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 #include <stdint.h> 56 #include <bits/types/struct_osockaddr.h> 57 58 /* 59 * Client->server request message format. 60 */ 61 typedef struct { 62 unsigned char vers; /* protocol version */ 63 unsigned char type; /* request type, see below */ 64 unsigned char answer; /* not used */ 65 unsigned char pad; 66 uint32_t id_num; /* message id */ 67 struct osockaddr addr; /* old (4.3) style */ 68 struct osockaddr ctl_addr; /* old (4.3) style */ 69 int32_t pid; /* caller's process id */ 70 #define NAME_SIZE 12 71 char l_name[NAME_SIZE];/* caller's name */ 72 char r_name[NAME_SIZE];/* callee's name */ 73 #define TTY_SIZE 16 74 char r_tty[TTY_SIZE];/* callee's tty name */ 75 } CTL_MSG; 76 77 /* 78 * Server->client response message format. 79 */ 80 typedef struct { 81 unsigned char vers; /* protocol version */ 82 unsigned char type; /* type of request message, see below */ 83 unsigned char answer; /* response to request message, see below */ 84 unsigned char pad; 85 uint32_t id_num; /* message id */ 86 struct osockaddr addr; /* address for establishing conversation */ 87 } CTL_RESPONSE; 88 89 #define TALK_VERSION 1 /* protocol version */ 90 91 /* message type values */ 92 #define LEAVE_INVITE 0 /* leave invitation with server */ 93 #define LOOK_UP 1 /* check for invitation by callee */ 94 #define DELETE 2 /* delete invitation by caller */ 95 #define ANNOUNCE 3 /* announce invitation by caller */ 96 97 /* answer values */ 98 #define SUCCESS 0 /* operation completed properly */ 99 #define NOT_HERE 1 /* callee not logged in */ 100 #define FAILED 2 /* operation failed for unexplained reason */ 101 #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ 102 #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ 103 #define UNKNOWN_REQUEST 5 /* request has invalid type value */ 104 #define BADVERSION 6 /* request has invalid protocol version */ 105 #define BADADDR 7 /* request has invalid addr value */ 106 #define BADCTLADDR 8 /* request has invalid ctl_addr value */ 107 108 /* 109 * Operational parameters. 110 */ 111 #define MAX_LIFE 60 /* max time daemon saves invitations */ 112 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ 113 #define RING_WAIT 30 /* time to wait before resending invitation */ 114 115 #endif /* protocols/talkd.h */