mirror of
https://github.com/kubenetworks/kubevpn.git
synced 2025-10-12 10:40:29 +08:00
118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
/*
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* Copyright (c) 2013-2019 by Farsight Security, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dnstap
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import (
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"fmt"
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"net"
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"os"
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"time"
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)
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// A FrameStreamSockInput collects dnstap data from one or more clients of
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// a listening socket.
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type FrameStreamSockInput struct {
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wait chan bool
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listener net.Listener
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timeout time.Duration
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log Logger
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}
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// NewFrameStreamSockInput creates a FrameStreamSockInput collecting dnstap
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// data from clients which connect to the given listener.
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func NewFrameStreamSockInput(listener net.Listener) (input *FrameStreamSockInput) {
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input = new(FrameStreamSockInput)
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input.listener = listener
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input.log = &nullLogger{}
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return
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}
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// SetTimeout sets the timeout for reading the initial handshake and writing
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// response control messages to clients of the FrameStreamSockInput's listener.
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//
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// The timeout is effective only for connections accepted after the call to
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// SetTimeout.
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func (input *FrameStreamSockInput) SetTimeout(timeout time.Duration) {
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input.timeout = timeout
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}
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// SetLogger configures a logger for the FrameStreamSockInput.
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func (input *FrameStreamSockInput) SetLogger(logger Logger) {
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input.log = logger
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}
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// NewFrameStreamSockInputFromPath creates a unix domain socket at the
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// given socketPath and returns a FrameStreamSockInput collecting dnstap
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// data from clients connecting to this socket.
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//
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// If a socket or other file already exists at socketPath,
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// NewFrameStreamSockInputFromPath removes it before creating the socket.
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func NewFrameStreamSockInputFromPath(socketPath string) (input *FrameStreamSockInput, err error) {
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os.Remove(socketPath)
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listener, err := net.Listen("unix", socketPath)
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if err != nil {
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return
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}
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return NewFrameStreamSockInput(listener), nil
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}
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// ReadInto accepts connections to the FrameStreamSockInput's listening
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// socket and sends all dnstap data read from these connections to the
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// output channel.
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//
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// ReadInto satisfies the dnstap Input interface.
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func (input *FrameStreamSockInput) ReadInto(output chan []byte) {
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var n uint64
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for {
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conn, err := input.listener.Accept()
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if err != nil {
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input.log.Printf("%s: accept failed: %v\n",
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input.listener.Addr(),
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err)
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continue
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}
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n++
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origin := ""
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switch conn.RemoteAddr().Network() {
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case "tcp", "tcp4", "tcp6":
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origin = fmt.Sprintf(" from %s", conn.RemoteAddr())
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}
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i, err := NewFrameStreamInputTimeout(conn, true, input.timeout)
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if err != nil {
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input.log.Printf("%s: connection %d: open input%s failed: %v",
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conn.LocalAddr(), n, origin, err)
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continue
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}
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input.log.Printf("%s: accepted connection %d%s",
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conn.LocalAddr(), n, origin)
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i.SetLogger(input.log)
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go func(cn uint64) {
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i.ReadInto(output)
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input.log.Printf("%s: closed connection %d%s",
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conn.LocalAddr(), cn, origin)
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}(n)
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}
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}
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// Wait satisfies the dnstap Input interface.
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//
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// The FrameSTreamSocketInput Wait method never returns, because the
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// corresponding Readinto method also never returns.
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func (input *FrameStreamSockInput) Wait() {
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select {}
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}
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