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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * Copyright (c) 1983, 1993
24: * The Regents of the University of California. All rights reserved.
25: *
26: * Redistribution and use in source and binary forms, with or without
27: * modification, are permitted provided that the following conditions
28: * are met:
29: * 1. Redistributions of source code must retain the above copyright
30: * notice, this list of conditions and the following disclaimer.
31: * 2. Redistributions in binary form must reproduce the above copyright
32: * notice, this list of conditions and the following disclaimer in the
33: * documentation and/or other materials provided with the distribution.
34: * 3. All advertising materials mentioning features or use of this software
35: * must display the following acknowledgement:
36: * This product includes software developed by the University of
37: * California, Berkeley and its contributors.
38: * 4. Neither the name of the University nor the names of its contributors
39: * may be used to endorse or promote products derived from this software
40: * without specific prior written permission.
41: *
42: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
43: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
44: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
45: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
46: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
47: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
48: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
49: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
51: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52: * SUCH DAMAGE.
53: *
54: * @(#)talkd.h 8.1 (Berkeley) 6/2/93
55: */
56:
57: #ifndef _TALKD_H_
58: #define _TALKD_H_
59:
60: /*
61: * This describes the protocol used by the talk server and clients.
62: *
63: * The talk server acts a repository of invitations, responding to
64: * requests by clients wishing to rendezvous for the purpose of
65: * holding a conversation. In normal operation, a client, the caller,
66: * initiates a rendezvous by sending a CTL_MSG to the server of
67: * type LOOK_UP. This causes the server to search its invitation
68: * tables to check if an invitation currently exists for the caller
69: * (to speak to the callee specified in the message). If the lookup
70: * fails, the caller then sends an ANNOUNCE message causing the server
71: * to broadcast an announcement on the callee's login ports requesting
72: * contact. When the callee responds, the local server uses the
73: * recorded invitation to respond with the appropriate rendezvous
74: * address and the caller and callee client programs establish a
75: * stream connection through which the conversation takes place.
76: */
77:
78: /*
79: * Client->server request message format.
80: */
81: typedef struct {
82: u_char vers; /* protocol version */
83: u_char type; /* request type, see below */
84: u_char answer; /* not used */
85: u_char pad;
86: u_long id_num; /* message id */
87: struct osockaddr addr; /* old (4.3) style */
88: struct osockaddr ctl_addr; /* old (4.3) style */
89: long pid; /* caller's process id */
90: #define NAME_SIZE 12
91: char l_name[NAME_SIZE];/* caller's name */
92: char r_name[NAME_SIZE];/* callee's name */
93: #define TTY_SIZE 16
94: char r_tty[TTY_SIZE];/* callee's tty name */
95: } CTL_MSG;
96:
97: /*
98: * Server->client response message format.
99: */
100: typedef struct {
101: u_char vers; /* protocol version */
102: u_char type; /* type of request message, see below */
103: u_char answer; /* respose to request message, see below */
104: u_char pad;
105: u_long id_num; /* message id */
106: struct osockaddr addr; /* address for establishing conversation */
107: } CTL_RESPONSE;
108:
109: #define TALK_VERSION 1 /* protocol version */
110:
111: /* message type values */
112: #define LEAVE_INVITE 0 /* leave invitation with server */
113: #define LOOK_UP 1 /* check for invitation by callee */
114: #define DELETE 2 /* delete invitation by caller */
115: #define ANNOUNCE 3 /* announce invitation by caller */
116:
117: /* answer values */
118: #define SUCCESS 0 /* operation completed properly */
119: #define NOT_HERE 1 /* callee not logged in */
120: #define FAILED 2 /* operation failed for unexplained reason */
121: #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
122: #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
123: #define UNKNOWN_REQUEST 5 /* request has invalid type value */
124: #define BADVERSION 6 /* request has invalid protocol version */
125: #define BADADDR 7 /* request has invalid addr value */
126: #define BADCTLADDR 8 /* request has invalid ctl_addr value */
127:
128: /*
129: * Operational parameters.
130: */
131: #define MAX_LIFE 60 /* max time daemon saves invitations */
132: /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
133: #define RING_WAIT 30 /* time to wait before resending invitation */
134:
135: #endif /* !_TALKD_H_ */
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