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* HTTPProxy.cpp :

Browse Source 
* migrate to HTTPReq
  * change work with buffers
  * code cleanup
pull/572/head
hagen 8 years ago
parent 642b01bf0d
commit 8deb327b3b
1 changed files with 101 additions and 161 deletions
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262
HTTPProxy.cpp
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@ -34,47 +34,29 @@ namespace proxy {
class HTTPReqHandler: public i2p::client::I2PServiceHandler, public std::enable_shared_from_this<HTTPReqHandler>
{
private:
enum state
{
GET_METHOD,
GET_HOSTNAME,
GET_HTTPV,
GET_HTTPVNL, //TODO: fallback to finding HOst: header if needed
DONE
};
void EnterState(state nstate);
bool HandleData(uint8_t *http_buff, std::size_t len);
bool HandleRequest();
void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
void Terminate();
void AsyncSockRead();
void HTTPRequestFailed(const char *message);
void RedirectToJumpService(std::string & host);
bool ValidateHTTPRequest();
bool ExtractAddressHelper(i2p::http::URL & url, std::string & b64);
void SanitizeHTTPRequest(i2p::http::HTTPReq & req);
bool CreateHTTPRequest(uint8_t *http_buff, std::size_t len);
void SentHTTPFailed(const boost::system::error_code & ecode);
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
uint8_t m_recv_buf[8192];
std::string m_request; //Data left to be sent. TODO: rename to m_send_buf
uint8_t m_recv_chunk[8192];
std::string m_recv_buf; // from client
std::string m_send_buf; // to upstream
std::shared_ptr<boost::asio::ip::tcp::socket> m_sock;
std::string m_url; //URL
std::string m_method; //Method
std::string m_version; //HTTP version
std::string m_address; //Address
std::string m_path; //Path
int m_port; //Port
state m_state;//Parsing state
public:
HTTPReqHandler(HTTPProxy * parent, std::shared_ptr<boost::asio::ip::tcp::socket> sock) :
I2PServiceHandler(parent), m_sock(sock)
{ EnterState(GET_METHOD); }
I2PServiceHandler(parent), m_sock(sock) {}
~HTTPReqHandler() { Terminate(); }
void Handle () { AsyncSockRead(); }
void Handle () { AsyncSockRead(); } /* overload */
};
void HTTPReqHandler::AsyncSockRead()
@ -84,7 +66,7 @@ namespace proxy {
LogPrint(eLogError, "HTTPProxy: no socket for read");
return;
}
m_sock->async_receive(boost::asio::buffer(m_recv_buf, sizeof(m_recv_buf)),
m_sock->async_read_some(boost::asio::buffer(m_recv_chunk, sizeof(m_recv_chunk)),
std::bind(&HTTPReqHandler::HandleSockRecv, shared_from_this(),
std::placeholders::_1, std::placeholders::_2));
}
@ -100,8 +82,6 @@ namespace proxy {
Done(shared_from_this());
}
/* All hope is lost beyond this point */
//TODO: handle this apropriately
void HTTPReqHandler::HTTPRequestFailed(const char *message)
{
i2p::http::HTTPRes res;
@ -137,22 +117,6 @@ namespace proxy {
std::bind(&HTTPReqHandler::SentHTTPFailed, shared_from_this(), std::placeholders::_1));
}
void HTTPReqHandler::EnterState(HTTPReqHandler::state nstate)
{
m_state = nstate;
}
bool HTTPReqHandler::ValidateHTTPRequest()
{
if ( m_version != "HTTP/1.0" && m_version != "HTTP/1.1" )
{
LogPrint(eLogError, "HTTPProxy: unsupported version: ", m_version);
HTTPRequestFailed("unsupported HTTP version");
return false;
}
return true;
}
bool HTTPReqHandler::ExtractAddressHelper(i2p::http::URL & url, std::string & b64)
{
const char *param = "i2paddresshelper=";
@ -197,129 +161,110 @@ namespace proxy {
req.add_header("User-Agent", "MYOB/6.66 (AN/ON)", true); /* privacy */
}
bool HTTPReqHandler::CreateHTTPRequest(uint8_t *http_buff, std::size_t len)
/**
* @brief Try to parse request from @a m_recv_buf
* If parsing success, rebuild request and store to @a m_send_buf
* with remaining data tail
* @return true on processed request or false if more data needed
*/
bool HTTPReqHandler::HandleRequest()
{
std::string b64;
i2p::http::HTTPReq req;
i2p::http::URL url;
url.parse(m_url);
m_address = url.host; /* < compatibility */
m_port = url.port; /* < compatibility */
if (!m_port) {
m_port = (url.schema == "https") ? 443 : 80;
std::string b64;
int req_len = 0;
req_len = req.parse(m_recv_buf);
if (req_len == 0)
return false; /* need more data */
if (req_len < 0) {
LogPrint(eLogError, "HTTPProxy: unable to parse request");
HTTPRequestFailed("invalid request");
return true; /* parse error */
}
url.schema = "";
url.host = "";
m_path = url.to_string(); /* < compatibility */
if (!ValidateHTTPRequest()) return false;
/* TODO: notify user */
/* parsing success, now let's look inside request */
LogPrint(eLogDebug, "HTTPProxy: requested: ", req.uri);
url.parse(req.uri);
/* TODO: show notice page with original link */
if (ExtractAddressHelper(url, b64)) {
i2p::client::context.GetAddressBook ().InsertAddress (url.host, b64);
LogPrint (eLogInfo, "HTTPProxy: added b64 from addresshelper for ", url.host, " to address book");
std::string message = "added b64 from addresshelper for " + url.host + " to address book";
LogPrint (eLogInfo, "HTTPProxy: ", message);
message += ", please reload page";
HTTPRequestFailed(message.c_str());
return true; /* request processed */
}
SanitizeHTTPRequest(req);
std::string dest_host = url.host;
uint16_t dest_port = url.port;
/* always set port, even if missing in request */
if (!dest_port) {
dest_port = (url.schema == "https") ? 443 : 80;
}
/* detect dest_host, set proper 'Host' header in upstream request */
auto h = req.headers.find("Host");
if (dest_host != "") {
/* absolute url, replace 'Host' header */
std::string h = dest_host;
if (dest_port != 0 && dest_port != 80)
h += ":" + std::to_string(dest_port);
req.add_header("Host", h, true);
} else if (h != req.headers.end()) {
/* relative url and 'Host' header provided. transparent proxy mode? */
i2p::http::URL u;
std::string t = "http://" + h->second;
u.parse(t);
dest_host = u.host;
dest_port = u.port;
} else {
/* relative url and missing 'Host' header */
const char *message = "Can't detect destination host from request";
HTTPRequestFailed(message);
return true;
}
/* check dest_host really exists and inside I2P network */
i2p::data::IdentHash identHash;
if (str_rmatch(m_address, ".i2p"))
{
if (!i2p::client::context.GetAddressBook ().GetIdentHash (m_address, identHash)){
RedirectToJumpService(m_address);
return false;
if (str_rmatch(dest_host, ".i2p")) {
if (!i2p::client::context.GetAddressBook ().GetIdentHash (dest_host, identHash)) {
RedirectToJumpService(dest_host); /* unknown host */
return true; /* request processed */
}
/* TODO: outproxy handler here */
} else {
std::string message = "Host " + url.host + " not inside i2p network, but outproxy support still missing";
HTTPRequestFailed(message.c_str());
LogPrint (eLogWarning, "HTTPProxy: ", message);
return true;
}
m_request = m_method;
m_request.push_back(' ');
m_request += m_path;
m_request.push_back(' ');
m_request += m_version;
m_request.push_back('\r');
m_request.push_back('\n');
m_request.append("Connection: close\r\n");
// TODO: temporary shortcut. Must be implemented properly
uint8_t * eol = nullptr;
bool isEndOfHeader = false;
while (!isEndOfHeader && len && (eol = (uint8_t *)memchr (http_buff, '\r', len)))
{
if (eol)
{
*eol = 0; eol++;
if (strncmp ((const char *)http_buff, "Referer", 7) && strncmp ((const char *)http_buff, "Connection", 10)) // strip out referer and connection
{
if (!strncmp ((const char *)http_buff, "User-Agent", 10)) // replace UserAgent
m_request.append("User-Agent: MYOB/6.66 (AN/ON)");
else
m_request.append ((const char *)http_buff);
m_request.append ("\r\n");
}
isEndOfHeader = !http_buff[0];
auto l = eol - http_buff;
http_buff = eol;
len -= l;
if (len > 0) // \r
{
http_buff++;
len--;
}
}
}
m_request.append(reinterpret_cast<const char *>(http_buff),len);
return true;
}
/* make relative url */
url.schema = "";
url.host = "";
req.uri = url.to_string();
bool HTTPReqHandler::HandleData(uint8_t *http_buff, std::size_t len)
{
while (len > 0)
{
//TODO: fallback to finding HOst: header if needed
switch (m_state)
{
case GET_METHOD:
switch (*http_buff)
{
case ' ': EnterState(GET_HOSTNAME); break;
default: m_method.push_back(*http_buff); break;
}
break;
case GET_HOSTNAME:
switch (*http_buff)
{
case ' ': EnterState(GET_HTTPV); break;
default: m_url.push_back(*http_buff); break;
}
break;
case GET_HTTPV:
switch (*http_buff)
{
case '\r': EnterState(GET_HTTPVNL); break;
default: m_version.push_back(*http_buff); break;
}
break;
case GET_HTTPVNL:
switch (*http_buff)
{
case '\n': EnterState(DONE); break;
default:
LogPrint(eLogError, "HTTPProxy: rejected invalid request ending with: ", ((int)*http_buff));
HTTPRequestFailed("rejected invalid request");
return false;
}
break;
default:
LogPrint(eLogError, "HTTPProxy: invalid state: ", m_state);
HTTPRequestFailed("invalid parser state");
return false;
}
http_buff++;
len--;
if (m_state == DONE)
return CreateHTTPRequest(http_buff,len);
}
/* drop original request from recv buffer */
m_recv_buf.erase(0, req_len);
/* build new buffer from modified request and data from original request */
m_send_buf = req.to_string();
m_send_buf.append(m_recv_buf);
/* connect to destination */
LogPrint(eLogDebug, "HTTPProxy: connecting to host ", dest_host, ":", dest_port);
GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
shared_from_this(), std::placeholders::_1), dest_host, dest_port);
return true;
}
/* 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");
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);
@ -327,17 +272,12 @@ namespace proxy {
return;
}
if (HandleData(m_recv_buf, len))
{
if (m_state == DONE)
{
LogPrint(eLogDebug, "HTTPProxy: requested: ", m_url);
GetOwner()->CreateStream (std::bind (&HTTPReqHandler::HandleStreamRequestComplete,
shared_from_this(), std::placeholders::_1), m_address, m_port);
}
else
AsyncSockRead();
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)
@ -356,10 +296,10 @@ namespace proxy {
}
if (Kill())
return;
LogPrint (eLogDebug, "HTTPProxy: New I2PTunnel connection");
LogPrint (eLogDebug, "HTTPProxy: Created new I2PTunnel stream");
auto connection = std::make_shared<i2p::client::I2PTunnelConnection>(GetOwner(), m_sock, stream);
GetOwner()->AddHandler (connection);
connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_request.data()), m_request.size());
connection->I2PConnect (reinterpret_cast<const uint8_t*>(m_send_buf.data()), m_send_buf.length());
Done (shared_from_this());
}

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