Edit File: talkd.h
/* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)talkd.h 8.1 (Berkeley) 6/2/93 */ #ifndef _PROTOCOLS_TALKD_H #define _PROTOCOLS_TALKD_H 1 /* * This describes the protocol used by the talk server and clients. * * The talk server acts a repository of invitations, responding to * requests by clients wishing to rendezvous for the purpose of * holding a conversation. In normal operation, a client, the caller, * initiates a rendezvous by sending a CTL_MSG to the server of * type LOOK_UP. This causes the server to search its invitation * tables to check if an invitation currently exists for the caller * (to speak to the callee specified in the message). If the lookup * fails, the caller then sends an ANNOUNCE message causing the server * to broadcast an announcement on the callee's login ports requesting * contact. When the callee responds, the local server uses the * recorded invitation to respond with the appropriate rendezvous * address and the caller and callee client programs establish a * stream connection through which the conversation takes place. */ #include <sys/types.h> #include <sys/socket.h> #include <stdint.h> #include <bits/types/struct_osockaddr.h> /* * Client->server request message format. */ typedef struct { unsigned char vers; /* protocol version */ unsigned char type; /* request type, see below */ unsigned char answer; /* not used */ unsigned char pad; uint32_t id_num; /* message id */ struct osockaddr addr; /* old (4.3) style */ struct osockaddr ctl_addr; /* old (4.3) style */ int32_t pid; /* caller's process id */ #define NAME_SIZE 12 char l_name[NAME_SIZE];/* caller's name */ char r_name[NAME_SIZE];/* callee's name */ #define TTY_SIZE 16 char r_tty[TTY_SIZE];/* callee's tty name */ } CTL_MSG; /* * Server->client response message format. */ typedef struct { unsigned char vers; /* protocol version */ unsigned char type; /* type of request message, see below */ unsigned char answer; /* response to request message, see below */ unsigned char pad; uint32_t id_num; /* message id */ struct osockaddr addr; /* address for establishing conversation */ } CTL_RESPONSE; #define TALK_VERSION 1 /* protocol version */ /* message type values */ #define LEAVE_INVITE 0 /* leave invitation with server */ #define LOOK_UP 1 /* check for invitation by callee */ #define DELETE 2 /* delete invitation by caller */ #define ANNOUNCE 3 /* announce invitation by caller */ /* answer values */ #define SUCCESS 0 /* operation completed properly */ #define NOT_HERE 1 /* callee not logged in */ #define FAILED 2 /* operation failed for unexplained reason */ #define MACHINE_UNKNOWN 3 /* caller's machine name unknown */ #define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */ #define UNKNOWN_REQUEST 5 /* request has invalid type value */ #define BADVERSION 6 /* request has invalid protocol version */ #define BADADDR 7 /* request has invalid addr value */ #define BADCTLADDR 8 /* request has invalid ctl_addr value */ /* * Operational parameters. */ #define MAX_LIFE 60 /* max time daemon saves invitations */ /* RING_WAIT should be 10's of seconds less than MAX_LIFE */ #define RING_WAIT 30 /* time to wait before resending invitation */ #endif /* protocols/talkd.h */
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