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[glibc.git] / inet / protocols / talkd.h
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1 /*
2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
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 * 4. 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.
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.
29 * @(#)talkd.h 8.1 (Berkeley) 6/2/93
32 #ifndef _PROTOCOLS_TALKD_H
33 #define _PROTOCOLS_TALKD_H 1
36 * This describes the protocol used by the talk server and clients.
38 * The talk server acts a repository of invitations, responding to
39 * requests by clients wishing to rendezvous for the purpose of
40 * holding a conversation. In normal operation, a client, the caller,
41 * initiates a rendezvous by sending a CTL_MSG to the server of
42 * type LOOK_UP. This causes the server to search its invitation
43 * tables to check if an invitation currently exists for the caller
44 * (to speak to the callee specified in the message). If the lookup
45 * fails, the caller then sends an ANNOUNCE message causing the server
46 * to broadcast an announcement on the callee's login ports requesting
47 * contact. When the callee responds, the local server uses the
48 * recorded invitation to respond with the appropriate rendezvous
49 * address and the caller and callee client programs establish a
50 * stream connection through which the conversation takes place.
53 #include <sys/types.h>
54 #include <sys/socket.h>
57 * Client->server request message format.
59 typedef struct {
60 u_char vers; /* protocol version */
61 u_char type; /* request type, see below */
62 u_char answer; /* not used */
63 u_char pad;
64 u_int32_t id_num; /* message id */
65 struct osockaddr addr; /* old (4.3) style */
66 struct osockaddr ctl_addr; /* old (4.3) style */
67 int32_t pid; /* caller's process id */
68 #define NAME_SIZE 12
69 char l_name[NAME_SIZE];/* caller's name */
70 char r_name[NAME_SIZE];/* callee's name */
71 #define TTY_SIZE 16
72 char r_tty[TTY_SIZE];/* callee's tty name */
73 } CTL_MSG;
76 * Server->client response message format.
78 typedef struct {
79 u_char vers; /* protocol version */
80 u_char type; /* type of request message, see below */
81 u_char answer; /* response to request message, see below */
82 u_char pad;
83 u_int32_t id_num; /* message id */
84 struct osockaddr addr; /* address for establishing conversation */
85 } CTL_RESPONSE;
87 #define TALK_VERSION 1 /* protocol version */
89 /* message type values */
90 #define LEAVE_INVITE 0 /* leave invitation with server */
91 #define LOOK_UP 1 /* check for invitation by callee */
92 #define DELETE 2 /* delete invitation by caller */
93 #define ANNOUNCE 3 /* announce invitation by caller */
95 /* answer values */
96 #define SUCCESS 0 /* operation completed properly */
97 #define NOT_HERE 1 /* callee not logged in */
98 #define FAILED 2 /* operation failed for unexplained reason */
99 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
100 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
101 #define UNKNOWN_REQUEST 5 /* request has invalid type value */
102 #define BADVERSION 6 /* request has invalid protocol version */
103 #define BADADDR 7 /* request has invalid addr value */
104 #define BADCTLADDR 8 /* request has invalid ctl_addr value */
107 * Operational parameters.
109 #define MAX_LIFE 60 /* max time daemon saves invitations */
110 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
111 #define RING_WAIT 30 /* time to wait before resending invitation */
113 #endif /* protocols/talkd.h */