PTah
53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
package scans
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import (
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"encoding/hex"
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"fmt"
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"strconv"
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"strings"
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)
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// NormalizeMAC приводит ввод пользователя к виду aa:bb:cc:dd:ee:ff (как в FDB/ARP).
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func NormalizeMAC(s string) string {
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s = strings.ToLower(strings.TrimSpace(s))
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if s == "" {
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return ""
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}
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s = strings.ReplaceAll(s, "-", ":")
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if strings.Count(s, ":") == 5 {
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parts := strings.Split(s, ":")
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if len(parts) != 6 {
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return ""
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}
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var b [6]byte
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for i, p := range parts {
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n, err := strconv.ParseUint(strings.TrimSpace(p), 16, 8)
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if err != nil {
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return ""
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}
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b[i] = byte(n)
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}
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return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", b[0], b[1], b[2], b[3], b[4], b[5])
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}
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if strings.HasPrefix(s, "0x") {
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h := strings.TrimPrefix(s, "0x")
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h = strings.ReplaceAll(h, ":", "")
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if len(h) != 12 {
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return ""
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}
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raw, err := hex.DecodeString(h)
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if err != nil || len(raw) != 6 {
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return ""
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}
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return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", raw[0], raw[1], raw[2], raw[3], raw[4], raw[5])
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}
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if len(s) == 12 {
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raw, err := hex.DecodeString(s)
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if err != nil || len(raw) != 6 {
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return ""
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}
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return fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", raw[0], raw[1], raw[2], raw[3], raw[4], raw[5])
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}
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return ""
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}
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