96 lines
3.7 KiB
C
96 lines
3.7 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)talkd.h 5.3 (Berkeley) 7/9/88
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*/
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#include <sys/types.h>
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#include <sys/socket.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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/*
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* Client->server request message format.
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*/
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typedef struct {
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u_char vers; /* protocol version */
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u_char type; /* request type, see below */
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u_char answer; /* not used */
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u_char pad;
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u_long id_num; /* message id */
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struct sockaddr addr;
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struct sockaddr ctl_addr;
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long 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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/*
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* Server->client response message format.
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*/
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typedef struct {
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u_char vers; /* protocol version */
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u_char type; /* type of request message, see below */
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u_char answer; /* respose to request message, see below */
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u_char pad;
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u_long id_num; /* message id */
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struct sockaddr 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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*/
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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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