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1043 lines
31 KiB
C++
1043 lines
31 KiB
C++
/*
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* Copyright (c) 2013-2023, 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 <stdlib.h>
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#include <openssl/rand.h>
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#include "I2PEndian.h"
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#include "Log.h"
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#include "Timestamp.h"
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#include "LeaseSet.h"
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#include "ClientContext.h"
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#include "Transports.h"
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#include "Signature.h"
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#include "I2CP.h"
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namespace i2p
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{
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namespace client
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{
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I2CPDestination::I2CPDestination (boost::asio::io_service& service, std::shared_ptr<I2CPSession> owner,
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std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic, const std::map<std::string, std::string>& params):
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LeaseSetDestination (service, isPublic, ¶ms),
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m_Owner (owner), m_Identity (identity), m_EncryptionKeyType (m_Identity->GetCryptoKeyType ()),
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m_IsCreatingLeaseSet (false), m_LeaseSetCreationTimer (service)
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{
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}
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void I2CPDestination::Stop ()
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{
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LeaseSetDestination::Stop ();
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m_Owner = nullptr;
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m_LeaseSetCreationTimer.cancel ();
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}
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void I2CPDestination::SetEncryptionPrivateKey (const uint8_t * key)
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{
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m_Decryptor = i2p::data::PrivateKeys::CreateDecryptor (m_Identity->GetCryptoKeyType (), key);
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}
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void I2CPDestination::SetECIESx25519EncryptionPrivateKey (const uint8_t * key)
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{
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if (!m_ECIESx25519Decryptor || memcmp (m_ECIESx25519PrivateKey, key, 32)) // new key?
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{
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m_ECIESx25519Decryptor = std::make_shared<i2p::crypto::ECIESX25519AEADRatchetDecryptor>(key, true); // calculate public
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memcpy (m_ECIESx25519PrivateKey, key, 32);
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}
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}
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bool I2CPDestination::Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const
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{
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if (preferredCrypto == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD && m_ECIESx25519Decryptor)
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return m_ECIESx25519Decryptor->Decrypt (encrypted, data);
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if (m_Decryptor)
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return m_Decryptor->Decrypt (encrypted, data);
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else
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LogPrint (eLogError, "I2CP: Decryptor is not set");
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return false;
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}
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const uint8_t * I2CPDestination::GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const
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{
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if (keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD && m_ECIESx25519Decryptor)
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return m_ECIESx25519Decryptor->GetPubicKey ();
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return nullptr;
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}
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bool I2CPDestination::SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const
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{
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return keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ? (bool)m_ECIESx25519Decryptor : m_EncryptionKeyType == keyType;
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}
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void I2CPDestination::HandleDataMessage (const uint8_t * buf, size_t len)
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{
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uint32_t length = bufbe32toh (buf);
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if (length > len - 4) length = len - 4;
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if (m_Owner)
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m_Owner->SendMessagePayloadMessage (buf + 4, length);
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}
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void I2CPDestination::CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels)
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{
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GetService ().post (std::bind (&I2CPDestination::PostCreateNewLeaseSet, this, tunnels));
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}
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void I2CPDestination::PostCreateNewLeaseSet (std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels)
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{
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if (m_IsCreatingLeaseSet)
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{
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LogPrint (eLogInfo, "I2CP: LeaseSet is being created");
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return;
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}
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uint8_t priv[256] = {0};
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i2p::data::LocalLeaseSet ls (m_Identity, priv, tunnels); // we don't care about encryption key, we need leases only
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m_LeaseSetExpirationTime = ls.GetExpirationTime ();
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uint8_t * leases = ls.GetLeases ();
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leases[-1] = tunnels.size ();
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if (m_Owner)
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{
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uint16_t sessionID = m_Owner->GetSessionID ();
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if (sessionID != 0xFFFF)
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{
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m_IsCreatingLeaseSet = true;
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htobe16buf (leases - 3, sessionID);
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size_t l = 2/*sessionID*/ + 1/*num leases*/ + i2p::data::LEASE_SIZE*tunnels.size ();
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m_Owner->SendI2CPMessage (I2CP_REQUEST_VARIABLE_LEASESET_MESSAGE, leases - 3, l);
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m_LeaseSetCreationTimer.expires_from_now (boost::posix_time::seconds (I2CP_LEASESET_CREATION_TIMEOUT));
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auto s = GetSharedFromThis ();
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m_LeaseSetCreationTimer.async_wait ([s](const boost::system::error_code& ecode)
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{
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if (ecode != boost::asio::error::operation_aborted)
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{
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LogPrint (eLogInfo, "I2CP: LeaseSet creation timeout expired. Terminate");
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if (s->m_Owner) s->m_Owner->Stop ();
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}
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});
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}
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}
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}
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void I2CPDestination::LeaseSetCreated (const uint8_t * buf, size_t len)
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{
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m_IsCreatingLeaseSet = false;
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m_LeaseSetCreationTimer.cancel ();
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auto ls = std::make_shared<i2p::data::LocalLeaseSet> (m_Identity, buf, len);
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ls->SetExpirationTime (m_LeaseSetExpirationTime);
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SetLeaseSet (ls);
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}
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void I2CPDestination::LeaseSet2Created (uint8_t storeType, const uint8_t * buf, size_t len)
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{
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m_IsCreatingLeaseSet = false;
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m_LeaseSetCreationTimer.cancel ();
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auto ls = (storeType == i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2) ?
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std::make_shared<i2p::data::LocalEncryptedLeaseSet2> (m_Identity, buf, len):
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std::make_shared<i2p::data::LocalLeaseSet2> (storeType, m_Identity, buf, len);
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ls->SetExpirationTime (m_LeaseSetExpirationTime);
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SetLeaseSet (ls);
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}
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void I2CPDestination::SendMsgTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident, uint32_t nonce)
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{
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auto msg = m_I2NPMsgsPool.AcquireSharedMt ();
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uint8_t * buf = msg->GetPayload ();
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htobe32buf (buf, len);
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memcpy (buf + 4, payload, len);
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msg->len += len + 4;
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msg->FillI2NPMessageHeader (eI2NPData);
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auto s = GetSharedFromThis ();
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auto remote = FindLeaseSet (ident);
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if (remote)
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{
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GetService ().post (
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[s, msg, remote, nonce]()
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{
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bool sent = s->SendMsg (msg, remote);
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if (s->m_Owner)
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s->m_Owner->SendMessageStatusMessage (nonce, sent ? eI2CPMessageStatusGuaranteedSuccess : eI2CPMessageStatusGuaranteedFailure);
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});
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}
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else
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{
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RequestDestination (ident,
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[s, msg, nonce](std::shared_ptr<i2p::data::LeaseSet> ls)
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{
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if (ls)
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{
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bool sent = s->SendMsg (msg, ls);
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if (s->m_Owner)
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s->m_Owner->SendMessageStatusMessage (nonce, sent ? eI2CPMessageStatusGuaranteedSuccess : eI2CPMessageStatusGuaranteedFailure);
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}
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else if (s->m_Owner)
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s->m_Owner->SendMessageStatusMessage (nonce, eI2CPMessageStatusNoLeaseSet);
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});
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}
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}
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bool I2CPDestination::SendMsg (std::shared_ptr<I2NPMessage> msg, std::shared_ptr<const i2p::data::LeaseSet> remote)
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{
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auto remoteSession = GetRoutingSession (remote, true);
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if (!remoteSession)
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{
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LogPrint (eLogError, "I2CP: Failed to create remote session");
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return false;
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}
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auto path = remoteSession->GetSharedRoutingPath ();
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std::shared_ptr<i2p::tunnel::OutboundTunnel> outboundTunnel;
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std::shared_ptr<const i2p::data::Lease> remoteLease;
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if (path)
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{
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if (!remoteSession->CleanupUnconfirmedTags ()) // no stuck tags
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{
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outboundTunnel = path->outboundTunnel;
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remoteLease = path->remoteLease;
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}
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else
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remoteSession->SetSharedRoutingPath (nullptr);
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}
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else
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{
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auto leases = remote->GetNonExpiredLeases (false); // without threshold
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if (leases.empty ())
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leases = remote->GetNonExpiredLeases (true); // with threshold
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if (!leases.empty ())
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{
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remoteLease = leases[rand () % leases.size ()];
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auto leaseRouter = i2p::data::netdb.FindRouter (remoteLease->tunnelGateway);
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outboundTunnel = GetTunnelPool ()->GetNextOutboundTunnel (nullptr,
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leaseRouter ? leaseRouter->GetCompatibleTransports (false) : (i2p::data::RouterInfo::CompatibleTransports)i2p::data::RouterInfo::eAllTransports);
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}
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if (remoteLease && outboundTunnel)
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remoteSession->SetSharedRoutingPath (std::make_shared<i2p::garlic::GarlicRoutingPath> (
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i2p::garlic::GarlicRoutingPath{outboundTunnel, remoteLease, 10000, 0, 0})); // 10 secs RTT
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else
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remoteSession->SetSharedRoutingPath (nullptr);
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}
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if (remoteLease && outboundTunnel)
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{
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std::vector<i2p::tunnel::TunnelMessageBlock> msgs;
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auto garlic = remoteSession->WrapSingleMessage (msg);
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msgs.push_back (i2p::tunnel::TunnelMessageBlock
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{
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i2p::tunnel::eDeliveryTypeTunnel,
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remoteLease->tunnelGateway, remoteLease->tunnelID,
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garlic
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});
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outboundTunnel->SendTunnelDataMsgs (msgs);
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return true;
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}
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else
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{
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if (outboundTunnel)
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LogPrint (eLogWarning, "I2CP: Failed to send message. All leases expired");
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else
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LogPrint (eLogWarning, "I2CP: Failed to send message. No outbound tunnels");
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return false;
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}
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}
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RunnableI2CPDestination::RunnableI2CPDestination (std::shared_ptr<I2CPSession> owner,
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std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic, const std::map<std::string, std::string>& params):
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RunnableService ("I2CP"),
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I2CPDestination (GetIOService (), owner, identity, isPublic, params)
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{
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}
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RunnableI2CPDestination::~RunnableI2CPDestination ()
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{
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if (IsRunning ())
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Stop ();
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}
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void RunnableI2CPDestination::Start ()
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{
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if (!IsRunning ())
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{
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I2CPDestination::Start ();
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StartIOService ();
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}
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}
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void RunnableI2CPDestination::Stop ()
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{
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if (IsRunning ())
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{
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I2CPDestination::Stop ();
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StopIOService ();
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}
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}
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I2CPSession::I2CPSession (I2CPServer& owner, std::shared_ptr<boost::asio::ip::tcp::socket> socket):
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m_Owner (owner), m_Socket (socket), m_SessionID (0xFFFF),
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m_MessageID (0), m_IsSendAccepted (true), m_IsSending (false)
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{
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}
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I2CPSession::~I2CPSession ()
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{
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Terminate ();
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}
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void I2CPSession::Start ()
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{
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ReadProtocolByte ();
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}
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void I2CPSession::Stop ()
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{
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Terminate ();
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}
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void I2CPSession::ReadProtocolByte ()
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{
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if (m_Socket)
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{
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auto s = shared_from_this ();
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m_Socket->async_read_some (boost::asio::buffer (m_Header, 1),
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[s](const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (!ecode && bytes_transferred > 0 && s->m_Header[0] == I2CP_PROTOCOL_BYTE)
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s->ReceiveHeader ();
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else
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s->Terminate ();
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});
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}
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}
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void I2CPSession::ReceiveHeader ()
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{
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if (!m_Socket)
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{
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LogPrint (eLogError, "I2CP: Can't receive header");
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return;
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}
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boost::asio::async_read (*m_Socket, boost::asio::buffer (m_Header, I2CP_HEADER_SIZE),
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boost::asio::transfer_all (),
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std::bind (&I2CPSession::HandleReceivedHeader, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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void I2CPSession::HandleReceivedHeader (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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Terminate ();
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else
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{
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m_PayloadLen = bufbe32toh (m_Header + I2CP_HEADER_LENGTH_OFFSET);
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if (m_PayloadLen > 0)
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{
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if (m_PayloadLen <= I2CP_MAX_MESSAGE_LENGTH)
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ReceivePayload ();
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else
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{
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LogPrint (eLogError, "I2CP: Unexpected payload length ", m_PayloadLen);
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Terminate ();
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}
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}
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else // no following payload
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{
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HandleMessage ();
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ReceiveHeader (); // next message
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}
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}
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}
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void I2CPSession::ReceivePayload ()
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{
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if (!m_Socket)
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{
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LogPrint (eLogError, "I2CP: Can't receive payload");
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return;
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}
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boost::asio::async_read (*m_Socket, boost::asio::buffer (m_Payload, m_PayloadLen),
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boost::asio::transfer_all (),
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std::bind (&I2CPSession::HandleReceivedPayload, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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void I2CPSession::HandleReceivedPayload (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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Terminate ();
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else
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{
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HandleMessage ();
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m_PayloadLen = 0;
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ReceiveHeader (); // next message
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}
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}
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void I2CPSession::HandleMessage ()
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{
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auto handler = m_Owner.GetMessagesHandlers ()[m_Header[I2CP_HEADER_TYPE_OFFSET]];
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if (handler)
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(this->*handler)(m_Payload, m_PayloadLen);
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else
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LogPrint (eLogError, "I2CP: Unknown I2CP message ", (int)m_Header[I2CP_HEADER_TYPE_OFFSET]);
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}
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void I2CPSession::Terminate ()
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{
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if (m_Destination)
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{
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m_Destination->Stop ();
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m_Destination = nullptr;
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}
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if (m_Socket)
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{
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m_Socket->close ();
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m_Socket = nullptr;
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}
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if (!m_SendQueue.IsEmpty ())
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m_SendQueue.CleanUp ();
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if (m_SessionID != 0xFFFF)
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{
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m_Owner.RemoveSession (GetSessionID ());
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LogPrint (eLogDebug, "I2CP: Session ", m_SessionID, " terminated");
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m_SessionID = 0xFFFF;
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}
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}
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void I2CPSession::SendI2CPMessage (uint8_t type, const uint8_t * payload, size_t len)
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{
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auto l = len + I2CP_HEADER_SIZE;
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if (l > I2CP_MAX_MESSAGE_LENGTH)
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{
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LogPrint (eLogError, "I2CP: Message to send is too long ", l);
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return;
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}
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auto sendBuf = m_IsSending ? std::make_shared<i2p::stream::SendBuffer> (l) : nullptr;
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uint8_t * buf = sendBuf ? sendBuf->buf : m_SendBuffer;
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htobe32buf (buf + I2CP_HEADER_LENGTH_OFFSET, len);
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buf[I2CP_HEADER_TYPE_OFFSET] = type;
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memcpy (buf + I2CP_HEADER_SIZE, payload, len);
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if (sendBuf)
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{
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if (m_SendQueue.GetSize () < I2CP_MAX_SEND_QUEUE_SIZE)
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m_SendQueue.Add (sendBuf);
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else
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{
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LogPrint (eLogWarning, "I2CP: Send queue size exceeds ", I2CP_MAX_SEND_QUEUE_SIZE);
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return;
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}
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}
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else
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{
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auto socket = m_Socket;
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if (socket)
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{
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m_IsSending = true;
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boost::asio::async_write (*socket, boost::asio::buffer (m_SendBuffer, l),
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boost::asio::transfer_all (), std::bind(&I2CPSession::HandleI2CPMessageSent,
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shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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}
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}
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void I2CPSession::HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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if (ecode != boost::asio::error::operation_aborted)
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Terminate ();
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}
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else if (!m_SendQueue.IsEmpty ())
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{
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auto socket = m_Socket;
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if (socket)
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{
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auto len = m_SendQueue.Get (m_SendBuffer, I2CP_MAX_MESSAGE_LENGTH);
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boost::asio::async_write (*socket, boost::asio::buffer (m_SendBuffer, len),
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boost::asio::transfer_all (),std::bind(&I2CPSession::HandleI2CPMessageSent,
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shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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else
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m_IsSending = false;
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}
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else
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m_IsSending = false;
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}
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std::string I2CPSession::ExtractString (const uint8_t * buf, size_t len)
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{
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uint8_t l = buf[0];
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if (l > len) l = len;
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return std::string ((const char *)(buf + 1), l);
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}
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size_t I2CPSession::PutString (uint8_t * buf, size_t len, const std::string& str)
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{
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auto l = str.length ();
|
|
if (l + 1 >= len) l = len - 1;
|
|
if (l > 255) l = 255; // 1 byte max
|
|
buf[0] = l;
|
|
memcpy (buf + 1, str.c_str (), l);
|
|
return l + 1;
|
|
}
|
|
|
|
void I2CPSession::ExtractMapping (const uint8_t * buf, size_t len, std::map<std::string, std::string>& mapping)
|
|
// TODO: move to Base.cpp
|
|
{
|
|
size_t offset = 0;
|
|
while (offset < len)
|
|
{
|
|
std::string param = ExtractString (buf + offset, len - offset);
|
|
offset += param.length () + 1;
|
|
if (buf[offset] != '=')
|
|
{
|
|
LogPrint (eLogWarning, "I2CP: Unexpected character ", buf[offset], " instead '=' after ", param);
|
|
break;
|
|
}
|
|
offset++;
|
|
|
|
std::string value = ExtractString (buf + offset, len - offset);
|
|
offset += value.length () + 1;
|
|
if (buf[offset] != ';')
|
|
{
|
|
LogPrint (eLogWarning, "I2CP: Unexpected character ", buf[offset], " instead ';' after ", value);
|
|
break;
|
|
}
|
|
offset++;
|
|
mapping.insert (std::make_pair (param, value));
|
|
}
|
|
}
|
|
|
|
void I2CPSession::GetDateMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
// get version
|
|
auto version = ExtractString (buf, len);
|
|
auto l = version.length () + 1 + 8;
|
|
uint8_t * payload = new uint8_t[l];
|
|
// set date
|
|
auto ts = i2p::util::GetMillisecondsSinceEpoch ();
|
|
htobe64buf (payload, ts);
|
|
// echo vesrion back
|
|
PutString (payload + 8, l - 8, version);
|
|
SendI2CPMessage (I2CP_SET_DATE_MESSAGE, payload, l);
|
|
delete[] payload;
|
|
}
|
|
|
|
void I2CPSession::CreateSessionMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
RAND_bytes ((uint8_t *)&m_SessionID, 2);
|
|
auto identity = std::make_shared<i2p::data::IdentityEx>();
|
|
size_t offset = identity->FromBuffer (buf, len);
|
|
if (!offset)
|
|
{
|
|
LogPrint (eLogError, "I2CP: Create session malformed identity");
|
|
SendSessionStatusMessage (eI2CPSessionStatusInvalid); // invalid
|
|
return;
|
|
}
|
|
if (m_Owner.FindSessionByIdentHash (identity->GetIdentHash ()))
|
|
{
|
|
LogPrint (eLogError, "I2CP: Create session duplicate address ", identity->GetIdentHash ().ToBase32 ());
|
|
SendSessionStatusMessage (eI2CPSessionStatusInvalid); // invalid
|
|
return;
|
|
}
|
|
uint16_t optionsSize = bufbe16toh (buf + offset);
|
|
offset += 2;
|
|
if (optionsSize > len - offset)
|
|
{
|
|
LogPrint (eLogError, "I2CP: Options size ", optionsSize, "exceeds message size");
|
|
SendSessionStatusMessage (eI2CPSessionStatusInvalid); // invalid
|
|
return;
|
|
}
|
|
std::map<std::string, std::string> params;
|
|
ExtractMapping (buf + offset, optionsSize, params);
|
|
offset += optionsSize; // options
|
|
if (params[I2CP_PARAM_MESSAGE_RELIABILITY] == "none") m_IsSendAccepted = false;
|
|
|
|
offset += 8; // date
|
|
if (identity->Verify (buf, offset, buf + offset)) // signature
|
|
{
|
|
if (!m_Destination)
|
|
{
|
|
m_Destination = m_Owner.IsSingleThread () ?
|
|
std::make_shared<I2CPDestination>(m_Owner.GetService (), shared_from_this (), identity, true, params):
|
|
std::make_shared<RunnableI2CPDestination>(shared_from_this (), identity, true, params);
|
|
if (m_Owner.InsertSession (shared_from_this ()))
|
|
{
|
|
SendSessionStatusMessage (eI2CPSessionStatusCreated); // created
|
|
LogPrint (eLogDebug, "I2CP: Session ", m_SessionID, " created");
|
|
m_Destination->Start ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogError, "I2CP: Session already exists");
|
|
SendSessionStatusMessage (eI2CPSessionStatusRefused);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogError, "I2CP: Session already exists");
|
|
SendSessionStatusMessage (eI2CPSessionStatusRefused); // refused
|
|
}
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogError, "I2CP: Create session signature verification failed");
|
|
SendSessionStatusMessage (eI2CPSessionStatusInvalid); // invalid
|
|
}
|
|
}
|
|
|
|
void I2CPSession::DestroySessionMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
SendSessionStatusMessage (eI2CPSessionStatusDestroyed); // destroy
|
|
LogPrint (eLogDebug, "I2CP: Session ", m_SessionID, " destroyed");
|
|
Terminate ();
|
|
}
|
|
|
|
void I2CPSession::ReconfigureSessionMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
I2CPSessionStatus status = eI2CPSessionStatusInvalid; // rejected
|
|
if(len > sizeof(uint16_t))
|
|
{
|
|
uint16_t sessionID = bufbe16toh(buf);
|
|
if(sessionID == m_SessionID)
|
|
{
|
|
buf += sizeof(uint16_t);
|
|
const uint8_t * body = buf;
|
|
i2p::data::IdentityEx ident;
|
|
if(ident.FromBuffer(buf, len - sizeof(uint16_t)))
|
|
{
|
|
if (ident == *m_Destination->GetIdentity())
|
|
{
|
|
size_t identsz = ident.GetFullLen();
|
|
buf += identsz;
|
|
uint16_t optssize = bufbe16toh(buf);
|
|
if (optssize <= len - sizeof(uint16_t) - sizeof(uint64_t) - identsz - ident.GetSignatureLen() - sizeof(uint16_t))
|
|
{
|
|
buf += sizeof(uint16_t);
|
|
std::map<std::string, std::string> opts;
|
|
ExtractMapping(buf, optssize, opts);
|
|
buf += optssize;
|
|
//uint64_t date = bufbe64toh(buf);
|
|
buf += sizeof(uint64_t);
|
|
const uint8_t * sig = buf;
|
|
if(ident.Verify(body, len - sizeof(uint16_t) - ident.GetSignatureLen(), sig))
|
|
{
|
|
if(m_Destination->Reconfigure(opts))
|
|
{
|
|
LogPrint(eLogInfo, "I2CP: Reconfigured destination");
|
|
status = eI2CPSessionStatusUpdated; // updated
|
|
}
|
|
else
|
|
LogPrint(eLogWarning, "I2CP: Failed to reconfigure destination");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Invalid reconfigure message signature");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Mapping size mismatch");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Destination mismatch");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Malfromed destination");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Session mismatch");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Short message");
|
|
SendSessionStatusMessage (status);
|
|
}
|
|
|
|
void I2CPSession::SendSessionStatusMessage (I2CPSessionStatus status)
|
|
{
|
|
uint8_t buf[3];
|
|
htobe16buf (buf, m_SessionID);
|
|
buf[2] = (uint8_t)status;
|
|
SendI2CPMessage (I2CP_SESSION_STATUS_MESSAGE, buf, 3);
|
|
}
|
|
|
|
void I2CPSession::SendMessageStatusMessage (uint32_t nonce, I2CPMessageStatus status)
|
|
{
|
|
if (!nonce) return; // don't send status with zero nonce
|
|
uint8_t buf[15];
|
|
htobe16buf (buf, m_SessionID);
|
|
htobe32buf (buf + 2, m_MessageID++);
|
|
buf[6] = (uint8_t)status;
|
|
memset (buf + 7, 0, 4); // size
|
|
htobe32buf (buf + 11, nonce);
|
|
SendI2CPMessage (I2CP_MESSAGE_STATUS_MESSAGE, buf, 15);
|
|
}
|
|
|
|
void I2CPSession::CreateLeaseSetMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
uint16_t sessionID = bufbe16toh (buf);
|
|
if (sessionID == m_SessionID)
|
|
{
|
|
size_t offset = 2;
|
|
if (m_Destination)
|
|
{
|
|
offset += i2p::crypto::DSA_PRIVATE_KEY_LENGTH; // skip signing private key
|
|
// we always assume this field as 20 bytes (DSA) regardless actual size
|
|
// instead of
|
|
//offset += m_Destination->GetIdentity ()->GetSigningPrivateKeyLen ();
|
|
m_Destination->SetEncryptionPrivateKey (buf + offset);
|
|
offset += 256;
|
|
m_Destination->LeaseSetCreated (buf + offset, len - offset);
|
|
}
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Unexpected sessionID ", sessionID);
|
|
}
|
|
|
|
void I2CPSession::CreateLeaseSet2MessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
uint16_t sessionID = bufbe16toh (buf);
|
|
if (sessionID == m_SessionID)
|
|
{
|
|
size_t offset = 2;
|
|
if (m_Destination)
|
|
{
|
|
uint8_t storeType = buf[offset]; offset++; // store type
|
|
i2p::data::LeaseSet2 ls (storeType, buf + offset, len - offset); // outer layer only for encrypted
|
|
if (!ls.IsValid ())
|
|
{
|
|
LogPrint (eLogError, "I2CP: Invalid LeaseSet2 of type ", storeType);
|
|
return;
|
|
}
|
|
offset += ls.GetBufferLen ();
|
|
// private keys
|
|
int numPrivateKeys = buf[offset]; offset++;
|
|
for (int i = 0; i < numPrivateKeys; i++)
|
|
{
|
|
if (offset + 4 > len) return;
|
|
uint16_t keyType = bufbe16toh (buf + offset); offset += 2; // encryption type
|
|
uint16_t keyLen = bufbe16toh (buf + offset); offset += 2; // private key length
|
|
if (offset + keyLen > len) return;
|
|
if (keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
|
|
m_Destination->SetECIESx25519EncryptionPrivateKey (buf + offset);
|
|
else
|
|
{
|
|
m_Destination->SetEncryptionType (keyType);
|
|
m_Destination->SetEncryptionPrivateKey (buf + offset);
|
|
}
|
|
offset += keyLen;
|
|
}
|
|
|
|
m_Destination->LeaseSet2Created (storeType, ls.GetBuffer (), ls.GetBufferLen ());
|
|
}
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Unexpected sessionID ", sessionID);
|
|
}
|
|
|
|
void I2CPSession::SendMessageMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
uint16_t sessionID = bufbe16toh (buf);
|
|
if (sessionID == m_SessionID)
|
|
{
|
|
size_t offset = 2;
|
|
if (m_Destination)
|
|
{
|
|
i2p::data::IdentityEx identity;
|
|
size_t identsize = identity.FromBuffer (buf + offset, len - offset);
|
|
if (identsize)
|
|
{
|
|
offset += identsize;
|
|
uint32_t payloadLen = bufbe32toh (buf + offset);
|
|
if (payloadLen + offset <= len)
|
|
{
|
|
offset += 4;
|
|
uint32_t nonce = bufbe32toh (buf + offset + payloadLen);
|
|
if (m_IsSendAccepted)
|
|
SendMessageStatusMessage (nonce, eI2CPMessageStatusAccepted); // accepted
|
|
m_Destination->SendMsgTo (buf + offset, payloadLen, identity.GetIdentHash (), nonce);
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Cannot send message, too big");
|
|
}
|
|
else
|
|
LogPrint(eLogError, "I2CP: Invalid identity");
|
|
}
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Unexpected sessionID ", sessionID);
|
|
}
|
|
|
|
void I2CPSession::SendMessageExpiresMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
SendMessageMessageHandler (buf, len - 8); // ignore flags(2) and expiration(6)
|
|
}
|
|
|
|
void I2CPSession::HostLookupMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
uint16_t sessionID = bufbe16toh (buf);
|
|
if (sessionID == m_SessionID || sessionID == 0xFFFF) // -1 means without session
|
|
{
|
|
uint32_t requestID = bufbe32toh (buf + 2);
|
|
//uint32_t timeout = bufbe32toh (buf + 6);
|
|
i2p::data::IdentHash ident;
|
|
switch (buf[10])
|
|
{
|
|
case 0: // hash
|
|
ident = i2p::data::IdentHash (buf + 11);
|
|
break;
|
|
case 1: // address
|
|
{
|
|
auto name = ExtractString (buf + 11, len - 11);
|
|
auto addr = i2p::client::context.GetAddressBook ().GetAddress (name);
|
|
if (!addr || !addr->IsIdentHash ())
|
|
{
|
|
// TODO: handle blinded addresses
|
|
LogPrint (eLogError, "I2CP: Address ", name, " not found");
|
|
SendHostReplyMessage (requestID, nullptr);
|
|
return;
|
|
}
|
|
else
|
|
ident = addr->identHash;
|
|
break;
|
|
}
|
|
default:
|
|
LogPrint (eLogError, "I2CP: Request type ", (int)buf[10], " is not supported");
|
|
SendHostReplyMessage (requestID, nullptr);
|
|
return;
|
|
}
|
|
|
|
std::shared_ptr<LeaseSetDestination> destination = m_Destination;
|
|
if(!destination) destination = i2p::client::context.GetSharedLocalDestination ();
|
|
if (destination)
|
|
{
|
|
auto ls = destination->FindLeaseSet (ident);
|
|
if (ls)
|
|
SendHostReplyMessage (requestID, ls->GetIdentity ());
|
|
else
|
|
{
|
|
auto s = shared_from_this ();
|
|
destination->RequestDestination (ident,
|
|
[s, requestID](std::shared_ptr<i2p::data::LeaseSet> leaseSet)
|
|
{
|
|
s->SendHostReplyMessage (requestID, leaseSet ? leaseSet->GetIdentity () : nullptr);
|
|
});
|
|
}
|
|
}
|
|
else
|
|
SendHostReplyMessage (requestID, nullptr);
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Unexpected sessionID ", sessionID);
|
|
}
|
|
|
|
void I2CPSession::SendHostReplyMessage (uint32_t requestID, std::shared_ptr<const i2p::data::IdentityEx> identity)
|
|
{
|
|
if (identity)
|
|
{
|
|
size_t l = identity->GetFullLen () + 7;
|
|
uint8_t * buf = new uint8_t[l];
|
|
htobe16buf (buf, m_SessionID);
|
|
htobe32buf (buf + 2, requestID);
|
|
buf[6] = 0; // result code
|
|
identity->ToBuffer (buf + 7, l - 7);
|
|
SendI2CPMessage (I2CP_HOST_REPLY_MESSAGE, buf, l);
|
|
delete[] buf;
|
|
}
|
|
else
|
|
{
|
|
uint8_t buf[7];
|
|
htobe16buf (buf, m_SessionID);
|
|
htobe32buf (buf + 2, requestID);
|
|
buf[6] = 1; // result code
|
|
SendI2CPMessage (I2CP_HOST_REPLY_MESSAGE, buf, 7);
|
|
}
|
|
}
|
|
|
|
void I2CPSession::DestLookupMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
if (m_Destination)
|
|
{
|
|
auto ls = m_Destination->FindLeaseSet (buf);
|
|
if (ls)
|
|
{
|
|
auto l = ls->GetIdentity ()->GetFullLen ();
|
|
uint8_t * identBuf = new uint8_t[l];
|
|
ls->GetIdentity ()->ToBuffer (identBuf, l);
|
|
SendI2CPMessage (I2CP_DEST_REPLY_MESSAGE, identBuf, l);
|
|
delete[] identBuf;
|
|
}
|
|
else
|
|
{
|
|
auto s = shared_from_this ();
|
|
i2p::data::IdentHash ident (buf);
|
|
m_Destination->RequestDestination (ident,
|
|
[s, ident](std::shared_ptr<i2p::data::LeaseSet> leaseSet)
|
|
{
|
|
if (leaseSet) // found
|
|
{
|
|
auto l = leaseSet->GetIdentity ()->GetFullLen ();
|
|
uint8_t * identBuf = new uint8_t[l];
|
|
leaseSet->GetIdentity ()->ToBuffer (identBuf, l);
|
|
s->SendI2CPMessage (I2CP_DEST_REPLY_MESSAGE, identBuf, l);
|
|
delete[] identBuf;
|
|
}
|
|
else
|
|
s->SendI2CPMessage (I2CP_DEST_REPLY_MESSAGE, ident, 32); // not found
|
|
});
|
|
}
|
|
}
|
|
else
|
|
SendI2CPMessage (I2CP_DEST_REPLY_MESSAGE, buf, 32);
|
|
}
|
|
|
|
void I2CPSession::GetBandwidthLimitsMessageHandler (const uint8_t * buf, size_t len)
|
|
{
|
|
uint8_t limits[64];
|
|
memset (limits, 0, 64);
|
|
htobe32buf (limits, i2p::transport::transports.GetInBandwidth ()); // inbound
|
|
htobe32buf (limits + 4, i2p::transport::transports.GetOutBandwidth ()); // outbound
|
|
SendI2CPMessage (I2CP_BANDWIDTH_LIMITS_MESSAGE, limits, 64);
|
|
}
|
|
|
|
void I2CPSession::SendMessagePayloadMessage (const uint8_t * payload, size_t len)
|
|
{
|
|
// we don't use SendI2CPMessage to eliminate additional copy
|
|
auto l = len + 10 + I2CP_HEADER_SIZE;
|
|
if (l > I2CP_MAX_MESSAGE_LENGTH)
|
|
{
|
|
LogPrint (eLogError, "I2CP: Message to send is too long ", l);
|
|
return;
|
|
}
|
|
auto sendBuf = m_IsSending ? std::make_shared<i2p::stream::SendBuffer> (l) : nullptr;
|
|
uint8_t * buf = sendBuf ? sendBuf->buf : m_SendBuffer;
|
|
htobe32buf (buf + I2CP_HEADER_LENGTH_OFFSET, len + 10);
|
|
buf[I2CP_HEADER_TYPE_OFFSET] = I2CP_MESSAGE_PAYLOAD_MESSAGE;
|
|
htobe16buf (buf + I2CP_HEADER_SIZE, m_SessionID);
|
|
htobe32buf (buf + I2CP_HEADER_SIZE + 2, m_MessageID++);
|
|
htobe32buf (buf + I2CP_HEADER_SIZE + 6, len);
|
|
memcpy (buf + I2CP_HEADER_SIZE + 10, payload, len);
|
|
if (sendBuf)
|
|
{
|
|
if (m_SendQueue.GetSize () < I2CP_MAX_SEND_QUEUE_SIZE)
|
|
m_SendQueue.Add (sendBuf);
|
|
else
|
|
{
|
|
LogPrint (eLogWarning, "I2CP: Send queue size exceeds ", I2CP_MAX_SEND_QUEUE_SIZE);
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
auto socket = m_Socket;
|
|
if (socket)
|
|
{
|
|
m_IsSending = true;
|
|
boost::asio::async_write (*socket, boost::asio::buffer (m_SendBuffer, l),
|
|
boost::asio::transfer_all (), std::bind(&I2CPSession::HandleI2CPMessageSent,
|
|
shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
}
|
|
}
|
|
|
|
I2CPServer::I2CPServer (const std::string& interface, uint16_t port, bool isSingleThread):
|
|
RunnableService ("I2CP"), m_IsSingleThread (isSingleThread),
|
|
m_Acceptor (GetIOService (),
|
|
boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(interface), port))
|
|
{
|
|
memset (m_MessagesHandlers, 0, sizeof (m_MessagesHandlers));
|
|
m_MessagesHandlers[I2CP_GET_DATE_MESSAGE] = &I2CPSession::GetDateMessageHandler;
|
|
m_MessagesHandlers[I2CP_CREATE_SESSION_MESSAGE] = &I2CPSession::CreateSessionMessageHandler;
|
|
m_MessagesHandlers[I2CP_DESTROY_SESSION_MESSAGE] = &I2CPSession::DestroySessionMessageHandler;
|
|
m_MessagesHandlers[I2CP_RECONFIGURE_SESSION_MESSAGE] = &I2CPSession::ReconfigureSessionMessageHandler;
|
|
m_MessagesHandlers[I2CP_CREATE_LEASESET_MESSAGE] = &I2CPSession::CreateLeaseSetMessageHandler;
|
|
m_MessagesHandlers[I2CP_CREATE_LEASESET2_MESSAGE] = &I2CPSession::CreateLeaseSet2MessageHandler;
|
|
m_MessagesHandlers[I2CP_SEND_MESSAGE_MESSAGE] = &I2CPSession::SendMessageMessageHandler;
|
|
m_MessagesHandlers[I2CP_SEND_MESSAGE_EXPIRES_MESSAGE] = &I2CPSession::SendMessageExpiresMessageHandler;
|
|
m_MessagesHandlers[I2CP_HOST_LOOKUP_MESSAGE] = &I2CPSession::HostLookupMessageHandler;
|
|
m_MessagesHandlers[I2CP_DEST_LOOKUP_MESSAGE] = &I2CPSession::DestLookupMessageHandler;
|
|
m_MessagesHandlers[I2CP_GET_BANDWIDTH_LIMITS_MESSAGE] = &I2CPSession::GetBandwidthLimitsMessageHandler;
|
|
}
|
|
|
|
I2CPServer::~I2CPServer ()
|
|
{
|
|
if (IsRunning ())
|
|
Stop ();
|
|
}
|
|
|
|
void I2CPServer::Start ()
|
|
{
|
|
Accept ();
|
|
StartIOService ();
|
|
}
|
|
|
|
void I2CPServer::Stop ()
|
|
{
|
|
m_Acceptor.cancel ();
|
|
{
|
|
auto sessions = m_Sessions;
|
|
for (auto& it: sessions)
|
|
it.second->Stop ();
|
|
}
|
|
m_Sessions.clear ();
|
|
StopIOService ();
|
|
}
|
|
|
|
void I2CPServer::Accept ()
|
|
{
|
|
auto newSocket = std::make_shared<boost::asio::ip::tcp::socket> (GetIOService ());
|
|
m_Acceptor.async_accept (*newSocket, std::bind (&I2CPServer::HandleAccept, this,
|
|
std::placeholders::_1, newSocket));
|
|
}
|
|
|
|
void I2CPServer::HandleAccept(const boost::system::error_code& ecode,
|
|
std::shared_ptr<boost::asio::ip::tcp::socket> socket)
|
|
{
|
|
if (!ecode && socket)
|
|
{
|
|
boost::system::error_code ec;
|
|
auto ep = socket->remote_endpoint (ec);
|
|
if (!ec)
|
|
{
|
|
LogPrint (eLogDebug, "I2CP: New connection from ", ep);
|
|
auto session = std::make_shared<I2CPSession>(*this, socket);
|
|
session->Start ();
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Incoming connection error ", ec.message ());
|
|
}
|
|
else
|
|
LogPrint (eLogError, "I2CP: Accept error: ", ecode.message ());
|
|
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Accept ();
|
|
}
|
|
|
|
bool I2CPServer::InsertSession (std::shared_ptr<I2CPSession> session)
|
|
{
|
|
if (!session) return false;
|
|
if (!m_Sessions.insert({session->GetSessionID (), session}).second)
|
|
{
|
|
LogPrint (eLogError, "I2CP: Duplicate session id ", session->GetSessionID ());
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void I2CPServer::RemoveSession (uint16_t sessionID)
|
|
{
|
|
m_Sessions.erase (sessionID);
|
|
}
|
|
|
|
std::shared_ptr<I2CPSession> I2CPServer::FindSessionByIdentHash (const i2p::data::IdentHash& ident) const
|
|
{
|
|
for (const auto& it: m_Sessions)
|
|
{
|
|
if (it.second)
|
|
{
|
|
auto dest = it.second->GetDestination ();
|
|
if (dest && dest->GetIdentHash () == ident)
|
|
return it.second;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
}
|
|
}
|