mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-10-31 09:20:38 +00:00
518 lines
19 KiB
C++
518 lines
19 KiB
C++
#include <cstring>
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#include <cassert>
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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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std::map<std::string, std::string> jumpservices = {
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{ "inr.i2p", "http://joajgazyztfssty4w2on5oaqksz6tqoxbduy553y34mf4byv6gpq.b32.i2p/search/?q=" },
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{ "stats.i2p", "http://7tbay5p4kzeekxvyvbf6v7eauazemsnnl2aoyqhg5jzpr5eke7tq.b32.i2p/cgi-bin/jump.cgi?a=" },
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};
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static const char *pageHead =
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"<head>\r\n"
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" <title>I2Pd HTTP proxy</title>\r\n"
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" <style type=\"text/css\">\r\n"
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" body { font: 100%/1.5em sans-serif; margin: 0; padding: 1.5em; background: #FAFAFA; color: #103456; }\r\n"
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" .header { font-size: 2.5em; text-align: center; margin: 1.5em 0; color: #894C84; }\r\n"
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" </style>\r\n"
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"</head>\r\n"
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;
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bool str_rmatch(std::string & str, const char *suffix) {
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auto pos = str.rfind (suffix);
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if (pos == std::string::npos)
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return false; /* not found */
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if (str.length() == (pos + std::strlen(suffix)))
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return true; /* match */
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return false;
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}
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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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bool HandleRequest();
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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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bool ExtractAddressHelper(i2p::http::URL & url, std::string & b64);
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void SanitizeHTTPRequest(i2p::http::HTTPReq & req);
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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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/* error helpers */
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void GenericProxyError(const char *title, const char *description);
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void GenericProxyInfo(const char *title, const char *description);
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void HostNotFound(std::string & host);
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void SendProxyError(std::string & content);
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void ForwardToUpstreamProxy();
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void HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec);
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void HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec);
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void HandleSocksProxySendHandshake(const boost::system::error_code & ec, std::size_t bytes_transfered);
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void HandleSocksProxyReply(const boost::system::error_code & ec, std::size_t bytes_transfered);
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typedef std::function<void(boost::asio::ip::tcp::endpoint)> ProxyResolvedHandler;
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void HandleUpstreamProxyResolved(const boost::system::error_code & ecode, boost::asio::ip::tcp::resolver::iterator itr, ProxyResolvedHandler handler);
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void SocksProxySuccess();
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void HandoverToUpstreamProxy();
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uint8_t m_recv_chunk[8192];
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std::string m_recv_buf; // from client
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std::string m_send_buf; // to upstream
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std::shared_ptr<boost::asio::ip::tcp::socket> m_sock;
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std::shared_ptr<boost::asio::ip::tcp::socket> m_proxysock;
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boost::asio::ip::tcp::resolver m_proxy_resolver;
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i2p::http::URL m_ProxyURL;
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i2p::http::URL m_RequestURL;
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uint8_t m_socks_buf[255+8]; // for socks request/response
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ssize_t m_req_len;
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i2p::http::URL m_ClientRequestURL;
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i2p::http::HTTPReq m_ClientRequest;
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i2p::http::HTTPRes m_ClientResponse;
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std::stringstream m_ClientRequestBuffer;
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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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m_proxysock(std::make_shared<boost::asio::ip::tcp::socket>(parent->GetService())),
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m_proxy_resolver(parent->GetService()) {}
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~HTTPReqHandler() { Terminate(); }
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void Handle () { AsyncSockRead(); } /* overload */
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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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LogPrint(eLogError, "HTTPProxy: no socket for read");
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return;
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}
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m_sock->async_read_some(boost::asio::buffer(m_recv_chunk, sizeof(m_recv_chunk)),
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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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}
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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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if(m_proxysock)
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{
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LogPrint(eLogDebug, "HTTPProxy: close proxysock");
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if(m_proxysock->is_open())
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m_proxysock->close();
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m_proxysock = nullptr;
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}
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Done(shared_from_this());
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}
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void HTTPReqHandler::GenericProxyError(const char *title, const char *description) {
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std::stringstream ss;
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ss << "<h1>Proxy error: " << title << "</h1>\r\n";
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ss << "<p>" << description << "</p>\r\n";
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std::string content = ss.str();
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SendProxyError(content);
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}
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void HTTPReqHandler::GenericProxyInfo(const char *title, const char *description) {
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std::stringstream ss;
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ss << "<h1>Proxy info: " << title << "</h1>\r\n";
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ss << "<p>" << description << "</p>\r\n";
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std::string content = ss.str();
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SendProxyError(content);
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}
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void HTTPReqHandler::HostNotFound(std::string & host) {
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std::stringstream ss;
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ss << "<h1>Proxy error: Host not found</h1>\r\n"
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<< "<p>Remote host not found in router's addressbook</p>\r\n"
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<< "<p>You may try to find this host on jumpservices below:</p>\r\n"
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<< "<ul>\r\n";
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for (const auto& js : jumpservices) {
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ss << " <li><a href=\"" << js.second << host << "\">" << js.first << "</a></li>\r\n";
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}
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ss << "</ul>\r\n";
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std::string content = ss.str();
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SendProxyError(content);
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}
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void HTTPReqHandler::SendProxyError(std::string & content)
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{
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i2p::http::HTTPRes res;
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res.code = 500;
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res.add_header("Content-Type", "text/html; charset=UTF-8");
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res.add_header("Connection", "close");
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std::stringstream ss;
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ss << "<html>\r\n" << pageHead
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<< "<body>" << content << "</body>\r\n"
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<< "</html>\r\n";
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res.body = ss.str();
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std::string response = res.to_string();
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boost::asio::async_write(*m_sock, boost::asio::buffer(response), boost::asio::transfer_all(),
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std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
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}
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bool HTTPReqHandler::ExtractAddressHelper(i2p::http::URL & url, std::string & b64)
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{
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const char *param = "i2paddresshelper=";
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std::size_t pos = url.query.find(param);
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std::size_t len = std::strlen(param);
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std::map<std::string, std::string> params;
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if (pos == std::string::npos)
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return false; /* not found */
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if (!url.parse_query(params))
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return false;
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std::string value = params["i2paddresshelper"];
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len += value.length();
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b64 = i2p::http::UrlDecode(value);
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url.query.replace(pos, len, "");
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return true;
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}
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void HTTPReqHandler::SanitizeHTTPRequest(i2p::http::HTTPReq & req)
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{
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/* drop common headers */
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req.RemoveHeader ("Referer");
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req.RemoveHeader("Via");
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req.RemoveHeader("Forwarded");
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/* drop proxy-disclosing headers */
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req.RemoveHeader("X-Forwarded");
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req.RemoveHeader("Proxy-");
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/* replace headers */
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req.UpdateHeader("User-Agent", "MYOB/6.66 (AN/ON)");
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/* add headers */
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req.AddHeader("Connection", "close"); /* keep-alive conns not supported yet */
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}
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/**
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* @brief Try to parse request from @a m_recv_buf
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* If parsing success, rebuild request and store to @a m_send_buf
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* with remaining data tail
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* @return true on processed request or false if more data needed
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*/
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bool HTTPReqHandler::HandleRequest()
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{
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std::string b64;
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m_req_len = m_ClientRequest.parse(m_recv_buf);
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if (m_req_len == 0)
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return false; /* need more data */
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if (m_req_len < 0) {
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LogPrint(eLogError, "HTTPProxy: unable to parse request");
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GenericProxyError("Invalid request", "Proxy unable to parse your request");
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return true; /* parse error */
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}
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/* parsing success, now let's look inside request */
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LogPrint(eLogDebug, "HTTPProxy: requested: ", m_ClientRequest.uri);
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m_RequestURL.parse(m_ClientRequest.uri);
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if (ExtractAddressHelper(m_RequestURL, b64)) {
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i2p::client::context.GetAddressBook ().InsertAddress (m_RequestURL.host, b64);
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LogPrint (eLogInfo, "HTTPProxy: added b64 from addresshelper for ", m_RequestURL.host);
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std::string full_url = m_RequestURL.to_string();
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std::stringstream ss;
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ss << "Host " << m_RequestURL.host << " added to router's addressbook from helper. "
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<< "Click <a href=\"" << full_url << "\">here</a> to proceed.";
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GenericProxyInfo("Addresshelper found", ss.str().c_str());
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return true; /* request processed */
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}
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SanitizeHTTPRequest(m_ClientRequest);
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std::string dest_host = m_RequestURL.host;
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uint16_t dest_port = m_RequestURL.port;
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/* always set port, even if missing in request */
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if (!dest_port)
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dest_port = (m_RequestURL.schema == "https") ? 443 : 80;
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/* detect dest_host, set proper 'Host' header in upstream request */
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if (dest_host != "")
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{
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/* absolute url, replace 'Host' header */
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std::string h = dest_host;
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if (dest_port != 0 && dest_port != 80)
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h += ":" + std::to_string(dest_port);
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m_ClientRequest.UpdateHeader("Host", h);
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}
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else
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{
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auto h = m_ClientRequest.GetHeader ("Host");
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if (h.length () > 0)
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{
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/* relative url and 'Host' header provided. transparent proxy mode? */
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i2p::http::URL u;
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std::string t = "http://" + h;
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u.parse(t);
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dest_host = u.host;
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dest_port = u.port;
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}
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else
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{
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/* relative url and missing 'Host' header */
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GenericProxyError("Invalid request", "Can't detect destination host from request");
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return true;
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}
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}
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/* check dest_host really exists and inside I2P network */
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i2p::data::IdentHash identHash;
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if (str_rmatch(dest_host, ".i2p")) {
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if (!i2p::client::context.GetAddressBook ().GetIdentHash (dest_host, identHash)) {
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HostNotFound(dest_host);
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return true; /* request processed */
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}
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} else {
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std::string outproxyUrl; i2p::config::GetOption("httpproxy.outproxy", outproxyUrl);
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if(outproxyUrl.size()) {
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LogPrint (eLogDebug, "HTTPProxy: use outproxy ", outproxyUrl);
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if(m_ProxyURL.parse(outproxyUrl))
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ForwardToUpstreamProxy();
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else
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GenericProxyError("Outproxy failure", "bad outproxy settings");
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} else {
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LogPrint (eLogWarning, "HTTPProxy: outproxy failure for ", dest_host, ": no outprxy enabled");
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std::string message = "Host" + dest_host + "not inside I2P network, but outproxy is not enabled";
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GenericProxyError("Outproxy failure", message.c_str());
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}
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return true;
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}
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/* make relative url */
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m_RequestURL.schema = "";
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m_RequestURL.host = "";
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m_ClientRequest.uri = m_RequestURL.to_string();
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/* drop original request from recv buffer */
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m_recv_buf.erase(0, m_req_len);
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/* build new buffer from modified request and data from original request */
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m_send_buf = m_ClientRequest.to_string();
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m_send_buf.append(m_recv_buf);
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/* connect to destination */
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LogPrint(eLogDebug, "HTTPProxy: connecting to host ", dest_host, ":", dest_port);
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GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
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shared_from_this(), std::placeholders::_1), dest_host, dest_port);
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return true;
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}
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void HTTPReqHandler::ForwardToUpstreamProxy()
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{
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LogPrint(eLogDebug, "HTTPProxy: forward to upstream");
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// build http requset
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m_ClientRequestURL = m_RequestURL;
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LogPrint(eLogDebug, "HTTPProxy: ", m_ClientRequestURL.host);
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m_ClientRequestURL.schema = "";
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m_ClientRequestURL.host = "";
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m_ClientRequest.uri = m_ClientRequestURL.to_string();
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m_ClientRequest.write(m_ClientRequestBuffer);
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m_ClientRequestBuffer << m_recv_buf.substr(m_req_len);
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// assume http if empty schema
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if (m_ProxyURL.schema == "" || m_ProxyURL.schema == "http") {
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// handle upstream http proxy
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if (!m_ProxyURL.port) m_ProxyURL.port = 80;
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boost::asio::ip::tcp::resolver::query q(m_ProxyURL.host, std::to_string(m_ProxyURL.port));
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m_proxy_resolver.async_resolve(q, std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this, std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep) {
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m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamHTTPProxyConnect, this, std::placeholders::_1));
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}));
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} else if (m_ProxyURL.schema == "socks") {
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// handle upstream socks proxy
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if (!m_ProxyURL.port) m_ProxyURL.port = 9050; // default to tor default if not specified
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boost::asio::ip::tcp::resolver::query q(m_ProxyURL.host, std::to_string(m_ProxyURL.port));
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m_proxy_resolver.async_resolve(q, std::bind(&HTTPReqHandler::HandleUpstreamProxyResolved, this, std::placeholders::_1, std::placeholders::_2, [&](boost::asio::ip::tcp::endpoint ep) {
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m_proxysock->async_connect(ep, std::bind(&HTTPReqHandler::HandleUpstreamSocksProxyConnect, this, std::placeholders::_1));
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}));
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} else {
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// unknown type, complain
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GenericProxyError("unknown outproxy url", m_ProxyURL.to_string().c_str());
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}
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}
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void HTTPReqHandler::HandleUpstreamProxyResolved(const boost::system::error_code & ec, boost::asio::ip::tcp::resolver::iterator it, ProxyResolvedHandler handler)
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{
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if(ec) GenericProxyError("cannot resolve upstream proxy", ec.message().c_str());
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else handler(*it);
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}
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void HTTPReqHandler::HandleUpstreamSocksProxyConnect(const boost::system::error_code & ec)
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{
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if(!ec) {
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if(m_RequestURL.host.size() > 255) {
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GenericProxyError("hostname too long", m_RequestURL.host.c_str());
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return;
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}
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uint16_t port = m_RequestURL.port;
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if(!port) port = 80;
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LogPrint(eLogDebug, "HTTPProxy: connected to socks upstream");
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std::string host = m_RequestURL.host;
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std::size_t reqsize = 0;
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m_socks_buf[0] = '\x04';
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m_socks_buf[1] = 1;
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htobe16buf(m_socks_buf+2, port);
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m_socks_buf[4] = 0;
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m_socks_buf[5] = 0;
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m_socks_buf[6] = 0;
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m_socks_buf[7] = 1;
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// user id
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m_socks_buf[8] = 'i';
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m_socks_buf[9] = '2';
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m_socks_buf[10] = 'p';
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m_socks_buf[11] = 'd';
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m_socks_buf[12] = 0;
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reqsize += 13;
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memcpy(m_socks_buf+ reqsize, host.c_str(), host.size());
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reqsize += host.size();
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m_socks_buf[++reqsize] = 0;
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boost::asio::async_write(*m_proxysock, boost::asio::buffer(m_socks_buf, reqsize), boost::asio::transfer_all(), std::bind(&HTTPReqHandler::HandleSocksProxySendHandshake, this, std::placeholders::_1, std::placeholders::_2));
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} else GenericProxyError("cannot connect to upstream socks proxy", ec.message().c_str());
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}
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void HTTPReqHandler::HandleSocksProxySendHandshake(const boost::system::error_code & ec, std::size_t bytes_transferred)
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{
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LogPrint(eLogDebug, "HTTPProxy: upstream socks handshake sent");
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if(ec) GenericProxyError("Cannot negotiate with socks proxy", ec.message().c_str());
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else m_proxysock->async_read_some(boost::asio::buffer(m_socks_buf, 8), std::bind(&HTTPReqHandler::HandleSocksProxyReply, this, std::placeholders::_1, std::placeholders::_2));
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}
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void HTTPReqHandler::HandoverToUpstreamProxy()
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{
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LogPrint(eLogDebug, "HTTPProxy: handover to socks proxy");
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auto connection = std::make_shared<i2p::client::TCPIPPipe>(GetOwner(), m_proxysock, m_sock);
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m_sock = nullptr;
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m_proxysock = nullptr;
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GetOwner()->AddHandler(connection);
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connection->Start();
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Terminate();
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}
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void HTTPReqHandler::SocksProxySuccess()
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{
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if(m_ClientRequest.method == "CONNECT") {
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m_ClientResponse.code = 200;
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m_send_buf = m_ClientResponse.to_string();
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boost::asio::async_write(*m_sock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&] (const boost::system::error_code & ec, std::size_t transferred) {
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if(ec) GenericProxyError("socks proxy error", ec.message().c_str());
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else HandoverToUpstreamProxy();
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});
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} else {
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m_send_buf = m_ClientRequestBuffer.str();
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LogPrint(eLogDebug, "HTTPProxy: send ", m_send_buf.size(), " bytes");
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boost::asio::async_write(*m_proxysock, boost::asio::buffer(m_send_buf), boost::asio::transfer_all(), [&](const boost::system::error_code & ec, std::size_t transferred) {
|
|
if(ec) GenericProxyError("failed to send request to upstream", ec.message().c_str());
|
|
else HandoverToUpstreamProxy();
|
|
});
|
|
}
|
|
}
|
|
|
|
void HTTPReqHandler::HandleSocksProxyReply(const boost::system::error_code & ec, std::size_t bytes_transferred)
|
|
{
|
|
if(!ec)
|
|
{
|
|
if(m_socks_buf[1] == 90) {
|
|
// success
|
|
SocksProxySuccess();
|
|
} else {
|
|
std::stringstream ss;
|
|
ss << "error code: ";
|
|
ss << (int) m_socks_buf[1];
|
|
std::string msg = ss.str();
|
|
GenericProxyError("Socks Proxy error", msg.c_str());
|
|
}
|
|
}
|
|
else GenericProxyError("No Reply From socks proxy", ec.message().c_str());
|
|
}
|
|
|
|
void HTTPReqHandler::HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec)
|
|
{
|
|
if(!ec) {
|
|
LogPrint(eLogDebug, "HTTPProxy: connected to http upstream");
|
|
GenericProxyError("cannot connect", "http out proxy not implemented");
|
|
} else GenericProxyError("cannot connect to upstream http proxy", ec.message().c_str());
|
|
}
|
|
|
|
/* will be called after some data received from client */
|
|
void HTTPReqHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
|
|
{
|
|
LogPrint(eLogDebug, "HTTPProxy: sock recv: ", len, " bytes, recv buf: ", m_recv_buf.length(), ", send buf: ", m_send_buf.length());
|
|
if(ecode)
|
|
{
|
|
LogPrint(eLogWarning, "HTTPProxy: sock recv got error: ", ecode);
|
|
Terminate();
|
|
return;
|
|
}
|
|
|
|
m_recv_buf.append(reinterpret_cast<const char *>(m_recv_chunk), len);
|
|
if (HandleRequest()) {
|
|
m_recv_buf.clear();
|
|
return;
|
|
}
|
|
AsyncSockRead();
|
|
}
|
|
|
|
void HTTPReqHandler::SentHTTPFailed(const boost::system::error_code & ecode)
|
|
{
|
|
if (ecode)
|
|
LogPrint (eLogError, "HTTPProxy: Closing socket after sending failure because: ", ecode.message ());
|
|
Terminate();
|
|
}
|
|
|
|
void HTTPReqHandler::HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream)
|
|
{
|
|
if (!stream) {
|
|
LogPrint (eLogError, "HTTPProxy: error when creating the stream, check the previous warnings for more info");
|
|
GenericProxyError("Host is down", "Can't create connection to requested host, it may be down");
|
|
return;
|
|
}
|
|
if (Kill())
|
|
return;
|
|
LogPrint (eLogDebug, "HTTPProxy: Created new I2PTunnel stream, sSID=", stream->GetSendStreamID(), ", rSID=", stream->GetRecvStreamID());
|
|
auto connection = std::make_shared<i2p::client::I2PClientTunnelConnectionHTTP>(GetOwner(), m_sock, stream);
|
|
GetOwner()->AddHandler (connection);
|
|
connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_send_buf.data()), m_send_buf.length());
|
|
Done (shared_from_this());
|
|
}
|
|
|
|
HTTPProxy::HTTPProxy(const std::string& address, int port, std::shared_ptr<i2p::client::ClientDestination> localDestination):
|
|
TCPIPAcceptor(address, port, localDestination ? localDestination : i2p::client::context.GetSharedLocalDestination ())
|
|
{
|
|
}
|
|
|
|
std::shared_ptr<i2p::client::I2PServiceHandler> HTTPProxy::CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
|
|
{
|
|
return std::make_shared<HTTPReqHandler> (this, socket);
|
|
}
|
|
} // http
|
|
} // i2p
|