blob: b26bb47124260b5935fe6a71017a827d1843c2df (
plain)
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
|
package iputil
import (
"fmt"
"math/big"
"net"
"strings"
"time"
)
func LookupAddr(ip net.IP) (string, error) {
names, err := net.LookupAddr(ip.String())
if err != nil || len(names) == 0 {
return "", err
}
// Always return unrooted name
return strings.TrimRight(names[0], "."), nil
}
func LookupPort(ip net.IP, port uint64) error {
address := fmt.Sprintf("[%s]:%d", ip, port)
conn, err := net.DialTimeout("tcp", address, 2*time.Second)
if err != nil {
return err
}
defer conn.Close()
return nil
}
func ToDecimal(ip net.IP) *big.Int {
i := big.NewInt(0)
if to4 := ip.To4(); to4 != nil {
i.SetBytes(to4)
} else {
i.SetBytes(ip)
}
return i
}
|
