Swift中利用域名获得IP地址

代码如下：

func dnsToIP() -> String? {
  let host = CFHostCreateWithName(nil, "baidu.com").takeRetainedValue()
  CFHostStartInfoResolution(host, .Addresses, nil)
  var success: Boolean = 0
  if let addressesCF = CFHostGetAddressing(host, &success) {
    let addresses = addressesCF.takeRetainedValue() as NSArray
    if addresses.count != 0 {
      let theAddress = addresses[0] as! NSData
      var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
      if getnameinfo(UnsafePointer(theAddress.bytes), socklen_t(theAddress.length), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
        if let numAddress = String.fromCString(hostname) {
          return numAddress
        }
      }
    }
  } else {
    NSLog("域名出错")
  }
  return nil
}

上述代码有些许漏洞，正在修正中，目前可使用Swift中利用域名获得IP地址 C方式

借鉴信息： http://stackoverflow.com/questions/25890533/how-can-i-get-a-real-ip-address-from-dns-query-in-swift

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