67 lines
3.0 KiB
JavaScript
67 lines
3.0 KiB
JavaScript
(function (exports) {
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'use strict';
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// Value Meaning/Use
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// Primary NS Variable length. The name of the Primary Master for the domain. May be a label, pointer, or any combination
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// Admin MB Variable length. The administrator's mailbox. May be a label, pointer, or any combination
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// Serial Number Unsigned 32-bit integer
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// Refresh Interval Unsigned 32-bit integer
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// Retry Interval Unsigned 32-bit integer
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// Expiration Limit Unsigned 32-bit integer
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// Minimum TTL Unsigned 32-bit integer
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var unpackLabels = exports.DNS_UNPACK_LABELS || require('../dns.unpack-labels.js').DNS_UNPACK_LABELS;
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exports.DNS_PARSER_TYPE_SOA = function (ab, packet, record) {
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var rdataAb = ab.slice(record.rdstart, record.rdstart + record.rdlength);
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var dv = new DataView(rdataAb);
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// we need this information for this parser
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var cpcount = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).cpcount;
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var offset = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).byteLength;
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var labels = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).labels;
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// Primary NS
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record.name_server = unpackLabels(new Uint8Array(ab), record.rdstart, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
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// if there exists compression pointers in the rdata
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if (cpcount > 0){
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// do something awesome with compression pointers to get the email address
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// I need the length of all the data before the email address starts.
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// if there are compression pointers then there will be a byte to indicate the length of each label, the label,
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// then there will be a compression pointer to grab the longest label.
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var start = 2; // start or email_addr. take into account compression pointer and address length
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for(var i = 0; i < labels.length; i++){
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// increase start by the label length. the +1 is to take into account the next label size byte
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start = start + labels[i].length + 1;
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// check for cpcount. 2 counts behind
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if(parseInt(dv.getUint8(start - 2), 10) === 192){
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record.email_addr = unpackLabels(new Uint8Array(ab), record.rdstart + start ,{ byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
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}
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}
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} // if there are no compression pointers, we can get the email address directly from the offset
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else {
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record.email_addr = unpackLabels(new Uint8Array(ab), record.rdstart + offset, { byteLength: 0, cpcount: 0, labels: [], name: '' }).name;
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}
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// Serial Number
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record.sn = dv.getUint32(dv.byteLength - 20, false);
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// Refresh Interval
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record.ref = dv.getUint32(dv.byteLength - 16, false);
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// Retry Interval
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record.ret = dv.getUint32(dv.byteLength - 12, false);
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// Expiration Limit
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record.ex = dv.getUint32(dv.byteLength - 8, false);
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// Minimum TTL
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record.nx = dv.getUint32(dv.byteLength - 4, false);
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return record;
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};
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}('undefined' !== typeof window ? window : exports));
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