xref: /freebsd/usr.bin/talk/ctl.c (revision aa339f1d5df9e38f36a34eb522355c4eebcae6c4)
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 
33 
34 /*
35  * This file handles haggling with the various talk daemons to
36  * get a socket to talk to. sockt is opened and connected in
37  * the progress
38  */
39 
40 #include <sys/types.h>
41 #include <sys/socket.h>
42 
43 #include <string.h>
44 
45 #include "talk.h"
46 #include "talk_ctl.h"
47 
48 struct	sockaddr_in daemon_addr = { .sin_len = sizeof(daemon_addr), .sin_family = AF_INET };
49 struct	sockaddr_in ctl_addr = { .sin_len = sizeof(ctl_addr), .sin_family = AF_INET };
50 struct	sockaddr_in my_addr = { .sin_len = sizeof(my_addr), .sin_family = 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 	socklen_t length;
68 
69 	(void)memset(&my_addr, 0, sizeof(my_addr));
70 	my_addr.sin_family = AF_INET;
71 	my_addr.sin_len = sizeof(my_addr);
72 	my_addr.sin_addr = my_machine_addr;
73 	my_addr.sin_port = 0;
74 	sockt = socket(AF_INET, SOCK_STREAM, 0);
75 	if (sockt == -1)
76 		p_error("Bad socket");
77 	if (bind(sockt, (struct sockaddr *)&my_addr, sizeof(my_addr)) != 0)
78 		p_error("Binding local socket");
79 	length = sizeof(my_addr);
80 	if (getsockname(sockt, (struct sockaddr *)&my_addr, &length) == -1)
81 		p_error("Bad address for socket");
82 }
83 
84 /* open the ctl socket */
85 void
86 open_ctl(void)
87 {
88 	socklen_t length;
89 
90 	(void)memset(&ctl_addr, 0, sizeof(ctl_addr));
91 	ctl_addr.sin_family = AF_INET;
92 	ctl_addr.sin_len = sizeof(my_addr);
93 	ctl_addr.sin_port = 0;
94 	ctl_addr.sin_addr = my_machine_addr;
95 	ctl_sockt = socket(AF_INET, SOCK_DGRAM, 0);
96 	if (ctl_sockt == -1)
97 		p_error("Bad socket");
98 	if (bind(ctl_sockt,
99 	    (struct sockaddr *)&ctl_addr, sizeof(ctl_addr)) != 0)
100 		p_error("Couldn't bind to control socket");
101 	length = sizeof(ctl_addr);
102 	if (getsockname(ctl_sockt,
103 	    (struct sockaddr *)&ctl_addr, &length) == -1)
104 		p_error("Bad address for ctl socket");
105 }
106 
107 /* print_addr is a debug print routine */
108 void
109 print_addr(struct sockaddr_in addr)
110 {
111 	int i;
112 
113 	printf("addr = %lx, port = %o, family = %o zero = ",
114 		(u_long)addr.sin_addr.s_addr, addr.sin_port, addr.sin_family);
115 	for (i = 0; i<8;i++)
116 	printf("%o ", (int)addr.sin_zero[i]);
117 	putchar('\n');
118 }
119