如何从Swift的DNS查询获取真正的IP地址？ [英] How can I get a real IP address from DNS query in Swift?

问题描述

我想从 Swift 中的DNS查询中获取IP连接（如192.168.0.1或87.12.56.50）。我尝试100次100种不同的方法...没有什么帮助我，所以我必须要求帮助（我希望这里有一些民间的）;
这是我的代码到目前为止：

I want to get the IP dress (like 192.168.0.1 or 87.12.56.50) from DNS query in Swift. I tried 100 times with 100 diffrent methods ... Nothing helped me, so I'll have to ask for help (I hope there are alots of folk here ;)) This is my code so far:

let host = CFHostCreateWithName(nil,"subdomain.of.stackoverflow.com").takeUnretainedValue();
CFHostStartInfoResolution(host, .Addresses, nil);
var success: Boolean = 0;
let addresses = CFHostGetAddressing(host, &success).takeUnretainedValue() as NSArray;
if(addresses.count > 0){
   let theAddress = addresses[0] as NSData;
   println(theAddress);
}

OK ...这些是我试图实现的代码的链接，没有成功：
https://gist.github.com/mikeash/bca3a341db74221625f5 < br>
如何在iOS上执行DNS查询 < br>
从NSData创建Swift中的数组对象

CFHostGetAddressing（）是否支持ipv6 DNS条目？

执行简单的DNS查找Swift

所以如果我们完成了对这个问题的无意义的负面投票，我们可以尝试找到一个解决方案并帮助别人（li ke我）

OK ... These are the links for the code I tried to implement without success: https://gist.github.com/mikeash/bca3a341db74221625f5
How to perform DNS query on iOS
Create an Array in Swift from an NSData Object
Does CFHostGetAddressing() support ipv6 DNS entries?
Do a simple DNS lookup in Swift
So if we're done with nonsensical negative voting for this question we can try to find a solution and help other people (like me)

推荐答案

您的代码将地址作为套接字地址结构检索。
getnameinfo（）可用于将地址转换为数字IP字符串
（代码从 https://stackoverflow.com/a/25627545/1187415 ，
现已更新为 Swift 2 ）：

Your code retrieves the address as a "socket address" structure. getnameinfo() can be used to convert the address into a numerical IP string (code recycled from https://stackoverflow.com/a/25627545/1187415, now updated to Swift 2):

let host = CFHostCreateWithName(nil,"www.google.com").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](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) {
                print(numAddress)
            }
    }
}

输出（示例）： 173.194。 112.147

请注意第一行中 takeRetainedValue（）的用法，因为
CFHostCreateWithName（）在其名称中具有创建，因此返回一个（+1）保留的
对象。

Note also the usage of takeRetainedValue() in the first line, because CFHostCreateWithName() has "Create" in its name the therefore returns a (+1) retained object.

Swift 3 / Xcode 8的更新：

let host = CFHostCreateWithName(nil,"www.google.com" 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)
        print(numAddress)
    }
}

或者，要获取所有 IP地址对于主持人：

Or, to get all IP addresses for the host:

let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()
CFHostStartInfoResolution(host, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray? {
    for case let theAddress as NSData in addresses {
        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)
            print(numAddress)
        }
    }
}

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