/// <summary>
/// Determine if the transport layer checksum is valid
/// </summary>
/// <param name="option">
/// A <see cref="TransportChecksumOption" />
/// </param>
/// <returns>
/// A <see cref="bool" />
/// </returns>
public virtual bool IsValidChecksum(TransportChecksumOption option)
{
var dataToChecksum = ((IPPacket)ParentPacket).PayloadPacket.BytesSegment;
if (dataToChecksum.Offset + dataToChecksum.Length > dataToChecksum.BytesLength)
{
return(false);
}
var bytes = option == TransportChecksumOption.IncludePseudoIPHeader
? ((IPPacket)ParentPacket).GetPseudoIPHeader(dataToChecksum.Length)
: new byte[0];
var onesSum = ChecksumUtils.OnesSum(dataToChecksum, bytes);
Log.DebugFormat("option: {0}, byteArrayCombination.Length {1}",
option,
bytes.Length);
const int expectedOnesSum = 0xFFFF;
Log.DebugFormat("onesSum {0} expected {1}",
onesSum,
expectedOnesSum);
return(onesSum == expectedOnesSum);
}
/// <summary>
/// Calculates the transport layer checksum, either for the
/// tcp or udp packet
/// </summary>
/// <param name="option">
/// <see cref="TransportChecksumOption" />
/// </param>
/// <returns>
/// A <see cref="int" />
/// </returns>
internal int CalculateChecksum(TransportChecksumOption option)
{
// save the checksum field value so it can be restored, altering the checksum is not
// an intended side effect of this method
var originalChecksum = Checksum;
// reset the checksum field (checksum is calculated when this field is
// zeroed)
Checksum = 0;
// copy the tcp section with data
var dataToChecksum = ((IPPacket)ParentPacket).PayloadPacket.BytesSegment;
var bytes = option == TransportChecksumOption.IncludePseudoIPHeader
? ((IPPacket)ParentPacket).GetPseudoIPHeader(dataToChecksum.Length)
: new byte[0];
// calculate the one's complement sum of the tcp header
var cs = ChecksumUtils.OnesComplementSum(dataToChecksum, bytes);
// restore the checksum field value
Checksum = originalChecksum;
return(cs);
}
/// <summary>
/// Calculates the transport layer checksum, either for the
/// tcp or udp packet
/// </summary>
/// <param name="option"><see cref="TransportPacket.TransportChecksumOption"/></param>
/// <returns>
/// A <see cref="System.Int32"/>
/// </returns>
internal int CalculateChecksum(TransportChecksumOption option)
{
// save the checksum field value so it can be restored, altering the checksum is not
// an intended side effect of this method
var originalChecksum = Checksum;
// reset the checksum field (checksum is calculated when this field is
// zeroed)
Checksum = 0;
// copy the tcp section with data
byte[] dataToChecksum = ((IpPacket)ParentPacket).PayloadPacket.Bytes;
if (option == TransportChecksumOption.AttachPseudoIPHeader)
{
dataToChecksum = ((IpPacket)ParentPacket).AttachPseudoIPHeader(dataToChecksum);
}
// calculate the one's complement sum of the tcp header
int cs = ChecksumUtils.OnesComplementSum(dataToChecksum);
// restore the checksum field value
Checksum = originalChecksum;
return(cs);
}
public virtual bool IsValidChecksum(TransportChecksumOption option)
{
byte[] bytes = ((IpPacket)this.ParentPacket).PayloadPacket.Bytes;
if (option == TransportChecksumOption.AttachPseudoIPHeader)
{
bytes = ((IpPacket)this.ParentPacket).AttachPseudoIPHeader(bytes);
}
return(ChecksumUtils.OnesSum(bytes) == 0xffff);
}
internal int CalculateChecksum(TransportChecksumOption option)
{
this.Checksum = 0;
byte[] bytes = ((IpPacket)this.ParentPacket).PayloadPacket.Bytes;
if (option == TransportChecksumOption.AttachPseudoIPHeader)
{
bytes = ((IpPacket)this.ParentPacket).AttachPseudoIPHeader(bytes);
}
return(ChecksumUtils.OnesComplementSum(bytes));
}
/// <summary>
/// Determine if the transport layer checksum is valid
/// </summary>
/// <param name="option">
/// A <see cref="TransportChecksumOption"/>
/// </param>
/// <returns>
/// A <see cref="System.Boolean"/>
/// </returns>
public virtual bool IsValidChecksum(TransportChecksumOption option)
{
var upperLayer = ((IpPacket)ParentPacket).PayloadPacket.Bytes;
if (option == TransportChecksumOption.AttachPseudoIPHeader)
{
upperLayer = ((IpPacket)ParentPacket).AttachPseudoIPHeader(upperLayer);
}
var onesSum = ChecksumUtils.OnesSum(upperLayer);
const int expectedOnesSum = 0xffff;
return(onesSum == expectedOnesSum);
}
/// <summary>
/// Determine if the transport layer checksum is valid
/// </summary>
/// <param name="option">
/// A <see cref="TransportChecksumOption" />
/// </param>
/// <returns>
/// A <see cref="System.Boolean" />
/// </returns>
public virtual bool IsValidChecksum(TransportChecksumOption option)
{
var upperLayer = ((IpPacket)this.ParentPacket).PayloadPacket.Bytes;
log.DebugFormat("option: {0}, upperLayer.Length {1}", option, upperLayer.Length);
if (option == TransportChecksumOption.AttachPseudoIPHeader)
{
upperLayer = ((IpPacket)this.ParentPacket).AttachPseudoIPHeader(upperLayer);
}
var onesSum = ChecksumUtils.OnesSum(upperLayer);
const int expectedOnesSum = 0xffff;
log.DebugFormat("onesSum {0} expected {1}", onesSum, expectedOnesSum);
return(onesSum == expectedOnesSum);
}
/// <summary>
/// Determine if the transport layer checksum is valid
/// </summary>
/// <param name="option">
/// A <see cref="TransportChecksumOption"/>
/// </param>
/// <returns>
/// A <see cref="System.Boolean"/>
/// </returns>
public virtual Boolean IsValidChecksum(TransportChecksumOption option)
{
var dataToChecksum = ((IpPacket)ParentPacket).PayloadPacket.BytesHighPerformance;
var bytes = option == TransportChecksumOption.IncludePseudoIPHeader
? ((IpPacket)ParentPacket).GetPseudoIPHeader(dataToChecksum.Length)
: new byte[0];
var onesSum = ChecksumUtils.OnesSum(dataToChecksum, bytes);
log.DebugFormat("option: {0}, byteArrayCombination.Length {1}",
option, bytes.Length);
const Int32 expectedOnesSum = 0xffff;
log.DebugFormat("onesSum {0} expected {1}",
onesSum,
expectedOnesSum);
return(onesSum == expectedOnesSum);
}
