i2pd/client/BOB.cpp

#include <string.h>
#include <boost/lexical_cast.hpp>
#include "util/Log.h"
#include "ClientContext.h"
#include "BOB.h"

namespace i2p
{
namespace client
{
    BOBI2PInboundTunnel::BOBI2PInboundTunnel (int port, std::shared_ptr<ClientDestination> localDestination): 
        BOBI2PTunnel (localDestination), 
        m_Acceptor (localDestination->GetService (), boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port))
    {
    }

    BOBI2PInboundTunnel::~BOBI2PInboundTunnel ()
    {
        Stop ();
    }

    void BOBI2PInboundTunnel::Start ()
    {
        m_Acceptor.listen ();
        Accept ();
    }

    void BOBI2PInboundTunnel::Stop ()
    {
        m_Acceptor.close();
        ClearHandlers ();
    }

    void BOBI2PInboundTunnel::Accept ()
    {
        auto receiver = std::make_shared<AddressReceiver> ();
        receiver->socket = std::make_shared<boost::asio::ip::tcp::socket> (GetService ());
        m_Acceptor.async_accept (*receiver->socket, std::bind (&BOBI2PInboundTunnel::HandleAccept, this,
            std::placeholders::_1, receiver));
    }   

    void BOBI2PInboundTunnel::HandleAccept (const boost::system::error_code& ecode, std::shared_ptr<AddressReceiver> receiver)
    {
        if (!ecode)
        {
            Accept ();  
            ReceiveAddress (receiver);
        }
    }

    void BOBI2PInboundTunnel::ReceiveAddress (std::shared_ptr<AddressReceiver> receiver)
    {
        receiver->socket->async_read_some (boost::asio::buffer(
                receiver->buffer + receiver->bufferOffset, 
                BOB_COMMAND_BUFFER_SIZE - receiver->bufferOffset),                
            std::bind(&BOBI2PInboundTunnel::HandleReceivedAddress, this, 
                std::placeholders::_1, std::placeholders::_2, receiver));
    }
    
    void BOBI2PInboundTunnel::HandleReceivedAddress (const boost::system::error_code& ecode, std::size_t bytes_transferred,
        std::shared_ptr<AddressReceiver> receiver)
    {
        if (ecode)
            LogPrint ("BOB inbound tunnel read error: ", ecode.message ());
        else
        {
            receiver->bufferOffset += bytes_transferred;
            receiver->buffer[receiver->bufferOffset] = 0;
            char * eol = strchr (receiver->buffer, '\n');
            if (eol)
            {
                *eol = 0;
                
                receiver->data = (uint8_t *)eol + 1;
                receiver->dataLen = receiver->bufferOffset - (eol - receiver->buffer + 1);
                i2p::data::IdentHash ident;
                if (!context.GetAddressBook ().GetIdentHash (receiver->buffer, ident)) 
                {
                    LogPrint (eLogError, "BOB address ", receiver->buffer, " not found");
                    return;
                }
                auto leaseSet = GetLocalDestination ()->FindLeaseSet (ident);
                if (leaseSet)
                    CreateConnection (receiver, leaseSet);
                else
                    GetLocalDestination ()->RequestDestination (ident, 
                        std::bind (&BOBI2PInboundTunnel::HandleDestinationRequestComplete,
                        this, std::placeholders::_1, receiver));
            }
            else
            {
                if (receiver->bufferOffset < BOB_COMMAND_BUFFER_SIZE)
                    ReceiveAddress (receiver);
                else
                    LogPrint ("BOB missing inbound address ");
            }           
        }
    }

    void BOBI2PInboundTunnel::HandleDestinationRequestComplete (std::shared_ptr<i2p::data::LeaseSet> leaseSet, std::shared_ptr<AddressReceiver> receiver)
    {
        if (leaseSet)
            CreateConnection (receiver, leaseSet);
        else
            LogPrint ("LeaseSet for BOB inbound destination not found");
    }   

    void BOBI2PInboundTunnel::CreateConnection (std::shared_ptr<AddressReceiver> receiver, std::shared_ptr<const i2p::data::LeaseSet> leaseSet)
    {
        LogPrint ("New BOB inbound connection");
        auto connection = std::make_shared<I2PTunnelConnection>(this, receiver->socket, leaseSet);
        AddHandler (connection);
        connection->I2PConnect (receiver->data, receiver->dataLen);
    }

    BOBI2POutboundTunnel::BOBI2POutboundTunnel (const std::string& address, int port, 
        std::shared_ptr<ClientDestination> localDestination, bool quiet): BOBI2PTunnel (localDestination),
        m_Endpoint (boost::asio::ip::address::from_string (address), port), m_IsQuiet (quiet)
    {
    }
    
    void BOBI2POutboundTunnel::Start ()
    {
        Accept ();
    }

    void BOBI2POutboundTunnel::Stop ()
    {
        ClearHandlers ();
    }   

    void BOBI2POutboundTunnel::Accept ()
    {
        auto localDestination = GetLocalDestination (); 
        if (localDestination)
            localDestination->AcceptStreams (std::bind (&BOBI2POutboundTunnel::HandleAccept, this, std::placeholders::_1));
        else
            LogPrint ("Local destination not set for server tunnel");
    }

    void BOBI2POutboundTunnel::HandleAccept (std::shared_ptr<i2p::stream::Stream> stream)
    {
        if (stream)
        {   
            auto conn = std::make_shared<I2PTunnelConnection> (this, stream, std::make_shared<boost::asio::ip::tcp::socket> (GetService ()), m_Endpoint, m_IsQuiet);
            AddHandler (conn);
            conn->Connect ();
        }   
    }

    BOBDestination::BOBDestination (std::shared_ptr<ClientDestination> localDestination):
        m_LocalDestination (localDestination), 
        m_OutboundTunnel (nullptr), m_InboundTunnel (nullptr)
    {
    }
        
    BOBDestination::~BOBDestination ()
    {
        delete m_OutboundTunnel;
        delete m_InboundTunnel;
        i2p::client::context.DeleteLocalDestination (m_LocalDestination);
    }   

    void BOBDestination::Start ()
    {
        if (m_OutboundTunnel) m_OutboundTunnel->Start ();
        if (m_InboundTunnel) m_InboundTunnel->Start ();
    }
        
    void BOBDestination::Stop ()
    {       
        StopTunnels ();
        m_LocalDestination->Stop ();
    }   

    void BOBDestination::StopTunnels ()
    {
        if (m_OutboundTunnel)
        {   
            m_OutboundTunnel->Stop ();
            delete m_OutboundTunnel;
            m_OutboundTunnel = nullptr;
        }   
        if (m_InboundTunnel)
        {   
            m_InboundTunnel->Stop ();
            delete m_InboundTunnel;
            m_InboundTunnel = nullptr;
        }   
    }   
        
    void BOBDestination::CreateInboundTunnel (int port)
    {
        if (!m_InboundTunnel)
            m_InboundTunnel = new BOBI2PInboundTunnel (port, m_LocalDestination);
    }
        
    void BOBDestination::CreateOutboundTunnel (const std::string& address, int port, bool quiet)
    {
        if (!m_OutboundTunnel)
            m_OutboundTunnel = new BOBI2POutboundTunnel (address, port, m_LocalDestination, quiet);
    }   
        
    BOBCommandSession::BOBCommandSession (BOBCommandChannel& owner): 
        m_Owner (owner), m_Socket (m_Owner.GetService ()), m_ReceiveBufferOffset (0),
        m_IsOpen (true), m_IsQuiet (false), m_InPort (0), m_OutPort (0),
        m_CurrentDestination (nullptr)
    {
    }

    BOBCommandSession::~BOBCommandSession ()
    {
    }

    void BOBCommandSession::Terminate ()
    {
        m_Socket.close ();
        m_IsOpen = false;   
    }

    void BOBCommandSession::Receive ()
    {
        m_Socket.async_read_some (boost::asio::buffer(m_ReceiveBuffer + m_ReceiveBufferOffset, BOB_COMMAND_BUFFER_SIZE - m_ReceiveBufferOffset),                
            std::bind(&BOBCommandSession::HandleReceived, shared_from_this (), 
            std::placeholders::_1, std::placeholders::_2));
    }

    void BOBCommandSession::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
    {
        if (ecode)
        {
            LogPrint ("BOB command channel read error: ", ecode.message ());
            if (ecode != boost::asio::error::operation_aborted)
                Terminate ();
        }   
        else
        {   
            size_t size = m_ReceiveBufferOffset + bytes_transferred; 
            m_ReceiveBuffer[size] = 0;
            char * eol = strchr (m_ReceiveBuffer, '\n');
            if (eol)
            {
                *eol = 0;
                char * operand =  strchr (m_ReceiveBuffer, ' ');
                if (operand)  
                {   
                    *operand = 0;
                    operand++;
                }   
                else 
                    operand = eol;
                // process command
                auto& handlers = m_Owner.GetCommandHandlers ();
                auto it = handlers.find (m_ReceiveBuffer);
                if (it != handlers.end ())
                    (this->*(it->second))(operand, eol - operand);
                else    
                {
                    LogPrint (eLogError, "BOB unknown command ", m_ReceiveBuffer);
                    SendReplyError ("unknown command");
                }

                m_ReceiveBufferOffset = size - (eol - m_ReceiveBuffer) - 1;
                memmove (m_ReceiveBuffer, eol + 1, m_ReceiveBufferOffset);
            }
            else
            {
                if (size < BOB_COMMAND_BUFFER_SIZE)
                    m_ReceiveBufferOffset = size;
                else
                {
                    LogPrint (eLogError, "Malformed input of the BOB command channel");
                    Terminate ();
                }
            }   
        }
    }

    void BOBCommandSession::Send (size_t len)
    {
        boost::asio::async_write (m_Socket, boost::asio::buffer (m_SendBuffer, len), 
            boost::asio::transfer_all (),
            std::bind(&BOBCommandSession::HandleSent, shared_from_this (), 
                std::placeholders::_1, std::placeholders::_2));
    }

    void BOBCommandSession::HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
    {
        if (ecode)
        {
            LogPrint ("BOB command channel send error: ", ecode.message ());
            if (ecode != boost::asio::error::operation_aborted)
                Terminate ();
        }
        else
        {
            if (m_IsOpen)
                Receive ();
            else
                Terminate ();   
        }
    }

    void BOBCommandSession::SendReplyOK (const char * msg)
    {
#ifdef _MSC_VER
        size_t len = sprintf_s (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_REPLY_OK, msg);
#else       
        size_t len = snprintf (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_REPLY_OK, msg);
#endif
        Send (len);
    }

    void BOBCommandSession::SendReplyError (const char * msg)
    {
#ifdef _MSC_VER
        size_t len = sprintf_s (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_REPLY_ERROR, msg);
#else       
        size_t len = snprintf (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_REPLY_ERROR, msg);
#endif
        Send (len); 
    }
        
    void BOBCommandSession::SendVersion ()
    {
        size_t len = strlen (BOB_VERSION);
        memcpy (m_SendBuffer, BOB_VERSION, len);
        Send (len);
    }

    void BOBCommandSession::SendData (const char * nickname)
    {
#ifdef _MSC_VER
        size_t len = sprintf_s (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_DATA, nickname);
#else       
        size_t len = snprintf (m_SendBuffer, BOB_COMMAND_BUFFER_SIZE, BOB_DATA, nickname);
#endif
        Send (len);         
    }
        
    void BOBCommandSession::ZapCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: zap");
        Terminate ();
    }

    void BOBCommandSession::QuitCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: quit");
        m_IsOpen = false;
        SendReplyOK ("Bye!");
    }

    void BOBCommandSession::StartCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: start ", m_Nickname);
        if (!m_CurrentDestination)
        {   
            m_CurrentDestination = new BOBDestination (i2p::client::context.CreateNewLocalDestination (m_Keys, true, &m_Options));
            m_Owner.AddDestination (m_Nickname, m_CurrentDestination);
        }   
        if (m_InPort)
            m_CurrentDestination->CreateInboundTunnel (m_InPort);
        if (m_OutPort && !m_Address.empty ())
            m_CurrentDestination->CreateOutboundTunnel (m_Address, m_OutPort, m_IsQuiet);
        m_CurrentDestination->Start (); 
        SendReplyOK ("tunnel starting");    
    }   
    
    void BOBCommandSession::StopCommandHandler (const char * operand, size_t len)
    {
        auto dest = m_Owner.FindDestination (m_Nickname);
        if (dest)
        {
            dest->StopTunnels ();
            SendReplyOK ("tunnel stopping");
        }
        else
            SendReplyError ("tunnel not found");
    }   
    
    void BOBCommandSession::SetNickCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: setnick ", operand);
        m_Nickname = operand;
        std::string msg ("Nickname set to ");
        msg += operand;
        SendReplyOK (msg.c_str ());
    }   

    void BOBCommandSession::GetNickCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: getnick ", operand);
        m_CurrentDestination = m_Owner.FindDestination (operand); 
        if (m_CurrentDestination)
        {
            m_Keys = m_CurrentDestination->GetKeys ();
            m_Nickname = operand;
            std::string msg ("Nickname set to ");
            msg += operand;
            SendReplyOK (msg.c_str ());
        }
        else
            SendReplyError ("tunnel not found");    
    }   

    void BOBCommandSession::NewkeysCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: newkeys");
        m_Keys = i2p::data::PrivateKeys::CreateRandomKeys ();
        SendReplyOK (m_Keys.GetPublic ().ToBase64 ().c_str ());
    }   

    void BOBCommandSession::SetkeysCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: setkeys ", operand);
        m_Keys.FromBase64 (operand);
        SendReplyOK (m_Keys.GetPublic ().ToBase64 ().c_str ());
    }
        
    void BOBCommandSession::GetkeysCommandHandler (const char * operand, size_t len)
    {       
        LogPrint (eLogDebug, "BOB: getkeys");
        SendReplyOK (m_Keys.ToBase64 ().c_str ());
    }   

    void BOBCommandSession::GetdestCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: getdest");
        SendReplyOK (m_Keys.GetPublic ().ToBase64 ().c_str ());
    }   
        
    void BOBCommandSession::OuthostCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: outhost ", operand);
        m_Address = operand;
        SendReplyOK ("outhost set");
    }
        
    void BOBCommandSession::OutportCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: outport ", operand);
        m_OutPort = boost::lexical_cast<int>(operand);
        SendReplyOK ("outbound port set");
    }   

    void BOBCommandSession::InhostCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: inhost ", operand);
        m_Address = operand;
        SendReplyOK ("inhost set");
    }
        
    void BOBCommandSession::InportCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: inport ", operand);
        m_InPort = boost::lexical_cast<int>(operand);
        SendReplyOK ("inbound port set");
    }       

    void BOBCommandSession::QuietCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: quiet");
        m_IsQuiet = true;
        SendReplyOK ("quiet");
    }   
    
    void BOBCommandSession::LookupCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: lookup ", operand);
        i2p::data::IdentHash ident;
        if (!context.GetAddressBook ().GetIdentHash (operand, ident) || !m_CurrentDestination) 
        {
            SendReplyError ("Address Not found");
            return;
        }   
        auto localDestination = m_CurrentDestination->GetLocalDestination ();
        auto leaseSet = localDestination->FindLeaseSet (ident);
        if (leaseSet)
            SendReplyOK (leaseSet->GetIdentity ().ToBase64 ().c_str ());
        else
        {
            auto s = shared_from_this ();
            localDestination->RequestDestination (ident, 
                [s](std::shared_ptr<i2p::data::LeaseSet> ls)
                {
                    if (ls)
                        s->SendReplyOK (ls->GetIdentity ().ToBase64 ().c_str ());
                    else    
                        s->SendReplyError ("LeaseSet Not found");
                }   
            );
        }
    }

    void BOBCommandSession::ClearCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: clear");
        m_Owner.DeleteDestination (m_Nickname);
        SendReplyOK ("cleared");
    }   

    void BOBCommandSession::ListCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: list");
        auto& destinations = m_Owner.GetDestinations ();
        for (auto it: destinations)
            SendData (it.first.c_str ());
        SendReplyOK ("Listing done");
    }   

    void BOBCommandSession::OptionCommandHandler (const char * operand, size_t len)
    {
        LogPrint (eLogDebug, "BOB: option ", operand);
        const char * value = strchr (operand, '=');
        if (value)
        {   
            *(const_cast<char *>(value)) = 0;
            m_Options[operand] = value + 1; 
            *(const_cast<char *>(value)) = '=';
            SendReplyOK ("option");
        }   
        else
            SendReplyError ("malformed");
    }   
        
    BOBCommandChannel::BOBCommandChannel(const std::string& address, int port)
        : m_IsRunning (false), m_Thread (nullptr),
          m_Acceptor(m_Service, boost::asio::ip::tcp::endpoint(
            boost::asio::ip::address::from_string(address), port)
          )
    {
        // command -> handler
        m_CommandHandlers[BOB_COMMAND_ZAP] = &BOBCommandSession::ZapCommandHandler; 
        m_CommandHandlers[BOB_COMMAND_QUIT] = &BOBCommandSession::QuitCommandHandler;
        m_CommandHandlers[BOB_COMMAND_START] = &BOBCommandSession::StartCommandHandler;
        m_CommandHandlers[BOB_COMMAND_STOP] = &BOBCommandSession::StopCommandHandler;
        m_CommandHandlers[BOB_COMMAND_SETNICK] = &BOBCommandSession::SetNickCommandHandler;
        m_CommandHandlers[BOB_COMMAND_GETNICK] = &BOBCommandSession::GetNickCommandHandler;
        m_CommandHandlers[BOB_COMMAND_NEWKEYS] = &BOBCommandSession::NewkeysCommandHandler;
        m_CommandHandlers[BOB_COMMAND_GETKEYS] = &BOBCommandSession::GetkeysCommandHandler;
        m_CommandHandlers[BOB_COMMAND_SETKEYS] = &BOBCommandSession::SetkeysCommandHandler;
        m_CommandHandlers[BOB_COMMAND_GETDEST] = &BOBCommandSession::GetdestCommandHandler;
        m_CommandHandlers[BOB_COMMAND_OUTHOST] = &BOBCommandSession::OuthostCommandHandler;
        m_CommandHandlers[BOB_COMMAND_OUTPORT] = &BOBCommandSession::OutportCommandHandler;
        m_CommandHandlers[BOB_COMMAND_INHOST] = &BOBCommandSession::InhostCommandHandler;
        m_CommandHandlers[BOB_COMMAND_INPORT] = &BOBCommandSession::InportCommandHandler;
        m_CommandHandlers[BOB_COMMAND_QUIET] = &BOBCommandSession::QuietCommandHandler;
        m_CommandHandlers[BOB_COMMAND_LOOKUP] = &BOBCommandSession::LookupCommandHandler;
        m_CommandHandlers[BOB_COMMAND_CLEAR] = &BOBCommandSession::ClearCommandHandler;
        m_CommandHandlers[BOB_COMMAND_LIST] = &BOBCommandSession::ListCommandHandler;
        m_CommandHandlers[BOB_COMMAND_OPTION] = &BOBCommandSession::OptionCommandHandler;
    }

    BOBCommandChannel::~BOBCommandChannel ()
    {
        Stop ();
        for (auto it: m_Destinations)
            delete it.second;
    }

    void BOBCommandChannel::Start ()
    {
        Accept ();
        m_IsRunning = true;
        m_Thread = new std::thread (std::bind (&BOBCommandChannel::Run, this));
    }

    void BOBCommandChannel::Stop ()
    {
        m_IsRunning = false;
        for (auto it: m_Destinations)
            it.second->Stop ();
        m_Acceptor.cancel ();   
        m_Service.stop ();
        if (m_Thread)
        {   
            m_Thread->join (); 
            delete m_Thread;
            m_Thread = nullptr;
        }   
    }
        
    void BOBCommandChannel::Run () 
    { 
        while (m_IsRunning)
        {
            try
            {   
                m_Service.run ();
            }
            catch (std::exception& ex)
            {
                LogPrint (eLogError, "BOB: ", ex.what ());
            }   
        }   
    }

    void BOBCommandChannel::AddDestination (const std::string& name, BOBDestination * dest)
    {
        m_Destinations[name] = dest;
    }   

    void BOBCommandChannel::DeleteDestination (const std::string& name)
    {
        auto it = m_Destinations.find (name);
        if (it != m_Destinations.end ())
        {
            it->second->Stop ();
            delete it->second;
            m_Destinations.erase (it);
        }   
    }   
        
    BOBDestination * BOBCommandChannel::FindDestination (const std::string& name)
    {
        auto it = m_Destinations.find (name);
        if (it != m_Destinations.end ())
            return it->second;
        return nullptr; 
    }
        
    void BOBCommandChannel::Accept ()
    {
        auto newSession = std::make_shared<BOBCommandSession> (*this);
        m_Acceptor.async_accept (newSession->GetSocket (), std::bind (&BOBCommandChannel::HandleAccept, this,
            std::placeholders::_1, newSession));
    }

    void BOBCommandChannel::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<BOBCommandSession> session)
    {
        if (ecode != boost::asio::error::operation_aborted)
            Accept ();

        if (!ecode)
        {
            LogPrint (eLogInfo, "New BOB command connection from ", session->GetSocket ().remote_endpoint ());
            session->SendVersion ();    
        }
        else
            LogPrint (eLogError, "BOB accept error: ",  ecode.message ());
    }
}
}