swift - 使用 getifaddrs() 在 Swift 中找不到 Thunderbolt 到以太网适配器

Question

我有以下代码来获取我的 MacBook 上所有适配器的列表:

if getifaddrs(&addresses) == 0
        {
            let buffer = UnsafeBufferPointer(start: addresses, count: 16)
            for address in buffer
            {
                let rawData = address.ifa_data
                let name = address.ifa_name
                let socket: sockaddr = address.ifa_addr.pointee

                if rawData != nil && name != nil && socket.sa_family == UInt8(AF_LINK)
                {
                    let adapterName = String(utf8String: UnsafePointer<CChar>(name!))
                    let adapter = Adapter(name: adapterName!)
                    adapters.append(adapter)
                }
            }
        }

代码运行良好并且(几乎)所有适配器都被返回。如果使用 Thunderbolt 转以太网适配器，则不会返回此网络。

我怎样才能得到这个适配器？

Answer 1

您的代码假定 getifaddrs() 返回 struct ifaddrs 的数组，但事实并非如此。该函数存储对a的引用给定地址的链表，ifa_next 成员指向到下一个元素(或 nil 为最后一个元素)。

下面是一个如何遍历列表和存储接口(interface)的例子将名称放入数组(对 How to get Ip address in swift 中的代码进行修改):

func getInterfaceNames() -> [String] {

    var names = [String]()

    // Get list of all interfaces on the local machine:
    var ifaddr : UnsafeMutablePointer<ifaddrs>?
    guard getifaddrs(&ifaddr) == 0 else { return [] }
    guard let firstAddr = ifaddr else { return [] }

    // For each interface ...
    for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
        let addr = ptr.pointee.ifa_addr.pointee
        if addr.sa_family == UInt8(AF_LINK) {
            let name = String(cString: ptr.pointee.ifa_name)
            names.append(name)
        }
    }

    return names
}

在我的 iMac 上，这给出了

["lo0", "gif0", "stf0", "en1", "en2", "en3", "p2p0", "awdl0", "en0", "bridge0", "utun0"]

包括 Thunderbolt 网桥的“bridge0”，而您的代码只返回

"lo0", "gif0", "stf0", "en1"