如何在Swift中从DNS查询中获取真实IP地址？

如何在Swift中从DNS查询中获取真实IP地址？

您的代码将地址检索为“套接字地址”结构。

getnameinfo()

可用于将地址转换为数字IP字符串回收的代码，现已更新为Swift 2 ）：

let host = CFHostCreateWithName(nil,"www.google.com").takeRetainedValue()CFHostStartInfoResolution(host, .Addresses, nil)var success: DarwinBoolean = falseif 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

还要注意

takeRetainedValue()

第一行的用法，因为名称中

CFHostCreateWithName()

带有“
Create”，因此返回一个（+1）保留的对象。

---

Swift 3 / Xpre 8更新：

let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()CFHostStartInfoResolution(host, .addresses, nil)var success: DarwinBoolean = falseif 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，要获取主机的 所有 IP地址：

let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()CFHostStartInfoResolution(host, .addresses, nil)var success: DarwinBoolean = falseif 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)        }    }}