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packet.go
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packet.go
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package tcp
import (
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
)
// 发送ACK
func (conn *Connection)sendAck() {
ethLayer, ipLayer := conn.getUpperLayers()
// tcp
tcpLayer := layers.TCP{
SrcPort: conn.srcPort,
DstPort: conn.dstPort,
ACK: true,
Ack: conn.dstSeq,
Seq: conn.srcSeq,
Window: 0xFFFF,
}
tcpLayer.SetNetworkLayerForChecksum(ipLayer)
buf := gopacket.NewSerializeBuffer()
conn.writeRaw(buf, ethLayer, ipLayer, &tcpLayer)
}
// 发送SYN
func (conn *Connection)sendSYN() {
ethLayer, ipLayer := conn.getUpperLayers()
// tcp
tcpLayer := layers.TCP{
SrcPort: conn.srcPort,
DstPort: conn.dstPort,
SYN: true,
ACK: true,
Ack: conn.dstSeq + 1,
Window: 0xFFFF,
Options: []layers.TCPOption{{layers.TCPOptionKindMSS,4,[]byte{5,189}}},
}
tcpLayer.SetNetworkLayerForChecksum(ipLayer)
buf := gopacket.NewSerializeBuffer()
conn.writeRaw(buf, ethLayer, ipLayer, &tcpLayer)
}
// 发送FIN
func (conn *Connection)sendFin() {
ethLayer, ipLayer := conn.getUpperLayers()
// tcp
tcpLayer := layers.TCP{
SrcPort: conn.srcPort,
DstPort: conn.dstPort,
ACK: true,
FIN: true,
Ack: conn.dstSeq,
Seq: conn.srcSeq,
Window: 0xFFFF,
}
tcpLayer.SetNetworkLayerForChecksum(ipLayer)
buf := gopacket.NewSerializeBuffer()
conn.writeRaw(buf, ethLayer, ipLayer, &tcpLayer)
}