105 lines
3.5 KiB
JavaScript
105 lines
3.5 KiB
JavaScript
(function (exports) {
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'use strict';
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// http://www.zytrax.com/books/dns/ch8/soa.html
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// https://github.com/tjfontaine/node-dns#resourcerecord
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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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exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
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function notNumber(n) {
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return 'number' !== typeof n || isNaN(n);
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}
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if (!record.primary && !record.name_server) {
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throw new Error("no name server for SOA record");
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}
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if (!record.admin && !record.email_addr) {
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throw new Error("ne email address for SOA record");
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}
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if (notNumber(record.serial) && notNumber(record.sn)) {
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throw new Error("no serial number for SOA record");
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}
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if (notNumber(record.refresh) && notNumber(record.ref)) {
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throw new Error("no refresh for SOA record");
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}
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if (notNumber(record.retry) && notNumber(record.ret)) {
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throw new Error("no update retry for SOA record");
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}
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if (notNumber(record.expiration) && notNumber(record.ex)) {
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throw new Error("no expiry for SOA record");
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}
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if (notNumber(record.minimum) && notNumber(record.nx)) {
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throw new Error("no nxdomain for SOA record");
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}
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var soaLen = 20; // take into account sn, ref, ret, ex, and nx
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// (32-bits each. 4Bytes * 5 = 20)
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var rdLenIndex = total;
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total += 2; // Save space for RDLENGTH
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//console.log('record.name_server', 1 + record.name_server.length, record.name_server);
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// pack name_server which is a sequence of labels
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(record.primary || record.name_server).split('.').forEach(function (label) {
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soaLen += (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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// must be terminated by null when not using write null
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dv.setUint8(total, 0, false);
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total += 1;
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soaLen += 1;
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//console.log('record.email_addr', 1 + record.email_addr.length, record.email_addr);
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// pack email address which is a sequence of labels
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(record.admin || record.email_addr).split('.').forEach(function (label) {
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soaLen += 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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// must be terminated by null when not using write null
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dv.setUint8(total, 0, false);
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total += 1;
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soaLen += 1;
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// pack all 32-bit values
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dv.setUint32(total, parseInt(record.serial || record.sn, 10), false);
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total+=4;
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dv.setUint32(total, parseInt(record.refresh || record.ref, 10), false);
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total+=4;
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dv.setUint32(total, parseInt(record.retry || record.ret, 10), false);
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total+=4;
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dv.setUint32(total, parseInt(record.expiration || record.ex, 10), false);
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total+=4;
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dv.setUint32(total, parseInt(record.minimum || record.nx, 10), false);
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total+=4;
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// RDLENGTH
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//console.log('rdAt', rdLenIndex);
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//console.log('soaLen (lables + 2 + 20)', soaLen);
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dv.setUint16(rdLenIndex, soaLen, false);
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return total;
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};
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}('undefined' !== typeof window ? window : exports));
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