log packet information
This commit is contained in:
parent
ce4c21154b
commit
3983700788
8
main.go
8
main.go
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@ -42,13 +42,17 @@ func run(opt options) error {
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buf := [4096]byte{}
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var s tlv.PacketDecoder
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for {
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b, src, ifindex, err := conn.ReadFrom(buf[:])
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b, src, rcm, err := conn.ReadFrom(buf[:])
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if err != nil {
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fmt.Println("Skipping packet:", err)
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continue
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}
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s.Reset(b, src, ifindex)
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fmt.Print("\x1B[1m")
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fmt.Printf("Packet size %4d %s", len(b), rcm)
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fmt.Println("\x1B[0m")
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s.Reset(b, src, rcm.IfIndex)
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for s.Scan() {
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switch t := s.TLV().(type) {
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case tlv.NextHop:
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@ -48,15 +48,16 @@ func (c Conn) JoinGroup(ifname string, addr string) error {
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return c.v6pc.JoinGroup(ifi, &net.UDPAddr{IP: ip.IPAddr().IP})
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}
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func (c Conn) ReadFrom(b []byte) (body []byte, src netaddr.IP, ifindex int, err error) {
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n, rcm, _, err := c.v6pc.ReadFrom(b)
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func (c Conn) ReadFrom(b []byte) (body []byte, src netaddr.IP, rcm *ipv6.ControlMessage, err error) {
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var n int
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n, rcm, _, err = c.v6pc.ReadFrom(b)
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if err != nil {
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return nil, netaddr.IP{}, 0, err
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return nil, netaddr.IP{}, nil, err
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}
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b = b[:n]
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if len(b) < BabelPacketHeaderSize {
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return nil, netaddr.IP{}, 0, fmt.Errorf("Packet too short: %d", len(b))
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return nil, netaddr.IP{}, nil, fmt.Errorf("Packet too short: %d", len(b))
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}
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magic := b[0]
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@ -65,22 +66,22 @@ func (c Conn) ReadFrom(b []byte) (body []byte, src netaddr.IP, ifindex int, err
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b = b[4:]
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if magic != BabelMagic {
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return nil, netaddr.IP{}, 0, fmt.Errorf("Invalid magic number %d", magic)
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return nil, netaddr.IP{}, nil, fmt.Errorf("Invalid magic number %d", magic)
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}
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if version != BabelVersion {
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return nil, netaddr.IP{}, 0, fmt.Errorf("Unsupported version number %d", version)
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return nil, netaddr.IP{}, nil, fmt.Errorf("Unsupported version number %d", version)
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}
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if int(length) > len(b) {
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return nil, netaddr.IP{}, 0, fmt.Errorf("Invalid length for packet of size %d: %d", n, length)
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return nil, netaddr.IP{}, nil, fmt.Errorf("Invalid length for packet of size %d: %d", n, length)
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}
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var ok bool
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src, ok = netaddr.FromStdIPRaw(rcm.Src)
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if !ok {
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return nil, netaddr.IP{}, 0, fmt.Errorf("Invalid src address %q", rcm.Src)
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return nil, netaddr.IP{}, nil, fmt.Errorf("Invalid src address %q", rcm.Src)
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}
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return b, src, rcm.IfIndex, err
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return b, src, rcm, err
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}
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