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1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
595cdd5e | 6 | * @(#)talkd.h 5.2 (Berkeley) %G% |
212b2321 MK |
7 | */ |
8 | ||
9 | #include <sys/types.h> | |
10 | #include <sys/socket.h> | |
595cdd5e KM |
11 | /* |
12 | * This describes the protocol used by the talk server and clients. | |
13 | * | |
14 | * The talk server acts a repository of invitations, responding to | |
15 | * requests by clients wishing to rendezvous for the purpose of | |
16 | * holding a conversation. In normal operation, a client, the caller, | |
17 | * initiates a rendezvous by sending a CTL_MSG to the server of | |
18 | * type LOOK_UP. This causes the server to search its invitation | |
19 | * tables to check if an invitation currently exists for the caller | |
20 | * (to speak to the callee specified in the message). If the lookup | |
21 | * fails, the caller then sends an ANNOUNCE message causing the server | |
22 | * to broadcast an announcement on the callee's login ports requesting | |
23 | * contact. When the callee responds, the local server uses the | |
24 | * recorded invitation to respond with the appropriate rendezvous | |
25 | * address and the caller and callee client programs establish a | |
26 | * stream connection through which the conversation takes place. | |
27 | */ | |
212b2321 | 28 | |
595cdd5e KM |
29 | /* |
30 | * Client->server request message format. | |
31 | */ | |
32 | typedef struct { | |
33 | u_char vers; /* protocol version */ | |
34 | u_char type; /* request type, see below */ | |
35 | u_char answer; /* not used */ | |
36 | u_char pad; | |
37 | u_long id_num; /* message id */ | |
38 | struct sockaddr addr; | |
39 | struct sockaddr ctl_addr; | |
40 | long pid; /* caller's process id */ | |
41 | #define NAME_SIZE 12 | |
42 | char l_name[NAME_SIZE];/* caller's name */ | |
43 | char r_name[NAME_SIZE];/* callee's name */ | |
963ce42e | 44 | #define TTY_SIZE 16 |
595cdd5e KM |
45 | char r_tty[TTY_SIZE];/* callee's tty name */ |
46 | } CTL_MSG; | |
963ce42e | 47 | |
595cdd5e KM |
48 | /* |
49 | * Server->client response message format. | |
50 | */ | |
51 | typedef struct { | |
52 | u_char vers; /* protocol version */ | |
53 | u_char type; /* type of request message, see below */ | |
54 | u_char answer; /* respose to request message, see below */ | |
55 | u_char pad; | |
56 | u_long id_num; /* message id */ | |
57 | struct sockaddr addr; /* address for establishing conversation */ | |
58 | } CTL_RESPONSE; | |
963ce42e | 59 | |
595cdd5e | 60 | #define TALK_VERSION 1 /* protocol version */ |
963ce42e | 61 | |
595cdd5e KM |
62 | /* message type values */ |
63 | #define LEAVE_INVITE 0 /* leave invitation with server */ | |
64 | #define LOOK_UP 1 /* check for invitation by callee */ | |
65 | #define DELETE 2 /* delete invitation by caller */ | |
66 | #define ANNOUNCE 3 /* announce invitation by caller */ | |
963ce42e | 67 | |
595cdd5e KM |
68 | /* answer values */ |
69 | #define SUCCESS 0 /* operation completed properly */ | |
70 | #define NOT_HERE 1 /* callee not logged in */ | |
71 | #define FAILED 2 /* operation failed for unexplained reason */ | |
72 | #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ | |
73 | #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ | |
74 | #define UNKNOWN_REQUEST 5 /* request has invalid type value */ | |
75 | #define BADVERSION 6 /* request has invalid protocol version */ | |
76 | #define BADADDR 7 /* request has invalid addr value */ | |
77 | #define BADCTLADDR 8 /* request has invalid ctl_addr value */ | |
963ce42e | 78 | |
595cdd5e KM |
79 | /* |
80 | * Operational parameters. | |
81 | */ | |
82 | #define MAX_LIFE 60 /* max time daemon saves invitations */ | |
83 | /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ | |
84 | #define RING_WAIT 30 /* time to wait before resending invitation */ |