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108 lines
2.9 KiB
108 lines
2.9 KiB
/*
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Network Interface
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Generic wrapper around a specific network device.
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A Network Interface (representing the physical network device) returns a
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connecting or listening Network Connection (representing a socket in either
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client or server state).
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Author:
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Philip Lindsay <follower@rancidbacon.com>
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License:
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Copyright 2007-2008 // LGPL
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*/
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#include "interface.h"
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#define HANDLE_BAD_ERROR() while (1) {};
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NetworkInterface::NetworkInterface(W5100Device& networkDevice) : device (networkDevice) {
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/*
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Initialise the physical device with default network details.
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Note: The "weirdness" in this function declaration is a "initalization list",
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i.e. this bit:
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) : device (networkDevice) {
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it is needed to give the 'device' Reference a value supplied to the method
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rather than having a new 'W5100Device' instance created.
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*/
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// This may not be the best place to do all this, but it'll do for now:
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device.setMac(0x02,0xDE,0xAD,0xBE,0xEF,0x00);
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device.setIp(169,254,254,169); // A local-link IP -- NOTE: This is out of spec.
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device.setMask(255,255,0,0); // Matches local-link IP /16
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device.setGateway(0,0,0,0); // We can't even guess this, so just skip it.
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};
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NetworkConnection NetworkInterface::listen(uint16_t port) {
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/*
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Start to listen for a request from a client.
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NOTE: For reasons I don't understand, this FAILS TO WORK if port >255.
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The port that gets opened is ~(port mod 255) but if you limit
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port to be uint8_t for example you don't get an error until
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the port number is bigger than 'long'.
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TODO: Track and fix this for port numbers > 255.
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Returns a NetworkConnection listening on the specified TCP port.
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*/
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NetworkConnection connection = NetworkConnection(port);
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// TODO: How to best handle errors?
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// There's two major categories I can think of currently:
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// 1) A socket wasn't available to listen in the first place
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// 2) The listen attempt failed for some reason
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// Using 'HANDLE_BAD_ERROR()' (currently an infinite loop) is
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// not ideal but should prevent the above errors slipping by unnoticed.
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if (!connection.listen()) {
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HANDLE_BAD_ERROR();
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}
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return connection;
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}
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NetworkConnection NetworkInterface::connect(byte b0, byte b1, byte b2, byte b3, uint16 port) {
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/*
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Connect to a server.
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*/
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NetworkConnection connection = NetworkConnection(4000);
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byte _scratchBuffer[4]; // TODO: Move this?
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// TODO: Better?
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_scratchBuffer[0] = b0;
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_scratchBuffer[1] = b1;
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_scratchBuffer[2] = b2;
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_scratchBuffer[3] = b3;
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if (!connection.connect(_scratchBuffer, port)) {
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HANDLE_BAD_ERROR();
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}
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return connection;
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}
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//#include "w5100_device.h"
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//NetworkInterface Network = NetworkInterface(W5100);
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