Question

我无法从MacOS上的Boost ASIO库运行多播示例。如果我按照代码本身的建议运行IPv6示例，则会收到以下错误：

./receiver 0::0 ff31::8000:1234
Exception: set_option: Can't assign requested address

按照代码中的建议使用IPv4地址时，可以正常使用。

我已经在Windows和Linux上使用过类似的代码，并且效果很好。现在，我正在MacOS上编译代码，它的破坏方式与官方示例代码相同。引发异常的行是这一行：

socket_.set_option(boost::asio::ip::multicast::join_group(multicast_address));

我无法理解失败的原因。

简化的示例代码（original source from boost.org）如下：

#include <array>
#include <iostream>
#include <string>
#include <boost/asio.hpp>

class receiver
{
public:
  receiver(boost::asio::io_context &io_context,
          const boost::asio::ip::address &listen_address,
          const boost::asio::ip::address &multicast_address)
      : socket_(io_context)
  {
    boost::asio::ip::udp::endpoint listen_endpoint(listen_address, 30001);
    socket_.open(listen_endpoint.protocol());
    socket_.set_option(boost::asio::ip::udp::socket::reuse_address(true));
    socket_.bind(listen_endpoint);

    // === THE FOLLOWING LINE FAILS ===
    socket_.set_option(boost::asio::ip::multicast::join_group(multicast_address));
  }

private:
  boost::asio::ip::udp::socket socket_;
  boost::asio::ip::udp::endpoint sender_endpoint_;
};


int main(int argc, char *argv[])
{
  try
  {
    if (argc != 3)
    {
      std::cerr << "Usage: receiver <listen_address> <multicast_address>\n";
      std::cerr << "  For IPv4, try:\n";
      std::cerr << "    receiver 0.0.0.0 239.255.0.1\n";
      std::cerr << "  For IPv6, try:\n";
      std::cerr << "    receiver 0::0 ff31::8000:1234\n";
      return 1;
    }

    boost::asio::io_context io_context;
    receiver r(io_context,
              boost::asio::ip::make_address(argv[1]),
              boost::asio::ip::make_address(argv[2]));
    io_context.run();
  }
  catch (std::exception &e)
  {
    std::cerr << "Exception: " << e.what() << "\n";
  }

  return 0;
}

我的机器有很多网络接口（我猜是从安装VirtualBox来的），我想知道它是否与它有关（替换了MAC地址）：

ifconfig

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
    options=1203<RXCSUM,TXCSUM,TXSTATUS,SW_TIMESTAMP>
    inet 127.0.0.1 netmask 0xff000000
    inet6 ::1 prefixlen 128
    inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
    nd6 options=201<PERFORMNUD,DAD>
gif0: flags=8010<POINTOPOINT,MULTICAST> mtu 1280
stf0: flags=0<> mtu 1280
XHC1: flags=0<> mtu 0
XHC0: flags=0<> mtu 0
XHC20: flags=0<> mtu 0
VHC128: flags=0<> mtu 0
en5: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether XX:XX:XX:XX:XX:XX
    inet6 fe80::aede:48ff:fe00:1122%en5 prefixlen 64 scopeid 0x8
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect (100baseTX <full-duplex>)
    status: active
ap1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
    ether XX:XX:XX:XX:XX:XX
    media: autoselect
    status: inactive
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether XX:XX:XX:XX:XX:XX
    inet6 fe80::18ae:f381:4c4c:62e6%en0 prefixlen 64 secured scopeid 0xa
    inet 192.168.43.242 netmask 0xffffff00 broadcast 192.168.43.255
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect
    status: active
p2p0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2304
    ether XX:XX:XX:XX:XX:XX
    media: autoselect
    status: inactive
awdl0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1484
    ether XX:XX:XX:XX:XX:XX
    inet6 fe80::2483:b4ff:fec9:2590%awdl0 prefixlen 64 scopeid 0xc
    nd6 options=201<PERFORMNUD,DAD>
    media: autoselect
    status: active
en1: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether XX:XX:XX:XX:XX:XX
    media: autoselect <full-duplex>
    status: inactive
en2: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether XX:XX:XX:XX:XX:XX
    media: autoselect <full-duplex>
    status: inactive
en3: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether XX:XX:XX:XX:XX:XX
    media: autoselect <full-duplex>
    status: inactive
en4: flags=8963<UP,BROADCAST,SMART,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
    options=60<TSO4,TSO6>
    ether XX:XX:XX:XX:XX:XX
    media: autoselect <full-duplex>
    status: inactive
bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    options=63<RXCSUM,TXCSUM,TSO4,TSO6>
    ether XX:XX:XX:XX:XX:XX
    Configuration:
        id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0
        maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200
        root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0
        ipfilter disabled flags 0x2
    member: en1 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 13 priority 0 path cost 0
    member: en2 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 14 priority 0 path cost 0
    member: en3 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 15 priority 0 path cost 0
    member: en4 flags=3<LEARNING,DISCOVER>
            ifmaxaddr 0 port 16 priority 0 path cost 0
    nd6 options=201<PERFORMNUD,DAD>
    media: <unknown type>
    status: inactive
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
    inet6 fe80::2f34:55e7:4eee:9260%utun0 prefixlen 64 scopeid 0x12
    nd6 options=201<PERFORMNUD,DAD>

在MacOS上出现Boost ASIO IPv6多播示例错误：无法分配请求的地址

0 个答案: