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https://github.com/PurpleI2P/i2pd.git
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* HTTPProxy.cpp :
* migrate to HTTPReq * change work with buffers * code cleanup
This commit is contained in:
hagen
parent
642b01bf0d
commit
8deb327b3b
264
HTTPProxy.cpp
264
HTTPProxy.cpp
@ -34,47 +34,29 @@ namespace proxy {
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class HTTPReqHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<HTTPReqHandler>
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{
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private:
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enum state
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{
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GET_METHOD,
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GET_HOSTNAME,
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GET_HTTPV,
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GET_HTTPVNL, //TODO: fallback to finding HOst: header if needed
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DONE
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};
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void EnterState(state nstate);
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bool HandleData(uint8_t *http_buff, std::size_t len);
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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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void HTTPRequestFailed(const char *message);
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void RedirectToJumpService(std::string & host);
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bool ValidateHTTPRequest();
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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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bool CreateHTTPRequest(uint8_t *http_buff, std::size_t len);
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void SentHTTPFailed(const boost::system::error_code & ecode);
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void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
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uint8_t m_recv_buf[8192];
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std::string m_request; //Data left to be sent. TODO: rename to m_send_buf
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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::string m_url; //URL
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std::string m_method; //Method
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std::string m_version; //HTTP version
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std::string m_address; //Address
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std::string m_path; //Path
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int m_port; //Port
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state m_state;//Parsing state
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public:
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HTTPReqHandler(HTTPProxy * parent, std::shared_ptr<boost::asio::ip::tcp::socket> sock) :
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I2PServiceHandler(parent), m_sock(sock)
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{ EnterState(GET_METHOD); }
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I2PServiceHandler(parent), m_sock(sock) {}
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~HTTPReqHandler() { Terminate(); }
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void Handle () { AsyncSockRead(); }
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void Handle () { AsyncSockRead(); } /* overload */
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};
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void HTTPReqHandler::AsyncSockRead()
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@ -84,7 +66,7 @@ namespace proxy {
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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_receive(boost::asio::buffer(m_recv_buf, sizeof(m_recv_buf)),
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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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@ -100,8 +82,6 @@ namespace proxy {
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Done(shared_from_this());
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}
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/* All hope is lost beyond this point */
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//TODO: handle this apropriately
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void HTTPReqHandler::HTTPRequestFailed(const char *message)
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{
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i2p::http::HTTPRes res;
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@ -137,22 +117,6 @@ namespace proxy {
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std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
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}
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void HTTPReqHandler::EnterState(HTTPReqHandler::state nstate)
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{
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m_state = nstate;
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}
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bool HTTPReqHandler::ValidateHTTPRequest()
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{
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if ( m_version != "HTTP/1.0" && m_version != "HTTP/1.1" )
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{
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LogPrint(eLogError, "HTTPProxy: unsupported version: ", m_version);
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HTTPRequestFailed("unsupported HTTP version");
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return false;
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}
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return true;
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}
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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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@ -197,129 +161,110 @@ namespace proxy {
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req.add_header("User-Agent", "MYOB/6.66 (AN/ON)", true); /* privacy */
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}
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bool HTTPReqHandler::CreateHTTPRequest(uint8_t *http_buff, std::size_t len)
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/**
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* @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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i2p::http::HTTPReq req;
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i2p::http::URL url;
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url.parse(m_url);
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m_address = url.host; /* < compatibility */
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m_port = url.port; /* < compatibility */
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if (!m_port) {
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m_port = (url.schema == "https") ? 443 : 80;
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}
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url.schema = "";
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url.host = "";
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m_path = url.to_string(); /* < compatibility */
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if (!ValidateHTTPRequest()) return false;
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std::string b64;
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int req_len = 0;
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/* TODO: notify user */
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req_len = req.parse(m_recv_buf);
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if (req_len == 0)
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return false; /* need more data */
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if (req_len < 0) {
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LogPrint(eLogError, "HTTPProxy: unable to parse request");
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HTTPRequestFailed("invalid 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: ", req.uri);
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url.parse(req.uri);
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/* TODO: show notice page with original link */
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if (ExtractAddressHelper(url, b64)) {
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i2p::client::context.GetAddressBook ().InsertAddress (url.host, b64);
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LogPrint (eLogInfo, "HTTPProxy: added b64 from addresshelper for ", url.host, " to address book");
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std::string message = "added b64 from addresshelper for " + url.host + " to address book";
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LogPrint (eLogInfo, "HTTPProxy: ", message);
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message += ", please reload page";
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HTTPRequestFailed(message.c_str());
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return true; /* request processed */
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}
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SanitizeHTTPRequest(req);
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std::string dest_host = url.host;
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uint16_t dest_port = url.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 = (url.schema == "https") ? 443 : 80;
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}
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/* detect dest_host, set proper 'Host' header in upstream request */
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auto h = req.headers.find("Host");
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if (dest_host != "") {
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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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req.add_header("Host", h, true);
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} else if (h != req.headers.end()) {
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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->second;
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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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} else {
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/* relative url and missing 'Host' header */
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const char *message = "Can't detect destination host from request";
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HTTPRequestFailed(message);
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return true;
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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(m_address, ".i2p"))
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{
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if (!i2p::client::context.GetAddressBook ().GetIdentHash (m_address, identHash)){
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RedirectToJumpService(m_address);
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return false;
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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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RedirectToJumpService(dest_host); /* unknown host */
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return true; /* request processed */
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}
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/* TODO: outproxy handler here */
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} else {
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std::string message = "Host " + url.host + " not inside i2p network, but outproxy support still missing";
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HTTPRequestFailed(message.c_str());
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LogPrint (eLogWarning, "HTTPProxy: ", message);
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return true;
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}
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m_request = m_method;
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m_request.push_back(' ');
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m_request += m_path;
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m_request.push_back(' ');
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m_request += m_version;
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m_request.push_back('\r');
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m_request.push_back('\n');
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m_request.append("Connection: close\r\n");
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// TODO: temporary shortcut. Must be implemented properly
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uint8_t * eol = nullptr;
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bool isEndOfHeader = false;
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while (!isEndOfHeader && len && (eol = (uint8_t *)memchr (http_buff, '\r', len)))
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{
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if (eol)
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{
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*eol = 0; eol++;
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if (strncmp ((const char *)http_buff, "Referer", 7) && strncmp ((const char *)http_buff, "Connection", 10)) // strip out referer and connection
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{
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if (!strncmp ((const char *)http_buff, "User-Agent", 10)) // replace UserAgent
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m_request.append("User-Agent: MYOB/6.66 (AN/ON)");
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else
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m_request.append ((const char *)http_buff);
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m_request.append ("\r\n");
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}
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isEndOfHeader = !http_buff[0];
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auto l = eol - http_buff;
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http_buff = eol;
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len -= l;
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if (len > 0) // \r
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{
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http_buff++;
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len--;
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}
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}
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}
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m_request.append(reinterpret_cast<const char *>(http_buff),len);
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return true;
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}
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bool HTTPReqHandler::HandleData(uint8_t *http_buff, std::size_t len)
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{
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while (len > 0)
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{
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//TODO: fallback to finding HOst: header if needed
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switch (m_state)
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{
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case GET_METHOD:
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switch (*http_buff)
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{
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case ' ': EnterState(GET_HOSTNAME); break;
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default: m_method.push_back(*http_buff); break;
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}
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break;
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case GET_HOSTNAME:
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switch (*http_buff)
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{
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case ' ': EnterState(GET_HTTPV); break;
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default: m_url.push_back(*http_buff); break;
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}
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break;
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case GET_HTTPV:
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switch (*http_buff)
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{
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case '\r': EnterState(GET_HTTPVNL); break;
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default: m_version.push_back(*http_buff); break;
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}
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break;
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case GET_HTTPVNL:
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switch (*http_buff)
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{
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case '\n': EnterState(DONE); break;
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default:
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LogPrint(eLogError, "HTTPProxy: rejected invalid request ending with: ", ((int)*http_buff));
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HTTPRequestFailed("rejected invalid request");
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return false;
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}
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break;
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default:
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LogPrint(eLogError, "HTTPProxy: invalid state: ", m_state);
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HTTPRequestFailed("invalid parser state");
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return false;
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}
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http_buff++;
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len--;
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if (m_state == DONE)
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return CreateHTTPRequest(http_buff,len);
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}
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/* make relative url */
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url.schema = "";
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url.host = "";
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req.uri = url.to_string();
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/* drop original request from recv buffer */
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m_recv_buf.erase(0, req_len);
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/* build new buffer from modified request and data from original request */
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m_send_buf = req.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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/* 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");
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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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{
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LogPrint(eLogWarning, "HTTPProxy: sock recv got error: ", ecode);
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@ -327,17 +272,12 @@ namespace proxy {
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return;
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}
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if (HandleData(m_recv_buf, len))
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{
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if (m_state == DONE)
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{
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LogPrint(eLogDebug, "HTTPProxy: requested: ", m_url);
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GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
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shared_from_this(), std::placeholders::_1), m_address, m_port);
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}
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else
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AsyncSockRead();
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m_recv_buf.append(reinterpret_cast<const char *>(m_recv_chunk), len);
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if (HandleRequest()) {
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m_recv_buf.clear();
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return;
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}
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AsyncSockRead();
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}
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void HTTPReqHandler::SentHTTPFailed(const boost::system::error_code & ecode)
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@ -356,10 +296,10 @@ namespace proxy {
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}
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if (Kill())
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return;
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LogPrint (eLogDebug, "HTTPProxy: New I2PTunnel connection");
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LogPrint (eLogDebug, "HTTPProxy: Created new I2PTunnel stream");
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auto connection = std::make_shared<i2p::client::I2PTunnelConnection>(GetOwner(), m_sock, stream);
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GetOwner()->AddHandler (connection);
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connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_request.data()), m_request.size());
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connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_send_buf.data()), m_send_buf.length());
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Done (shared_from_this());
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}
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