address bind_to_device(io_service& ios, Socket& sock
, bool ipv4, char const* device_name, int port, error_code& ec)
{
boost::asio::ip::tcp::endpoint bind_ep(address_v4::any(), port);
address ip = address::from_string(device_name, ec);
if (!ec)
{
bind_ep.address(ip);
// it appears to be an IP. Just bind to that address
sock.bind(bind_ep, ec);
return bind_ep.address();
}
ec.clear();
#ifdef SO_BINDTODEVICE
// try to use SO_BINDTODEVICE here, if that exists. If it fails,
// fall back to the mechanism we have below
sock.set_option(bind_to_device_opt(device_name), ec);
if (ec)
#endif
{
ec.clear();
// TODO: 2 this could be done more efficiently by just looking up
// the interface with the given name, maybe even with if_nametoindex()
std::vector<ip_interface> ifs = enum_net_interfaces(ios, ec);
if (ec) return bind_ep.address();
bool found = false;
for (int i = 0; i < int(ifs.size()); ++i)
{
// we're looking for a specific interface, and its address
// (which must be of the same family as the address we're
// connecting to)
if (strcmp(ifs[i].name, device_name) != 0) continue;
if (ifs[i].interface_address.is_v4() != ipv4)
continue;
bind_ep.address(ifs[i].interface_address);
found = true;
break;
}
if (!found)
{
ec = error_code(boost::system::errc::no_such_device, generic_category());
return bind_ep.address();
}
}
sock.bind(bind_ep, ec);
return bind_ep.address();
}
address bind_socket_to_device(io_service& ios, Socket& sock
, boost::asio::ip::tcp const& protocol
, char const* device_name, int port, error_code& ec)
{
tcp::endpoint bind_ep(address_v4::any(), std::uint16_t(port));
address ip = make_address(device_name, ec);
if (!ec)
{
#if TORRENT_USE_IPV6
// this is to cover the case where "0.0.0.0" is considered any IPv4 or
// IPv6 address. If we're asking to be bound to an IPv6 address and
// providing 0.0.0.0 as the device, turn it into "::"
if (ip == address_v4::any() && protocol == boost::asio::ip::tcp::v6())
ip = address_v6::any();
#endif
bind_ep.address(ip);
// it appears to be an IP. Just bind to that address
sock.bind(bind_ep, ec);
return bind_ep.address();
}
ec.clear();
#if TORRENT_HAS_BINDTODEVICE
// try to use SO_BINDTODEVICE here, if that exists. If it fails,
// fall back to the mechanism we have below
sock.set_option(aux::bind_to_device(device_name), ec);
if (ec)
#endif
{
ec.clear();
// TODO: 2 this could be done more efficiently by just looking up
// the interface with the given name, maybe even with if_nametoindex()
std::vector<ip_interface> ifs = enum_net_interfaces(ios, ec);
if (ec) return bind_ep.address();
bool found = false;
for (auto const& iface : ifs)
{
// we're looking for a specific interface, and its address
// (which must be of the same family as the address we're
// connecting to)
if (std::strcmp(iface.name, device_name) != 0) continue;
if (iface.interface_address.is_v4() != (protocol == boost::asio::ip::tcp::v4()))
continue;
bind_ep.address(iface.interface_address);
found = true;
break;
}
if (!found)
{
ec = error_code(boost::system::errc::no_such_device, generic_category());
return bind_ep.address();
}
}
sock.bind(bind_ep, ec);
return bind_ep.address();
}
