59 lines
982 B
Go
59 lines
982 B
Go
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package main
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import (
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"encoding/binary"
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"net"
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)
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type Protocol uint8
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const (
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ProtocolTCP Protocol = iota
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ProtocolUDP
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)
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type Packet struct {
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SourceIP net.IP
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DestIP net.IP
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SourcePort uint16
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DestPort uint16
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Transport Protocol
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}
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type observedPacket struct {
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SourceIP uint32
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DestIP uint32
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SourcePort uint16
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DestPort uint16
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Transport Protocol
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}
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func (p *observedPacket) ToPacket() *Packet {
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return &Packet{
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SourceIP: int2ip(p.SourceIP),
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DestIP: int2ip(p.DestIP),
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SourcePort: p.SourcePort,
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DestPort: p.DestPort,
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Transport: p.Transport,
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}
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}
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func int2ip(nn uint32) net.IP {
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ip := make(net.IP, net.IPv4len)
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binary.LittleEndian.PutUint32(ip, nn)
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return ip
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}
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func ip2int(ip net.IP) uint32 {
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b := make([]byte, net.IPv4len)
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copy(b, ip.To4())
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reverse(b)
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return binary.BigEndian.Uint32(b)
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}
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func reverse(input []byte) {
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for i := 0; i < len(input)/2; i++ {
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input[i], input[len(input)-1-i] = input[len(input)-1-i], input[i]
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}
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}
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