184 lines
4.4 KiB
Groff
184 lines
4.4 KiB
Groff
.\" $NetBSD: atalk.4,v 1.17 2004/05/11 22:42:47 wiz Exp $
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.\"
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.\" This file is derived from the atalk.4 man page in the Netatalk 1.4b2
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.\" distribution. That distribution is covered by the following copyright:
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.\"
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.\" Copyright (c) 1990,1996 Regents of The University of Michigan.
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.\" All Rights Reserved.
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.\"
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.\" Permission to use, copy, modify, and distribute this software and
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.\" its documentation for any purpose and without fee is hereby granted,
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.\" provided that the above copyright notice appears in all copies and
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.\" that both that copyright notice and this permission notice appear
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.\" in supporting documentation, and that the name of The University
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.\" of Michigan not be used in advertising or publicity pertaining to
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.\" distribution of the software without specific, written prior
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.\" permission. This software is supplied as is without expressed or
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.\" implied warranties of any kind.
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.\"
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\"
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.\" Research Systems Unix Group
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.\" The University of Michigan
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.\" c/o Wesley Craig
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.\" 535 W. William Street
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.\" Ann Arbor, Michigan
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.\" +1-313-764-2278
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.\" netatalk@umich.edu
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.\"
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.Dd November 14, 1997
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.Dt ATALK 4
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.Os
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.Sh NAME
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.Nm atalk
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.Nd AppleTalk Protocol Family
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.Sh SYNOPSIS
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.In sys/types.h
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.In netatalk/at.h
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.Sh DESCRIPTION
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The
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.Tn AppleTalk
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Protocol Family provides presentation layer support for the AppleTalk
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Datagram Delivery Protocol (DDP), using the SOCK_DGRAM socket type.
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In addition, access to in-kernel AppleTalk routing tables and network
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interface configurations is provided.
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.Pp
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The AppleTalk Protocol Suite provides support for five kinds of
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physical media: LocalTalk (230kbps wire-or'd serial), Ethernet,
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FDDI, Token Ring, and asynchronous serial connections (using either
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AppleTalk Remote Access
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.Pq Tn ARA
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or
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.Tn PPP
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).
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Currently,
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.Nx Ns 's
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AppleTalk implementation supports Ethernet, FDDI, and Token Ring.
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.Pp
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AppleTalk packets are encapsulated on the Ethernet using the EtherTalk
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Link Access Protocol (ELAP).
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Local network address resolution is
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handled using the AppleTalk Address Resolution Protocol (AARP).
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Neither of these protocols is exposed to user-mode applications.
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.Sh ADDRESSING
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AppleTalk addresses are three byte quantities, stored in network
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byte order.
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The include file
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.Aq Pa netatalk/at.h
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defines the AppleTalk address format.
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.Pp
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Sockets in the AppleTalk protocol family use the following address
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structure:
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.Bd -literal -offset indent
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struct sockaddr_at {
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u_int8_t sat_len;
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sa_family_t sat_family;
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u_int8_t sat_port;
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struct at_addr sat_addr;
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union {
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struct netrange r_netrange;
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char r_zero[8];
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} sat_range;
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};
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.Ed
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.Pp
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The port of a socket may be set with
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.Xr bind 2 .
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The node for
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.Xr bind 2
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must always be
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.Dv ATADDR_ANYNODE :
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.Dq this node .
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The net
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.\"may
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must
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be
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.Dv ATADDR_ANYNET .
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.\"or
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.\".Dv ATADDR_LATENET .
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.Dv ATADDR_ANYNET
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corresponds to the machine's
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.Dq primary
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address (the first configured).
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.\".Dv ATADDR_LATENET
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.\"causes the address in outgoing packets to be determined when a packet
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.\"is sent, i.e. determined late.
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.\".Dv ATADDR_LATENET
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.\"is equivalent to opening one socket for each network interface.
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The port of a socket and
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.\"either
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the primary address
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.\"or
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.\".Dv ATADDR_LATENET
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are returned with
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.Xr getsockname 2 .
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.Sh PROTOCOLS
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The AppleTalk protocol family comprises the
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.Tn DDP
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datagram delivery protocol,
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AppleTalk Data Stream Protocol
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.Pq Tn ADSP ,
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AppleTalk Echo Protocol
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.Pq Tn AEP ,
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AppleTalk Filing Protocol
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.Pq Tn AFP ,
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AppleTalk Session Protocol
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.Pq Tn ASP ,
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AppleTalk Transaction Protocol
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.Pq Tn ATP ,
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Name Binding Protocol
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.Pq Tn NBP ,
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Printer Access Protocol
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.Pq Tn PAP ,
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and Zone Information Protocol
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.Pq Tn ZIP .
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.Pp
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.Tn DDP
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is implemented in the kernel as
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.Dv SOCK_DGRAM
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sockets in the
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.Dv AF_APPLETALK
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address family.
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.Nx
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implements all other
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.Tn AppleTalk
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protocols using the
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.Tn Netatalk
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package.
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.Tn Netatalk
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implements all functions except for
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.Tn ADSP
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and an
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.Tn AFP
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client.
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.Tn AEP ,
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.Tn NBP ,
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and
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.Tn ZIP
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services are provided by the
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.Tn atalkd
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daemon.
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.Tn ASP
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and
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.Tn ATP
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services are provided by a user library.
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.Tn PAP
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and
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.Tn AFP
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services are provided by user programs and daemons.
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.Sh SEE ALSO
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.\" .BR ddp (4P),
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.\" .BR atp (3N),
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.\" .BR asp (3N),
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.Xr bind 2 ,
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.Xr getsockname 2 ,
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.Xr options 4
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.\" .Xr atalkd 8
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.Rs
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.%B Inside AppleTalk, second edition
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.%A Gursharan S. Sidhu
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.%A Richard F. Andrews
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.%A Alan B. Oppenheimer
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.Re
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