1 /* $NetBSD: talkd.h,v 1.11 2016/01/22 23:11:50 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)talkd.h 8.1 (Berkeley) 6/2/93 32 */ 33 34 #ifndef _PROTOCOLS_TALKD_H_ 35 #define _PROTOCOLS_TALKD_H_ 36 37 #include <stdint.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 * 4.3 compat sockaddr 59 */ 60 struct talkd_sockaddr { 61 uint16_t sa_family; /* address family */ 62 char sa_data[14]; /* up to 14 bytes of direct address */ 63 }; 64 65 /* 66 * Client->server request message format. 67 */ 68 typedef struct { 69 unsigned char vers; /* protocol version */ 70 unsigned char type; /* request type, see below */ 71 unsigned char answer; /* not used */ 72 unsigned char pad; 73 uint32_t id_num; /* message id */ 74 struct talkd_sockaddr addr; /* old (4.3) style */ 75 struct talkd_sockaddr ctl_addr;/* old (4.3) style */ 76 int32_t pid; /* caller's process id */ 77 #define NAME_SIZE 12 78 char l_name[NAME_SIZE]; /* caller's name */ 79 char r_name[NAME_SIZE]; /* callee's name */ 80 #define TTY_SIZE 16 81 char r_tty[TTY_SIZE]; /* callee's tty name */ 82 } CTL_MSG; 83 84 /* 85 * Server->client response message format. 86 */ 87 typedef struct { 88 unsigned char vers; /* protocol version */ 89 unsigned char type; /* type of request message, see below */ 90 unsigned char answer; /* respose to request message, see below */ 91 unsigned char pad; 92 uint32_t id_num; /* message id */ 93 struct talkd_sockaddr addr; /* address for establishing conversation */ 94 } CTL_RESPONSE; 95 96 #define TALK_VERSION 1 /* protocol version */ 97 98 /* message type values */ 99 #define LEAVE_INVITE 0 /* leave invitation with server */ 100 #define LOOK_UP 1 /* check for invitation by callee */ 101 #define DELETE 2 /* delete invitation by caller */ 102 #define ANNOUNCE 3 /* announce invitation by caller */ 103 104 /* answer values */ 105 #define SUCCESS 0 /* operation completed properly */ 106 #define NOT_HERE 1 /* callee not logged in */ 107 #define FAILED 2 /* operation failed for unexplained reason */ 108 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 109 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 110 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 111 #define BADVERSION 6 /* request has invalid protocol version */ 112 #define BADADDR 7 /* request has invalid addr value */ 113 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 114 115 /* 116 * Operational parameters. 117 */ 118 #define MAX_LIFE 60 /* max time daemon saves invitations */ 119 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 120 #define RING_WAIT 30 /* time to wait before resending invitation */ 121 122 #endif /* !_PROTOCOLS_TALKD_H_ */ 123