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 * $DragonFly: src/include/protocols/talkd.h,v 1.2 2003/09/12 00:43:30 daver Exp $ 31 */ 32 33 #ifndef _PROTOCOLS_TALKD_H_ 34 #define _PROTOCOLS_TALKD_H_ 35 36 /* 37 * This describes the protocol used by the talk server and clients. 38 * 39 * The talk server acts a repository of invitations, responding to 40 * requests by clients wishing to rendezvous for the purpose of 41 * holding a conversation. In normal operation, a client, the caller, 42 * initiates a rendezvous by sending a CTL_MSG to the server of 43 * type LOOK_UP. This causes the server to search its invitation 44 * tables to check if an invitation currently exists for the caller 45 * (to speak to the callee specified in the message). If the lookup 46 * fails, the caller then sends an ANNOUNCE message causing the server 47 * to broadcast an announcement on the callee's login ports requesting 48 * contact. When the callee responds, the local server uses the 49 * recorded invitation to respond with the appropriate rendezvous 50 * address and the caller and callee client programs establish a 51 * stream connection through which the conversation takes place. 52 */ 53 54 /* 55 * XXX: Nothing should explicity reference the structure osockaddr. 56 * It is for binary compatibility only. The talk protocol doesn't 57 * understand this yet. 58 */ 59 struct osockaddr { 60 u_short sa_family; 61 char sa_data[14]; 62 }; 63 64 /* 65 * Client->server request message format. 66 */ 67 typedef struct { 68 u_char vers; /* protocol version */ 69 u_char type; /* request type, see below */ 70 u_char answer; /* not used */ 71 u_char pad; 72 u_int32_t id_num; /* message id */ 73 struct osockaddr addr; /* old (4.3) style */ 74 struct osockaddr ctl_addr; /* old (4.3) style */ 75 int32_t pid; /* caller's process id */ 76 #define NAME_SIZE 12 77 char l_name[NAME_SIZE];/* caller's name */ 78 char r_name[NAME_SIZE];/* callee's name */ 79 #define TTY_SIZE 16 80 char r_tty[TTY_SIZE];/* callee's tty name */ 81 } CTL_MSG; 82 83 /* 84 * Server->client response message format. 85 */ 86 typedef struct { 87 u_char vers; /* protocol version */ 88 u_char type; /* type of request message, see below */ 89 u_char answer; /* respose to request message, see below */ 90 u_char pad; 91 u_int32_t id_num; /* message id */ 92 struct osockaddr addr; /* address for establishing conversation */ 93 } CTL_RESPONSE; 94 95 #define TALK_VERSION 1 /* protocol version */ 96 97 /* message type values */ 98 #define LEAVE_INVITE 0 /* leave invitation with server */ 99 #define LOOK_UP 1 /* check for invitation by callee */ 100 #define DELETE 2 /* delete invitation by caller */ 101 #define ANNOUNCE 3 /* announce invitation by caller */ 102 103 /* answer values */ 104 #define SUCCESS 0 /* operation completed properly */ 105 #define NOT_HERE 1 /* callee not logged in */ 106 #define FAILED 2 /* operation failed for unexplained reason */ 107 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 108 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 109 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 110 #define BADVERSION 6 /* request has invalid protocol version */ 111 #define BADADDR 7 /* request has invalid addr value */ 112 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 113 114 /* 115 * Operational parameters. 116 */ 117 #define MAX_LIFE 60 /* max time daemon saves invitations */ 118 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 119 #define RING_WAIT 30 /* time to wait before resending invitation */ 120 121 #endif /* !_TALKD_H_ */ 122