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I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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i2pd/HTTPServer.cpp

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#include <boost/bind.hpp>
#include <boost/lexical_cast.hpp>
#include "base64.h"
#include "Log.h"
#include "Tunnel.h"
#include "TransitTunnel.h"
#include "Transports.h"
#include "NetDb.h"
#include "Streaming.h"
#include "HTTPServer.h"
namespace i2p
{
namespace util
{
namespace misc_strings
{
const char name_value_separator[] = { ':', ' ' };
const char crlf[] = { '\r', '\n' };
} // namespace misc_strings
std::vector<boost::asio::const_buffer> HTTPConnection::reply::to_buffers()
{
std::vector<boost::asio::const_buffer> buffers;
if (headers.size () > 0)
{
buffers.push_back (boost::asio::buffer ("HTTP/1.0 200 OK\r\n")); // always OK
for (std::size_t i = 0; i < headers.size(); ++i)
{
header& h = headers[i];
buffers.push_back(boost::asio::buffer(h.name));
buffers.push_back(boost::asio::buffer(misc_strings::name_value_separator));
buffers.push_back(boost::asio::buffer(h.value));
buffers.push_back(boost::asio::buffer(misc_strings::crlf));
}
buffers.push_back(boost::asio::buffer(misc_strings::crlf));
}
buffers.push_back(boost::asio::buffer(content));
return buffers;
}
void HTTPConnection::Terminate ()
{
m_Socket->close ();
delete this;
}
void HTTPConnection::Receive ()
{
m_Socket->async_read_some (boost::asio::buffer (m_Buffer, 8192),
boost::bind(&HTTPConnection::HandleReceive, this,
boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
}
void HTTPConnection::HandleReceive (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (!ecode)
{
m_Buffer[bytes_transferred] = 0;
auto address = ExtractAddress ();
if (address.length () > 1) // not just '/'
{
std::string uri ("/"), b32;
size_t pos = address.find ('/', 1);
if (pos == std::string::npos)
b32 = address.substr (1); // excluding leading '/' to end of line
else
{
b32 = address.substr (1, pos - 1); // excluding leading '/' to next '/'
uri = address.substr (pos); // rest of line
}
HandleDestinationRequest (b32, uri);
}
else
HandleRequest ();
boost::asio::async_write (*m_Socket, m_Reply.to_buffers(),
boost::bind (&HTTPConnection::HandleWrite, this,
boost::asio::placeholders::error));
//Receive ();
}
else if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
std::string HTTPConnection::ExtractAddress ()
{
char * get = strstr (m_Buffer, "GET");
if (get)
{
char * http = strstr (get, "HTTP");
if (http)
return std::string (get + 4, http - get - 5);
}
return "";
}
void HTTPConnection::HandleWrite (const boost::system::error_code& ecode)
{
Terminate ();
}
void HTTPConnection::HandleRequest ()
{
std::stringstream s;
s << "<html>";
FillContent (s);
s << "</html>";
m_Reply.content = s.str ();
m_Reply.headers.resize(2);
m_Reply.headers[0].name = "Content-Length";
m_Reply.headers[0].value = boost::lexical_cast<std::string>(m_Reply.content.size());
m_Reply.headers[1].name = "Content-Type";
m_Reply.headers[1].value = "text/html";
}
void HTTPConnection::FillContent (std::stringstream& s)
{
s << "Our external address:" << "<BR>" << "<BR>";
for (auto& address : i2p::context.GetRouterInfo().GetAddresses())
{
switch (address.transportStyle)
{
case i2p::data::RouterInfo::eTransportNTCP:
s << "NTCP&nbsp;&nbsp;";
break;
case i2p::data::RouterInfo::eTransportSSU:
s << "SSU&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;";
break;
default:
s << "Unknown&nbsp;&nbsp;";
}
s << address.host.to_string() << ":" << address.port << "<BR>";
}
s << "<P>Tunnels</P>";
for (auto it: i2p::tunnel::tunnels.GetOutboundTunnels ())
{
it->GetTunnelConfig ()->Print (s);
if (it->GetTunnelPool ())
s << " " << "Pool";
s << " " << (int)it->GetNumSentBytes () << "<BR>";
}
for (auto it: i2p::tunnel::tunnels.GetInboundTunnels ())
{
it.second->GetTunnelConfig ()->Print (s);
if (it.second->GetTunnelPool ())
s << " " << "Pool";
s << " " << (int)it.second->GetNumReceivedBytes () << "<BR>";
}
s << "<P>Transit tunnels</P>";
for (auto it: i2p::tunnel::tunnels.GetTransitTunnels ())
{
if (dynamic_cast<i2p::tunnel::TransitTunnelGateway *>(it.second))
s << it.second->GetTunnelID () << "-->";
else if (dynamic_cast<i2p::tunnel::TransitTunnelEndpoint *>(it.second))
s << "-->" << it.second->GetTunnelID ();
else
s << "-->" << it.second->GetTunnelID () << "-->";
s << " " << it.second->GetNumTransmittedBytes () << "<BR>";
}
s << "<P>Transports</P>";
s << "NTCP<BR>";
for (auto it: i2p::transports.GetNTCPSessions ())
{
// RouterInfo of incoming connection doesn't have address
bool outgoing = it.second->GetRemoteRouterInfo ().GetNTCPAddress ();
if (it.second->IsEstablished ())
{
if (outgoing) s << "-->";
s << it.second->GetRemoteRouterInfo ().GetIdentHashAbbreviation () << ": "
<< it.second->GetSocket ().remote_endpoint().address ().to_string ();
if (!outgoing) s << "-->";
s << "<BR>";
}
}
auto ssuServer = i2p::transports.GetSSUServer ();
if (ssuServer)
{
s << "<BR>SSU<BR>";
for (auto it: ssuServer->GetSessions ())
{
// incoming connections don't have remote router
bool outgoing = it.second->GetRemoteRouter ();
auto endpoint = it.second->GetRemoteEndpoint ();
if (outgoing) s << "-->";
s << endpoint.address ().to_string () << ":" << endpoint.port ();
if (!outgoing) s << "-->";
s << "<BR>";
}
}
s << "<p><a href=\"zmw2cyw2vj7f6obx3msmdvdepdhnw2ctc4okza2zjxlukkdfckhq\">Flibusta</a></p>";
}
void HTTPConnection::HandleDestinationRequest (const std::string& address, const std::string& uri)
{
i2p::data::IdentHash destination;
std::string fullAddress;
if (address.find (".i2p") != std::string::npos)
{
auto addr = i2p::data::netdb.FindAddress(address);
if (!addr)
{
LogPrint ("Unknown address ", address);
return;
}
destination = *addr;
fullAddress = address;
}
else
{
if (i2p::data::Base32ToByteStream (address.c_str (), address.length (), (uint8_t *)destination, 32) != 32)
{
LogPrint ("Invalid Base32 address ", address);
return;
}
fullAddress = address + ".b32.i2p";
}
auto leaseSet = i2p::data::netdb.FindLeaseSet (destination);
if (!leaseSet || !leaseSet->HasNonExpiredLeases ())
{
i2p::data::netdb.Subscribe(destination);
std::this_thread::sleep_for (std::chrono::seconds(10)); // wait for 10 seconds
leaseSet = i2p::data::netdb.FindLeaseSet (destination);
if (!leaseSet || !leaseSet->HasNonExpiredLeases ()) // still no LeaseSet
{
m_Reply.content = leaseSet ? "<html>Leases expired</html>" : "<html>LeaseSet not found</html>";
m_Reply.headers.resize(2);
m_Reply.headers[0].name = "Content-Length";
m_Reply.headers[0].value = boost::lexical_cast<std::string>(m_Reply.content.size());
m_Reply.headers[1].name = "Content-Type";
m_Reply.headers[1].value = "text/html";
return;
}
}
auto s = i2p::stream::CreateStream (*leaseSet);
if (s)
{
std::string request = "GET " + uri + " HTTP/1.1\n Host:" + fullAddress + "\n";
s->Send ((uint8_t *)request.c_str (), request.length (), 10);
std::stringstream ss;
uint8_t buf[8192];
size_t r = s->Receive (buf, 8192, 30); // 30 seconds
if (!r && s->IsEstablished ()) // nothing received but connection is established
r = s->Receive (buf, 8192, 30); // wait for another 30 secondd
if (r) // we recieved data
{
ss << std::string ((char *)buf, r);
while (s->IsOpen () && (r = s->Receive (buf, 8192, 30)) > 0)
ss << std::string ((char *)buf,r);
m_Reply.content = ss.str (); // send "as is"
m_Reply.headers.resize(0); // no headers
return;
}
else // nothing received
ss << "<html>Not responding</html>";
s->Close ();
DeleteStream (s);
m_Reply.content = ss.str ();
m_Reply.headers.resize(2);
m_Reply.headers[0].name = "Content-Length";
m_Reply.headers[0].value = boost::lexical_cast<std::string>(m_Reply.content.size());
m_Reply.headers[1].name = "Content-Type";
m_Reply.headers[1].value = "text/html";
}
}
HTTPServer::HTTPServer (int port):
m_Thread (nullptr), m_Work (m_Service),
m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), port)),
m_NewSocket (nullptr)
{
}
HTTPServer::~HTTPServer ()
{
Stop ();
}
void HTTPServer::Start ()
{
m_Thread = new std::thread (std::bind (&HTTPServer::Run, this));
m_Acceptor.listen ();
Accept ();
}
void HTTPServer::Stop ()
{
m_Acceptor.close();
m_Service.stop ();
if (m_Thread)
{
m_Thread->join ();
delete m_Thread;
m_Thread = nullptr;
}
}
void HTTPServer::Run ()
{
m_Service.run ();
}
void HTTPServer::Accept ()
{
m_NewSocket = new boost::asio::ip::tcp::socket (m_Service);
m_Acceptor.async_accept (*m_NewSocket, boost::bind (&HTTPServer::HandleAccept, this,
boost::asio::placeholders::error));
}
void HTTPServer::HandleAccept(const boost::system::error_code& ecode)
{
if (!ecode)
{
new HTTPConnection (m_NewSocket);
Accept ();
}
}
}
}