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external IP detection

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pull/38/head^2
orignal 10 years ago
parent 74e1840bad
commit ec5eafafeb
8 changed files with 106 additions and 9 deletions
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7
RouterContext.cpp
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@ -52,6 +52,13 @@ namespace i2p
m_RouterInfo.CreateBuffer ();
}
void RouterContext::UpdateAddress (const char * host)
{
for (auto& address : m_RouterInfo.GetAddresses ())
address.host = boost::asio::ip::address::from_string (host);
m_RouterInfo.CreateBuffer ();
}
void RouterContext::Sign (uint8_t * buf, int len, uint8_t * signature)
{

1
RouterContext.h
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@ -28,6 +28,7 @@ namespace i2p
void Sign (uint8_t * buf, int len, uint8_t * signature);
void OverrideNTCPAddress (const char * host, int port); // temporary
void UpdateAddress (const char * host); // called from SSU
private:

8
RouterInfo.cpp
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@ -294,6 +294,14 @@ namespace data
else
return m_SupportedTransports & (eNTCPV4 | eNTCPV6);
}
bool RouterInfo::IsSSU (bool v4only) const
{
if (v4only)
return m_SupportedTransports & eSSUV4;
else
return m_SupportedTransports & (eSSUV4 | eSSUV6);
}
RouterInfo::Address * RouterInfo::GetNTCPAddress (bool v4only)
{

3
RouterInfo.h
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@ -53,7 +53,7 @@ namespace data
const char * GetIdentHashBase64 () const { return m_IdentHashBase64; };
const char * GetIdentHashAbbreviation () const { return m_IdentHashAbbreviation; };
uint64_t GetTimestamp () const { return m_Timestamp; };
const std::vector<Address>& GetAddresses () const { return m_Addresses; };
std::vector<Address>& GetAddresses () { return m_Addresses; };
Address * GetNTCPAddress (bool v4only = true);
Address * GetSSUAddress (bool v4only = true);
const RoutingKey& GetRoutingKey () const { return m_RoutingKey; };
@ -63,6 +63,7 @@ namespace data
const char * GetProperty (const char * key) const;
bool IsFloodfill () const;
bool IsNTCP (bool v4only = true) const;
bool IsSSU (bool v4only = true) const;
bool IsCompatible (const RouterInfo& other) const { return m_SupportedTransports & other.m_SupportedTransports; };
void SetUnreachable (bool unreachable) { m_IsUnreachable = unreachable; };

40
SSU.cpp
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@ -85,7 +85,7 @@ namespace ssu
case PAYLOAD_TYPE_TEST:
LogPrint ("SSU test received");
break;
case PAYLOAD_TYPE_SESSION_DESTROY:
case PAYLOAD_TYPE_SESSION_DESTROYED:
LogPrint ("SSU session destroy received");
break;
default:
@ -129,6 +129,7 @@ namespace ssu
boost::asio::ip::address_v4 ourIP (be32toh (*(uint32_t* )(ourAddress)));
uint16_t ourPort = be16toh (*(uint16_t *)(ourAddress + 4));
LogPrint ("Our external address is ", ourIP.to_string (), ":", ourPort);
i2p::context.UpdateAddress (ourIP.to_string ().c_str ());
uint32_t relayTag = be32toh (*(uint32_t *)(buf + sizeof (SSUHeader) + 263));
SendSessionConfirmed (buf + sizeof (SSUHeader), ourAddress, relayTag);
m_State = eSessionStateEstablished;
@ -357,6 +358,11 @@ namespace ssu
SendSessionRequest ();
}
void SSUSession::Close ()
{
SendSesionDestroyed ();
}
void SSUSession::SendI2NPMessage (I2NPMessage * msg)
{
// TODO:
@ -445,7 +451,7 @@ namespace ssu
void SSUSession::SendMsgAck (uint32_t msgID)
{
uint8_t buf[48]; // actual length is 44 = 37 + 7 but pad it to multiple of 16
uint8_t buf[48 + 18]; // actual length is 44 = 37 + 7 but pad it to multiple of 16
uint8_t iv[16];
uint8_t * payload = buf + sizeof (SSUHeader);
*payload = DATA_FLAG_EXPLICIT_ACKS_INCLUDED; // flag
@ -463,6 +469,16 @@ namespace ssu
m_Server->Send (buf, 48, m_RemoteEndpoint);
}
void SSUSession::SendSesionDestroyed ()
{
uint8_t buf[48 + 18], iv[16];
CryptoPP::RandomNumberGenerator& rnd = i2p::context.GetRandomNumberGenerator ();
rnd.GenerateBlock (iv, 16); // random iv
// encrypt message with session key
FillHeaderAndEncrypt (PAYLOAD_TYPE_SESSION_DESTROYED, buf, 48, m_SessionKey, iv, m_MacKey);
m_Server->Send (buf, 48, m_RemoteEndpoint);
}
SSUServer::SSUServer (boost::asio::io_service& service, int port):
m_Endpoint (boost::asio::ip::udp::v4 (), port), m_Socket (service, m_Endpoint)
{
@ -546,6 +562,26 @@ namespace ssu
}
return session;
}
void SSUServer::DeleteSession (SSUSession * session)
{
if (session)
{
session->Close ();
m_Sessions.erase (session->GetRemoteEndpoint ());
delete session;
}
}
void SSUServer::DeleteAllSessions ()
{
for (auto it: m_Sessions)
{
it.second->Close ();
delete it.second;
}
m_Sessions.clear ();
}
}
}

11
SSU.h
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@ -35,7 +35,7 @@ namespace ssu
const uint8_t PAYLOAD_TYPE_RELAY_INTRO = 5;
const uint8_t PAYLOAD_TYPE_DATA = 6;
const uint8_t PAYLOAD_TYPE_TEST = 7;
const uint8_t PAYLOAD_TYPE_SESSION_DESTROY = 8;
const uint8_t PAYLOAD_TYPE_SESSION_DESTROYED = 8;
// data flags
const uint8_t DATA_FLAG_EXTENDED_DATA_INCLUDED = 0x02;
@ -67,6 +67,8 @@ namespace ssu
void ProcessNextMessage (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
void Connect ();
void Close ();
boost::asio::ip::udp::endpoint& GetRemoteEndpoint () { return m_RemoteEndpoint; };
void SendI2NPMessage (I2NPMessage * msg);
private:
@ -82,7 +84,8 @@ namespace ssu
void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, uint32_t relayTag);
void ProcessData (uint8_t * buf, size_t len);
void SendMsgAck (uint32_t msgID);
void SendSesionDestroyed ();
bool ProcessIntroKeyEncryptedMessage (uint8_t expectedPayloadType, i2p::data::RouterInfo& r, uint8_t * buf, size_t len);
void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, uint8_t * aesKey, uint8_t * iv, uint8_t * macKey);
void Decrypt (uint8_t * buf, size_t len, uint8_t * aesKey);
@ -109,7 +112,9 @@ namespace ssu
void Start ();
void Stop ();
SSUSession * GetSession (i2p::data::RouterInfo * router);
void DeleteSession (SSUSession * session);
void DeleteAllSessions ();
const boost::asio::ip::udp::endpoint& GetEndpoint () const { return m_Endpoint; };
void Send (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);

41
Transports.cpp
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@ -25,6 +25,7 @@ namespace i2p
{
m_IsRunning = true;
m_Thread = new std::thread (std::bind (&Transports::Run, this));
m_Timer = new boost::asio::deadline_timer (m_Service);
// create acceptors
auto addresses = context.GetRouterInfo ().GetAddresses ();
for (auto& address : addresses)
@ -38,9 +39,11 @@ namespace i2p
auto conn = new i2p::ntcp::NTCPServerConnection (m_Service);
m_NTCPAcceptor->async_accept(conn->GetSocket (), boost::bind (&Transports::HandleAccept, this,
conn, boost::asio::placeholders::error));
}
// temporary always run SSU server
// TODO: uncomment following lines later
/*}
else if (address.transportStyle == RouterInfo::eTransportSSU)
{
{*/
if (!m_SSUServer)
{
m_SSUServer = new i2p::ssu::SSUServer (m_Service, address.port);
@ -51,6 +54,9 @@ namespace i2p
LogPrint ("SSU server already exists");
}
}
// TODO: do it for SSU only
DetectExternalIP ();
}
void Transports::Stop ()
@ -59,7 +65,10 @@ namespace i2p
delete session.second;
m_NTCPSessions.clear ();
delete m_NTCPAcceptor;
m_Timer->cancel ();
delete m_Timer;
if (m_SSUServer)
{
m_SSUServer->Stop ();
@ -173,4 +182,30 @@ namespace i2p
else
LogPrint ("Session not found");
}
void Transports::DetectExternalIP ()
{
for (int i = 0; i < 5; i ++)
{
auto router = i2p::data::netdb.GetRandomRouter ();
if (router && router->IsSSU () && m_SSUServer)
m_SSUServer->GetSession (const_cast<i2p::data::RouterInfo *>(router)); //TODO
}
if (m_Timer)
{
m_Timer->expires_from_now (boost::posix_time::seconds(5)); // 5 seconds
m_Timer->async_wait (boost::bind (&Transports::HandleTimer, this, boost::asio::placeholders::error));
}
}
void Transports::HandleTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
// end of external IP detection
if (m_SSUServer)
m_SSUServer->DeleteAllSessions ();
}
}
}

4
Transports.h
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@ -38,6 +38,9 @@ namespace i2p
void Run ();
void HandleAccept (i2p::ntcp::NTCPServerConnection * conn, const boost::system::error_code& error);
void PostMessage (const i2p::data::IdentHash& ident, i2p::I2NPMessage * msg);
void DetectExternalIP ();
void HandleTimer (const boost::system::error_code& ecode);
private:
@ -49,6 +52,7 @@ namespace i2p
std::map<i2p::data::IdentHash, i2p::ntcp::NTCPSession *> m_NTCPSessions;
i2p::ssu::SSUServer * m_SSUServer;
boost::asio::deadline_timer * m_Timer;
public:

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