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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Copyright (c) 1983, 1993
27: * The Regents of the University of California. All rights reserved.
28: *
29: * Redistribution and use in source and binary forms, with or without
30: * modification, are permitted provided that the following conditions
31: * are met:
32: * 1. Redistributions of source code must retain the above copyright
33: * notice, this list of conditions and the following disclaimer.
34: * 2. Redistributions in binary form must reproduce the above copyright
35: * notice, this list of conditions and the following disclaimer in the
36: * documentation and/or other materials provided with the distribution.
37: * 3. All advertising materials mentioning features or use of this software
38: * must display the following acknowledgement:
39: * This product includes software developed by the University of
40: * California, Berkeley and its contributors.
41: * 4. Neither the name of the University nor the names of its contributors
42: * may be used to endorse or promote products derived from this software
43: * without specific prior written permission.
44: *
45: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
46: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
49: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55: * SUCH DAMAGE.
56: *
57: * @(#)talkd.h 8.1 (Berkeley) 6/2/93
58: */
59:
60: #ifndef _TALKD_H_
61: #define _TALKD_H_
62:
63: /*
64: * This describes the protocol used by the talk server and clients.
65: *
66: * The talk server acts a repository of invitations, responding to
67: * requests by clients wishing to rendezvous for the purpose of
68: * holding a conversation. In normal operation, a client, the caller,
69: * initiates a rendezvous by sending a CTL_MSG to the server of
70: * type LOOK_UP. This causes the server to search its invitation
71: * tables to check if an invitation currently exists for the caller
72: * (to speak to the callee specified in the message). If the lookup
73: * fails, the caller then sends an ANNOUNCE message causing the server
74: * to broadcast an announcement on the callee's login ports requesting
75: * contact. When the callee responds, the local server uses the
76: * recorded invitation to respond with the appropriate rendezvous
77: * address and the caller and callee client programs establish a
78: * stream connection through which the conversation takes place.
79: */
80:
81: /*
82: * Client->server request message format.
83: */
84: typedef struct {
85: u_char vers; /* protocol version */
86: u_char type; /* request type, see below */
87: u_char answer; /* not used */
88: u_char pad;
89: u_long id_num; /* message id */
90: struct osockaddr addr; /* old (4.3) style */
91: struct osockaddr ctl_addr; /* old (4.3) style */
92: long pid; /* caller's process id */
93: #define NAME_SIZE 12
94: char l_name[NAME_SIZE];/* caller's name */
95: char r_name[NAME_SIZE];/* callee's name */
96: #define TTY_SIZE 16
97: char r_tty[TTY_SIZE];/* callee's tty name */
98: } CTL_MSG;
99:
100: /*
101: * Server->client response message format.
102: */
103: typedef struct {
104: u_char vers; /* protocol version */
105: u_char type; /* type of request message, see below */
106: u_char answer; /* respose to request message, see below */
107: u_char pad;
108: u_long id_num; /* message id */
109: struct osockaddr addr; /* address for establishing conversation */
110: } CTL_RESPONSE;
111:
112: #define TALK_VERSION 1 /* protocol version */
113:
114: /* message type values */
115: #define LEAVE_INVITE 0 /* leave invitation with server */
116: #define LOOK_UP 1 /* check for invitation by callee */
117: #define DELETE 2 /* delete invitation by caller */
118: #define ANNOUNCE 3 /* announce invitation by caller */
119:
120: /* answer values */
121: #define SUCCESS 0 /* operation completed properly */
122: #define NOT_HERE 1 /* callee not logged in */
123: #define FAILED 2 /* operation failed for unexplained reason */
124: #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
125: #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
126: #define UNKNOWN_REQUEST 5 /* request has invalid type value */
127: #define BADVERSION 6 /* request has invalid protocol version */
128: #define BADADDR 7 /* request has invalid addr value */
129: #define BADCTLADDR 8 /* request has invalid ctl_addr value */
130:
131: /*
132: * Operational parameters.
133: */
134: #define MAX_LIFE 60 /* max time daemon saves invitations */
135: /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
136: #define RING_WAIT 30 /* time to wait before resending invitation */
137:
138: #endif /* !_TALKD_H_ */
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