boost::asio指定网卡加入多播组
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有两块网卡,要指定加入特定网卡的多播组。看了一下boost asio文档,例子中没有指定网卡:
boost::asio::ip::udp::socket socket(io_service);
...
boost::asio::ip::address multicast_address =
boost::asio::ip::address::from_string("225.0.0.1");
boost::asio::ip::multicast::join_group option(multicast_address);
socket.set_option(option);
再看源程序asio/ip/multicast.hpp, join_group是个类型定义
#if defined(GENERATING_DOCUMENTATION)
typedef implementation_defined join_group;
#else
typedef boost::asio::ip::detail::socket_option::multicast_request<<br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px"> IPPROTO_IP, IP_ADD_MEMBERSHIP, IPPROTO_IPV6, IPV6_JOIN_GROUP> join_group;
#endif
找到asio/ip/detail/socket_option.hpp,发现multicast_request类有成员函数
// Helper template for implementing ip_mreq-based options.
template
class multicast_request
{
public:
......
// Construct with multicast address and IPv4 address specifying an interface.
explicit multicast_request(
const boost::asio::ip::address_v4& multicast_address,
const boost::asio::ip::address_v4& network_interface
= boost::asio::ip::address_v4::any())
{
ipv4_value_.imr_multiaddr.s_addr =
boost::asio::detail::socket_ops::host_to_network_long(
multicast_address.to_ulong());
ipv4_value_.imr_interface.s_addr =
boost::asio::detail::socket_ops::host_to_network_long(
network_interface.to_ulong());
boost::asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
ipv6_value_.ipv6mr_multiaddr = tmp_addr;
ipv6_value_.ipv6mr_interface = 0;
}
一切搞定,指定network_interface就可以了。(在linux上)另外需要确保防火墙关闭,组播路由配置好。
看来asio的文档还是不够详细。
boost::asio::ip::udp::socket socket(io_service);
...
boost::asio::ip::address multicast_address =
boost::asio::ip::address::from_string("225.0.0.1");
boost::asio::ip::multicast::join_group option(multicast_address);
socket.set_option(option);
再看源程序asio/ip/multicast.hpp, join_group是个类型定义
#if defined(GENERATING_DOCUMENTATION)
typedef implementation_defined join_group;
#else
typedef boost::asio::ip::detail::socket_option::multicast_request<<br style="margin-top:0px; margin-right:0px; margin-bottom:0px; margin-left:0px; padding-top:0px; padding-right:0px; padding-bottom:0px; padding-left:0px"> IPPROTO_IP, IP_ADD_MEMBERSHIP, IPPROTO_IPV6, IPV6_JOIN_GROUP> join_group;
#endif
找到asio/ip/detail/socket_option.hpp,发现multicast_request类有成员函数
// Helper template for implementing ip_mreq-based options.
template
class multicast_request
{
public:
......
// Construct with multicast address and IPv4 address specifying an interface.
explicit multicast_request(
const boost::asio::ip::address_v4& multicast_address,
const boost::asio::ip::address_v4& network_interface
= boost::asio::ip::address_v4::any())
{
ipv4_value_.imr_multiaddr.s_addr =
boost::asio::detail::socket_ops::host_to_network_long(
multicast_address.to_ulong());
ipv4_value_.imr_interface.s_addr =
boost::asio::detail::socket_ops::host_to_network_long(
network_interface.to_ulong());
boost::asio::detail::in6_addr_type tmp_addr = IN6ADDR_ANY_INIT;
ipv6_value_.ipv6mr_multiaddr = tmp_addr;
ipv6_value_.ipv6mr_interface = 0;
}
一切搞定,指定network_interface就可以了。(在linux上)另外需要确保防火墙关闭,组播路由配置好。
看来asio的文档还是不够详细。
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