node-intellicenter
Version:
NodeJS library for communicating with a Pentair IntelliCenter controller
169 lines • 5.24 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ARecord = exports.SrvRecord = exports.TxtRecord = exports.PtrRecord = exports.Record = exports.Question = exports.TypeA = exports.TypeSrv = exports.TypePtr = exports.TypeTxt = void 0;
exports.ipToString = ipToString;
exports.GetDNSQuestion = GetDNSQuestion;
exports.GetDNSAnswer = GetDNSAnswer;
exports.TypeTxt = 16;
exports.TypePtr = 12;
exports.TypeSrv = 33;
exports.TypeA = 1;
class Question {
name = "";
type = 0;
class = 0;
endOffset = 0;
}
exports.Question = Question;
class Record {
type = 0;
ttlSeconds = 0;
name = "";
endOffset = -1;
}
exports.Record = Record;
class PtrRecord extends Record {
domain = "";
}
exports.PtrRecord = PtrRecord;
class TxtRecord extends Record {
text = "";
}
exports.TxtRecord = TxtRecord;
class SrvRecord extends Record {
priority = 0;
weight = 0;
port = 0;
target = "";
}
exports.SrvRecord = SrvRecord;
class ARecord extends Record {
address = 0;
get addressStr() {
return ipToString(this.address);
}
}
exports.ARecord = ARecord;
function ipToString(ip) {
const o1 = (ip >> 24) & 0xff;
const o2 = (ip >> 16) & 0xff;
const o3 = (ip >> 8) & 0xff;
const o4 = (ip >> 0) & 0xff;
const addressStr = `${o1.toString()}.${o2.toString()}.${o3.toString()}.${o4.toString()}`;
return addressStr;
}
class dnsAnswerParseResult {
name = "";
endOffset = 0;
}
function parseDnsName(msg, startOffset) {
const result = new dnsAnswerParseResult();
let offset = startOffset;
while (offset < msg.length) {
const nextByte = msg.readUInt8(offset);
if (nextByte === 0) {
offset++;
break;
}
const pointerMask = (1 << 6) | (1 << 7);
if ((nextByte & pointerMask) === pointerMask) {
offset++;
const pointerOffset = msg.readUInt8(offset);
offset++;
const nestedResult = parseDnsName(msg, pointerOffset);
if (result.name.length > 0 && nestedResult.name.length > 0) {
result.name += ".";
}
result.name += nestedResult.name;
break;
}
offset++;
const segment = msg.toString("ascii", offset, offset + nextByte);
offset += nextByte;
if (result.name.length > 0 && segment.length > 0) {
result.name += ".";
}
result.name += segment;
}
result.endOffset = offset;
return result;
}
function GetDNSQuestion(msg, startOffset) {
let offset = startOffset;
const parsedResult = parseDnsName(msg, offset);
offset = parsedResult.endOffset;
const type = msg.readUInt16BE(offset);
offset += 2;
const cls = msg.readUInt16BE(offset);
offset += 2;
const ret = new Question();
ret.name = parsedResult.name;
ret.type = type;
ret.class = cls;
ret.endOffset = offset;
return ret;
}
function GetDNSAnswer(msg, startOffset) {
let offset = startOffset;
const parsedResult = parseDnsName(msg, offset);
offset = parsedResult.endOffset;
const type = msg.readUInt16BE(offset);
offset += 2;
offset += 2; // don't care about "class" of answer
const ttlSeconds = msg.readUInt32BE(offset);
offset += 4;
const rDataLength = msg.readUInt16BE(offset);
offset += 2;
switch (type) {
case exports.TypePtr: {
const domainResult = parseDnsName(msg, offset);
const ret = new PtrRecord();
ret.type = type;
ret.ttlSeconds = ttlSeconds;
ret.name = parsedResult.name;
ret.endOffset = offset + rDataLength;
ret.domain = domainResult.name;
return ret;
}
case exports.TypeTxt: {
const textResult = parseDnsName(msg, offset);
const ret = new TxtRecord();
ret.type = type;
ret.ttlSeconds = ttlSeconds;
ret.name = parsedResult.name;
ret.endOffset = offset + rDataLength;
ret.text = textResult.name;
return ret;
}
case exports.TypeSrv: {
const priority = msg.readUInt16BE(offset);
const weight = msg.readUInt16BE(offset + 2);
const port = msg.readUInt16BE(offset + 4);
const targetResult = parseDnsName(msg, offset + 6);
const ret = new SrvRecord();
ret.type = type;
ret.ttlSeconds = ttlSeconds;
ret.name = parsedResult.name;
ret.endOffset = offset + rDataLength;
ret.priority = priority;
ret.weight = weight;
ret.port = port;
ret.target = targetResult.name;
return ret;
}
case exports.TypeA: {
const address = msg.readUInt32BE(offset);
const ret = new ARecord();
ret.type = type;
ret.ttlSeconds = ttlSeconds;
ret.name = parsedResult.name;
ret.endOffset = offset + rDataLength;
ret.address = address;
return ret;
}
default:
break;
}
return undefined;
}
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