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1
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/*
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2
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* Traditional DNS header OPCODEs (4-bits) defined by IANA in
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3
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* https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-5
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4
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*/
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5
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6
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exports.toString = function (opcode) {
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7
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switch (opcode) {
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8
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case 0: return 'QUERY'
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9
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case 1: return 'IQUERY'
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10
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case 2: return 'STATUS'
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11
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case 3: return 'OPCODE_3'
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12
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case 4: return 'NOTIFY'
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13
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case 5: return 'UPDATE'
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14
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case 6: return 'OPCODE_6'
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15
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case 7: return 'OPCODE_7'
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16
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case 8: return 'OPCODE_8'
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17
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case 9: return 'OPCODE_9'
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18
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case 10: return 'OPCODE_10'
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19
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case 11: return 'OPCODE_11'
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20
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case 12: return 'OPCODE_12'
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21
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case 13: return 'OPCODE_13'
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22
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case 14: return 'OPCODE_14'
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23
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case 15: return 'OPCODE_15'
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24
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}
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25
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return 'OPCODE_' + opcode
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26
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}
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27
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28
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exports.toOpcode = function (code) {
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29
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switch (code.toUpperCase()) {
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30
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case 'QUERY': return 0
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31
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case 'IQUERY': return 1
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32
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case 'STATUS': return 2
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33
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case 'OPCODE_3': return 3
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34
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case 'NOTIFY': return 4
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35
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case 'UPDATE': return 5
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36
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case 'OPCODE_6': return 6
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37
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case 'OPCODE_7': return 7
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38
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case 'OPCODE_8': return 8
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39
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case 'OPCODE_9': return 9
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40
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case 'OPCODE_10': return 10
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41
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case 'OPCODE_11': return 11
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42
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case 'OPCODE_12': return 12
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43
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case 'OPCODE_13': return 13
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44
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case 'OPCODE_14': return 14
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45
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case 'OPCODE_15': return 15
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46
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}
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47
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return 0
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48
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}
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