Revisioni di onelisten.go

1 file changed, 3 insertions, 1 deletion

onelisten.go

			@@ -8,6 +8,7 @@ import (
8	8		"time"
9	9		)
10	10
	11	+	// Filter for syn packets
11	12		const filter = "(tcp[tcpflags] & tcp-syn != 0)"
12	13
13	14		func handlePacket(handle *pcap.Handle, packet gopacket.Packet) {
			@@ -16,6 +17,7 @@ func handlePacket(handle *pcap.Handle, packet gopacket.Packet) {
16	17		tcp := packet.TransportLayer().(*layers.TCP)
17	18		fmt.Printf("[%s] SYN packet received from %s on port %d. Replying with SYN+ACK...\n", time.Now().String(), ipv4.SrcIP, tcp.DstPort)
18	19
	20	+	// Build syn+ack response
19	21		buf := gopacket.NewSerializeBuffer()
20	22		err := gopacket.SerializeLayers(buf, gopacket.SerializeOptions{},
21	23		&layers.Ethernet{
			@@ -44,7 +46,7 @@ func handlePacket(handle *pcap.Handle, packet gopacket.Packet) {
44	46		}
45	47
46	48		func main() {
47		-	handle, err := pcap.OpenLive("eth0", 1600, true, pcap.BlockForever)
	49	+	handle, err := pcap.OpenLive("eth0", 1600, true, pcap.BlockForever) // Change eth0 for your device
48	50		if err != nil {
49	51		panic(err)
50	52		}

Nessuna modifica

Nessuna modifica

1 file changed, 56 insertions

onelisten.go(file creato)

		@@ -0,0 +1,56 @@
1	+	package main
2	+
3	+	import (
4	+	"fmt"
5	+	"github.com/google/gopacket"
6	+	"github.com/google/gopacket/layers"
7	+	"github.com/google/gopacket/pcap"
8	+	"time"
9	+	)
10	+
11	+	const filter = "(tcp[tcpflags] & tcp-syn != 0)"
12	+
13	+	func handlePacket(handle *pcap.Handle, packet gopacket.Packet) {
14	+	eth := packet.LinkLayer().(*layers.Ethernet)
15	+	ipv4 := packet.NetworkLayer().(*layers.IPv4)
16	+	tcp := packet.TransportLayer().(*layers.TCP)
17	+	fmt.Printf("[%s] SYN packet received from %s on port %d. Replying with SYN+ACK...\n", time.Now().String(), ipv4.SrcIP, tcp.DstPort)
18	+
19	+	buf := gopacket.NewSerializeBuffer()
20	+	err := gopacket.SerializeLayers(buf, gopacket.SerializeOptions{},
21	+	&layers.Ethernet{
22	+	DstMAC: eth.SrcMAC,
23	+	SrcMAC: eth.DstMAC,
24	+	},
25	+	&layers.IPv4{
26	+	SrcIP: ipv4.DstIP,
27	+	DstIP: ipv4.SrcIP,
28	+	},
29	+	&layers.TCP{
30	+	SrcPort: tcp.DstPort,
31	+	DstPort: tcp.SrcPort,
32	+	Seq: tcp.Ack,
33	+	Ack: tcp.Seq + 1,
34	+	SYN: true,
35	+	ACK: true,
36	+	})
37	+	if err != nil {
38	+	panic(err)
39	+	}
40	+	err = handle.WritePacketData(buf.Bytes())
41	+	if err != nil {
42	+	panic(err)
43	+	}
44	+	}
45	+
46	+	func main() {
47	+	handle, err := pcap.OpenLive("eth0", 1600, true, pcap.BlockForever)
48	+	if err != nil {
49	+	panic(err)
50	+	}
51	+	_ = handle.SetBPFFilter(filter)
52	+	packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
53	+	for packet := range packetSource.Packets() {
54	+	handlePacket(handle, packet)
55	+	}
56	+	}

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