mirror of
https://github.com/kubenetworks/kubevpn.git
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58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
/*
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* Copyright (c) 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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framestream "github.com/farsightsec/golang-framestream"
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"google.golang.org/protobuf/proto"
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)
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// A Decoder reads and parses Dnstap messages from an io.Reader
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type Decoder struct {
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buf []byte
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r Reader
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}
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// NewDecoder creates a Decoder using the given dnstap Reader, accepting
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// dnstap data frames up to maxSize in size.
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func NewDecoder(r Reader, maxSize int) *Decoder {
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return &Decoder{
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buf: make([]byte, maxSize),
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r: r,
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}
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}
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// Decode reads and parses a Dnstap message from the Decoder's Reader.
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// Decode silently discards data frames larger than the Decoder's configured
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// maxSize.
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func (d *Decoder) Decode(m *Dnstap) error {
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for {
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n, err := d.r.ReadFrame(d.buf)
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switch err {
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case framestream.ErrDataFrameTooLarge:
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continue
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case nil:
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break
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default:
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return err
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}
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return proto.Unmarshal(d.buf[:n], m)
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}
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}
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