mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 15:35:38 +00:00
36 lines
723 B
Go
36 lines
723 B
Go
|
// Copyright (c) Tailscale Inc & AUTHORS
|
||
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
||
|
|
|
||
|
|
package linuxfw
|
||
|
|
|
||
|
|
import (
|
||
|
|
"encoding/hex"
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
"unicode"
|
||
|
|
)
|
||
|
|
|
||
|
|
func formatMaybePrintable(b []byte) string {
|
||
|
|
// Remove a single trailing null, if any
|
||
|
|
if len(b) > 0 && b[len(b)-1] == 0 {
|
||
|
|
b = b[:len(b)-1]
|
||
|
|
}
|
||
|
|
|
||
|
|
nonprintable := strings.IndexFunc(string(b), func(r rune) bool {
|
||
|
|
return r > unicode.MaxASCII || !unicode.IsPrint(r)
|
||
|
|
})
|
||
|
|
if nonprintable >= 0 {
|
||
|
|
return "<hex>" + hex.EncodeToString(b)
|
||
|
|
}
|
||
|
|
return string(b)
|
||
|
|
}
|
||
|
|
|
||
|
|
func formatPortRange(r [2]uint16) string {
|
||
|
|
if r == [2]uint16{0, 65535} {
|
||
|
|
return fmt.Sprintf(`any`)
|
||
|
|
} else if r[0] == r[1] {
|
||
|
|
return fmt.Sprintf(`%d`, r[0])
|
||
|
|
}
|
||
|
|
return fmt.Sprintf(`%d-%d`, r[0], r[1])
|
||
|
|
}
|