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dns-suite.js
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simplify dns.type.aaaa.js

This commit is contained in:
AJ ONeal 2017-01-30 11:21:06 -07:00
parent a05b5d27f2
commit 6d5251524b
2 changed files with 18 additions and 24 deletions
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2
bin/dns-parse.js
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@ -39,7 +39,7 @@ fs.readFileAsync(filename, null).then(function (nb) {
try {
record.data = pdns.unpackRdata(nb.buffer, packet, record);
} catch (e) {
console.error(e.stack);
console.error('[Error] unpackRdata: ' + e.message);
record.error = e;
}
}

36
dns.type.aaaa.js
View File

@ -6,34 +6,28 @@
exports.DNS_TYPE_AAAA = function (ab, packet, record) {
var ui8 = record.rdata;
console.log("ByteLength: " + ui8.byteLength);
console.log("normal length: " + ui8.length);
var rdataAb = ab.slice(record.rdstart, record.rdstart + record.rdlength);
// We can't use Uint16Array because it doesn't specify Endianness
// Intel x86, x64, and (usually) ARM are Little Endian, but Network Order is Big Endian
// DataView *does* let us specify endianness, so we can use that
// http://stackoverflow.com/questions/13514614/why-is-network-byte-order-defined-to-be-big-endian
var dv = new DataView(rdataAb);
var i = 0;
var s = '';
var z = 0;
for (var i = 0; i < ui8.length; i += 1) {
console.log(ui8[i].toString(16));
// Note: byteLength is always 16 for AAAA records
for (i = 0; i < dv.byteLength; i += 2) {
if (i%2 === 1 && ui8[i].toString(16).length < 2) {
s = s + '0' + ui8[i].toString(16);
} else {
s = s + ui8[i].toString(16);
if (ui8[i].toString(16) === '0' && i%2 === 0){
s = s.substring(0, s.length-1);
}
if (i > 0 && i < dv.byteLength) {
// add ':' between all... sedectets? sexdectets? ... pairs of two octets :)
s += ':';
}
if (i%2 === 1) {
s = s + ":"
// Big Endian Uint16 is specified by using `false`, Little Endian is `true`
s += dv.getUint16(i, false).toString(16);
}
if (i === 15) {
s = s.substring(0, s.length-1);
}
}
console.log(s);
return s;
};
}('undefined' !== typeof window ? window : exports));