I2NP protocol added

I2NPProtocol.h

@@ -0,0 +1,127 @@
+#ifndef I2NP_PROTOCOL_H__
+#define I2NP_PROTOCOL_H__
+
+#include <inttypes.h>
+#include <vector>
+#include "RouterInfo.h"
+
+namespace i2p
+{
+#pragma pack (1)
+
+	struct I2NPHeader
+	{
+		uint8_t typeID;
+		uint32_t msgID;
+		uint64_t expiration;
+		uint16_t size;
+		uint8_t chks;
+	};	
+
+	struct I2NPDatabaseStoreMsg
+	{
+		uint8_t key[32];
+		uint8_t type;
+		uint32_t replyToken;
+		uint16_t size;		
+	};
+
+	struct I2NPBuildRequestRecordClearText
+	{
+		uint32_t receiveTunnel;
+		uint8_t ourIdent[32];
+		uint32_t nextTunnel;
+		uint8_t nextIdent[32];
+		uint8_t layerKey[32];
+		uint8_t ivKey[32];
+		uint8_t replyKey[32];
+		uint8_t replyIV[16];
+		uint8_t flag;
+		uint32_t requestTime;
+		uint32_t nextMessageID;	
+		uint8_t filler[29];
+	};
+
+	struct I2NPBuildResponseRecord
+	{
+		uint8_t hash[32];
+		uint8_t padding[495];
+		uint8_t ret;
+	};	
+	
+	struct I2NPBuildRequestRecordElGamalEncrypted
+	{
+		uint8_t toPeer[16];
+		uint8_t encrypted[512];
+	};
+
+	struct TunnelGatewayHeader
+	{
+		uint32_t tunnelID;
+		uint16_t length;
+	};		
+
+	
+#pragma pack ()	
+
+	enum I2NPMessageType
+	{
+		eI2NPDatabaseStore = 1,
+		eI2NPDatabaseLookup = 2,
+		eI2NPDatabaseSearchReply = 3,
+		eI2NPDeliveryStatus = 10,
+		eI2NPGarlic = 11,
+		eI2NPTunnelData = 18,
+		eI2NPTunnelGateway = 19,
+		eI2NPData = 20,
+		eI2NPVariableTunnelBuild = 23,
+		eI2NPVariableTunnelBuildReply = 24	
+	};	
+
+	const int NTCP_MAX_MESSAGE_SIZE = 16384; 
+	struct I2NPMessage
+	{	
+		uint8_t buf[NTCP_MAX_MESSAGE_SIZE];	
+		size_t len, offset;
+
+		I2NPHeader * GetHeader () { return (I2NPHeader *)(buf + offset); };
+		uint8_t * GetPayload () { return buf + offset + sizeof(I2NPHeader); };
+		uint8_t * GetBuffer () { return buf + offset; };
+		size_t GetLength () const { return len - offset; };
+	};	
+	I2NPMessage * NewI2NPMessage ();
+	void DeleteI2NPMessage (I2NPMessage * msg);
+	void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID = 0);
+	I2NPMessage * CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, int len, uint32_t replyMsgID = 0);	
+	
+	I2NPMessage * CreateDeliveryStatusMsg ();
+	I2NPMessage * CreateDatabaseLookupMsg (const uint8_t * key, const uint8_t * from, uint32_t replyTunnelID);
+	I2NPMessage * CreateDatabaseStoreMsg ();
+	
+	void HandleDatabaseStoreMsg (uint8_t * buf, size_t len);
+	void HandleDatabaseSearchReplyMsg (uint8_t * buf, size_t len);
+	
+	
+	I2NPBuildRequestRecordClearText CreateBuildRequestRecord (
+		const uint8_t * ourIdent, uint32_t receiveTunnelID, 
+	    const uint8_t * nextIdent, uint32_t nextTunnelID, 
+	    const uint8_t * layerKey,const uint8_t * ivKey,                                                                 
+	    const uint8_t * replyKey, const uint8_t * replyIV, uint32_t nextMessageID,
+	          bool isGateway, bool isEndpoint);
+	void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, 
+		const I2NPBuildRequestRecordClearText& clearText,
+	    I2NPBuildRequestRecordElGamalEncrypted& record);
+		
+	void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);
+	void HandleVariableTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);
+	
+	I2NPMessage * CreateTunnelDataMsg (const uint8_t * buf);	
+	I2NPMessage * CreateTunnelDataMsg (uint32_t tunnelID, const uint8_t * payload);		
+	
+	void HandleTunnelGatewayMsg (uint8_t * buf, size_t len);
+		
+	void HandleI2NPMessage (uint8_t * msg, size_t len);
+	void HandleI2NPMessage (I2NPMessage * msg);
+}	
+
+#endif