public static void NameResolutionOption_ConvertToByte_Test(bool reorder)
{
NameResolutionOption preOption = new NameResolutionOption();
NameResolutionOption postOption;
preOption.Comment = "Test Comment";
preOption.DnsName = "Dns Name";
preOption.DnsIp4Addr = new IPAddress(new byte[] { 127, 0, 0, 1 });
preOption.DnsIp6Addr = new IPAddress(new byte[] { 0x20, 0x01, 0x0d, 0x0db, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x14, 0x28, 0x57, 0xab });
byte[] preOptionByte = preOption.ConvertToByte(reorder, null);
using (MemoryStream stream = new MemoryStream(preOptionByte))
{
using (BinaryReader binaryReader = new BinaryReader(stream))
{
postOption = NameResolutionOption.Parse(binaryReader, reorder, null);
}
}
Assert.IsNotNull(postOption);
Assert.AreEqual(preOption.Comment, postOption.Comment);
Assert.AreEqual(preOption.DnsName, postOption.DnsName);
Assert.AreEqual(preOption.DnsIp4Addr, postOption.DnsIp4Addr);
Assert.AreEqual(preOption.DnsIp6Addr, postOption.DnsIp6Addr);
}
public static void NameResolutionOption_ConvertToByte_Test(bool reorder)
{
NameResolutionOption preOption = new NameResolutionOption();
NameResolutionOption postOption;
preOption.Comment = "Test Comment";
preOption.DnsName = "Dns Name";
preOption.DnsIp4Addr = new IPAddress(new byte[] { 127, 0, 0, 1 });
preOption.DnsIp6Addr = new IPAddress(new byte[] { 0x20, 0x01, 0x0d, 0x0db, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x14, 0x28, 0x57, 0xab });
byte[] preOptionByte = preOption.ConvertToByte(reorder, null);
using (MemoryStream stream = new MemoryStream(preOptionByte))
{
using (BinaryReader binaryReader = new BinaryReader(stream))
{
postOption = NameResolutionOption.Parse(binaryReader, reorder, null);
}
}
Assert.IsNotNull(postOption);
Assert.AreEqual(preOption.Comment, postOption.Comment);
Assert.AreEqual(preOption.DnsName, postOption.DnsName);
Assert.AreEqual(preOption.DnsIp4Addr, postOption.DnsIp4Addr);
Assert.AreEqual(preOption.DnsIp6Addr, postOption.DnsIp6Addr);
}
public static NameResolutionOption Parse(BinaryReader binaryReader, bool reverseByteOrder, Action<Exception> ActionOnException)
{
Contract.Requires<ArgumentNullException>(binaryReader != null, "binaryReader cannot be null");
NameResolutionOption option = new NameResolutionOption();
List<KeyValuePair<ushort, byte[]>> optionsList = EkstractOptions(binaryReader, reverseByteOrder, ActionOnException);
if (optionsList.Any())
{
foreach (var item in optionsList)
{
try
{
switch (item.Key)
{
case (ushort)NameResolutionOptionCode.CommentCode:
option.Comment = UTF8Encoding.UTF8.GetString(item.Value);
break;
case (ushort)NameResolutionOptionCode.DnsNameCode:
option.DnsName = UTF8Encoding.UTF8.GetString(item.Value);
break;
case (ushort)NameResolutionOptionCode.DnsIp4AddrCode:
if (item.Value.Length == 4)
option.DnsIp4Addr = new IPAddress(item.Value);
else
throw new ArgumentException(string.Format("[NameResolutionOption.Parse] DnsIp4AddrCode contains invalid length. Received: {0} bytes, expected: {1}", item.Value.Length, 4));
break;
case (ushort)NameResolutionOptionCode.DnsIp6AddrCode:
if (item.Value.Length == 16)
option.DnsIp6Addr = new IPAddress(item.Value);
else
throw new ArgumentException(string.Format("[NameResolutionOption.Parse] DnsIp6AddrCode contains invalid length. Received: {0} bytes, expected: {1}", item.Value.Length, 16));
break;
case (ushort)NameResolutionOptionCode.EndOfOptionsCode:
default:
break;
}
}
catch (Exception exc)
{
if (ActionOnException != null)
ActionOnException(exc);
}
}
}
return option;
}
public static NameResolutionOption Parse(BinaryReader binaryReader, bool reverseByteOrder, Action <Exception> ActionOnException)
{
//Contract.Requires<ArgumentNullException>(binaryReader != null, "binaryReader cannot be null");
NameResolutionOption option = new NameResolutionOption();
List <KeyValuePair <ushort, byte[]> > optionsList = EkstractOptions(binaryReader, reverseByteOrder, ActionOnException);
if (optionsList.Any())
{
foreach (var item in optionsList)
{
try
{
switch (item.Key)
{
case (ushort)NameResolutionOptionCode.CommentCode:
option.Comment = UTF8Encoding.UTF8.GetString(item.Value);
break;
case (ushort)NameResolutionOptionCode.DnsNameCode:
option.DnsName = UTF8Encoding.UTF8.GetString(item.Value);
break;
case (ushort)NameResolutionOptionCode.DnsIp4AddrCode:
if (item.Value.Length == 4)
{
option.DnsIp4Addr = new IPAddress(item.Value);
}
else
{
throw new ArgumentException(string.Format("[NameResolutionOption.Parse] DnsIp4AddrCode contains invalid length. Received: {0} bytes, expected: {1}", item.Value.Length, 4));
}
break;
case (ushort)NameResolutionOptionCode.DnsIp6AddrCode:
if (item.Value.Length == 16)
{
option.DnsIp6Addr = new IPAddress(item.Value);
}
else
{
throw new ArgumentException(string.Format("[NameResolutionOption.Parse] DnsIp6AddrCode contains invalid length. Received: {0} bytes, expected: {1}", item.Value.Length, 16));
}
break;
case (ushort)NameResolutionOptionCode.EndOfOptionsCode:
default:
break;
}
}
catch (Exception exc)
{
if (ActionOnException != null)
{
ActionOnException(exc);
}
}
}
}
return(option);
}
/// <summary>
/// The Name Resolution Block is used to support the correlation of numeric addresses (present in the captured packets) and their
/// corresponding canonical names and it is optional. Having the literal names saved in the file, this prevents the need of a name
/// resolution in a delayed time, when the association between names and addresses can be different from the one in use at capture time.
/// Moreover, the Name Resolution Block avoids the need of issuing a lot of DNS requests every time the trace capture is opened,
/// and allows to have name resolution also when reading the capture with a machine not connected to the network.
/// A Name Resolution Block is normally placed at the beginning of the file, but no assumptions can be taken about its position.
/// Name Resolution Blocks can be added in a second time by tools that process the file, like network analyzers.
/// </summary>
public NameResolutionBlock(NameResolutionRecord nameResolutionRecords, NameResolutionOption Options, long PositionInStream = 0)
{
Contract.Requires<ArgumentNullException>(Options != null, "Options cannot be null");
Contract.Requires<ArgumentNullException>(nameResolutionRecords != null, "NameResolutionRecords cannot be null");
this.NameResolutionRecords = nameResolutionRecords;
this.options = Options;
this.PositionInStream = PositionInStream;
}
