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* Redistribution and use in source and binary forms, with or without

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* modification, are permitted provided that the following conditions

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* are met:

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* 1. Redistributions of source code must retain the above copyright

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* notice, this list of conditions and the following disclaimer.

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* 2. Redistributions in binary form must reproduce the above copyright

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* notice, this list of conditions and the following disclaimer in the

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* documentation and/or other materials provided with the distribution.

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* 4. Neither the name of the University nor the names of its contributors

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* may be used to endorse or promote products derived from this software

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* without specific prior written permission.

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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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* SUCH DAMAGE.

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* @(#)talkd.h 8.1 (Berkeley) 6/2/93

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#ifndef _PROTOCOLS_TALKD_H

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#define _PROTOCOLS_TALKD_H 1

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* This describes the protocol used by the talk server and clients.

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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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#include <sys/types.h>

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#include <sys/socket.h>

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#include <stdint.h>

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#include <bits/types/struct_osockaddr.h>

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* Client->server request message format.

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typedef struct {

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unsigned char vers; /* protocol version */

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unsigned char type; /* request type, see below */

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unsigned char answer; /* not used */

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unsigned char pad;

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uint32_t id_num; /* message id */

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struct osockaddr addr; /* old (4.3) style */

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struct osockaddr ctl_addr; /* old (4.3) style */

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int32_t pid; /* caller's process id */

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#define NAME_SIZE 12

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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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#define TTY_SIZE 16

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char r_tty[TTY_SIZE];/* callee's tty name */

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} CTL_MSG;

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* Server->client response message format.

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typedef struct {

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unsigned char vers; /* protocol version */

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unsigned char type; /* type of request message, see below */

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unsigned char answer; /* response to request message, see below */

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unsigned char pad;

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uint32_t id_num; /* message id */

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struct osockaddr 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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* Operational parameters.

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#define MAX_LIFE 60 /* max time daemon saves invitations */

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/* RING_WAIT should be 10's of seconds less than MAX_LIFE */

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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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