premiere-libtorrent/src/udp_socket.cpp

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#include "libtorrent/udp_socket.hpp"
#include "libtorrent/connection_queue.hpp"
#include <stdlib.h>
#include <boost/bind.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/array.hpp>
#include <asio/read.hpp>
using namespace libtorrent;
udp_socket::udp_socket(asio::io_service& ios, udp_socket::callback_t const& c
, connection_queue& cc)
: m_callback(c)
, m_ipv4_sock(ios)
, m_ipv6_sock(ios)
, m_bind_port(0)
, m_socks5_sock(ios)
, m_connection_ticket(-1)
, m_cc(cc)
, m_resolver(ios)
, m_tunnel_packets(false)
{
}
void udp_socket::send(udp::endpoint const& ep, char const* p, int len, asio::error_code& ec)
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{
if (m_tunnel_packets)
{
// send udp packets through SOCKS5 server
wrap(ep, p, len, ec);
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return;
}
if (ep.address().is_v4() && m_ipv4_sock.is_open())
m_ipv4_sock.send_to(asio::buffer(p, len), ep, 0, ec);
else
m_ipv6_sock.send_to(asio::buffer(p, len), ep, 0, ec);
}
void udp_socket::on_read(udp::socket* s, asio::error_code const& e, std::size_t bytes_transferred)
{
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if (e) return;
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if (!m_callback) return;
if (s == &m_ipv4_sock)
{
#ifndef BOOST_NO_EXCEPTIONS
try {
#endif
if (m_tunnel_packets && m_v4_ep == m_proxy_addr)
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unwrap(m_v4_buf, bytes_transferred);
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else
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m_callback(m_v4_ep, m_v4_buf, bytes_transferred);
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#ifndef BOOST_NO_EXCEPTIONS
} catch(std::exception&) {}
#endif
s->async_receive_from(asio::buffer(m_v4_buf, sizeof(m_v4_buf))
, m_v4_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
else
{
#ifndef BOOST_NO_EXCEPTIONS
try {
#endif
if (m_tunnel_packets && m_v6_ep == m_proxy_addr)
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unwrap(m_v6_buf, bytes_transferred);
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else
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m_callback(m_v6_ep, m_v6_buf, bytes_transferred);
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#ifndef BOOST_NO_EXCEPTIONS
} catch(std::exception&) {}
#endif
s->async_receive_from(asio::buffer(m_v6_buf, sizeof(m_v6_buf))
, m_v6_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
}
void udp_socket::wrap(udp::endpoint const& ep, char const* p, int len, asio::error_code& ec)
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{
using namespace libtorrent::detail;
char header[20];
char* h = header;
write_uint16(0, h); // reserved
write_uint8(0, h); // fragment
write_uint8(ep.address().is_v4()?1:4, h); // atyp
write_address(ep.address(), h);
write_uint16(ep.port(), h);
boost::array<asio::const_buffer, 2> iovec;
iovec[0] = asio::const_buffer(header, h - header);
iovec[1] = asio::const_buffer(p, len);
if (m_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
m_ipv4_sock.send_to(iovec, m_proxy_addr, 0, ec);
else
m_ipv6_sock.send_to(iovec, m_proxy_addr, 0, ec);
}
// unwrap the UDP packet from the SOCKS5 header
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void udp_socket::unwrap(char const* buf, int size)
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{
using namespace libtorrent::detail;
// the minimum socks5 header size
if (size <= 10) return;
char const* p = buf;
p += 2; // reserved
int frag = read_uint8(p);
// fragmentation is not supported
if (frag != 0) return;
udp::endpoint sender;
int atyp = read_uint8(p);
if (atyp == 1)
{
// IPv4
sender.address(address_v4(read_uint32(p)));
sender.port(read_uint16(p));
}
else if (atyp == 4)
{
// IPv6
TORRENT_ASSERT(false && "not supported yet");
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}
else
{
// domain name not supported
return;
}
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m_callback(sender, p, size - (p - buf));
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}
void udp_socket::close()
{
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asio::error_code ec;
m_ipv4_sock.close(ec);
m_ipv6_sock.close(ec);
m_socks5_sock.close(ec);
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m_callback.clear();
if (m_connection_ticket >= 0)
{
m_cc.done(m_connection_ticket);
m_connection_ticket = -1;
}
}
void udp_socket::bind(udp::endpoint const& ep, asio::error_code& ec)
{
if (m_ipv4_sock.is_open()) m_ipv4_sock.close(ec);
if (m_ipv6_sock.is_open()) m_ipv6_sock.close(ec);
if (ep.address().is_v4())
{
m_ipv4_sock.open(udp::v4(), ec);
if (ec) return;
m_ipv4_sock.bind(ep, ec);
if (ec) return;
m_ipv4_sock.async_receive_from(asio::buffer(m_v4_buf, sizeof(m_v4_buf))
, m_v4_ep, boost::bind(&udp_socket::on_read, this, &m_ipv4_sock, _1, _2));
}
else
{
m_ipv6_sock.set_option(v6only(true), ec);
if (ec) return;
m_ipv6_sock.bind(ep, ec);
if (ec) return;
m_ipv6_sock.async_receive_from(asio::buffer(m_v6_buf, sizeof(m_v6_buf))
, m_v6_ep, boost::bind(&udp_socket::on_read, this, &m_ipv6_sock, _1, _2));
}
m_bind_port = ep.port();
}
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void udp_socket::bind(int port)
{
asio::error_code ec;
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if (m_ipv4_sock.is_open()) m_ipv4_sock.close(ec);
if (m_ipv6_sock.is_open()) m_ipv6_sock.close(ec);
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m_ipv4_sock.open(udp::v4(), ec);
if (!ec)
{
m_ipv4_sock.bind(udp::endpoint(address_v4::any(), port), ec);
m_ipv4_sock.async_receive_from(asio::buffer(m_v4_buf, sizeof(m_v4_buf))
, m_v4_ep, boost::bind(&udp_socket::on_read, this, &m_ipv4_sock, _1, _2));
}
m_ipv6_sock.open(udp::v6(), ec);
if (!ec)
{
m_ipv6_sock.set_option(v6only(true), ec);
m_ipv6_sock.bind(udp::endpoint(address_v6::any(), port), ec);
m_ipv6_sock.async_receive_from(asio::buffer(m_v6_buf, sizeof(m_v6_buf))
, m_v6_ep, boost::bind(&udp_socket::on_read, this, &m_ipv6_sock, _1, _2));
}
m_bind_port = port;
}
void udp_socket::set_proxy_settings(proxy_settings const& ps)
{
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asio::error_code ec;
m_socks5_sock.close(ec);
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m_tunnel_packets = false;
m_proxy_settings = ps;
if (ps.type == proxy_settings::socks5
|| ps.type == proxy_settings::socks5_pw)
{
// connect to socks5 server and open up the UDP tunnel
tcp::resolver::query q(ps.hostname
, boost::lexical_cast<std::string>(ps.port));
m_resolver.async_resolve(q, boost::bind(
&udp_socket::on_name_lookup, this, _1, _2));
}
}
void udp_socket::on_name_lookup(asio::error_code const& e, tcp::resolver::iterator i)
{
if (e) return;
m_proxy_addr.address(i->endpoint().address());
m_proxy_addr.port(i->endpoint().port());
m_cc.enqueue(boost::bind(&udp_socket::on_connect, this, _1)
, boost::bind(&udp_socket::on_timeout, this), seconds(10));
}
void udp_socket::on_timeout()
{
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asio::error_code ec;
m_socks5_sock.close(ec);
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m_connection_ticket = -1;
}
void udp_socket::on_connect(int ticket)
{
m_connection_ticket = ticket;
asio::error_code ec;
m_socks5_sock.open(m_proxy_addr.address().is_v4()?tcp::v4():tcp::v6(), ec);
m_socks5_sock.async_connect(tcp::endpoint(m_proxy_addr.address(), m_proxy_addr.port())
, boost::bind(&udp_socket::on_connected, this, _1));
}
void udp_socket::on_connected(asio::error_code const& e)
{
m_cc.done(m_connection_ticket);
m_connection_ticket = -1;
if (e) return;
using namespace libtorrent::detail;
// send SOCKS5 authentication methods
char* p = &m_tmp_buf[0];
write_uint8(5, p); // SOCKS VERSION 5
if (m_proxy_settings.username.empty()
|| m_proxy_settings.type == proxy_settings::socks5)
{
write_uint8(1, p); // 1 authentication method (no auth)
write_uint8(0, p); // no authentication
}
else
{
write_uint8(2, p); // 2 authentication methods
write_uint8(0, p); // no authentication
write_uint8(2, p); // username/password
}
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::handshake1, this, _1));
}
void udp_socket::handshake1(asio::error_code const& e)
{
if (e) return;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake2, this, _1));
}
void udp_socket::handshake2(asio::error_code const& e)
{
if (e) return;
using namespace libtorrent::detail;
char* p = &m_tmp_buf[0];
int version = read_uint8(p);
int method = read_uint8(p);
if (version < 5) return;
if (method == 0)
{
socks_forward_udp();
}
else if (method == 2)
{
if (m_proxy_settings.username.empty())
{
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asio::error_code ec;
m_socks5_sock.close(ec);
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return;
}
// start sub-negotiation
char* p = &m_tmp_buf[0];
write_uint8(1, p);
write_uint8(m_proxy_settings.username.size(), p);
write_string(m_proxy_settings.username, p);
write_uint8(m_proxy_settings.password.size(), p);
write_string(m_proxy_settings.password, p);
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::handshake3, this, _1));
}
else
{
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asio::error_code ec;
m_socks5_sock.close(ec);
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return;
}
}
void udp_socket::handshake3(asio::error_code const& e)
{
if (e) return;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake4, this, _1));
}
void udp_socket::handshake4(asio::error_code const& e)
{
if (e) return;
using namespace libtorrent::detail;
char* p = &m_tmp_buf[0];
int version = read_uint8(p);
int status = read_uint8(p);
if (version != 1) return;
if (status != 0) return;
socks_forward_udp();
}
void udp_socket::socks_forward_udp()
{
using namespace libtorrent::detail;
// send SOCKS5 UDP command
char* p = &m_tmp_buf[0];
write_uint8(5, p); // SOCKS VERSION 5
write_uint8(3, p); // UDP ASSOCIATE command
write_uint8(0, p); // reserved
write_uint8(0, p); // ATYP IPv4
write_uint32(0, p); // IP any
write_uint16(m_bind_port, p);
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::connect1, this, _1));
}
void udp_socket::connect1(asio::error_code const& e)
{
if (e) return;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 10)
, boost::bind(&udp_socket::connect2, this, _1));
}
void udp_socket::connect2(asio::error_code const& e)
{
if (e) return;
using namespace libtorrent::detail;
char* p = &m_tmp_buf[0];
int version = read_uint8(p); // VERSION
int status = read_uint8(p); // STATUS
read_uint8(p); // RESERVED
int atyp = read_uint8(p); // address type
if (version != 5) return;
if (status != 0) return;
if (atyp == 1)
{
m_proxy_addr.address(address_v4(read_uint32(p)));
m_proxy_addr.port(read_uint16(p));
}
else
{
// in this case we need to read more data from the socket
TORRENT_ASSERT(false && "not implemented yet!");
}
m_tunnel_packets = true;
}