coolaj86/dns-suite.js
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maker rr more similar to node-dns

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This commit is contained in:
AJ ONeal 2017-10-05 15:02:25 -06:00
parent 3692e4c828
commit eca24330e1
2 changed files with 33 additions and 27 deletions
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37
packer/type.soa.js
View File

@ -2,6 +2,7 @@
'use strict';
// http://www.zytrax.com/books/dns/ch8/soa.html
// https://github.com/tjfontaine/node-dns#resourcerecord
// Value Meaning/Use
// Primary NS Variable length. The name of the Primary Master for the domain. May be a label, pointer, or any combination
@ -13,25 +14,25 @@
// Minimum TTL Unsigned 32-bit integer
exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
if(!record.name_server){
if(!record.primary && !record.name_server){
throw new Error("no name server for SOA record");
}
if(!record.email_addr){
if(!record.admin && !record.email_addr){
throw new Error("ne email address for SOA record");
}
if(!record.sn){
if(!record.serial && !record.sn){
throw new Error("no serial number for SOA record");
}
if(!record.ref){
if(!record.refresh && !record.ref){
throw new Error("no refresh for SOA record");
}
if(!record.ret){
if(!record.retry && !record.ret){
throw new Error("no update retry for SOA record");
}
if(!record.ex){
if(!record.expiration && !record.ex){
throw new Error("no expiry for SOA record");
}
if(!record.nx){
if(!record.minimum && !record.nx){
throw new Error("no nxdomain for SOA record");
}
@ -40,9 +41,9 @@ exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
var rdLenIndex = total;
total += 2; // Save space for RDLENGTH
console.log('record.name_server', 1 + record.name_server.length, record.name_server);
//console.log('record.name_server', 1 + record.name_server.length, record.name_server);
// pack name_server which is a sequence of labels
record.name_server.split('.').forEach(function (label) {
(record.primary || record.name_server).split('.').forEach(function (label) {
soaLen += (1 + label.length);
dv.setUint8(total, label.length, false);
@ -58,9 +59,9 @@ exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
total += 1;
soaLen += 1;
console.log('record.email_addr', 1 + record.email_addr.length, record.email_addr);
//console.log('record.email_addr', 1 + record.email_addr.length, record.email_addr);
// pack email address which is a sequence of labels
record.email_addr.split('.').forEach(function (label) {
(record.admin || record.email_addr).split('.').forEach(function (label) {
soaLen += 1 + label.length;
dv.setUint8(total, label.length, false);
@ -77,20 +78,20 @@ exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
soaLen += 1;
// pack all 32-bit values
dv.setUint32(total, parseInt(record.sn, 10), false);
dv.setUint32(total, parseInt(record.serial || record.sn, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ref, 10), false);
dv.setUint32(total, parseInt(record.refresh || record.ref, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ret, 10), false);
dv.setUint32(total, parseInt(record.retry || record.ret, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ex, 10), false);
dv.setUint32(total, parseInt(record.expiration || record.ex, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.nx, 10), false);
dv.setUint32(total, parseInt(record.minimum || record.nx, 10), false);
total+=4;
// RDLENGTH
console.log('rdAt', rdLenIndex);
console.log('soaLen (lables + 2 + 20)', soaLen);
//console.log('rdAt', rdLenIndex);
//console.log('soaLen (lables + 2 + 20)', soaLen);
dv.setUint16(rdLenIndex, soaLen, false);
return total;

23
parser/type.soa.js
View File

@ -13,18 +13,22 @@
var unpackLabels = exports.DNS_UNPACK_LABELS || require('../dns.unpack-labels.js').DNS_UNPACK_LABELS;
exports.DNS_PARSER_TYPE_SOA = function (ab, packet, record) {
//
// Look!
// http://www.peerwisdom.org/2013/05/15/dns-understanding-the-soa-record/
var rdataAb = ab.slice(record.rdstart, record.rdstart + record.rdlength);
var dv = new DataView(rdataAb);
// we need this information for this parser
var labelInfo = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' });
var cpcount = labelInfo.cpcount;
//var cpcount = labelInfo.cpcount;
var offset = labelInfo.byteLength;
var labels = labelInfo.labels;
//var labels = labelInfo.labels;
// Primary NS
record.name_server = labelInfo.name;
record.primary = labelInfo.name;
record.name_server = record.primary;
// TODO delete this commented out code after some testing
// (pretty sure it was unnecessary and it seemed to work on code with compression pointers just fine)
@ -52,18 +56,19 @@ exports.DNS_PARSER_TYPE_SOA = function (ab, packet, record) {
record.email_addr = unpackLabels(new Uint8Array(ab), record.rdstart + offset, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
}
*/
record.email_addr = unpackLabels(new Uint8Array(ab), record.rdstart + offset, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
record.admin = unpackLabels(new Uint8Array(ab), record.rdstart + offset, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
record.email_addr = record.admin;
// Serial Number
record.sn = dv.getUint32(dv.byteLength - 20, false);
record.serial = record.sn = dv.getUint32(dv.byteLength - 20, false);
// Refresh Interval
record.ref = dv.getUint32(dv.byteLength - 16, false);
record.refresh = record.ref = dv.getUint32(dv.byteLength - 16, false);
// Retry Interval
record.ret = dv.getUint32(dv.byteLength - 12, false);
record.retry = record.ret = dv.getUint32(dv.byteLength - 12, false);
// Expiration Limit
record.ex = dv.getUint32(dv.byteLength - 8, false);
record.expiration = record.ex = dv.getUint32(dv.byteLength - 8, false);
// Minimum TTL
record.nx = dv.getUint32(dv.byteLength - 4, false);
record.minimum = record.nx = dv.getUint32(dv.byteLength - 4, false);
return record;
};