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util.go
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/
util.go
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package reassembler
import (
"encoding/binary"
"math/big"
"github.com/google/gopacket/layers"
)
func generateKeyIPV4(tcp *layers.TCP, ip *layers.IPv4) string {
IPv4Src := big.NewInt(0)
IPv4Src.SetBytes(ip.SrcIP.To4())
IPv4Dst := big.NewInt(0)
IPv4Dst.SetBytes(ip.DstIP.To4())
spI := big.NewInt(0)
spB := make([]byte, 2)
binary.BigEndian.PutUint16(spB, uint16(tcp.SrcPort))
spI.SetBytes(spB)
dpI := big.NewInt(0)
dpB := make([]byte, 2)
binary.BigEndian.PutUint16(dpB, uint16(tcp.DstPort))
dpI.SetBytes(dpB)
x := IPv4Src.Add(IPv4Src, IPv4Dst)
y := dpI.Add(dpI, spI)
return x.Add(x, y).String()
}
func generateKeyIPV6(tcp *layers.TCP, ip *layers.IPv6) string {
IPv6Src := big.NewInt(0)
IPv6Src.SetBytes(ip.SrcIP.To16())
IPv6IDst := big.NewInt(0)
IPv6IDst.SetBytes(ip.DstIP.To16())
spI := big.NewInt(0)
spB := make([]byte, 2)
binary.BigEndian.PutUint16(spB, uint16(tcp.SrcPort))
spI.SetBytes(spB)
dpI := big.NewInt(0)
dpB := make([]byte, 2)
binary.BigEndian.PutUint16(dpB, uint16(tcp.DstPort))
dpI.SetBytes(dpB)
x := IPv6Src.Add(IPv6Src, IPv6IDst)
y := dpI.Add(dpI, spI)
return x.Add(x, y).String()
}