xref: /freebsd/usr.bin/talk/ctl.c (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71)
1  /*-
2   * SPDX-License-Identifier: BSD-3-Clause
3   *
4   * Copyright (c) 1983, 1993
5   *	The Regents of the University of California.  All rights reserved.
6   *
7   * Redistribution and use in source and binary forms, with or without
8   * modification, are permitted provided that the following conditions
9   * are met:
10   * 1. Redistributions of source code must retain the above copyright
11   *    notice, this list of conditions and the following disclaimer.
12   * 2. Redistributions in binary form must reproduce the above copyright
13   *    notice, this list of conditions and the following disclaimer in the
14   *    documentation and/or other materials provided with the distribution.
15   * 3. Neither the name of the University nor the names of its contributors
16   *    may be used to endorse or promote products derived from this software
17   *    without specific prior written permission.
18   *
19   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29   * SUCH DAMAGE.
30   */
31  
32  #include <sys/cdefs.h>
33  
34  __FBSDID("$FreeBSD$");
35  
36  #ifndef lint
37  static const char sccsid[] = "@(#)ctl.c	8.1 (Berkeley) 6/6/93";
38  #endif
39  
40  /*
41   * This file handles haggling with the various talk daemons to
42   * get a socket to talk to. sockt is opened and connected in
43   * the progress
44   */
45  
46  #include <sys/types.h>
47  #include <sys/socket.h>
48  
49  #include <string.h>
50  
51  #include "talk.h"
52  #include "talk_ctl.h"
53  
54  struct	sockaddr_in daemon_addr = { .sin_len = sizeof(daemon_addr), .sin_family = AF_INET };
55  struct	sockaddr_in ctl_addr = { .sin_len = sizeof(ctl_addr), .sin_family = AF_INET };
56  struct	sockaddr_in my_addr = { .sin_len = sizeof(my_addr), .sin_family = AF_INET };
57  
58  	/* inet addresses of the two machines */
59  struct	in_addr my_machine_addr;
60  struct	in_addr his_machine_addr;
61  
62  u_short daemon_port;	/* port number of the talk daemon */
63  
64  int	ctl_sockt;
65  int	sockt;
66  int	invitation_waiting = 0;
67  
68  CTL_MSG msg;
69  
70  void
71  open_sockt(void)
72  {
73  	socklen_t length;
74  
75  	(void)memset(&my_addr, 0, sizeof(my_addr));
76  	my_addr.sin_family = AF_INET;
77  	my_addr.sin_len = sizeof(my_addr);
78  	my_addr.sin_addr = my_machine_addr;
79  	my_addr.sin_port = 0;
80  	sockt = socket(AF_INET, SOCK_STREAM, 0);
81  	if (sockt == -1)
82  		p_error("Bad socket");
83  	if (bind(sockt, (struct sockaddr *)&my_addr, sizeof(my_addr)) != 0)
84  		p_error("Binding local socket");
85  	length = sizeof(my_addr);
86  	if (getsockname(sockt, (struct sockaddr *)&my_addr, &length) == -1)
87  		p_error("Bad address for socket");
88  }
89  
90  /* open the ctl socket */
91  void
92  open_ctl(void)
93  {
94  	socklen_t length;
95  
96  	(void)memset(&ctl_addr, 0, sizeof(ctl_addr));
97  	ctl_addr.sin_family = AF_INET;
98  	ctl_addr.sin_len = sizeof(my_addr);
99  	ctl_addr.sin_port = 0;
100  	ctl_addr.sin_addr = my_machine_addr;
101  	ctl_sockt = socket(AF_INET, SOCK_DGRAM, 0);
102  	if (ctl_sockt == -1)
103  		p_error("Bad socket");
104  	if (bind(ctl_sockt,
105  	    (struct sockaddr *)&ctl_addr, sizeof(ctl_addr)) != 0)
106  		p_error("Couldn't bind to control socket");
107  	length = sizeof(ctl_addr);
108  	if (getsockname(ctl_sockt,
109  	    (struct sockaddr *)&ctl_addr, &length) == -1)
110  		p_error("Bad address for ctl socket");
111  }
112  
113  /* print_addr is a debug print routine */
114  void
115  print_addr(struct sockaddr_in addr)
116  {
117  	int i;
118  
119  	printf("addr = %lx, port = %o, family = %o zero = ",
120  		(u_long)addr.sin_addr.s_addr, addr.sin_port, addr.sin_family);
121  	for (i = 0; i<8;i++)
122  	printf("%o ", (int)addr.sin_zero[i]);
123  	putchar('\n');
124  }
125