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368 lines
10 KiB
C++
368 lines
10 KiB
C++
/*
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* Copyright (c) 2013-2016, 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 <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 "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 (I2CPSession& owner, std::shared_ptr<const i2p::data::IdentityEx> identity, bool isPublic):
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LeaseSetDestination (isPublic), m_Owner (owner), m_Identity (identity)
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{
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}
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void I2CPDestination::SetEncryptionPrivateKey (const uint8_t * key)
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{
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memcpy (m_EncryptionPrivateKey, key, 256);
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}
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void I2CPDestination::CreateNewLeaseSet (std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels)
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{
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i2p::data::LocalLeaseSet ls (m_Identity, m_EncryptionPrivateKey, tunnels); // we don't care about encryption key
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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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htobe16buf (leases - 3, m_Owner.GetSessionID ());
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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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}
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void I2CPDestination::LeaseSetCreated (const uint8_t * buf, size_t len)
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{
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auto ls = new 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::SendMsgTo (const uint8_t * payload, size_t len, const i2p::data::IdentHash& ident)
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{
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auto msg = NewI2NPMessage ();
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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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// TODO: send
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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),
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m_NextMessage (nullptr), m_NextMessageLen (0), m_NextMessageOffset (0)
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{
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RAND_bytes ((uint8_t *)&m_SessionID, 2);
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ReadProtocolByte ();
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}
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I2CPSession::~I2CPSession ()
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{
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delete[] m_NextMessage;
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}
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void I2CPSession::Close ()
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{
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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_Buffer, 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_Buffer[0] == I2CP_PRTOCOL_BYTE)
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s->Receive ();
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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::Receive ()
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{
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m_Socket->async_read_some (boost::asio::buffer (m_Buffer, I2CP_SESSION_BUFFER_SIZE),
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std::bind (&I2CPSession::HandleReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
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}
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void I2CPSession::HandleReceived (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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size_t offset = 0;
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if (m_NextMessage)
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{
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if (m_NextMessageOffset + bytes_transferred <= m_NextMessageLen)
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{
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memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer, bytes_transferred);
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m_NextMessageOffset += bytes_transferred;
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}
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else
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{
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offset = m_NextMessageLen - m_NextMessageOffset;
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memcpy (m_NextMessage + m_NextMessageOffset, m_Buffer, offset);
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HandleNextMessage (m_NextMessage);
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delete[] m_NextMessage;
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}
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}
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while (offset < bytes_transferred)
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{
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auto msgLen = bufbe32toh (m_Buffer + offset + I2CP_HEADER_LENGTH_OFFSET) + I2CP_HEADER_SIZE;
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if (msgLen <= bytes_transferred - offset)
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{
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HandleNextMessage (m_Buffer + offset);
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offset += msgLen;
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}
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else
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{
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m_NextMessageLen = msgLen;
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m_NextMessageOffset = bytes_transferred - offset;
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m_NextMessage = new uint8_t[m_NextMessageLen];
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memcpy (m_NextMessage, m_Buffer + offset, m_NextMessageOffset);
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offset = bytes_transferred;
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}
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}
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Receive ();
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}
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}
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void I2CPSession::HandleNextMessage (const uint8_t * buf)
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{
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auto handler = m_Owner.GetMessagesHandlers ()[buf[I2CP_HEADER_TYPE_OFFSET]];
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if (handler)
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(this->*handler)(buf + I2CP_HEADER_SIZE, bufbe32toh (buf + I2CP_HEADER_LENGTH_OFFSET));
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else
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LogPrint (eLogError, "I2CP: Unknown I2CP messsage ", (int)buf[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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m_Owner.RemoveSession (GetSessionID ());
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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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uint8_t * buf = new uint8_t[l];
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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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boost::asio::async_write (*m_Socket, boost::asio::buffer (buf, l), boost::asio::transfer_all (),
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std::bind(&I2CPSession::HandleI2CPMessageSent, shared_from_this (),
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std::placeholders::_1, std::placeholders::_2, buf));
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}
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void I2CPSession::HandleI2CPMessageSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, const uint8_t * buf)
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{
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delete[] buf;
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if (ecode && ecode != boost::asio::error::operation_aborted)
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Terminate ();
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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, 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 ();
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if (l + 1 >= len) l = len - 1;
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if (l > 255) l = 255; // 1 byte max
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buf[0] = l;
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memcpy (buf + 1, str.c_str (), l);
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return l + 1;
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}
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void I2CPSession::GetDateMessageHandler (const uint8_t * buf, size_t len)
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{
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// get version
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auto version = ExtractString (buf, len);
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auto l = version.length () + 1 + 8;
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uint8_t * payload = new uint8_t[l];
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// set date
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auto ts = i2p::util::GetMillisecondsSinceEpoch ();
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htobe64buf (payload, ts);
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// echo vesrion back
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PutString (payload + 8, l - 8, version);
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SendI2CPMessage (I2CP_SET_DATE_MESSAGE, payload, l);
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delete[] payload;
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}
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void I2CPSession::CreateSessionMessageHandler (const uint8_t * buf, size_t len)
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{
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auto identity = std::make_shared<i2p::data::IdentityEx>();
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size_t offset = identity->FromBuffer (buf, len);
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uint16_t optionsSize = bufbe16toh (buf + offset);
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// TODO: extract options
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offset += optionsSize;
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offset += 8; // date
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if (identity->Verify (buf, offset, buf + offset)) // signature
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{
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m_Destination = std::make_shared<I2CPDestination>(*this, identity, false);
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m_Destination->Start ();
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SendSessionStatusMessage (1); // created
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}
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else
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{
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LogPrint (eLogError, "I2CP: create session signature verification falied");
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SendSessionStatusMessage (3); // invalid
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}
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}
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void I2CPSession::SendSessionStatusMessage (uint8_t status)
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{
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uint8_t buf[3];
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htobe16buf (buf, m_SessionID);
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buf[2] = status;
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SendI2CPMessage (I2CP_SESSION_STATUS_MESSAGE, buf, 3);
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}
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void I2CPSession::CreateLeaseSetMessageHandler (const uint8_t * buf, size_t len)
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{
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uint16_t sessionID = bufbe16toh (buf);
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if (sessionID == m_SessionID)
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{
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size_t offset = 2;
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if (m_Destination)
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{
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m_Destination->SetEncryptionPrivateKey (buf + offset);
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offset += 256;
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m_Destination->LeaseSetCreated (buf + offset, len - offset);
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}
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}
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else
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LogPrint (eLogError, "I2CP: unexpected sessionID ", sessionID);
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}
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void I2CPSession::SendMessageMessageHandler (const uint8_t * buf, size_t len)
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{
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uint16_t sessionID = bufbe16toh (buf);
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if (sessionID == m_SessionID)
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{
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size_t offset = 2;
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if (m_Destination)
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{
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i2p::data::IdentityEx identity;
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offset += identity.FromBuffer (buf + offset, len - offset);
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m_Destination->SendMsgTo (buf + offset, len - offset, identity.GetIdentHash ());
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}
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}
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else
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LogPrint (eLogError, "I2CP: unexpected sessionID ", sessionID);
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}
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I2CPServer::I2CPServer (const std::string& interface, int port):
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m_IsRunning (false), m_Thread (nullptr),
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m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(interface), port))
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{
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memset (m_MessagesHandlers, 0, sizeof (m_MessagesHandlers));
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m_MessagesHandlers[I2CP_GET_DATE_MESSAGE] = &I2CPSession::GetDateMessageHandler;
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m_MessagesHandlers[I2CP_CREATE_SESSION_MESSAGE] = &I2CPSession::CreateSessionMessageHandler;
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m_MessagesHandlers[I2CP_CREATE_LEASESET_MESSAGE] = &I2CPSession::CreateLeaseSetMessageHandler;
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m_MessagesHandlers[I2CP_SEND_MESSAGE_MESSAGE] = &I2CPSession::SendMessageMessageHandler;
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}
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I2CPServer::~I2CPServer ()
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{
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if (m_IsRunning)
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Stop ();
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}
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void I2CPServer::Start ()
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{
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Accept ();
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m_IsRunning = true;
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m_Thread = new std::thread (std::bind (&I2CPServer::Run, this));
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}
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void I2CPServer::Stop ()
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{
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m_IsRunning = false;
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m_Acceptor.cancel ();
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for (auto it: m_Sessions)
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it.second->Close ();
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m_Sessions.clear ();
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m_Service.stop ();
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if (m_Thread)
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{
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m_Thread->join ();
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delete m_Thread;
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m_Thread = nullptr;
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}
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}
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void I2CPServer::Run ()
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{
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while (m_IsRunning)
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{
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try
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{
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m_Service.run ();
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}
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catch (std::exception& ex)
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{
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LogPrint (eLogError, "I2CP: runtime exception: ", ex.what ());
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}
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}
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}
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void I2CPServer::Accept ()
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{
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auto newSocket = std::make_shared<boost::asio::ip::tcp::socket> (m_Service);
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m_Acceptor.async_accept (*newSocket, std::bind (&I2CPServer::HandleAccept, this,
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std::placeholders::_1, newSocket));
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}
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void I2CPServer::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket)
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{
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if (!ecode && socket)
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{
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boost::system::error_code ec;
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auto ep = socket->remote_endpoint (ec);
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if (!ec)
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{
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LogPrint (eLogDebug, "I2CP: new connection from ", ep);
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auto session = std::make_shared<I2CPSession>(*this, socket);
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m_Sessions[session->GetSessionID ()] = session;
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}
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else
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LogPrint (eLogError, "I2CP: incoming connection error ", ec.message ());
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}
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else
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LogPrint (eLogError, "I2CP: accept error: ", ecode.message ());
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if (ecode != boost::asio::error::operation_aborted)
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Accept ();
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}
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void I2CPServer::RemoveSession (uint16_t sessionID)
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{
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m_Sessions.erase (sessionID);
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}
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}
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}
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