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Annotation of 43BSD/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.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)talkd.h     5.2 (Berkeley) 3/13/86
                      7:  */
                      8: 
                      9: #include <sys/types.h>
                     10: #include <sys/socket.h>
                     11: /*
                     12:  * This describes the protocol used by the talk server and clients.
                     13:  *
                     14:  * The talk server acts a repository of invitations, responding to
                     15:  * requests by clients wishing to rendezvous for the purpose of
                     16:  * holding a conversation.  In normal operation, a client, the caller,
                     17:  * initiates a rendezvous by sending a CTL_MSG to the server of
                     18:  * type LOOK_UP.  This causes the server to search its invitation
                     19:  * tables to check if an invitation currently exists for the caller
                     20:  * (to speak to the callee specified in the message).  If the lookup
                     21:  * fails, the caller then sends an ANNOUNCE message causing the server
                     22:  * to broadcast an announcement on the callee's login ports requesting
                     23:  * contact.  When the callee responds, the local server uses the
                     24:  * recorded invitation to respond with the appropriate rendezvous
                     25:  * address and the caller and callee client programs establish a
                     26:  * stream connection through which the conversation takes place.
                     27:  */
                     28: 
                     29: /*
                     30:  * Client->server request message format.
                     31:  */
                     32: typedef struct {
                     33:        u_char  vers;           /* protocol version */
                     34:        u_char  type;           /* request type, see below */
                     35:        u_char  answer;         /* not used */
                     36:        u_char  pad;
                     37:        u_long  id_num;         /* message id */
                     38:        struct  sockaddr addr;
                     39:        struct  sockaddr ctl_addr;
                     40:        long    pid;            /* caller's process id */
                     41: #define        NAME_SIZE       12
                     42:        char    l_name[NAME_SIZE];/* caller's name */
                     43:        char    r_name[NAME_SIZE];/* callee's name */
                     44: #define        TTY_SIZE        16
                     45:        char    r_tty[TTY_SIZE];/* callee's tty name */
                     46: } CTL_MSG;
                     47: 
                     48: /*
                     49:  * Server->client response message format.
                     50:  */
                     51: typedef struct {
                     52:        u_char  vers;           /* protocol version */
                     53:        u_char  type;           /* type of request message, see below */
                     54:        u_char  answer;         /* respose to request message, see below */
                     55:        u_char  pad;
                     56:        u_long  id_num;         /* message id */
                     57:        struct  sockaddr addr;  /* address for establishing conversation */
                     58: } CTL_RESPONSE;
                     59: 
                     60: #define        TALK_VERSION    1               /* protocol version */
                     61: 
                     62: /* message type values */
                     63: #define LEAVE_INVITE   0       /* leave invitation with server */
                     64: #define LOOK_UP                1       /* check for invitation by callee */
                     65: #define DELETE         2       /* delete invitation by caller */
                     66: #define ANNOUNCE       3       /* announce invitation by caller */
                     67: 
                     68: /* answer values */
                     69: #define SUCCESS                0       /* operation completed properly */
                     70: #define NOT_HERE       1       /* callee not logged in */
                     71: #define FAILED         2       /* operation failed for unexplained reason */
                     72: #define MACHINE_UNKNOWN        3       /* caller's machine name unknown */
                     73: #define PERMISSION_DENIED 4    /* callee's tty doesn't permit announce */
                     74: #define UNKNOWN_REQUEST        5       /* request has invalid type value */
                     75: #define        BADVERSION      6       /* request has invalid protocol version */
                     76: #define        BADADDR         7       /* request has invalid addr value */
                     77: #define        BADCTLADDR      8       /* request has invalid ctl_addr value */
                     78: 
                     79: /*
                     80:  * Operational parameters.
                     81:  */
                     82: #define MAX_LIFE       60      /* max time daemon saves invitations */
                     83: /* RING_WAIT should be 10's of seconds less than MAX_LIFE */
                     84: #define RING_WAIT      30      /* time to wait before resending invitation */

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