javascript - Nodejs如何检查一个地址是否是环回地址

Question

我正在尝试编写一个函数来返回网络中第一个非环回 ipv4 地址。除了检查地址是否是环回地址之外，我可以做所有事情，有什么办法可以做到这一点吗？这是我的功能:

function externalIP(){
  var addrs = os.networkInterfaces();
  var address = ""

  for(var key in addrs){
    for (var k in addrs[key]) {
      if(addrs[key][k].family == "IPv4"){
        console.log(addrs[key][k].address);
        /* HERE I NEED TO CHECK IF THE ADDRESS IS A LOOPBACK ADDRESS */
        address = addrs[key][k].address
        break
      }
    }
    // check if address is already set we can return the result
    if (address != ""){
      break
    }
  }

  return address
}

Answer 1

我最终只是在这里做了一个基于正则表达式的解决方案:

function externalIP() {
  var addrs = os.networkInterfaces();
  var address = ""

  for (var key in addrs) {
    for (var k in addrs[key]) {
      if (addrs[key][k].family == "IPv4") {
        // Check if loopback address
        var re = /^(127\.[\d.]+|[0:]+1|localhost)$/
        var result = addrs[key][k].address.match(re)
        if (result == null) {
          address = addrs[key][k].address;
          break
        }
      }
    }
    // If address is already set we can return the result
    if (address) {
      break
    }
  }

  return address
}