mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-04 23:45:34 +00:00
cec779e771
And update a few callers as examples of motivation. (there are a couple others, but these are the ones where it's prettier) Updates #cleanup Change-Id: Ic8c5cb7af0a59c6e790a599136b591ebe16d38eb Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
40 lines
766 B
Go
40 lines
766 B
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
//go:build linux
|
|
|
|
package linuxfw
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"fmt"
|
|
"strings"
|
|
"unicode"
|
|
|
|
"tailscale.com/util/slicesx"
|
|
)
|
|
|
|
func formatMaybePrintable(b []byte) string {
|
|
// Remove a single trailing null, if any.
|
|
if slicesx.LastEqual(b, 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])
|
|
}
|