（ 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（Xpre 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}
