Swift 4 域名解析 DNS

引用于GitHub：https://github.com/xiaoxiaocainiao/HostToIP/blob/master/HostToIP/ViewController.swift
这里又根据自己需要做了少许改动，在此感谢下作者的无私提供。

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        getIPAddress("www.baidu.com")
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // 域名解析
    func getIPAddress(domainName: String) -> String {
    var result = ""
        let host = CFHostCreateWithName(nil,domainName as CFString).takeRetainedValue()
        CFHostStartInfoResolution(host, .addresses, nil)
        var success: DarwinBoolean = false
        if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray?,
            let theAddress = addresses.firstObject as? NSData {
            var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
            if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length),
                           &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
                let numAddress = String(cString: hostname)
                result = numAddress
                print(numAddress)
            }
        }
        return result
    }

}

赏

谢谢你请我吃糖果

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