invite.c

早期freebsd实现

/*-
 * Copyright (c) 1983, 1985
 *	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. 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.
 */

#ifndef lint
static char sccsid[] = "@(#)invite.c	5.1 (Berkeley) 6/6/85";
#endif not lint

#include "talk_ctl.h"
#include <sys/time.h>
#include <signal.h>
#include <setjmp.h>

/*
 * There wasn't an invitation waiting, so send a request containing
 * our sockt address to the remote talk daemon so it can invite
 * him 
 */

/*
 * The msg.id's for the invitations
 * on the local and remote machines.
 * These are used to delete the 
 * invitations.
 */
int	local_id, remote_id;
void	re_invite();
jmp_buf invitebuf;

invite_remote()
{
	int nfd, read_mask, template, new_sockt;
	struct itimerval itimer;
	CTL_RESPONSE response;

	itimer.it_value.tv_sec = RING_WAIT;
	itimer.it_value.tv_usec = 0;
	itimer.it_interval = itimer.it_value;
	if (listen(sockt, 5) != 0)
		p_error("Error on attempt to listen for caller");
	msg.addr = my_addr;
	msg.id_num = -1;		/* an impossible id_num */
	invitation_waiting = 1;
	announce_invite();
	/*
	 * Shut off the automatic messages for a while,
	 * so we can use the interupt timer to resend the invitation
	 */
	end_msgs();
	setitimer(ITIMER_REAL, &itimer, (struct itimerval *)0);
	message("Waiting for your party to respond");
	signal(SIGALRM, re_invite);
	(void) setjmp(invitebuf);
	while ((new_sockt = accept(sockt, 0, 0)) < 0) {
		if (errno == EINTR)
			continue;
		p_error("Unable to connect with your party");
	}
	close(sockt);
	sockt = new_sockt;

	/*
	 * Have the daemons delete the invitations now that we
	 * have connected.
	 */
	current_state = "Waiting for your party to respond";
	start_msgs();

	msg.id_num = local_id;
	ctl_transact(my_machine_addr, msg, DELETE, &response);
	msg.id_num = remote_id;
	ctl_transact(his_machine_addr, msg, DELETE, &response);
	invitation_waiting = 0;
}

/*
 * Routine called on interupt to re-invite the callee
 */
void
re_invite()
{

	message("Ringing your party again");
	current_line++;
	/* force a re-announce */
	msg.id_num = remote_id + 1;
	announce_invite();
	longjmp(invitebuf, 1);
}

/*
 * Transmit the invitation and process the response
 */
announce_invite()
{
	CTL_RESPONSE response;

	current_state = "Trying to connect to your party's talk daemon";
	ctl_transact(his_machine_addr, msg, ANNOUNCE, &response);
	remote_id = response.id_num;
	if (response.answer != SUCCESS) {
		switch (response.answer) {
			
		case NOT_HERE :
			message("Your party is not logged on");
			break;

		case MACHINE_UNKNOWN :
			message("Target machine does not recognize us");
			break;

		case UNKNOWN_REQUEST :
			message("Target machine can not handle remote talk");
			break;

		case FAILED :
			message("Target machine is too confused to talk to us");
			break;

		case PERMISSION_DENIED :
			message("Your party is refusing messages");
			break;
		}
		quit();
	}
	/* leave the actual invitation on my talk daemon */
	ctl_transact(my_machine_addr, msg, LEAVE_INVITE, &response);
	local_id = response.id_num;
}
	
/*
 * Tell the daemon to remove your invitation
 */
send_delete()
{

	msg.type = DELETE;
	/*
	 * This is just a extra clean up, so just send it
	 * and don't wait for an answer
	 */
	msg.id_num = remote_id;
	daemon_addr.sin_addr = his_machine_addr;
	if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0,
	    (struct sockaddr *)&daemon_addr,
	    sizeof(daemon_addr)) != sizeof(CTL_MSG))
		perror("send_delete remote");
	msg.id_num = local_id;
	daemon_addr.sin_addr = my_machine_addr;
	if (sendto(ctl_sockt, &msg, sizeof(CTL_MSG), 0,
	    (struct sockaddr *)&daemon_addr,
	    sizeof(daemon_addr)) != sizeof(CTL_MSG))
		perror("send_delete local");
}