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https://github.com/PurpleI2P/i2pd.git
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add socks proxy
This commit is contained in:
jeff
parent
9b4dd95b1c
commit
e832002795
4 changed files with 395 additions and 8 deletions
282
SOCKS.cpp
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282
SOCKS.cpp
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#include "SOCKS.h"
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#include "Identity.h"
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#include "NetDb.h"
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#include <cstring>
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#include <stdexcept>
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#include <boost/date_time/posix_time/posix_time.hpp>
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#include <boost/bind.hpp>
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namespace i2p
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{
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namespace proxy
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{
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constexpr uint8_t socks_leaseset_timeout = 10;
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constexpr uint8_t socks_timeout = 60;
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void SOCKS4AHandler::AsyncSockRead()
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{
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LogPrint("--- socks4a async sock read");
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if(m_sock) {
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if (m_state == INITIAL) {
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m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
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boost::bind(&SOCKS4AHandler::HandleSockRecv, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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} else {
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m_sock->async_receive(boost::asio::buffer(m_sock_buff, socks_buffer_size),
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boost::bind(&SOCKS4AHandler::HandleSockForward, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred));
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}
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} else {
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LogPrint("--- socks4a no socket for read");
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}
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}
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void SOCKS4AHandler::AsyncStreamRead()
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{
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LogPrint("--- socks4a async stream read");
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if (m_stream) {
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m_stream->AsyncReceive(
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boost::asio::buffer(m_stream_buff, socks_buffer_size),
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boost::bind(&SOCKS4AHandler::HandleStreamRecv, this,
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred), socks_timeout);
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} else {
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LogPrint("--- socks4a no stream for read");
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}
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}
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void SOCKS4AHandler::Terminate() {
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CloseStream();
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CloseSock();
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delete this; // ew
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}
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void SOCKS4AHandler::SocksFailed()
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{
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LogPrint("--- socks4a failed");
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m_sock->send(boost::asio::buffer("\x00\x5b 12345"));
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Terminate();
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}
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void SOCKS4AHandler::CloseSock()
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{
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if (m_sock) {
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LogPrint("--- socks4a close sock");
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m_sock->close();
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delete m_sock;
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m_sock = nullptr;
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}
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}
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void SOCKS4AHandler::CloseStream()
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{
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if (m_stream) {
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LogPrint("--- socks4a close stream");
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delete m_stream;
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m_stream = nullptr;
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}
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}
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constexpr size_t socks_hostname_size = 1024;
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constexpr size_t socks_ident_size = 1024;
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constexpr size_t destb32_len = 52;
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void SOCKS4AHandler::HandleSockForward(const boost::system::error_code & ecode, std::size_t len)
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{
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if(ecode) {
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LogPrint("--- socks4a forward got error: ", ecode);
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Terminate();
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return;
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}
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LogPrint("--- socks4a sock forward: ", len);
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m_stream->Send(m_sock_buff, len, 1);
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}
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void SOCKS4AHandler::HandleSockRecv(const boost::system::error_code & ecode, std::size_t len)
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{
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LogPrint("--- socks4a sock recv: ", len);
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if(ecode) {
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LogPrint(" --- sock recv got error: ", ecode);
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Terminate();
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return;
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}
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if (m_state == INITIAL) {
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char hostbuff[socks_hostname_size];
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char identbuff[socks_ident_size];
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std::memset(hostbuff, 0, sizeof(hostbuff));
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std::memset(identbuff, 0, sizeof(hostbuff));
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std::string dest;
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// get port
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uint16_t port = 0;
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uint16_t idx1 = 0;
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uint16_t idx2 = 0;
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LogPrint("--- socks4a state initial ", len);
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// check valid request
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if( m_sock_buff[0] != 4 || m_sock_buff[1] != 1 || m_sock_buff[len-1] ) {
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LogPrint("--- socks4a rejected invalid");
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SocksFailed();
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return;
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}
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// get port
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port = m_sock_buff[3] | m_sock_buff[2] << 8;
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// read ident
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do {
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LogPrint("--- socks4a ", (int) m_sock_buff[9+idx1]);
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identbuff[idx1] = m_sock_buff[8+idx1];
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} while( identbuff[idx1++] && idx1 < socks_ident_size );
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LogPrint("--- socks4a ident ", identbuff);
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// read hostname
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do {
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hostbuff[idx2] = m_sock_buff[8+idx1+idx2];
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} while( hostbuff[idx2++] && idx2 < socks_hostname_size );
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LogPrint("--- socks4a requested ", hostbuff, ":" , port);
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dest = std::string(hostbuff);
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if(dest.find(".b32.i2p") == std::string::npos) {
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LogPrint("--- socks4a invalid hostname: ", dest);
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SocksFailed();
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return;
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}
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if ( i2p::data::Base32ToByteStream(hostbuff, destb32_len, (uint8_t *) m_dest, 32) != 32 ) {
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LogPrint("--- sock4a invalid b32: ", dest);
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}
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LogPrint("--- sock4a find lease set");
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m_ls = i2p::data::netdb.FindLeaseSet(m_dest);
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if (!m_ls || m_ls->HasNonExpiredLeases()) {
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i2p::data::netdb.Subscribe(m_dest);
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m_ls_timer.expires_from_now(boost::posix_time::seconds(socks_leaseset_timeout));
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m_ls_timer.async_wait(boost::bind(&SOCKS4AHandler::LeaseSetTimeout, this, boost::asio::placeholders::error));
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} else {
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ConnectionSuccess();
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}
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} else {
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LogPrint("--- socks4a state?? ", m_state);
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}
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}
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void SOCKS4AHandler::HandleStreamRecv(const boost::system::error_code & ecode, std::size_t len)
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{
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if(ecode) { LogPrint("--- socks4a stream recv error: ", ecode); m_state = END; }
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switch(m_state) {
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case INITIAL:
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case END:
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Terminate();
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return;
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case OKAY:
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LogPrint("--- socks4a stream recv ", len);
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boost::asio::async_write(*m_sock, boost::asio::buffer(m_stream_buff, len),
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boost::bind(&SOCKS4AHandler::StreamWrote, this,
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boost::asio::placeholders::error));
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}
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}
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void SOCKS4AHandler::SockWrote(const boost::system::error_code & ecode)
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{
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LogPrint("--- socks4a sock wrote");
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if(ecode) { LogPrint("--- socks4a SockWrote error: ",ecode); }
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else { AsyncSockRead(); }
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}
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void SOCKS4AHandler::StreamWrote(const boost::system::error_code & ecode)
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{
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LogPrint("--- socks4a stream wrote");
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if(ecode) { LogPrint("--- socks4a StreamWrote error: ",ecode); }
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else { AsyncStreamRead(); }
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}
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void SOCKS4AHandler::LeaseSetTimeout(const boost::system::error_code & ecode)
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{
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m_ls = i2p::data::netdb.FindLeaseSet(m_dest);
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if(m_ls) {
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ConnectionSuccess();
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} else {
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LogPrint("--- socks4a ls timeout");
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SocksFailed();
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}
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}
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void SOCKS4AHandler::ConnectionSuccess()
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{
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LogPrint("--- socks4a connection success");
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boost::asio::async_write(*m_sock, boost::asio::buffer("\x00\x5a 12345"),
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boost::bind(&SOCKS4AHandler::SentConnectionSuccess, this,
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boost::asio::placeholders::error));
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}
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void SOCKS4AHandler::SentConnectionSuccess(const boost::system::error_code & ecode)
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{
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LogPrint("--- socks4a making connection");
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m_stream = i2p::stream::CreateStream(*m_ls);
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m_state = OKAY;
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LogPrint("--- socks4a state is ", m_state);
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AsyncSockRead();
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AsyncStreamRead();
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}
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void SOCKS4AServer::Run()
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{
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LogPrint("--- socks4a run");
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m_run = true;
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while(m_run) {
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try {
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m_ios.run();
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} catch (std::runtime_error & exc) {
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LogPrint("--- socks4a exception: ", exc.what());
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}
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}
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}
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void SOCKS4AServer::Accept()
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{
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m_new_sock = new boost::asio::ip::tcp::socket(m_ios);
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m_acceptor.async_accept(*m_new_sock,
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boost::bind(
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&SOCKS4AServer::HandleAccept, this, boost::asio::placeholders::error));
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}
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void SOCKS4AServer::Start()
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{
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m_run = true;
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m_thread = new std::thread(std::bind(&SOCKS4AServer::Run, this));
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m_acceptor.listen();
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Accept();
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}
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void SOCKS4AServer::Stop()
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{
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m_acceptor.close();
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m_run = false;
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m_ios.stop();
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if (m_thread) {
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m_thread->join();
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delete m_thread;
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m_thread = nullptr;
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}
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}
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void SOCKS4AServer::HandleAccept(const boost::system::error_code & ecode)
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{
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if (!ecode) {
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LogPrint("--- socks4a accepted");
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new SOCKS4AHandler(&m_ios, m_new_sock);
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Accept();
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}
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}
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}
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}
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