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#ifndef I2NP_PROTOCOL_H__
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#define I2NP_PROTOCOL_H__
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#include <inttypes.h>
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#include <set>
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#include <cryptopp/sha.h>
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#include <string.h>
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#include "I2PEndian.h"
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#include "Identity.h"
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#include "RouterInfo.h"
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#include "LeaseSet.h"
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namespace i2p
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{
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// I2NP header
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const size_t I2NP_HEADER_TYPEID_OFFSET = 0;
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const size_t I2NP_HEADER_MSGID_OFFSET = I2NP_HEADER_TYPEID_OFFSET + 1;
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const size_t I2NP_HEADER_EXPIRATION_OFFSET = I2NP_HEADER_MSGID_OFFSET + 4;
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const size_t I2NP_HEADER_SIZE_OFFSET = I2NP_HEADER_EXPIRATION_OFFSET + 8;
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const size_t I2NP_HEADER_CHKS_OFFSET = I2NP_HEADER_SIZE_OFFSET + 2;
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const size_t I2NP_HEADER_SIZE = I2NP_HEADER_CHKS_OFFSET + 1;
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// I2NP short header
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const size_t I2NP_SHORT_HEADER_TYPEID_OFFSET = 0;
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const size_t I2NP_SHORT_HEADER_EXPIRATION_OFFSET = I2NP_SHORT_HEADER_TYPEID_OFFSET + 1;
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const size_t I2NP_SHORT_HEADER_SIZE = I2NP_SHORT_HEADER_EXPIRATION_OFFSET + 4;
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// Tunnel Gateway header
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const size_t TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET = 0;
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const size_t TUNNEL_GATEWAY_HEADER_LENGTH_OFFSET = TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET + 4;
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const size_t TUNNEL_GATEWAY_HEADER_SIZE = TUNNEL_GATEWAY_HEADER_LENGTH_OFFSET + 2;
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// DeliveryStatus
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const size_t DELIVERY_STATUS_MSGID_OFFSET = 0;
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const size_t DELIVERY_STATUS_TIMESTAMP_OFFSET = DELIVERY_STATUS_MSGID_OFFSET + 4;
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const size_t DELIVERY_STATUS_SIZE = DELIVERY_STATUS_TIMESTAMP_OFFSET + 8;
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// DatabaseStore
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const size_t DATABASE_STORE_KEY_OFFSET = 0;
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const size_t DATABASE_STORE_TYPE_OFFSET = DATABASE_STORE_KEY_OFFSET + 32;
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const size_t DATABASE_STORE_REPLY_TOKEN_OFFSET = DATABASE_STORE_TYPE_OFFSET + 1;
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const size_t DATABASE_STORE_HEADER_SIZE = DATABASE_STORE_REPLY_TOKEN_OFFSET + 4;
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#pragma pack (1)
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/*struct I2NPDatabaseStoreMsg
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{
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uint8_t key[32];
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uint8_t type;
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uint32_t replyToken;
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};*/
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struct I2NPBuildRequestRecordClearText
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{
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uint32_t receiveTunnel;
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uint8_t ourIdent[32];
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uint32_t nextTunnel;
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uint8_t nextIdent[32];
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uint8_t layerKey[32];
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uint8_t ivKey[32];
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uint8_t replyKey[32];
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uint8_t replyIV[16];
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uint8_t flag;
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uint32_t requestTime;
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uint32_t nextMessageID;
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uint8_t filler[29];
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};
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struct I2NPBuildResponseRecord
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{
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uint8_t hash[32];
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uint8_t padding[495];
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uint8_t ret;
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};
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struct I2NPBuildRequestRecordElGamalEncrypted
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{
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uint8_t toPeer[16];
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uint8_t encrypted[512];
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};
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#pragma pack ()
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enum I2NPMessageType
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{
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eI2NPDatabaseStore = 1,
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eI2NPDatabaseLookup = 2,
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eI2NPDatabaseSearchReply = 3,
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eI2NPDeliveryStatus = 10,
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eI2NPGarlic = 11,
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eI2NPTunnelData = 18,
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eI2NPTunnelGateway = 19,
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eI2NPData = 20,
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eI2NPTunnelBuild = 21,
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eI2NPTunnelBuildReply = 22,
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eI2NPVariableTunnelBuild = 23,
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eI2NPVariableTunnelBuildReply = 24
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};
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const int NUM_TUNNEL_BUILD_RECORDS = 8;
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namespace tunnel
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{
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class InboundTunnel;
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class TunnelPool;
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}
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const size_t I2NP_MAX_MESSAGE_SIZE = 32768;
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const size_t I2NP_MAX_SHORT_MESSAGE_SIZE = 2400;
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struct I2NPMessage
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{
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uint8_t * buf;
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size_t len, offset, maxLen;
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i2p::tunnel::InboundTunnel * from;
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I2NPMessage (): buf (nullptr),len (I2NP_HEADER_SIZE + 2),
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offset(2), maxLen (0), from (nullptr) {}; // reserve 2 bytes for NTCP header
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// header accessors
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uint8_t * GetHeader () { return GetBuffer (); };
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const uint8_t * GetHeader () const { return GetBuffer (); };
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void SetTypeID (uint8_t typeID) { GetHeader ()[I2NP_HEADER_TYPEID_OFFSET] = typeID; };
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uint8_t GetTypeID () const { return GetHeader ()[I2NP_HEADER_TYPEID_OFFSET]; };
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void SetMsgID (uint32_t msgID) { htobe32buf (GetHeader () + I2NP_HEADER_MSGID_OFFSET, msgID); };
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uint32_t GetMsgID () const { return bufbe32toh (GetHeader () + I2NP_HEADER_MSGID_OFFSET); };
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void SetExpiration (uint64_t expiration) { htobe64buf (GetHeader () + I2NP_HEADER_EXPIRATION_OFFSET, expiration); };
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uint64_t GetExpiration () const { return bufbe64toh (GetHeader () + I2NP_HEADER_EXPIRATION_OFFSET); };
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void SetSize (uint16_t size) { htobe16buf (GetHeader () + I2NP_HEADER_SIZE_OFFSET, size); };
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uint16_t GetSize () const { return bufbe16toh (GetHeader () + I2NP_HEADER_SIZE_OFFSET); };
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void UpdateSize () { SetSize (GetPayloadLength ()); };
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void SetChks (uint8_t chks) { GetHeader ()[I2NP_HEADER_CHKS_OFFSET] = chks; };
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void UpdateChks ()
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{
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uint8_t hash[32];
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CryptoPP::SHA256().CalculateDigest(hash, GetPayload (), GetPayloadLength ());
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GetHeader ()[I2NP_HEADER_CHKS_OFFSET] = hash[0];
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}
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// payload
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uint8_t * GetPayload () { return GetBuffer () + I2NP_HEADER_SIZE; };
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uint8_t * GetBuffer () { return buf + offset; };
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const uint8_t * GetBuffer () const { return buf + offset; };
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size_t GetLength () const { return len - offset; };
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size_t GetPayloadLength () const { return GetLength () - I2NP_HEADER_SIZE; };
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void Align (size_t alignment)
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{
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size_t rem = ((size_t)GetBuffer ()) % alignment;
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if (rem)
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{
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offset += (alignment - rem);
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len += (alignment - rem);
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}
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}
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I2NPMessage& operator=(const I2NPMessage& other)
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{
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memcpy (buf + offset, other.buf + other.offset, other.GetLength ());
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len = offset + other.GetLength ();
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from = other.from;
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return *this;
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}
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// for SSU only
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uint8_t * GetSSUHeader () { return buf + offset + I2NP_HEADER_SIZE - I2NP_SHORT_HEADER_SIZE; };
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void FromSSU (uint32_t msgID) // we have received SSU message and convert it to regular
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{
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const uint8_t * ssu = GetSSUHeader ();
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GetHeader ()[I2NP_HEADER_TYPEID_OFFSET] = ssu[I2NP_SHORT_HEADER_TYPEID_OFFSET]; // typeid
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SetMsgID (msgID);
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SetExpiration (bufbe32toh (ssu + I2NP_SHORT_HEADER_EXPIRATION_OFFSET)*1000LL);
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SetSize (len - offset - I2NP_HEADER_SIZE);
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SetChks (0);
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}
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uint32_t ToSSU () // return msgID
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{
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uint8_t header[I2NP_HEADER_SIZE];
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memcpy (header, GetHeader (), I2NP_HEADER_SIZE);
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uint8_t * ssu = GetSSUHeader ();
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ssu[I2NP_SHORT_HEADER_TYPEID_OFFSET] = header[I2NP_HEADER_TYPEID_OFFSET]; // typeid
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htobe32buf (ssu + I2NP_SHORT_HEADER_EXPIRATION_OFFSET, bufbe64toh (header + I2NP_HEADER_EXPIRATION_OFFSET)/1000LL);
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len = offset + I2NP_SHORT_HEADER_SIZE + bufbe16toh (header + I2NP_HEADER_SIZE_OFFSET);
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return bufbe32toh (header + I2NP_HEADER_MSGID_OFFSET);
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}
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};
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template<int sz>
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struct I2NPMessageBuffer: public I2NPMessage
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{
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I2NPMessageBuffer () { buf = m_Buffer; maxLen = sz; };
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uint8_t m_Buffer[sz];
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};
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I2NPMessage * NewI2NPMessage ();
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I2NPMessage * NewI2NPShortMessage ();
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I2NPMessage * NewI2NPMessage (size_t len);
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void DeleteI2NPMessage (I2NPMessage * msg);
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void FillI2NPMessageHeader (I2NPMessage * msg, I2NPMessageType msgType, uint32_t replyMsgID = 0);
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void RenewI2NPMessageHeader (I2NPMessage * msg);
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I2NPMessage * CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, int len, uint32_t replyMsgID = 0);
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I2NPMessage * CreateI2NPMessage (const uint8_t * buf, int len, i2p::tunnel::InboundTunnel * from = nullptr);
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I2NPMessage * CreateDeliveryStatusMsg (uint32_t msgID);
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I2NPMessage * CreateDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
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uint32_t replyTunnelID, bool exploratory = false,
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std::set<i2p::data::IdentHash> * excludedPeers = nullptr, bool encryption = false,
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i2p::tunnel::TunnelPool * pool = nullptr);
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I2NPMessage * CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
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const std::set<i2p::data::IdentHash>& excludedFloodfills,
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const i2p::tunnel::InboundTunnel * replyTunnel, const uint8_t * replyKey, const uint8_t * replyTag);
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I2NPMessage * CreateDatabaseSearchReply (const i2p::data::IdentHash& ident, const i2p::data::RouterInfo * floodfill);
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I2NPMessage * CreateDatabaseStoreMsg (const i2p::data::RouterInfo * router = nullptr);
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I2NPMessage * CreateDatabaseStoreMsg (const i2p::data::LeaseSet * leaseSet, uint32_t replyToken = 0);
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I2NPBuildRequestRecordClearText CreateBuildRequestRecord (
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const uint8_t * ourIdent, uint32_t receiveTunnelID,
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const uint8_t * nextIdent, uint32_t nextTunnelID,
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const uint8_t * layerKey,const uint8_t * ivKey,
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const uint8_t * replyKey, const uint8_t * replyIV, uint32_t nextMessageID,
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bool isGateway, bool isEndpoint);
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void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router,
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const I2NPBuildRequestRecordClearText& clearText,
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I2NPBuildRequestRecordElGamalEncrypted& record);
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bool HandleBuildRequestRecords (int num, I2NPBuildRequestRecordElGamalEncrypted * records, I2NPBuildRequestRecordClearText& clearText);
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void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);
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void HandleVariableTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);
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void HandleTunnelBuildMsg (uint8_t * buf, size_t len);
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I2NPMessage * CreateTunnelDataMsg (const uint8_t * buf);
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I2NPMessage * CreateTunnelDataMsg (uint32_t tunnelID, const uint8_t * payload);
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void HandleTunnelGatewayMsg (I2NPMessage * msg);
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I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, const uint8_t * buf, size_t len);
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I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, I2NPMessageType msgType,
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const uint8_t * buf, size_t len, uint32_t replyMsgID = 0);
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I2NPMessage * CreateTunnelGatewayMsg (uint32_t tunnelID, I2NPMessage * msg);
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size_t GetI2NPMessageLength (const uint8_t * msg);
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void HandleI2NPMessage (uint8_t * msg, size_t len);
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void HandleI2NPMessage (I2NPMessage * msg);
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}
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#endif
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