如何在Swift中从DNS查询中获取真实IP地址?
我想从Swift中的DNS查询中获取IP地址(例如192.168.0.1或87.12.56.50)。我用100种不同的方法尝试了100次…没有任何帮助,所以我必须寻求帮助。到目前为止,这是我的代码:
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);
}
回答:
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 ):
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
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。
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 = 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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