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90 lines
2.0 KiB
90 lines
2.0 KiB
/*++
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Copyright (c) 1989 Microsoft Corporation
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Module Name:
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ep.c
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Abstract:
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Echo protocol handling
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Author:
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Garth Conboy (Pacer Software)
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Nikhil Kamkolkar (NikhilK)
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Revision History:
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--*/
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#define IncludeEpErrors 1
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#include "atalk.h"
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long far EpPacketIn(AppleTalkErrorCode errorCode,
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long unsigned userData,
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int port,
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AppleTalkAddress source,
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long destinationSocket,
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int protocolType,
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char far *datagram,
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int datagramLength,
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AppleTalkAddress actualDestination)
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{
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BufferDescriptor descriptor;
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// "Use" unneeded actual parameters.
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userData, actualDestination, port;
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// Only play if we've been asked nicely!
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if (errorCode is ATsocketClosed)
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return;
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else if (errorCode isnt ATnoError) {
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ErrorLog("EpPacketIn", ISevError, __LINE__, port,
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IErrEpBadIncomingError, IMsgEpBadIncomingError,
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Insert0());
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return((long)True);
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}
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// Only listen to EP type packets that have some data.
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if (protocolType isnt DdpProtocolEp or
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datagramLength is 0)
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return((long)True);
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// Do we have an Echo reqeust?
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if (datagram[EpCommandOffset] isnt EchoRequest)
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return;
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//
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// Allocate a buffer descriptor for the reply... make a copy due to the
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// possibility of asynchronous transmit completion.
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//
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if ((descriptor = NewBufferDescriptor(datagramLength)) is Empty) {
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ErrorLog("EpPacketIn", ISevError, __LINE__, port,
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IErrEpOutOfMemory, IMsgEpOutOfMemory,
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Insert0());
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return((long)True);
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}
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MoveMem(descriptor->data, datagram, datagramLength);
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// Okay, turn the packet around.
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descriptor->data[EpCommandOffset] = EchoReply;
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if (DeliverDdp(destinationSocket, source, protocolType, descriptor,
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datagramLength, Empty, Empty, 0) isnt ATnoError)
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ErrorLog("EpPacketIn", ISevError, __LINE__, port,
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IErrEpBadReplySend, IMsgEpBadReplySend,
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Insert0());
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return((long)True);
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} // EpPacketIn
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