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 * 3. 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 * $FreeBSD$ 32 */ 33 34 #ifndef _PROTOCOLS_TALKD_H_ 35 #define _PROTOCOLS_TALKD_H_ 36 37 /* 38 * This describes the protocol used by the talk server and clients. 39 * 40 * The talk server acts a repository of invitations, responding to 41 * requests by clients wishing to rendezvous for the purpose of 42 * holding a conversation. In normal operation, a client, the caller, 43 * initiates a rendezvous by sending a CTL_MSG to the server of 44 * type LOOK_UP. This causes the server to search its invitation 45 * tables to check if an invitation currently exists for the caller 46 * (to speak to the callee specified in the message). If the lookup 47 * fails, the caller then sends an ANNOUNCE message causing the server 48 * to broadcast an announcement on the callee's login ports requesting 49 * contact. When the callee responds, the local server uses the 50 * recorded invitation to respond with the appropriate rendezvous 51 * address and the caller and callee client programs establish a 52 * stream connection through which the conversation takes place. 53 */ 54 55 /* 56 * Client->server request message format. 57 */ 58 typedef struct { 59 u_char vers; /* protocol version */ 60 u_char type; /* request type, see below */ 61 u_char answer; /* not used */ 62 u_char pad; 63 u_int32_t id_num; /* message id */ 64 struct osockaddr addr; /* old (4.3) style */ 65 struct osockaddr ctl_addr; /* old (4.3) style */ 66 int32_t pid; /* caller's process id */ 67 #define NAME_SIZE 12 68 char l_name[NAME_SIZE];/* caller's name */ 69 char r_name[NAME_SIZE];/* callee's name */ 70 #define TTY_SIZE 16 71 char r_tty[TTY_SIZE];/* callee's tty name */ 72 } CTL_MSG; 73 74 /* 75 * Server->client response message format. 76 */ 77 typedef struct { 78 u_char vers; /* protocol version */ 79 u_char type; /* type of request message, see below */ 80 u_char answer; /* respose to request message, see below */ 81 u_char pad; 82 u_int32_t id_num; /* message id */ 83 struct osockaddr addr; /* address for establishing conversation */ 84 } CTL_RESPONSE; 85 86 #define TALK_VERSION 1 /* protocol version */ 87 88 /* message type values */ 89 #define LEAVE_INVITE 0 /* leave invitation with server */ 90 #define LOOK_UP 1 /* check for invitation by callee */ 91 #define DELETE 2 /* delete invitation by caller */ 92 #define ANNOUNCE 3 /* announce invitation by caller */ 93 94 /* answer values */ 95 #define SUCCESS 0 /* operation completed properly */ 96 #define NOT_HERE 1 /* callee not logged in */ 97 #define FAILED 2 /* operation failed for unexplained reason */ 98 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 99 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 100 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 101 #define BADVERSION 6 /* request has invalid protocol version */ 102 #define BADADDR 7 /* request has invalid addr value */ 103 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 104 105 /* 106 * Operational parameters. 107 */ 108 #define MAX_LIFE 60 /* max time daemon saves invitations */ 109 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 110 #define RING_WAIT 30 /* time to wait before resending invitation */ 111 112 #endif /* !_TALKD_H_ */ 113