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710 lines
22 KiB
C++
710 lines
22 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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#include <string.h>
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#include <atomic>
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#include "Base.h"
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#include "Log.h"
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#include "Crypto.h"
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#include "I2PEndian.h"
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#include "Timestamp.h"
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#include "RouterContext.h"
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#include "NetDb.hpp"
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#include "Tunnel.h"
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#include "Transports.h"
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#include "Garlic.h"
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#include "I2NPProtocol.h"
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#include "version.h"
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using namespace i2p::transport;
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namespace i2p
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{
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std::shared_ptr<I2NPMessage> NewI2NPMessage ()
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{
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return std::make_shared<I2NPMessageBuffer<I2NP_MAX_MESSAGE_SIZE> >();
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}
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std::shared_ptr<I2NPMessage> NewI2NPShortMessage ()
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{
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return std::make_shared<I2NPMessageBuffer<I2NP_MAX_SHORT_MESSAGE_SIZE> >();
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}
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std::shared_ptr<I2NPMessage> NewI2NPTunnelMessage ()
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{
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auto msg = new I2NPMessageBuffer<i2p::tunnel::TUNNEL_DATA_MSG_SIZE + I2NP_HEADER_SIZE + 34>(); // reserved for alignment and NTCP 16 + 6 + 12
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msg->Align (12);
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return std::shared_ptr<I2NPMessage>(msg);
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}
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std::shared_ptr<I2NPMessage> NewI2NPMessage (size_t len)
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{
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return (len < I2NP_MAX_SHORT_MESSAGE_SIZE - I2NP_HEADER_SIZE - 2) ? NewI2NPShortMessage () : NewI2NPMessage ();
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}
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void I2NPMessage::FillI2NPMessageHeader (I2NPMessageType msgType, uint32_t replyMsgID, bool checksum)
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{
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SetTypeID (msgType);
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if (!replyMsgID) RAND_bytes ((uint8_t *)&replyMsgID, 4);
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SetMsgID (replyMsgID);
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SetExpiration (i2p::util::GetMillisecondsSinceEpoch () + I2NP_MESSAGE_EXPIRATION_TIMEOUT);
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UpdateSize ();
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if (checksum) UpdateChks ();
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}
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void I2NPMessage::RenewI2NPMessageHeader ()
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{
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uint32_t msgID;
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RAND_bytes ((uint8_t *)&msgID, 4);
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SetMsgID (msgID);
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SetExpiration (i2p::util::GetMillisecondsSinceEpoch () + I2NP_MESSAGE_EXPIRATION_TIMEOUT);
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}
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bool I2NPMessage::IsExpired () const
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{
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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auto exp = GetExpiration ();
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return (ts > exp + I2NP_MESSAGE_CLOCK_SKEW) || (ts < exp - 3*I2NP_MESSAGE_CLOCK_SKEW); // check if expired or too far in future
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}
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std::shared_ptr<I2NPMessage> CreateI2NPMessage (I2NPMessageType msgType, const uint8_t * buf, size_t len, uint32_t replyMsgID)
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{
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auto msg = NewI2NPMessage (len);
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if (msg->Concat (buf, len) < len)
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LogPrint (eLogError, "I2NP: message length ", len, " exceeds max length ", msg->maxLen);
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msg->FillI2NPMessageHeader (msgType, replyMsgID);
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return msg;
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}
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std::shared_ptr<I2NPMessage> CreateI2NPMessage (const uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from)
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{
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auto msg = NewI2NPMessage ();
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if (msg->offset + len < msg->maxLen)
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{
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memcpy (msg->GetBuffer (), buf, len);
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msg->len = msg->offset + len;
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msg->from = from;
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}
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else
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LogPrint (eLogError, "I2NP: message length ", len, " exceeds max length");
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return msg;
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}
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std::shared_ptr<I2NPMessage> CopyI2NPMessage (std::shared_ptr<I2NPMessage> msg)
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{
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if (!msg) return nullptr;
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auto newMsg = NewI2NPMessage (msg->len);
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newMsg->offset = msg->offset;
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*newMsg = *msg;
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return newMsg;
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}
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std::shared_ptr<I2NPMessage> CreateDeliveryStatusMsg (uint32_t msgID)
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{
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auto m = NewI2NPShortMessage ();
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uint8_t * buf = m->GetPayload ();
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if (msgID)
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{
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htobe32buf (buf + DELIVERY_STATUS_MSGID_OFFSET, msgID);
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htobe64buf (buf + DELIVERY_STATUS_TIMESTAMP_OFFSET, i2p::util::GetMillisecondsSinceEpoch ());
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}
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else // for SSU establishment
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{
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RAND_bytes ((uint8_t *)&msgID, 4);
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htobe32buf (buf + DELIVERY_STATUS_MSGID_OFFSET, msgID);
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htobe64buf (buf + DELIVERY_STATUS_TIMESTAMP_OFFSET, i2p::context.GetNetID ());
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}
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m->len += DELIVERY_STATUS_SIZE;
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m->FillI2NPMessageHeader (eI2NPDeliveryStatus);
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return m;
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}
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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, std::set<i2p::data::IdentHash> * excludedPeers)
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{
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auto m = excludedPeers ? NewI2NPMessage () : NewI2NPShortMessage ();
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uint8_t * buf = m->GetPayload ();
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memcpy (buf, key, 32); // key
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buf += 32;
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memcpy (buf, from, 32); // from
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buf += 32;
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uint8_t flag = exploratory ? DATABASE_LOOKUP_TYPE_EXPLORATORY_LOOKUP : DATABASE_LOOKUP_TYPE_ROUTERINFO_LOOKUP;
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if (replyTunnelID)
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{
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*buf = flag | DATABASE_LOOKUP_DELIVERY_FLAG; // set delivery flag
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htobe32buf (buf+1, replyTunnelID);
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buf += 5;
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}
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else
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{
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*buf = flag; // flag
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buf++;
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}
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if (excludedPeers)
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{
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int cnt = excludedPeers->size ();
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htobe16buf (buf, cnt);
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buf += 2;
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for (auto& it: *excludedPeers)
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{
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memcpy (buf, it, 32);
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buf += 32;
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}
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}
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else
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{
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// nothing to exclude
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htobuf16 (buf, 0);
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buf += 2;
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}
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m->len += (buf - m->GetPayload ());
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m->FillI2NPMessageHeader (eI2NPDatabaseLookup);
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return m;
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}
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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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{
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int cnt = excludedFloodfills.size ();
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auto m = cnt > 7 ? NewI2NPMessage () : NewI2NPShortMessage ();
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uint8_t * buf = m->GetPayload ();
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memcpy (buf, dest, 32); // key
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buf += 32;
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memcpy (buf, replyTunnel->GetNextIdentHash (), 32); // reply tunnel GW
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buf += 32;
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*buf = DATABASE_LOOKUP_DELIVERY_FLAG | DATABASE_LOOKUP_ENCRYPTION_FLAG | DATABASE_LOOKUP_TYPE_LEASESET_LOOKUP; // flags
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buf ++;
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htobe32buf (buf, replyTunnel->GetNextTunnelID ()); // reply tunnel ID
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buf += 4;
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// excluded
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if (cnt > 512)
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{
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LogPrint (eLogWarning, "I2NP: Too many peers to exclude ", cnt, " for DatabaseLookup");
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cnt = 0;
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}
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htobe16buf (buf, cnt);
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buf += 2;
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if (cnt > 0)
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{
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for (auto& it: excludedFloodfills)
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{
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memcpy (buf, it, 32);
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buf += 32;
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}
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}
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// encryption
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memcpy (buf, replyKey, 32);
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buf[32] = 1; // 1 tag
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memcpy (buf + 33, replyTag, 32);
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buf += 65;
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m->len += (buf - m->GetPayload ());
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m->FillI2NPMessageHeader (eI2NPDatabaseLookup);
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return m;
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}
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std::shared_ptr<I2NPMessage> CreateDatabaseSearchReply (const i2p::data::IdentHash& ident,
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std::vector<i2p::data::IdentHash> routers)
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{
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auto m = NewI2NPShortMessage ();
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uint8_t * buf = m->GetPayload ();
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size_t len = 0;
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memcpy (buf, ident, 32);
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len += 32;
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buf[len] = routers.size ();
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len++;
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for (const auto& it: routers)
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{
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memcpy (buf + len, it, 32);
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len += 32;
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}
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memcpy (buf + len, i2p::context.GetRouterInfo ().GetIdentHash (), 32);
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len += 32;
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m->len += len;
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m->FillI2NPMessageHeader (eI2NPDatabaseSearchReply);
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return m;
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}
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (std::shared_ptr<const i2p::data::RouterInfo> router, uint32_t replyToken)
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{
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if (!router) // we send own RouterInfo
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router = context.GetSharedRouterInfo ();
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auto m = NewI2NPShortMessage ();
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uint8_t * payload = m->GetPayload ();
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memcpy (payload + DATABASE_STORE_KEY_OFFSET, router->GetIdentHash (), 32);
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payload[DATABASE_STORE_TYPE_OFFSET] = 0; // RouterInfo
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htobe32buf (payload + DATABASE_STORE_REPLY_TOKEN_OFFSET, replyToken);
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uint8_t * buf = payload + DATABASE_STORE_HEADER_SIZE;
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if (replyToken)
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{
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memset (buf, 0, 4); // zero tunnelID means direct reply
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buf += 4;
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memcpy (buf, router->GetIdentHash (), 32);
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buf += 32;
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}
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uint8_t * sizePtr = buf;
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buf += 2;
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m->len += (buf - payload); // payload size
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size_t size = i2p::data::GzipNoCompression (router->GetBuffer (), router->GetBufferLen (), buf, m->maxLen -m->len);
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if (size)
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{
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htobe16buf (sizePtr, size); // size
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m->len += size;
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}
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else
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m = nullptr;
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if (m)
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m->FillI2NPMessageHeader (eI2NPDatabaseStore);
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return m;
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}
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (const i2p::data::IdentHash& storeHash, std::shared_ptr<const i2p::data::LeaseSet> leaseSet)
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{
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if (!leaseSet) return nullptr;
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auto m = NewI2NPShortMessage ();
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uint8_t * payload = m->GetPayload ();
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memcpy (payload + DATABASE_STORE_KEY_OFFSET, storeHash, 32);
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payload[DATABASE_STORE_TYPE_OFFSET] = leaseSet->GetStoreType (); // 1 for LeaseSet
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htobe32buf (payload + DATABASE_STORE_REPLY_TOKEN_OFFSET, 0);
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size_t size = DATABASE_STORE_HEADER_SIZE;
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memcpy (payload + size, leaseSet->GetBuffer (), leaseSet->GetBufferLen ());
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size += leaseSet->GetBufferLen ();
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m->len += size;
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m->FillI2NPMessageHeader (eI2NPDatabaseStore);
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return m;
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}
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std::shared_ptr<I2NPMessage> CreateDatabaseStoreMsg (std::shared_ptr<const i2p::data::LocalLeaseSet> leaseSet, uint32_t replyToken, std::shared_ptr<const i2p::tunnel::InboundTunnel> replyTunnel)
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{
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if (!leaseSet) return nullptr;
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auto m = NewI2NPShortMessage ();
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uint8_t * payload = m->GetPayload ();
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memcpy (payload + DATABASE_STORE_KEY_OFFSET, leaseSet->GetStoreHash (), 32);
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payload[DATABASE_STORE_TYPE_OFFSET] = leaseSet->GetStoreType (); // LeaseSet or LeaseSet2
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htobe32buf (payload + DATABASE_STORE_REPLY_TOKEN_OFFSET, replyToken);
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size_t size = DATABASE_STORE_HEADER_SIZE;
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if (replyToken && replyTunnel)
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{
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if (replyTunnel)
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{
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htobe32buf (payload + size, replyTunnel->GetNextTunnelID ());
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size += 4; // reply tunnelID
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memcpy (payload + size, replyTunnel->GetNextIdentHash (), 32);
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size += 32; // reply tunnel gateway
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}
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else
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htobe32buf (payload + DATABASE_STORE_REPLY_TOKEN_OFFSET, 0);
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}
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memcpy (payload + size, leaseSet->GetBuffer (), leaseSet->GetBufferLen ());
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size += leaseSet->GetBufferLen ();
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m->len += size;
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m->FillI2NPMessageHeader (eI2NPDatabaseStore);
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return m;
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}
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bool IsRouterInfoMsg (std::shared_ptr<I2NPMessage> msg)
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{
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if (!msg || msg->GetTypeID () != eI2NPDatabaseStore) return false;
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return !msg->GetPayload ()[DATABASE_STORE_TYPE_OFFSET]; // 0- RouterInfo
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}
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static uint16_t g_MaxNumTransitTunnels = DEFAULT_MAX_NUM_TRANSIT_TUNNELS; // TODO:
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void SetMaxNumTransitTunnels (uint16_t maxNumTransitTunnels)
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{
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if (maxNumTransitTunnels > 0 && g_MaxNumTransitTunnels != maxNumTransitTunnels)
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{
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LogPrint (eLogDebug, "I2NP: Max number of transit tunnels set to ", maxNumTransitTunnels);
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g_MaxNumTransitTunnels = maxNumTransitTunnels;
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}
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}
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uint16_t GetMaxNumTransitTunnels ()
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{
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return g_MaxNumTransitTunnels;
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}
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bool HandleBuildRequestRecords (int num, uint8_t * records, uint8_t * clearText)
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{
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for (int i = 0; i < num; i++)
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{
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uint8_t * record = records + i*TUNNEL_BUILD_RECORD_SIZE;
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if (!memcmp (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)i2p::context.GetRouterInfo ().GetIdentHash (), 16))
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{
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LogPrint (eLogDebug, "I2NP: Build request record ", i, " is ours");
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BN_CTX * ctx = BN_CTX_new ();
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i2p::context.DecryptTunnelBuildRecord (record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET, clearText, ctx);
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BN_CTX_free (ctx);
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// replace record to reply
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if (i2p::context.AcceptsTunnels () &&
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i2p::tunnel::tunnels.GetTransitTunnels ().size () <= g_MaxNumTransitTunnels &&
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!i2p::transport::transports.IsBandwidthExceeded () &&
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!i2p::transport::transports.IsTransitBandwidthExceeded ())
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{
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auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
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clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
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clearText + BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
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clearText + BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
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clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x80,
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clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET ] & 0x40);
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i2p::tunnel::tunnels.AddTransitTunnel (transitTunnel);
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record[BUILD_RESPONSE_RECORD_RET_OFFSET] = 0;
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}
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else
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record[BUILD_RESPONSE_RECORD_RET_OFFSET] = 30; // always reject with bandwidth reason (30)
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//TODO: fill filler
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SHA256 (record + BUILD_RESPONSE_RECORD_PADDING_OFFSET, BUILD_RESPONSE_RECORD_PADDING_SIZE + 1, // + 1 byte of ret
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record + BUILD_RESPONSE_RECORD_HASH_OFFSET);
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// encrypt reply
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i2p::crypto::CBCEncryption encryption;
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for (int j = 0; j < num; j++)
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{
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encryption.SetKey (clearText + BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET);
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encryption.SetIV (clearText + BUILD_REQUEST_RECORD_REPLY_IV_OFFSET);
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uint8_t * reply = records + j*TUNNEL_BUILD_RECORD_SIZE;
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encryption.Encrypt(reply, TUNNEL_BUILD_RECORD_SIZE, reply);
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}
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return true;
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}
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}
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return false;
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}
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void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
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{
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int num = buf[0];
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LogPrint (eLogDebug, "I2NP: VariableTunnelBuild ", num, " records");
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if (len < num*BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 1)
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{
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LogPrint (eLogError, "VaribleTunnelBuild message of ", num, " records is too short ", len);
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return;
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}
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auto tunnel = i2p::tunnel::tunnels.GetPendingInboundTunnel (replyMsgID);
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if (tunnel)
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{
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// endpoint of inbound tunnel
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LogPrint (eLogDebug, "I2NP: VariableTunnelBuild reply for tunnel ", tunnel->GetTunnelID ());
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if (tunnel->HandleTunnelBuildResponse (buf, len))
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{
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LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been created");
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tunnel->SetState (i2p::tunnel::eTunnelStateEstablished);
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i2p::tunnel::tunnels.AddInboundTunnel (tunnel);
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}
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else
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{
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LogPrint (eLogInfo, "I2NP: Inbound tunnel ", tunnel->GetTunnelID (), " has been declined");
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tunnel->SetState (i2p::tunnel::eTunnelStateBuildFailed);
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}
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}
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else
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{
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uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
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if (HandleBuildRequestRecords (num, buf + 1, clearText))
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{
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if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outboud tunnel
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{
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// so we send it to reply tunnel
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
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eI2NPVariableTunnelBuildReply, buf, len,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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else
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transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
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CreateI2NPMessage (eI2NPVariableTunnelBuild, buf, len,
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bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
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}
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}
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}
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void HandleTunnelBuildMsg (uint8_t * buf, size_t len)
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{
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if (len < NUM_TUNNEL_BUILD_RECORDS*BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE)
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{
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LogPrint (eLogError, "TunnelBuild message is too short ", len);
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return;
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|
}
|
|
uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
|
|
if (HandleBuildRequestRecords (NUM_TUNNEL_BUILD_RECORDS, buf, clearText))
|
|
{
|
|
if (clearText[BUILD_REQUEST_RECORD_FLAG_OFFSET] & 0x40) // we are endpoint of outbound tunnel
|
|
{
|
|
// so we send it to reply tunnel
|
|
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
|
|
CreateTunnelGatewayMsg (bufbe32toh (clearText + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
|
|
eI2NPTunnelBuildReply, buf, len,
|
|
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
|
|
}
|
|
else
|
|
transports.SendMessage (clearText + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
|
|
CreateI2NPMessage (eI2NPTunnelBuild, buf, len,
|
|
bufbe32toh (clearText + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET)));
|
|
}
|
|
}
|
|
|
|
void HandleVariableTunnelBuildReplyMsg (uint32_t replyMsgID, uint8_t * buf, size_t len)
|
|
{
|
|
int num = buf[0];
|
|
LogPrint (eLogDebug, "I2NP: VariableTunnelBuildReplyMsg of ", num, " records replyMsgID=", replyMsgID);
|
|
if (len < num*BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE + 1)
|
|
{
|
|
LogPrint (eLogError, "VaribleTunnelBuildReply message of ", num, " records is too short ", len);
|
|
return;
|
|
}
|
|
|
|
auto tunnel = i2p::tunnel::tunnels.GetPendingOutboundTunnel (replyMsgID);
|
|
if (tunnel)
|
|
{
|
|
// reply for outbound tunnel
|
|
if (tunnel->HandleTunnelBuildResponse (buf, len))
|
|
{
|
|
LogPrint (eLogInfo, "I2NP: Outbound tunnel ", tunnel->GetTunnelID (), " has been created");
|
|
tunnel->SetState (i2p::tunnel::eTunnelStateEstablished);
|
|
i2p::tunnel::tunnels.AddOutboundTunnel (tunnel);
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogInfo, "I2NP: Outbound tunnel ", tunnel->GetTunnelID (), " has been declined");
|
|
tunnel->SetState (i2p::tunnel::eTunnelStateBuildFailed);
|
|
}
|
|
}
|
|
else
|
|
LogPrint (eLogWarning, "I2NP: Pending tunnel for message ", replyMsgID, " not found");
|
|
}
|
|
|
|
|
|
std::shared_ptr<I2NPMessage> CreateTunnelDataMsg (const uint8_t * buf)
|
|
{
|
|
auto msg = NewI2NPTunnelMessage ();
|
|
msg->Concat (buf, i2p::tunnel::TUNNEL_DATA_MSG_SIZE);
|
|
msg->FillI2NPMessageHeader (eI2NPTunnelData);
|
|
return msg;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> CreateTunnelDataMsg (uint32_t tunnelID, const uint8_t * payload)
|
|
{
|
|
auto msg = NewI2NPTunnelMessage ();
|
|
htobe32buf (msg->GetPayload (), tunnelID);
|
|
msg->len += 4; // tunnelID
|
|
msg->Concat (payload, i2p::tunnel::TUNNEL_DATA_MSG_SIZE - 4);
|
|
msg->FillI2NPMessageHeader (eI2NPTunnelData);
|
|
return msg;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> CreateEmptyTunnelDataMsg ()
|
|
{
|
|
auto msg = NewI2NPTunnelMessage ();
|
|
msg->len += i2p::tunnel::TUNNEL_DATA_MSG_SIZE;
|
|
return msg;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, const uint8_t * buf, size_t len)
|
|
{
|
|
auto msg = NewI2NPMessage (len);
|
|
uint8_t * payload = msg->GetPayload ();
|
|
htobe32buf (payload + TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET, tunnelID);
|
|
htobe16buf (payload + TUNNEL_GATEWAY_HEADER_LENGTH_OFFSET, len);
|
|
msg->len += TUNNEL_GATEWAY_HEADER_SIZE;
|
|
if (msg->Concat (buf, len) < len)
|
|
LogPrint (eLogError, "I2NP: tunnel gateway buffer overflow ", msg->maxLen);
|
|
msg->FillI2NPMessageHeader (eI2NPTunnelGateway);
|
|
return msg;
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
if (msg->offset >= I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE)
|
|
{
|
|
// message is capable to be used without copying
|
|
uint8_t * payload = msg->GetBuffer () - TUNNEL_GATEWAY_HEADER_SIZE;
|
|
htobe32buf (payload + TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET, tunnelID);
|
|
int len = msg->GetLength ();
|
|
htobe16buf (payload + TUNNEL_GATEWAY_HEADER_LENGTH_OFFSET, len);
|
|
msg->offset -= (I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE);
|
|
msg->len = msg->offset + I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE +len;
|
|
msg->FillI2NPMessageHeader (eI2NPTunnelGateway);
|
|
return msg;
|
|
}
|
|
else
|
|
return CreateTunnelGatewayMsg (tunnelID, msg->GetBuffer (), msg->GetLength ());
|
|
}
|
|
|
|
std::shared_ptr<I2NPMessage> CreateTunnelGatewayMsg (uint32_t tunnelID, I2NPMessageType msgType,
|
|
const uint8_t * buf, size_t len, uint32_t replyMsgID)
|
|
{
|
|
auto msg = NewI2NPMessage (len);
|
|
size_t gatewayMsgOffset = I2NP_HEADER_SIZE + TUNNEL_GATEWAY_HEADER_SIZE;
|
|
msg->offset += gatewayMsgOffset;
|
|
msg->len += gatewayMsgOffset;
|
|
if (msg->Concat (buf, len) < len)
|
|
LogPrint (eLogError, "I2NP: tunnel gateway buffer overflow ", msg->maxLen);
|
|
msg->FillI2NPMessageHeader (msgType, replyMsgID); // create content message
|
|
len = msg->GetLength ();
|
|
msg->offset -= gatewayMsgOffset;
|
|
uint8_t * payload = msg->GetPayload ();
|
|
htobe32buf (payload + TUNNEL_GATEWAY_HEADER_TUNNELID_OFFSET, tunnelID);
|
|
htobe16buf (payload + TUNNEL_GATEWAY_HEADER_LENGTH_OFFSET, len);
|
|
msg->FillI2NPMessageHeader (eI2NPTunnelGateway); // gateway message
|
|
return msg;
|
|
}
|
|
|
|
size_t GetI2NPMessageLength (const uint8_t * msg, size_t len)
|
|
{
|
|
if (len < I2NP_HEADER_SIZE_OFFSET + 2)
|
|
{
|
|
LogPrint (eLogError, "I2NP: message length ", len, " is smaller than header");
|
|
return len;
|
|
}
|
|
auto l = bufbe16toh (msg + I2NP_HEADER_SIZE_OFFSET) + I2NP_HEADER_SIZE;
|
|
if (l > len)
|
|
{
|
|
LogPrint (eLogError, "I2NP: message length ", l, " exceeds buffer length ", len);
|
|
l = len;
|
|
}
|
|
return l;
|
|
}
|
|
|
|
void HandleI2NPMessage (uint8_t * msg, size_t len)
|
|
{
|
|
if (len < I2NP_HEADER_SIZE)
|
|
{
|
|
LogPrint (eLogError, "I2NP: message length ", len, " is smaller than header");
|
|
return;
|
|
}
|
|
uint8_t typeID = msg[I2NP_HEADER_TYPEID_OFFSET];
|
|
uint32_t msgID = bufbe32toh (msg + I2NP_HEADER_MSGID_OFFSET);
|
|
LogPrint (eLogDebug, "I2NP: msg received len=", len,", type=", (int)typeID, ", msgID=", (unsigned int)msgID);
|
|
uint8_t * buf = msg + I2NP_HEADER_SIZE;
|
|
auto size = bufbe16toh (msg + I2NP_HEADER_SIZE_OFFSET);
|
|
len -= I2NP_HEADER_SIZE;
|
|
if (size > len)
|
|
{
|
|
LogPrint (eLogError, "I2NP: payload size ", size, " exceeds buffer length ", len);
|
|
size = len;
|
|
}
|
|
switch (typeID)
|
|
{
|
|
case eI2NPVariableTunnelBuild:
|
|
HandleVariableTunnelBuildMsg (msgID, buf, size);
|
|
break;
|
|
case eI2NPVariableTunnelBuildReply:
|
|
HandleVariableTunnelBuildReplyMsg (msgID, buf, size);
|
|
break;
|
|
case eI2NPTunnelBuild:
|
|
HandleTunnelBuildMsg (buf, size);
|
|
break;
|
|
case eI2NPTunnelBuildReply:
|
|
// TODO:
|
|
break;
|
|
default:
|
|
LogPrint (eLogWarning, "I2NP: Unexpected message ", (int)typeID);
|
|
}
|
|
}
|
|
|
|
void HandleI2NPMessage (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
if (msg)
|
|
{
|
|
uint8_t typeID = msg->GetTypeID ();
|
|
LogPrint (eLogDebug, "I2NP: Handling message with type ", (int)typeID);
|
|
switch (typeID)
|
|
{
|
|
case eI2NPTunnelData:
|
|
i2p::tunnel::tunnels.PostTunnelData (msg);
|
|
break;
|
|
case eI2NPTunnelGateway:
|
|
i2p::tunnel::tunnels.PostTunnelData (msg);
|
|
break;
|
|
case eI2NPGarlic:
|
|
{
|
|
if (msg->from)
|
|
{
|
|
if (msg->from->GetTunnelPool ())
|
|
msg->from->GetTunnelPool ()->ProcessGarlicMessage (msg);
|
|
else
|
|
LogPrint (eLogInfo, "I2NP: Local destination for garlic doesn't exist anymore");
|
|
}
|
|
else
|
|
i2p::context.ProcessGarlicMessage (msg);
|
|
break;
|
|
}
|
|
case eI2NPDatabaseStore:
|
|
case eI2NPDatabaseSearchReply:
|
|
case eI2NPDatabaseLookup:
|
|
// forward to netDb
|
|
i2p::data::netdb.PostI2NPMsg (msg);
|
|
break;
|
|
case eI2NPDeliveryStatus:
|
|
{
|
|
if (msg->from && msg->from->GetTunnelPool ())
|
|
msg->from->GetTunnelPool ()->ProcessDeliveryStatus (msg);
|
|
else
|
|
i2p::context.ProcessDeliveryStatusMessage (msg);
|
|
break;
|
|
}
|
|
case eI2NPVariableTunnelBuild:
|
|
case eI2NPVariableTunnelBuildReply:
|
|
case eI2NPTunnelBuild:
|
|
case eI2NPTunnelBuildReply:
|
|
// forward to tunnel thread
|
|
i2p::tunnel::tunnels.PostTunnelData (msg);
|
|
break;
|
|
default:
|
|
HandleI2NPMessage (msg->GetBuffer (), msg->GetLength ());
|
|
}
|
|
}
|
|
}
|
|
|
|
I2NPMessagesHandler::~I2NPMessagesHandler ()
|
|
{
|
|
Flush ();
|
|
}
|
|
|
|
void I2NPMessagesHandler::PutNextMessage (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
if (msg)
|
|
{
|
|
switch (msg->GetTypeID ())
|
|
{
|
|
case eI2NPTunnelData:
|
|
m_TunnelMsgs.push_back (msg);
|
|
break;
|
|
case eI2NPTunnelGateway:
|
|
m_TunnelGatewayMsgs.push_back (msg);
|
|
break;
|
|
default:
|
|
HandleI2NPMessage (msg);
|
|
}
|
|
}
|
|
}
|
|
|
|
void I2NPMessagesHandler::Flush ()
|
|
{
|
|
if (!m_TunnelMsgs.empty ())
|
|
{
|
|
i2p::tunnel::tunnels.PostTunnelData (m_TunnelMsgs);
|
|
m_TunnelMsgs.clear ();
|
|
}
|
|
if (!m_TunnelGatewayMsgs.empty ())
|
|
{
|
|
i2p::tunnel::tunnels.PostTunnelData (m_TunnelGatewayMsgs);
|
|
m_TunnelGatewayMsgs.clear ();
|
|
}
|
|
}
|
|
}
|