usr.bin/talk/ctl.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)ctl.c    8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: src/usr.bin/talk/ctl.c,v 1.6 1999/08/28 01:06:10 peter Exp $
  35  * $DragonFly: src/usr.bin/talk/ctl.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
  36  */
  37
  38 /*
  39  * This file handles haggling with the various talk daemons to
  40  * get a socket to talk to. sockt is opened and connected in
  41  * the progress
  42  */
  43
  44 #include <sys/types.h>
  45 #include <sys/socket.h>
  46 #include "talk.h"
  47
  48 struct  sockaddr_in daemon_addr = { sizeof(daemon_addr), AF_INET };
  49 struct  sockaddr_in ctl_addr = { sizeof(ctl_addr), AF_INET };
  50 struct  sockaddr_in my_addr = { sizeof(my_addr), AF_INET };
  51
  52         /* inet addresses of the two machines */
  53 struct  in_addr my_machine_addr;
  54 struct  in_addr his_machine_addr;
  55
  56 u_short daemon_port;    /* port number of the talk daemon */
  57
  58 int     ctl_sockt;
  59 int     sockt;
  60 int     invitation_waiting = 0;
  61
  62 CTL_MSG msg;
  63
  64 void
  65 open_sockt(void)
  66 {
  67         int length;
  68
  69         my_addr.sin_addr = my_machine_addr;
  70         my_addr.sin_port = 0;
  71         sockt = socket(AF_INET, SOCK_STREAM, 0);
  72         if (sockt <= 0)
  73                 p_error("Bad socket");
  74         if (bind(sockt, (struct sockaddr *)&my_addr, sizeof(my_addr)) != 0)
  75                 p_error("Binding local socket");
  76         length = sizeof(my_addr);
  77         if (getsockname(sockt, (struct sockaddr *)&my_addr, &length) == -1)
  78                 p_error("Bad address for socket");
  79 }
  80
  81 /* open the ctl socket */
  82 void
  83 open_ctl(void)
  84 {
  85         int length;
  86
  87         ctl_addr.sin_port = 0;
  88         ctl_addr.sin_addr = my_machine_addr;
  89         ctl_sockt = socket(AF_INET, SOCK_DGRAM, 0);
  90         if (ctl_sockt <= 0)
  91                 p_error("Bad socket");
  92         if (bind(ctl_sockt,
  93             (struct sockaddr *)&ctl_addr, sizeof(ctl_addr)) != 0)
  94                 p_error("Couldn't bind to control socket");
  95         length = sizeof(ctl_addr);
  96         if (getsockname(ctl_sockt,
  97             (struct sockaddr *)&ctl_addr, &length) == -1)
  98                 p_error("Bad address for ctl socket");
  99 }
 100
 101 /* print_addr is a debug print routine */
 102 void
 103 print_addr(struct sockaddr_in addr)
 104 {
 105         int i;
 106
 107         printf("addr = %lx, port = %o, family = %o zero = ",
 108                 (u_long)addr.sin_addr.s_addr, addr.sin_port, addr.sin_family);
 109         for (i = 0; i<8;i++)
 110         printf("%o ", (int)addr.sin_zero[i]);
 111         putchar('\n');
 112 }