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Merge pull request #132 from klondi/httpproxy 

SOCKSProxy
pull/133/head
orignal 10 years ago
parent
8a293f45fa 27d510d1b7
commit
729cc4330e
2 changed files with 187 additions and 101 deletions
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  1. 216
      SOCKS.cpp
  2. 72
      SOCKS.h

216
SOCKS.cpp
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@ -5,6 +5,7 @@ @@ -5,6 +5,7 @@
#include "ClientContext.h"
#include "I2PEndian.h"
#include <cstring>
#include <cassert>
namespace i2p
{
@ -15,17 +16,13 @@ namespace proxy @@ -15,17 +16,13 @@ namespace proxy
void SOCKS4AHandler::AsyncSockRead()
{
LogPrint("--- socks4a async sock read");
LogPrint(eLogDebug,"--- SOCKS async sock read");
if(m_sock) {
if (m_state == INITIAL) {
m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
std::bind(&SOCKS4AHandler::HandleSockRecv, this,
std::placeholders::_1, std::placeholders::_2));
} else {
LogPrint("--- socks4a state?? ", m_state);
}
m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
std::bind(&SOCKS4AHandler::HandleSockRecv, this,
std::placeholders::_1, std::placeholders::_2));
} else {
LogPrint("--- socks4a no socket for read");
LogPrint(eLogError,"--- SOCKS no socket for read");
}
}
@ -37,7 +34,7 @@ namespace proxy @@ -37,7 +34,7 @@ namespace proxy
void SOCKS4AHandler::SocksFailed()
{
LogPrint("--- socks4a failed");
LogPrint(eLogWarning,"--- SOCKS failed");
//TODO: send the right response
boost::asio::async_write(*m_sock, boost::asio::buffer("\x00\x5b 12345"),
std::bind(&SOCKS4AHandler::SentSocksFailed, this,
@ -47,7 +44,7 @@ namespace proxy @@ -47,7 +44,7 @@ namespace proxy
void SOCKS4AHandler::CloseSock()
{
if (m_sock) {
LogPrint("--- socks4a close sock");
LogPrint(eLogDebug,"--- SOCKS close sock");
m_sock->close();
delete m_sock;
m_sock = nullptr;
@ -57,7 +54,7 @@ namespace proxy @@ -57,7 +54,7 @@ namespace proxy
void SOCKS4AHandler::CloseStream()
{
if (m_stream) {
LogPrint("--- socks4a close stream");
LogPrint(eLogDebug,"--- SOCKS close stream");
m_stream.reset ();
}
}
@ -66,78 +63,147 @@ namespace proxy @@ -66,78 +63,147 @@ namespace proxy
const size_t socks_ident_size = 1024;
const size_t destb32_len = 52;
void SOCKS4AHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
std::size_t SOCKS4AHandler::HandleData(uint8_t *sock_buff, std::size_t len)
{
LogPrint("--- socks4a sock recv: ", len);
//TODO: we may not have received all the data :(
if(ecode) {
LogPrint(" --- sock recv got error: ", ecode);
Terminate();
return;
assert(len); // This should always be called with a least a byte left to parse
switch (m_state) {
case GET_VERSION:
return HandleVersion(sock_buff);
case SOCKS4A:
return HandleSOCKS4A(sock_buff,len);
default:
LogPrint(eLogError,"--- SOCKS state?? ", m_state);
Terminate();
return 0;
}
}
char hostbuff[socks_hostname_size];
char identbuff[socks_ident_size];
std::memset(hostbuff, 0, sizeof(hostbuff));
std::memset(identbuff, 0, sizeof(hostbuff));
std::string dest;
uint16_t port = 0;
uint32_t address = 0;
uint16_t idx1 = 0;
uint16_t idx2 = 0;
LogPrint(eLogDebug,"--- socks4a state initial ", len);
// check valid request
if( m_sock_buff[0] != 4 || m_sock_buff[1] != 1 || m_sock_buff[len-1] ) {
LogPrint(eLogError,"--- socks4a rejected invalid");
SocksFailed();
return;
std::size_t SOCKS4AHandler::HandleVersion(uint8_t *sock_buff)
{
switch (*sock_buff) {
case 4:
m_state = SOCKS4A; // Switch to the 4a handler
m_pstate = GET4A_COMMAND; //Initialize the parser at the right position
return 1;
default:
LogPrint(eLogError,"--- SOCKS rejected invalid version", ((int)*sock_buff));
Terminate();
return 0;
}
}
// get port
port = bufbe16toh(m_sock_buff + 2);
// get address
address = bufbe32toh(m_sock_buff + 4);
std::size_t SOCKS4AHandler::HandleSOCKS4A(uint8_t *sock_buff, std::size_t len)
{
std::size_t rv = 0;
while (len > 0) {
rv++;
switch (m_pstate)
{
case GET4A_COMMAND:
if ( *sock_buff != 1 ) {
//TODO: we need to support binds and other shit!
LogPrint(eLogError,"--- SOCKS4a unsupported command", ((int)*sock_buff));
SocksFailed();
return 0;
}
m_pstate = GET4A_PORT1;
break;
case GET4A_PORT1:
m_port = ((uint16_t)*sock_buff) << 8;
m_pstate = GET4A_PORT2;
break;
case GET4A_PORT2:
m_port |= ((uint16_t)*sock_buff);
m_pstate = GET4A_IP1;
break;
case GET4A_IP1:
m_ip = ((uint32_t)*sock_buff) << 24;
m_pstate = GET4A_IP2;
break;
case GET4A_IP2:
m_ip |= ((uint32_t)*sock_buff) << 16;
m_pstate = GET4A_IP3;
break;
case GET4A_IP3:
m_ip |= ((uint32_t)*sock_buff) << 8;
m_pstate = GET4A_IP4;
break;
case GET4A_IP4:
m_ip |= ((uint32_t)*sock_buff);
m_pstate = GET4A_IDENT;
if( m_ip == 0 || m_ip > 255 ) {
LogPrint(eLogError,"--- SOCKS4a rejected because it's actually SOCKS4");
SocksFailed();
return 0;
}
break;
case GET4A_IDENT:
if (!*sock_buff)
m_pstate = GET4A_HOST;
break;
case GET4A_HOST:
if (!*sock_buff) {
m_pstate = DONE;
m_state = READY;
return rv;
}
if (m_destination.size() > HOST_NAME_MAX) {
LogPrint(eLogError,"--- SOCKS4a destination is too large ");
SocksFailed();
return 0;
}
m_destination.push_back(*sock_buff);
break;
default:
LogPrint(eLogError,"--- SOCKS4a parse state?? ", m_pstate);
Terminate();
return 0;
}
sock_buff++;
len--;
}
return rv;
}
// check valid request
if( address == 0 || address > 255 ) {
LogPrint(eLogError,"--- socks4a rejected because it's actually socks4");
SocksFailed();
void SOCKS4AHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
{
LogPrint(eLogDebug,"--- SOCKS sock recv: ", len);
if(ecode) {
LogPrint(eLogWarning," --- SOCKS sock recv got error: ", ecode);
Terminate();
return;
}
// read ident
do {
LogPrint(eLogDebug,"--- socks4a ", (int) m_sock_buff[9+idx1]);
identbuff[idx1] = m_sock_buff[8+idx1];
} while( identbuff[idx1++] && idx1 < socks_ident_size );
LogPrint(eLogInfo,"--- socks4a ident ", identbuff);
// read hostname
do {
hostbuff[idx2] = m_sock_buff[8+idx1+idx2];
} while( hostbuff[idx2++] && idx2 < socks_hostname_size );
std::size_t pos = 0;
while (pos != len && m_state != READY) {
assert(pos < len); //We are overflowing the buffer otherwise
std::size_t rv = HandleData(m_sock_buff + pos, len - pos);
if (!rv) return; //Something went wrong die misserably
pos += rv;
}
LogPrint(eLogInfo,"--- socks4a requested ", hostbuff, ":" , port);
if (m_state == READY) {
LogPrint(eLogInfo,"--- SOCKS requested ", m_destination, ":" , m_port);
if (pos != len) {
LogPrint(eLogError,"--- SOCKS rejected because be can't handle extra data");
SocksFailed();
return ;
}
if(m_destination.find(".i2p") == std::string::npos) {
LogPrint(eLogError,"--- SOCKS invalid hostname: ", m_destination);
SocksFailed();
return;
}
dest = std::string(hostbuff);
if(dest.find(".i2p") == std::string::npos) {
LogPrint("--- socks4a invalid hostname: ", dest);
SocksFailed();
return;
m_parent->GetLocalDestination ()->CreateStream (
std::bind (&SOCKS4AHandler::HandleStreamRequestComplete,
this, std::placeholders::_1), m_destination, m_port);
}
m_parent->GetLocalDestination ()->CreateStream (
std::bind (&SOCKS4AHandler::HandleStreamRequestComplete,
this, std::placeholders::_1), dest);
}
void SOCKS4AHandler::ConnectionSuccess()
{
LogPrint(eLogInfo,"--- socks4a connection success");
LogPrint(eLogInfo,"--- SOCKS connection success");
//TODO: send the right response
boost::asio::async_write(*m_sock, boost::asio::buffer("\x00\x5a 12345"),
std::bind(&SOCKS4AHandler::SentConnectionSuccess, this,
@ -151,7 +217,7 @@ namespace proxy @@ -151,7 +217,7 @@ namespace proxy
}
else
{
LogPrint (eLogError,"--- socks4a Closing socket after sending failure because: ", ecode.message ());
LogPrint (eLogError,"--- SOCKS Closing socket after sending failure because: ", ecode.message ());
Terminate();
}
}
@ -159,14 +225,14 @@ namespace proxy @@ -159,14 +225,14 @@ namespace proxy
void SOCKS4AHandler::SentConnectionSuccess(const boost::system::error_code & ecode)
{
if (!ecode) {
LogPrint (eLogInfo,"--- socks4a New I2PTunnel connection");
LogPrint (eLogInfo,"--- SOCKS New I2PTunnel connection");
auto connection = std::make_shared<i2p::client::I2PTunnelConnection>((i2p::client::I2PTunnel *)m_parent, m_sock, m_stream);
m_parent->AddConnection (connection);
connection->I2PConnect ();
}
else
{
LogPrint (eLogError,"--- socks4a Closing socket after sending success because: ", ecode.message ());
LogPrint (eLogError,"--- SOCKS Closing socket after sending success because: ", ecode.message ());
Terminate();
}
}
@ -180,7 +246,7 @@ namespace proxy @@ -180,7 +246,7 @@ namespace proxy
}
else
{
LogPrint (eLogError,"--- socks4a Issue when creating the stream, check the previous warnings for more info.");
LogPrint (eLogError,"--- SOCKS Issue when creating the stream, check the previous warnings for more info.");
SocksFailed();
}
}
@ -210,13 +276,13 @@ namespace proxy @@ -210,13 +276,13 @@ namespace proxy
{
if (!ecode)
{
LogPrint(eLogDebug,"--- socks4a accepted");
LogPrint(eLogDebug,"--- SOCKS accepted");
new SOCKS4AHandler(this, socket);
Accept();
}
else
{
LogPrint (eLogError,"--- socks4a Closing socket on accept because: ", ecode.message ());
LogPrint (eLogError,"--- SOCKS Closing socket on accept because: ", ecode.message ());
delete socket;
}
}

72
SOCKS.h
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@ -1,6 +1,7 @@ @@ -1,6 +1,7 @@
#ifndef SOCKS4A_H__
#define SOCKS4A_H__
#include <climits>
#include <memory>
#include <boost/asio.hpp>
#include "Identity.h"
@ -18,39 +19,58 @@ namespace proxy @@ -18,39 +19,58 @@ namespace proxy
class SOCKS4AHandler {
private:
enum state {
INITIAL,
OKAY,
END
};
void GotClientRequest(boost::system::error_code & ecode, std::string & host, uint16_t port);
void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
void Terminate();
void CloseSock();
void CloseStream();
void AsyncSockRead();
void SocksFailed();
void SentSocksFailed(const boost::system::error_code & ecode);
void SentConnectionSuccess(const boost::system::error_code & ecode);
void ConnectionSuccess();
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
enum state {
GET_VERSION,
SOCKS4A,
READY
};
enum parseState {
GET4A_COMMAND,
GET4A_PORT1,
GET4A_PORT2,
GET4A_IP1,
GET4A_IP2,
GET4A_IP3,
GET4A_IP4,
GET4A_IDENT,
GET4A_HOST,
DONE
};
void GotClientRequest(boost::system::error_code & ecode, std::string & host, uint16_t port);
std::size_t HandleData(uint8_t *sock_buff, std::size_t len);
std::size_t HandleVersion(uint8_t *sock_buff);
std::size_t HandleSOCKS4A(uint8_t *sock_buff, std::size_t len);
void HandleSockRecv(const boost::system::error_code & ecode, std::size_t bytes_transfered);
void Terminate();
void CloseSock();
void CloseStream();
void AsyncSockRead();
void SocksFailed();
void SentSocksFailed(const boost::system::error_code & ecode);
void SentConnectionSuccess(const boost::system::error_code & ecode);
void ConnectionSuccess();
void HandleStreamRequestComplete (std::shared_ptr<i2p::stream::Stream> stream);
uint8_t m_sock_buff[socks_buffer_size];
uint8_t m_sock_buff[socks_buffer_size];
SOCKS4AServer * m_parent;
boost::asio::ip::tcp::socket * m_sock;
std::shared_ptr<i2p::stream::Stream> m_stream;
state m_state;
SOCKS4AServer * m_parent;
boost::asio::ip::tcp::socket * m_sock;
std::shared_ptr<i2p::stream::Stream> m_stream;
state m_state;
parseState m_pstate;
uint8_t m_command;
uint16_t m_port;
uint32_t m_ip;
std::string m_destination;
public:
SOCKS4AHandler(SOCKS4AServer * parent, boost::asio::ip::tcp::socket * sock) :
m_parent(parent), m_sock(sock), m_stream(nullptr), m_state(INITIAL)
{ AsyncSockRead(); }
m_parent(parent), m_sock(sock), m_stream(nullptr), m_state(GET_VERSION)
{ AsyncSockRead(); m_destination.reserve(HOST_NAME_MAX+1); }
~SOCKS4AHandler() { CloseSock(); CloseStream(); }
bool isComplete() { return m_state == END; }
};
class SOCKS4AServer: public i2p::client::I2PTunnel

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