func readLoop(c *ipv4.PacketConn) {
log.Printf("readLoop: reading")
buf := make([]byte, 10000)
for {
n, cm, _, err1 := c.ReadFrom(buf)
if err1 != nil {
log.Printf("readLoop: ReadFrom: error %v", err1)
break
}
var name string
ifi, err2 := net.InterfaceByIndex(cm.IfIndex)
if err2 != nil {
log.Printf("readLoop: unable to solve ifIndex=%d: error: %v", cm.IfIndex, err2)
}
if ifi == nil {
name = "ifname?"
} else {
name = ifi.Name
}
log.Printf("readLoop: recv %d bytes from %s to %s on %s", n, cm.Src, cm.Dst, name)
}
log.Printf("readLoop: exiting")
}
func getDefaultGatewayIface() *net.Interface {
log.Debug("Attempting to retrieve IP route info from netlink")
routes, err := netlink.RouteList(nil, 0)
if err != nil {
log.Debugf("Unable to detect default interface: %v", err)
return nil
}
if len(routes) == 0 {
log.Debugf("Netlink returned zero routes")
return nil
}
for _, route := range routes {
// a nil Dst means that this is the default route.
if route.Dst == nil {
i, err := net.InterfaceByIndex(route.LinkIndex)
if err != nil {
log.Debugf("Found default route but could not determine interface")
continue
}
log.Debugf("Found default route with interface %v", i)
return i
}
}
log.Debugf("Unable to find default route")
return nil
}
func udpReader(c *ipv4.PacketConn, ifname, hostPort string) {
log.Printf("udpReader: reading multicast")
defer c.Close()
buf := make([]byte, 10000)
for {
n, cm, _, err1 := c.ReadFrom(buf)
if err1 != nil {
log.Printf("udpReader: ReadFrom: error %v", err1)
break
}
ifi, err2 := net.InterfaceByIndex(cm.IfIndex)
if err2 != nil {
log.Printf("udpReader: could not solve ifindex=%d: %v", cm.IfIndex, err2)
}
ifname := "ifname?"
if ifi != nil {
ifname = ifi.Name
}
log.Printf("udpReader: recv %d bytes from %s to %s on %s (ifindex=%d)", n, cm.Src, cm.Dst, ifname, cm.IfIndex)
}
log.Printf("udpReader: exiting")
}
func findPairInterfaceOfContainerInterface(e exec.Interface, containerInterfaceName, containerDesc string, nsenterArgs []string) (string, error) {
nsenterPath, err := e.LookPath("nsenter")
if err != nil {
return "", err
}
ethtoolPath, err := e.LookPath("ethtool")
if err != nil {
return "", err
}
nsenterArgs = append(nsenterArgs, "-F", "--", ethtoolPath, "--statistics", containerInterfaceName)
output, err := e.Command(nsenterPath, nsenterArgs...).CombinedOutput()
if err != nil {
return "", fmt.Errorf("Unable to query interface %s of container %s: %v: %s", containerInterfaceName, containerDesc, err, string(output))
}
// look for peer_ifindex
match := ethtoolOutputRegex.FindSubmatch(output)
if match == nil {
return "", fmt.Errorf("No peer_ifindex in interface statistics for %s of container %s", containerInterfaceName, containerDesc)
}
peerIfIndex, err := strconv.Atoi(string(match[1]))
if err != nil { // seems impossible (\d+ not numeric)
return "", fmt.Errorf("peer_ifindex wasn't numeric: %s: %v", match[1], err)
}
iface, err := net.InterfaceByIndex(peerIfIndex)
if err != nil {
return "", err
}
return iface.Name, nil
}
func ExampleWriteIPOSPFHello() {
var ifs []*net.Interface
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en0)
en1, err := net.InterfaceByIndex(911)
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en1)
c, err := net.ListenPacket("ip4:89", "0.0.0.0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
for _, ifi := range ifs {
err := r.JoinGroup(ifi, &net.IPAddr{IP: AllSPFRouters})
if err != nil {
log.Fatal(err)
}
err = r.JoinGroup(ifi, &net.IPAddr{IP: AllDRouters})
if err != nil {
log.Fatal(err)
}
}
hello := make([]byte, OSPFHelloHeaderLen)
ospf := make([]byte, OSPFHeaderLen)
ospf[0] = OSPF_VERSION
ospf[1] = OSPF_TYPE_HELLO
ospf = append(ospf, hello...)
iph := &ipv4.Header{}
iph.Version = ipv4.Version
iph.Len = ipv4.HeaderLen
iph.TOS = ipv4.DSCP_CS6
iph.TotalLen = ipv4.HeaderLen + len(ospf)
iph.TTL = 1
iph.Protocol = 89
iph.Dst = AllSPFRouters
for _, ifi := range ifs {
err := r.SetMulticastInterface(ifi)
if err != nil {
return
}
err = r.WriteTo(iph, ospf, nil)
if err != nil {
return
}
}
}
// IP6ZoneToString converts an IP6 Zone syscall int to a net string
// returns "" if zone is 0
func IP6ZoneToString(zone int) string {
if zone == 0 {
return ""
}
if ifi, err := net.InterfaceByIndex(zone); err == nil {
return ifi.Name
}
return itod(uint(zone))
}
func udpReader(c *ipv4.PacketConn, input chan<- *udpInfo, ifname string, readerDone chan<- int, listenPort int) {
log.Printf("udpReader: reading from '%s'", ifname)
defer c.Close()
buf := make([]byte, 10000)
LOOP:
for {
n, cm, srcAddr, err1 := c.ReadFrom(buf)
if err1 != nil {
log.Printf("udpReader: ReadFrom: error %v", err1)
break LOOP
}
var udpSrc *net.UDPAddr
switch srcAddr.(type) {
case *net.UDPAddr:
udpSrc = srcAddr.(*net.UDPAddr)
}
var name string
var ifi *net.Interface
var err2 error
if cm != nil {
ifi, err2 = net.InterfaceByIndex(cm.IfIndex)
if err2 != nil {
log.Printf("udpReader: unable to solve ifIndex=%d: error: %v", cm.IfIndex, err2)
}
}
if ifi == nil {
name = "ifname?"
} else {
name = ifi.Name
}
udpDst := net.UDPAddr{IP: cm.Dst, Port: listenPort}
//log.Printf("udpReader: recv %d bytes from %v to %v on %s ifIndex=%d", n, udpSrc, &udpDst, name, cm.IfIndex)
// make a copy because we will overwrite buf
b := make([]byte, n)
copy(b, buf)
// deliver udp packet to main rip goroutine
input <- &udpInfo{info: b, src: *udpSrc, dst: udpDst, ifIndex: cm.IfIndex, ifName: name}
}
log.Printf("udpReader: exiting '%s' -- trying", ifname)
readerDone <- 1 // tell rip router goroutine
log.Printf("udpReader: exiting '%s'", ifname)
}
func ipv4MulticastInterface(fd int) (*net.Interface, error) {
mreqn, err := syscall.GetsockoptIPMreqn(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if int(mreqn.Ifindex) == 0 {
return nil, nil
}
return net.InterfaceByIndex(int(mreqn.Ifindex))
}
// Interface returns the associated network interface.
func (c *Conn) Interface() (*net.Interface, error) {
if !c.ok() {
return nil, syscall.EINVAL
}
ifi, err := net.InterfaceByIndex(c.ifindex)
if err != nil {
return nil, err
}
return ifi, nil
}
func ipv4MulticastInterface(fd int) (*net.Interface, error) {
mreqn, err := syscall.GetsockoptIPMreqn(fd, ianaProtocolIP, sysSockoptMulticastInterface)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if mreqn.Ifindex == 0 {
return nil, nil
}
return net.InterfaceByIndex(int(mreqn.Ifindex))
}
func ipv6MulticastInterface(fd int) (*net.Interface, error) {
v, err := syscall.GetsockoptInt(fd, ianaProtocolIPv6, syscall.IPV6_MULTICAST_IF)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if v == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(v)
if err != nil {
return nil, err
}
return ifi, nil
}
func getMacAddr() (mac [6]uint8, err error) {
ifaces, _ := net.Interfaces()
for i := range ifaces {
iface, err := net.InterfaceByIndex(i + 1)
if err != nil {
log.Println(err, i)
break
}
log.Println(iface.HardwareAddr)
}
return
}
func getsockoptIPMreqn(s uintptr, name int) (*net.Interface, error) {
var mreqn ipMreqn
l := uint32(sizeofIPMreqn)
if err := getsockopt(s, iana.ProtocolIP, name, unsafe.Pointer(&mreqn), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if mreqn.Ifindex == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(mreqn.Ifindex))
if err != nil {
return nil, err
}
return ifi, nil
}
func ipv6MulticastInterface(fd syscall.Handle) (*net.Interface, error) {
var v int32
l := int32(4)
if err := syscall.Getsockopt(fd, int32(ianaProtocolIPv6), int32(syscall.IPV6_MULTICAST_IF), (*byte)(unsafe.Pointer(&v)), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if v == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(v))
if err != nil {
return nil, err
}
return ifi, nil
}
//Perform RARP reassign
func broadcastChange(li netlink.Link, en endpoint) error {
cif, err := net.InterfaceByIndex(li.Attrs().Index)
if err != nil {
return fmt.Errorf("could not rediscover interface by index %d (%s): %v", li.Attrs().Index, li.Attrs().Name, err)
}
carp, err := arp.NewClient(cif)
if err != nil {
return fmt.Errorf("could not bind arp client to interface %s: %v", li.Attrs().Name, err)
}
//Broadcast change of ip mac pair
Log.Infof("Doing broadcast for ip: %v, mac: %v", en.addr, en.mac)
defer carp.Close()
return carp.BroadcastChange(en.addr, en.mac)
}
func ipv6MulticastInterface(fd int) (*net.Interface, error) {
var v int32
l := sysSockoptLen(4)
if err := getsockopt(fd, ianaProtocolIPv6, sysSockoptMulticastInterface, unsafe.Pointer(&v), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if v == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(v))
if err != nil {
return nil, err
}
return ifi, nil
}
func isLocalLinkLocalAddress(ifindex int, addr net.IP) (bool, error) {
ifi, err := net.InterfaceByIndex(ifindex)
if err != nil {
return false, err
}
addrs, err := ifi.Addrs()
if err != nil {
return false, err
}
for _, a := range addrs {
if ip, _, _ := net.ParseCIDR(a.String()); addr.Equal(ip) {
return true, nil
}
}
return false, nil
}
func GetDefaultGatewayIface() (*net.Interface, error) {
routes, err := netlink.RouteList(nil, syscall.AF_INET)
if err != nil {
return nil, err
}
for _, route := range routes {
if route.Dst == nil || route.Dst.String() == "0.0.0.0/0" {
if route.LinkIndex <= 0 {
return nil, errors.New("Found default route but could not determine interface")
}
return net.InterfaceByIndex(route.LinkIndex)
}
}
return nil, errors.New("Unable to find default route")
}
// getDefaultRouteMtu returns the MTU for the default route's interface.
func getDefaultRouteMtu() (int, error) {
routes, err := netlink.RouteList(nil, 0)
if err != nil {
return 0, err
}
for _, r := range routes {
// a nil Dst means that this is the default route.
if r.Dst == nil {
i, err := net.InterfaceByIndex(r.LinkIndex)
if err != nil {
continue
}
return i.MTU, nil
}
}
return 0, errNoDefaultRoute
}
func getMTUInfo(s uintptr, opt *sockOpt) (*net.Interface, int, error) {
if opt.name < 1 || opt.typ != ssoTypeMTUInfo {
return nil, 0, errOpNoSupport
}
var mi sysIPv6Mtuinfo
l := uint32(sysSizeofIPv6Mtuinfo)
if err := getsockopt(s, opt.level, opt.name, unsafe.Pointer(&mi), &l); err != nil {
return nil, 0, os.NewSyscallError("getsockopt", err)
}
if mi.Addr.Scope_id == 0 {
return nil, int(mi.Mtu), nil
}
ifi, err := net.InterfaceByIndex(int(mi.Addr.Scope_id))
if err != nil {
return nil, 0, err
}
return ifi, int(mi.Mtu), nil
}
func getInterface(s uintptr, opt *sockOpt) (*net.Interface, error) {
if opt.name < 1 || opt.typ != ssoTypeInterface {
return nil, errOpNoSupport
}
var i int32
l := uint32(4)
if err := getsockopt(s, opt.level, opt.name, unsafe.Pointer(&i), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if i == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(i))
if err != nil {
return nil, err
}
return ifi, nil
}
func getInterface(fd syscall.Handle, opt *sockOpt) (*net.Interface, error) {
if opt.name < 1 || opt.typ != ssoTypeInterface {
return nil, errOpNoSupport
}
var i int32
l := int32(4)
if err := syscall.Getsockopt(fd, int32(opt.level), int32(opt.name), (*byte)(unsafe.Pointer(&i)), &l); err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
if i == 0 {
return nil, nil
}
ifi, err := net.InterfaceByIndex(int(i))
if err != nil {
return nil, err
}
return ifi, nil
}
func main() {
routes, err := netlink.RouteList(nil, 0)
if err != nil {
fmt.Println("netlink.RouteList: ", err)
return
}
for _, r := range routes {
// a nil Dst means that this is the default route.
if r.Dst == nil {
fmt.Println(r)
i, err := net.InterfaceByIndex(r.LinkIndex)
if err != nil {
fmt.Println("net.InterfaceByIndex", r.LinkIndex, err)
continue
}
fmt.Println(i)
return
}
}
return
}
// newNeighbor attempts to parse a netlink message into a Neighbor.
func newNeighbor(m *syscall.NetlinkMessage) (*Neighbor, error) {
// Gather netlink route attributes from message
attrs, err := parseNetlinkRouteAttr(m)
if err != nil {
return nil, err
}
// Iterate attributes in search of values for MAC address and IP
// address; other values can be inferred by ndmsg struct directly
var ip net.IP
var mac net.HardwareAddr
for _, a := range attrs {
if a.Attr.Type == ndaDST {
ip = net.IP(a.Value)
}
if a.Attr.Type == ndaLLADDR {
mac = net.HardwareAddr(a.Value)
}
}
// Cast raw data into a ndmsg struct to obtain more information for
// a Neighbor
ndm := (*ndmsg)(unsafe.Pointer(&m.Data[0]))
// Retrieve local interface designated by index, indicating which interface
// contacted this neighbor
ifi, err := net.InterfaceByIndex(int(ndm.IfIndex))
if err != nil {
return nil, err
}
return &Neighbor{
Interface: ifi,
IP: ip,
HardwareAddr: mac,
Flags: Flags(ndm.Flags),
State: State(ndm.State),
}, nil
}
func GetRouteList(cResp chan<- *Response, rawArgs *json.RawMessage, tag string) {
args := &struct {
Family int `json:"family"`
}{}
json.Unmarshal(*rawArgs, &args)
var family int
switch args.Family {
case netlink.FAMILY_ALL, netlink.FAMILY_V4, netlink.FAMILY_V6:
family = args.Family
}
rlist, err := netlink.RouteList(nil, family)
if err != nil {
cResp <- &Response{nil, tag, NewRTNetlinkError(err)}
return
}
rlist2 := make([]Route, 0, len(rlist))
for _, r := range rlist {
link, _ := net.InterfaceByIndex(r.LinkIndex)
var n IPNet
if r.Dst != nil {
n = IPNet(*r.Dst)
}
r2 := Route{
Ifname: link.Name,
Scope: r.Scope,
Dst: &n,
Src: r.Src,
Gw: r.Gw,
}
rlist2 = append(rlist2, r2)
}
cResp <- &Response{rlist2, tag, nil}
}
func main() {
// syscall.GetHostByName("codyguo")
const maxSiz = 50
var n uint32 = maxSiz
buf := make([]uint16, maxSiz)
syscall.GetComputerName(&buf[0], &n)
name := syscall.UTF16ToString(buf)
fmt.Println(name)
tmp, _ := net.InterfaceByName("以太网")
tmp2, _ := net.InterfaceByIndex(3)
inters, _ := net.Interfaces()
fmt.Println(inters)
fmt.Println(inters[0])
fmt.Println(tmp2)
fmt.Println(tmp)
type s struct {
Description string
SettingID string
MACAddress string
// ArpAlwaysSourceRoute string
// ArpUseEtherSNAP int
// DefaultIPGateway []string
// DefaultTOS uint8
// DHCPEnabled int
}
var dst []s
err := wmi.Query("SELECT * FROM Win32_NetworkAdapterConfiguration", &dst)
if err != nil {
fmt.Println("Expected err field mismatch", err)
return
}
for _, s := range dst {
fmt.Println(s)
}
}
func InterfaceIP(ifIdx int) (net.IP, error) {
iface, err := net.InterfaceByIndex(ifIdx)
if err != nil {
return nil, err
}
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
// Try to find an IPv4 address to use, in the following order:
// global unicast (includes rfc1918), link-local unicast,
// loopback.
fs := [](func(net.IP) bool){
net.IP.IsGlobalUnicast,
net.IP.IsLinkLocalUnicast,
net.IP.IsLoopback,
}
for _, f := range fs {
for _, a := range addrs {
ipaddr, ok := a.(*net.IPNet)
if !ok {
continue
}
ip := ipaddr.IP.To4()
if ip == nil {
continue
}
if f(ip) {
return ip, nil
}
}
}
return nil, fmt.Errorf("interface %s has no usable unicast addresses", iface.Name)
}
func ExampleMulticastUDPListener() {
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
en1, err := net.InterfaceByIndex(911)
if err != nil {
log.Fatal(err)
}
group := net.IPv4(224, 0, 0, 250)
c, err := net.ListenPacket("udp4", "0.0.0.0:1024")
if err != nil {
log.Fatal(err)
}
defer c.Close()
p := ipv4.NewPacketConn(c)
err = p.JoinGroup(en0, &net.UDPAddr{IP: group})
if err != nil {
log.Fatal(err)
}
err = p.JoinGroup(en1, &net.UDPAddr{IP: group})
if err != nil {
log.Fatal(err)
}
err = p.SetControlMessage(ipv4.FlagDst, true)
if err != nil {
log.Fatal(err)
}
b := make([]byte, 1500)
for {
n, cm, src, err := p.ReadFrom(b)
if err != nil {
log.Fatal(err)
}
if cm.Dst.IsMulticast() {
if cm.Dst.Equal(group) {
// joined group, do something
} else {
// unknown group, discard
continue
}
}
p.SetTOS(ipv4.DSCP_CS7)
p.SetTTL(16)
_, err = p.WriteTo(b[:n], nil, src)
if err != nil {
log.Fatal(err)
}
dst := &net.UDPAddr{IP: group, Port: 1024}
for _, ifi := range []*net.Interface{en0, en1} {
err := p.SetMulticastInterface(ifi)
if err != nil {
log.Fatal(err)
}
p.SetMulticastTTL(2)
_, err = p.WriteTo(b[:n], nil, dst)
if err != nil {
log.Fatal(err)
}
}
}
err = p.LeaveGroup(en1, &net.UDPAddr{IP: group})
if err != nil {
log.Fatal(err)
}
newgroup := net.IPv4(224, 0, 0, 249)
err = p.JoinGroup(en1, &net.UDPAddr{IP: newgroup})
if err != nil {
log.Fatal(err)
}
}
func ExampleIPOSPFListener() {
var ifs []*net.Interface
en0, err := net.InterfaceByName("en0")
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en0)
en1, err := net.InterfaceByIndex(911)
if err != nil {
log.Fatal(err)
}
ifs = append(ifs, en1)
c, err := net.ListenPacket("ip4:89", "0.0.0.0")
if err != nil {
log.Fatal(err)
}
defer c.Close()
r, err := ipv4.NewRawConn(c)
if err != nil {
log.Fatal(err)
}
for _, ifi := range ifs {
err := r.JoinGroup(ifi, &net.IPAddr{IP: AllSPFRouters})
if err != nil {
log.Fatal(err)
}
err = r.JoinGroup(ifi, &net.IPAddr{IP: AllDRouters})
if err != nil {
log.Fatal(err)
}
}
err = r.SetControlMessage(ipv4.FlagDst|ipv4.FlagInterface, true)
if err != nil {
log.Fatal(err)
}
r.SetTOS(ipv4.DSCP_CS6)
parseOSPFHeader := func(b []byte) *OSPFHeader {
if len(b) < OSPFHeaderLen {
return nil
}
return &OSPFHeader{
Version: b[0],
Type: b[1],
Len: uint16(b[2])<<8 | uint16(b[3]),
RouterID: uint32(b[4])<<24 | uint32(b[5])<<16 | uint32(b[6])<<8 | uint32(b[7]),
AreaID: uint32(b[8])<<24 | uint32(b[9])<<16 | uint32(b[10])<<8 | uint32(b[11]),
Checksum: uint16(b[12])<<8 | uint16(b[13]),
}
}
b := make([]byte, 1500)
for {
iph, p, _, err := r.ReadFrom(b)
if err != nil {
log.Fatal(err)
}
if iph.Version != ipv4.Version {
continue
}
if iph.Dst.IsMulticast() {
if !iph.Dst.Equal(AllSPFRouters) && !iph.Dst.Equal(AllDRouters) {
continue
}
}
ospfh := parseOSPFHeader(p)
if ospfh == nil {
continue
}
if ospfh.Version != OSPF_VERSION {
continue
}
switch ospfh.Type {
case OSPF_TYPE_HELLO:
case OSPF_TYPE_DB_DESCRIPTION:
case OSPF_TYPE_LS_REQUEST:
case OSPF_TYPE_LS_UPDATE:
case OSPF_TYPE_LS_ACK:
}
}
}
// Returns an array of IPNet for all the currently routed subnets on ipv4
// This is similar to the first column of "ip route" output
func NetworkGetRoutes() ([]Route, error) {
native := nativeEndian()
s, err := getNetlinkSocket()
if err != nil {
return nil, err
}
defer s.Close()
wb := newNetlinkRequest(syscall.RTM_GETROUTE, syscall.NLM_F_DUMP)
msg := newIfInfomsg(syscall.AF_UNSPEC)
wb.AddData(msg)
if err := s.Send(wb); err != nil {
return nil, err
}
pid, err := s.GetPid()
if err != nil {
return nil, err
}
res := make([]Route, 0)
done:
for {
msgs, err := s.Receive()
if err != nil {
return nil, err
}
for _, m := range msgs {
if m.Header.Seq != wb.Seq {
return nil, fmt.Errorf("Wrong Seq nr %d, expected 1", m.Header.Seq)
}
if m.Header.Pid != pid {
return nil, fmt.Errorf("Wrong pid %d, expected %d", m.Header.Pid, pid)
}
if m.Header.Type == syscall.NLMSG_DONE {
break done
}
if m.Header.Type == syscall.NLMSG_ERROR {
error := int32(native.Uint32(m.Data[0:4]))
if error == 0 {
break done
}
return nil, syscall.Errno(-error)
}
if m.Header.Type != syscall.RTM_NEWROUTE {
continue
}
var r Route
msg := (*RtMsg)(unsafe.Pointer(&m.Data[0:syscall.SizeofRtMsg][0]))
if msg.Flags&syscall.RTM_F_CLONED != 0 {
// Ignore cloned routes
continue
}
if msg.Table != syscall.RT_TABLE_MAIN {
// Ignore non-main tables
continue
}
if msg.Family != syscall.AF_INET {
// Ignore non-ipv4 routes
continue
}
if msg.Dst_len == 0 {
// Default routes
r.Default = true
}
attrs, err := syscall.ParseNetlinkRouteAttr(&m)
if err != nil {
return nil, err
}
for _, attr := range attrs {
switch attr.Attr.Type {
case syscall.RTA_DST:
ip := attr.Value
r.IPNet = &net.IPNet{
IP: ip,
Mask: net.CIDRMask(int(msg.Dst_len), 8*len(ip)),
}
case syscall.RTA_OIF:
index := int(native.Uint32(attr.Value[0:4]))
r.Iface, _ = net.InterfaceByIndex(index)
}
}
if r.Default || r.IPNet != nil {
res = append(res, r)
}
}
}
return res, nil
}