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premiere-libtorrent/src/udp_socket.cpp

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/*
Copyright (c) 2007, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "libtorrent/config.hpp"
#include "libtorrent/socket.hpp"
#include "libtorrent/udp_socket.hpp"
#include "libtorrent/connection_queue.hpp"
#include "libtorrent/escape_string.hpp"
#include "libtorrent/socket_io.hpp"
#include "libtorrent/error.hpp"
#include <stdlib.h>
#include <boost/bind.hpp>
#include <boost/array.hpp>
#if BOOST_VERSION < 103500
#include <asio/read.hpp>
#else
#include <boost/asio/read.hpp>
#endif
#if defined TORRENT_ASIO_DEBUGGING
#include "libtorrent/debug.hpp"
#endif
using namespace libtorrent;
udp_socket::udp_socket(asio::io_service& ios
, udp_socket::callback_t const& c
, udp_socket::callback2_t const& c2
, connection_queue& cc)
: m_callback(c)
, m_callback2(c2)
, m_ipv4_sock(ios)
, m_v4_buf_size(0)
, m_v4_buf(0)
, m_reallocate_buffer4(false)
#if TORRENT_USE_IPV6
, m_ipv6_sock(ios)
, m_v6_buf_size(0)
, m_v6_buf(0)
, m_reallocate_buffer6(false)
#endif
, m_bind_port(0)
, m_v4_outstanding(0)
#if TORRENT_USE_IPV6
, m_v6_outstanding(0)
#endif
, m_socks5_sock(ios)
, m_connection_ticket(-1)
, m_cc(cc)
, m_resolver(ios)
, m_queue_packets(false)
, m_tunnel_packets(false)
, m_abort(false)
, m_outstanding_ops(0)
{
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
m_magic = 0x1337;
m_started = false;
m_outstanding_when_aborted = -1;
#if defined BOOST_HAS_PTHREADS
m_thread = 0;
#endif
#endif
m_v4_buf_size = 1600;
m_v4_buf = (char*)malloc(m_v4_buf_size);
#if TORRENT_USE_IPV6
m_v6_buf_size = 1600;
m_v6_buf = (char*)malloc(m_v6_buf_size);
#endif
}
udp_socket::~udp_socket()
{
free(m_v4_buf);
#if TORRENT_USE_IPV6
free(m_v6_buf);
TORRENT_ASSERT_VAL(m_v6_outstanding == 0, m_v6_outstanding);
#endif
TORRENT_ASSERT_VAL(m_v4_outstanding == 0, m_v4_outstanding);
TORRENT_ASSERT(m_magic == 0x1337);
TORRENT_ASSERT(!m_callback || !m_started);
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
m_magic = 0;
#endif
TORRENT_ASSERT(m_outstanding_ops == 0);
}
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
#define CHECK_MAGIC check_magic_ cm_(m_magic)
struct check_magic_
{
check_magic_(int& m_): m(m_) { TORRENT_ASSERT(m == 0x1337); }
~check_magic_() { TORRENT_ASSERT(m == 0x1337); }
int& m;
};
#else
#define CHECK_MAGIC do {} while (false)
#endif
void udp_socket::send_hostname(char const* hostname, int port
, char const* p, int len, error_code& ec)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_open());
TORRENT_ASSERT(is_single_thread());
// if the sockets are closed, the udp_socket is closing too
if (!is_open()) return;
if (m_tunnel_packets)
{
// send udp packets through SOCKS5 server
wrap(hostname, port, p, len, ec);
return;
}
// this function is only supported when we're using a proxy
TORRENT_ASSERT(m_queue_packets);
if (!m_queue_packets) return;
m_queue.push_back(queued_packet());
queued_packet& qp = m_queue.back();
qp.ep.port(port);
qp.hostname = strdup(hostname);
qp.buf.insert(qp.buf.begin(), p, p + len);
qp.flags = 0;
}
bool udp_socket::maybe_clear_callback()
{
if (m_outstanding_ops + m_v4_outstanding
#if TORRENT_USE_IPV6
+ m_v6_outstanding
#endif
== 0)
{
// "this" may be destructed in the callback
m_callback.clear();
return true;
}
return false;
}
void udp_socket::send(udp::endpoint const& ep, char const* p, int len
, error_code& ec, int flags)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_open());
TORRENT_ASSERT(is_single_thread());
// if the sockets are closed, the udp_socket is closing too
if (!is_open()) return;
if (!(flags & peer_connection) || m_proxy_settings.proxy_peer_connections)
{
if (m_tunnel_packets)
{
// send udp packets through SOCKS5 server
wrap(ep, p, len, ec);
return;
}
if (m_queue_packets)
{
m_queue.push_back(queued_packet());
queued_packet& qp = m_queue.back();
qp.ep = ep;
qp.hostname = 0;
qp.flags = flags;
qp.buf.insert(qp.buf.begin(), p, p + len);
return;
}
}
#if TORRENT_USE_IPV6
if (ep.address().is_v4() && m_ipv4_sock.is_open())
#endif
m_ipv4_sock.send_to(asio::buffer(p, len), ep, 0, ec);
#if TORRENT_USE_IPV6
else
m_ipv6_sock.send_to(asio::buffer(p, len), ep, 0, ec);
#endif
}
void udp_socket::maybe_realloc_buffers(int which)
{
TORRENT_ASSERT(is_single_thread());
bool no_mem = false;
if (m_reallocate_buffer4 && (which & 1) && m_v4_outstanding == 0)
{
TORRENT_ASSERT(m_v4_outstanding == 0);
void* tmp = realloc(m_v4_buf, m_v4_buf_size);
if (tmp != 0) m_v4_buf = (char*)tmp;
else no_mem = true;
m_reallocate_buffer4 = false;
}
#if TORRENT_USE_IPV6
if (m_reallocate_buffer6 && (which & 2) && m_v6_outstanding == 0)
{
TORRENT_ASSERT(m_v6_outstanding == 0);
void* tmp = realloc(m_v6_buf, m_v6_buf_size);
if (tmp != 0) m_v6_buf = (char*)tmp;
else no_mem = true;
m_reallocate_buffer6 = false;
}
#endif
if (no_mem)
{
free(m_v4_buf);
m_v4_buf = 0;
m_v4_buf_size = 0;
#if TORRENT_USE_IPV6
free(m_v6_buf);
m_v6_buf = 0;
m_v6_buf_size = 0;
#endif
if (m_callback) m_callback(error::no_memory, m_v4_ep, 0, 0);
close();
}
}
void udp_socket::on_read(udp::socket* s, error_code const& e, std::size_t bytes_transferred)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_read");
#endif
TORRENT_ASSERT(m_magic == 0x1337);
TORRENT_ASSERT(is_single_thread());
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock)
{
TORRENT_ASSERT(m_v6_outstanding > 0);
--m_v6_outstanding;
}
else
#endif
{
TORRENT_ASSERT(m_v4_outstanding > 0);
--m_v4_outstanding;
}
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (!m_callback) return;
if (e)
{
TORRENT_TRY {
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock)
m_callback(e, m_v6_ep, 0, 0);
else
#endif
m_callback(e, m_v4_ep, 0, 0);
} TORRENT_CATCH (std::exception&) {}
// don't stop listening on recoverable errors
if (e != asio::error::host_unreachable
&& e != asio::error::fault
&& e != asio::error::connection_reset
&& e != asio::error::connection_refused
&& e != asio::error::connection_aborted
&& e != asio::error::operation_aborted
&& e != asio::error::message_size)
{
maybe_clear_callback();
return;
}
if (m_abort) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock && num_outstanding() == 0)
{
maybe_realloc_buffers(2);
if (m_abort) return;
++m_v6_outstanding;
s->async_receive_from(asio::buffer(m_v6_buf, m_v6_buf_size)
, m_v6_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
else
#endif
if (m_v4_outstanding == 0)
{
maybe_realloc_buffers(1);
if (m_abort) return;
++m_v4_outstanding;
s->async_receive_from(asio::buffer(m_v4_buf, m_v4_buf_size)
, m_v4_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
#ifdef TORRENT_DEBUG
m_started = true;
#endif
return;
}
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock)
{
TORRENT_TRY {
if (m_tunnel_packets)
{
// if the source IP doesn't match the proxy's, ignore the packet
if (m_v6_ep == m_proxy_addr)
unwrap(e, m_v6_buf, bytes_transferred);
}
else
{
m_callback(e, m_v6_ep, m_v6_buf, bytes_transferred);
}
} TORRENT_CATCH (std::exception&) {}
if (m_abort) return;
if (num_outstanding() == 0)
{
maybe_realloc_buffers(2);
if (m_abort) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
++m_v6_outstanding;
s->async_receive_from(asio::buffer(m_v6_buf, m_v6_buf_size)
, m_v6_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
}
else
#endif // TORRENT_USE_IPV6
{
TORRENT_TRY {
if (m_tunnel_packets)
{
// if the source IP doesn't match the proxy's, ignore the packet
if (m_v4_ep == m_proxy_addr)
unwrap(e, m_v4_buf, bytes_transferred);
}
else
{
m_callback(e, m_v4_ep, m_v4_buf, bytes_transferred);
}
} TORRENT_CATCH (std::exception&) {}
if (m_abort) return;
if (m_v4_outstanding == 0)
{
maybe_realloc_buffers(1);
if (m_abort) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
++m_v4_outstanding;
s->async_receive_from(asio::buffer(m_v4_buf, m_v4_buf_size)
, m_v4_ep, boost::bind(&udp_socket::on_read, this, s, _1, _2));
}
}
#ifdef TORRENT_DEBUG
m_started = true;
#endif
}
void udp_socket::wrap(udp::endpoint const& ep, char const* p, int len, error_code& ec)
{
CHECK_MAGIC;
using namespace libtorrent::detail;
char header[25];
char* h = header;
write_uint16(0, h); // reserved
write_uint8(0, h); // fragment
write_uint8(ep.address().is_v4()?1:4, h); // atyp
write_endpoint(ep, h);
boost::array<asio::const_buffer, 2> iovec;
iovec[0] = asio::const_buffer(header, h - header);
iovec[1] = asio::const_buffer(p, len);
#if TORRENT_USE_IPV6
if (m_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
#endif
m_ipv4_sock.send_to(iovec, m_proxy_addr, 0, ec);
#if TORRENT_USE_IPV6
else
m_ipv6_sock.send_to(iovec, m_proxy_addr, 0, ec);
#endif
}
void udp_socket::wrap(char const* hostname, int port, char const* p, int len, error_code& ec)
{
CHECK_MAGIC;
using namespace libtorrent::detail;
char header[270];
char* h = header;
write_uint16(0, h); // reserved
write_uint8(0, h); // fragment
write_uint8(3, h); // atyp
int hostlen = (std::min)(strlen(hostname), size_t(255));
write_uint8(hostlen, h); // hostname len
memcpy(h, hostname, hostlen);
h += hostlen;
write_uint16(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 TORRENT_USE_IPV6
if (m_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
#endif
m_ipv4_sock.send_to(iovec, m_proxy_addr, 0, ec);
#if TORRENT_USE_IPV6
else
m_ipv6_sock.send_to(iovec, m_proxy_addr, 0, ec);
#endif
}
// unwrap the UDP packet from the SOCKS5 header
void udp_socket::unwrap(error_code const& e, char const* buf, int size)
{
CHECK_MAGIC;
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 = read_v4_endpoint<udp::endpoint>(p);
}
#if TORRENT_USE_IPV6
else if (atyp == 4)
{
// IPv6
sender = read_v6_endpoint<udp::endpoint>(p);
}
#endif
else
{
int len = read_uint8(p);
if (len > (buf + size) - p) return;
std::string hostname(p, p + len);
p += len;
m_callback2(e, hostname.c_str(), p, size - (p - buf));
return;
}
m_callback(e, sender, p, size - (p - buf));
}
#ifndef BOOST_ASIO_ENABLE_CANCELIO
#error BOOST_ASIO_ENABLE_CANCELIO needs to be defined when building libtorrent to enable cancel() in asio on windows
#endif
void udp_socket::close()
{
TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_magic == 0x1337);
error_code ec;
// if we close the socket here, we can't shut down
// utp connections or NAT-PMP. We need to cancel the
// outstanding operations
m_ipv4_sock.cancel(ec);
if (ec == error::operation_not_supported)
m_ipv4_sock.close(ec);
TORRENT_ASSERT_VAL(!ec || ec == error::bad_descriptor, ec);
#if TORRENT_USE_IPV6
m_ipv6_sock.cancel(ec);
if (ec == error::operation_not_supported)
m_ipv6_sock.close(ec);
TORRENT_ASSERT_VAL(!ec || ec == error::bad_descriptor, ec);
#endif
m_socks5_sock.cancel(ec);
if (ec == error::operation_not_supported)
m_socks5_sock.close(ec);
TORRENT_ASSERT_VAL(!ec || ec == error::bad_descriptor, ec);
m_resolver.cancel();
m_abort = true;
#ifdef TORRENT_DEBUG
m_outstanding_when_aborted = num_outstanding();
#endif
if (m_connection_ticket >= 0)
{
m_cc.done(m_connection_ticket);
m_connection_ticket = -1;
// we just called done, which means on_timeout
// won't be called. Decrement the outstanding
// ops counter for that
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
}
maybe_clear_callback();
}
void udp_socket::set_buf_size(int s)
{
TORRENT_ASSERT(is_single_thread());
if (s > m_v4_buf_size)
{
m_v4_buf_size = s;
m_reallocate_buffer4 = true;
#if TORRENT_USE_IPV6
m_v6_buf_size = s;
m_reallocate_buffer6 = true;
#endif
}
}
void udp_socket::bind(udp::endpoint const& ep, error_code& ec)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_abort == false);
if (m_abort) return;
if (m_ipv4_sock.is_open()) m_ipv4_sock.close(ec);
#if TORRENT_USE_IPV6
if (m_ipv6_sock.is_open()) m_ipv6_sock.close(ec);
#endif
if (ep.address().is_v4())
{
m_ipv4_sock.open(udp::v4(), ec);
if (ec) return;
m_ipv4_sock.bind(ep, ec);
if (ec) return;
if (m_v4_outstanding == 0)
{
maybe_realloc_buffers(1);
if (m_abort) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
++m_v4_outstanding;
m_ipv4_sock.async_receive_from(asio::buffer(m_v4_buf, m_v4_buf_size)
, m_v4_ep, boost::bind(&udp_socket::on_read, this, &m_ipv4_sock
, _1, _2));
}
}
#if TORRENT_USE_IPV6
else
{
m_ipv6_sock.set_option(v6only(true), ec);
if (ec) return;
m_ipv6_sock.bind(ep, ec);
if (ec) return;
if (m_v6_outstanding == 0)
{
maybe_realloc_buffers(2);
if (m_abort) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
++m_v6_outstanding;
m_ipv6_sock.async_receive_from(asio::buffer(m_v6_buf, m_v6_buf_size)
, m_v6_ep, boost::bind(&udp_socket::on_read, this, &m_ipv6_sock
, _1, _2));
}
}
#endif
#ifdef TORRENT_DEBUG
m_started = true;
#endif
m_bind_port = ep.port();
}
void udp_socket::bind(int port)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_abort == false);
if (m_abort) return;
error_code ec;
if (m_ipv4_sock.is_open()) m_ipv4_sock.close(ec);
#if TORRENT_USE_IPV6
if (m_ipv6_sock.is_open()) m_ipv6_sock.close(ec);
#endif
maybe_realloc_buffers();
if (m_abort) return;
m_ipv4_sock.open(udp::v4(), ec);
if (!ec)
{
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
m_ipv4_sock.bind(udp::endpoint(address_v4::any(), port), ec);
if (m_v4_outstanding == 0)
{
++m_v4_outstanding;
m_ipv4_sock.async_receive_from(asio::buffer(m_v4_buf, m_v4_buf_size)
, m_v4_ep, boost::bind(&udp_socket::on_read, this, &m_ipv4_sock
, _1, _2));
}
}
#if TORRENT_USE_IPV6
m_ipv6_sock.open(udp::v6(), ec);
if (!ec)
{
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
m_ipv6_sock.set_option(v6only(true), ec);
m_ipv6_sock.bind(udp::endpoint(address_v6::any(), port), ec);
if (m_v6_outstanding == 0)
{
++m_v6_outstanding;
m_ipv6_sock.async_receive_from(asio::buffer(m_v6_buf, m_v6_buf_size)
, m_v6_ep, boost::bind(&udp_socket::on_read, this, &m_ipv6_sock
, _1, _2));
}
}
#endif // TORRENT_USE_IPV6
#ifdef TORRENT_DEBUG
m_started = true;
#endif
m_bind_port = port;
}
void udp_socket::set_proxy_settings(proxy_settings const& ps)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
error_code ec;
m_socks5_sock.close(ec);
m_tunnel_packets = false;
m_proxy_settings = ps;
if (m_abort) return;
if (ps.type == proxy_settings::socks5
|| ps.type == proxy_settings::socks5_pw)
{
m_queue_packets = true;
// connect to socks5 server and open up the UDP tunnel
tcp::resolver::query q(ps.hostname, to_string(ps.port).elems);
++m_outstanding_ops;
m_resolver.async_resolve(q, boost::bind(
&udp_socket::on_name_lookup, this, _1, _2));
}
}
void udp_socket::on_name_lookup(error_code const& e, tcp::resolver::iterator i)
{
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e == asio::error::operation_aborted) return;
TORRENT_ASSERT(is_single_thread());
if (e)
{
TORRENT_TRY {
if (m_callback) m_callback(e, udp::endpoint(), 0, 0);
} TORRENT_CATCH (std::exception&) {}
return;
}
m_proxy_addr.address(i->endpoint().address());
m_proxy_addr.port(i->endpoint().port());
// on_connect may be called from within this thread
// the semantics for on_connect and on_timeout is
// a bit complicated. See comments in connection_queue.hpp
// for more details. This semantic determines how and
// when m_outstanding_ops may be decremented
// To simplyfy this, it's probably a good idea to
// merge on_connect and on_timeout to a single function
++m_outstanding_ops;
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()
{
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
error_code ec;
m_socks5_sock.close(ec);
m_connection_ticket = -1;
}
void udp_socket::on_connect(int ticket)
{
TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (m_abort) return;
if (is_closed()) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_connected");
#endif
m_connection_ticket = ticket;
// at this point on_timeout may be called before on_connected
// so increment the outstanding ops
// it may also not be called in case we call
// connection_queue::done first, so be sure to
// decrement if that happens
++m_outstanding_ops;
error_code ec;
m_socks5_sock.open(m_proxy_addr.address().is_v4()?tcp::v4():tcp::v6(), ec);
++m_outstanding_ops;
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(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_connected");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e == asio::error::operation_aborted) return;
TORRENT_ASSERT(is_single_thread());
m_cc.done(m_connection_ticket);
m_connection_ticket = -1;
// we just called done, which means on_timeout
// won't be called. Decrement the outstanding
// ops counter for that
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
if (e)
{
TORRENT_TRY {
if (m_callback) m_callback(e, udp::endpoint(), 0, 0);
} TORRENT_CATCH (std::exception&) {}
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
}
TORRENT_ASSERT_VAL(p - m_tmp_buf < int(sizeof(m_tmp_buf)), (p - m_tmp_buf));
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake1");
#endif
++m_outstanding_ops;
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(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake1");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e) return;
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake2");
#endif
++m_outstanding_ops;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake2, this, _1));
}
void udp_socket::handshake2(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake2");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e) return;
using namespace libtorrent::detail;
TORRENT_ASSERT(is_single_thread());
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(/*l*/);
}
else if (method == 2)
{
if (m_proxy_settings.username.empty())
{
error_code ec;
m_socks5_sock.close(ec);
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);
TORRENT_ASSERT_VAL(p - m_tmp_buf < int(sizeof(m_tmp_buf)), (p - m_tmp_buf));
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake3");
#endif
++m_outstanding_ops;
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::handshake3, this, _1));
}
else
{
error_code ec;
m_socks5_sock.close(ec);
return;
}
}
void udp_socket::handshake3(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake3");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e) return;
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake4");
#endif
++m_outstanding_ops;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake4, this, _1));
}
void udp_socket::handshake4(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake4");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e) return;
TORRENT_ASSERT(is_single_thread());
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(/*l*/);
}
void udp_socket::socks_forward_udp()
{
CHECK_MAGIC;
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
error_code ec;
tcp::endpoint local = m_socks5_sock.local_endpoint(ec);
write_uint8(local.address().is_v4() ? 1 : 4, p); // ATYP IPv4
detail::write_address(local.address(), p);
int port = 0;
#if TORRENT_USE_IPV6
if (local.address().is_v4())
#endif
port = m_ipv4_sock.local_endpoint(ec).port();
#if TORRENT_USE_IPV6
else
port = m_ipv6_sock.local_endpoint(ec).port();
#endif
detail::write_uint16(port , p);
TORRENT_ASSERT_VAL(p - m_tmp_buf < int(sizeof(m_tmp_buf)), (p - m_tmp_buf));
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::connect1");
#endif
++m_outstanding_ops;
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(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::connect1");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e) return;
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::connect2");
#endif
++m_outstanding_ops;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 10)
, boost::bind(&udp_socket::connect2, this, _1));
}
void udp_socket::connect2(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::connect2");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
m_queue.clear();
maybe_clear_callback();
return;
}
CHECK_MAGIC;
if (e)
{
m_queue.clear();
return;
}
TORRENT_ASSERT(is_single_thread());
using namespace libtorrent::detail;
char* p = &m_tmp_buf[0];
int version = read_uint8(p); // VERSION
int status = read_uint8(p); // STATUS
++p; // RESERVED
int atyp = read_uint8(p); // address type
if (version != 5 || status != 0)
{
m_queue.clear();
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_queue.clear();
return;
}
m_tunnel_packets = true;
m_queue_packets = false;
// forward all packets that were put in the queue
while (!m_queue.empty())
{
queued_packet const& p = m_queue.front();
error_code ec;
if (p.hostname)
{
udp_socket::send_hostname(p.hostname, p.ep.port(), &p.buf[0], p.buf.size(), ec);
free(p.hostname);
}
else
{
udp_socket::send(p.ep, &p.buf[0], p.buf.size(), ec, p.flags);
}
m_queue.pop_front();
}
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::hung_up");
#endif
++m_outstanding_ops;
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 10)
, boost::bind(&udp_socket::hung_up, this, _1));
}
void udp_socket::hung_up(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::hung_up");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort)
{
maybe_clear_callback();
return;
}
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
if (e == asio::error::operation_aborted || m_abort) return;
// the socks connection was closed, re-open it
set_proxy_settings(m_proxy_settings);
}
rate_limited_udp_socket::rate_limited_udp_socket(io_service& ios
, callback_t const& c
, callback2_t const& c2
, connection_queue& cc)
: udp_socket(ios, c, c2, cc)
, m_timer(ios)
, m_queue_size_limit(200)
, m_rate_limit(4000)
, m_quota(4000)
, m_last_tick(time_now())
{
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("rate_limited_udp_socket::on_tick");
#endif
error_code ec;
m_timer.expires_from_now(seconds(1), ec);
m_timer.async_wait(boost::bind(&rate_limited_udp_socket::on_tick, this, _1));
TORRENT_ASSERT_VAL(!ec, ec);
}
bool rate_limited_udp_socket::send(udp::endpoint const& ep, char const* p
, int len, error_code& ec, int flags)
{
if (m_quota < len)
{
if (int(m_queue.size()) >= m_queue_size_limit && (flags & dont_drop) == 0)
return false;
m_queue.push_back(queued_packet());
queued_packet& qp = m_queue.back();
qp.ep = ep;
qp.flags = flags;
qp.buf.insert(qp.buf.begin(), p, p + len);
return true;
}
m_quota -= len;
udp_socket::send(ep, p, len, ec, flags);
return true;
}
void rate_limited_udp_socket::on_tick(error_code const& e)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("rate_limited_udp_socket::on_tick");
#endif
if (e) return;
if (is_closed()) return;
error_code ec;
ptime now = time_now_hires();
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("rate_limited_udp_socket::on_tick");
#endif
m_timer.expires_at(now + seconds(1), ec);
m_timer.async_wait(boost::bind(&rate_limited_udp_socket::on_tick, this, _1));
time_duration delta = now - m_last_tick;
m_last_tick = now;
if (m_quota < m_rate_limit) m_quota += m_rate_limit * total_milliseconds(delta) / 1000;
if (m_queue.empty()) return;
while (!m_queue.empty() && int(m_queue.front().buf.size()) <= m_quota)
{
queued_packet const& p = m_queue.front();
TORRENT_ASSERT(m_quota >= int(p.buf.size()));
m_quota -= p.buf.size();
error_code ec;
udp_socket::send(p.ep, &p.buf[0], p.buf.size(), ec, p.flags);
m_queue.pop_front();
}
}
void rate_limited_udp_socket::close()
{
error_code ec;
m_timer.cancel(ec);
udp_socket::close();
}
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