-
Notifications
You must be signed in to change notification settings - Fork 0
/
bpf_validate.go
46 lines (43 loc) · 1.04 KB
/
bpf_validate.go
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
package main
import (
"os"
"fmt"
"strings"
"encoding/json"
"github.com/google/gopacket/pcap"
"github.com/google/gopacket/layers"
)
// Determine if a given string is a valid BPF expression
func validate(f string)(bool, error) {
_, err := pcap.NewBPF(layers.LinkTypeEthernet, 1500, f)
if err != nil {
return false, err
}
return true, err
}
func main(){
if len(os.Args) >= 2 {
f := strings.Join(os.Args[1:], " ")
valid, err := validate(f)
msg := ""
if err != nil {
msg = err.Error()
}
res := map[string]interface{}{"msg":msg,"success":valid}
data, err := json.Marshal(res)
if err != nil {
fmt.Println("An error occured: %v", err)
os.Exit(1)
}
fmt.Println(string(data))
switch valid {
case true:
os.Exit(0)
case false:
os.Exit(1)
}
} else {
fmt.Println("Incorrect number of arguments. Try again.")
os.Exit(1)
}
}