Watt-32 tcp/ip  2.2 dev-rel.10
talkd.h
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1 
5 /* $NetBSD: talkd.h,v 1.5 1995/03/04 07:59:30 cgd Exp $ */
6 
7 /*
8  * Copyright (c) 1983 Regents of the University of California.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  * notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in the
18  * documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  * must display the following acknowledgement:
21  * This product includes software developed by the University of
22  * California, Berkeley and its contributors.
23  * 4. Neither the name of the University nor the names of its contributors
24  * may be used to endorse or promote products derived from this software
25  * without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37  * SUCH DAMAGE.
38  *
39  * @(#)talkd.h 5.7 (Berkeley) 4/3/91
40  */
41 
42 #ifndef __PROTOCOL_TALKD_H
43 #define __PROTOCOL_TALKD_H
44 
45 /*
46  * This describes the protocol used by the talk server and clients.
47  *
48  * The talk server acts a repository of invitations, responding to
49  * requests by clients wishing to rendezvous for the purpose of
50  * holding a conversation. In normal operation, a client, the caller,
51  * initiates a rendezvous by sending a CTL_MSG to the server of
52  * type LOOK_UP. This causes the server to search its invitation
53  * tables to check if an invitation currently exists for the caller
54  * (to speak to the callee specified in the message). If the lookup
55  * fails, the caller then sends an ANNOUNCE message causing the server
56  * to broadcast an announcement on the callee's login ports requesting
57  * contact. When the callee responds, the local server uses the
58  * recorded invitation to respond with the appropriate rendezvous
59  * address and the caller and callee client programs establish a
60  * stream connection through which the conversation takes place.
61  */
62 
63 #include <sys/pack_on.h>
64 
65 /*
66  * Client->server request message format.
67  */
68 typedef struct {
69  u_char vers; /* protocol version */
70  u_char type; /* request type, see below */
71  u_char answer; /* not used */
72  u_char pad;
73  u_int32_t id_num; /* message id */
74  struct osockaddr addr; /* old (4.3) style */
75  struct osockaddr ctl_addr; /* old (4.3) style */
76  int32_t pid; /* caller's process id */
77 #define NAME_SIZE 12
78  char l_name[NAME_SIZE]; /* caller's name */
79  char r_name[NAME_SIZE]; /* callee's name */
80 #define TTY_SIZE 16
81  char r_tty[TTY_SIZE]; /* callee's tty name */
82 } CTL_MSG;
83 
84 /*
85  * Server->client response message format.
86  */
87 typedef struct {
88  u_char vers; /* protocol version */
89  u_char type; /* type of request message, see below */
90  u_char answer; /* respose to request message, see below */
91  u_char pad;
92  u_int32_t id_num; /* message id */
93  struct osockaddr addr; /* address for establishing conversation */
94 } CTL_RESPONSE;
95 
96 #include <sys/pack_off.h>
97 
98 #define TALK_VERSION 1 /* protocol version */
99 
100 /* message type values */
101 #define LEAVE_INVITE 0 /* leave invitation with server */
102 #define LOOK_UP 1 /* check for invitation by callee */
103 #define DELETE 2 /* delete invitation by caller */
104 #define ANNOUNCE 3 /* announce invitation by caller */
105 
106 /* answer values */
107 #define SUCCESS 0 /* operation completed properly */
108 #define NOT_HERE 1 /* callee not logged in */
109 #define FAILED 2 /* operation failed for unexplained reason */
110 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
111 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
112 #define UNKNOWN_REQUEST 5 /* request has invalid type value */
113 #define BADVERSION 6 /* request has invalid protocol version */
114 #define BADADDR 7 /* request has invalid addr value */
115 #define BADCTLADDR 8 /* request has invalid ctl_addr value */
116 
117 /*
118  * Operational parameters.
119  */
120 #define MAX_LIFE 60 /* max time daemon saves invitations */
121 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
122 #define RING_WAIT 30 /* time to wait before resending invitation */
123 
124 #endif
Definition: talkd.h:68