276 lines
7 KiB
C
276 lines
7 KiB
C
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/* $NetBSD: wall.c,v 1.29 2011/09/06 18:45:21 joerg 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 1.29 2011/09/06 18:45:21 joerg 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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static void addgroup(char *);
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static void makemsg(const char *);
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__dead static void usage(void);
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static 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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static int nobanner;
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static size_t mbufsize;
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static 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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static 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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static 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, *tty;
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char *p, 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 ((uint64_t)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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static 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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