WIP: middleware/dnstap (#711)

middleware/dnstap add

vendor/github.com/dnstap/golang-dnstap/FrameStreamInput.go

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2013-2014 by Farsight Security, 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 dnstap
+
+import (
+	"io"
+	"log"
+	"os"
+
+	"github.com/farsightsec/golang-framestream"
+)
+
+type FrameStreamInput struct {
+	wait    chan bool
+	decoder *framestream.Decoder
+}
+
+func NewFrameStreamInput(r io.ReadWriter, bi bool) (input *FrameStreamInput, err error) {
+	input = new(FrameStreamInput)
+	decoderOptions := framestream.DecoderOptions{
+		ContentType:   FSContentType,
+		Bidirectional: bi,
+	}
+	input.decoder, err = framestream.NewDecoder(r, &decoderOptions)
+	if err != nil {
+		return
+	}
+	input.wait = make(chan bool)
+	return
+}
+
+func NewFrameStreamInputFromFilename(fname string) (input *FrameStreamInput, err error) {
+	file, err := os.Open(fname)
+	if err != nil {
+		return nil, err
+	}
+	input, err = NewFrameStreamInput(file, false)
+	return
+}
+
+func (input *FrameStreamInput) ReadInto(output chan []byte) {
+	for {
+		buf, err := input.decoder.Decode()
+		if err != nil {
+			if err != io.EOF {
+				log.Printf("framestream.Decoder.Decode() failed: %s\n", err)
+			}
+			break
+		}
+		newbuf := make([]byte, len(buf))
+		copy(newbuf, buf)
+		output <- newbuf
+	}
+	close(input.wait)
+}
+
+func (input *FrameStreamInput) Wait() {
+	<-input.wait
+}