get IPAddress From Hotspot

getIPAddressFromHotspot.swift

//#include <ifaddrs.h> in bridging-header first.

fileprivate func getIPAddress() -> 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
            
            if Int32(interface.ifa_flags) & (IFF_LOOPBACK) == (IFF_LOOPBACK) {
                continue
            }
            
            if Int32(interface.ifa_flags) & (IFF_BROADCAST) != (IFF_BROADCAST) {
                continue
            }
            
            // 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)
                // Convert interface address to a human readable string:
                var addr = interface.ifa_addr.pointee
                var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                getnameinfo(&addr, socklen_t(interface.ifa_addr.pointee.sa_len),
                            &hostname, socklen_t(hostname.count),
                            nil, socklen_t(0), NI_NUMERICHOST)
                address?.append(String(cString: hostname) + "\n")
            }
        }
        freeifaddrs(ifaddr)

        return address.flatMap({$0})?.joined()
    }