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Annotation of 43BSDReno/include/protocols/talkd.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  *
                     19:  *     @(#)talkd.h     5.5 (Berkeley) 6/1/90
                     20:  */
                     21: 
                     22: #include <sys/types.h>
                     23: #include <sys/socket.h>
                     24: /*
                     25:  * This describes the protocol used by the talk server and clients.
                     26:  *
                     27:  * The talk server acts a repository of invitations, responding to
                     28:  * requests by clients wishing to rendezvous for the purpose of
                     29:  * holding a conversation.  In normal operation, a client, the caller,
                     30:  * initiates a rendezvous by sending a CTL_MSG to the server of
                     31:  * type LOOK_UP.  This causes the server to search its invitation
                     32:  * tables to check if an invitation currently exists for the caller
                     33:  * (to speak to the callee specified in the message).  If the lookup
                     34:  * fails, the caller then sends an ANNOUNCE message causing the server
                     35:  * to broadcast an announcement on the callee's login ports requesting
                     36:  * contact.  When the callee responds, the local server uses the
                     37:  * recorded invitation to respond with the appropriate rendezvous
                     38:  * address and the caller and callee client programs establish a
                     39:  * stream connection through which the conversation takes place.
                     40:  */
                     41: 
                     42: /*
                     43:  * Client->server request message format.
                     44:  */
                     45: typedef struct {
                     46:        u_char  vers;           /* protocol version */
                     47:        u_char  type;           /* request type, see below */
                     48:        u_char  answer;         /* not used */
                     49:        u_char  pad;
                     50:        u_long  id_num;         /* message id */
                     51:        struct  osockaddr addr;         /* old (4.3) style */
                     52:        struct  osockaddr ctl_addr;     /* old (4.3) style */
                     53:        long    pid;            /* caller's process id */
                     54: #define        NAME_SIZE       12
                     55:        char    l_name[NAME_SIZE];/* caller's name */
                     56:        char    r_name[NAME_SIZE];/* callee's name */
                     57: #define        TTY_SIZE        16
                     58:        char    r_tty[TTY_SIZE];/* callee's tty name */
                     59: } CTL_MSG;
                     60: 
                     61: /*
                     62:  * Server->client response message format.
                     63:  */
                     64: typedef struct {
                     65:        u_char  vers;           /* protocol version */
                     66:        u_char  type;           /* type of request message, see below */
                     67:        u_char  answer;         /* respose to request message, see below */
                     68:        u_char  pad;
                     69:        u_long  id_num;         /* message id */
                     70:        struct  osockaddr addr; /* address for establishing conversation */
                     71: } CTL_RESPONSE;
                     72: 
                     73: #define        TALK_VERSION    1               /* protocol version */
                     74: 
                     75: /* message type values */
                     76: #define LEAVE_INVITE   0       /* leave invitation with server */
                     77: #define LOOK_UP                1       /* check for invitation by callee */
                     78: #define DELETE         2       /* delete invitation by caller */
                     79: #define ANNOUNCE       3       /* announce invitation by caller */
                     80: 
                     81: /* answer values */
                     82: #define SUCCESS                0       /* operation completed properly */
                     83: #define NOT_HERE       1       /* callee not logged in */
                     84: #define FAILED         2       /* operation failed for unexplained reason */
                     85: #define MACHINE_UNKNOWN        3       /* caller's machine name unknown */
                     86: #define PERMISSION_DENIED 4    /* callee's tty doesn't permit announce */
                     87: #define UNKNOWN_REQUEST        5       /* request has invalid type value */
                     88: #define        BADVERSION      6       /* request has invalid protocol version */
                     89: #define        BADADDR         7       /* request has invalid addr value */
                     90: #define        BADCTLADDR      8       /* request has invalid ctl_addr value */
                     91: 
                     92: /*
                     93:  * Operational parameters.
                     94:  */
                     95: #define MAX_LIFE       60      /* max time daemon saves invitations */
                     96: /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
                     97: #define RING_WAIT      30      /* time to wait before resending invitation */

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