mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
d5baeeed5c
Rewrite log lines on the fly, based on the set of known peers. This enables us to use upstream wireguard-go logging, but maintain the Tailscale-style peer public key identifiers that the rest of our systems (and people) expect. Fixes #1183 Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// 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 wglog contains logging helpers for wireguard-go.
|
|
package wglog
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"fmt"
|
|
"strings"
|
|
"sync/atomic"
|
|
|
|
"github.com/tailscale/wireguard-go/device"
|
|
"github.com/tailscale/wireguard-go/wgcfg"
|
|
"tailscale.com/types/logger"
|
|
)
|
|
|
|
// A Logger is a wireguard-go log wrapper that cleans up and rewrites log lines.
|
|
// It can be modified at run time to adjust to new wireguard-go configurations.
|
|
type Logger struct {
|
|
DeviceLogger *device.Logger
|
|
replacer atomic.Value // of *strings.Replacer
|
|
}
|
|
|
|
// NewLogger creates a new logger for use with wireguard-go.
|
|
// This logger silences repetitive/unhelpful noisy log lines
|
|
// and rewrites peer keys from wireguard-go into Tailscale format.
|
|
func NewLogger(logf logger.Logf) *Logger {
|
|
ret := new(Logger)
|
|
|
|
wrapper := func(format string, args ...interface{}) {
|
|
msg := fmt.Sprintf(format, args...)
|
|
if strings.Contains(msg, "Routine:") {
|
|
// wireguard-go logs as it starts and stops routines.
|
|
// Drop those; there are a lot of them, and they're just noise.
|
|
return
|
|
}
|
|
r := ret.replacer.Load()
|
|
if r == nil {
|
|
// No replacements specified; log as originally planned.
|
|
logf(format, args...)
|
|
return
|
|
}
|
|
// Do the replacements.
|
|
new := r.(*strings.Replacer).Replace(msg)
|
|
if new == msg {
|
|
// No replacements. Log as originally planned.
|
|
logf(format, args...)
|
|
return
|
|
}
|
|
// We made some replacements. Log the new version.
|
|
// This changes the format string,
|
|
// which is somewhat unfortunate as it impacts rate limiting,
|
|
// but there's not much we can do about that.
|
|
logf("%s", new)
|
|
}
|
|
std := logger.StdLogger(wrapper)
|
|
ret.DeviceLogger = &device.Logger{
|
|
Debug: std,
|
|
Info: std,
|
|
Error: std,
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// SetPeers adjusts x to rewrite the peer public keys found in peers.
|
|
// SetPeers is safe for concurrent use.
|
|
func (x *Logger) SetPeers(peers []wgcfg.Peer) {
|
|
// Construct a new peer public key log rewriter.
|
|
var replace []string
|
|
for _, peer := range peers {
|
|
old := "peer(" + wireguardGoString(peer.PublicKey) + ")"
|
|
new := peer.PublicKey.ShortString()
|
|
replace = append(replace, old, new)
|
|
}
|
|
r := strings.NewReplacer(replace...)
|
|
x.replacer.Store(r)
|
|
}
|
|
|
|
// wireguardGoString prints p in the same format used by wireguard-go.
|
|
func wireguardGoString(k wgcfg.Key) string {
|
|
base64Key := base64.StdEncoding.EncodeToString(k[:])
|
|
abbreviatedKey := "invalid"
|
|
if len(base64Key) == 44 {
|
|
abbreviatedKey = base64Key[0:4] + "…" + base64Key[39:43]
|
|
}
|
|
return abbreviatedKey
|
|
}
|