coolaj86/dns-suite.js
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more helpful error

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AJ ONeal 2017-02-11 09:32:50 -07:00
parent 92e85bead3
commit 8148e25d18
2 changed files with 28 additions and 15 deletions
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34
dns.parser.js
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@ -58,11 +58,11 @@ pdns.unpack = function (ab) {
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DataView
var dv = new DataView(ab);
var id = dv.getUint16(0, false);
packet.header = pdns.unpackHeader(dv.getUint16(2, false));
var qdcount = dv.getUint16(4, false); // query count
var ancount = dv.getUint16(6, false); // answer count
var nscount = dv.getUint16(8, false); // authority count
var arcount = dv.getUint16(10, false); // additional count
packet.header = pdns.unpackHeader(dv.getUint16(2, false));
packet.qdcount = dv.getUint16(4, false); // query count
packet.ancount = dv.getUint16(6, false); // answer count
packet.nscount = dv.getUint16(8, false); // authority count
packet.arcount = dv.getUint16(10, false); // additional count
var total = 12;
var i;
var rec;
@ -114,6 +114,7 @@ pdns.unpack = function (ab) {
function unpackAnswer(ab, dv, ui8, total) {
var ototal = total;
var err;
var q = pdns._unpackLabels(ui8, total, {
name: ''
, type: 0
@ -136,10 +137,15 @@ pdns.unpack = function (ab) {
if (ab.byteLength - total < 10) {
// console.error(str.join(''));
throw new Error(
//console.error(JSON.stringify(packet, null, 1));
//console.error(JSON.stringify(q, null, 1));
err = new Error(
"Expected a 2-byte QTYPE, 2-byte QCLASS, 4-byte TTL, and 2-byte RDLENGTH following " + total + "-byte QNAME"
+ " but packet itself has " + (ab.byteLength - total) + " bytes remaining"
);
err.packet = packet;
err.record = q;
throw err;
}
q.type = dv.getUint16(total, false);
@ -171,33 +177,33 @@ pdns.unpack = function (ab) {
packet.header.id = id;
console.log('qdcount', qdcount);
console.log('qdcount', packet.qdcount);
packet.question = [];
for (i = 0; i < qdcount; i += 1) {
for (i = 0; i < packet.qdcount; i += 1) {
rec = unpackQuestion(ab, dv, ui8, total);
total += rec.byteLength;
packet.question.push(rec);
}
console.log('ancount', ancount);
console.log('ancount', packet.ancount);
packet.answer = [];
for (i = 0; i < ancount; i += 1) {
for (i = 0; i < packet.ancount; i += 1) {
rec = unpackAnswer(ab, dv, ui8, total);
total += rec.byteLength;
packet.answer.push(rec);
}
console.log('nscount', nscount);
console.log('nscount', packet.nscount);
packet.authority = [];
for (i = 0; i < nscount; i += 1) {
for (i = 0; i < packet.nscount; i += 1) {
rec = unpackAnswer(ab, dv, ui8, total);
total += rec.byteLength;
packet.authority.push(rec);
}
console.log('arcount', arcount);
console.log('arcount', packet.arcount);
packet.additional = [];
for (i = 0; i < arcount; i += 1) {
for (i = 0; i < packet.arcount; i += 1) {
rec = unpackAnswer(ab, dv, ui8, total);
total += rec.byteLength;
packet.additional.push(rec);

9
test/parser.js
View File

@ -8,6 +8,7 @@
var path = require('path');
var dnsjs = require('../').DNSPacket;
var expected; // shim
var onefile = process.argv[2];
var dirname = path.join(__dirname, 'fixtures');
@ -42,6 +43,9 @@
}
fs.readdirSync(dirname).forEach(function (name) {
if (onefile && !onefile.split(',').some(function (f) { return name.match(onefile); })) {
return;
}
if (!/\.bin$/.test(name)) {
return;
}
@ -58,8 +62,11 @@
try {
result = dnsjs.parse(ab);
} catch(e) {
console.error('[Error] parse error');
console.log(ab);
console.error('[Error] ' + e.message);
console.error(e.packet);
console.error(e.record);
console.error(e.stack);
console.error('');
//console.error(e.stack);
return;