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server.go
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// Copyright 2018 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proxy
import (
"fmt"
"io"
mrand "math/rand"
"net"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/coreos/etcd/pkg/transport"
humanize "github.com/dustin/go-humanize"
"go.uber.org/zap"
)
// Server defines proxy server layer that simulates common network faults,
// such as latency spikes, packet drop/corruption, etc..
type Server interface {
// From returns proxy source address in "scheme://host:port" format.
From() string
// To returns proxy destination address in "scheme://host:port" format.
To() string
// Ready returns when proxy is ready to serve.
Ready() <-chan struct{}
// Done returns when proxy has been closed.
Done() <-chan struct{}
// Error sends errors while serving proxy.
Error() <-chan error
// Close closes listener and transport.
Close() error
// DelayAccept adds latency ± random variable to accepting new incoming connections.
DelayAccept(latency, rv time.Duration)
// UndelayAccept removes sending latencies.
UndelayAccept()
// LatencyAccept returns current latency on accepting new incoming connections.
LatencyAccept() time.Duration
// DelayTx adds latency ± random variable to "sending" layer.
DelayTx(latency, rv time.Duration)
// UndelayTx removes sending latencies.
UndelayTx()
// LatencyTx returns current send latency.
LatencyTx() time.Duration
// DelayRx adds latency ± random variable to "receiving" layer.
DelayRx(latency, rv time.Duration)
// UndelayRx removes "receiving" latencies.
UndelayRx()
// LatencyRx returns current receive latency.
LatencyRx() time.Duration
// PauseAccept stops accepting new connections.
PauseAccept()
// UnpauseAccept removes pause operation on accepting new connections.
UnpauseAccept()
// PauseTx stops "forwarding" packets.
PauseTx()
// UnpauseTx removes "forwarding" pause operation.
UnpauseTx()
// PauseRx stops "receiving" packets to client.
PauseRx()
// UnpauseRx removes "receiving" pause operation.
UnpauseRx()
// BlackholeTx drops all incoming packets before "forwarding".
BlackholeTx()
// UnblackholeTx removes blackhole operation on "sending".
UnblackholeTx()
// BlackholeRx drops all incoming packets to client.
BlackholeRx()
// UnblackholeRx removes blackhole operation on "receiving".
UnblackholeRx()
// CorruptTx corrupts incoming packets from the listener.
CorruptTx(f func(data []byte) []byte)
// UncorruptTx removes corrupt operation on "forwarding".
UncorruptTx()
// CorruptRx corrupts incoming packets to client.
CorruptRx(f func(data []byte) []byte)
// UncorruptRx removes corrupt operation on "receiving".
UncorruptRx()
// ResetListener closes and restarts listener.
ResetListener() error
}
type proxyServer struct {
lg *zap.Logger
from, to url.URL
tlsInfo transport.TLSInfo
dialTimeout time.Duration
bufferSize int
retryInterval time.Duration
readyc chan struct{}
donec chan struct{}
errc chan error
closeOnce sync.Once
closeWg sync.WaitGroup
listenerMu sync.RWMutex
listener net.Listener
latencyAcceptMu sync.RWMutex
latencyAccept time.Duration
latencyTxMu sync.RWMutex
latencyTx time.Duration
latencyRxMu sync.RWMutex
latencyRx time.Duration
corruptTxMu sync.RWMutex
corruptTx func(data []byte) []byte
corruptRxMu sync.RWMutex
corruptRx func(data []byte) []byte
acceptMu sync.Mutex
pauseAcceptc chan struct{}
txMu sync.Mutex
pauseTxc chan struct{}
blackholeTxc chan struct{}
rxMu sync.Mutex
pauseRxc chan struct{}
blackholeRxc chan struct{}
}
// ServerConfig defines proxy server configuration.
type ServerConfig struct {
Logger *zap.Logger
From url.URL
To url.URL
TLSInfo transport.TLSInfo
DialTimeout time.Duration
BufferSize int
RetryInterval time.Duration
}
var (
defaultDialTimeout = 3 * time.Second
defaultBufferSize = 48 * 1024
defaultRetryInterval = 10 * time.Millisecond
defaultLogger *zap.Logger
)
func init() {
var err error
defaultLogger, err = zap.NewProduction()
if err != nil {
panic(err)
}
}
// NewServer returns a proxy implementation with no iptables/tc dependencies.
// The proxy layer overhead is <1ms.
func NewServer(cfg ServerConfig) Server {
p := &proxyServer{
lg: cfg.Logger,
from: cfg.From,
to: cfg.To,
tlsInfo: cfg.TLSInfo,
dialTimeout: cfg.DialTimeout,
bufferSize: cfg.BufferSize,
retryInterval: cfg.RetryInterval,
readyc: make(chan struct{}),
donec: make(chan struct{}),
errc: make(chan error, 16),
pauseAcceptc: make(chan struct{}),
pauseTxc: make(chan struct{}),
blackholeTxc: make(chan struct{}),
pauseRxc: make(chan struct{}),
blackholeRxc: make(chan struct{}),
}
if p.dialTimeout == 0 {
p.dialTimeout = defaultDialTimeout
}
if p.bufferSize == 0 {
p.bufferSize = defaultBufferSize
}
if p.retryInterval == 0 {
p.retryInterval = defaultRetryInterval
}
if p.lg == nil {
p.lg = defaultLogger
}
close(p.pauseAcceptc)
close(p.pauseTxc)
close(p.pauseRxc)
if strings.HasPrefix(p.from.Scheme, "http") {
p.from.Scheme = "tcp"
}
if strings.HasPrefix(p.to.Scheme, "http") {
p.to.Scheme = "tcp"
}
var ln net.Listener
var err error
if !p.tlsInfo.Empty() {
ln, err = transport.NewListener(p.from.Host, p.from.Scheme, &p.tlsInfo)
} else {
ln, err = net.Listen(p.from.Scheme, p.from.Host)
}
if err != nil {
p.errc <- err
p.Close()
return p
}
p.listener = ln
p.closeWg.Add(1)
go p.listenAndServe()
p.lg.Info("started proxying", zap.String("from", p.From()), zap.String("to", p.To()))
return p
}
func (p *proxyServer) From() string {
return fmt.Sprintf("%s://%s", p.from.Scheme, p.from.Host)
}
func (p *proxyServer) To() string {
return fmt.Sprintf("%s://%s", p.to.Scheme, p.to.Host)
}
// TODO: implement packet reordering from multiple TCP connections
// buffer packets per connection for awhile, reorder before transmit
// - https://github.com/coreos/etcd/issues/5614
// - https://github.com/coreos/etcd/pull/6918#issuecomment-264093034
func (p *proxyServer) listenAndServe() {
defer p.closeWg.Done()
p.lg.Info("proxy is listening on", zap.String("from", p.From()))
close(p.readyc)
for {
p.acceptMu.Lock()
pausec := p.pauseAcceptc
p.acceptMu.Unlock()
select {
case <-pausec:
case <-p.donec:
return
}
p.latencyAcceptMu.RLock()
lat := p.latencyAccept
p.latencyAcceptMu.RUnlock()
if lat > 0 {
select {
case <-time.After(lat):
case <-p.donec:
return
}
}
p.listenerMu.RLock()
ln := p.listener
p.listenerMu.RUnlock()
in, err := ln.Accept()
if err != nil {
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
p.lg.Debug("listener accept error", zap.Error(err))
if strings.HasSuffix(err.Error(), "use of closed network connection") {
select {
case <-time.After(p.retryInterval):
case <-p.donec:
return
}
p.lg.Debug("listener is closed; retry listening on", zap.String("from", p.From()))
if err = p.ResetListener(); err != nil {
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
p.lg.Warn("failed to reset listener", zap.Error(err))
}
}
continue
}
var out net.Conn
if !p.tlsInfo.Empty() {
var tp *http.Transport
tp, err = transport.NewTransport(p.tlsInfo, p.dialTimeout)
if err != nil {
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
continue
}
out, err = tp.Dial(p.to.Scheme, p.to.Host)
} else {
out, err = net.Dial(p.to.Scheme, p.to.Host)
}
if err != nil {
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
p.lg.Debug("failed to dial", zap.Error(err))
continue
}
go func() {
// read incoming bytes from listener, dispatch to outgoing connection
p.transmit(out, in)
out.Close()
in.Close()
}()
go func() {
// read response from outgoing connection, write back to listener
p.receive(in, out)
in.Close()
out.Close()
}()
}
}
func (p *proxyServer) transmit(dst io.Writer, src io.Reader) { p.ioCopy(dst, src, true) }
func (p *proxyServer) receive(dst io.Writer, src io.Reader) { p.ioCopy(dst, src, false) }
func (p *proxyServer) ioCopy(dst io.Writer, src io.Reader, proxySend bool) {
buf := make([]byte, p.bufferSize)
for {
nr, err := src.Read(buf)
if err != nil {
if err == io.EOF {
return
}
// connection already closed
if strings.HasSuffix(err.Error(), "read: connection reset by peer") {
return
}
if strings.HasSuffix(err.Error(), "use of closed network connection") {
return
}
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
p.lg.Debug("failed to read", zap.Error(err))
return
}
if nr == 0 {
return
}
data := buf[:nr]
var pausec chan struct{}
var blackholec chan struct{}
if proxySend {
p.txMu.Lock()
pausec = p.pauseTxc
blackholec = p.blackholeTxc
p.txMu.Unlock()
} else {
p.rxMu.Lock()
pausec = p.pauseRxc
blackholec = p.blackholeRxc
p.rxMu.Unlock()
}
select {
case <-pausec:
case <-p.donec:
return
}
blackholed := false
select {
case <-blackholec:
blackholed = true
case <-p.donec:
return
default:
}
if blackholed {
if proxySend {
p.lg.Debug(
"dropped",
zap.String("data-size", humanize.Bytes(uint64(nr))),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
} else {
p.lg.Debug(
"dropped",
zap.String("data-size", humanize.Bytes(uint64(nr))),
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
continue
}
var lat time.Duration
if proxySend {
p.latencyTxMu.RLock()
lat = p.latencyTx
p.latencyTxMu.RUnlock()
} else {
p.latencyRxMu.RLock()
lat = p.latencyRx
p.latencyRxMu.RUnlock()
}
if lat > 0 {
select {
case <-time.After(lat):
case <-p.donec:
return
}
}
if proxySend {
p.corruptTxMu.RLock()
if p.corruptTx != nil {
data = p.corruptTx(data)
}
p.corruptTxMu.RUnlock()
} else {
p.corruptRxMu.RLock()
if p.corruptRx != nil {
data = p.corruptRx(data)
}
p.corruptRxMu.RUnlock()
}
var nw int
nw, err = dst.Write(data)
if err != nil {
if err == io.EOF {
return
}
select {
case p.errc <- err:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
if proxySend {
p.lg.Debug("failed to write while sending", zap.Error(err))
} else {
p.lg.Debug("failed to write while receiving", zap.Error(err))
}
return
}
if nr != nw {
select {
case p.errc <- io.ErrShortWrite:
select {
case <-p.donec:
return
default:
}
case <-p.donec:
return
}
if proxySend {
p.lg.Debug(
"failed to write while sending; read/write bytes are different",
zap.Int("read-bytes", nr),
zap.Int("write-bytes", nw),
zap.Error(io.ErrShortWrite),
)
} else {
p.lg.Debug(
"failed to write while receiving; read/write bytes are different",
zap.Int("read-bytes", nr),
zap.Int("write-bytes", nw),
zap.Error(io.ErrShortWrite),
)
}
return
}
if proxySend {
p.lg.Debug(
"transmitted",
zap.String("data-size", humanize.Bytes(uint64(nr))),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
} else {
p.lg.Debug(
"received",
zap.String("data-size", humanize.Bytes(uint64(nr))),
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
}
}
func (p *proxyServer) Ready() <-chan struct{} { return p.readyc }
func (p *proxyServer) Done() <-chan struct{} { return p.donec }
func (p *proxyServer) Error() <-chan error { return p.errc }
func (p *proxyServer) Close() (err error) {
p.closeOnce.Do(func() {
close(p.donec)
p.listenerMu.Lock()
if p.listener != nil {
err = p.listener.Close()
p.lg.Info(
"closed proxy listener",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
p.lg.Sync()
p.listenerMu.Unlock()
})
p.closeWg.Wait()
return err
}
func (p *proxyServer) DelayAccept(latency, rv time.Duration) {
if latency <= 0 {
return
}
d := computeLatency(latency, rv)
p.latencyAcceptMu.Lock()
p.latencyAccept = d
p.latencyAcceptMu.Unlock()
p.lg.Info(
"set accept latency",
zap.Duration("latency", d),
zap.Duration("given-latency", latency),
zap.Duration("given-latency-random-variable", rv),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UndelayAccept() {
p.latencyAcceptMu.Lock()
d := p.latencyAccept
p.latencyAccept = 0
p.latencyAcceptMu.Unlock()
p.lg.Info(
"removed accept latency",
zap.Duration("latency", d),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) LatencyAccept() time.Duration {
p.latencyAcceptMu.RLock()
d := p.latencyAccept
p.latencyAcceptMu.RUnlock()
return d
}
func (p *proxyServer) DelayTx(latency, rv time.Duration) {
if latency <= 0 {
return
}
d := computeLatency(latency, rv)
p.latencyTxMu.Lock()
p.latencyTx = d
p.latencyTxMu.Unlock()
p.lg.Info(
"set transmit latency",
zap.Duration("latency", d),
zap.Duration("given-latency", latency),
zap.Duration("given-latency-random-variable", rv),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UndelayTx() {
p.latencyTxMu.Lock()
d := p.latencyTx
p.latencyTx = 0
p.latencyTxMu.Unlock()
p.lg.Info(
"removed transmit latency",
zap.Duration("latency", d),
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) LatencyTx() time.Duration {
p.latencyTxMu.RLock()
d := p.latencyTx
p.latencyTxMu.RUnlock()
return d
}
func (p *proxyServer) DelayRx(latency, rv time.Duration) {
if latency <= 0 {
return
}
d := computeLatency(latency, rv)
p.latencyRxMu.Lock()
p.latencyRx = d
p.latencyRxMu.Unlock()
p.lg.Info(
"set receive latency",
zap.Duration("latency", d),
zap.Duration("given-latency", latency),
zap.Duration("given-latency-random-variable", rv),
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) UndelayRx() {
p.latencyRxMu.Lock()
d := p.latencyRx
p.latencyRx = 0
p.latencyRxMu.Unlock()
p.lg.Info(
"removed receive latency",
zap.Duration("latency", d),
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) LatencyRx() time.Duration {
p.latencyRxMu.RLock()
d := p.latencyRx
p.latencyRxMu.RUnlock()
return d
}
func computeLatency(lat, rv time.Duration) time.Duration {
if rv == 0 {
return lat
}
if rv < 0 {
rv *= -1
}
if rv > lat {
rv = lat / 10
}
now := time.Now()
mrand.Seed(int64(now.Nanosecond()))
sign := 1
if now.Second()%2 == 0 {
sign = -1
}
return lat + time.Duration(int64(sign)*mrand.Int63n(rv.Nanoseconds()))
}
func (p *proxyServer) PauseAccept() {
p.acceptMu.Lock()
p.pauseAcceptc = make(chan struct{})
p.acceptMu.Unlock()
p.lg.Info(
"paused accepting new connections",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UnpauseAccept() {
p.acceptMu.Lock()
select {
case <-p.pauseAcceptc: // already unpaused
case <-p.donec:
p.acceptMu.Unlock()
return
default:
close(p.pauseAcceptc)
}
p.acceptMu.Unlock()
p.lg.Info(
"unpaused accepting new connections",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) PauseTx() {
p.txMu.Lock()
p.pauseTxc = make(chan struct{})
p.txMu.Unlock()
p.lg.Info(
"paused transmit listen",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UnpauseTx() {
p.txMu.Lock()
select {
case <-p.pauseTxc: // already unpaused
case <-p.donec:
p.txMu.Unlock()
return
default:
close(p.pauseTxc)
}
p.txMu.Unlock()
p.lg.Info(
"unpaused transmit listen",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) PauseRx() {
p.rxMu.Lock()
p.pauseRxc = make(chan struct{})
p.rxMu.Unlock()
p.lg.Info(
"paused receive listen",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) UnpauseRx() {
p.rxMu.Lock()
select {
case <-p.pauseRxc: // already unpaused
case <-p.donec:
p.rxMu.Unlock()
return
default:
close(p.pauseRxc)
}
p.rxMu.Unlock()
p.lg.Info(
"unpaused receive listen",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) BlackholeTx() {
p.txMu.Lock()
select {
case <-p.blackholeTxc: // already blackholed
case <-p.donec:
p.txMu.Unlock()
return
default:
close(p.blackholeTxc)
}
p.txMu.Unlock()
p.lg.Info(
"blackholed transmit",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UnblackholeTx() {
p.txMu.Lock()
p.blackholeTxc = make(chan struct{})
p.txMu.Unlock()
p.lg.Info(
"unblackholed transmit",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) BlackholeRx() {
p.rxMu.Lock()
select {
case <-p.blackholeRxc: // already blackholed
case <-p.donec:
p.rxMu.Unlock()
return
default:
close(p.blackholeRxc)
}
p.rxMu.Unlock()
p.lg.Info(
"blackholed receive",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) UnblackholeRx() {
p.rxMu.Lock()
p.blackholeRxc = make(chan struct{})
p.rxMu.Unlock()
p.lg.Info(
"unblackholed receive",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) CorruptTx(f func([]byte) []byte) {
p.corruptTxMu.Lock()
p.corruptTx = f
p.corruptTxMu.Unlock()
p.lg.Info(
"corrupting transmit",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) UncorruptTx() {
p.corruptTxMu.Lock()
p.corruptTx = nil
p.corruptTxMu.Unlock()
p.lg.Info(
"stopped corrupting transmit",
zap.String("from", p.From()),
zap.String("to", p.To()),
)
}
func (p *proxyServer) CorruptRx(f func([]byte) []byte) {
p.corruptRxMu.Lock()
p.corruptRx = f
p.corruptRxMu.Unlock()
p.lg.Info(
"corrupting receive",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) UncorruptRx() {
p.corruptRxMu.Lock()
p.corruptRx = nil
p.corruptRxMu.Unlock()
p.lg.Info(
"stopped corrupting receive",
zap.String("from", p.To()),
zap.String("to", p.From()),
)
}
func (p *proxyServer) ResetListener() error {
p.listenerMu.Lock()
defer p.listenerMu.Unlock()
if err := p.listener.Close(); err != nil {
// already closed
if !strings.HasSuffix(err.Error(), "use of closed network connection") {
return err
}
}
var ln net.Listener
var err error
if !p.tlsInfo.Empty() {
ln, err = transport.NewListener(p.from.Host, p.from.Scheme, &p.tlsInfo)
} else {
ln, err = net.Listen(p.from.Scheme, p.from.Host)
}
if err != nil {
return err
}
p.listener = ln
p.lg.Info(
"reset listener on",
zap.String("from", p.From()),
)
return nil
}