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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
5c4d2881 | 3 | * All rights reserved. |
d0aeaf5a | 4 | * |
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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 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
5c4d2881 | 20 | * |
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21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | * | |
33 | * @(#)talkd.h 5.7 (Berkeley) 4/3/91 | |
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34 | */ |
35 | ||
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36 | #ifndef _TALKD_H_ |
37 | #define _TALKD_H_ | |
38 | ||
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39 | /* |
40 | * This describes the protocol used by the talk server and clients. | |
41 | * | |
42 | * The talk server acts a repository of invitations, responding to | |
43 | * requests by clients wishing to rendezvous for the purpose of | |
44 | * holding a conversation. In normal operation, a client, the caller, | |
45 | * initiates a rendezvous by sending a CTL_MSG to the server of | |
46 | * type LOOK_UP. This causes the server to search its invitation | |
47 | * tables to check if an invitation currently exists for the caller | |
48 | * (to speak to the callee specified in the message). If the lookup | |
49 | * fails, the caller then sends an ANNOUNCE message causing the server | |
50 | * to broadcast an announcement on the callee's login ports requesting | |
51 | * contact. When the callee responds, the local server uses the | |
52 | * recorded invitation to respond with the appropriate rendezvous | |
53 | * address and the caller and callee client programs establish a | |
54 | * stream connection through which the conversation takes place. | |
55 | */ | |
212b2321 | 56 | |
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57 | /* |
58 | * Client->server request message format. | |
59 | */ | |
60 | typedef struct { | |
61 | u_char vers; /* protocol version */ | |
62 | u_char type; /* request type, see below */ | |
63 | u_char answer; /* not used */ | |
64 | u_char pad; | |
65 | u_long id_num; /* message id */ | |
53799aeb MK |
66 | struct osockaddr addr; /* old (4.3) style */ |
67 | struct osockaddr ctl_addr; /* old (4.3) style */ | |
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68 | long pid; /* caller's process id */ |
69 | #define NAME_SIZE 12 | |
70 | char l_name[NAME_SIZE];/* caller's name */ | |
71 | char r_name[NAME_SIZE];/* callee's name */ | |
963ce42e | 72 | #define TTY_SIZE 16 |
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73 | char r_tty[TTY_SIZE];/* callee's tty name */ |
74 | } CTL_MSG; | |
963ce42e | 75 | |
595cdd5e KM |
76 | /* |
77 | * Server->client response message format. | |
78 | */ | |
79 | typedef struct { | |
80 | u_char vers; /* protocol version */ | |
81 | u_char type; /* type of request message, see below */ | |
82 | u_char answer; /* respose to request message, see below */ | |
83 | u_char pad; | |
84 | u_long id_num; /* message id */ | |
53799aeb | 85 | struct osockaddr addr; /* address for establishing conversation */ |
595cdd5e | 86 | } CTL_RESPONSE; |
963ce42e | 87 | |
595cdd5e | 88 | #define TALK_VERSION 1 /* protocol version */ |
963ce42e | 89 | |
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90 | /* message type values */ |
91 | #define LEAVE_INVITE 0 /* leave invitation with server */ | |
92 | #define LOOK_UP 1 /* check for invitation by callee */ | |
93 | #define DELETE 2 /* delete invitation by caller */ | |
94 | #define ANNOUNCE 3 /* announce invitation by caller */ | |
963ce42e | 95 | |
595cdd5e KM |
96 | /* answer values */ |
97 | #define SUCCESS 0 /* operation completed properly */ | |
98 | #define NOT_HERE 1 /* callee not logged in */ | |
99 | #define FAILED 2 /* operation failed for unexplained reason */ | |
100 | #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ | |
101 | #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ | |
102 | #define UNKNOWN_REQUEST 5 /* request has invalid type value */ | |
103 | #define BADVERSION 6 /* request has invalid protocol version */ | |
104 | #define BADADDR 7 /* request has invalid addr value */ | |
105 | #define BADCTLADDR 8 /* request has invalid ctl_addr value */ | |
963ce42e | 106 | |
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107 | /* |
108 | * Operational parameters. | |
109 | */ | |
110 | #define MAX_LIFE 60 /* max time daemon saves invitations */ | |
111 | /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ | |
112 | #define RING_WAIT 30 /* time to wait before resending invitation */ | |
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113 | |
114 | #endif /* !_TALKD_H_ */ |