I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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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 "HTTPProxy.h"
namespace i2p
{
namespace proxy
{
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)
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{
m_Buffer[bytes_transferred] = 0;
std::pair<std::string,std::string> requestInfo = ExtractRequest ();
request m_Request;
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parseHeaders (m_Buffer, m_Request.headers);
LogPrint("Requesting ", requestInfo.first, " with path ", requestInfo.second);
HandleDestinationRequest (requestInfo.first, requestInfo.second);
boost::asio::async_write (*m_Socket, m_Reply.to_buffers(),
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boost::bind (&HTTPConnection::HandleWrite, this,
boost::asio::placeholders::error));
//Receive ();
}
else if (ecode != boost::asio::error::operation_aborted)
Terminate ();
}
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void HTTPConnection::parseHeaders(const std::string& h, std::vector<header>& hm) {
std::string str (h);
std::string::size_type idx;
std::string t;
int i = 0;
while( (idx=str.find ("\r\n")) != std::string::npos) {
t=str.substr (0,idx);
str.erase (0,idx+2);
if (t == "")
break;
idx=t.find(": ");
if (idx == std::string::npos)
{
std::cout << "Bad header line: " << t << std::endl;
break;
}
LogPrint ("Name: ", t.substr (0,idx), " Value: ", t.substr (idx+2));
hm[i].name = t.substr (0,idx);
hm[i].value = t.substr (idx+2);
i++;
}
}
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// TODO: Support other requests than GET.
std::pair<std::string, std::string> HTTPConnection::ExtractRequest ()
{
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char * get = strstr (m_Buffer, "GET");
if (get)
{
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char * http = strstr (get, "HTTP");
if (http)
{
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std::string url (get + 4, http - get - 5);
size_t sp = url.find_first_of ('/', 7 /* skip http:// part */ );
if (sp != std::string::npos)
{
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std::string base_url (url.begin()+7, url.begin()+sp);
LogPrint ("Base URL is: ", base_url, "\n");
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if ( sp != std::string::npos )
{
std::string query (url.begin ()+sp+1, url.end ());
LogPrint ("Query is: ", "/" + query);
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return std::make_pair (base_url, "/" + query);
}
return std::make_pair (base_url, "/");
}
}
}
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return std::make_pair ("","");
}
void HTTPConnection::HandleWrite (const boost::system::error_code& ecode)
{
Terminate ();
}
void HTTPConnection::HandleDestinationRequest (const std::string& address, const std::string& uri)
{
i2p::data::IdentHash destination;
std::string fullAddress;
if (address.find (".b32.i2p") != std::string::npos)
{
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int li = address.find_first_of (".");
std::string newaddress = address.substr (0, li);
if (i2p::data::Base32ToByteStream (newaddress.c_str (), newaddress.length (), (uint8_t *)destination, 32) != 32)
{
LogPrint ("Invalid Base32 address ", newaddress);
return;
}
fullAddress = newaddress + ".b32.i2p";
}
else
{
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auto addr = i2p::data::netdb.FindAddress (address);
if (!addr)
{
LogPrint ("Unknown address ", address);
return;
}
destination = *addr;
fullAddress = address;
}
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>"+ i2p::proxy::itoopieImage +"<br>Leases expired</html>" : "<html>"+ i2p::proxy::itoopieImage +"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>"+ i2p::proxy::itoopieImage +"<br>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";
}
}
HTTPProxy::HTTPProxy (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)
{
}
HTTPProxy::~HTTPProxy ()
{
Stop ();
}
void HTTPProxy::Start ()
{
m_Thread = new std::thread (std::bind (&HTTPProxy::Run, this));
m_Acceptor.listen ();
Accept ();
}
void HTTPProxy::Stop ()
{
m_Acceptor.close();
m_Service.stop ();
if (m_Thread)
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{
m_Thread->join ();
delete m_Thread;
m_Thread = nullptr;
}
}
void HTTPProxy::Run ()
{
m_Service.run ();
}
void HTTPProxy::Accept ()
{
m_NewSocket = new boost::asio::ip::tcp::socket (m_Service);
m_Acceptor.async_accept (*m_NewSocket, boost::bind (&HTTPProxy::HandleAccept, this,
boost::asio::placeholders::error));
}
void HTTPProxy::HandleAccept(const boost::system::error_code& ecode)
{
if (!ecode)
{
new HTTPConnection (m_NewSocket);
Accept ();
}
}
}
}