Merge bradfitz's tcpproxy codebase with the software formerly known as tlsrouter.

Brad's code will be the place for future development, and the base for the binary
formerly known as tlsrouter. This merge is the first step towards converging the
codebases.

1 files changed, 270 insertions, 0 deletions

diff --git a/tcpproxy_test.go b/tcpproxy_test.go
new file mode 100644
index 0000000..4cfb0ab
--- /dev/null
+++ b/tcpproxy_test.go
@@ -0,0 +1,270 @@
+// 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"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+	"testing"
+)
+
+func TestMatchHTTPHost(t *testing.T) {
+	tests := []struct {
+		name string
+		r    io.Reader
+		host string
+		want bool
+	}{
+		{
+			name: "match",
+			r:    strings.NewReader("GET / HTTP/1.1\r\nHost: foo.com\r\n\r\n"),
+			host: "foo.com",
+			want: true,
+		},
+		{
+			name: "no-match",
+			r:    strings.NewReader("GET / HTTP/1.1\r\nHost: foo.com\r\n\r\n"),
+			host: "bar.com",
+			want: false,
+		},
+		{
+			name: "match-huge-request",
+			r:    io.MultiReader(strings.NewReader("GET / HTTP/1.1\r\nHost: foo.com\r\n"), neverEnding('a')),
+			host: "foo.com",
+			want: true,
+		},
+	}
+	for i, tt := range tests {
+		name := tt.name
+		if name == "" {
+			name = fmt.Sprintf("test_index_%d", i)
+		}
+		t.Run(name, func(t *testing.T) {
+			br := bufio.NewReader(tt.r)
+			var matcher matcher = httpHostMatch(tt.host)
+			got := matcher.match(br)
+			if got != tt.want {
+				t.Fatalf("match = %v; want %v", got, tt.want)
+			}
+			get := make([]byte, 3)
+			if _, err := io.ReadFull(br, get); err != nil {
+				t.Fatal(err)
+			}
+			if string(get) != "GET" {
+				t.Fatalf("did bufio.Reader consume bytes? got %q; want GET", get)
+			}
+		})
+	}
+}
+
+type neverEnding byte
+
+func (b neverEnding) Read(p []byte) (n int, err error) {
+	for i := range p {
+		p[i] = byte(b)
+	}
+	return len(p), nil
+}
+
+type recordWritesConn struct {
+	buf bytes.Buffer
+	net.Conn
+}
+
+func (c *recordWritesConn) Write(p []byte) (int, error) {
+	c.buf.Write(p)
+	return len(p), nil
+}
+
+func (c *recordWritesConn) Read(p []byte) (int, error) { return 0, io.EOF }
+
+func clientHelloRecord(t *testing.T, hostName string) string {
+	rec := new(recordWritesConn)
+	cl := tls.Client(rec, &tls.Config{ServerName: hostName})
+	cl.Handshake()
+
+	s := rec.buf.String()
+	if !strings.Contains(s, hostName) {
+		t.Fatalf("clientHello sent in test didn't contain %q", hostName)
+	}
+	return s
+}
+
+func TestSNI(t *testing.T) {
+	const hostName = "foo.com"
+	greeting := clientHelloRecord(t, hostName)
+	got := clientHelloServerName(bufio.NewReader(strings.NewReader(greeting)))
+	if got != hostName {
+		t.Errorf("got SNI %q; want %q", got, hostName)
+	}
+}
+
+func TestProxyStartNone(t *testing.T) {
+	var p Proxy
+	if err := p.Start(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func newLocalListener(t *testing.T) net.Listener {
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		ln, err = net.Listen("tcp", "[::1]:0")
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+	return ln
+}
+
+const testFrontAddr = "1.2.3.4:567"
+
+func testListenFunc(t *testing.T, ln net.Listener) func(network, laddr string) (net.Listener, error) {
+	return func(network, laddr string) (net.Listener, error) {
+		if network != "tcp" {
+			t.Errorf("got Listen call with network %q, not tcp", network)
+			return nil, errors.New("invalid network")
+		}
+		if laddr != testFrontAddr {
+			t.Fatalf("got Listen call with laddr %q, want %q", laddr, testFrontAddr)
+			panic("bogus address")
+		}
+		return ln, nil
+	}
+}
+
+func testProxy(t *testing.T, front net.Listener) *Proxy {
+	return &Proxy{
+		ListenFunc: testListenFunc(t, front),
+	}
+}
+
+func TestProxyAlwaysMatch(t *testing.T) {
+	front := newLocalListener(t)
+	defer front.Close()
+	back := newLocalListener(t)
+	defer back.Close()
+
+	p := testProxy(t, front)
+	p.AddRoute(testFrontAddr, To(back.Addr().String()))
+	if err := p.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	toFront, err := net.Dial("tcp", front.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer toFront.Close()
+
+	fromProxy, err := back.Accept()
+	if err != nil {
+		t.Fatal(err)
+	}
+	const msg = "message"
+	io.WriteString(toFront, msg)
+
+	buf := make([]byte, len(msg))
+	if _, err := io.ReadFull(fromProxy, buf); err != nil {
+		t.Fatal(err)
+	}
+	if string(buf) != msg {
+		t.Fatalf("got %q; want %q", buf, msg)
+	}
+}
+
+func TestProxyHTTP(t *testing.T) {
+	front := newLocalListener(t)
+	defer front.Close()
+
+	backFoo := newLocalListener(t)
+	defer backFoo.Close()
+	backBar := newLocalListener(t)
+	defer backBar.Close()
+
+	p := testProxy(t, front)
+	p.AddHTTPHostRoute(testFrontAddr, "foo.com", To(backFoo.Addr().String()))
+	p.AddHTTPHostRoute(testFrontAddr, "bar.com", To(backBar.Addr().String()))
+	if err := p.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	toFront, err := net.Dial("tcp", front.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer toFront.Close()
+
+	const msg = "GET / HTTP/1.1\r\nHost: bar.com\r\n\r\n"
+	io.WriteString(toFront, msg)
+
+	fromProxy, err := backBar.Accept()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	buf := make([]byte, len(msg))
+	if _, err := io.ReadFull(fromProxy, buf); err != nil {
+		t.Fatal(err)
+	}
+	if string(buf) != msg {
+		t.Fatalf("got %q; want %q", buf, msg)
+	}
+}
+
+func TestProxySNI(t *testing.T) {
+	front := newLocalListener(t)
+	defer front.Close()
+
+	backFoo := newLocalListener(t)
+	defer backFoo.Close()
+	backBar := newLocalListener(t)
+	defer backBar.Close()
+
+	p := testProxy(t, front)
+	p.AddSNIRoute(testFrontAddr, "foo.com", To(backFoo.Addr().String()))
+	p.AddSNIRoute(testFrontAddr, "bar.com", To(backBar.Addr().String()))
+	if err := p.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	toFront, err := net.Dial("tcp", front.Addr().String())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer toFront.Close()
+
+	msg := clientHelloRecord(t, "bar.com")
+	io.WriteString(toFront, msg)
+
+	fromProxy, err := backBar.Accept()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	buf := make([]byte, len(msg))
+	if _, err := io.ReadFull(fromProxy, buf); err != nil {
+		t.Fatal(err)
+	}
+	if string(buf) != msg {
+		t.Fatalf("got %q; want %q", buf, msg)
+	}
+}