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Annotation of XNU/bsd/include/protocols/talkd.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1983, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)talkd.h     8.1 (Berkeley) 6/2/93
        !            55:  */
        !            56: 
        !            57: #ifndef _TALKD_H_
        !            58: #define        _TALKD_H_
        !            59: 
        !            60: /*
        !            61:  * This describes the protocol used by the talk server and clients.
        !            62:  *
        !            63:  * The talk server acts a repository of invitations, responding to
        !            64:  * requests by clients wishing to rendezvous for the purpose of
        !            65:  * holding a conversation.  In normal operation, a client, the caller,
        !            66:  * initiates a rendezvous by sending a CTL_MSG to the server of
        !            67:  * type LOOK_UP.  This causes the server to search its invitation
        !            68:  * tables to check if an invitation currently exists for the caller
        !            69:  * (to speak to the callee specified in the message).  If the lookup
        !            70:  * fails, the caller then sends an ANNOUNCE message causing the server
        !            71:  * to broadcast an announcement on the callee's login ports requesting
        !            72:  * contact.  When the callee responds, the local server uses the
        !            73:  * recorded invitation to respond with the appropriate rendezvous
        !            74:  * address and the caller and callee client programs establish a
        !            75:  * stream connection through which the conversation takes place.
        !            76:  */
        !            77: 
        !            78: /*
        !            79:  * Client->server request message format.
        !            80:  */
        !            81: typedef struct {
        !            82:        u_char  vers;           /* protocol version */
        !            83:        u_char  type;           /* request type, see below */
        !            84:        u_char  answer;         /* not used */
        !            85:        u_char  pad;
        !            86:        u_long  id_num;         /* message id */
        !            87:        struct  osockaddr addr;         /* old (4.3) style */
        !            88:        struct  osockaddr ctl_addr;     /* old (4.3) style */
        !            89:        long    pid;            /* caller's process id */
        !            90: #define        NAME_SIZE       12
        !            91:        char    l_name[NAME_SIZE];/* caller's name */
        !            92:        char    r_name[NAME_SIZE];/* callee's name */
        !            93: #define        TTY_SIZE        16
        !            94:        char    r_tty[TTY_SIZE];/* callee's tty name */
        !            95: } CTL_MSG;
        !            96: 
        !            97: /*
        !            98:  * Server->client response message format.
        !            99:  */
        !           100: typedef struct {
        !           101:        u_char  vers;           /* protocol version */
        !           102:        u_char  type;           /* type of request message, see below */
        !           103:        u_char  answer;         /* respose to request message, see below */
        !           104:        u_char  pad;
        !           105:        u_long  id_num;         /* message id */
        !           106:        struct  osockaddr addr; /* address for establishing conversation */
        !           107: } CTL_RESPONSE;
        !           108: 
        !           109: #define        TALK_VERSION    1               /* protocol version */
        !           110: 
        !           111: /* message type values */
        !           112: #define LEAVE_INVITE   0       /* leave invitation with server */
        !           113: #define LOOK_UP                1       /* check for invitation by callee */
        !           114: #define DELETE         2       /* delete invitation by caller */
        !           115: #define ANNOUNCE       3       /* announce invitation by caller */
        !           116: 
        !           117: /* answer values */
        !           118: #define SUCCESS                0       /* operation completed properly */
        !           119: #define NOT_HERE       1       /* callee not logged in */
        !           120: #define FAILED         2       /* operation failed for unexplained reason */
        !           121: #define MACHINE_UNKNOWN        3       /* caller's machine name unknown */
        !           122: #define PERMISSION_DENIED 4    /* callee's tty doesn't permit announce */
        !           123: #define UNKNOWN_REQUEST        5       /* request has invalid type value */
        !           124: #define        BADVERSION      6       /* request has invalid protocol version */
        !           125: #define        BADADDR         7       /* request has invalid addr value */
        !           126: #define        BADCTLADDR      8       /* request has invalid ctl_addr value */
        !           127: 
        !           128: /*
        !           129:  * Operational parameters.
        !           130:  */
        !           131: #define MAX_LIFE       60      /* max time daemon saves invitations */
        !           132: /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
        !           133: #define RING_WAIT      30      /* time to wait before resending invitation */
        !           134: 
        !           135: #endif /* !_TALKD_H_ */

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