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File: [cvs.NetBSD.org] / src / libexec / talkd / talkd.c (download)

Revision 1.21, Mon Mar 16 01:04:32 2009 UTC (11 years, 10 months ago) by lukem
Branch: MAIN
CVS Tags: yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-1-RELEASE, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, matt-premerge-20091211, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-mips64-premerge-20101231, localcount-20160914, jym-xensuspend-nbase, jym-xensuspend-base, is-mlppp-base, is-mlppp, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, HEAD
Changes since 1.20: +6 -9 lines

ANSI KNF

/*	$NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)talkd.c	8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: talkd.c,v 1.21 2009/03/16 01:04:32 lukem Exp $");
#endif
#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>
#include <sys/param.h>

#include <protocols/talkd.h>

#include <errno.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>

#include "extern.h"

CTL_MSG		request;
CTL_RESPONSE	response;

int	sockt = STDIN_FILENO;
int	debug = 0;
int	logging = 0;
time_t	lastmsgtime;

char	hostname[MAXHOSTNAMELEN + 1];

#define TIMEOUT 30
#define MAXIDLE 120

static void timeout(int);
int	main(int, char *[]);

int
main(int argc, char *argv[])
{
	CTL_MSG *mp = &request;
	int cc, ch;
	struct sockaddr ctl_addr;

	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:
			syslog(LOG_ERR, "Usage: %s [-dl]", getprogname());
			exit(1);
		}

	if (gethostname(hostname, sizeof hostname) < 0) {
		syslog(LOG_ERR, "gethostname: %m");
		_exit(1);
	}
	hostname[MAXHOSTNAMELEN] = '\0';  /* ensure null termination */
	if (chdir(_PATH_DEV) < 0) {
		syslog(LOG_ERR, "chdir: %s: %m", _PATH_DEV);
		_exit(1);
	}
	signal(SIGALRM, timeout);
	alarm(TIMEOUT);
	for (;;) {
		memset(&response, 0, sizeof(response));
		cc = recv(0, (char *)mp, sizeof (*mp), 0);
		if (cc != sizeof (*mp)) {
			if (cc < 0 && errno != EINTR)
				syslog(LOG_WARNING, "recv: %m");
			continue;
		}

		mp->l_name[sizeof(mp->l_name) - 1] = '\0';
		mp->r_name[sizeof(mp->r_name) - 1] = '\0';
		mp->r_tty[sizeof(mp->r_tty) - 1] = '\0';

		lastmsgtime = time(0);
		process_request(mp, &response);

		tsa2sa(&ctl_addr, &mp->ctl_addr);
		if (ctl_addr.sa_family != AF_INET)
			continue;

		/* can block here, is this what I want? */
		cc = sendto(sockt, (char *)&response, sizeof (response), 0,
		    &ctl_addr, sizeof (ctl_addr));
		if (cc != sizeof (response))
			syslog(LOG_WARNING, "sendto: %m");
	}
}

void
timeout(int n)
{
	int save_errno = errno;

	if (time(0) - lastmsgtime >= MAXIDLE)
		_exit(0);
	alarm(TIMEOUT);
	errno = save_errno;
}

void
tsa2sa(struct sockaddr *sa, const struct talkd_sockaddr *tsa)
{
	(void)memcpy(sa, tsa, sizeof(*tsa));
	sa->sa_len = sizeof(*tsa);
	sa->sa_family = tsa->sa_family;
}