func (p *Packet) SetPayload(pl packet.Packet) error {
p.pkt_payload = pl
p.Protocol = TypeToProtocol(pl.GetType())
p.Length = p.GetLength()
pl.InitChecksum(p.pseudo_checksum())
return nil
}
func (p *Packet) SetPayload(pl packet.Packet) error {
p.pkt_payload = pl
p.Type = TypeToEtherType(pl.GetType())
if p.Type < 0x0600 {
p.Length = p.GetLength()
}
return nil
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.ICMPv6 {
return false
}
if other.(*Packet).Type == EchoRequest && p.Type == EchoReply {
return true
}
return false
}
// Return the first layer of the given type in the packet. If no suitable layer
// is found, return nil.
func FindLayer(p packet.Packet, layer packet.Type) packet.Packet {
switch {
case p == nil:
return nil
case p.GetType() == layer:
return p
default:
return FindLayer(p.Payload(), layer)
}
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.TCP {
return false
}
if p.SrcPort != other.(*Packet).DstPort ||
p.DstPort != other.(*Packet).SrcPort {
return false
}
return true
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.ARP {
return false
}
if p.Operation == Reply && other.(*Packet).Operation == Request &&
p.ProtoSrcAddr.Equal(other.(*Packet).ProtoDstAddr) {
return true
}
return false
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.ICMPv4 {
return false
}
if (other.(*Packet).Type == EchoRequest && p.Type == EchoReply) ||
(other.(*Packet).Type == Timestamp && p.Type == TimestampReply) ||
(other.(*Packet).Type == InfoRequest && p.Type == InfoReply) ||
(other.(*Packet).Type == AddrMaskRequest && p.Type == AddrMaskReply) {
return (other.(*Packet).Seq == p.Seq) &&
(other.(*Packet).Id == p.Id)
}
return false
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.Eth {
return false
}
if p.Type != other.(*Packet).Type {
return false
}
if p.Payload() != nil {
return p.Payload().Answers(other.Payload())
}
return true
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil {
return false
}
if other.GetType() == packet.VLAN &&
p.VLAN != other.(*Packet).VLAN {
return false
}
if p.Payload() != nil {
return p.Payload().Answers(other.Payload())
}
return true
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.IPv6 {
return false
}
/* TODO: check link-local broadcast addresses */
if !p.DstAddr.Equal(other.(*Packet).SrcAddr) {
return false
}
/* TODO: check ICMPv6 errors */
if p.Payload() != nil {
return p.Payload().Answers(other.Payload())
}
return true
}
func (p *Packet) Answers(other packet.Packet) bool {
if other == nil || other.GetType() != packet.IPv4 {
return false
}
if p.Payload() != nil &&
p.Payload().GetType() == packet.ICMPv4 &&
p.Payload().Payload() != nil {
return p.Payload().Payload().Equals(other)
}
if !p.SrcAddr.Equal(other.(*Packet).DstAddr) ||
p.Protocol != other.(*Packet).Protocol {
return false
}
if p.Payload() != nil {
return p.Payload().Answers(other.Payload())
}
return true
}
func (p *Packet) SetPayload(pl packet.Packet) error {
p.pkt_payload = pl
p.Type = eth.TypeToEtherType(pl.GetType())
return nil
}
// Recursively unpack the given byte slice into a packet. The link_type argument
// must specify the type of the first layer in the input data, successive layers
// will be detected automatically.
//
// Note that unpacking is done without copying the input slice, which means that
// if the slice is modifed, it may affect the packets that where unpacked from
// it. If you can't guarantee that the data slice won't change, you'll need to
// copy it and pass the copy to UnpackAll().
func UnpackAll(buf []byte, link_type packet.Type) (packet.Packet, error) {
var b packet.Buffer
b.Init(buf)
first_pkt := packet.Packet(nil)
prev_pkt := packet.Packet(nil)
for link_type != packet.None {
var p packet.Packet
if b.Len() <= 0 {
break
}
switch link_type {
case packet.ARP:
p = &arp.Packet{}
case packet.Eth:
p = ð.Packet{}
case packet.ICMPv4:
p = &icmpv4.Packet{}
case packet.ICMPv6:
p = &icmpv6.Packet{}
case packet.IPv4:
p = &ipv4.Packet{}
case packet.IPv6:
p = &ipv6.Packet{}
case packet.LLC:
p = &llc.Packet{}
case packet.RadioTap:
p = &radiotap.Packet{}
case packet.SLL:
p = &sll.Packet{}
case packet.SNAP:
p = &snap.Packet{}
case packet.TCP:
p = &tcp.Packet{}
case packet.UDP:
p = &udp.Packet{}
case packet.VLAN:
p = &vlan.Packet{}
default:
p = &raw.Packet{}
}
if p == nil {
break
}
b.NewLayer()
err := p.Unpack(&b)
if err != nil {
return nil, err
}
if prev_pkt != nil {
prev_pkt.SetPayload(p)
} else {
first_pkt = p
}
prev_pkt = p
link_type = p.GuessPayloadType()
}
return first_pkt, nil
}