Swift 3如何解析NetService IP

Question

在swift 3中试试Bonjour

这是我的代码，我可以接收委托

func netServiceDidResolveAddress(_ sender: NetService) {
 print("netServiceDidResolveAddress service name (sender.name) of type (sender.type)," +
                "port (sender.port), addresses (sender.addresses)")
}

这是我的结果

netServiceDidResolveAddress服务名称Webber的Mac mini类型_myapp._tcp。，端口5678,addresses可选([<1002162e c0a80205 00000000 00000000>， <1c1e162e 00000000 fe800000 00000000 00bce7ad . cn)24 b4b7e8 08000000>)

c0a80205是我要找的IP => 192.168.2.5

地址是[Data]， Apple说

服务地址。这是NSData实例的NSArray，其中每个都包含一个适合使用的结构体sockaddr(2)连接。在没有解析地址的情况下服务或服务尚未解析，则为空NSArray返回。

我仍然困惑为什么Data不能使用。btyes ?苹果说"这是NSData实例的NSArray "但我不能像使用NSData

那样使用它

如何将地址解析为可读的IP字符串?

我以前尝试过，但没有得到结果，因为我除了…

let thedata = NSData(bytes: sender.addresses, length: (sender.addresses?.count)!)
var storage = sockaddr_storage()
thedata.getBytes(&storage, length: sizeof(sockaddr_storage))
if Int32(storage.ss_family) == AF_INET {
    let addr4 = withUnsafePointer(&storage) {UnsafePointer<sockaddr_in>($0).pointee }
    print(inet_ntoa(addr4.sin_addr));
}

任何建议都会有所帮助，谢谢

Answer 1

我在Swift 3中是这样做的。

func netServiceDidResolveAddress(_ sender: NetService) {
    var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
    guard let data = sender.addresses?.first else { return }
    data.withUnsafeBytes { (pointer:UnsafePointer<sockaddr>) -> Void in
        guard getnameinfo(pointer, socklen_t(data.count), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
            return
        }
    }
    let ipAddress = String(cString:hostname)
    print(ipAddress)
}

迅速5

var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
data.withUnsafeBytes { (pointer: UnsafeRawBufferPointer) -> Void in
        let sockaddrPtr = pointer.bindMemory(to: sockaddr.self)
        guard let unsafePtr = sockaddrPtr.baseAddress else { return }
        guard getnameinfo(unsafePtr, socklen_t(data.count), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
            return
        }
    }
let ipAddress = String(cString:hostname)
print(ipAddress)

Answer 2

编辑Phil Coles对Swift 5.0警告免费解决方案的回答:

func netServiceDidResolveAddress(_ sender: NetService) {
        var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
        guard let data = sender.addresses?.first else { return }
        data.withUnsafeBytes { ptr in
            guard let sockaddr_ptr = ptr.baseAddress?.assumingMemoryBound(to: sockaddr.self) else {
                // handle error
                return
            }
            var sockaddr = sockaddr_ptr.pointee
            guard getnameinfo(sockaddr_ptr, socklen_t(sockaddr.sa_len), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 else {
                return
            }
        }
        let ipAddress = String(cString:hostname)
        print(ipAddress)
    }

Answer 3

OK…这不是一个聪明的答案，至少我可以得到可读的IP

使用这个函数获取IP字符串

let bonjourDevices = [NetService]()
let bonjourDevice = bonjourDevices[0] 
let host = self.getIPV4StringfromAddress(address:bonjourDevice.addresses!)

func getIPV4StringfromAddress(address: [Data] , port : Int ) -> String{
        let data = address.first! as NSData;
        var ip1 = UInt8(0)
        data.getBytes(&ip1, range: NSMakeRange(4, 1))
        var ip2 = UInt8(0)
        data.getBytes(&ip2, range: NSMakeRange(5, 1))
        var ip3 = UInt8(0)
        data.getBytes(&ip3, range: NSMakeRange(6, 1))
        var ip4 = UInt8(0)
        data.getBytes(&ip4, range: NSMakeRange(7, 1))
        let ipStr = String(format: "%d.%d.%d.%d:%d",ip1,ip2,ip3,ip4,port);
        return ipStr;
    }

Answer 4

我不能使它与Data工作，但使用NSData，我会使用这个:

extension NSData {
    func castToCPointer<T>() -> T {
        let mem = UnsafeMutablePointer<T>.allocate(capacity: MemoryLayout<T.Type>.size)
        self.getBytes(mem, length: MemoryLayout<T.Type>.size)
         return mem.move()
    }
}

我们有netServiceDidResolveAddress:

func netServiceDidResolveAddress(_ sender: NetService) {
    if let addresses = sender.addresses, addresses.count > 0 {
        for address in addresses {
            let data = address as NSData
            let inetAddress: sockaddr_in = data.castToCPointer()
            if inetAddress.sin_family == __uint8_t(AF_INET) {
                if let ip = String(cString: inet_ntoa(inetAddress.sin_addr), encoding: .ascii) {
                    // IPv4
                    print(ip)
                }
            } else if inetAddress.sin_family == __uint8_t(AF_INET6) {
                let inetAddress6: sockaddr_in6 = data.castToCPointer()
                let ipStringBuffer = UnsafeMutablePointer<Int8>.allocate(capacity: Int(INET6_ADDRSTRLEN))
                var addr = inetAddress6.sin6_addr
                if let ipString = inet_ntop(Int32(inetAddress6.sin6_family), &addr, ipStringBuffer, __uint32_t(INET6_ADDRSTRLEN)) {
                    if let ip = String(cString: ipString, encoding: .ascii) {
                        // IPv6
                        print(ip)
                    }
                }
                ipStringBuffer.deallocate(capacity: Int(INET6_ADDRSTRLEN))
            }
        }
    }
}

我得到以下结果(在显示之前将ip存储在数组中):

["172.16.10.120", "172.16.8.251", "::", "::82c9:d9a5:2eed:1c87"]

受https://gist.github.com/agrippa1994/d8c66a2ded74fb2dd801启发的代码，在Swift 2.3中编写，并适用于Swift 3.0