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// 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
}
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