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