public PcapFile(string filename)
{
byte[] initData;
this.filename = filename;
content = new MemoryStream();
if (File.Exists(this.filename))
{
initData = File.ReadAllBytes(filename);
content.Write(initData, 0, initData.Length);
}
else
{
/* pcap file header */
PcapHeader fileHeader;
fileHeader = new PcapHeader(1);
initData = fileHeader.GetBytes();
content.Write(initData, 0, initData.Length);
Save();
}
}
static void Main(string[] args)
{
PcapHeader fileHeader;
PcapItemHeader packetHeader;
Ethernet packetEthernet;
IPv4 packetIP;
UDP packetUDP;
UInt16 destPort;
byte[] payloadFileHeader, payloadItemHeader, payloadEthernet, payloadIP, payloadUDP, payloadData;
DateTime captureTime;
byte[] payload;
int index;
string source, dest;
if (args.Length < 2)
{
usage();
return;
}
if (args.Length > 2)
{
if (!UInt16.TryParse(args[2], out destPort))
{
Console.WriteLine(String.Format("Error: The value {0} is not a valid port number!", args[2]));
usage();
return;
}
}
else
{
destPort = 0;
}
source = args[0];
dest = args[1];
if (!File.Exists(source))
{
Console.WriteLine(String.Format("Error: File {0} does not exists!", source));
}
if (File.Exists(dest))
{
Console.WriteLine(String.Format("Error: File {0} already exists! Please delete it first.", dest));
}
try
{
/* load payload */
payloadData = File.ReadAllBytes(source);
captureTime = File.GetLastWriteTimeUtc(source);
/* UDP */
packetUDP = new UDP(destPort, (UInt16)payloadData.Length);
payloadUDP = packetUDP.GetBytes();
/* ipv4 */
packetIP = new IPv4((UInt16)(payloadUDP.Length + payloadData.Length));
payloadIP = packetIP.GetBytes();
/* ethernet */
packetEthernet = new Ethernet(1);
payloadEthernet = packetEthernet.GetBytes();
/* pcap packet header */
packetHeader = new PcapItemHeader(captureTime, (UInt32)(payloadEthernet.Length + payloadIP.Length + payloadUDP.Length + payloadData.Length));
payloadItemHeader = packetHeader.GetBytes();
/* pcap file header */
fileHeader = new PcapHeader(1);
payloadFileHeader = fileHeader.GetBytes();
payload = new byte[payloadFileHeader.Length + payloadItemHeader.Length + payloadEthernet.Length + payloadIP.Length + payloadUDP.Length + payloadData.Length];
index = 0;
payloadFileHeader.CopyTo(payload, index);
index += payloadFileHeader.Length;
payloadItemHeader.CopyTo(payload, index);
index += payloadItemHeader.Length;
payloadEthernet.CopyTo(payload, index);
index += payloadEthernet.Length;
payloadIP.CopyTo(payload, index);
index += payloadIP.Length;
payloadUDP.CopyTo(payload, index);
index += payloadUDP.Length;
payloadData.CopyTo(payload, index);
index += payloadData.Length;
File.WriteAllBytes(dest, payload);
}
catch (Exception e)
{
Console.WriteLine(String.Format("Error: Unable to convert '{0}' to '{1}'!", source, dest));
Console.WriteLine(e.ToString());
return;
}
Console.WriteLine(String.Format("'{0}' -> '{1}'", source, dest));
}
