Update dependencies

vendor/tailscale.com/portlist/portlist.go

@@ -0,0 +1,80 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+// This file is just the types. The bulk of the code is in poller.go.
+
+// The portlist package contains code that checks what ports are open and
+// listening on the current machine.
+package portlist
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// Port is a listening port on the machine.
+type Port struct {
+	Proto   string // "tcp" or "udp"
+	Port    uint16 // port number
+	Process string // optional process name, if found (requires suitable permissions)
+	Pid     int    // process ID, if known (requires suitable permissions)
+}
+
+// List is a list of Ports.
+type List []Port
+
+func (a *Port) lessThan(b *Port) bool {
+	if a.Port != b.Port {
+		return a.Port < b.Port
+	}
+	if a.Proto != b.Proto {
+		return a.Proto < b.Proto
+	}
+	return a.Process < b.Process
+}
+
+func (a *Port) equal(b *Port) bool {
+	return a.Port == b.Port &&
+		a.Proto == b.Proto &&
+		a.Process == b.Process
+}
+
+func (a List) equal(b List) bool {
+	if len(a) != len(b) {
+		return false
+	}
+	for i := range a {
+		if !a[i].equal(&b[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+func (pl List) String() string {
+	var sb strings.Builder
+	for _, v := range pl {
+		fmt.Fprintf(&sb, "%-3s %5d %#v\n",
+			v.Proto, v.Port, v.Process)
+	}
+	return strings.TrimRight(sb.String(), "\n")
+}
+
+// sortAndDedup sorts ps in place (by Port.lessThan) and then returns
+// a subset of it with duplicate (Proto, Port) removed.
+func sortAndDedup(ps List) List {
+	sort.Slice(ps, func(i, j int) bool {
+		return (&ps[i]).lessThan(&ps[j])
+	})
+	out := ps[:0]
+	var last Port
+	for _, p := range ps {
+		if last.Proto == p.Proto && last.Port == p.Port {
+			continue
+		}
+		out = append(out, p)
+		last = p
+	}
+	return out
+}