premiere-libtorrent/src/broadcast_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.
*/
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#include <boost/version.hpp>
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#include <boost/bind.hpp>
#include "libtorrent/socket.hpp"
#include "libtorrent/enum_net.hpp"
#include "libtorrent/broadcast_socket.hpp"
#include "libtorrent/assert.hpp"
#if defined TORRENT_ASIO_DEBUGGING
#include "libtorrent/debug.hpp"
#endif
#ifndef NDEBUG
//#include "libtorrent/socket_io.hpp"
#endif
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#if BOOST_VERSION < 103500
#include <asio/ip/host_name.hpp>
#include <asio/ip/multicast.hpp>
#else
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#include <boost/asio/ip/host_name.hpp>
#include <boost/asio/ip/multicast.hpp>
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#endif
namespace libtorrent
{
bool is_local(address const& a)
{
#if TORRENT_USE_IPV6
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if (a.is_v6()) return a.to_v6().is_link_local();
#endif
address_v4 a4 = a.to_v4();
unsigned long ip = a4.to_ulong();
return ((ip & 0xff000000) == 0x0a000000 // 10.x.x.x
|| (ip & 0xfff00000) == 0xac100000 // 172.16.x.x
|| (ip & 0xffff0000) == 0xc0a80000 // 192.168.x.x
|| (ip & 0xffff0000) == 0xa9fe0000 // 169.254.x.x
|| (ip & 0xff000000) == 0x7f000000); // 127.x.x.x
}
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bool is_loopback(address const& addr)
{
#if TORRENT_USE_IPV6
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if (addr.is_v4())
return addr.to_v4() == address_v4::loopback();
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else
return addr.to_v6() == address_v6::loopback();
#else
return addr.to_v4() == address_v4::loopback();
#endif
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}
bool is_multicast(address const& addr)
{
#if TORRENT_USE_IPV6
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if (addr.is_v4())
return addr.to_v4().is_multicast();
else
return addr.to_v6().is_multicast();
#else
return addr.to_v4().is_multicast();
#endif
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}
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bool is_any(address const& addr)
{
#if TORRENT_USE_IPV6
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if (addr.is_v4())
return addr.to_v4() == address_v4::any();
else if (addr.to_v6().is_v4_mapped())
return (addr.to_v6().to_v4() == address_v4::any());
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else
return addr.to_v6() == address_v6::any();
#else
return addr.to_v4() == address_v4::any();
#endif
}
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TORRENT_EXPORT bool is_teredo(address const& addr)
{
#if TORRENT_USE_IPV6
if (!addr.is_v6()) return false;
boost::uint8_t teredo_prefix[] = {0x20, 0x01, 0, 0};
address_v6::bytes_type b = addr.to_v6().to_bytes();
return memcmp(&b[0], teredo_prefix, 4) == 0;
#else
return false;
#endif
}
bool supports_ipv6()
{
#if TORRENT_USE_IPV6
error_code ec;
address::from_string("::1", ec);
return !ec;
#else
return false;
#endif
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}
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address guess_local_address(io_service& ios)
{
// make a best guess of the interface we're using and its IP
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error_code ec;
std::vector<ip_interface> const& interfaces = enum_net_interfaces(ios, ec);
address ret = address_v4::any();
for (std::vector<ip_interface>::const_iterator i = interfaces.begin()
, end(interfaces.end()); i != end; ++i)
{
address const& a = i->interface_address;
if (is_loopback(a)
|| is_multicast(a)
|| is_any(a)) continue;
// prefer a v4 address, but return a v6 if
// there are no v4
if (a.is_v4()) return a;
if (ret != address_v4::any())
ret = a;
}
return ret;
}
// count the length of the common bit prefix
int common_bits(unsigned char const* b1
, unsigned char const* b2, int n)
{
for (int i = 0; i < n; ++i, ++b1, ++b2)
{
unsigned char a = *b1 ^ *b2;
if (a == 0) continue;
int ret = i * 8 + 8;
for (; a > 0; a >>= 1) --ret;
return ret;
}
return n * 8;
}
// returns the number of bits in that differ from the right
// between the addresses. The larger number, the further apart
// the IPs are
int cidr_distance(address const& a1, address const& a2)
{
#if TORRENT_USE_IPV6
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if (a1.is_v4() && a2.is_v4())
{
#endif
// both are v4
address_v4::bytes_type b1 = a1.to_v4().to_bytes();
address_v4::bytes_type b2 = a2.to_v4().to_bytes();
return address_v4::bytes_type::static_size * 8
- common_bits(b1.c_array(), b2.c_array(), b1.size());
#if TORRENT_USE_IPV6
}
address_v6::bytes_type b1;
address_v6::bytes_type b2;
if (a1.is_v4()) b1 = address_v6::v4_mapped(a1.to_v4()).to_bytes();
else b1 = a1.to_v6().to_bytes();
if (a2.is_v4()) b2 = address_v6::v4_mapped(a2.to_v4()).to_bytes();
else b2 = a2.to_v6().to_bytes();
return address_v6::bytes_type::static_size * 8
- common_bits(b1.c_array(), b2.c_array(), b1.size());
#endif
}
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broadcast_socket::broadcast_socket(io_service& ios
, udp::endpoint const& multicast_endpoint
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, receive_handler_t const& handler
, bool loopback)
: m_multicast_endpoint(multicast_endpoint)
, m_on_receive(handler)
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, m_ip_broadcast(false)
{
TORRENT_ASSERT(is_multicast(m_multicast_endpoint.address()));
using namespace asio::ip::multicast;
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error_code ec;
std::vector<ip_interface> interfaces = enum_net_interfaces(ios, ec);
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#if TORRENT_USE_IPV6
if (multicast_endpoint.address().is_v6())
open_multicast_socket(ios, address_v6::any(), loopback, ec);
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else
#endif
open_multicast_socket(ios, address_v4::any(), loopback, ec);
for (std::vector<ip_interface>::const_iterator i = interfaces.begin()
, end(interfaces.end()); i != end; ++i)
{
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// only multicast on compatible networks
if (i->interface_address.is_v4() != multicast_endpoint.address().is_v4()) continue;
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// ignore any loopback interface
if (!loopback && is_loopback(i->interface_address)) continue;
ec = error_code();
open_multicast_socket(ios, i->interface_address, loopback, ec);
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#ifndef NDEBUG
// fprintf(stderr, "broadcast socket [ if: %s group: %s ] %s\n"
// , i->interface_address.to_string().c_str()
// , print_address(multicast_endpoint.address()).c_str()
// , ec.message().c_str());
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#endif
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open_unicast_socket(ios, i->interface_address
, i->netmask.is_v4() ? i->netmask.to_v4() : address_v4());
}
}
void broadcast_socket::enable_ip_broadcast(bool e)
{
if (e == m_ip_broadcast) return;
m_ip_broadcast = e;
asio::socket_base::broadcast option(m_ip_broadcast);
error_code ec;
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for (std::list<socket_entry>::iterator i = m_unicast_sockets.begin()
, end(m_unicast_sockets.end()); i != end; ++i)
{
if (!i->socket) continue;
i->socket->set_option(option, ec);
}
}
void broadcast_socket::open_multicast_socket(io_service& ios
, address const& addr, bool loopback, error_code& ec)
{
using namespace asio::ip::multicast;
boost::shared_ptr<datagram_socket> s(new datagram_socket(ios));
s->open(addr.is_v4() ? udp::v4() : udp::v6(), ec);
if (ec) return;
s->set_option(datagram_socket::reuse_address(true), ec);
if (ec) return;
s->bind(udp::endpoint(addr, m_multicast_endpoint.port()), ec);
if (ec) return;
s->set_option(join_group(m_multicast_endpoint.address()), ec);
if (ec) return;
s->set_option(hops(255), ec);
if (ec) return;
s->set_option(enable_loopback(loopback), ec);
if (ec) return;
m_sockets.push_back(socket_entry(s));
socket_entry& se = m_sockets.back();
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("broadcast_socket::on_receive");
#endif
s->async_receive_from(asio::buffer(se.buffer, sizeof(se.buffer))
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, se.remote, boost::bind(&broadcast_socket::on_receive, this, &se, _1, _2));
}
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void broadcast_socket::open_unicast_socket(io_service& ios, address const& addr
, address_v4 const& mask)
{
using namespace asio::ip::multicast;
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error_code ec;
boost::shared_ptr<datagram_socket> s(new datagram_socket(ios));
s->open(addr.is_v4() ? udp::v4() : udp::v6(), ec);
if (ec) return;
s->bind(udp::endpoint(addr, 0), ec);
if (ec) return;
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m_unicast_sockets.push_back(socket_entry(s, mask));
socket_entry& se = m_unicast_sockets.back();
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("broadcast_socket::on_receive");
#endif
s->async_receive_from(asio::buffer(se.buffer, sizeof(se.buffer))
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, se.remote, boost::bind(&broadcast_socket::on_receive, this, &se, _1, _2));
}
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void broadcast_socket::send(char const* buffer, int size, error_code& ec)
{
for (std::list<socket_entry>::iterator i = m_unicast_sockets.begin()
, end(m_unicast_sockets.end()); i != end; ++i)
{
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if (!i->socket) continue;
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error_code e;
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i->socket->send_to(asio::buffer(buffer, size), m_multicast_endpoint, 0, e);
#ifndef NDEBUG
// fprintf(stderr, " sending on unicast %s to: %s\n", print_address(i->socket->local_endpoint().address()).c_str()
// , print_endpoint(m_multicast_endpoint).c_str());
#endif
if (e)
{
#ifndef NDEBUG
// fprintf(stderr, " ERROR: %s\n", e.message().c_str());
#endif
i->socket->close(e);
i->socket.reset();
}
}
for (std::list<socket_entry>::iterator i = m_sockets.begin()
, end(m_sockets.end()); i != end; ++i)
{
if (!i->socket) continue;
error_code e;
i->socket->send_to(asio::buffer(buffer, size), m_multicast_endpoint, 0, e);
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if (m_ip_broadcast && i->socket->local_endpoint(e).address().is_v4())
i->socket->send_to(asio::buffer(buffer, size)
, udp::endpoint(i->broadcast_address(), m_multicast_endpoint.port()), 0, e);
#ifndef NDEBUG
// extern std::string print_address(address const& addr);
// extern std::string print_endpoint(udp::endpoint const& ep);
// fprintf(stderr, " sending on multicast %s to: %s\n", print_address(i->socket->local_endpoint().address()).c_str()
// , print_endpoint(m_multicast_endpoint).c_str());
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#endif
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if (e)
{
#ifndef NDEBUG
// fprintf(stderr, " ERROR: %s\n", e.message().c_str());
#endif
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i->socket->close(e);
i->socket.reset();
}
}
}
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void broadcast_socket::on_receive(socket_entry* s, error_code const& ec
, std::size_t bytes_transferred)
{
#if defined TORRENT_ASIO_DEBUGGING
complete_async("broadcast_socket::on_receive");
#endif
if (ec || bytes_transferred == 0 || !m_on_receive) return;
m_on_receive(s->remote, s->buffer, bytes_transferred);
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if (!s->socket) return;
#if defined TORRENT_ASIO_DEBUGGING
add_outstanding_async("broadcast_socket::on_receive");
#endif
s->socket->async_receive_from(asio::buffer(s->buffer, sizeof(s->buffer))
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, s->remote, boost::bind(&broadcast_socket::on_receive, this, s, _1, _2));
}
void broadcast_socket::close()
{
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std::for_each(m_sockets.begin(), m_sockets.end(), boost::bind(&socket_entry::close, _1));
std::for_each(m_unicast_sockets.begin(), m_unicast_sockets.end(), boost::bind(&socket_entry::close, _1));
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m_on_receive.clear();
}
}