I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#include "SOCKS.h"
#include "Identity.h"
#include "NetDb.h"
#include "Destination.h"
#include <cstring>
#include <stdexcept>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/bind.hpp>
namespace i2p
{
namespace proxy
{
const uint8_t socks_leaseset_timeout = 10;
const uint8_t socks_timeout = 60;
void SOCKS4AHandler::AsyncSockRead()
{
LogPrint("--- socks4a async sock read");
if(m_sock) {
if (m_state == INITIAL) {
m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
boost::bind(&SOCKS4AHandler::HandleSockRecv, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
} else {
m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
boost::bind(&SOCKS4AHandler::HandleSockForward, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
} else {
LogPrint("--- socks4a no socket for read");
}
}
void SOCKS4AHandler::AsyncStreamRead()
{
LogPrint("--- socks4a async stream read");
if (m_stream) {
m_stream->AsyncReceive(
boost::asio::buffer(m_stream_buff, socks_buffer_size),
boost::bind(&SOCKS4AHandler::HandleStreamRecv, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred), socks_timeout);
} else {
LogPrint("--- socks4a no stream for read");
}
}
void SOCKS4AHandler::Terminate() {
CloseStream();
CloseSock();
delete this; // ew
}
void SOCKS4AHandler::SocksFailed()
{
LogPrint("--- socks4a failed");
m_sock->send(boost::asio::buffer("\x00\x5b 12345"));
Terminate();
}
void SOCKS4AHandler::CloseSock()
{
if (m_sock) {
LogPrint("--- socks4a close sock");
m_sock->close();
delete m_sock;
m_sock = nullptr;
}
}
void SOCKS4AHandler::CloseStream()
{
if (m_stream) {
LogPrint("--- socks4a close stream");
delete m_stream;
m_stream = nullptr;
}
}
const size_t socks_hostname_size = 1024;
const size_t socks_ident_size = 1024;
const size_t destb32_len = 52;
void SOCKS4AHandler::HandleSockForward(const boost::system::error_code & ecode, std::size_t len)
{
if(ecode) {
LogPrint("--- socks4a forward got error: ", ecode);
Terminate();
return;
}
LogPrint("--- socks4a sock forward: ", len);
m_stream->Send(m_sock_buff, len);
}
void SOCKS4AHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
{
LogPrint("--- socks4a sock recv: ", len);
if(ecode) {
LogPrint(" --- sock recv got error: ", ecode);
Terminate();
return;
}
if (m_state == INITIAL) {
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;
// get port
uint16_t port = 0;
uint16_t idx1 = 0;
uint16_t idx2 = 0;
LogPrint("--- socks4a state initial ", len);
// check valid request
if( m_sock_buff[0] != 4 || m_sock_buff[1] != 1 || m_sock_buff[len-1] ) {
LogPrint("--- socks4a rejected invalid");
SocksFailed();
return;
}
// get port
port = m_sock_buff[3] | m_sock_buff[2] << 8;
// read ident
do {
LogPrint("--- socks4a ", (int) m_sock_buff[9+idx1]);
identbuff[idx1] = m_sock_buff[8+idx1];
} while( identbuff[idx1++] && idx1 < socks_ident_size );
LogPrint("--- socks4a ident ", identbuff);
// read hostname
do {
hostbuff[idx2] = m_sock_buff[8+idx1+idx2];
} while( hostbuff[idx2++] && idx2 < socks_hostname_size );
LogPrint("--- socks4a requested ", hostbuff, ":" , port);
dest = std::string(hostbuff);
if(dest.find(".b32.i2p") == std::string::npos) {
LogPrint("--- socks4a invalid hostname: ", dest);
SocksFailed();
return;
}
if ( i2p::data::Base32ToByteStream(hostbuff, destb32_len, (uint8_t *) m_dest, 32) != 32 ) {
LogPrint("--- sock4a invalid b32: ", dest);
}
LogPrint("--- sock4a find lease set");
m_ls = i2p::data::netdb.FindLeaseSet(m_dest);
if (!m_ls || m_ls->HasNonExpiredLeases()) {
i2p::data::netdb.Subscribe(m_dest);
m_ls_timer.expires_from_now(boost::posix_time::seconds(socks_leaseset_timeout));
m_ls_timer.async_wait(boost::bind(&SOCKS4AHandler::LeaseSetTimeout, this, boost::asio::placeholders::error));
} else {
ConnectionSuccess();
}
} else {
LogPrint("--- socks4a state?? ", m_state);
}
}
void SOCKS4AHandler::HandleStreamRecv(const boost::system::error_code & ecode, std::size_t len)
{
if(ecode) { LogPrint("--- socks4a stream recv error: ", ecode); m_state = END; }
switch(m_state) {
case INITIAL:
case END:
Terminate();
return;
case OKAY:
LogPrint("--- socks4a stream recv ", len);
boost::asio::async_write(*m_sock, boost::asio::buffer(m_stream_buff, len),
boost::bind(&SOCKS4AHandler::StreamWrote, this,
boost::asio::placeholders::error));
}
}
void SOCKS4AHandler::SockWrote(const boost::system::error_code & ecode)
{
LogPrint("--- socks4a sock wrote");
if(ecode) { LogPrint("--- socks4a SockWrote error: ",ecode); }
else { AsyncSockRead(); }
}
void SOCKS4AHandler::StreamWrote(const boost::system::error_code & ecode)
{
LogPrint("--- socks4a stream wrote");
if(ecode) { LogPrint("--- socks4a StreamWrote error: ",ecode); }
else { AsyncStreamRead(); }
}
void SOCKS4AHandler::LeaseSetTimeout(const boost::system::error_code & ecode)
{
m_ls = i2p::data::netdb.FindLeaseSet(m_dest);
if(m_ls) {
ConnectionSuccess();
} else {
LogPrint("--- socks4a ls timeout");
SocksFailed();
}
}
void SOCKS4AHandler::ConnectionSuccess()
{
LogPrint("--- socks4a connection success");
boost::asio::async_write(*m_sock, boost::asio::buffer("\x00\x5a 12345"),
boost::bind(&SOCKS4AHandler::SentConnectionSuccess, this,
boost::asio::placeholders::error));
}
void SOCKS4AHandler::SentConnectionSuccess(const boost::system::error_code & ecode)
{
LogPrint("--- socks4a making connection");
m_stream = i2p::stream::CreateStream(*m_ls);
m_state = OKAY;
LogPrint("--- socks4a state is ", m_state);
AsyncSockRead();
AsyncStreamRead();
}
void SOCKS4AServer::Run()
{
LogPrint("--- socks4a run");
m_run = true;
while(m_run) {
try {
m_ios.run();
} catch (std::runtime_error & exc) {
LogPrint("--- socks4a exception: ", exc.what());
}
}
}
void SOCKS4AServer::Accept()
{
m_new_sock = new boost::asio::ip::tcp::socket(m_ios);
m_acceptor.async_accept(*m_new_sock,
boost::bind(
&SOCKS4AServer::HandleAccept, this, boost::asio::placeholders::error));
}
void SOCKS4AServer::Start()
{
m_run = true;
m_thread = new std::thread(std::bind(&SOCKS4AServer::Run, this));
m_acceptor.listen();
Accept();
}
void SOCKS4AServer::Stop()
{
m_acceptor.close();
m_run = false;
m_ios.stop();
if (m_thread) {
m_thread->join();
delete m_thread;
m_thread = nullptr;
}
}
void SOCKS4AServer::HandleAccept(const boost::system::error_code & ecode)
{
if (!ecode) {
LogPrint("--- socks4a accepted");
new SOCKS4AHandler(&m_ios, m_new_sock);
Accept();
}
}
}
}