NetBSD/libexec/talkd/talkd.c

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/* $NetBSD: talkd.c,v 1.13 2001/09/27 14:38:58 christos Exp $ */
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/*
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* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
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*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)talkd.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: talkd.c,v 1.13 2001/09/27 14:38:58 christos Exp $");
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#endif
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#endif /* not lint */
/*
* The top level of the daemon, the format is heavily borrowed
* from rwhod.c. Basically: find out who and where you are;
* disconnect all descriptors and ttys, and then endless
* loop on waiting for and processing requests
*/
#include <sys/types.h>
#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>
#include <paths.h>
#include <signal.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include "extern.h"
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CTL_MSG request;
CTL_RESPONSE response;
int sockt = STDIN_FILENO;
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int debug = 0;
int logging = 0;
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long lastmsgtime;
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char hostname[MAXHOSTNAMELEN + 1];
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#define TIMEOUT 30
#define MAXIDLE 120
static void timeout __P((int));
int main __P((int, char *[]));
int
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main(argc, argv)
int argc;
char *argv[];
{
CTL_MSG *mp = &request;
int cc, ch;
struct sockaddr ctl_addr;
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openlog("talkd", LOG_PID, LOG_DAEMON);
while ((ch = getopt(argc, argv, "dl")) != -1)
switch (ch) {
case 'd':
debug = 1;
break;
case 'l':
logging = 1;
break;
default:
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syslog(LOG_ERR, "Usage: %s [-dl]", getprogname());
exit(1);
}
if (gethostname(hostname, sizeof hostname) < 0) {
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syslog(LOG_ERR, "gethostname: %m");
_exit(1);
}
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hostname[MAXHOSTNAMELEN] = '\0'; /* ensure null termination */
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if (chdir(_PATH_DEV) < 0) {
syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
_exit(1);
}
signal(SIGALRM, timeout);
alarm(TIMEOUT);
for (;;) {
cc = recv(0, (char *)mp, sizeof (*mp), 0);
if (cc != sizeof (*mp)) {
if (cc < 0 && errno != EINTR)
syslog(LOG_WARNING, "recv: %m");
continue;
}
lastmsgtime = time(0);
process_request(mp, &response);
(void)memcpy(&ctl_addr, &mp->ctl_addr, sizeof(ctl_addr));
ctl_addr.sa_family = mp->ctl_addr.sa_family;
ctl_addr.sa_len = sizeof(ctl_addr);
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/* can block here, is this what I want? */
cc = sendto(sockt, (char *)&response, sizeof (response), 0,
&ctl_addr, sizeof (ctl_addr));
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if (cc != sizeof (response))
syslog(LOG_WARNING, "sendto: %m");
}
}
void
timeout(n)
int n;
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{
if (time(0) - lastmsgtime >= MAXIDLE)
_exit(0);
alarm(TIMEOUT);
}