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1 | /* |
---|---|
2 | * Copyright (c) 1983, 1993 |
3 | * The Regents of the University of California. All rights reserved. |
4 | * |
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 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software |
15 | * without specific prior written permission. |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
27 | * SUCH DAMAGE. |
28 | * |
29 | * @(#)talkd.h 8.1 (Berkeley) 6/2/93 |
30 | */ |
31 | |
32 | #ifndef _PROTOCOLS_TALKD_H |
33 | #define _PROTOCOLS_TALKD_H 1 |
34 | |
35 | /* |
36 | * This describes the protocol used by the talk server and clients. |
37 | * |
38 | * The talk server acts a repository of invitations, responding to |
39 | * requests by clients wishing to rendezvous for the purpose of |
40 | * holding a conversation. In normal operation, a client, the caller, |
41 | * initiates a rendezvous by sending a CTL_MSG to the server of |
42 | * type LOOK_UP. This causes the server to search its invitation |
43 | * tables to check if an invitation currently exists for the caller |
44 | * (to speak to the callee specified in the message). If the lookup |
45 | * fails, the caller then sends an ANNOUNCE message causing the server |
46 | * to broadcast an announcement on the callee's login ports requesting |
47 | * contact. When the callee responds, the local server uses the |
48 | * recorded invitation to respond with the appropriate rendezvous |
49 | * address and the caller and callee client programs establish a |
50 | * stream connection through which the conversation takes place. |
51 | */ |
52 | |
53 | #include <sys/types.h> |
54 | #include <sys/socket.h> |
55 | #include <stdint.h> |
56 | #include <bits/types/struct_osockaddr.h> |
57 | |
58 | /* |
59 | * Client->server request message format. |
60 | */ |
61 | typedef struct { |
62 | unsigned char vers; /* protocol version */ |
63 | unsigned char type; /* request type, see below */ |
64 | unsigned char answer; /* not used */ |
65 | unsigned char pad; |
66 | uint32_t id_num; /* message id */ |
67 | struct osockaddr addr; /* old (4.3) style */ |
68 | struct osockaddr ctl_addr; /* old (4.3) style */ |
69 | int32_t pid; /* caller's process id */ |
70 | #define NAME_SIZE 12 |
71 | char l_name[NAME_SIZE];/* caller's name */ |
72 | char r_name[NAME_SIZE];/* callee's name */ |
73 | #define TTY_SIZE 16 |
74 | char r_tty[TTY_SIZE];/* callee's tty name */ |
75 | } CTL_MSG; |
76 | |
77 | /* |
78 | * Server->client response message format. |
79 | */ |
80 | typedef struct { |
81 | unsigned char vers; /* protocol version */ |
82 | unsigned char type; /* type of request message, see below */ |
83 | unsigned char answer; /* response to request message, see below */ |
84 | unsigned char pad; |
85 | uint32_t id_num; /* message id */ |
86 | struct osockaddr addr; /* address for establishing conversation */ |
87 | } CTL_RESPONSE; |
88 | |
89 | #define TALK_VERSION 1 /* protocol version */ |
90 | |
91 | /* message type values */ |
92 | #define LEAVE_INVITE 0 /* leave invitation with server */ |
93 | #define LOOK_UP 1 /* check for invitation by callee */ |
94 | #define DELETE 2 /* delete invitation by caller */ |
95 | #define ANNOUNCE 3 /* announce invitation by caller */ |
96 | |
97 | /* answer values */ |
98 | #define SUCCESS 0 /* operation completed properly */ |
99 | #define NOT_HERE 1 /* callee not logged in */ |
100 | #define FAILED 2 /* operation failed for unexplained reason */ |
101 | #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ |
102 | #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ |
103 | #define UNKNOWN_REQUEST 5 /* request has invalid type value */ |
104 | #define BADVERSION 6 /* request has invalid protocol version */ |
105 | #define BADADDR 7 /* request has invalid addr value */ |
106 | #define BADCTLADDR 8 /* request has invalid ctl_addr value */ |
107 | |
108 | /* |
109 | * Operational parameters. |
110 | */ |
111 | #define MAX_LIFE 60 /* max time daemon saves invitations */ |
112 | /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ |
113 | #define RING_WAIT 30 /* time to wait before resending invitation */ |
114 | |
115 | #endif /* protocols/talkd.h */ |
116 |
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