func getIfaNetmask() -> String
{
var ifaNetmask = ""
// Get list of all interfaces on the local machine:
var ifaddr : UnsafeMutablePointer<ifaddrs>? = nil
if getifaddrs(&ifaddr) == 0 {
var ptr = ifaddr;
while ptr != nil {
let name = String.init(utf8String: ptr!.pointee.ifa_name) //[NSString stringWithUTF8String:ptr->ifa_name];
if (name == "en0")
{
let flags = Int32((ptr?.pointee.ifa_flags)!)
var addr = ptr?.pointee.ifa_addr.pointee
// Check for running IPv4, IPv6 interfaces. Skip the loopback interface.
if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
if addr?.sa_family == UInt8(AF_INET) || addr?.sa_family == UInt8(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?.sa_len)!), &hostname, socklen_t(hostname.count),
nil, socklen_t(0), NI_NUMERICHOST) == 0) {
if let address = String.init(validatingUTF8:hostname) {
var net = ptr?.pointee.ifa_netmask.pointee
var netmaskName = [CChar](repeating: 0, count: Int(NI_MAXHOST))
getnameinfo(&net!, socklen_t((net?.sa_len)!), &netmaskName, socklen_t(netmaskName.count),
nil, socklen_t(0), NI_NUMERICHOST)// == 0
if let netmask = String.init(validatingUTF8:netmaskName) {
print("address= \(address),netmask\(netmask)")
ifaNetmask = netmask
}
}
}
}
}
}
ptr = ptr?.pointee.ifa_next
}
freeifaddrs(ifaddr)
}
return ifaNetmask
}
這裏要說明"en0"是是什麼
