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/*
File: MPHelperNotificationsProtocol.h
Contains: Definition of the communication protocol between client and server.
Written by: DTS
Copyright: Copyright (c) 2005 by Apple Computer, Inc., All Rights Reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following terms, and your
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or implied,
are granted by Apple herein, including but not limited to any patent rights that
may be infringed by your derivative works or by other works in which the Apple
Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE MAKES NO
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Change History (most recent first):
$Log: MPHelperNotificationsProtocol.h,v $
Revision 1.1 2005/05/17 12:19:23
First checked in.
*/
#ifndef _PROTOCOL_H
#define _PROTOCOL_H
/////////////////////////////////////////////////////////////////
// System interfaces
#include <CoreServices/CoreServices.h>
#include <inttypes.h>
/////////////////////////////////////////////////////////////////
// Packet types
enum {
kPacketTypeGoodbye = 'GDBY', // sent by client to server before signing off
kPacketTypeNOP = 'NOOP', // no operation, test for client/server RPC
kPacketTypeReply = 'RPLY', // all RPC replies are of this type
kPacketTypeWhisper = 'WSPR', // client/server RPC to print message on server
kPacketTypeShout = 'SHOU', // sent by client to server, which echoes it to all listening clients
kPacketTypeListen = 'LSTN', // client/server RPC to register for shouts
kPacketTypeQuit = 'QUIT' // client/server RPC to tell server to quit
};
// Well known packet IDs (for the fID field of the packet header).
// kPacketIDFirst is just a suggestion. The server doesn't require
// that the client use sequential IDs starting from 1; the IDs are
// for the client to choose. However, the use of kPacketIDNone for
// some packets (those that don't have a reply) is a hard requirement
// in the server.
enum {
kPacketIDNone = 0,
kPacketIDFirst = 1
};
// kPacketMagic is first four bytes of every packet. If the packet stream
// gets out of sync, this will quickly detect the problem.
enum {
kPacketMagic = 'LSPM' // for Local Server Packet Magic
};
// kPacketMaximumSize is an arbitrary limit, chosen so that we can detect
// if the packet streams get out of sync or if a client goes mad.
enum {
kPacketMaximumSize = 100 * 1024 // just basic sanity checks
};
// IMPORTANT:
// The following structures define the packets sent between the client and
// the server. For a network protocol you'd need to worry about byte ordering,
// but this isn't a network protocol (it always stays on the same machine) so
// I don't have to worry. However, I do need to worry about having
// size invariant types (so that 32- and 64-bit clients and servers are
// all compatible) and structure alignment (so that code compiled by different
// compilers is compatible). Size invariant types is easy, and represented
// by the structures below. Alignment is trickier, and I'm mostly just
// glossing over the issue right now.
// PacketHeader is the header at the front of every packet.
struct PacketHeader {
OSType fMagic; // must be kPacketMagic
OSType fType; // kPacketTypeGoodbye etc
int32_t fID; // kPacketIDNone or some other value
uint32_t fSize; // includes size of header itself
};
typedef struct PacketHeader PacketHeader;
struct PacketGoodbye { // reply: n/a
PacketHeader fHeader; // fType is kPacketTypeGoodbye, fID must be kPacketIDNone
char fMessage[32]; // Just for fun.
};
typedef struct PacketGoodbye PacketGoodbye;
struct PacketNOP { // reply: PacketReply
PacketHeader fHeader; // fType is kPacketTypeNOP, fID echoed
};
typedef struct PacketNOP PacketNOP;
struct PacketReply { // reply: n/a
PacketHeader fHeader; // fType is kPacketTypeReply, fID is ID of request
int32_t fErr; // result of operation, errno-style
};
typedef struct PacketReply PacketReply;
struct PacketWhisper { // reply: PacketReply
PacketHeader fHeader; // fType is kPacketTypeWhisper, fID echoed
char fMessage[32]; // message to print
};
typedef struct PacketWhisper PacketWhisper;
struct PacketShout { // reply: none
PacketHeader fHeader; // fType is kPacketTypeShout, fID must be kPacketIDNone
char fMessage[500]; // message for each of the clients
};
typedef struct PacketShout PacketShout;
// Shouts are echoed to anyone who listens, including sender.
struct PacketListen { // reply: PacketReply
PacketHeader fHeader; // fType is kPacketTypeListen, fID echoed
};
typedef struct PacketListen PacketListen;
struct PacketQuit { // reply: PacketReply
PacketHeader fHeader; // fType is kPacketTypeQuit, fID echoed
};
typedef struct PacketQuit PacketQuit;
// IMPORTANT:
// The location of the kServerAddress socket file is intimately tied to the
// security of the server. The file should be placed in a directory that's
// read access to everyone who needs access to the service, but only write
// accessible to the UID that's running the server. Failure to follow this
// guideline may make your server subject to security exploits.
//
// To prevent this sort of silliness I require that the socket be created
// in a directory owned by the server's user ("com.apple.dts.CFLocalServer")
// within a directory that's sticky ("/var/tmp", not "/tmp" because that's
// periodically cleaned up). See SafeBindUnixDomainSocket (in "Server.c") for
// the details about how I achieve this.
#define kServerSocketPath "/var/tmp/macports/org.macports.framework.ipc.socket"
#define MPSEPARATOR @"_&MP&_"
#endif
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