// 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.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
}
