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/*
* 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 (
"bytes"
"fmt"
"net"
"strconv"
"strings"
"time"
"github.com/miekg/dns"
)
const yamlTimeFormat = "2006-01-02 15:04:05.999999999"
func yamlConvertMessage(m *Message, s *bytes.Buffer) {
s.WriteString(fmt.Sprint(" type: ", m.Type, "\n"))
if m.QueryTimeSec != nil && m.QueryTimeNsec != nil {
t := time.Unix(int64(*m.QueryTimeSec), int64(*m.QueryTimeNsec)).UTC()
s.WriteString(fmt.Sprint(" query_time: !!timestamp ", t.Format(yamlTimeFormat), "\n"))
}
if m.ResponseTimeSec != nil && m.ResponseTimeNsec != nil {
t := time.Unix(int64(*m.ResponseTimeSec), int64(*m.ResponseTimeNsec)).UTC()
s.WriteString(fmt.Sprint(" response_time: !!timestamp ", t.Format(yamlTimeFormat), "\n"))
}
if m.SocketFamily != nil {
s.WriteString(fmt.Sprint(" socket_family: ", m.SocketFamily, "\n"))
}
if m.SocketProtocol != nil {
s.WriteString(fmt.Sprint(" socket_protocol: ", m.SocketProtocol, "\n"))
}
if m.QueryAddress != nil {
s.WriteString(fmt.Sprint(" query_address: ", net.IP(m.QueryAddress), "\n"))
}
if m.ResponseAddress != nil {
s.WriteString(fmt.Sprint(" response_address: ", net.IP(m.ResponseAddress), "\n"))
}
if m.QueryPort != nil {
s.WriteString(fmt.Sprint(" query_port: ", *m.QueryPort, "\n"))
}
if m.ResponsePort != nil {
s.WriteString(fmt.Sprint(" response_port: ", *m.ResponsePort, "\n"))
}
if m.QueryZone != nil {
name, _, err := dns.UnpackDomainName(m.QueryZone, 0)
if err != nil {
fmt.Fprintf(s, " # query_zone: parse failed: %v\n", err)
} else {
s.WriteString(fmt.Sprint(" query_zone: ", strconv.Quote(name), "\n"))
}
}
if m.QueryMessage != nil {
msg := new(dns.Msg)
err := msg.Unpack(m.QueryMessage)
if err != nil {
fmt.Fprintf(s, " # query_message: parse failed: %v\n", err)
} else {
s.WriteString(" query_message: |\n")
s.WriteString(" " + strings.Replace(strings.TrimSpace(msg.String()), "\n", "\n ", -1) + "\n")
}
}
if m.ResponseMessage != nil {
msg := new(dns.Msg)
err := msg.Unpack(m.ResponseMessage)
if err != nil {
fmt.Fprintf(s, " # response_message: parse failed: %v\n", err)
} else {
s.WriteString(" response_message: |\n")
s.WriteString(" " + strings.Replace(strings.TrimSpace(msg.String()), "\n", "\n ", -1) + "\n")
}
}
s.WriteString("---\n")
}
// YamlFormat renders a dnstap message in YAML format. Any encapsulated DNS
// messages are rendered as strings in a format similar to 'dig' output.
func YamlFormat(dt *Dnstap) (out []byte, ok bool) {
var s bytes.Buffer
s.WriteString(fmt.Sprint("type: ", dt.Type, "\n"))
if dt.Identity != nil {
s.WriteString(fmt.Sprint("identity: ", strconv.Quote(string(dt.Identity)), "\n"))
}
if dt.Version != nil {
s.WriteString(fmt.Sprint("version: ", strconv.Quote(string(dt.Version)), "\n"))
}
if *dt.Type == Dnstap_MESSAGE {
s.WriteString("message:\n")
yamlConvertMessage(dt.Message, &s)
}
return s.Bytes(), true
}
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