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