LittleChest/dns-packet-polyfill
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Convert Opcodes to/from strings.

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This commit is contained in:
Tom Pusateri 2018-01-06 14:08:41 -05:00
parent 2474fead8f
commit 0e95e8e18d
4 changed files with 60 additions and 3 deletions
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3
index.js
View File

@ -1,5 +1,6 @@
var types = require('./types') var types = require('./types')
var rcodes = require('./rcodes') var rcodes = require('./rcodes')
var opcodes = require('./opcodes')
var ip = require('ip') var ip = require('ip')
var Buffer = require('safe-buffer').Buffer var Buffer = require('safe-buffer').Buffer
@ -128,7 +129,7 @@ header.decode = function (buf, offset) {
type: flags & RESPONSE_FLAG ? 'response' : 'query', type: flags & RESPONSE_FLAG ? 'response' : 'query',
flags: flags & 32767, flags: flags & 32767,
flag_qr: ((flags >> 15) & 0x1) === 1, flag_qr: ((flags >> 15) & 0x1) === 1,
opcode: (flags >> 11) & 0xf, opcode: opcodes.toString((flags >> 11) & 0xf),
flag_auth: ((flags >> 10) & 0x1) === 1, flag_auth: ((flags >> 10) & 0x1) === 1,
flag_trunc: ((flags >> 9) & 0x1) === 1, flag_trunc: ((flags >> 9) & 0x1) === 1,
flag_rd: ((flags >> 8) & 0x1) === 1, flag_rd: ((flags >> 8) & 0x1) === 1,

48
opcodes.js Normal file
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@ -0,0 +1,48 @@
/*
* Traditional DNS header OPCODEs (4-bits) defined by IANA in
* https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-5
*/
exports.toString = function (opcode) {
switch (opcode) {
case 0: return 'QUERY'
case 1: return 'IQUERY'
case 2: return 'STATUS'
case 3: return 'OPCODE_3'
case 4: return 'NOTIFY'
case 5: return 'UPDATE'
case 6: return 'OPCODE_6'
case 7: return 'OPCODE_7'
case 8: return 'OPCODE_8'
case 9: return 'OPCODE_9'
case 10: return 'OPCODE_10'
case 11: return 'OPCODE_11'
case 12: return 'OPCODE_12'
case 13: return 'OPCODE_13'
case 14: return 'OPCODE_14'
case 15: return 'OPCODE_15'
}
return 'OPCODE_' + opcode
}
exports.toOpcode = function (code) {
switch (code.toUpperCase()) {
case 'QUERY': return 0
case 'IQUERY': return 1
case 'STATUS': return 2
case 'OPCODE_3': return 3
case 'NOTIFY': return 4
case 'UPDATE': return 5
case 'OPCODE_6': return 6
case 'OPCODE_7': return 7
case 'OPCODE_8': return 8
case 'OPCODE_9': return 9
case 'OPCODE_10': return 10
case 'OPCODE_11': return 11
case 'OPCODE_12': return 12
case 'OPCODE_13': return 13
case 'OPCODE_14': return 14
case 'OPCODE_15': return 15
}
return 0
}

3
package.json
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@ -33,7 +33,8 @@
"files": [ "files": [
"index.js", "index.js",
"types.js", "types.js",
"rcodes.js" "rcodes.js",
"opcodes.js"
], ],
"author": "Mathias Buus", "author": "Mathias Buus",
"license": "MIT" "license": "MIT"

9
test.js
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@ -1,6 +1,7 @@
var tape = require('tape') var tape = require('tape')
var packet = require('./') var packet = require('./')
var rcodes = require('./rcodes') var rcodes = require('./rcodes')
var opcodes = require('./opcodes')
var Buffer = require('safe-buffer').Buffer var Buffer = require('safe-buffer').Buffer
tape('unknown', function (t) { tape('unknown', function (t) {
@ -181,6 +182,12 @@ tape('rcode', function (t) {
t.ok(errors[i] === rcodes.toString(code), 'rcode conversion from/to string matches: ' + rcodes.toString(code)) t.ok(errors[i] === rcodes.toString(code), 'rcode conversion from/to string matches: ' + rcodes.toString(code))
} }
const ops = ['QUERY', 'IQUERY', 'STATUS', 'OPCODE_3', 'NOTIFY', 'UPDATE', 'OPCODE_6', 'OPCODE_7', 'OPCODE_8', 'OPCODE_9', 'OPCODE_10', 'OPCODE_11', 'OPCODE_12', 'OPCODE_13', 'OPCODE_14', 'OPCODE_15']
for (i in ops) {
code = opcodes.toOpcode(ops[i])
t.ok(ops[i] === opcodes.toString(code), 'opcode conversion from/to string matches: ' + opcodes.toString(code))
}
var buf = packet.encode({ var buf = packet.encode({
type: 'response', type: 'response',
id: 45632, id: 45632,
@ -193,7 +200,7 @@ tape('rcode', function (t) {
}) })
var val = packet.decode(buf) var val = packet.decode(buf)
t.ok(val.type === 'response', 'decode type') t.ok(val.type === 'response', 'decode type')
t.ok(val.opcode === 0, 'decode opcode') t.ok(val.opcode === 'QUERY', 'decode opcode')
t.ok(val.flag_qr === true, 'decode flag_auth') t.ok(val.flag_qr === true, 'decode flag_auth')
t.ok(val.flag_auth === true, 'decode flag_auth') t.ok(val.flag_auth === true, 'decode flag_auth')
t.ok(val.flag_trunc === false, 'decode flag_trunc') t.ok(val.flag_trunc === false, 'decode flag_trunc')