GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: libexec/talkd/talkd.c Lines: 0 48 0.0 %
Date: 2017-11-13 Branches: 0 26 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: talkd.c,v 1.25 2016/02/05 10:13:51 mestre Exp $	*/
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/*
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 * Copyright (c) 1983 Regents of the University of California.
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 * 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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/*
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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/socket.h>
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#include <protocols/talkd.h>
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#include <errno.h>
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#include <limits.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 <unistd.h>
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#include "talkd.h"
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int	debug = 0;
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void	timeout(int);
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long	lastmsgtime;
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char	hostname[HOST_NAME_MAX+1];
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#define TIMEOUT 30
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#define MAXIDLE 120
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int
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main(int argc, char *argv[])
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{
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	if (getuid() != 0) {
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		fprintf(stderr, "%s: getuid: not super-user\n", argv[0]);
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		exit(1);
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	}
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	openlog("talkd", LOG_PID, LOG_DAEMON);
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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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	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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	if (argc > 1 && strcmp(argv[1], "-d") == 0)
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		debug = 1;
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	init_table();
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	signal(SIGALRM, timeout);
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	alarm(TIMEOUT);
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	if (pledge("stdio rpath wpath cpath inet dns flock", NULL) == -1) {
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		syslog(LOG_ERR, "pledge: %m");
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		_exit(1);
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	}
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	for (;;) {
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		CTL_RESPONSE response;
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		socklen_t len = sizeof(response.addr);
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		CTL_MSG	request;
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		int cc;
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		struct sockaddr ctl_addr;
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		memset(&response, 0, sizeof(response));
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		cc = recvfrom(STDIN_FILENO, (char *)&request,
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		    sizeof(request), 0, (struct sockaddr *)&response.addr,
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		    &len);
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		if (cc != sizeof(request)) {
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			if (cc < 0 && errno != EINTR)
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				syslog(LOG_WARNING, "recvfrom: %m");
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			continue;
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		}
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		/* Force NUL termination */
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		request.l_name[sizeof(request.l_name) - 1] = '\0';
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		request.r_name[sizeof(request.r_name) - 1] = '\0';
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		request.r_tty[sizeof(request.r_tty) - 1] = '\0';
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		memcpy(&ctl_addr, &request.ctl_addr, sizeof(ctl_addr));
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		ctl_addr.sa_family = ntohs(request.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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		lastmsgtime = time(0);
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		process_request(&request, &response);
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		/* can block here, is this what I want? */
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		cc = sendto(STDOUT_FILENO, (char *)&response,
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		    sizeof(response), 0, &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(int signo)
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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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}