public override IDHCPOption FromStream(Stream s)
{
DHCPOptionMaximumDHCPMessageSize result = new DHCPOptionMaximumDHCPMessageSize();
if (s.Length != 2)
{
throw new IOException("Invalid DHCP option length");
}
result.m_MaxSize = ParseHelper.ReadUInt16(s);
return(result);
}
private DHCPMessage(Stream s) : this()
{
m_Opcode = (TOpcode)s.ReadByte();
m_HardwareType = (THardwareType)s.ReadByte();
m_ClientHardwareAddress = new byte[s.ReadByte()];
m_Hops = (byte)s.ReadByte();
m_XID = ParseHelper.ReadUInt32(s);
m_Secs = ParseHelper.ReadUInt16(s);
m_BroadCast = ((ParseHelper.ReadUInt16(s) & 0x8000) == 0x8000);
m_ClientIPAddress = ParseHelper.ReadIPAddress(s);
m_YourIPAddress = ParseHelper.ReadIPAddress(s);
m_NextServerIPAddress = ParseHelper.ReadIPAddress(s);
m_RelayAgentIPAddress = ParseHelper.ReadIPAddress(s);
s.Read(m_ClientHardwareAddress, 0, m_ClientHardwareAddress.Length);
for (int t = m_ClientHardwareAddress.Length; t < 16; t++)
{
s.ReadByte();
}
byte[] serverHostNameBuffer = new byte[64];
s.Read(serverHostNameBuffer, 0, serverHostNameBuffer.Length);
byte[] bootFileNameBuffer = new byte[128];
s.Read(bootFileNameBuffer, 0, bootFileNameBuffer.Length);
// read options magic cookie
if (s.ReadByte() != 99)
{
throw new IOException();
}
if (s.ReadByte() != 130)
{
throw new IOException();
}
if (s.ReadByte() != 83)
{
throw new IOException();
}
if (s.ReadByte() != 99)
{
throw new IOException();
}
byte[] optionsBuffer = new byte[s.Length - s.Position];
s.Read(optionsBuffer, 0, optionsBuffer.Length);
byte overload = ScanOverload(new MemoryStream(optionsBuffer));
switch (overload)
{
default:
m_ServerHostName = ParseHelper.ReadZString(new MemoryStream(serverHostNameBuffer));
m_BootFileName = ParseHelper.ReadZString(new MemoryStream(bootFileNameBuffer));
m_Options = ReadOptions(optionsBuffer, new byte[0], new byte[0]);
break;
case 1:
m_ServerHostName = ParseHelper.ReadZString(new MemoryStream(serverHostNameBuffer));
m_Options = ReadOptions(optionsBuffer, bootFileNameBuffer, new byte[0]);
break;
case 2:
m_BootFileName = ParseHelper.ReadZString(new MemoryStream(bootFileNameBuffer));
m_Options = ReadOptions(optionsBuffer, serverHostNameBuffer, new byte[0]);
break;
case 3:
m_Options = ReadOptions(optionsBuffer, bootFileNameBuffer, serverHostNameBuffer);
break;
}
}