// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net import ( "syscall" "golang.org/x/net/lif" ) // If the ifindex is zero, interfaceTable returns mappings of all // network interfaces. Otherwise it returns a mapping of a specific // interface. func interfaceTable(ifindex int) ([]Interface, error) { lls, err := lif.Links(syscall.AF_UNSPEC, "") if err != nil { return nil, err } var ift []Interface for _, ll := range lls { if ifindex != 0 && ifindex != ll.Index { continue } ifi := Interface{Index: ll.Index, MTU: ll.MTU, Name: ll.Name, Flags: linkFlags(ll.Flags)} if len(ll.Addr) > 0 { ifi.HardwareAddr = HardwareAddr(ll.Addr) } ift = append(ift, ifi) } return ift, nil } func linkFlags(rawFlags int) Flags { var f Flags if rawFlags&syscall.IFF_UP != 0 { f |= FlagUp } if rawFlags&syscall.IFF_RUNNING != 0 { f |= FlagRunning } if rawFlags&syscall.IFF_BROADCAST != 0 { f |= FlagBroadcast } if rawFlags&syscall.IFF_LOOPBACK != 0 { f |= FlagLoopback } if rawFlags&syscall.IFF_POINTOPOINT != 0 { f |= FlagPointToPoint } if rawFlags&syscall.IFF_MULTICAST != 0 { f |= FlagMulticast } return f } // If the ifi is nil, interfaceAddrTable returns addresses for all // network interfaces. Otherwise it returns addresses for a specific // interface. func interfaceAddrTable(ifi *Interface) ([]Addr, error) { var name string if ifi != nil { name = ifi.Name } as, err := lif.Addrs(syscall.AF_UNSPEC, name) if err != nil { return nil, err } var ifat []Addr for _, a := range as { var ip IP var mask IPMask switch a := a.(type) { case *lif.Inet4Addr: ip = IPv4(a.IP[0], a.IP[1], a.IP[2], a.IP[3]) mask = CIDRMask(a.PrefixLen, 8*IPv4len) case *lif.Inet6Addr: ip = make(IP, IPv6len) copy(ip, a.IP[:]) mask = CIDRMask(a.PrefixLen, 8*IPv6len) } ifat = append(ifat, &IPNet{IP: ip, Mask: mask}) } return ifat, nil } // interfaceMulticastAddrTable returns addresses for a specific // interface. func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) { return nil, nil }