1 /*!\file protocol/talkd.h
2 * Talk server/client definitions.
5 /* $NetBSD: talkd.h,v 1.5 1995/03/04 07:59:30 cgd Exp $ */
8 * Copyright (c) 1983 Regents of the University of California.
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21 * This product includes software developed by the University of
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39 * @(#)talkd.h 5.7 (Berkeley) 4/3/91
42 #ifndef __PROTOCOL_TALKD_H
43 #define __PROTOCOL_TALKD_H
46 * This describes the protocol used by the talk server and clients.
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.
63 #include <sys/packon.h>
66 * Client->server request message format.
69 u_char vers; /* protocol version */
70 u_char type; /* request type, see below */
71 u_char answer; /* not used */
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 */
78 char l_name[NAME_SIZE]; /* caller's name */
79 char r_name[NAME_SIZE]; /* callee's name */
81 char r_tty[TTY_SIZE]; /* callee's tty name */
85 * Server->client response message format.
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 */
92 u_int32_t id_num; /* message id */
93 struct osockaddr addr; /* address for establishing conversation */
96 #include <sys/packoff.h>
98 #define TALK_VERSION 1 /* protocol version */
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 */
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 */
118 * Operational parameters.
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 */