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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
5c4d2881 | 3 | * All rights reserved. |
d0aeaf5a | 4 | * |
269a7923 | 5 | * %sccs.include.redist.c% |
5c4d2881 | 6 | * |
d2b7358e | 7 | * @(#)talkd.h 5.7 (Berkeley) %G% |
212b2321 MK |
8 | */ |
9 | ||
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10 | #ifndef _TALKD_H_ |
11 | #define _TALKD_H_ | |
12 | ||
595cdd5e KM |
13 | /* |
14 | * This describes the protocol used by the talk server and clients. | |
15 | * | |
16 | * The talk server acts a repository of invitations, responding to | |
17 | * requests by clients wishing to rendezvous for the purpose of | |
18 | * holding a conversation. In normal operation, a client, the caller, | |
19 | * initiates a rendezvous by sending a CTL_MSG to the server of | |
20 | * type LOOK_UP. This causes the server to search its invitation | |
21 | * tables to check if an invitation currently exists for the caller | |
22 | * (to speak to the callee specified in the message). If the lookup | |
23 | * fails, the caller then sends an ANNOUNCE message causing the server | |
24 | * to broadcast an announcement on the callee's login ports requesting | |
25 | * contact. When the callee responds, the local server uses the | |
26 | * recorded invitation to respond with the appropriate rendezvous | |
27 | * address and the caller and callee client programs establish a | |
28 | * stream connection through which the conversation takes place. | |
29 | */ | |
212b2321 | 30 | |
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31 | /* |
32 | * Client->server request message format. | |
33 | */ | |
34 | typedef struct { | |
35 | u_char vers; /* protocol version */ | |
36 | u_char type; /* request type, see below */ | |
37 | u_char answer; /* not used */ | |
38 | u_char pad; | |
39 | u_long id_num; /* message id */ | |
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40 | struct osockaddr addr; /* old (4.3) style */ |
41 | struct osockaddr ctl_addr; /* old (4.3) style */ | |
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42 | long pid; /* caller's process id */ |
43 | #define NAME_SIZE 12 | |
44 | char l_name[NAME_SIZE];/* caller's name */ | |
45 | char r_name[NAME_SIZE];/* callee's name */ | |
963ce42e | 46 | #define TTY_SIZE 16 |
595cdd5e KM |
47 | char r_tty[TTY_SIZE];/* callee's tty name */ |
48 | } CTL_MSG; | |
963ce42e | 49 | |
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50 | /* |
51 | * Server->client response message format. | |
52 | */ | |
53 | typedef struct { | |
54 | u_char vers; /* protocol version */ | |
55 | u_char type; /* type of request message, see below */ | |
56 | u_char answer; /* respose to request message, see below */ | |
57 | u_char pad; | |
58 | u_long id_num; /* message id */ | |
53799aeb | 59 | struct osockaddr addr; /* address for establishing conversation */ |
595cdd5e | 60 | } CTL_RESPONSE; |
963ce42e | 61 | |
595cdd5e | 62 | #define TALK_VERSION 1 /* protocol version */ |
963ce42e | 63 | |
595cdd5e KM |
64 | /* message type values */ |
65 | #define LEAVE_INVITE 0 /* leave invitation with server */ | |
66 | #define LOOK_UP 1 /* check for invitation by callee */ | |
67 | #define DELETE 2 /* delete invitation by caller */ | |
68 | #define ANNOUNCE 3 /* announce invitation by caller */ | |
963ce42e | 69 | |
595cdd5e KM |
70 | /* answer values */ |
71 | #define SUCCESS 0 /* operation completed properly */ | |
72 | #define NOT_HERE 1 /* callee not logged in */ | |
73 | #define FAILED 2 /* operation failed for unexplained reason */ | |
74 | #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ | |
75 | #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ | |
76 | #define UNKNOWN_REQUEST 5 /* request has invalid type value */ | |
77 | #define BADVERSION 6 /* request has invalid protocol version */ | |
78 | #define BADADDR 7 /* request has invalid addr value */ | |
79 | #define BADCTLADDR 8 /* request has invalid ctl_addr value */ | |
963ce42e | 80 | |
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81 | /* |
82 | * Operational parameters. | |
83 | */ | |
84 | #define MAX_LIFE 60 /* max time daemon saves invitations */ | |
85 | /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ | |
86 | #define RING_WAIT 30 /* time to wait before resending invitation */ | |
d2b7358e KB |
87 | |
88 | #endif /* !_TALKD_H_ */ |