Created
February 4, 2021 08:26
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// Return IP address of WiFi interface (en0) as a String, or `nil` | |
func getWiFiAddress() -> String? { | |
var address : String? | |
// Get list of all interfaces on the local machine: | |
var ifaddr : UnsafeMutablePointer<ifaddrs>? | |
guard getifaddrs(&ifaddr) == 0 else { return nil } | |
guard let firstAddr = ifaddr else { return nil } | |
// For each interface ... | |
for ifptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) { | |
let interface = ifptr.pointee | |
// Check for IPv4 or IPv6 interface: | |
let addrFamily = interface.ifa_addr.pointee.sa_family | |
if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) { | |
// Check interface name: | |
let name = String(cString: interface.ifa_name) | |
if name == "en0" { | |
// Convert interface address to a human readable string: | |
var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST)) | |
getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.pointee.sa_len), | |
&hostname, socklen_t(hostname.count), | |
nil, socklen_t(0), NI_NUMERICHOST) | |
address = String(cString: hostname) | |
} | |
} | |
} | |
freeifaddrs(ifaddr) | |
return address | |
} | |
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