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

100 lines
3.0 KiB
JavaScript

(function (exports) {
'use strict';
// http://www.zytrax.com/books/dns/ch8/soa.html
// 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
exports.DNS_PACKER_TYPE_SOA = function (ab, dv, total, record) {
if(!record.name_server){
throw new Error("no name server for SOA record");
}
if(!record.email_addr){
throw new Error("ne email address for SOA record");
}
if(!record.sn){
throw new Error("no serial number for SOA record");
}
if(!record.ref){
throw new Error("no refresh for SOA record");
}
if(!record.ret){
throw new Error("no update retry for SOA record");
}
if(!record.ex){
throw new Error("no expiry for SOA record");
}
if(!record.nx){
throw new Error("no nxdomain for SOA record");
}
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
console.log('record.name_server', 1 + record.name_server.length, record.name_server);
// pack name_server which is a sequence of labels
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;
console.log('record.email_addr', 1 + record.email_addr.length, record.email_addr);
// pack email address which is a sequence of labels
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
dv.setUint32(total, parseInt(record.sn, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ref, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ret, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.ex, 10), false);
total+=4;
dv.setUint32(total, parseInt(record.nx, 10), false);
total+=4;
// RDLENGTH
console.log('rdAt', rdLenIndex);
console.log('soaLen (lables + 2 + 20)', soaLen);
dv.setUint16(rdLenIndex, soaLen, false);
return total;
};
}('undefined' !== typeof window ? window : exports));