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Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
115 lines
4.6 KiB
C
115 lines
4.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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 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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* 3. 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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*
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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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*
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* @(#)talkd.h 8.1 (Berkeley) 6/2/93
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*
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* $FreeBSD$
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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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/*
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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_int32_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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/*
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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_int32_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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/*
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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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#endif /* !_TALKD_H_ */
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