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https://github.com/tailscale/tailscale.git
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530aaa52f1
We weren't correctly retrying truncated requests to an upstream DNS server with TCP. Instead, we'd return a truncated request to the user, even if the user was querying us over TCP and thus able to handle a large response. Also, add an envknob and controlknob to allow users/us to disable this behaviour if it turns out to be buggy (✨ DNS ✨). Updates #9264 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ifb04b563839a9614c0ba03e9c564e8924c1a2bfd
122 lines
4.3 KiB
Go
122 lines
4.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package sockstats collects statistics about network sockets used by
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// the Tailscale client. The context where sockets are used must be
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// instrumented with the WithSockStats() function.
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//
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// Only available on POSIX platforms when built with Tailscale's fork of Go.
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package sockstats
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import (
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"context"
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"tailscale.com/net/netmon"
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"tailscale.com/types/logger"
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)
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// SockStats contains statistics for sockets instrumented with the
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// WithSockStats() function
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type SockStats struct {
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Stats map[Label]SockStat
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CurrentInterfaceCellular bool
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}
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// SockStat contains the sent and received bytes for a socket instrumented with
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// the WithSockStats() function.
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type SockStat struct {
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TxBytes uint64
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RxBytes uint64
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}
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// Label is an identifier for a socket that stats are collected for. A finite
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// set of values that may be used to label a socket to encourage grouping and
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// to make storage more efficient.
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type Label uint8
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//go:generate go run golang.org/x/tools/cmd/stringer -type Label -trimprefix Label
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// Labels are named after the package and function/struct that uses the socket.
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// Values may be persisted and thus existing entries should not be re-numbered.
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const (
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LabelControlClientAuto Label = 0 // control/controlclient/auto.go
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LabelControlClientDialer Label = 1 // control/controlhttp/client.go
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LabelDERPHTTPClient Label = 2 // derp/derphttp/derphttp_client.go
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LabelLogtailLogger Label = 3 // logtail/logtail.go
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LabelDNSForwarderDoH Label = 4 // net/dns/resolver/forwarder.go
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LabelDNSForwarderUDP Label = 5 // net/dns/resolver/forwarder.go
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LabelNetcheckClient Label = 6 // net/netcheck/netcheck.go
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LabelPortmapperClient Label = 7 // net/portmapper/portmapper.go
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LabelMagicsockConnUDP4 Label = 8 // wgengine/magicsock/magicsock.go
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LabelMagicsockConnUDP6 Label = 9 // wgengine/magicsock/magicsock.go
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LabelNetlogLogger Label = 10 // wgengine/netlog/logger.go
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LabelSockstatlogLogger Label = 11 // log/sockstatlog/logger.go
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LabelDNSForwarderTCP Label = 12 // net/dns/resolver/forwarder.go
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)
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// WithSockStats instruments a context so that sockets created with it will
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// have their statistics collected.
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func WithSockStats(ctx context.Context, label Label, logf logger.Logf) context.Context {
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return withSockStats(ctx, label, logf)
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}
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// Get returns the current socket statistics.
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func Get() *SockStats {
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return get()
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}
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// InterfaceSockStats contains statistics for sockets instrumented with the
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// WithSockStats() function, broken down by interface. The statistics may be a
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// subset of the total if interfaces were added after the instrumented socket
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// was created.
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type InterfaceSockStats struct {
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Stats map[Label]InterfaceSockStat
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Interfaces []string
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}
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// InterfaceSockStat contains the per-interface sent and received bytes for a
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// socket instrumented with the WithSockStats() function.
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type InterfaceSockStat struct {
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TxBytesByInterface map[string]uint64
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RxBytesByInterface map[string]uint64
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}
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// GetWithInterfaces is a variant of Get that returns the current socket
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// statistics broken down by interface. It is slightly more expensive than Get.
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func GetInterfaces() *InterfaceSockStats {
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return getInterfaces()
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}
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// ValidationSockStats contains external validation numbers for sockets
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// instrumented with WithSockStats. It may be a subset of the all sockets,
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// depending on what externa measurement mechanisms the platform supports.
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type ValidationSockStats struct {
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Stats map[Label]ValidationSockStat
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}
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// ValidationSockStat contains the validation bytes for a socket instrumented
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// with WithSockStats.
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type ValidationSockStat struct {
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TxBytes uint64
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RxBytes uint64
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}
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// GetValidation is a variant of Get that returns external validation numbers
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// for stats. It is more expensive than Get and should be used in debug
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// interfaces only.
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func GetValidation() *ValidationSockStats {
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return getValidation()
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}
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// SetNetMon configures the sockstats package to monitor the active
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// interface, so that per-interface stats can be collected.
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func SetNetMon(netMon *netmon.Monitor) {
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setNetMon(netMon)
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}
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// DebugInfo returns a string containing debug information about the tracked
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// statistics.
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func DebugInfo() string {
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return debugInfo()
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}
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