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This commit is contained in:
Erik Wilson 2019-06-25 13:54:59 -07:00
parent 7090a7d551
commit d7590bc13f
11 changed files with 0 additions and 1168 deletions
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2
trash.lock
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@ -125,8 +125,6 @@ import:
version: v1.0.21
- package: github.com/google/gofuzz
version: 44d81051d367757e1c7c6a5a86423ece9afcf63c
- package: github.com/google/tcpproxy
version: dfa16c61dad2b18a385dfb351adf71566720535b
- package: github.com/googleapis/gnostic
version: 0c5108395e2debce0d731cf0287ddf7242066aba
- package: github.com/gorilla/mux

1
vendor.conf
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@ -30,7 +30,6 @@ golang.org/x/crypto a49355c7e3f8fe157a85be2f77e6e269a0f89602
gopkg.in/freddierice/go-losetup.v1 fc9adea44124401d8bfef3a97eaf61b5d44cc2c6
github.com/urfave/cli 8e01ec4cd3e2d84ab2fe90d8210528ffbb06d8ff
golang.org/x/sync 450f422ab23cf9881c94e2db30cac0eb1b7cf80c
github.com/google/tcpproxy dfa16c61dad2b18a385dfb351adf71566720535b
# flannel
github.com/golang/glog 23def4e6c14b4da8ac2ed8007337bc5eb5007998

2
vendor/github.com/google/tcpproxy/.gitignore generated vendored
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@ -1,2 +0,0 @@
tlsrouter
tlsrouter.test

49
vendor/github.com/google/tcpproxy/.travis.yml generated vendored
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@ -1,49 +0,0 @@
language: go
go:
- 1.8
- tip
os:
- linux
install:
- go get github.com/golang/lint/golint
before_script:
script:
- go get -t ./...
- go build ./...
- go test ./...
- go vet ./...
- golint -set_exit_status .
jobs:
include:
- stage: deploy
go: 1.8
install:
- gem install fpm
script:
- go build ./cmd/tlsrouter
- fpm -s dir -t deb -n tlsrouter -v $(date '+%Y%m%d%H%M%S')
--license Apache2
--vendor "David Anderson <dave@natulte.net>"
--maintainer "David Anderson <dave@natulte.net>"
--description "TLS SNI router"
--url "https://github.com/google/tlsrouter"
./tlsrouter=/usr/bin/tlsrouter
./systemd/tlsrouter.service=/lib/systemd/system/tlsrouter.service
deploy:
- provider: packagecloud
repository: tlsrouter
username: danderson
dist: debian/stretch
skip_cleanup: true
on:
branch: master
token:
secure: 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
- provider: script
on:
branch: master
script: go run scripts/prune_old_versions.go -user=danderson -repo=tlsrouter -distro=debian -version=stretch -package=tlsrouter -arch=amd64 -limit=2
env:
# Packagecloud API key, for prune_old_versions.go
- secure: "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"

8
vendor/github.com/google/tcpproxy/CONTRIBUTING.md generated vendored
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@ -1,8 +0,0 @@
Contributions are welcome by pull request.
You need to sign the Google Contributor License Agreement before your
contributions can be accepted. You can find the individual and organization
level CLAs here:
Individual: https://cla.developers.google.com/about/google-individual
Organization: https://cla.developers.google.com/about/google-corporate

202
vendor/github.com/google/tcpproxy/LICENSE generated vendored
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@ -1,202 +0,0 @@
Apache License
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http://www.apache.org/licenses/
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To apply the Apache License to your work, attach the following
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5
vendor/github.com/google/tcpproxy/README.md generated vendored
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@ -1,5 +0,0 @@
# tcpproxy
For library usage, see https://godoc.org/github.com/google/tcpproxy/
For CLI usage, see https://github.com/google/tcpproxy/blob/master/cmd/tlsrouter/README.md

125
vendor/github.com/google/tcpproxy/http.go generated vendored
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@ -1,125 +0,0 @@
// Copyright 2017 Google Inc.
//
// 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 tcpproxy
import (
"bufio"
"bytes"
"context"
"net/http"
)
// AddHTTPHostRoute appends a route to the ipPort listener that
// routes to dest if the incoming HTTP/1.x Host header name is
// httpHost. If it doesn't match, rule processing continues for any
// additional routes on ipPort.
//
// The ipPort is any valid net.Listen TCP address.
func (p *Proxy) AddHTTPHostRoute(ipPort, httpHost string, dest Target) {
p.AddHTTPHostMatchRoute(ipPort, equals(httpHost), dest)
}
// AddHTTPHostMatchRoute appends a route to the ipPort listener that
// routes to dest if the incoming HTTP/1.x Host header name is
// accepted by matcher. If it doesn't match, rule processing continues
// for any additional routes on ipPort.
//
// The ipPort is any valid net.Listen TCP address.
func (p *Proxy) AddHTTPHostMatchRoute(ipPort string, match Matcher, dest Target) {
p.addRoute(ipPort, httpHostMatch{match, dest})
}
type httpHostMatch struct {
matcher Matcher
target Target
}
func (m httpHostMatch) match(br *bufio.Reader) (Target, string) {
hh := httpHostHeader(br)
if m.matcher(context.TODO(), hh) {
return m.target, hh
}
return nil, ""
}
// httpHostHeader returns the HTTP Host header from br without
// consuming any of its bytes. It returns "" if it can't find one.
func httpHostHeader(br *bufio.Reader) string {
const maxPeek = 4 << 10
peekSize := 0
for {
peekSize++
if peekSize > maxPeek {
b, _ := br.Peek(br.Buffered())
return httpHostHeaderFromBytes(b)
}
b, err := br.Peek(peekSize)
if n := br.Buffered(); n > peekSize {
b, _ = br.Peek(n)
peekSize = n
}
if len(b) > 0 {
if b[0] < 'A' || b[0] > 'Z' {
// Doesn't look like an HTTP verb
// (GET, POST, etc).
return ""
}
if bytes.Index(b, crlfcrlf) != -1 || bytes.Index(b, lflf) != -1 {
req, err := http.ReadRequest(bufio.NewReader(bytes.NewReader(b)))
if err != nil {
return ""
}
if len(req.Header["Host"]) > 1 {
// TODO(bradfitz): what does
// ReadRequest do if there are
// multiple Host headers?
return ""
}
return req.Host
}
}
if err != nil {
return httpHostHeaderFromBytes(b)
}
}
}
var (
lfHostColon = []byte("\nHost:")
lfhostColon = []byte("\nhost:")
crlf = []byte("\r\n")
lf = []byte("\n")
crlfcrlf = []byte("\r\n\r\n")
lflf = []byte("\n\n")
)
func httpHostHeaderFromBytes(b []byte) string {
if i := bytes.Index(b, lfHostColon); i != -1 {
return string(bytes.TrimSpace(untilEOL(b[i+len(lfHostColon):])))
}
if i := bytes.Index(b, lfhostColon); i != -1 {
return string(bytes.TrimSpace(untilEOL(b[i+len(lfhostColon):])))
}
return ""
}
// untilEOL returns v, truncated before the first '\n' byte, if any.
// The returned slice may include a '\r' at the end.
func untilEOL(v []byte) []byte {
if i := bytes.IndexByte(v, '\n'); i != -1 {
return v[:i]
}
return v
}

108
vendor/github.com/google/tcpproxy/listener.go generated vendored
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@ -1,108 +0,0 @@
// Copyright 2017 Google Inc.
//
// 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 tcpproxy
import (
"io"
"net"
"sync"
)
// TargetListener implements both net.Listener and Target.
// Matched Targets become accepted connections.
type TargetListener struct {
Address string // Address is the string reported by TargetListener.Addr().String().
mu sync.Mutex
cond *sync.Cond
closed bool
nextConn net.Conn
}
var (
_ net.Listener = (*TargetListener)(nil)
_ Target = (*TargetListener)(nil)
)
func (tl *TargetListener) lock() {
tl.mu.Lock()
if tl.cond == nil {
tl.cond = sync.NewCond(&tl.mu)
}
}
type tcpAddr string
func (a tcpAddr) Network() string { return "tcp" }
func (a tcpAddr) String() string { return string(a) }
// Addr returns the listener's Address field as a net.Addr.
func (tl *TargetListener) Addr() net.Addr { return tcpAddr(tl.Address) }
// Close stops listening for new connections. All new connections
// routed to this listener will be closed. Already accepted
// connections are not closed.
func (tl *TargetListener) Close() error {
tl.lock()
if tl.closed {
tl.mu.Unlock()
return nil
}
tl.closed = true
tl.mu.Unlock()
tl.cond.Broadcast()
return nil
}
// HandleConn implements the Target interface. It blocks until tl is
// closed or another goroutine has called Accept and received c.
func (tl *TargetListener) HandleConn(c net.Conn) {
tl.lock()
defer tl.mu.Unlock()
for tl.nextConn != nil && !tl.closed {
tl.cond.Wait()
}
if tl.closed {
c.Close()
return
}
tl.nextConn = c
tl.cond.Broadcast() // Signal might be sufficient; verify.
for tl.nextConn == c && !tl.closed {
tl.cond.Wait()
}
if tl.closed {
c.Close()
return
}
}
// Accept implements the Accept method in the net.Listener interface.
func (tl *TargetListener) Accept() (net.Conn, error) {
tl.lock()
for tl.nextConn == nil && !tl.closed {
tl.cond.Wait()
}
if tl.closed {
tl.mu.Unlock()
return nil, io.EOF
}
c := tl.nextConn
tl.nextConn = nil
tl.mu.Unlock()
tl.cond.Broadcast() // Signal might be sufficient; verify.
return c, nil
}

192
vendor/github.com/google/tcpproxy/sni.go generated vendored
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@ -1,192 +0,0 @@
// Copyright 2017 Google Inc.
//
// 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 tcpproxy
import (
"bufio"
"bytes"
"context"
"crypto/tls"
"io"
"net"
"strings"
)
// AddSNIRoute appends a route to the ipPort listener that routes to
// dest if the incoming TLS SNI server name is sni. If it doesn't
// match, rule processing continues for any additional routes on
// ipPort.
//
// By default, the proxy will route all ACME tls-sni-01 challenges
// received on ipPort to all SNI dests. You can disable ACME routing
// with AddStopACMESearch.
//
// The ipPort is any valid net.Listen TCP address.
func (p *Proxy) AddSNIRoute(ipPort, sni string, dest Target) {
p.AddSNIMatchRoute(ipPort, equals(sni), dest)
}
// AddSNIMatchRoute appends a route to the ipPort listener that routes
// to dest if the incoming TLS SNI server name is accepted by
// matcher. If it doesn't match, rule processing continues for any
// additional routes on ipPort.
//
// By default, the proxy will route all ACME tls-sni-01 challenges
// received on ipPort to all SNI dests. You can disable ACME routing
// with AddStopACMESearch.
//
// The ipPort is any valid net.Listen TCP address.
func (p *Proxy) AddSNIMatchRoute(ipPort string, matcher Matcher, dest Target) {
cfg := p.configFor(ipPort)
if !cfg.stopACME {
if len(cfg.acmeTargets) == 0 {
p.addRoute(ipPort, &acmeMatch{cfg})
}
cfg.acmeTargets = append(cfg.acmeTargets, dest)
}
p.addRoute(ipPort, sniMatch{matcher, dest})
}
// AddStopACMESearch prevents ACME probing of subsequent SNI routes.
// Any ACME challenges on ipPort for SNI routes previously added
// before this call will still be proxied to all possible SNI
// backends.
func (p *Proxy) AddStopACMESearch(ipPort string) {
p.configFor(ipPort).stopACME = true
}
type sniMatch struct {
matcher Matcher
target Target
}
func (m sniMatch) match(br *bufio.Reader) (Target, string) {
sni := clientHelloServerName(br)
if m.matcher(context.TODO(), sni) {
return m.target, sni
}
return nil, ""
}
// acmeMatch matches "*.acme.invalid" ACME tls-sni-01 challenges and
// searches for a Target in cfg.acmeTargets that has the challenge
// response.
type acmeMatch struct {
cfg *config
}
func (m *acmeMatch) match(br *bufio.Reader) (Target, string) {
sni := clientHelloServerName(br)
if !strings.HasSuffix(sni, ".acme.invalid") {
return nil, ""
}
// TODO: cache. ACME issuers will hit multiple times in a short
// burst for each issuance event. A short TTL cache + singleflight
// should have an excellent hit rate.
// TODO: maybe an acme-specific timeout as well?
// TODO: plumb context upwards?
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
ch := make(chan Target, len(m.cfg.acmeTargets))
for _, target := range m.cfg.acmeTargets {
go tryACME(ctx, ch, target, sni)
}
for range m.cfg.acmeTargets {
if target := <-ch; target != nil {
return target, sni
}
}
// No target was happy with the provided challenge.
return nil, ""
}
func tryACME(ctx context.Context, ch chan<- Target, dest Target, sni string) {
var ret Target
defer func() { ch <- ret }()
conn, targetConn := net.Pipe()
defer conn.Close()
go dest.HandleConn(targetConn)
deadline, ok := ctx.Deadline()
if ok {
conn.SetDeadline(deadline)
}
client := tls.Client(conn, &tls.Config{
ServerName: sni,
InsecureSkipVerify: true,
})
if err := client.Handshake(); err != nil {
// TODO: log?
return
}
certs := client.ConnectionState().PeerCertificates
if len(certs) == 0 {
// TODO: log?
return
}
// acme says the first cert offered by the server must match the
// challenge hostname.
if err := certs[0].VerifyHostname(sni); err != nil {
// TODO: log?
return
}
// Target presented what looks like a valid challenge
// response, send it back to the matcher.
ret = dest
}
// clientHelloServerName returns the SNI server name inside the TLS ClientHello,
// without consuming any bytes from br.
// On any error, the empty string is returned.
func clientHelloServerName(br *bufio.Reader) (sni string) {
const recordHeaderLen = 5
hdr, err := br.Peek(recordHeaderLen)
if err != nil {
return ""
}
const recordTypeHandshake = 0x16
if hdr[0] != recordTypeHandshake {
return "" // Not TLS.
}
recLen := int(hdr[3])<<8 | int(hdr[4]) // ignoring version in hdr[1:3]
helloBytes, err := br.Peek(recordHeaderLen + recLen)
if err != nil {
return ""
}
tls.Server(sniSniffConn{r: bytes.NewReader(helloBytes)}, &tls.Config{
GetConfigForClient: func(hello *tls.ClientHelloInfo) (*tls.Config, error) {
sni = hello.ServerName
return nil, nil
},
}).Handshake()
return
}
// sniSniffConn is a net.Conn that reads from r, fails on Writes,
// and crashes otherwise.
type sniSniffConn struct {
r io.Reader
net.Conn // nil; crash on any unexpected use
}
func (c sniSniffConn) Read(p []byte) (int, error) { return c.r.Read(p) }
func (sniSniffConn) Write(p []byte) (int, error) { return 0, io.EOF }

474
vendor/github.com/google/tcpproxy/tcpproxy.go generated vendored
View File

@ -1,474 +0,0 @@
// Copyright 2017 Google Inc.
//
// 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 tcpproxy lets users build TCP proxies, optionally making
// routing decisions based on HTTP/1 Host headers and the SNI hostname
// in TLS connections.
//
// Typical usage:
//
// var p tcpproxy.Proxy
// p.AddHTTPHostRoute(":80", "foo.com", tcpproxy.To("10.0.0.1:8081"))
// p.AddHTTPHostRoute(":80", "bar.com", tcpproxy.To("10.0.0.2:8082"))
// p.AddRoute(":80", tcpproxy.To("10.0.0.1:8081")) // fallback
// p.AddSNIRoute(":443", "foo.com", tcpproxy.To("10.0.0.1:4431"))
// p.AddSNIRoute(":443", "bar.com", tcpproxy.To("10.0.0.2:4432"))
// p.AddRoute(":443", tcpproxy.To("10.0.0.1:4431")) // fallback
// log.Fatal(p.Run())
//
// Calling Run (or Start) on a proxy also starts all the necessary
// listeners.
//
// For each accepted connection, the rules for that ipPort are
// matched, in order. If one matches (currently HTTP Host, SNI, or
// always), then the connection is handed to the target.
//
// The two predefined Target implementations are:
//
// 1) DialProxy, proxying to another address (use the To func to return a
// DialProxy value),
//
// 2) TargetListener, making the matched connection available via a
// net.Listener.Accept call.
//
// But Target is an interface, so you can also write your own.
//
// Note that tcpproxy does not do any TLS encryption or decryption. It
// only (via DialProxy) copies bytes around. The SNI hostname in the TLS
// header is unencrypted, for better or worse.
//
// This package makes no API stability promises. If you depend on it,
// vendor it.
package tcpproxy
import (
"bufio"
"context"
"errors"
"fmt"
"io"
"log"
"net"
"time"
)
// Proxy is a proxy. Its zero value is a valid proxy that does
// nothing. Call methods to add routes before calling Start or Run.
//
// The order that routes are added in matters; each is matched in the order
// registered.
type Proxy struct {
configs map[string]*config // ip:port => config
lns []net.Listener
donec chan struct{} // closed before err
err error // any error from listening
// ListenFunc optionally specifies an alternate listen
// function. If nil, net.Dial is used.
// The provided net is always "tcp".
ListenFunc func(net, laddr string) (net.Listener, error)
}
// Matcher reports whether hostname matches the Matcher's criteria.
type Matcher func(ctx context.Context, hostname string) bool
// equals is a trivial Matcher that implements string equality.
func equals(want string) Matcher {
return func(_ context.Context, got string) bool {
return want == got
}
}
// config contains the proxying state for one listener.
type config struct {
routes []route
acmeTargets []Target // accumulates targets that should be probed for acme.
stopACME bool // if true, AddSNIRoute doesn't add targets to acmeTargets.
}
// A route matches a connection to a target.
type route interface {
// match examines the initial bytes of a connection, looking for a
// match. If a match is found, match returns a non-nil Target to
// which the stream should be proxied. match returns nil if the
// connection doesn't match.
//
// match must not consume bytes from the given bufio.Reader, it
// can only Peek.
//
// If an sni or host header was parsed successfully, that will be
// returned as the second parameter.
match(*bufio.Reader) (Target, string)
}
func (p *Proxy) netListen() func(net, laddr string) (net.Listener, error) {
if p.ListenFunc != nil {
return p.ListenFunc
}
return net.Listen
}
func (p *Proxy) configFor(ipPort string) *config {
if p.configs == nil {
p.configs = make(map[string]*config)
}
if p.configs[ipPort] == nil {
p.configs[ipPort] = &config{}
}
return p.configs[ipPort]
}
func (p *Proxy) addRoute(ipPort string, r route) {
cfg := p.configFor(ipPort)
cfg.routes = append(cfg.routes, r)
}
// AddRoute appends an always-matching route to the ipPort listener,
// directing any connection to dest.
//
// This is generally used as either the only rule (for simple TCP
// proxies), or as the final fallback rule for an ipPort.
//
// The ipPort is any valid net.Listen TCP address.
func (p *Proxy) AddRoute(ipPort string, dest Target) {
p.addRoute(ipPort, fixedTarget{dest})
}
type fixedTarget struct {
t Target
}
func (m fixedTarget) match(*bufio.Reader) (Target, string) { return m.t, "" }
// Run is calls Start, and then Wait.
//
// It blocks until there's an error. The return value is always
// non-nil.
func (p *Proxy) Run() error {
if err := p.Start(); err != nil {
return err
}
return p.Wait()
}
// Wait waits for the Proxy to finish running. Currently this can only
// happen if a Listener is closed, or Close is called on the proxy.
//
// It is only valid to call Wait after a successful call to Start.
func (p *Proxy) Wait() error {
<-p.donec
return p.err
}
// Close closes all the proxy's self-opened listeners.
func (p *Proxy) Close() error {
for _, c := range p.lns {
c.Close()
}
return nil
}
// Start creates a TCP listener for each unique ipPort from the
// previously created routes and starts the proxy. It returns any
// error from starting listeners.
//
// If it returns a non-nil error, any successfully opened listeners
// are closed.
func (p *Proxy) Start() error {
if p.donec != nil {
return errors.New("already started")
}
p.donec = make(chan struct{})
errc := make(chan error, len(p.configs))
p.lns = make([]net.Listener, 0, len(p.configs))
for ipPort, config := range p.configs {
ln, err := p.netListen()("tcp", ipPort)
if err != nil {
p.Close()
return err
}
p.lns = append(p.lns, ln)
go p.serveListener(errc, ln, config.routes)
}
go p.awaitFirstError(errc)
return nil
}
func (p *Proxy) awaitFirstError(errc <-chan error) {
p.err = <-errc
close(p.donec)
}
func (p *Proxy) serveListener(ret chan<- error, ln net.Listener, routes []route) {
for {
c, err := ln.Accept()
if err != nil {
ret <- err
return
}
go p.serveConn(c, routes)
}
}
// serveConn runs in its own goroutine and matches c against routes.
// It returns whether it matched purely for testing.
func (p *Proxy) serveConn(c net.Conn, routes []route) bool {
br := bufio.NewReader(c)
for _, route := range routes {
if target, hostName := route.match(br); target != nil {
if n := br.Buffered(); n > 0 {
peeked, _ := br.Peek(br.Buffered())
c = &Conn{
HostName: hostName,
Peeked: peeked,
Conn: c,
}
}
target.HandleConn(c)
return true
}
}
// TODO: hook for this?
log.Printf("tcpproxy: no routes matched conn %v/%v; closing", c.RemoteAddr().String(), c.LocalAddr().String())
c.Close()
return false
}
// Conn is an incoming connection that has had some bytes read from it
// to determine how to route the connection. The Read method stitches
// the peeked bytes and unread bytes back together.
type Conn struct {
// HostName is the hostname field that was sent to the request router.
// In the case of TLS, this is the SNI header, in the case of HTTPHost
// route, it will be the host header. In the case of a fixed
// route, i.e. those created with AddRoute(), this will always be
// empty. This can be useful in the case where further routing decisions
// need to be made in the Target impementation.
HostName string
// Peeked are the bytes that have been read from Conn for the
// purposes of route matching, but have not yet been consumed
// by Read calls. It set to nil by Read when fully consumed.
Peeked []byte
// Conn is the underlying connection.
// It can be type asserted against *net.TCPConn or other types
// as needed. It should not be read from directly unless
// Peeked is nil.
net.Conn
}
func (c *Conn) Read(p []byte) (n int, err error) {
if len(c.Peeked) > 0 {
n = copy(p, c.Peeked)
c.Peeked = c.Peeked[n:]
if len(c.Peeked) == 0 {
c.Peeked = nil
}
return n, nil
}
return c.Conn.Read(p)
}
// Target is what an incoming matched connection is sent to.
type Target interface {
// HandleConn is called when an incoming connection is
// matched. After the call to HandleConn, the tcpproxy
// package never touches the conn again. Implementations are
// responsible for closing the connection when needed.
//
// The concrete type of conn will be of type *Conn if any
// bytes have been consumed for the purposes of route
// matching.
HandleConn(net.Conn)
}
// To is shorthand way of writing &tlsproxy.DialProxy{Addr: addr}.
func To(addr string) *DialProxy {
return &DialProxy{Addr: addr}
}
// DialProxy implements Target by dialing a new connection to Addr
// and then proxying data back and forth.
//
// The To func is a shorthand way of creating a DialProxy.
type DialProxy struct {
// Addr is the TCP address to proxy to.
Addr string
// KeepAlivePeriod sets the period between TCP keep alives.
// If zero, a default is used. To disable, use a negative number.
// The keep-alive is used for both the client connection and
KeepAlivePeriod time.Duration
// DialTimeout optionally specifies a dial timeout.
// If zero, a default is used.
// If negative, the timeout is disabled.
DialTimeout time.Duration
// DialContext optionally specifies an alternate dial function
// for TCP targets. If nil, the standard
// net.Dialer.DialContext method is used.
DialContext func(ctx context.Context, network, address string) (net.Conn, error)
// OnDialError optionally specifies an alternate way to handle errors dialing Addr.
// If nil, the error is logged and src is closed.
// If non-nil, src is not closed automatically.
OnDialError func(src net.Conn, dstDialErr error)
// ProxyProtocolVersion optionally specifies the version of
// HAProxy's PROXY protocol to use. The PROXY protocol provides
// connection metadata to the DialProxy target, via a header
// inserted ahead of the client's traffic. The DialProxy target
// must explicitly support and expect the PROXY header; there is
// no graceful downgrade.
// If zero, no PROXY header is sent. Currently, version 1 is supported.
ProxyProtocolVersion int
}
// UnderlyingConn returns c.Conn if c of type *Conn,
// otherwise it returns c.
func UnderlyingConn(c net.Conn) net.Conn {
if wrap, ok := c.(*Conn); ok {
return wrap.Conn
}
return c
}
func goCloseConn(c net.Conn) { go c.Close() }
// HandleConn implements the Target interface.
func (dp *DialProxy) HandleConn(src net.Conn) {
ctx := context.Background()
var cancel context.CancelFunc
if dp.DialTimeout >= 0 {
ctx, cancel = context.WithTimeout(ctx, dp.dialTimeout())
}
dst, err := dp.dialContext()(ctx, "tcp", dp.Addr)
if cancel != nil {
cancel()
}
if err != nil {
dp.onDialError()(src, err)
return
}
defer goCloseConn(dst)
if err = dp.sendProxyHeader(dst, src); err != nil {
dp.onDialError()(src, err)
return
}
defer goCloseConn(src)
if ka := dp.keepAlivePeriod(); ka > 0 {
if c, ok := UnderlyingConn(src).(*net.TCPConn); ok {
c.SetKeepAlive(true)
c.SetKeepAlivePeriod(ka)
}
if c, ok := dst.(*net.TCPConn); ok {
c.SetKeepAlive(true)
c.SetKeepAlivePeriod(ka)
}
}
errc := make(chan error, 1)
go proxyCopy(errc, src, dst)
go proxyCopy(errc, dst, src)
<-errc
}
func (dp *DialProxy) sendProxyHeader(w io.Writer, src net.Conn) error {
switch dp.ProxyProtocolVersion {
case 0:
return nil
case 1:
var srcAddr, dstAddr *net.TCPAddr
if a, ok := src.RemoteAddr().(*net.TCPAddr); ok {
srcAddr = a
}
if a, ok := src.LocalAddr().(*net.TCPAddr); ok {
dstAddr = a
}
if srcAddr == nil || dstAddr == nil {
_, err := io.WriteString(w, "PROXY UNKNOWN\r\n")
return err
}
family := "TCP4"
if srcAddr.IP.To4() == nil {
family = "TCP6"
}
_, err := fmt.Fprintf(w, "PROXY %s %s %d %s %d\r\n", family, srcAddr.IP, srcAddr.Port, dstAddr.IP, dstAddr.Port)
return err
default:
return fmt.Errorf("PROXY protocol version %d not supported", dp.ProxyProtocolVersion)
}
}
// proxyCopy is the function that copies bytes around.
// It's a named function instead of a func literal so users get
// named goroutines in debug goroutine stack dumps.
func proxyCopy(errc chan<- error, dst, src net.Conn) {
// Before we unwrap src and/or dst, copy any buffered data.
if wc, ok := src.(*Conn); ok && len(wc.Peeked) > 0 {
if _, err := dst.Write(wc.Peeked); err != nil {
errc <- err
return
}
wc.Peeked = nil
}
// Unwrap the src and dst from *Conn to *net.TCPConn so Go
// 1.11's splice optimization kicks in.
src = UnderlyingConn(src)
dst = UnderlyingConn(dst)
_, err := io.Copy(dst, src)
errc <- err
}
func (dp *DialProxy) keepAlivePeriod() time.Duration {
if dp.KeepAlivePeriod != 0 {
return dp.KeepAlivePeriod
}
return time.Minute
}
func (dp *DialProxy) dialTimeout() time.Duration {
if dp.DialTimeout > 0 {
return dp.DialTimeout
}
return 10 * time.Second
}
var defaultDialer = new(net.Dialer)
func (dp *DialProxy) dialContext() func(ctx context.Context, network, address string) (net.Conn, error) {
if dp.DialContext != nil {
return dp.DialContext
}
return defaultDialer.DialContext
}
func (dp *DialProxy) onDialError() func(src net.Conn, dstDialErr error) {
if dp.OnDialError != nil {
return dp.OnDialError
}
return func(src net.Conn, dstDialErr error) {
log.Printf("tcpproxy: for incoming conn %v, error dialing %q: %v", src.RemoteAddr().String(), dp.Addr, dstDialErr)
src.Close()
}
}