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Edit File : talkd.h \| Size : 4.71 KB
/* * 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 */ Back

Edit File : talkd.h | Size : 4.71 KB

/*
 * 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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