feat: add vendor

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

@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2013-2019 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 (
+	"fmt"
+	"net"
+	"os"
+	"time"
+)
+
+// A FrameStreamSockInput collects dnstap data from one or more clients of
+// a listening socket.
+type FrameStreamSockInput struct {
+	wait     chan bool
+	listener net.Listener
+	timeout  time.Duration
+	log      Logger
+}
+
+// NewFrameStreamSockInput creates a FrameStreamSockInput collecting dnstap
+// data from clients which connect to the given listener.
+func NewFrameStreamSockInput(listener net.Listener) (input *FrameStreamSockInput) {
+	input = new(FrameStreamSockInput)
+	input.listener = listener
+	input.log = &nullLogger{}
+	return
+}
+
+// SetTimeout sets the timeout for reading the initial handshake and writing
+// response control messages to clients of the FrameStreamSockInput's listener.
+//
+// The timeout is effective only for connections accepted after the call to
+// SetTimeout.
+func (input *FrameStreamSockInput) SetTimeout(timeout time.Duration) {
+	input.timeout = timeout
+}
+
+// SetLogger configures a logger for the FrameStreamSockInput.
+func (input *FrameStreamSockInput) SetLogger(logger Logger) {
+	input.log = logger
+}
+
+// NewFrameStreamSockInputFromPath creates a unix domain socket at the
+// given socketPath and returns a FrameStreamSockInput collecting dnstap
+// data from clients connecting to this socket.
+//
+// If a socket or other file already exists at socketPath,
+// NewFrameStreamSockInputFromPath removes it before creating the socket.
+func NewFrameStreamSockInputFromPath(socketPath string) (input *FrameStreamSockInput, err error) {
+	os.Remove(socketPath)
+	listener, err := net.Listen("unix", socketPath)
+	if err != nil {
+		return
+	}
+	return NewFrameStreamSockInput(listener), nil
+}
+
+// ReadInto accepts connections to the FrameStreamSockInput's listening
+// socket and sends all dnstap data read from these connections to the
+// output channel.
+//
+// ReadInto satisfies the dnstap Input interface.
+func (input *FrameStreamSockInput) ReadInto(output chan []byte) {
+	var n uint64
+	for {
+		conn, err := input.listener.Accept()
+		if err != nil {
+			input.log.Printf("%s: accept failed: %v\n",
+				input.listener.Addr(),
+				err)
+			continue
+		}
+		n++
+		origin := ""
+		switch conn.RemoteAddr().Network() {
+		case "tcp", "tcp4", "tcp6":
+			origin = fmt.Sprintf(" from %s", conn.RemoteAddr())
+		}
+		i, err := NewFrameStreamInputTimeout(conn, true, input.timeout)
+		if err != nil {
+			input.log.Printf("%s: connection %d: open input%s failed: %v",
+				conn.LocalAddr(), n, origin, err)
+			continue
+		}
+		input.log.Printf("%s: accepted connection %d%s",
+			conn.LocalAddr(), n, origin)
+		i.SetLogger(input.log)
+		go func(cn uint64) {
+			i.ReadInto(output)
+			input.log.Printf("%s: closed connection %d%s",
+				conn.LocalAddr(), cn, origin)
+		}(n)
+	}
+}
+
+// Wait satisfies the dnstap Input interface.
+//
+// The FrameSTreamSocketInput Wait method never returns, because the
+// corresponding Readinto method also never returns.
+func (input *FrameStreamSockInput) Wait() {
+	select {}
+}