1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//go:build linux
// +build linux
package nfqueue_test
import (
"context"
"fmt"
"time"
nfqueue "github.com/florianl/go-nfqueue/v2"
"github.com/mdlayher/netlink"
)
func ExampleNfqueue_RegisterWithErrorFunc() {
// Send outgoing pings to nfqueue queue 100
// # sudo iptables -I OUTPUT -p icmp -j NFQUEUE --queue-num 100
// Set configuration options for nfqueue
config := nfqueue.Config{
NfQueue: 100,
MaxPacketLen: 0xFFFF,
MaxQueueLen: 0xFF,
Copymode: nfqueue.NfQnlCopyPacket,
WriteTimeout: 15 * time.Millisecond,
}
nf, err := nfqueue.Open(&config)
if err != nil {
fmt.Println("could not open nfqueue socket:", err)
return
}
defer nf.Close()
// Avoid receiving ENOBUFS errors.
if err := nf.SetOption(netlink.NoENOBUFS, true); err != nil {
fmt.Printf("failed to set netlink option %v: %v\n",
netlink.NoENOBUFS, err)
return
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
fn := func(a nfqueue.Attribute) int {
id := *a.PacketID
// Just print out the id and payload of the nfqueue packet
fmt.Printf("[%d]\t%v\n", id, *a.Payload)
nf.SetVerdict(id, nfqueue.NfAccept)
return 0
}
// Register your function to listen on nflqueue queue 100
err = nf.RegisterWithErrorFunc(ctx, fn, func(e error) int {
fmt.Println(err)
return -1
})
if err != nil {
fmt.Println(err)
return
}
// Block till the context expires
<-ctx.Done()
}
|
