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137 lines
4.8 KiB
137 lines
4.8 KiB
/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* (BSD License, from tdelibs/doc/common/bsd-license.html)
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*
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* @(#)talkd.h 8.1 (Berkeley) 6/2/93
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*/
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#ifndef _PROTOCOLS_TALKD_H
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#define _PROTOCOLS_TALKD_H
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/*
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* This describes the protocol used by the talk server and clients.
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*
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* The talk server acts a repository of invitations, responding to
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* requests by clients wishing to rendezvous for the purpose of
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* holding a conversation. In normal operation, a client, the caller,
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* initiates a rendezvous by sending a CTL_MSG to the server of
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* type LOOK_UP. This causes the server to search its invitation
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* tables to check if an invitation currently exists for the caller
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* (to speak to the callee specified in the message). If the lookup
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* fails, the caller then sends an ANNOUNCE message causing the server
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* to broadcast an announcement on the callee's login ports requesting
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* contact. When the callee responds, the local server uses the
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* recorded invitation to respond with the appropriate rendezvous
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* address and the caller and callee client programs establish a
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* stream connection through which the conversation takes place.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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#include <sys/types.h>
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/*
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* This is a copy of 4.3BSD struct sockaddr.
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*/
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struct talk_addr {
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uint16_t ta_family;
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uint16_t ta_port;
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uint32_t ta_addr;
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uint32_t ta_junk1;
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uint32_t ta_junk2;
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};
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/*
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* Client->server request message format.
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*/
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#define NAME_SIZE 12
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#define TTY_SIZE 16
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typedef struct {
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uint8_t vers; /* protocol version */
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uint8_t type; /* request type, see below */
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uint8_t answer; /* not used */
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uint8_t pad;
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uint32_t id_num; /* message id */
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struct talk_addr addr; /* address of client tcp port */
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struct talk_addr ctl_addr; /* address of client udp port */
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uint32_t pid; /* caller's process id */
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char l_name[NAME_SIZE];/* caller's name */
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char r_name[NAME_SIZE];/* callee's name */
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char r_tty[TTY_SIZE];/* callee's tty name */
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} CTL_MSG;
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/*
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* Server->client response message format.
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*/
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typedef struct {
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uint8_t vers; /* protocol version */
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uint8_t type; /* type of request message, see below */
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uint8_t answer; /* respose to request message, see below */
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uint8_t pad;
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uint32_t id_num; /* message id */
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struct talk_addr addr; /* address for establishing conversation */
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} CTL_RESPONSE;
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#define TALK_VERSION 1 /* protocol version */
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/* message type values */
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#define LEAVE_INVITE 0 /* leave invitation with server */
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#define LOOK_UP 1 /* check for invitation by callee */
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#define DELETE 2 /* delete invitation by caller */
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#define ANNOUNCE 3 /* announce invitation by caller */
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/* answer values */
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#define SUCCESS 0 /* operation completed properly */
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#define NOT_HERE 1 /* callee not logged in */
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#define FAILED 2 /* operation failed for unexplained reason */
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#define MACHINE_UNKNOWN 3 /* caller's machine name unknown */
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#define PERMISSION_DENIED 4 /* callee's tty doesn't permit announce */
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#define UNKNOWN_REQUEST 5 /* request has invalid type value */
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#define BADVERSION 6 /* request has invalid protocol version */
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#define BADADDR 7 /* request has invalid addr value */
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#define BADCTLADDR 8 /* request has invalid ctl_addr value */
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/*
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* Operational parameters.
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* RING_WAIT should be 10's of seconds less than MAX_LIFE
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*/
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#define MAX_LIFE 60 /* max time daemon saves invitations */
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#define RING_WAIT 30 /* time to wait before resending invitation */
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#endif /* !_PROTOCOLS_TALKD_H */
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