如何从udp套接字（C / C ++）获取您自己的（本地）IP地址 [英] How to get your own (local) IP-Address from an udp-socket (C/C++)

问题描述

1. 您有多个网络适配器。


2. 将UDP套接字绑定到本地端口，而不指定地址。

<
如何获取收到数据包的适配器的本地ip地址？



问题是，来自接收器适配器的IP地址是什么？不是我们在

  receive_from（...，& senderAddr ...）中获得的发件人地址; 
  

调用

解决方案

您可以枚举所有网络适配器，获取其IP地址，并将子网掩码所覆盖的部分与发件人地址进行比较。





Like： / p>



  IPAddress FindLocalIPAddressOfIncomingPacket（senderAddr）
 {
 foreach（EnumAllNetworkAdapters（）中的适配器）
 { 
 adapterSubnet = adapter.subnetmask& adapter.ipaddress; 
 senderSubnet = adapter.subnetmask& senderAddr; 
 if（adapterSubnet == senderSubnet）
 {
 return adapter.ipaddress; 
} 
} 
} 
  




1. You have multiple network adapters.
2. Bind a UDP socket to an local port, without specifying an address.
3. Receive packets on one of the adapters.

How do you get the local ip address of the adapter which received the packet?

The question is, "What is the ip address from the receiver adapter?" not the address from the sender which we get in the

receive_from( ..., &senderAddr, ... );

call.

解决方案

You could enumerate all the network adapters, get their IP addresses and compare the part covered by the subnet mask with the sender's address.

Like:

IPAddress FindLocalIPAddressOfIncomingPacket( senderAddr )
{
    foreach( adapter in EnumAllNetworkAdapters() )
    {
        adapterSubnet = adapter.subnetmask & adapter.ipaddress;
        senderSubnet = adapter.subnetmask & senderAddr;
        if( adapterSubnet == senderSubnet )
        {
            return adapter.ipaddress;
        }
    }
}

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