161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* $NetBSD: talkd.c,v 1.17 2003/08/07 09:46:51 agc Exp $ */
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/*
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* Copyright (c) 1983, 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) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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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[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: talkd.c,v 1.17 2003/08/07 09:46:51 agc Exp $");
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#endif
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#endif /* not lint */
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/*
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* The top level of the daemon, the format is heavily borrowed
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* from rwhod.c. Basically: find out who and where you are;
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* disconnect all descriptors and ttys, and then endless
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* loop on waiting for and processing requests
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/param.h>
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#include <protocols/talkd.h>
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#include <errno.h>
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#include <paths.h>
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#include <signal.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 <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include "extern.h"
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CTL_MSG request;
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CTL_RESPONSE response;
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int sockt = STDIN_FILENO;
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int debug = 0;
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int logging = 0;
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long lastmsgtime;
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char hostname[MAXHOSTNAMELEN + 1];
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#define TIMEOUT 30
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#define MAXIDLE 120
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static void timeout __P((int));
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int main __P((int, char *[]));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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CTL_MSG *mp = &request;
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int cc, ch;
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struct sockaddr ctl_addr;
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openlog("talkd", LOG_PID, LOG_DAEMON);
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while ((ch = getopt(argc, argv, "dl")) != -1)
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switch (ch) {
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case 'd':
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debug = 1;
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break;
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case 'l':
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logging = 1;
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break;
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default:
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syslog(LOG_ERR, "Usage: %s [-dl]", getprogname());
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exit(1);
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}
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if (gethostname(hostname, sizeof hostname) < 0) {
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syslog(LOG_ERR, "gethostname: %m");
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_exit(1);
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}
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hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */
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if (chdir(_PATH_DEV) < 0) {
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syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
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_exit(1);
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}
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signal(SIGALRM, timeout);
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alarm(TIMEOUT);
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for (;;) {
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memset(&response, 0, sizeof(response));
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cc = recv(0, (char *)mp, sizeof (*mp), 0);
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if (cc != sizeof (*mp)) {
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if (cc < 0 && errno != EINTR)
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syslog(LOG_WARNING, "recv: %m");
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continue;
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}
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mp->l_name[sizeof(mp->l_name) - 1] = '\0';
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mp->r_name[sizeof(mp->r_name) - 1] = '\0';
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mp->r_tty[sizeof(mp->r_tty) - 1] = '\0';
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lastmsgtime = time(0);
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process_request(mp, &response);
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(void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr));
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ctl_addr.sa_family = mp->ctl_addr.sa_family;
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ctl_addr.sa_len = sizeof(ctl_addr);
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if (ctl_addr.sa_family != AF_INET)
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continue;
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/* can block here, is this what I want? */
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cc = sendto(sockt, (char *)&response, sizeof (response), 0,
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&ctl_addr, sizeof (ctl_addr));
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if (cc != sizeof (response))
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syslog(LOG_WARNING, "sendto: %m");
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}
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}
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void
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timeout(n)
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int n;
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{
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int save_errno = errno;
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if (time(0) - lastmsgtime >= MAXIDLE)
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_exit(0);
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alarm(TIMEOUT);
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errno = save_errno;
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}
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