http, crypto/tls: fix read timeouts and closing.

tls.Conn.Close() didn't close the underlying connection and tried to
do a handshake in order to send the close notify alert.

http didn't look for errors from the TLS handshake.

Fixes #2281.

R=bradfitz
CC=golang-dev
https://golang.org/cl/5283045

src/pkg/crypto/tls/conn.go

@@ -658,7 +658,9 @@ func (c *Conn) readHandshake() (interface{}, os.Error) {
 		if c.err != nil {
 			return nil, c.err
 		}
-		c.readRecord(recordTypeHandshake)
+		if err := c.readRecord(recordTypeHandshake); err != nil {
+			return nil, err
+		}
 	}
 
 	data := c.hand.Bytes()
@@ -671,7 +673,9 @@ func (c *Conn) readHandshake() (interface{}, os.Error) {
 		if c.err != nil {
 			return nil, c.err
 		}
-		c.readRecord(recordTypeHandshake)
+		if err := c.readRecord(recordTypeHandshake); err != nil {
+			return nil, err
+		}
 	}
 	data = c.hand.Next(4 + n)
 	var m handshakeMessage
@@ -762,10 +766,18 @@ func (c *Conn) Read(b []byte) (n int, err os.Error) {
 
 // Close closes the connection.
 func (c *Conn) Close() os.Error {
-	if err := c.Handshake(); err != nil {
+	var alertErr os.Error
+
+	c.handshakeMutex.Lock()
+	defer c.handshakeMutex.Unlock()
+	if c.handshakeComplete {
+		alertErr = c.sendAlert(alertCloseNotify)
+	}
+
+	if err := c.conn.Close(); err != nil {
 		return err
 	}
-	return c.sendAlert(alertCloseNotify)
+	return alertErr
 }
 
 // Handshake runs the client or server handshake

src/pkg/http/serve_test.go

@@ -536,10 +536,6 @@ func TestHeadResponses(t *testing.T) {
 }
 
 func TestTLSHandshakeTimeout(t *testing.T) {
-	if true {
-		t.Logf("Skipping broken test; issue 2281")
-		return
-	}
 	ts := httptest.NewUnstartedServer(HandlerFunc(func(w ResponseWriter, r *Request) {}))
 	ts.Config.ReadTimeout = 250e6
 	ts.StartTLS()

src/pkg/http/server.go

@@ -578,7 +578,10 @@ func (c *conn) serve() {
 	}()
 
 	if tlsConn, ok := c.rwc.(*tls.Conn); ok {
-		tlsConn.Handshake()
+		if err := tlsConn.Handshake(); err != nil {
+			c.close()
+			return
+		}
 		c.tlsState = new(tls.ConnectionState)
 		*c.tlsState = tlsConn.ConnectionState()
 	}