handle termination message

libi2pd/NTCP2.cpp

@@ -447,7 +447,7 @@ namespace transport
 		SHA256 (h, 80, m_Establisher->m_H); 			
 
 		std::vector<uint8_t> buf(m_Establisher->m3p2Len - 16); // -MAC
-		buf[0] = 2; // block
+		buf[0] = eNTCP2BlkRouterInfo; // block
 		htobe16buf (buf.data () + 1, i2p::context.GetRouterInfo ().GetBufferLen () + 1); // flag + RI
 		buf[3] = 0; // flag 	
 		memcpy (buf.data () + 4, i2p::context.GetRouterInfo ().GetBuffer (), i2p::context.GetRouterInfo ().GetBufferLen ());
@@ -695,7 +695,13 @@ namespace transport
 					break;
 				}
 				case eNTCP2BlkTermination:
-					LogPrint (eLogDebug, "NTCP2: termination");
+					if (size >= 9)			
+					{
+						LogPrint (eLogDebug, "NTCP2: termination. reason=", (int)(frame[offset + 9]));
+						Terminate ();
+					}
+					else
+						LogPrint (eLogWarning, "NTCP2: Unexpected temination block size ", size);
 				break;
 				case eNTCP2BlkPadding:
 					LogPrint (eLogDebug, "NTCP2: padding");

libi2pd/NTCP2.h

@@ -28,6 +28,29 @@ namespace transport
 		eNTCP2BlkPadding = 254	
 	};	
 
+	enum NTCP2TerminationReason
+	{
+		eNTCP2NormalClose = 0,
+		eNTCP2TerminationReceived, // 1
+		eNTCP2IdleTimeout, // 2
+		eNTCP2RouterShutdown, // 3
+		eNTCP2DataPhaseAEADFailure, // 4
+		eNTCP2IncompatibleOptions, // 5
+		eNTCP2IncompatibleSignatureType, // 6
+		eNTCP2ClockSkew, // 7
+		eNTCP2PaddingViolation, // 8
+		eNTCP2AEADFraminError, // 9
+		eNTCP2PayloadFromatError, // 10
+		eNTCP2Message1Error, // 11
+		eNTCP2Message2Error, // 12
+		eNTCP2Message3Error, // 13
+		eNTCP2IntraFrameReadTimeout, // 14
+		eNTCP2RouterInfoSignatureVerificationFail, // 15
+		eNTCP2IncorrectSParameter, // 16
+		eNTCP2Banned, // 17
+	};		
+	
+
 	struct NTCP2Establisher
 	{
 		NTCP2Establisher ();