mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2025-04-28 11:47:48 +02:00
Initial HTTPProxy support by simply transferring control to a tunnel
This commit is contained in:
Francisco Blas (klondike) Izquierdo Riera
parent
634718d6b4
commit
6aca908462
2 changed files with 291 additions and 78 deletions
270
HTTPProxy.cpp
270
HTTPProxy.cpp
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@ -1,87 +1,247 @@
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#include <cstring>
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#include <cassert>
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#include <boost/lexical_cast.hpp>
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#include <boost/regex.hpp>
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#include "ClientContext.h"
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#include "HTTPProxy.h"
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#include "Identity.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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namespace i2p
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{
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namespace proxy
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{
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void HTTPProxyConnection::parseHeaders(const std::string& h, std::vector<header>& hm) {
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std::string str (h);
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std::string::size_type idx;
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std::string t;
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int i = 0;
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while( (idx=str.find ("\r\n")) != std::string::npos) {
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t=str.substr (0,idx);
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str.erase (0,idx+2);
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if (t == "")
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break;
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idx=t.find(": ");
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if (idx == std::string::npos)
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{
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std::cout << "Bad header line: " << t << std::endl;
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break;
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}
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LogPrint ("Name: ", t.substr (0,idx), " Value: ", t.substr (idx+2));
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hm[i].name = t.substr (0,idx);
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hm[i].value = t.substr (idx+2);
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i++;
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void HTTPProxyHandler::AsyncSockRead()
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{
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LogPrint(eLogDebug,"--- HTTP Proxy 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(&HTTPProxyHandler::HandleSockRecv, this,
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std::placeholders::_1, std::placeholders::_2));
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} else {
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LogPrint(eLogError,"--- HTTP Proxy no socket for read");
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}
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}
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void HTTPProxyConnection::ExtractRequest(request& r)
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void HTTPProxyHandler::Done() {
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if (m_parent) m_parent->RemoveHandler (shared_from_this ());
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}
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void HTTPProxyHandler::Terminate() {
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if (dead.exchange(true)) return;
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if (m_sock) {
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LogPrint(eLogDebug,"--- HTTP Proxy close sock");
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m_sock->close();
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delete m_sock;
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m_sock = nullptr;
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}
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Done();
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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 HTTPProxyHandler::HTTPRequestFailed(/*HTTPProxyHandler::errTypes error*/)
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{
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std::string requestString = m_Buffer;
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int idx=requestString.find(" ");
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std::string method = requestString.substr(0,idx);
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requestString = requestString.substr(idx+1);
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idx=requestString.find(" ");
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std::string requestUrl = requestString.substr(0,idx);
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LogPrint("method is: ", method, "\nRequest is: ", requestUrl);
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std::string response = "HTTP/1.0 500 Internal Server Error\r\nContent-type: text/html\r\nContent-length: 0\r\n";
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boost::asio::async_write(*m_sock, boost::asio::buffer(response,response.size()),
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std::bind(&HTTPProxyHandler::SentHTTPFailed, this, std::placeholders::_1));
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}
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void HTTPProxyHandler::EnterState(HTTPProxyHandler::state nstate) {
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m_state = nstate;
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}
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void HTTPProxyHandler::ExtractRequest()
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{
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LogPrint(eLogDebug,"--- HTTP Proxy method is: ", m_method, "\nRequest is: ", m_url);
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std::string server="";
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std::string port="80";
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boost::regex rHTTP("http://(.*?)(:(\\d+))?(/.*)");
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boost::smatch m;
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std::string path;
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if(boost::regex_search(requestUrl, m, rHTTP, boost::match_extra)) {
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if(boost::regex_search(m_url, m, rHTTP, boost::match_extra)) {
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server=m[1].str();
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if(m[2].str() != "") {
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port=m[3].str();
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}
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path=m[4].str();
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}
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LogPrint("server is: ",server, " port is: ", port, "\n path is: ",path);
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r.uri = path;
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r.method = method;
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r.host = server;
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r.port = boost::lexical_cast<int>(port);
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LogPrint(eLogDebug,"--- HTTP Proxy server is: ",server, " port is: ", port, "\n path is: ",path);
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m_address = server;
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m_port = boost::lexical_cast<int>(port);
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m_path = path;
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}
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bool HTTPProxyHandler::ValidateHTTPRequest() {
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if ( m_version != "HTTP/1.0" ) {
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//TODO: we want to support 1.1 in the future
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LogPrint(eLogError,"--- HTTP Proxy unsupported version: ", m_version);
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HTTPRequestFailed(); //TODO: send right stuff
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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 HTTPProxyConnection::RunRequest()
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bool HTTPProxyHandler::CreateHTTPRequest(uint8_t *http_buff, std::size_t len) {
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ExtractRequest(); //TODO: parse earlier
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if (!ValidateHTTPRequest()) return false;
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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(reinterpret_cast<const char *>(http_buff),len);
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return true;
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}
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bool HTTPProxyHandler::HandleData(uint8_t *http_buff, std::size_t len)
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{
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request r;
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ExtractRequest(r);
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parseHeaders(m_Buffer, r.headers);
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size_t addressHelperPos = r.uri.find ("i2paddresshelper");
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if (addressHelperPos != std::string::npos)
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{
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// jump service
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size_t addressPos = r.uri.find ("=", addressHelperPos);
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if (addressPos != std::string::npos)
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{
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LogPrint ("Jump service for ", r.host, " found. Inserting to address book");
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auto base64 = r.uri.substr (addressPos + 1);
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i2p::client::context.GetAddressBook ().InsertAddress (r.host, base64);
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assert(len); // This should always be called with a least a byte left to parse
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while (len > 0) {
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//TODO: fallback to finding HOst: header if needed
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switch (m_state) {
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case GET_METHOD:
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switch (*http_buff) {
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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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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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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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case '\n': EnterState(DONE); break;
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default:
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LogPrint(eLogError,"--- HTTP Proxy rejected invalid request ending with: ", ((int)*http_buff));
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HTTPRequestFailed(); //TODO: add correct code
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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,"--- HTTP Proxy invalid state: ", m_state);
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HTTPRequestFailed(); //TODO: add correct code 500
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return false;
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}
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}
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LogPrint("Requesting ", r.host, ":", r.port, " with path ", r.uri, " and method ", r.method);
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SendToAddress (r.host, r.port, m_Buffer, m_BufferLen);
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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 HTTPProxyHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
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{
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LogPrint(eLogDebug,"--- HTTP Proxy sock recv: ", len);
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if(ecode) {
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LogPrint(eLogWarning," --- HTTP Proxy 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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if (m_state == DONE) {
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LogPrint(eLogInfo,"--- HTTP Proxy requested: ", m_url);
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m_parent->GetLocalDestination ()->CreateStream (
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std::bind (&HTTPProxyHandler::HandleStreamRequestComplete,
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this, std::placeholders::_1), m_address, m_port);
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} else {
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AsyncSockRead();
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}
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}
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}
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void HTTPProxyHandler::SentHTTPFailed(const boost::system::error_code & ecode)
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{
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if (!ecode) {
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Terminate();
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} else {
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LogPrint (eLogError,"--- HTTP Proxy Closing socket after sending failure because: ", ecode.message ());
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Terminate();
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}
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}
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void HTTPProxyHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream)
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{
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if (stream) {
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if (dead.exchange(true)) return;
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LogPrint (eLogInfo,"--- HTTP Proxy New I2PTunnel connection");
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auto connection = std::make_shared<i2p::client::I2PTunnelConnection>((i2p::client::I2PTunnel *)m_parent, m_sock, stream);
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m_parent->AddConnection (connection);
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connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_request.data()), m_request.size());
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Done();
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} else {
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LogPrint (eLogError,"--- HTTP Proxy Issue when creating the stream, check the previous warnings for more info.");
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HTTPRequestFailed(); // TODO: Send correct error message host unreachable
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}
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}
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void HTTPProxyServer::Start ()
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{
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m_Acceptor.listen ();
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Accept ();
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}
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void HTTPProxyServer::Stop ()
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{
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m_Acceptor.close();
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m_Timer.cancel ();
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ClearConnections ();
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ClearHandlers();
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}
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void HTTPProxyServer::Accept ()
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{
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auto newSocket = new boost::asio::ip::tcp::socket (GetService ());
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m_Acceptor.async_accept (*newSocket, std::bind (&HTTPProxyServer::HandleAccept, this,
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std::placeholders::_1, newSocket));
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}
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void HTTPProxyServer::AddHandler (std::shared_ptr<HTTPProxyHandler> handler) {
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std::unique_lock<std::mutex> l(m_HandlersMutex);
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m_Handlers.insert (handler);
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}
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void HTTPProxyServer::RemoveHandler (std::shared_ptr<HTTPProxyHandler> handler)
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{
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std::unique_lock<std::mutex> l(m_HandlersMutex);
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m_Handlers.erase (handler);
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}
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void HTTPProxyServer::ClearHandlers ()
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{
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std::unique_lock<std::mutex> l(m_HandlersMutex);
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m_Handlers.clear ();
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}
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void HTTPProxyServer::HandleAccept (const boost::system::error_code& ecode, boost::asio::ip::tcp::socket * socket)
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{
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if (!ecode)
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{
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LogPrint(eLogDebug,"--- HTTP Proxy accepted");
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AddHandler(std::make_shared<HTTPProxyHandler> (this, socket));
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Accept();
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}
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else
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{
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LogPrint (eLogError,"--- HTTP Proxy Closing socket on accept because: ", ecode.message ());
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delete socket;
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}
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}
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}
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}
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