42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
(function (exports) {
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'use strict';
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// An 'MX' record is a 32-bit value representing the IP address
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exports.DNS_PACKER_TYPE_MX = function (ab, dv, total, record) {
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if (!record.exchange) {
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throw new Error("no exchange for MX record");
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}
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if (!record.priority) {
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// TODO: Check that number is in range 1-64k
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throw new Error("no priority for MX record");
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}
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var mxLen = 2; // 16-bit priority plus label sequence
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var rdLenIndex = total;
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total += 2; // The space for RDLENGTH is reserved now and set below
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dv.setUint16(total, parseInt(record.priority, 10), false);
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total += 2;
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// RDATA
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// 16-bit priority and a sequence of labels as the exchange
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record.exchange.split('.').forEach(function (label) {
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mxLen += 1 + label.length;
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dv.setUint8(total, label.length, false);
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total += 1;
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label.split('').forEach(function (ch) {
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dv.setUint8(total, ch.charCodeAt(0), false);
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total += 1;
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});
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});
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// RDLENGTH
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dv.setUint16(rdLenIndex, mxLen, false);
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return total;
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};
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}('undefined' !== typeof window ? window : exports));
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