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twister-core/libtorrent/src/udp_socket.cpp

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/*
Copyright (c) 2007-2012, 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/socket_io.hpp"
#include "libtorrent/error.hpp"
#include "libtorrent/string_util.hpp" // for allocate_string_copy
#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
, connection_queue& cc)
: m_observers_locked(false)
, m_ipv4_sock(ios)
, m_buf_size(0)
, m_new_buf_size(0)
, m_buf(0)
#if TORRENT_USE_IPV6
, m_ipv6_sock(ios)
#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_force_proxy(false)
, m_abort(false)
, m_outstanding_ops(0)
#if TORRENT_USE_IPV6
, m_v6_write_subscribed(false)
#endif
, m_v4_write_subscribed(false)
{
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
m_magic = 0x1337;
m_started = false;
m_outstanding_when_aborted = -1;
m_outstanding_connect_queue = 0;
m_outstanding_connect = 0;
m_outstanding_timeout = 0;
m_outstanding_resolve = 0;
m_outstanding_socks = 0;
#if defined BOOST_HAS_PTHREADS
m_thread = 0;
#endif
#endif
m_buf_size = 10000;
m_new_buf_size = m_buf_size;
m_buf = (char*)malloc(m_buf_size);
}
udp_socket::~udp_socket()
{
free(m_buf);
#if TORRENT_USE_IPV6
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_observers_locked == false);
#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_single_thread());
// if the sockets are closed, the udp_socket is closing too
if (!is_open())
{
ec = error_code(boost::system::errc::bad_file_descriptor, boost::system::generic_category());
return;
}
if (m_tunnel_packets)
{
// send udp packets through SOCKS5 server
wrap(hostname, port, p, len, ec);
return;
}
else if (m_force_proxy)
{
return;
}
// this function is only supported when we're using a proxy
if (!m_queue_packets)
{
address target = address::from_string(hostname, ec);
if (!ec) send(udp::endpoint(target, port), p, len, ec, 0);
return;
}
if (m_queue.size() > 1000) return;
m_queue.push_back(queued_packet());
queued_packet& qp = m_queue.back();
qp.ep.port(port);
qp.hostname = allocate_string_copy(hostname);
qp.buf.insert(qp.buf.begin(), p, p + len);
qp.flags = 0;
}
void udp_socket::send(udp::endpoint const& ep, char const* p, int len
, error_code& ec, int flags)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
// if the sockets are closed, the udp_socket is closing too
if (!is_open())
{
ec = error_code(boost::system::errc::bad_file_descriptor, boost::system::generic_category());
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)
{
if (m_queue.size() > 1000) return;
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 (m_force_proxy) return;
#if TORRENT_USE_IPV6
if (ep.address().is_v6() && m_ipv6_sock.is_open())
m_ipv6_sock.send_to(asio::buffer(p, len), ep, 0, ec);
else
#endif
m_ipv4_sock.send_to(asio::buffer(p, len), ep, 0, ec);
if (ec == error::would_block || ec == error::try_again)
{
#if TORRENT_USE_IPV6
if (ep.address().is_v6() && m_ipv6_sock.is_open())
{
if (!m_v6_write_subscribed)
{
m_ipv6_sock.async_send(asio::null_buffers()
, boost::bind(&udp_socket::on_writable, this, _1, &m_ipv6_sock));
m_v6_write_subscribed = true;
}
}
else
#endif
{
if (!m_v4_write_subscribed)
{
m_ipv4_sock.async_send(asio::null_buffers()
, boost::bind(&udp_socket::on_writable, this, _1, &m_ipv4_sock));
m_v4_write_subscribed = true;
}
}
}
}
void udp_socket::on_writable(error_code const& ec, udp::socket* s)
{
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock)
m_v6_write_subscribed = false;
else
#endif
m_v4_write_subscribed = false;
call_writable_handler();
}
// called whenever the socket is readable
void udp_socket::on_read(error_code const& ec, udp::socket* s)
{
#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 (ec == asio::error::operation_aborted) return;
if (m_abort) return;
CHECK_MAGIC;
for (;;)
{
error_code ec;
udp::endpoint ep;
size_t bytes_transferred = s->receive_from(asio::buffer(m_buf, m_buf_size), ep, 0, ec);
if (ec == asio::error::would_block || ec == asio::error::try_again) break;
on_read_impl(s, ep, ec, bytes_transferred);
}
call_drained_handler();
setup_read(s);
}
void udp_socket::call_handler(error_code const& ec, udp::endpoint const& ep, char const* buf, int size)
{
m_observers_locked = true;
for (std::vector<udp_socket_observer*>::iterator i = m_observers.begin();
i != m_observers.end();)
{
bool ret = false;
TORRENT_TRY {
ret = (*i)->incoming_packet(ec, ep, buf, size);
} TORRENT_CATCH (std::exception&) {}
if (*i == NULL) i = m_observers.erase(i);
else ++i;
if (ret) break;
}
if (!m_added_observers.empty())
{
m_observers.insert(m_observers.end(), m_added_observers.begin(), m_added_observers.end());
m_added_observers.clear();
}
m_observers_locked = false;
if (m_new_buf_size != m_buf_size)
set_buf_size(m_new_buf_size);
}
void udp_socket::call_handler(error_code const& ec, const char* host, char const* buf, int size)
{
m_observers_locked = true;
for (std::vector<udp_socket_observer*>::iterator i = m_observers.begin();
i != m_observers.end();)
{
bool ret = false;
TORRENT_TRY {
ret = (*i)->incoming_packet(ec, host, buf, size);
} TORRENT_CATCH (std::exception&) {}
if (*i == NULL) i = m_observers.erase(i);
else ++i;
if (ret) break;
}
if (!m_added_observers.empty())
{
m_observers.insert(m_observers.end(), m_added_observers.begin(), m_added_observers.end());
m_added_observers.clear();
}
m_observers_locked = false;
if (m_new_buf_size != m_buf_size)
set_buf_size(m_new_buf_size);
}
void udp_socket::call_drained_handler()
{
m_observers_locked = true;
for (std::vector<udp_socket_observer*>::iterator i = m_observers.begin();
i != m_observers.end();)
{
TORRENT_TRY {
(*i)->socket_drained();
} TORRENT_CATCH (std::exception&) {}
if (*i == NULL) i = m_observers.erase(i);
else ++i;
}
if (!m_added_observers.empty())
{
m_observers.insert(m_observers.end(), m_added_observers.begin(), m_added_observers.end());
m_added_observers.clear();
}
m_observers_locked = false;
if (m_new_buf_size != m_buf_size)
set_buf_size(m_new_buf_size);
}
void udp_socket::call_writable_handler()
{
m_observers_locked = true;
for (std::vector<udp_socket_observer*>::iterator i = m_observers.begin();
i != m_observers.end();)
{
TORRENT_TRY {
(*i)->writable();
} TORRENT_CATCH (std::exception&) {}
if (*i == NULL) i = m_observers.erase(i);
else ++i;
}
if (!m_added_observers.empty())
{
m_observers.insert(m_observers.end(), m_added_observers.begin(), m_added_observers.end());
m_added_observers.clear();
}
m_observers_locked = false;
if (m_new_buf_size != m_buf_size)
set_buf_size(m_new_buf_size);
}
void udp_socket::subscribe(udp_socket_observer* o)
{
TORRENT_ASSERT(std::find(m_observers.begin(), m_observers.end(), o) == m_observers.end());
if (m_observers_locked)
m_added_observers.push_back(o);
else
m_observers.push_back(o);
}
void udp_socket::unsubscribe(udp_socket_observer* o)
{
std::vector<udp_socket_observer*>::iterator i = std::find(m_observers.begin(), m_observers.end(), o);
if (i == m_observers.end()) return;
if (m_observers_locked)
*i = NULL;
else
m_observers.erase(i);
}
void udp_socket::on_read_impl(udp::socket* s, udp::endpoint const& ep
, error_code const& e, std::size_t bytes_transferred)
{
TORRENT_ASSERT(m_magic == 0x1337);
TORRENT_ASSERT(is_single_thread());
if (e)
{
call_handler(e, ep, 0, 0);
// 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::network_reset
&& e != asio::error::network_unreachable
#ifdef WIN32
// ERROR_MORE_DATA means the same thing as EMSGSIZE
&& e != error_code(ERROR_MORE_DATA, get_system_category())
&& e != error_code(ERROR_HOST_UNREACHABLE, get_system_category())
&& e != error_code(ERROR_PORT_UNREACHABLE, get_system_category())
&& e != error_code(ERROR_RETRY, get_system_category())
&& e != error_code(ERROR_NETWORK_UNREACHABLE, get_system_category())
&& e != error_code(ERROR_CONNECTION_REFUSED, get_system_category())
&& e != error_code(ERROR_CONNECTION_ABORTED, get_system_category())
#endif
&& e != asio::error::message_size)
{
return;
}
if (m_abort) return;
return;
}
TORRENT_TRY {
if (m_tunnel_packets)
{
// if the source IP doesn't match the proxy's, ignore the packet
if (ep == m_udp_proxy_addr)
unwrap(e, m_buf, bytes_transferred);
}
else if (!m_force_proxy) // block incoming packets that aren't coming via the proxy
{
call_handler(e, ep, m_buf, bytes_transferred);
}
} TORRENT_CATCH (std::exception&) {}
}
void udp_socket::setup_read(udp::socket* s)
{
if (m_abort) return;
#if TORRENT_USE_IPV6
if (s == &m_ipv6_sock)
++m_v6_outstanding;
else
#endif
++m_v4_outstanding;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
#endif
udp::endpoint ep;
s->async_receive_from(asio::null_buffers()
, ep, boost::bind(&udp_socket::on_read, this, _1, s));
}
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_udp_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
#endif
m_ipv4_sock.send_to(iovec, m_udp_proxy_addr, 0, ec);
#if TORRENT_USE_IPV6
else
m_ipv6_sock.send_to(iovec, m_udp_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_udp_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
#endif
m_ipv4_sock.send_to(iovec, m_udp_proxy_addr, 0, ec);
#if TORRENT_USE_IPV6
else
m_ipv6_sock.send_to(iovec, m_udp_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;
call_handler(e, hostname.c_str(), p, size - (p - buf));
return;
}
call_handler(e, sender, p, size - (p - buf));
}
#if !defined BOOST_ASIO_ENABLE_CANCELIO && defined TORRENT_WINDOWS
#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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_timeout > 0);
--m_outstanding_timeout;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
}
}
void udp_socket::set_buf_size(int s)
{
TORRENT_ASSERT(is_single_thread());
if (m_observers_locked)
{
// we can't actually reallocate the buffer while
// it's being used by the observers, we have to
// do that once we're done iterating over them
m_new_buf_size = s;
return;
}
if (s == m_buf_size) return;
bool no_mem = false;
void* tmp = realloc(m_buf, s);
if (tmp != 0)
{
m_buf = (char*)tmp;
m_buf_size = s;
m_new_buf_size = s;
}
else
{
no_mem = true;
}
if (no_mem)
{
free(m_buf);
m_buf = 0;
m_buf_size = 0;
m_new_buf_size = 0;
udp::endpoint ep;
call_handler(error::no_memory, ep, 0, 0);
close();
}
}
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)
{
ec = boost::asio::error::operation_aborted;
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;
udp::socket::non_blocking_io ioc(true);
m_ipv4_sock.io_control(ioc, ec);
if (ec) return;
setup_read(&m_ipv4_sock);
}
#if TORRENT_USE_IPV6
else
{
#ifdef IPV6_V6ONLY
m_ipv6_sock.set_option(v6only(true), ec);
if (ec) return;
#endif
m_ipv6_sock.bind(ep, ec);
if (ec) return;
udp::socket::non_blocking_io ioc(true);
m_ipv6_sock.io_control(ioc, ec);
if (ec) return;
setup_read(&m_ipv6_sock);
}
#endif
#ifdef TORRENT_DEBUG
m_started = true;
#endif
m_bind_port = ep.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;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_resolve;
#endif
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)
{
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_resolve > 0);
--m_outstanding_resolve;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e == asio::error::operation_aborted) return;
TORRENT_ASSERT(is_single_thread());
if (e)
{
call_handler(e, udp::endpoint(), 0, 0);
drain_queue();
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
// 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 += 2;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_timeout;
++m_outstanding_connect_queue;
#endif
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()
{
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_timeout > 0);
--m_outstanding_timeout;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
m_queue_packets = false;
if (m_abort) 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());
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_connect_queue > 0);
--m_outstanding_connect_queue;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
CHECK_MAGIC;
if (ticket == -1)
{
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_timeout > 0);
--m_outstanding_timeout;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
close();
return;
}
if (m_abort) return;
if (is_closed()) return;
if (m_connection_ticket != -1)
{
// there's already an outstanding connect. Cancel it.
m_socks5_sock.close();
m_connection_ticket = -1;
}
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_connected");
#endif
m_connection_ticket = ticket;
error_code ec;
m_socks5_sock.open(m_proxy_addr.address().is_v4()?tcp::v4():tcp::v6(), ec);
++m_outstanding_ops;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_connect;
#endif
m_socks5_sock.async_connect(tcp::endpoint(m_proxy_addr.address(), m_proxy_addr.port())
, boost::bind(&udp_socket::on_connected, this, _1, ticket));
}
void udp_socket::on_connected(error_code const& e, int ticket)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_connected");
#endif
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_connect > 0);
--m_outstanding_connect;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
CHECK_MAGIC;
TORRENT_ASSERT(is_single_thread());
m_cc.done(ticket);
// if the tickets mismatch, another connection attempt
// was initiated while waiting for this one to complete.
if (ticket == 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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_timeout > 0);
--m_outstanding_timeout;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (e == asio::error::operation_aborted) return;
// if ticket != m_connection_ticket, it means m_connection_ticket
// will not have been reset, and it means we are still waiting
// for a connection attempt.
if (m_connection_ticket != -1) return;
if (m_abort) return;
if (e)
{
call_handler(e, udp::endpoint(), 0, 0);
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;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e)
{
drain_queue();
return;
}
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake2");
#endif
++m_outstanding_ops;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e)
{
drain_queue();
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)
{
error_code ec;
m_socks5_sock.close(ec);
drain_queue();
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);
drain_queue();
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;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::handshake3, this, _1));
}
else
{
drain_queue();
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e)
{
drain_queue();
return;
}
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake4");
#endif
++m_outstanding_ops;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e)
{
drain_queue();
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 || status != 0)
{
drain_queue();
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;
write_uint8(1, p); // ATYP = IPv4
write_uint32(0, p); // 0.0.0.0
write_uint16(0, p); // :0
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;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) return;
CHECK_MAGIC;
if (e)
{
drain_queue();
return;
}
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::connect2");
#endif
++m_outstanding_ops;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort)
{
m_queue.clear();
return;
}
CHECK_MAGIC;
if (e)
{
drain_queue();
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)
{
drain_queue();
return;
}
if (atyp == 1)
{
m_udp_proxy_addr.address(address_v4(read_uint32(p)));
m_udp_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!");
drain_queue();
return;
}
m_tunnel_packets = true;
drain_queue();
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::hung_up");
#endif
++m_outstanding_ops;
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
++m_outstanding_socks;
#endif
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
#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
TORRENT_ASSERT(m_outstanding_socks > 0);
--m_outstanding_socks;
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
TORRENT_ASSERT(m_outstanding_ops == m_outstanding_connect
+ m_outstanding_timeout
+ m_outstanding_resolve
+ m_outstanding_connect_queue
+ m_outstanding_socks);
if (m_abort) 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);
}
void udp_socket::drain_queue()
{
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 if (!m_force_proxy) // block incoming packets that aren't coming via the proxy
{
udp_socket::send(p.ep, &p.buf[0], p.buf.size(), ec, p.flags);
}
m_queue.pop_front();
}
}
rate_limited_udp_socket::rate_limited_udp_socket(io_service& ios
, connection_queue& cc)
: udp_socket(ios, cc)
, m_rate_limit(8000)
, m_quota(8000)
, m_last_tick(time_now())
{
}
bool rate_limited_udp_socket::send(udp::endpoint const& ep, char const* p
, int len, error_code& ec, int flags)
{
ptime now = time_now_hires();
time_duration delta = now - m_last_tick;
m_last_tick = now;
// add any new quota we've accrued since last time
m_quota += boost::uint64_t(m_rate_limit) * total_microseconds(delta) / 1000000;
// allow 3 seconds worth of burst
if (m_quota > 3 * m_rate_limit) m_quota = 3 * m_rate_limit;
// if there's no quota, and it's OK to drop, just
// drop the packet
if (m_quota < len && (flags & dont_drop) == 0) return false;
m_quota -= len;
if (m_quota < 0) m_quota = 0;
udp_socket::send(ep, p, len, ec, flags);
return true;
}