ctl.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[] = "@(#)ctl.c	5.1 (Berkeley) 6/6/85";
#endif not lint

/*
 * This file handles haggling with the various talk daemons to
 * get a socket to talk to. sockt is opened and connected in
 * the progress
 */

#include "talk_ctl.h"

struct	sockaddr_in daemon_addr = { AF_INET };
struct	sockaddr_in ctl_addr = { AF_INET };
struct	sockaddr_in my_addr = { AF_INET };

    /* inet addresses of the two machines */
struct	in_addr my_machine_addr;
struct	in_addr his_machine_addr;

u_short daemon_port;	/* port number of the talk daemon */

int	ctl_sockt;
int	sockt;
int	invitation_waiting = 0;

CTL_MSG msg;

open_sockt()
{
    int length;

    my_addr.sin_addr = my_machine_addr;
    my_addr.sin_port = 0;
    sockt = socket(AF_INET, SOCK_STREAM, 0);
    if (sockt <= 0)
	p_error("Bad socket");
    if (bind(sockt, (struct sockaddr *)&my_addr, sizeof(my_addr)) != 0)
	p_error("Binding local socket");
    length = sizeof(my_addr);
    if (getsockname(sockt, (struct sockaddr *)&my_addr, &length) == -1)
	p_error("Bad address for socket");
}

/* open the ctl socket */
open_ctl() 
{
    int length;

    ctl_addr.sin_port = 0;
    ctl_addr.sin_addr = my_machine_addr;
    ctl_sockt = socket(AF_INET, SOCK_DGRAM, 0);
    if (ctl_sockt <= 0)
	p_error("Bad socket");
    if (bind(ctl_sockt, (struct sockaddr *)&ctl_addr, sizeof(ctl_addr)) != 0)
	p_error("Couldn't bind to control socket");
    length = sizeof(ctl_addr);
    if (getsockname(ctl_sockt, (struct sockaddr *)&ctl_addr, &length) == -1)
	p_error("Bad address for ctl socket");
}

/* print_addr is a debug print routine */
print_addr(addr)
struct sockaddr_in addr;
{
    int i;

    printf("addr = %x, port = %o, family = %o zero = ",
	    addr.sin_addr, addr.sin_port, addr.sin_family);
    for (i = 0; i<8;i++)
	printf("%o ", (int)addr.sin_zero[i]);
    putchar('\n');
}