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/*
* Copyright (c) 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 (
"net"
"time"
)
// A FrameStreamSockOutput manages a socket connection and sends dnstap
// data over a framestream connection on that socket.
type FrameStreamSockOutput struct {
address net.Addr
outputChannel chan []byte
wait chan bool
wopt SocketWriterOptions
}
// NewFrameStreamSockOutput creates a FrameStreamSockOutput manaaging a
// connection to the given address.
func NewFrameStreamSockOutput(address net.Addr) (*FrameStreamSockOutput, error) {
return &FrameStreamSockOutput{
address: address,
outputChannel: make(chan []byte, outputChannelSize),
wait: make(chan bool),
wopt: SocketWriterOptions{
FlushTimeout: 5 * time.Second,
RetryInterval: 10 * time.Second,
Dialer: &net.Dialer{
Timeout: 30 * time.Second,
},
Logger: &nullLogger{},
},
}, nil
}
// SetTimeout sets the write timeout for data and control messages and the
// read timeout for handshake responses on the FrameStreamSockOutput's
// connection. The default timeout is zero, for no timeout.
func (o *FrameStreamSockOutput) SetTimeout(timeout time.Duration) {
o.wopt.Timeout = timeout
}
// SetFlushTimeout sets the maximum time data will be kept in the output
// buffer.
//
// The default flush timeout is five seconds.
func (o *FrameStreamSockOutput) SetFlushTimeout(timeout time.Duration) {
o.wopt.FlushTimeout = timeout
}
// SetRetryInterval specifies how long the FrameStreamSockOutput will wait
// before re-establishing a failed connection. The default retry interval
// is 10 seconds.
func (o *FrameStreamSockOutput) SetRetryInterval(retry time.Duration) {
o.wopt.RetryInterval = retry
}
// SetDialer replaces the default net.Dialer for re-establishing the
// the FrameStreamSockOutput connection. This can be used to set the
// timeout for connection establishment and enable keepalives
// new connections.
//
// FrameStreamSockOutput uses a default dialer with a 30 second
// timeout.
func (o *FrameStreamSockOutput) SetDialer(dialer *net.Dialer) {
o.wopt.Dialer = dialer
}
// SetLogger configures FrameStreamSockOutput to log through the given
// Logger.
func (o *FrameStreamSockOutput) SetLogger(logger Logger) {
o.wopt.Logger = logger
}
// GetOutputChannel returns the channel on which the
// FrameStreamSockOutput accepts data.
//
// GetOutputChannel satisifes the dnstap Output interface.
func (o *FrameStreamSockOutput) GetOutputChannel() chan []byte {
return o.outputChannel
}
// RunOutputLoop reads data from the output channel and sends it over
// a connections to the FrameStreamSockOutput's address, establishing
// the connection as needed.
//
// RunOutputLoop satisifes the dnstap Output interface.
func (o *FrameStreamSockOutput) RunOutputLoop() {
w := NewSocketWriter(o.address, &o.wopt)
for b := range o.outputChannel {
// w is of type *SocketWriter, whose Write implementation
// handles all errors by retrying the connection.
w.WriteFrame(b)
}
w.Close()
close(o.wait)
return
}
// Close shuts down the FrameStreamSockOutput's output channel and returns
// after all pending data has been flushed and the connection has been closed.
//
// Close satisifes the dnstap Output interface
func (o *FrameStreamSockOutput) Close() {
close(o.outputChannel)
<-o.wait
}
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