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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)talkd.h 8.1 (Berkeley) 6/2/93 34 */ 35 36 #ifndef _PROTOCOLS_TALKD_H_ 37 #define _PROTOCOLS_TALKD_H_ 38 39 /* 40 * This describes the protocol used by the talk server and clients. 41 * 42 * The talk server acts a repository of invitations, responding to 43 * requests by clients wishing to rendezvous for the purpose of 44 * holding a conversation. In normal operation, a client, the caller, 45 * initiates a rendezvous by sending a CTL_MSG to the server of 46 * type LOOK_UP. This causes the server to search its invitation 47 * tables to check if an invitation currently exists for the caller 48 * (to speak to the callee specified in the message). If the lookup 49 * fails, the caller then sends an ANNOUNCE message causing the server 50 * to broadcast an announcement on the callee's login ports requesting 51 * contact. When the callee responds, the local server uses the 52 * recorded invitation to respond with the appropriate rendezvous 53 * address and the caller and callee client programs establish a 54 * stream connection through which the conversation takes place. 55 */ 56 57 /* 58 * Client->server request message format. 59 */ 60 typedef struct { 61 u_char vers; /* protocol version */ 62 u_char type; /* request type, see below */ 63 u_char answer; /* not used */ 64 u_char pad; 65 u_int32_t id_num; /* message id */ 66 struct osockaddr addr; /* old (4.3) style */ 67 struct osockaddr ctl_addr; /* old (4.3) style */ 68 int32_t pid; /* caller's process id */ 69 #define NAME_SIZE 12 70 char l_name[NAME_SIZE];/* caller's name */ 71 char r_name[NAME_SIZE];/* callee's name */ 72 #define TTY_SIZE 16 73 char r_tty[TTY_SIZE];/* callee's tty name */ 74 } CTL_MSG; 75 76 /* 77 * Server->client response message format. 78 */ 79 typedef struct { 80 u_char vers; /* protocol version */ 81 u_char type; /* type of request message, see below */ 82 u_char answer; /* respose to request message, see below */ 83 u_char pad; 84 u_int32_t id_num; /* message id */ 85 struct osockaddr addr; /* address for establishing conversation */ 86 } CTL_RESPONSE; 87 88 #define TALK_VERSION 1 /* protocol version */ 89 90 /* message type values */ 91 #define LEAVE_INVITE 0 /* leave invitation with server */ 92 #define LOOK_UP 1 /* check for invitation by callee */ 93 #define DELETE 2 /* delete invitation by caller */ 94 #define ANNOUNCE 3 /* announce invitation by caller */ 95 96 /* answer values */ 97 #define SUCCESS 0 /* operation completed properly */ 98 #define NOT_HERE 1 /* callee not logged in */ 99 #define FAILED 2 /* operation failed for unexplained reason */ 100 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 101 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 102 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 103 #define BADVERSION 6 /* request has invalid protocol version */ 104 #define BADADDR 7 /* request has invalid addr value */ 105 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 106 107 /* 108 * Operational parameters. 109 */ 110 #define MAX_LIFE 60 /* max time daemon saves invitations */ 111 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 112 #define RING_WAIT 30 /* time to wait before resending invitation */ 113 114 #endif /* !_TALKD_H_ */ 115