Update dependencies

vendor/tailscale.com/net/netmon/netmon_freebsd.go

@@ -0,0 +1,56 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+package netmon
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"strings"
+
+	"tailscale.com/types/logger"
+)
+
+// unspecifiedMessage is a minimal message implementation that should not
+// be ignored. In general, OS-specific implementations should use better
+// types and avoid this if they can.
+type unspecifiedMessage struct{}
+
+func (unspecifiedMessage) ignore() bool { return false }
+
+// devdConn implements osMon using devd(8).
+type devdConn struct {
+	conn net.Conn
+}
+
+func newOSMon(logf logger.Logf, m *Monitor) (osMon, error) {
+	conn, err := net.Dial("unixpacket", "/var/run/devd.seqpacket.pipe")
+	if err != nil {
+		logf("devd dial error: %v, falling back to polling method", err)
+		return newPollingMon(logf, m)
+	}
+	return &devdConn{conn}, nil
+}
+
+func (c *devdConn) IsInterestingInterface(iface string) bool { return true }
+
+func (c *devdConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *devdConn) Receive() (message, error) {
+	for {
+		msg, err := bufio.NewReader(c.conn).ReadString('\n')
+		if err != nil {
+			return nil, fmt.Errorf("reading devd socket: %v", err)
+		}
+		// Only return messages related to the network subsystem.
+		if !strings.Contains(msg, "system=IFNET") {
+			continue
+		}
+		// TODO: this is where the devd-specific message would
+		// get converted into a "standard" event message and returned.
+		return unspecifiedMessage{}, nil
+	}
+}