dns-suite.js/parser/type.caa.js

58 lines
1.7 KiB
JavaScript

(function (exports) {
'use strict';
// RFC 6844 https://tools.ietf.org/html/rfc6844#section-3
// https://support.dnsimple.com/articles/caa-record/
// A Certification Authority Authorization (CAA) record is used to specify which
// certificate authorities (CAs) are allowed to issue certificates for a domain.
// Value Meaning/Use
//
// Flag An unsigned integer between 0-255.
// It is currently used to represent the critical flag, that has a
// specific meaning per RFC 6844
// Tag An ASCII string that represents the identifier of the property
// represented by the record.
// Value The value associated with the tag.
// The RFC currently defines 3 available tags:
//
// - issue: explicity authorizes a single certificate authority to issue a
// certificate (any type) for the hostname.
// - issuewild: explicity authorizes a single certificate authority to issue a
// wildcard certificate (and only wildcard) for the hostname.
// - iodef: specifies an URL to which a certificate authority may report
// policy violations.
exports.DNS_PARSER_TYPE_CAA = function (ab, packet, record) {
var data = new Uint8Array(ab);
var i = record.rdstart;
var flag = data[i];
var mid = data[i + 1];
i += 2;
mid += i;
var end = record.rdstart + record.rdlength;
var tag = '';
var value = '';
while (i < mid) {
tag += String.fromCharCode(data[i]);
i += 1;
}
while (i < end) {
value += String.fromCharCode(data[i]);
i += 1;
}
record.flag = flag;
record.tag = tag;
record.value = value;
return record;
};
}('undefined' !== typeof window ? window : exports));