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- #ifndef PROTOCOLS_TALKD_H
- #define PROTOCOLS_TALKD_H \
- "$Id: talkd.h,v 1.1.1.1 2001/11/26 22:21:18 tboeckel Exp $"
- /*
- * Talk protocol
- *
- * Copyright © 1994 AmiTCP/IP Group,
- * Network Solutions Development, Inc.
- * All rights reserved.
- */
-
- /*
- * 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.
- */
-
- /*
- * Client->server request message format.
- */
- typedef struct {
- u_char vers; /* protocol version */
- u_char type; /* request type, see below */
- u_char answer; /* not used */
- u_char pad;
- u_long id_num; /* message id */
- struct osockaddr addr; /* old (4.3) style */
- struct osockaddr ctl_addr; /* old (4.3) style */
- long 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 {
- u_char vers; /* protocol version */
- u_char type; /* type of request message, see below */
- u_char answer; /* respose to request message, see below */
- u_char pad;
- u_long 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 */
-