premiere-libtorrent/src/udp_socket.cpp

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2009-01-26 19:15:20 +01:00
/*
Copyright (c) 2007-2012, Arvid Norberg
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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"
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#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
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#include <stdlib.h>
#include <boost/bind.hpp>
#include <boost/array.hpp>
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#if BOOST_VERSION < 103500
#include <asio/read.hpp>
#else
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#include <boost/asio/read.hpp>
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#endif
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#if defined TORRENT_ASIO_DEBUGGING
#include "libtorrent/debug.hpp"
#endif
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using namespace libtorrent;
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udp_socket::udp_socket(asio::io_service& ios
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, connection_queue& cc)
: m_observers_locked(false)
, m_ipv4_sock(ios)
, m_buf_size(0)
, m_buf(0)
#if TORRENT_USE_IPV6
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, m_ipv6_sock(ios)
#endif
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, m_bind_port(0)
, m_v4_outstanding(0)
#if TORRENT_USE_IPV6
, m_v6_outstanding(0)
#endif
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, m_socks5_sock(ios)
, m_connection_ticket(-1)
, m_cc(cc)
, m_resolver(ios)
, m_queue_packets(false)
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, m_tunnel_packets(false)
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, m_abort(false)
, m_outstanding_ops(0)
#if TORRENT_USE_IPV6
, m_v6_write_subscribed(false)
#endif
, m_v4_write_subscribed(false)
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{
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
m_magic = 0x1337;
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m_started = false;
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m_outstanding_when_aborted = -1;
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#if defined BOOST_HAS_PTHREADS
m_thread = 0;
#endif
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#endif
m_buf_size = 2000;
m_buf = (char*)malloc(m_buf_size);
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}
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udp_socket::~udp_socket()
{
free(m_buf);
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#if TORRENT_USE_IPV6
TORRENT_ASSERT_VAL(m_v6_outstanding == 0, m_v6_outstanding);
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#endif
TORRENT_ASSERT_VAL(m_v4_outstanding == 0, m_v4_outstanding);
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TORRENT_ASSERT(m_magic == 0x1337);
TORRENT_ASSERT(m_observers_locked == false);
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#if defined TORRENT_DEBUG || TORRENT_RELEASE_ASSERTS
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m_magic = 0;
#endif
TORRENT_ASSERT(m_outstanding_ops == 0);
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}
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#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
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#define CHECK_MAGIC do {} while (false)
#endif
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void udp_socket::send_hostname(char const* hostname, int port
, char const* p, int len, error_code& ec)
{
CHECK_MAGIC;
TORRENT_ASSERT(is_open());
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TORRENT_ASSERT(is_single_thread());
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// 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
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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 = allocate_string_copy(hostname);
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qp.buf.insert(qp.buf.begin(), p, p + len);
qp.flags = 0;
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}
void udp_socket::send(udp::endpoint const& ep, char const* p, int len
, error_code& ec, int flags)
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{
CHECK_MAGIC;
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TORRENT_ASSERT(is_open());
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TORRENT_ASSERT(is_single_thread());
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// if the sockets are closed, the udp_socket is closing too
if (!is_open()) return;
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if (!(flags & peer_connection) || m_proxy_settings.proxy_peer_connections)
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{
if (m_tunnel_packets)
{
// send udp packets through SOCKS5 server
wrap(ep, p, len, ec);
return;
}
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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_v6() && m_ipv6_sock.is_open())
m_ipv6_sock.send_to(asio::buffer(p, len), ep, 0, ec);
else
#endif
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m_ipv4_sock.send_to(asio::buffer(p, len), ep, 0, ec);
if (ec == error::would_block)
{
#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;
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else
#endif
m_v4_write_subscribed = false;
call_writable_handler();
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}
// called whenever the socket is readable
void udp_socket::on_read(error_code const& ec, udp::socket* s)
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{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_read");
#endif
TORRENT_ASSERT(m_magic == 0x1337);
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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;
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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) 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;
}
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;
}
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;
}
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;
}
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());
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if (e)
{
call_handler(e, ep, 0, 0);
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// 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
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&& 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())
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&& 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
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&& e != asio::error::message_size)
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{
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return;
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}
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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_proxy_addr)
unwrap(e, m_buf, bytes_transferred);
}
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else
{
call_handler(e, ep, m_buf, bytes_transferred);
}
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} TORRENT_CATCH (std::exception&) {}
}
void udp_socket::setup_read(udp::socket* s)
{
if (m_abort) return;
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#if TORRENT_USE_IPV6
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if (s == &m_ipv6_sock)
++m_v6_outstanding;
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else
#endif
++m_v4_outstanding;
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#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_read");
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#endif
udp::endpoint ep;
s->async_receive_from(asio::null_buffers()
, ep, boost::bind(&udp_socket::on_read, this, _1, s));
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}
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void udp_socket::wrap(udp::endpoint const& ep, char const* p, int len, error_code& ec)
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{
CHECK_MAGIC;
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using namespace libtorrent::detail;
char header[25];
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char* h = header;
write_uint16(0, h); // reserved
write_uint8(0, h); // fragment
write_uint8(ep.address().is_v4()?1:4, h); // atyp
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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);
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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
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if (m_proxy_addr.address().is_v4() && m_ipv4_sock.is_open())
#endif
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m_ipv4_sock.send_to(iovec, m_proxy_addr, 0, ec);
#if TORRENT_USE_IPV6
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else
m_ipv6_sock.send_to(iovec, m_proxy_addr, 0, ec);
#endif
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}
// unwrap the UDP packet from the SOCKS5 header
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void udp_socket::unwrap(error_code const& e, char const* buf, int size)
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{
CHECK_MAGIC;
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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
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sender = read_v4_endpoint<udp::endpoint>(p);
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}
#if TORRENT_USE_IPV6
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else if (atyp == 4)
{
// IPv6
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sender = read_v6_endpoint<udp::endpoint>(p);
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}
#endif
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else
{
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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));
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return;
}
call_handler(e, sender, p, size - (p - buf));
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}
#if !defined BOOST_ASIO_ENABLE_CANCELIO && defined TORRENT_WINDOWS
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#error BOOST_ASIO_ENABLE_CANCELIO needs to be defined when building libtorrent to enable cancel() in asio on windows
#endif
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void udp_socket::close()
{
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TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_magic == 0x1337);
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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();
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m_abort = true;
#ifdef TORRENT_DEBUG
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m_outstanding_when_aborted = num_outstanding();
#endif
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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) return;
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}
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}
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void udp_socket::set_buf_size(int s)
{
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TORRENT_ASSERT(is_single_thread());
bool no_mem = false;
void* tmp = realloc(m_buf, s);
if (tmp != 0)
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{
m_buf = (char*)tmp;
m_buf_size = s;
}
else
{
no_mem = true;
}
if (no_mem)
{
free(m_buf);
m_buf = 0;
m_buf_size = 0;
udp::endpoint ep;
call_handler(error::no_memory, ep, 0, 0);
close();
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}
}
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void udp_socket::bind(udp::endpoint const& ep, error_code& ec)
{
CHECK_MAGIC;
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TORRENT_ASSERT(is_single_thread());
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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;
udp::socket::non_blocking_io ioc(true);
m_ipv4_sock.io_control(ioc, ec);
if (ec) return;
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setup_read(&m_ipv4_sock);
}
#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;
udp::socket::non_blocking_io ioc(true);
m_ipv6_sock.io_control(ioc, ec);
if (ec) return;
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setup_read(&m_ipv6_sock);
}
#endif
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#ifdef TORRENT_DEBUG
m_started = true;
#endif
m_bind_port = ep.port();
}
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void udp_socket::bind(int port)
{
CHECK_MAGIC;
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TORRENT_ASSERT(is_single_thread());
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TORRENT_ASSERT(m_abort == false);
if (m_abort) return;
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error_code ec;
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if (m_ipv4_sock.is_open()) m_ipv4_sock.close(ec);
#if TORRENT_USE_IPV6
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if (m_ipv6_sock.is_open()) m_ipv6_sock.close(ec);
#endif
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if (m_abort) return;
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2007-12-09 05:15:24 +01:00
m_ipv4_sock.open(udp::v4(), ec);
if (!ec)
{
m_ipv4_sock.bind(udp::endpoint(address_v4::any(), port), ec);
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setup_read(&m_ipv4_sock);
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}
#if TORRENT_USE_IPV6
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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);
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setup_read(&m_ipv6_sock);
}
#endif // TORRENT_USE_IPV6
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#ifdef TORRENT_DEBUG
m_started = true;
#endif
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m_bind_port = port;
}
void udp_socket::set_proxy_settings(proxy_settings const& ps)
{
CHECK_MAGIC;
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TORRENT_ASSERT(is_single_thread());
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error_code ec;
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m_socks5_sock.close(ec);
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m_tunnel_packets = false;
m_proxy_settings = ps;
if (m_abort) return;
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if (ps.type == proxy_settings::socks5
|| ps.type == proxy_settings::socks5_pw)
{
m_queue_packets = true;
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// connect to socks5 server and open up the UDP tunnel
tcp::resolver::query q(ps.hostname, to_string(ps.port).elems);
++m_outstanding_ops;
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m_resolver.async_resolve(q, boost::bind(
&udp_socket::on_name_lookup, this, _1, _2));
}
}
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void udp_socket::on_name_lookup(error_code const& e, tcp::resolver::iterator i)
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{
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
if (e == asio::error::operation_aborted) return;
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TORRENT_ASSERT(is_single_thread());
if (e)
{
call_handler(e, udp::endpoint(), 0, 0);
return;
}
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m_proxy_addr.address(i->endpoint().address());
m_proxy_addr.port(i->endpoint().port());
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// 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;
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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) return;
CHECK_MAGIC;
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TORRENT_ASSERT(is_single_thread());
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error_code ec;
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m_socks5_sock.close(ec);
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m_connection_ticket = -1;
}
void udp_socket::on_connect(int ticket)
{
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TORRENT_ASSERT(is_single_thread());
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
CHECK_MAGIC;
if (m_abort) return;
if (is_closed()) return;
if (ticket == -1)
{
close();
return;
}
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_connected");
#endif
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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;
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error_code ec;
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m_socks5_sock.open(m_proxy_addr.address().is_v4()?tcp::v4():tcp::v6(), ec);
++m_outstanding_ops;
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m_socks5_sock.async_connect(tcp::endpoint(m_proxy_addr.address(), m_proxy_addr.port())
, boost::bind(&udp_socket::on_connected, this, _1));
}
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void udp_socket::on_connected(error_code const& e)
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{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_connected");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
if (e == asio::error::operation_aborted) return;
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TORRENT_ASSERT(is_single_thread());
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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) return;
if (e)
{
call_handler(e, udp::endpoint(), 0, 0);
return;
}
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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;
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asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::handshake1, this, _1));
}
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void udp_socket::handshake1(error_code const& e)
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{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake1");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
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if (e) return;
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TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake2");
#endif
++m_outstanding_ops;
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asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake2, this, _1));
}
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void udp_socket::handshake2(error_code const& e)
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{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake2");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
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if (e) return;
using namespace libtorrent::detail;
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TORRENT_ASSERT(is_single_thread());
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char* p = &m_tmp_buf[0];
int version = read_uint8(p);
int method = read_uint8(p);
if (version < 5) return;
if (method == 0)
{
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socks_forward_udp(/*l*/);
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}
else if (method == 2)
{
if (m_proxy_settings.username.empty())
{
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error_code ec;
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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);
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;
2007-12-09 05:15:24 +01:00
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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error_code ec;
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m_socks5_sock.close(ec);
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return;
}
}
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void udp_socket::handshake3(error_code const& e)
2007-12-09 05:15:24 +01:00
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake3");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
2007-12-09 05:15:24 +01:00
if (e) return;
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TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::on_handshake4");
#endif
++m_outstanding_ops;
2007-12-09 05:15:24 +01:00
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 2)
, boost::bind(&udp_socket::handshake4, this, _1));
}
2008-05-03 18:05:42 +02:00
void udp_socket::handshake4(error_code const& e)
2007-12-09 05:15:24 +01:00
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::on_handshake4");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
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if (e) return;
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TORRENT_ASSERT(is_single_thread());
2007-12-09 05:15:24 +01:00
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;
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socks_forward_udp(/*l*/);
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}
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void udp_socket::socks_forward_udp()
2007-12-09 05:15:24 +01:00
{
CHECK_MAGIC;
2007-12-09 05:15:24 +01:00
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
2010-08-03 11:08:37 +02:00
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;
2007-12-09 05:15:24 +01:00
asio::async_write(m_socks5_sock, asio::buffer(m_tmp_buf, p - m_tmp_buf)
, boost::bind(&udp_socket::connect1, this, _1));
}
2008-05-03 18:05:42 +02:00
void udp_socket::connect1(error_code const& e)
2007-12-09 05:15:24 +01:00
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("udp_socket::connect1");
#endif
TORRENT_ASSERT(m_outstanding_ops > 0);
--m_outstanding_ops;
if (m_abort) return;
CHECK_MAGIC;
2007-12-09 05:15:24 +01:00
if (e) return;
2010-09-25 23:39:27 +02:00
TORRENT_ASSERT(is_single_thread());
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("udp_socket::connect2");
#endif
++m_outstanding_ops;
2007-12-09 05:15:24 +01:00
asio::async_read(m_socks5_sock, asio::buffer(m_tmp_buf, 10)
, boost::bind(&udp_socket::connect2, this, _1));
}
2008-05-03 18:05:42 +02:00
void udp_socket::connect2(error_code const& e)
2007-12-09 05:15:24 +01:00
{
#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();
return;
}
CHECK_MAGIC;
if (e)
{
m_queue.clear();
return;
}
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TORRENT_ASSERT(is_single_thread());
2007-12-09 05:15:24 +01:00
using namespace libtorrent::detail;
char* p = &m_tmp_buf[0];
int version = read_uint8(p); // VERSION
int status = read_uint8(p); // STATUS
++p; // RESERVED
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int atyp = read_uint8(p); // address type
if (version != 5 || status != 0)
{
m_queue.clear();
return;
}
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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;
2007-12-09 05:15:24 +01:00
}
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;
2010-08-03 11:08:37 +02:00
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);
2010-08-03 11:08:37 +02:00
}
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) return;
CHECK_MAGIC;
2010-09-25 23:39:27 +02:00
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);
2007-12-09 05:15:24 +01:00
}
rate_limited_udp_socket::rate_limited_udp_socket(io_service& ios
2010-08-03 11:08:37 +02:00
, connection_queue& cc)
: udp_socket(ios, cc)
, m_timer(ios)
2008-11-09 01:37:03 +01:00
, 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)
2008-11-09 01:37:03 +01:00
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;
2008-12-28 02:50:55 +01:00
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 += boost::uint64_t(m_rate_limit) * total_milliseconds(delta) / 1000;
if (m_queue.empty()) return;
2010-07-28 20:43:56 +02:00
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();
}
}
2008-11-08 22:44:24 +01:00
void rate_limited_udp_socket::close()
{
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error_code ec;
m_timer.cancel(ec);
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udp_socket::close();
}