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300 lines
13 KiB
C++
300 lines
13 KiB
C++
/*
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* Copyright (c) 2013-2020, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*/
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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 <string.h>
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#include <set>
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#include <memory>
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#include "Crypto.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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// I2NP NTCP2 header
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const size_t I2NP_NTCP2_HEADER_SIZE = I2NP_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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// TunnelBuild
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const size_t TUNNEL_BUILD_RECORD_SIZE = 528;
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//BuildRequestRecordClearText
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const size_t BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
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const size_t BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET = BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;
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const size_t BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET + 32;
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const size_t BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET = BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET + 4;
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const size_t BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET = BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET + 32;
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const size_t BUILD_REQUEST_RECORD_IV_KEY_OFFSET = BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET + 32;
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const size_t BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET = BUILD_REQUEST_RECORD_IV_KEY_OFFSET + 32;
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const size_t BUILD_REQUEST_RECORD_REPLY_IV_OFFSET = BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET + 32;
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const size_t BUILD_REQUEST_RECORD_FLAG_OFFSET = BUILD_REQUEST_RECORD_REPLY_IV_OFFSET + 16;
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const size_t BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET = BUILD_REQUEST_RECORD_FLAG_OFFSET + 1;
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const size_t BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET = BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
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const size_t BUILD_REQUEST_RECORD_PADDING_OFFSET = BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET + 4;
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const size_t BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE = 222;
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// BuildRequestRecordEncrypted
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const size_t BUILD_REQUEST_RECORD_TO_PEER_OFFSET = 0;
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const size_t BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET = BUILD_REQUEST_RECORD_TO_PEER_OFFSET + 16;
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// BuildResponseRecord
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const size_t BUILD_RESPONSE_RECORD_HASH_OFFSET = 0;
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const size_t BUILD_RESPONSE_RECORD_PADDING_OFFSET = 32;
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const size_t BUILD_RESPONSE_RECORD_PADDING_SIZE = 495;
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const size_t BUILD_RESPONSE_RECORD_RET_OFFSET = BUILD_RESPONSE_RECORD_PADDING_OFFSET + BUILD_RESPONSE_RECORD_PADDING_SIZE;
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enum I2NPMessageType
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{
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eI2NPDummyMsg = 0,
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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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// DatabaseLookup flags
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const uint8_t DATABASE_LOOKUP_DELIVERY_FLAG = 0x01;
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const uint8_t DATABASE_LOOKUP_ENCRYPTION_FLAG = 0x02;
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const uint8_t DATABASE_LOOKUP_ECIES_FLAG = 0x10;
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const uint8_t DATABASE_LOOKUP_TYPE_FLAGS_MASK = 0x0C;
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const uint8_t DATABASE_LOOKUP_TYPE_NORMAL_LOOKUP = 0;
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const uint8_t DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP = 0x04; // 0100
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const uint8_t DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP = 0x08; // 1000
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const uint8_t DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP = 0x0C; // 1100
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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 = 62708;
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const size_t I2NP_MAX_SHORT_MESSAGE_SIZE = 4096;
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const unsigned int I2NP_MESSAGE_EXPIRATION_TIMEOUT = 8000; // in milliseconds (as initial RTT)
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const unsigned int I2NP_MESSAGE_CLOCK_SKEW = 60*1000; // 1 minute in milliseconds
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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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std::shared_ptr<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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SHA256(GetPayload (), GetPayloadLength (), hash);
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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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const uint8_t * GetPayload () const { 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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if (len + alignment > maxLen) return;
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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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size_t Concat (const uint8_t * buf1, size_t len1)
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{
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// make sure with don't write beyond maxLen
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if (len + len1 > maxLen) len1 = maxLen - len;
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memcpy (buf + len, buf1, len1);
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len += len1;
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return len1;
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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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// for NTCP2 only
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uint8_t * GetNTCP2Header () { return GetPayload () - I2NP_NTCP2_HEADER_SIZE; };
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size_t GetNTCP2Length () const { return GetPayloadLength () + I2NP_NTCP2_HEADER_SIZE; };
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void FromNTCP2 ()
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{
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const uint8_t * ntcp2 = GetNTCP2Header ();
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memcpy (GetHeader () + I2NP_HEADER_TYPEID_OFFSET, ntcp2 + I2NP_HEADER_TYPEID_OFFSET, 5); // typeid + msgid
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SetExpiration (bufbe32toh (ntcp2 + I2NP_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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void ToNTCP2 ()
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{
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uint8_t * ntcp2 = GetNTCP2Header ();
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htobe32buf (ntcp2 + I2NP_HEADER_EXPIRATION_OFFSET, bufbe64toh (GetHeader () + I2NP_HEADER_EXPIRATION_OFFSET)/1000LL);
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memcpy (ntcp2 + I2NP_HEADER_TYPEID_OFFSET, GetHeader () + I2NP_HEADER_TYPEID_OFFSET, 5); // typeid + msgid
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}
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void FillI2NPMessageHeader (I2NPMessageType msgType, uint32_t replyMsgID = 0, bool checksum = true);
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void RenewI2NPMessageHeader ();
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bool IsExpired () const;
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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 + 32]; // 16 alignment + 16 padding
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};
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std::shared_ptr<I2NPMessage> NewI2NPMessage ();
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std::shared_ptr<I2NPMessage> NewI2NPShortMessage ();
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std::shared_ptr<I2NPMessage> NewI2NPTunnelMessage ();
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std::shared_ptr<I2NPMessage> NewI2NPMessage (size_t len);
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std::shared_ptr<I2NPMessage> CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, size_t len, uint32_t replyMsgID = 0);
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std::shared_ptr<I2NPMessage> CreateI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from = nullptr);
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std::shared_ptr<I2NPMessage> CopyI2NPMessage (std::shared_ptr<I2NPMessage> msg);
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std::shared_ptr<I2NPMessage> CreateDeliveryStatusMsg (uint32_t msgID);
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std::shared_ptr<I2NPMessage> CreateRouterInfoDatabaseLookupMsg (const uint8_t * key, const uint8_t * from,
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uint32_t replyTunnelID, bool exploratory = false, std::set<i2p::data::IdentHash> * excludedPeers = nullptr);
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std::shared_ptr<I2NPMessage> CreateLeaseSetDatabaseLookupMsg (const i2p::data::IdentHash& dest,
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const std::set<i2p::data::IdentHash>& excludedFloodfills,
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std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel, const uint8_t * replyKey, const uint8_t * replyTag);
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std::shared_ptr<I2NPMessage> CreateDatabaseSearchReply (const i2p::data::IdentHash& ident, std::vector<i2p::data::IdentHash> routers);
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (std::shared_ptr<const i2p::data::RouterInfo> router = nullptr, uint32_t replyToken = 0);
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (const i2p::data::IdentHash& storeHash, std::shared_ptr<const i2p::data::LeaseSet> leaseSet); // for floodfill only
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (std::shared_ptr<const i2p::data::LocalLeaseSet> leaseSet, uint32_t replyToken = 0, std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel = nullptr);
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bool IsRouterInfoMsg (std::shared_ptr<I2NPMessage> msg);
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bool HandleBuildRequestRecords (int num, uint8_t * records, uint8_t * 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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std::shared_ptr<I2NPMessage> CreateTunnelDataMsg (const uint8_t * buf);
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std::shared_ptr<I2NPMessage> CreateTunnelDataMsg (uint32_t tunnelID, const uint8_t * payload);
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std::shared_ptr<I2NPMessage> CreateEmptyTunnelDataMsg ();
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std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, const uint8_t * buf, size_t len);
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std::shared_ptr<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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std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, std::shared_ptr<I2NPMessage> msg);
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size_t GetI2NPMessageLength (const uint8_t * msg, size_t len);
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void HandleI2NPMessage (uint8_t * msg, size_t len);
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void HandleI2NPMessage (std::shared_ptr<I2NPMessage> msg);
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class I2NPMessagesHandler
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{
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public:
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~I2NPMessagesHandler ();
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void PutNextMessage (std::shared_ptr<I2NPMessage> msg);
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void Flush ();
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private:
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std::vector<std::shared_ptr<I2NPMessage> > m_TunnelMsgs, m_TunnelGatewayMsgs;
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};
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const uint16_t DEFAULT_MAX_NUM_TRANSIT_TUNNELS = 2500;
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void SetMaxNumTransitTunnels (uint16_t maxNumTransitTunnels);
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uint16_t GetMaxNumTransitTunnels ();
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}
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#endif
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