tailscale/wgengine/monitor/monitor_freebsd.go

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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package monitor
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 *Mon) (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
}
}