mirror of https://github.com/gchq/CyberChef.git
90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
/**
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* @author h345983745 []
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import Stream from "../lib/Stream.mjs";
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import {toHexFast, fromHex} from "../lib/Hex.mjs";
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import {objToTable} from "../lib/Protocol.mjs";
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import Utils from "../Utils.mjs";
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import OperationError from "../errors/OperationError.mjs";
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/**
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* Parse UDP operation
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*/
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class ParseUDP extends Operation {
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/**
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* ParseUDP constructor
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*/
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constructor() {
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super();
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this.name = "Parse UDP";
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this.module = "Default";
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this.description = "Parses a UDP header and payload (if present).";
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this.infoURL = "https://wikipedia.org/wiki/User_Datagram_Protocol";
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this.inputType = "string";
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this.outputType = "json";
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this.presentType = "html";
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this.args = [
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{
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name: "Input format",
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type: "option",
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value: ["Hex", "Raw"]
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {Object}
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*/
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run(input, args) {
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const format = args[0];
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if (format === "Hex") {
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input = fromHex(input);
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} else if (format === "Raw") {
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input = Utils.strToArrayBuffer(input);
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} else {
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throw new OperationError("Unrecognised input format.");
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}
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const s = new Stream(new Uint8Array(input));
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if (s.length < 8) {
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throw new OperationError("Need 8 bytes for a UDP Header");
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}
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// Parse Header
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const UDPPacket = {
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"Source port": s.readInt(2),
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"Destination port": s.readInt(2),
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"Length": s.readInt(2),
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"Checksum": "0x" + toHexFast(s.getBytes(2))
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};
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// Parse data if present
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if (s.hasMore()) {
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UDPPacket.Data = "0x" + toHexFast(s.getBytes(UDPPacket.Length - 8));
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}
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return UDPPacket;
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}
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/**
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* Displays the UDP Packet in a tabular style
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* @param {Object} data
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* @returns {html}
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*/
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present(data) {
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return objToTable(data);
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}
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}
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export default ParseUDP;
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