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365 lines
11 KiB
C++
365 lines
11 KiB
C++
#include <cstring>
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#include <cassert>
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#include <boost/lexical_cast.hpp>
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#include <string>
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#include <atomic>
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#include <memory>
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#include <set>
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#include <boost/asio.hpp>
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#include <mutex>
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#include "I2PService.h"
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#include "Destination.h"
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#include "HTTPProxy.h"
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#include "util.h"
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#include "Identity.h"
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#include "Streaming.h"
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#include "Destination.h"
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#include "ClientContext.h"
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#include "I2PEndian.h"
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#include "I2PTunnel.h"
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#include "Config.h"
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#include "HTTP.h"
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namespace i2p {
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namespace proxy {
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static const size_t http_buffer_size = 8192;
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class HTTPReqHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<HTTPReqHandler>
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{
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private:
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enum state
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{
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GET_METHOD,
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GET_HOSTNAME,
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GET_HTTPV,
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GET_HTTPVNL, //TODO: fallback to finding HOst: header if needed
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DONE
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};
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void EnterState(state nstate);
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bool HandleData(uint8_t *http_buff, std::size_t len);
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void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
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void Terminate();
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void AsyncSockRead();
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void HTTPRequestFailed(const char *message);
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void RedirectToJumpService();
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void ExtractRequest();
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bool IsI2PAddress();
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bool ValidateHTTPRequest();
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void HandleJumpServices();
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bool CreateHTTPRequest(uint8_t *http_buff, std::size_t len);
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void SentHTTPFailed(const boost::system::error_code & ecode);
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void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
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uint8_t m_http_buff[http_buffer_size];
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std::shared_ptr<boost::asio::ip::tcp::socket> m_sock;
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std::string m_request; //Data left to be sent
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std::string m_url; //URL
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std::string m_method; //Method
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std::string m_version; //HTTP version
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std::string m_address; //Address
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std::string m_path; //Path
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int m_port; //Port
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state m_state;//Parsing state
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public:
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HTTPReqHandler(HTTPProxy * parent, std::shared_ptr<boost::asio::ip::tcp::socket> sock) :
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I2PServiceHandler(parent), m_sock(sock)
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{ EnterState(GET_METHOD); }
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~HTTPReqHandler() { Terminate(); }
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void Handle () { AsyncSockRead(); }
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};
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void HTTPReqHandler::AsyncSockRead()
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{
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LogPrint(eLogDebug, "HTTPProxy: async sock read");
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if(m_sock) {
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m_sock->async_receive(boost::asio::buffer(m_http_buff, http_buffer_size),
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std::bind(&HTTPReqHandler::HandleSockRecv, shared_from_this(),
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std::placeholders::_1, std::placeholders::_2));
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} else {
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LogPrint(eLogError, "HTTPProxy: no socket for read");
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}
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}
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void HTTPReqHandler::Terminate() {
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if (Kill()) return;
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if (m_sock)
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{
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LogPrint(eLogDebug, "HTTPProxy: close sock");
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m_sock->close();
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m_sock = nullptr;
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}
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Done(shared_from_this());
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}
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/* All hope is lost beyond this point */
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//TODO: handle this apropriately
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void HTTPReqHandler::HTTPRequestFailed(const char *message)
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{
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std::size_t size = std::strlen(message);
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std::stringstream ss;
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ss << "HTTP/1.0 500 Internal Server Error\r\n"
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<< "Content-Type: text/plain\r\n";
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ss << "Content-Length: " << std::to_string(size + 2) << "\r\n"
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<< "\r\n"; /* end of headers */
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ss << message << "\r\n";
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std::string response = ss.str();
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boost::asio::async_write(*m_sock, boost::asio::buffer(response),
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std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
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}
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void HTTPReqHandler::RedirectToJumpService(/*HTTPReqHandler::errTypes error*/)
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{
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std::stringstream ss;
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std::string httpAddr; i2p::config::GetOption("http.address", httpAddr);
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uint16_t httpPort; i2p::config::GetOption("http.port", httpPort);
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ss << "HTTP/1.1 302 Found\r\n"
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<< "Connection: close\r\n"
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<< "Location: http://" << httpAddr << ":" << httpPort << "/?page=jumpservices&address=" << m_address << "\r\n"
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<< "\r\n";
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std::string response = ss.str();
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boost::asio::async_write(*m_sock, boost::asio::buffer(response),
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std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
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}
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void HTTPReqHandler::EnterState(HTTPReqHandler::state nstate)
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{
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m_state = nstate;
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}
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void HTTPReqHandler::ExtractRequest()
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{
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LogPrint(eLogDebug, "HTTPProxy: request: ", m_method, " ", m_url);
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i2p::http::URL url;
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url.parse (m_url);
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m_address = url.host;
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m_port = url.port;
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m_path = url.path;
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if (url.query.length () > 0) m_path += "?" + url.query;
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if (!m_port) m_port = 80;
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LogPrint(eLogDebug, "HTTPProxy: server: ", m_address, ", port: ", m_port, ", path: ", m_path);
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}
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bool HTTPReqHandler::ValidateHTTPRequest()
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{
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if ( m_version != "HTTP/1.0" && m_version != "HTTP/1.1" )
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{
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LogPrint(eLogError, "HTTPProxy: unsupported version: ", m_version);
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HTTPRequestFailed("unsupported HTTP version");
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return false;
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}
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return true;
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}
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void HTTPReqHandler::HandleJumpServices()
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{
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static const char * helpermark1 = "?i2paddresshelper=";
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static const char * helpermark2 = "&i2paddresshelper=";
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size_t addressHelperPos1 = m_path.rfind (helpermark1);
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size_t addressHelperPos2 = m_path.rfind (helpermark2);
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size_t addressHelperPos;
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if (addressHelperPos1 == std::string::npos)
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{
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if (addressHelperPos2 == std::string::npos)
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return; //Not a jump service
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else
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addressHelperPos = addressHelperPos2;
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}
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else
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{
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if (addressHelperPos2 == std::string::npos)
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addressHelperPos = addressHelperPos1;
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else if ( addressHelperPos1 > addressHelperPos2 )
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addressHelperPos = addressHelperPos1;
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else
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addressHelperPos = addressHelperPos2;
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}
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auto base64 = m_path.substr (addressHelperPos + strlen(helpermark1));
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base64 = i2p::util::http::urlDecode(base64); //Some of the symbols may be urlencoded
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LogPrint (eLogInfo, "HTTPProxy: jump service for ", m_address, ", inserting to address book");
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//TODO: this is very dangerous and broken. We should ask the user before doing anything see http://pastethis.i2p/raw/pn5fL4YNJL7OSWj3Sc6N/
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//TODO: we could redirect the user again to avoid dirtiness in the browser
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i2p::client::context.GetAddressBook ().InsertAddress (m_address, base64);
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m_path.erase(addressHelperPos);
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}
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bool HTTPReqHandler::IsI2PAddress()
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{
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auto pos = m_address.rfind (".i2p");
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if (pos != std::string::npos && (pos+4) == m_address.length ())
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{
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return true;
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}
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return false;
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}
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bool HTTPReqHandler::CreateHTTPRequest(uint8_t *http_buff, std::size_t len)
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{
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ExtractRequest(); //TODO: parse earlier
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if (!ValidateHTTPRequest()) return false;
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HandleJumpServices();
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i2p::data::IdentHash identHash;
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if (IsI2PAddress ())
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{
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if (!i2p::client::context.GetAddressBook ().GetIdentHash (m_address, identHash)){
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RedirectToJumpService();
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return false;
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}
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}
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m_request = m_method;
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m_request.push_back(' ');
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m_request += m_path;
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m_request.push_back(' ');
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m_request += m_version;
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m_request.push_back('\r');
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m_request.push_back('\n');
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m_request.append("Connection: close\r\n");
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// TODO: temporary shortcut. Must be implemented properly
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uint8_t * eol = nullptr;
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bool isEndOfHeader = false;
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while (!isEndOfHeader && len && (eol = (uint8_t *)memchr (http_buff, '\r', len)))
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{
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if (eol)
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{
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*eol = 0; eol++;
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if (strncmp ((const char *)http_buff, "Referer", 7) && strncmp ((const char *)http_buff, "Connection", 10)) // strip out referer and connection
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{
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if (!strncmp ((const char *)http_buff, "User-Agent", 10)) // replace UserAgent
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m_request.append("User-Agent: MYOB/6.66 (AN/ON)");
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else
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m_request.append ((const char *)http_buff);
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m_request.append ("\r\n");
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}
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isEndOfHeader = !http_buff[0];
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auto l = eol - http_buff;
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http_buff = eol;
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len -= l;
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if (len > 0) // \r
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{
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http_buff++;
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len--;
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}
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}
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}
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m_request.append(reinterpret_cast<const char *>(http_buff),len);
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return true;
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}
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bool HTTPReqHandler::HandleData(uint8_t *http_buff, std::size_t len)
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{
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while (len > 0)
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{
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//TODO: fallback to finding HOst: header if needed
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switch (m_state)
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{
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case GET_METHOD:
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switch (*http_buff)
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{
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case ' ': EnterState(GET_HOSTNAME); break;
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default: m_method.push_back(*http_buff); break;
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}
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break;
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case GET_HOSTNAME:
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switch (*http_buff)
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{
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case ' ': EnterState(GET_HTTPV); break;
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default: m_url.push_back(*http_buff); break;
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}
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break;
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case GET_HTTPV:
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switch (*http_buff)
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{
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case '\r': EnterState(GET_HTTPVNL); break;
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default: m_version.push_back(*http_buff); break;
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}
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break;
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case GET_HTTPVNL:
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switch (*http_buff)
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{
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case '\n': EnterState(DONE); break;
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default:
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LogPrint(eLogError, "HTTPProxy: rejected invalid request ending with: ", ((int)*http_buff));
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HTTPRequestFailed("rejected invalid request");
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return false;
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}
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break;
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default:
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LogPrint(eLogError, "HTTPProxy: invalid state: ", m_state);
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HTTPRequestFailed("invalid parser state");
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return false;
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}
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http_buff++;
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len--;
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if (m_state == DONE)
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return CreateHTTPRequest(http_buff,len);
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}
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return true;
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}
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void HTTPReqHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
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{
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LogPrint(eLogDebug, "HTTPProxy: sock recv: ", len, " bytes");
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if(ecode)
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{
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LogPrint(eLogWarning, "HTTPProxy: sock recv got error: ", ecode);
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Terminate();
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return;
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}
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if (HandleData(m_http_buff, len))
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{
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if (m_state == DONE)
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{
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LogPrint(eLogDebug, "HTTPProxy: requested: ", m_url);
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GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
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shared_from_this(), std::placeholders::_1), m_address, m_port);
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}
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else
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AsyncSockRead();
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}
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}
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void HTTPReqHandler::SentHTTPFailed(const boost::system::error_code & ecode)
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{
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if (ecode)
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LogPrint (eLogError, "HTTPProxy: Closing socket after sending failure because: ", ecode.message ());
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Terminate();
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}
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void HTTPReqHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream)
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{
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if (stream)
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{
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if (Kill()) return;
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LogPrint (eLogInfo, "HTTPProxy: New I2PTunnel connection");
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auto connection = std::make_shared<i2p::client::I2PTunnelConnection>(GetOwner(), m_sock, stream);
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GetOwner()->AddHandler (connection);
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connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_request.data()), m_request.size());
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Done(shared_from_this());
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}
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else
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{
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LogPrint (eLogError, "HTTPProxy: error when creating the stream, check the previous warnings for more info");
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HTTPRequestFailed("error when creating the stream, check logs");
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}
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}
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HTTPProxy::HTTPProxy(const std::string& address, int port, std::shared_ptr<i2p::client::ClientDestination> localDestination):
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TCPIPAcceptor(address, port, localDestination ? localDestination : i2p::client::context.GetSharedLocalDestination ())
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{
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}
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std::shared_ptr<i2p::client::I2PServiceHandler> HTTPProxy::CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
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{
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return std::make_shared<HTTPReqHandler> (this, socket);
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}
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} // http
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} // i2p
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