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55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package monitor
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import (
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"bufio"
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"fmt"
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"net"
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"strings"
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"tailscale.com/types/logger"
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)
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// unspecifiedMessage is a minimal message implementation that should not
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// be ignored. In general, OS-specific implementations should use better
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// types and avoid this if they can.
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type unspecifiedMessage struct{}
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func (unspecifiedMessage) ignore() bool { return false }
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// devdConn implements osMon using devd(8).
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type devdConn struct {
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conn net.Conn
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}
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func newOSMon(logf logger.Logf) (osMon, error) {
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conn, err := net.Dial("unixpacket", "/var/run/devd.seqpacket.pipe")
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if err != nil {
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return nil, fmt.Errorf("devd dial error: %v", err)
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}
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return &devdConn{conn}, nil
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}
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func (c *devdConn) Close() error {
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return c.conn.Close()
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}
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func (c *devdConn) Receive() (message, error) {
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for {
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msg, err := bufio.NewReader(c.conn).ReadString('\n')
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if err != nil {
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return nil, fmt.Errorf("reading devd socket: %v", err)
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}
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// Only return messages related to the network subsystem.
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if !strings.Contains(msg, "system=IFNET") {
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continue
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}
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// TODO: this is where the devd-specific message would
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// get converted into a "standard" event message and returned.
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return unspecifiedMessage{}, nil
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}
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}
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