/** * <summary>Creates a response given the entire packet.</summary> * <remarks>The entire packet must be given, because some name servers take * advantage of pointers to reduce their size.</remarks> * <param name="Data">The entire Dns packet.</param> * <param name="Start">The starting position of the Response.</param> */ public Response(MemBlock Data, int Start) { int idx = 0; NameBlob = DnsPacket.RetrieveBlob(Data, Start, out idx); int type = (Data[idx++] << 8) + Data[idx++]; Type = (DnsPacket.Types)type; CacheFlush = ((Data[idx] & 0x80) == 0x80) ? true : false; int rclass = ((Data[idx++] << 8) & 0x7F) + Data[idx++]; Class = (DnsPacket.Classes)rclass; Ttl = (Data[idx++] << 24); Ttl |= (Data[idx++] << 16); Ttl |= (Data[idx++] << 8); Ttl |= (Data[idx++]); RdLength = (short)((Data[idx++] << 8) + Data[idx++]); RDataBlob = Data.Slice(idx, RdLength); if (Type == DnsPacket.Types.Ptr) { try { Name = DnsPacket.PtrMemBlockToString(NameBlob); } catch { Name = DnsPacket.HostnameMemBlockToString(NameBlob); } int End = 0; RDataBlob = DnsPacket.RetrieveBlob(Data, idx, out End); RData = DnsPacket.HostnameMemBlockToString(RDataBlob); } else if (Type == DnsPacket.Types.A) { Name = DnsPacket.HostnameMemBlockToString(NameBlob); RData = DnsPacket.IPMemBlockToString(RDataBlob); } _icpacket = _packet = Data.Slice(Start, idx + RdLength - Start); }
public void TestIP() { String ip = "208.80.152.3"; MemBlock ipm = MemBlock.Reference(new byte[] { 0xd0, 0x50, 0x98, 0x03 }); Assert.AreEqual(ip, DnsPacket.IPMemBlockToString(ipm), "IPMemBlockToString"); Assert.AreEqual(ipm, DnsPacket.IPStringToMemBlock(ip), "IPStringToMemBlock"); Assert.AreEqual(ip, DnsPacket.IPMemBlockToString( DnsPacket.IPStringToMemBlock(ip)), "IP String dual"); Assert.AreEqual(ipm, DnsPacket.IPStringToMemBlock( DnsPacket.IPMemBlockToString(ipm)), "IP MemBlock dual"); String bad_ip = "Test.Test.Test.123"; MemBlock bad_ipm = null; try { bad_ipm = DnsPacket.IPStringToMemBlock(bad_ip); } catch {} Assert.AreEqual(null, bad_ipm, "Bad IP"); }