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/*
Copyright (c) 2015-2015 Cisco Systems, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "TCPOptions.h"
#include "IPHeader.h"
bool TCPOptions::ourOneShotDump = false;
TCPOptions::Counters TCPOptions::ourCounters = {0,0,0};
TCPOptions::TCPOptions(uint8_t* argOptionsP, uint16_t argOptionsSize):
myOptionsP (argOptionsP),
myOptionsSize (argOptionsSize),
myCurrentOptionP((Option*)argOptionsP)
{
;
}
bool TCPOptions::doesContain(TCPOptions::Kind::Val argKind)
{
uint32_t optionTypeIdx = 0;// Used to verify that we're not in infinite loop
// we'll run over the whole list of TLVs and check each relative to the time stamp
// option kind value.
do
{
Kind::Val theCurrentOptionKind;
uint8_t theOptionLength;
getCurrentOption(theCurrentOptionKind, theOptionLength);
optionTypeIdx++;
if( theCurrentOptionKind == argKind )
{
return true;
}
} while( (nextOption() == true) && (optionTypeIdx < MaxOptionsInPacket));
if(optionTypeIdx >= MaxOptionsInPacket)
{
ourCounters.itsPossibleEndlessLoop++;
}
// none of the TLV was of type TimeStamp
return false;
}
//--------------------------------------------------------------------------------------------------
// Set methods
//--------------------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------------------------
// Miscellaneous Operations
//--------------------------------------------------------------------------------------------------
void TCPOptions::dump(FILE* argOutputFile)
{
fprintf(argOutputFile, "\nNot supported yet!\n");
}
void TCPOptions::get(TCPOptions::Counters& argCounters)
{
argCounters.itsOptionsSizeMismatch = ourCounters.itsOptionsSizeMismatch;
argCounters.itsZeroLengthOptions = ourCounters.itsZeroLengthOptions;
argCounters.itsPossibleEndlessLoop = ourCounters.itsPossibleEndlessLoop;
}
uint8_t* TCPOptions::getCurrentOption (Kind::Val& argKind, uint8_t& argLength)
{
argKind = (Kind::Val)myCurrentOptionP->theKind;
argLength = getCurrentOptionLength();
return(uint8_t*)myCurrentOptionP;
}
uint8_t TCPOptions::getCurrentOptionLength()
{
if(myCurrentOptionP->theKind == Kind::NO_OP ||
myCurrentOptionP->theKind == Kind::EOL)
{
return 1;
}
else
{
return myCurrentOptionP->theLength;
}
}
// This is a patch for temporary packet dump facility
//
#define MAX_BUFFER_SIZE (8 * 2048)
static char theDumpBuffer[MAX_BUFFER_SIZE] ={0};
bool TCPOptions::isLastOption ()
{
// Below is the total length of the options we've passed so far
uint32_t theCurrentOffset = (uint32_t)((uintptr_t)((char *)myCurrentOptionP - (char *)myOptionsP));
uint32_t theCurrentLength = getCurrentOptionLength();
if( (theCurrentOffset + theCurrentLength) >= myOptionsSize )
{
// debug check
if( (theCurrentOffset + theCurrentLength) > myOptionsSize )
{
ourCounters.itsOptionsSizeMismatch++;
if(ourOneShotDump == false)
{
ourOneShotDump = true;//disable for next time
uint8_t* theIPPacket = (uint8_t*)((uintptr_t)(myOptionsP - 40));
IPHeader* theIPHeader = (IPHeader*)theIPPacket;
uint16_t thePacketLength = theIPHeader->getTotalLength();
if(thePacketLength < (MAX_BUFFER_SIZE / 8))
{
int numWritten = sprintf(theDumpBuffer, "\nDump Size %u\n", thePacketLength);
for (uint32_t i = 0; i < thePacketLength; i++)
{
numWritten += sprintf(theDumpBuffer + numWritten,"%.2x ", theIPPacket[i]);
if ((i % 16) == 15)
{
numWritten += sprintf(theDumpBuffer + numWritten,"\n");
}
}
}
}
}
return true;
}
else
{
return false;
}
}
//--------------------------------------------------------------------------------------------------
// Set methods
//--------------------------------------------------------------------------------------------------
bool TCPOptions::nextOption ()
{
if( isLastOption() == true )
{
return false;
}
else
{
uint32_t theCurrentOptionLength = getCurrentOptionLength();
if(theCurrentOptionLength > 0)
{
uint8_t* theCurrentP = (uint8_t*)myCurrentOptionP;
theCurrentP += theCurrentOptionLength;
myCurrentOptionP = (Option*)theCurrentP;
return true;
}
else
{
ourCounters.itsZeroLengthOptions++;
return false;
}
}
}
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