include/protocols/talkd.h

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)talkd.h     8.1 (Berkeley) 6/2/93
  34  * $DragonFly: src/include/protocols/talkd.h,v 1.2 2003/09/12 00:43:30 daver Exp $
  35  */
  36
  37 #ifndef _PROTOCOLS_TALKD_H_
  38 #define _PROTOCOLS_TALKD_H_
  39
  40 /*
  41  * This describes the protocol used by the talk server and clients.
  42  *
  43  * The talk server acts a repository of invitations, responding to
  44  * requests by clients wishing to rendezvous for the purpose of
  45  * holding a conversation.  In normal operation, a client, the caller,
  46  * initiates a rendezvous by sending a CTL_MSG to the server of
  47  * type LOOK_UP.  This causes the server to search its invitation
  48  * tables to check if an invitation currently exists for the caller
  49  * (to speak to the callee specified in the message).  If the lookup
  50  * fails, the caller then sends an ANNOUNCE message causing the server
  51  * to broadcast an announcement on the callee's login ports requesting
  52  * contact.  When the callee responds, the local server uses the
  53  * recorded invitation to respond with the appropriate rendezvous
  54  * address and the caller and callee client programs establish a
  55  * stream connection through which the conversation takes place.
  56  */
  57
  58 /*
  59  * XXX: Nothing should explicity reference the structure osockaddr.
  60  * It is for binary compatibility only.  The talk protocol doesn't
  61  * understand this yet.
  62  */
  63 struct osockaddr {
  64         u_short sa_family;
  65         char    sa_data[14];
  66 };
  67
  68 /*
  69  * Client->server request message format.
  70  */
  71 typedef struct {
  72         u_char  vers;           /* protocol version */
  73         u_char  type;           /* request type, see below */
  74         u_char  answer;         /* not used */
  75         u_char  pad;
  76         u_int32_t       id_num;         /* message id */
  77         struct  osockaddr addr;         /* old (4.3) style */
  78         struct  osockaddr ctl_addr;     /* old (4.3) style */
  79         int32_t pid;            /* caller's process id */
  80 #define NAME_SIZE       12
  81         char    l_name[NAME_SIZE];/* caller's name */
  82         char    r_name[NAME_SIZE];/* callee's name */
  83 #define TTY_SIZE        16
  84         char    r_tty[TTY_SIZE];/* callee's tty name */
  85 } CTL_MSG;
  86
  87 /*
  88  * Server->client response message format.
  89  */
  90 typedef struct {
  91         u_char  vers;           /* protocol version */
  92         u_char  type;           /* type of request message, see below */
  93         u_char  answer;         /* respose to request message, see below */
  94         u_char  pad;
  95         u_int32_t       id_num;         /* message id */
  96         struct  osockaddr addr; /* address for establishing conversation */
  97 } CTL_RESPONSE;
  98
  99 #define TALK_VERSION    1               /* protocol version */
 100
 101 /* message type values */
 102 #define LEAVE_INVITE    0       /* leave invitation with server */
 103 #define LOOK_UP         1       /* check for invitation by callee */
 104 #define DELETE          2       /* delete invitation by caller */
 105 #define ANNOUNCE        3       /* announce invitation by caller */
 106
 107 /* answer values */
 108 #define SUCCESS         0       /* operation completed properly */
 109 #define NOT_HERE        1       /* callee not logged in */
 110 #define FAILED          2       /* operation failed for unexplained reason */
 111 #define MACHINE_UNKNOWN 3       /* caller's machine name unknown */
 112 #define PERMISSION_DENIED 4     /* callee's tty doesn't permit announce */
 113 #define UNKNOWN_REQUEST 5       /* request has invalid type value */
 114 #define BADVERSION      6       /* request has invalid protocol version */
 115 #define BADADDR         7       /* request has invalid addr value */
 116 #define BADCTLADDR      8       /* request has invalid ctl_addr value */
 117
 118 /*
 119  * Operational parameters.
 120  */
 121 #define MAX_LIFE        60      /* max time daemon saves invitations */
 122 /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
 123 #define RING_WAIT       30      /* time to wait before resending invitation */
 124
 125 #endif /* !_TALKD_H_ */