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I2P: End-to-End encrypted and anonymous Internet
https://i2pd.website/
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525 lines
19 KiB
525 lines
19 KiB
#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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{ |
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bool addresshelper; i2p::config::GetOption("httpproxy.addresshelper", addresshelper); |
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if (!addresshelper) |
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{ |
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LogPrint(eLogWarning, "HTTPProxy: addresshelper disabled"); |
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GenericProxyError("Invalid request", "adddresshelper is not supported"); |
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return true; |
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} |
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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) { |
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if(ec) GenericProxyError("failed to send request to upstream", ec.message().c_str()); |
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else HandoverToUpstreamProxy(); |
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}); |
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} |
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} |
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void HTTPReqHandler::HandleSocksProxyReply(const boost::system::error_code & ec, std::size_t bytes_transferred) |
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{ |
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if(!ec) |
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{ |
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if(m_socks_buf[1] == 90) { |
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// success |
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SocksProxySuccess(); |
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} else { |
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std::stringstream ss; |
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ss << "error code: "; |
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ss << (int) m_socks_buf[1]; |
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std::string msg = ss.str(); |
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GenericProxyError("Socks Proxy error", msg.c_str()); |
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} |
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} |
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else GenericProxyError("No Reply From socks proxy", ec.message().c_str()); |
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} |
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void HTTPReqHandler::HandleUpstreamHTTPProxyConnect(const boost::system::error_code & ec) |
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{ |
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if(!ec) { |
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LogPrint(eLogDebug, "HTTPProxy: connected to http upstream"); |
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GenericProxyError("cannot connect", "http out proxy not implemented"); |
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} else GenericProxyError("cannot connect to upstream http proxy", ec.message().c_str()); |
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} |
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/* will be called after some data received from client */ |
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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, recv buf: ", m_recv_buf.length(), ", send buf: ", m_send_buf.length()); |
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if(ecode) |
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{ |
|
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
|
|
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