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session.go
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/
session.go
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package session
import (
"fmt"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"golang.org/x/xerrors"
)
type Key [2]uint64
func (k *Key) String() string {
return fmt.Sprintf("%d:%d", k[0], k[1])
}
type Session struct {
Key Key
LastActive time.Time
Packets []gopacket.Packet
Closed bool
}
func getKey(packet gopacket.Packet) (Key, error) {
net := packet.NetworkLayer()
if net == nil {
return Key{}, xerrors.Errorf(": %w", xerrors.New("packet is not on the Network Layer"))
}
tcp, isTCP := packet.Layer(layers.LayerTypeTCP).(*layers.TCP)
if !isTCP {
return Key{}, xerrors.Errorf(": %w", xerrors.New("packet is not a TCP"))
}
netflow := net.NetworkFlow()
tcpflow := tcp.TransportFlow()
return Key{
netflow.FastHash(),
tcpflow.FastHash(),
}, nil
}