dns-suite.js/packer/type.soa.js

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(function (exports) {
'use strict';
// http://www.zytrax.com/books/dns/ch8/soa.html
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// 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
// Admin MB Variable length. The administrator's mailbox. May be a label, pointer, or any combination
// Serial Number Unsigned 32-bit integer
// Refresh Interval Unsigned 32-bit integer
// Retry Interval Unsigned 32-bit integer
// Expiration Limit Unsigned 32-bit integer
// 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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}
if (!record.primary && !record.name_server) {
throw new Error("no name server for SOA record");
}
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if (!record.admin && !record.email_addr) {
throw new Error("ne email address for SOA record");
}
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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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if (notNumber(record.refresh) && notNumber(record.ref)) {
throw new Error("no refresh for SOA record");
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}
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if (notNumber(record.retry) && notNumber(record.ret)) {
throw new Error("no update retry for SOA record");
}
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if (notNumber(record.expiration) && notNumber(record.ex)) {
throw new Error("no expiry for SOA record");
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}
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if (notNumber(record.minimum) && notNumber(record.nx)) {
throw new Error("no nxdomain for SOA record");
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}
var soaLen = 20; // take into account sn, ref, ret, ex, and nx
// (32-bits each. 4Bytes * 5 = 20)
var rdLenIndex = total;
total += 2; // Save space for RDLENGTH
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//console.log('record.name_server', 1 + record.name_server.length, record.name_server);
// pack name_server which is a sequence of labels
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(record.primary || record.name_server).split('.').forEach(function (label) {
soaLen += (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;
});
});
// must be terminated by null when not using write null
dv.setUint8(total, 0, false);
total += 1;
soaLen += 1;
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//console.log('record.email_addr', 1 + record.email_addr.length, record.email_addr);
// pack email address which is a sequence of labels
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(record.admin || record.email_addr).split('.').forEach(function (label) {
soaLen += 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;
});
});
// must be terminated by null when not using write null
dv.setUint8(total, 0, false);
total += 1;
soaLen += 1;
// pack all 32-bit values
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dv.setUint32(total, parseInt(record.serial || record.sn, 10), false);
total+=4;
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dv.setUint32(total, parseInt(record.refresh || record.ref, 10), false);
total+=4;
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dv.setUint32(total, parseInt(record.retry || record.ret, 10), false);
total+=4;
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dv.setUint32(total, parseInt(record.expiration || record.ex, 10), false);
total+=4;
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dv.setUint32(total, parseInt(record.minimum || record.nx, 10), false);
total+=4;
// RDLENGTH
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//console.log('rdAt', rdLenIndex);
//console.log('soaLen (lables + 2 + 20)', soaLen);
dv.setUint16(rdLenIndex, soaLen, false);
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return total;
};
}('undefined' !== typeof window ? window : exports));