（ 备注/说明： 这是对 “管理ifaddrs在Swift中也返回MAC地址” 和 “是否可以修改
如何快速获取Ip地址中的代码 以也返回MAC地址” 的问题的答案 。 这不是 “检索连接到我的路由器的所有IP” 的解决方案，
问题正文中也提到了该解决方案。）

这是参考代码的扩展，该代码以 （接口名称，ip地址，MAC地址） 元组的数组形式返回本地（正在运行的接口 ）
。从类型的接口检索MAC地址，这些接口AF_LINK
作为sockaddr_dl结构存储在接口列表中。这是一个可变长度的结构，Swift的严格类型系统使指针变乱成为必要。

重要说明： 该代码旨在在Mac计算机上运行。在iOS设备上获取MAC地址不起作用。为了保护隐私，iOS 故意 为所有接口的硬件地址返回“02：00：00：00：00：00”作为硬件地址，

func getInterfaces() -> [(name : String, addr: String, mac : String)] {

    var addresses = [(name : String, addr: String, mac : String)]()
    var nameToMac = [ String : String ]()

    // Get list of all interfaces on the local machine:
    var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
    if getifaddrs(&ifaddr) == 0 {

        // For each interface ...
        var ptr = ifaddr
        while ptr != nil {
            defer { ptr = ptr.memory.ifa_next }

            let flags = Int32(ptr.memory.ifa_flags)
            let addr = ptr.memory.ifa_addr

            if let name = String.fromCString(ptr.memory.ifa_name)  {

                // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
                if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {

                    if addr.memory.sa_family == UInt8(AF_LINK) {
                        // Get MAC address from sockaddr_dl structure and store in nameToMac dictionary:
                        let dl = UnsafePointer<sockaddr_dl>(ptr.memory.ifa_addr)
                        let lladdr = UnsafeBufferPointer(start: UnsafePointer<Int8>(dl) + 8 + Int(dl.memory.sdl_nlen),
                                                         count: Int(dl.memory.sdl_alen))
                        if lladdr.count == 6 {
                            nameToMac[name] = lladdr.map { String(format:"%02hhx", $0)}.joinWithSeparator(":")
                        }
                    }

                    if addr.memory.sa_family == UInt8(AF_INET) || addr.memory.sa_family == UInt8(AF_INET6) {
                        // Convert interface address to a human readable string:
                        var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
                        if (getnameinfo(addr, socklen_t(addr.memory.sa_len), &hostname, socklen_t(hostname.count),
                            nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                            if let address = String.fromCString(hostname) {
                                addresses.append( (name: name, addr: address, mac : "") )
                            }
                        }
                    }
                }
            }
        }
        freeifaddrs(ifaddr)
    }

    // Now add the mac address to the tuples:
    for (i, addr) in addresses.enumerate() {
        if let mac = nameToMac[addr.name] {
            addresses[i] = (name: addr.name, addr: addr.addr, mac : mac)
        }
    }

    return addresses
}

您必须添加

#include <ifaddrs.h>
#include <net/if_dl.h>

到桥接头文件进行编译。

用法示例：

for addr in getInterfaces() {
   print(addr)
}
// ("en0", "fe80::1234:7fff:fe2e:8765%en0", "a9:55:6f:2e:57:78")
// ("en0", "192.168.2.108", "a9:55:6f:2e:57:78")
// ...

Swift 3（Xcode 8）更新：

func getInterfaces() -> [(name : String, addr: String, mac : String)] {

    var addresses = [(name : String, addr: String, mac : String)]()
    var nameToMac = [ String: 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 flags = Int32(ptr.pointee.ifa_flags)
        if let addr = ptr.pointee.ifa_addr {
            let name = String(cString: ptr.pointee.ifa_name)

            // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
            if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                switch Int32(addr.pointee.sa_family) {
                case AF_LINK:
                    // Get MAC address from sockaddr_dl structure and store in nameToMac dictionary:
                    addr.withMemoryRebound(to: sockaddr_dl.self, capacity: 1) { dl in
                        dl.withMemoryRebound(to: Int8.self, capacity: 8 + Int(dl.pointee.sdl_nlen + dl.pointee.sdl_alen)) {
                            let lladdr = UnsafeBufferPointer(start: $0 + 8 + Int(dl.pointee.sdl_nlen),
                                                             count: Int(dl.pointee.sdl_alen))
                            if lladdr.count == 6 {
                                nameToMac[name] = lladdr.map { String(format:"%02hhx", $0)}.joined(separator: ":")
                            }
                        }
                    }
                case AF_INET, AF_INET6:
                    // Convert interface address to a human readable string:
                    var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                    if (getnameinfo(addr, socklen_t(addr.pointee.sa_len),
                                    &hostname, socklen_t(hostname.count),
                                    nil, socklen_t(0), NI_NUMERICHOST) == 0) {
                        let address = String(cString: hostname)
                        addresses.append( (name: name, addr: address, mac : "") )
                    }
                default:
                    break
                }
            }
        }
    }

    freeifaddrs(ifaddr)

    // Now add the mac address to the tuples:
    for (i, addr) in addresses.enumerated() {
        if let mac = nameToMac[addr.name] {
            addresses[i] = (name: addr.name, addr: addr.addr, mac : mac)
        }
    }

    return addresses
}