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