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 56/* 57 * Client->server request message format. 58 */ 59typedef struct { 60 u_char vers; /* protocol version */ 61 u_char type; /* request type, see below */ 62 u_char answer; /* not used */ 63 u_char pad; 64 u_int32_t id_num; /* message id */ 65 struct osockaddr addr; /* old (4.3) style */ 66 struct osockaddr ctl_addr; /* old (4.3) style */ 67 int32_t pid; /* caller's process id */ 68#define NAME_SIZE 12 69 char l_name[NAME_SIZE];/* caller's name */ 70 char r_name[NAME_SIZE];/* callee's name */ 71#define TTY_SIZE 16 72 char r_tty[TTY_SIZE];/* callee's tty name */ 73} CTL_MSG; 74 75/* 76 * Server->client response message format. 77 */ 78typedef struct { 79 u_char vers; /* protocol version */ 80 u_char type; /* type of request message, see below */ 81 u_char answer; /* response to request message, see below */ 82 u_char pad; 83 u_int32_t id_num; /* message id */ 84 struct osockaddr addr; /* address for establishing conversation */ 85} CTL_RESPONSE; 86 87#define TALK_VERSION 1 /* protocol version */ 88 89/* message type values */ 90#define LEAVE_INVITE 0 /* leave invitation with server */ 91#define LOOK_UP 1 /* check for invitation by callee */ 92#define DELETE 2 /* delete invitation by caller */ 93#define ANNOUNCE 3 /* announce invitation by caller */ 94 95/* answer values */ 96#define SUCCESS 0 /* operation completed properly */ 97#define NOT_HERE 1 /* callee not logged in */ 98#define FAILED 2 /* operation failed for unexplained reason */ 99#define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 100#define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 101#define UNKNOWN_REQUEST 5 /* request has invalid type value */ 102#define BADVERSION 6 /* request has invalid protocol version */ 103#define BADADDR 7 /* request has invalid addr value */ 104#define BADCTLADDR 8 /* request has invalid ctl_addr value */ 105 106/* 107 * Operational parameters. 108 */ 109#define MAX_LIFE 60 /* max time daemon saves invitations */ 110/* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 111#define RING_WAIT 30 /* time to wait before resending invitation */ 112 113#endif /* protocols/talkd.h */ 114