {
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if (wg->gid == pw->pw_gid)
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ingroup = 1;
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for (mem = wg->mem; *mem && !ingroup; mem++)
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if (strcmp(ep->name, *mem) == 0)
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ingroup = 1;
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}
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if (ingroup == 0)
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continue;
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}
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/* skip [xgk]dm/xserver entries (":0", ":1", etc.) */
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if (ep->line[0] == ':' && isdigit((unsigned char)ep->line[1]))
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continue;
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if ((p = ttymsg(&iov, 1, ep->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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void
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addgroup(char *name)
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{
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int i;
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struct group *grp;
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struct wallgroup *g;
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grp = getgrnam(name);
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if ((grp = getgrnam(name)) == NULL)
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errx(1, "unknown group `%s'", name);
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for (i = 0; grp->gr_mem[i]; i++)
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continue;
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g = (struct wallgroup *)malloc(sizeof *g);
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if (g == NULL)
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err(1, "malloc");
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g->gid = grp->gr_gid;
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g->name = name;
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g->mem = (char **)malloc(i + 1);
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if (g->mem == NULL)
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err(1, "malloc");
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for (i = 0; grp->gr_mem[i] != NULL; i++) {
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g->mem[i] = strdup(grp->gr_mem[i]);
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if (g->mem[i] == NULL)
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err(1, "malloc");
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}
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g->mem[i] = NULL;
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g->next = grouplist;
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grouplist = g;
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}
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void
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makemsg(const char *fname)
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{
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int ch, cnt;
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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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const char *whom;
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char *p, *tty, tmpname[MAXPATHLEN], lbuf[100],
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hostname[MAXHOSTNAMELEN+1];
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(void)snprintf(tmpname, sizeof tmpname, "%s/wall.XXXXXX", _PATH_TMP);
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if ((fd = mkstemp(tmpname)) == -1)
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err(1, "can't open temporary file");
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(void)unlink(tmpname);
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if (!(fp = fdopen(fd, "r+")))
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err(1, "can't open temporary file");
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if (!nobanner) {
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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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hostname[sizeof(hostname) - 1] = '\0';
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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", whom, hostname);
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(void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
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tty = ttyname(STDERR_FILENO);
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if (tty == NULL)
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tty = "??";
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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 && !(freopen(fname, "r", stdin)))
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err(1, "can't read %s", fname);
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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 (cnt == 79 || 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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cnt = -1;
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}
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if (ch != '\n')
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putc(ch, fp);
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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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if (sbuf.st_size > SIZE_T_MAX)
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errx(1, "file too big");
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mbufsize = sbuf.st_size;
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if (!(mbuf = malloc(mbufsize)))
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err(1, "malloc");
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if (fread(mbuf, 1, mbufsize, fp) != mbufsize)
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err(1, "can't read temporary file");
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(void)fclose(fp);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-g group] [file]\n", getprogname());
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exit(1);
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}
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