// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd netbsd openbsd
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package net
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import (
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"syscall"
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"internal/x/net/route"
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)
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// If the ifindex is zero, interfaceTable returns mappings of all
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// network interfaces. Otherwise it returns a mapping of a specific
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// interface.
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func interfaceTable(ifindex int) ([]Interface, error) {
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msgs, err := interfaceMessages(ifindex)
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if err != nil {
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return nil, err
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}
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n := len(msgs)
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if ifindex != 0 {
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n = 1
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}
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ift := make([]Interface, n)
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n = 0
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for _, m := range msgs {
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switch m := m.(type) {
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case *route.InterfaceMessage:
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if ifindex != 0 && ifindex != m.Index {
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continue
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}
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ift[n].Index = m.Index
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ift[n].Name = m.Name
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ift[n].Flags = linkFlags(m.Flags)
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if sa, ok := m.Addrs[syscall.RTAX_IFP].(*route.LinkAddr); ok && len(sa.Addr) > 0 {
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ift[n].HardwareAddr = make([]byte, len(sa.Addr))
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copy(ift[n].HardwareAddr, sa.Addr)
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}
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for _, sys := range m.Sys() {
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if imx, ok := sys.(*route.InterfaceMetrics); ok {
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ift[n].MTU = imx.MTU
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break
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}
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}
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n++
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if ifindex == m.Index {
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return ift[:n], nil
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}
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}
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}
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return ift[:n], nil
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}
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func linkFlags(rawFlags int) Flags {
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var f Flags
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if rawFlags&syscall.IFF_UP != 0 {
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f |= FlagUp
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}
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if rawFlags&syscall.IFF_BROADCAST != 0 {
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f |= FlagBroadcast
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}
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if rawFlags&syscall.IFF_LOOPBACK != 0 {
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f |= FlagLoopback
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}
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if rawFlags&syscall.IFF_POINTOPOINT != 0 {
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f |= FlagPointToPoint
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}
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if rawFlags&syscall.IFF_MULTICAST != 0 {
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f |= FlagMulticast
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}
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return f
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}
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// If the ifi is nil, interfaceAddrTable returns addresses for all
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// network interfaces. Otherwise it returns addresses for a specific
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// interface.
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func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
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index := 0
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if ifi != nil {
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index = ifi.Index
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}
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msgs, err := interfaceMessages(index)
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if err != nil {
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return nil, err
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}
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ifat := make([]Addr, 0, len(msgs))
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for _, m := range msgs {
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switch m := m.(type) {
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case *route.InterfaceAddrMessage:
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if index != 0 && index != m.Index {
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continue
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}
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var mask IPMask
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switch sa := m.Addrs[syscall.RTAX_NETMASK].(type) {
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case *route.Inet4Addr:
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mask = IPv4Mask(sa.IP[0], sa.IP[1], sa.IP[2], sa.IP[3])
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case *route.Inet6Addr:
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mask = make(IPMask, IPv6len)
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copy(mask, sa.IP[:])
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}
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var ip IP
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switch sa := m.Addrs[syscall.RTAX_IFA].(type) {
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case *route.Inet4Addr:
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ip = IPv4(sa.IP[0], sa.IP[1], sa.IP[2], sa.IP[3])
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case *route.Inet6Addr:
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ip = make(IP, IPv6len)
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copy(ip, sa.IP[:])
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}
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if ip != nil && mask != nil { // NetBSD may contain route.LinkAddr
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ifat = append(ifat, &IPNet{IP: ip, Mask: mask})
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}
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}
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}
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return ifat, nil
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}
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