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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /** | ||
| * @author c65722 [] | ||
| * @copyright Crown Copyright 2024 | ||
| * @license Apache-2.0 | ||
| */ | ||
|
|
||
| import Operation from "../Operation.mjs"; | ||
| import OperationError from "../errors/OperationError.mjs"; | ||
| import Stream from "../lib/Stream.mjs"; | ||
|
|
||
| /** | ||
| * Strip IPv4 header operation | ||
| */ | ||
| class StripIPv4Header extends Operation { | ||
|
|
||
| /** | ||
| * StripIPv4Header constructor | ||
| */ | ||
| constructor() { | ||
| super(); | ||
|
|
||
| this.name = "Strip IPv4 header"; | ||
| this.module = "Default"; | ||
| this.description = "Strips the IPv4 header from an IPv4 packet, outputting the payload."; | ||
| this.infoURL = "https://wikipedia.org/wiki/IPv4"; | ||
| this.inputType = "ArrayBuffer"; | ||
| this.outputType = "ArrayBuffer"; | ||
| this.args = []; | ||
| } | ||
|
|
||
| /** | ||
| * @param {ArrayBuffer} input | ||
| * @param {Object[]} args | ||
| * @returns {ArrayBuffer} | ||
| */ | ||
| run(input, args) { | ||
| const MIN_HEADER_LEN = 20; | ||
|
|
||
| const s = new Stream(new Uint8Array(input)); | ||
| if (s.length < MIN_HEADER_LEN) { | ||
| throw new OperationError("Input length is less than minimum IPv4 header length"); | ||
| } | ||
|
|
||
| const ihl = s.readInt(1) & 0x0f; | ||
| const dataOffsetBytes = ihl * 4; | ||
| if (s.length < dataOffsetBytes) { | ||
| throw new OperationError("Input length is less than IHL"); | ||
| } | ||
|
|
||
| s.moveTo(dataOffsetBytes); | ||
|
|
||
| return s.getBytes().buffer; | ||
| } | ||
|
|
||
| } | ||
|
|
||
| export default StripIPv4Header; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /** | ||
| * Strip IPv4 header tests. | ||
| * | ||
| * @author c65722 [] | ||
| * @copyright Crown Copyright 2024 | ||
| * @license Apache-2.0 | ||
| */ | ||
|
|
||
| import TestRegister from "../../lib/TestRegister.mjs"; | ||
|
|
||
| TestRegister.addTests([ | ||
| { | ||
| name: "Strip IPv4 header: No options, No payload", | ||
| input: "450000140005400080060000c0a80001c0a80002", | ||
| expectedOutput: "", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| name: "Strip IPv4 header: No options, Payload", | ||
| input: "450000140005400080060000c0a80001c0a80002ffffffffffffffff", | ||
| expectedOutput: "ffffffffffffffff", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| name: "Strip IPv4 header: Options, No payload", | ||
| input: "460000140005400080060000c0a80001c0a8000207000000", | ||
| expectedOutput: "", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| name: "Strip IPv4 header: Options, Payload", | ||
| input: "460000140005400080060000c0a80001c0a8000207000000ffffffffffffffff", | ||
| expectedOutput: "ffffffffffffffff", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| name: "Strip IPv4 header: Input length lesss than minimum header length", | ||
| input: "450000140005400080060000c0a80001c0a800", | ||
| expectedOutput: "Input length is less than minimum IPv4 header length", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| name: "Strip IPv4 header: Input length less than IHL", | ||
| input: "460000140005400080060000c0a80001c0a80000", | ||
| expectedOutput: "Input length is less than IHL", | ||
| recipeConfig: [ | ||
| { | ||
| op: "From Hex", | ||
| args: ["None"] | ||
| }, | ||
| { | ||
| op: "Strip IPv4 header", | ||
| args: [], | ||
| }, | ||
| { | ||
| op: "To Hex", | ||
| args: ["None", 0] | ||
| } | ||
| ] | ||
| } | ||
| ]); |
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