1 /* $OpenBSD: talkd.h,v 1.5 2015/01/21 02:23:14 guenther Exp $ */ 2 /* $NetBSD: talkd.h,v 1.5 1995/03/04 07:59:30 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1983 Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)talkd.h 5.7 (Berkeley) 4/3/91 33 */ 34 35 #ifndef _TALKD_H_ 36 #define _TALKD_H_ 37 38 /* 39 * This describes the protocol used by the talk server and clients. 40 * 41 * The talk server acts a repository of invitations, responding to 42 * requests by clients wishing to rendezvous for the purpose of 43 * holding a conversation. In normal operation, a client, the caller, 44 * initiates a rendezvous by sending a CTL_MSG to the server of 45 * type LOOK_UP. This causes the server to search its invitation 46 * tables to check if an invitation currently exists for the caller 47 * (to speak to the callee specified in the message). If the lookup 48 * fails, the caller then sends an ANNOUNCE message causing the server 49 * to broadcast an announcement on the callee's login ports requesting 50 * contact. When the callee responds, the local server uses the 51 * recorded invitation to respond with the appropriate rendezvous 52 * address and the caller and callee client programs establish a 53 * stream connection through which the conversation takes place. 54 */ 55 56 struct osockaddr { 57 unsigned short sa_family; /* address family */ 58 char sa_data[14]; /* up to 14 bytes of direct address */ 59 }; 60 61 /* 62 * Client->server request message format. 63 */ 64 typedef struct { 65 unsigned char vers; /* protocol version */ 66 unsigned char type; /* request type, see below */ 67 unsigned char answer; /* not used */ 68 unsigned char pad; 69 u_int32_t id_num; /* message id */ 70 struct osockaddr addr; /* old (4.3) style */ 71 struct osockaddr ctl_addr; /* old (4.3) style */ 72 int32_t pid; /* caller's process id */ 73 #define NAME_SIZE 12 74 char l_name[NAME_SIZE]; /* caller's name */ 75 char r_name[NAME_SIZE]; /* callee's name */ 76 #define TTY_SIZE 16 77 char r_tty[TTY_SIZE]; /* callee's tty name */ 78 } CTL_MSG; 79 80 /* 81 * Server->client response message format. 82 */ 83 typedef struct { 84 unsigned char vers; /* protocol version */ 85 unsigned char type; /* type of request message, see below */ 86 unsigned char answer; /* response to request message, 87 see below */ 88 unsigned char pad; 89 u_int32_t id_num; /* message id */ 90 struct osockaddr addr; /* address for establishing 91 conversation */ 92 } CTL_RESPONSE; 93 94 #define TALK_VERSION 1 /* protocol version */ 95 96 /* message type values */ 97 #define LEAVE_INVITE 0 /* leave invitation with server */ 98 #define LOOK_UP 1 /* check for invitation by callee */ 99 #define DELETE 2 /* delete invitation by caller */ 100 #define ANNOUNCE 3 /* announce invitation by caller */ 101 102 /* answer values */ 103 #define SUCCESS 0 /* operation completed properly */ 104 #define NOT_HERE 1 /* callee not logged in */ 105 #define FAILED 2 /* operation failed for unexplained reason */ 106 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 107 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 108 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 109 #define BADVERSION 6 /* request has invalid protocol version */ 110 #define BADADDR 7 /* request has invalid addr value */ 111 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 112 113 /* 114 * Operational parameters. 115 */ 116 #define MAX_LIFE 60 /* max time daemon saves invitations */ 117 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 118 #define RING_WAIT 30 /* time to wait before resending invitation */ 119 120 #endif /* !_TALKD_H_ */ 121