first commit.

.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+Thumbs.db
+.idea/
+
+*.js
+node_modules/
+wz/

README.md

@@ -0,0 +1,26 @@
+# tssocks5
+SOCKS v5 protocol implement by Typescript
+
+### Build
+```
+$ npm build
+```
+
+# Features
+- [x] Socks5 server
+- [x] Support IPv6
+- [x] Support Connect command
+- [x] Support DNS query cache
+- [ ] Support Username/Password authentication
+- [ ] Support Bind command
+- [ ] Support Udp Associate
+- [ ] Socks5 client
+
+
+
+## reference:
+* [Understand the working process of socks5 protocol and protocol details](https://wiyi.org/socks5-protocol-in-deep.html)
+* [Typescript in 5 minutes](https://www.tslang.cn/docs/handbook/typescript-in-5-minutes.html)
+
+## License
+Licensed under The MIT License

package-lock.json

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+        "rechoir": "^0.6.2"
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+    },
+    "typescript": {
+      "version": "4.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.9.3.tgz",
+      "integrity": "sha512-CIfGzTelbKNEnLpLdGFgdyKhG23CKdKgQPOBc+OUNrkJ2vr+KSzsSV5kq5iWhEQbok+quxgGzrAtGWCyU7tHnA==",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ=="
+    }
+  }
+}

package.json

@@ -0,0 +1,22 @@
+{
+  "name": "Typescript socks5",
+  "version": "1.0.0",
+  "description": "Typescript implement socks5 server and client",
+  "type": "module",
+  "module": "es6",
+  "scripts": {
+    "build": "npm install && npx tsc -p tsconfig.json"
+  },
+  "keywords": ["socks5", "typescript"],
+  "author": "Huazai",
+  "license": "MIT",
+  "dependencies": {
+    "dns-sync": "^0.2.1",
+    "ipaddr.js": "^2.0.1",
+    "mem-cache": "^0.0.5"
+  },
+  "devDependencies": {
+    "@types/node": "^18.11.9",
+    "typescript": "^4.9.3"
+  }
+}

src/lib/command.ts

@@ -0,0 +1,115 @@
+import {AddressType, CommandReplyType, CommandType} from "./constants.js";
+import ipaddr from 'ipaddr.js';
+
+export class Command {
+    public version: number;
+    public commandType: CommandType;
+    public addressType: AddressType;
+    public host: string;
+    public port: number;
+
+    constructor(chunk: Buffer) {
+        // console.log(inspect(chunk));
+        this.version = chunk.readUint8(0);
+        this.commandType = chunk.readUint8(1) as CommandType;
+        this.addressType = chunk.readUint8(3) as AddressType;
+
+        [this.host, this.port] = this.parseAddress(chunk);
+    }
+
+    private parseAddress(chunk: Buffer):[string, number] {
+        let address = [], port;
+        switch (this.addressType) {
+            case AddressType.IPv4:
+                address.push(chunk.readUint8(4).toString());
+                address.push(chunk.readUint8(5).toString());
+                address.push(chunk.readUint8(6).toString());
+                address.push(chunk.readUint8(7).toString());
+                port = chunk.readUInt16BE(8);
+                return [address.join('.'), port];
+            case AddressType.Domain:
+                const domainLength: number = chunk.readUint8(4);
+                let i:number;
+                for(i = 5; i < 5 + domainLength; i++) {
+                    address.push(String.fromCharCode(chunk.readUint8(i)));
+                }
+                port = chunk.readUInt16BE(i);
+                return [address.join(''), port];
+            case AddressType.IPv6:
+                let byteArray: number[] = [];
+                for(let i = 4; i < 20; i++) {
+                    byteArray.push(chunk.readUint8(i));
+                }
+                const ipv6Addr = ipaddr.fromByteArray(byteArray);
+                port = chunk.readUInt16BE(20);
+                return [ipv6Addr.toString(), port];
+            default:
+                break;
+        }
+
+        return ['', 0];
+    }
+}
+
+export class CommandReply {
+    private bufferLength:number = -1;
+    constructor(
+        private commandReplyType: CommandReplyType,
+        private addressType: AddressType,
+        private host: string,
+        private port: number
+    ) {
+        switch (this.addressType) {
+            case AddressType.IPv4:
+                this.bufferLength = 10;
+                break;
+            case AddressType.Domain:
+                this.bufferLength = 7 + this.host.length;
+                break;
+            case AddressType.IPv6:
+                this.bufferLength = 22;
+                break;
+        }
+    }
+
+    public generateBuffer(): Buffer {
+        const chunk = Buffer.alloc(this.bufferLength);
+        chunk.writeUint8(5, 0);
+        chunk.writeUint8(this.commandReplyType.valueOf(), 1);
+        chunk.writeUint8(0, 2);
+        chunk.writeUint8(this.addressType.valueOf(), 3);
+        const nextOffset: number = this.Host2Buffer(chunk, 4);
+        chunk.writeUInt16BE(this.port, nextOffset);
+
+        return chunk;
+    }
+
+    private Host2Buffer(chunk: Buffer, offset: number): number {
+        let nextOffset: number = -1;
+        switch (this.addressType) {
+            case AddressType.IPv4:
+                this.host.split('.').forEach((seg: string) => {
+                    chunk.writeUint8(Number.parseInt(seg), offset++);
+                });
+                nextOffset = 8;
+                break;
+            case AddressType.Domain:
+                chunk.writeUint8(this.host.length, 4);
+                offset += 1;
+                [...this.host].forEach((c, i) => {
+                   chunk.writeUint8(this.host.charCodeAt(i), offset++);
+                });
+                nextOffset = 4 + 1 + this.host.length;
+                break;
+            case AddressType.IPv6:
+                const bytes = ipaddr.parse(this.host).toByteArray();
+                bytes.map((byte) => {
+                    chunk.writeUint8(byte, offset++);
+                });
+                nextOffset = 20;
+                break;
+        }
+
+        return nextOffset;
+    }
+}

src/lib/constants.ts

@@ -0,0 +1,41 @@
+export enum CommandType {
+    Connect = 0x01,
+    Bind = 0x02,
+    UdpAssociate = 0x03
+}
+
+export enum AddressType {
+    IPv4 = 0x01,
+    Domain = 0x03,
+    IPv6 = 0x04
+}
+
+export enum ClientSocketState {
+    connected = 0x00,
+    Handshaking = 0x01,
+    Authenticate = 0x02,
+    CmdProcessing = 0x03,
+    DataTransmission = 0x04
+}
+
+export enum AuthMethodType {
+    NoAuth = 0x00,
+    GSSAPI = 0x01,
+    Basic = 0x02, // username/password
+    // 0x03 - 0x7F IANA assigned
+    // 0x80 - 0xFE private methods
+    Invalid = 0xFF
+}
+
+export enum CommandReplyType {
+    Succeeded = 0x00,
+    GeneralFailure = 0x01,
+    ConnectionDisallowedByRuleset = 0x02,
+    NetworkUnreachable = 0x03,
+    HostUnreachable = 0x04,
+    ConnectionRefused = 0x05,
+    TTLExpired = 0x06,
+    CommandNotSupported = 0x07,
+    AddressTypeNotSupported = 0x08
+    // 0x09 - 0xFF not assigned
+}

src/lib/server.ts

@@ -0,0 +1,201 @@
+import {AddressType, AuthMethodType, ClientSocketState, CommandReplyType, CommandType} from "./constants.js";
+import {Command, CommandReply} from './command.js'
+import {EventEmitter} from 'events';
+import * as net from 'net';
+import {inspect} from "util";
+// @ts-ignore
+import dnsSync from 'dns-sync';
+// @ts-ignore
+import Memcache from 'mem-cache';
+
+export class Socks5Server extends EventEmitter{
+    private tcpServer: net.Server;
+    private acceptAuthMethod: AuthMethodType;
+    private mcache: Memcache;
+
+    constructor(port: number, hostname: string) {
+        super();
+        this.acceptAuthMethod = AuthMethodType.NoAuth; // only NoAuth
+        this.mcache = new Memcache();
+
+        this.tcpServer = net.createServer((clientSocket:net.Socket) => {
+            let clientStats = ClientSocketState.connected;
+            console.log(`Connect from ${clientSocket.remoteAddress}:${clientSocket.remotePort}`);
+
+            clientSocket.on('data', (data) => {
+                console.log(`client on data: ${inspect(data)}`);
+                switch (clientStats) {
+                    case ClientSocketState.connected:
+                        clientStats = ClientSocketState.Handshaking;
+                        if (!this.handshake(clientSocket, data)) {
+                            clientSocket.end();
+                        } else {
+                            if (this.acceptAuthMethod == AuthMethodType.NoAuth) {
+                                clientStats = ClientSocketState.CmdProcessing;
+                            } else {
+                                // TODO other AuthMethodType
+                            }
+                        }
+                        break;
+                    case ClientSocketState.CmdProcessing:
+                        if (!this.processCmd(clientSocket, data)) {
+                            clientSocket.end();
+                        } else {
+                            clientStats = ClientSocketState.DataTransmission;
+                        }
+                        break;
+                    case ClientSocketState.DataTransmission:
+                        console.log(`Data transfer begins`);
+                        break;
+                    default:
+                        console.log(`UnHandle data: ${inspect(data)}`);
+                        break;
+                }
+            });
+
+            clientSocket.on('close', () => {
+                console.log(`client ${clientSocket.remoteAddress}:${clientSocket.remotePort} closed`);
+            });
+
+            clientSocket.on('error', (error:Error) => {
+                switch (error.message) {
+                    case 'read ECONNRESET':
+                        break;
+                    default:
+                        console.error(error.message);
+                        break;
+                }
+            });
+        });
+
+        this.tcpServer.listen(port, hostname);
+
+        this.tcpServer.on('listening', () => {
+            console.log('Socks5 server started...');
+        });
+    }
+
+    private handshake(socket: net.Socket, chunk: Buffer): boolean {
+        const version: number = chunk.readUint8(0);
+        const numOfMethods = chunk.readUint8(1);
+        const methods = [];
+
+        for(let i = 0; i < numOfMethods; i++) {
+            methods.push(chunk.readUint8(i + 2));
+        }
+
+        // console.log(`client version ${version} number of methods ${numOfMethods}`);
+        // console.log(`client accept methods: ${inspect(methods)}`);
+
+        const buffer = Buffer.alloc(2);
+        buffer.writeUint8(5, 0);
+        if(methods.indexOf(this.acceptAuthMethod) !== -1) {
+            buffer.writeUint8(this.acceptAuthMethod, 1);
+            socket.write(buffer);
+            return true;
+        } else {
+            buffer.writeUint8(0xFF, 1);
+            socket.write(buffer);
+            return false;
+        }
+    }
+
+    private processCmd(socket: net.Socket, chunk: Buffer): Boolean {
+        const cmd = new Command(chunk);
+        let readyToConnectRemoteHost:string = cmd.host,
+            readyToConnectRemotePort:number = cmd.port;
+        let commandReply: CommandReply;
+        let isCommandSucceeded: boolean = true;
+
+        // error command type
+        if (!Object.values(CommandType).includes(cmd.commandType)) {
+            console.error(`Error command type [${cmd.commandType}] from ${socket.remoteAddress}:${socket.remotePort}`);
+            socket.end();
+        }
+
+        switch (cmd.addressType) {
+            case AddressType.Domain:
+                const dnsResolveRecord = this.dnsQuery(cmd.host);
+                // resole domain name & no record found
+                if (!dnsResolveRecord) {
+                    commandReply = new CommandReply(
+                        CommandReplyType.HostUnreachable,
+                        AddressType.Domain, cmd.host, cmd.port
+                    );
+                    isCommandSucceeded = false;
+                } else {
+                    readyToConnectRemoteHost = dnsResolveRecord;
+                }
+                break;
+            case AddressType.IPv4:
+                break;
+            case AddressType.IPv6:
+                break;
+            default:
+                commandReply = new CommandReply(
+                    CommandReplyType.AddressTypeNotSupported,
+                    cmd.addressType, cmd.host, cmd.port
+                );
+                isCommandSucceeded = false;
+        }
+
+        if (isCommandSucceeded) {
+            switch (cmd.commandType) {
+                case CommandType.Connect:
+                    // remove data event listeners
+                    socket.removeAllListeners('data');
+                    const remoteSocket: net.Socket = new net.Socket();
+                    remoteSocket.connect(readyToConnectRemotePort, readyToConnectRemoteHost, () => {
+                        const commandReply2: CommandReply = new CommandReply(
+                            CommandReplyType.Succeeded,
+                            cmd.addressType, readyToConnectRemoteHost, readyToConnectRemotePort
+                        );
+                        const replyBuffer: Buffer = commandReply2.generateBuffer();
+                        socket.write(replyBuffer);
+                        socket.pipe(remoteSocket);
+                        remoteSocket.pipe(socket);
+                    });
+                    remoteSocket.on('error', (error: Error) => {
+                        console.error(`RemoteSocket Error:${inspect(error)}`);
+                    });
+
+                    break;
+                case CommandType.Bind:
+                // TODO
+                case CommandType.UdpAssociate:
+                // TODO
+                default:
+                    commandReply = new CommandReply(
+                        CommandReplyType.CommandNotSupported,
+                        cmd.addressType, cmd.host, cmd.port
+                    );
+                    isCommandSucceeded = false;
+            }
+        }
+
+        // @ts-ignore
+        if (commandReply != undefined) {
+            const replyBuffer: Buffer = commandReply.generateBuffer();
+            console.log(inspect(replyBuffer));
+            socket.write(replyBuffer);
+        }
+        return isCommandSucceeded;
+    }
+
+    // query and cache dns lookup record for 60 * 10 seconds
+    private dnsQuery(domain: string): string {
+        const key = `D:${domain}`;
+        let value = this.mcache.get(key);
+        if (!value) {
+            value = dnsSync.resolve(domain);
+        }
+
+        if (value == null) {
+            return '';
+        } else {
+            this.mcache.set(key, value, 60 * 10);
+            return value;
+        }
+    }
+}
+

src/server_test.ts

@@ -0,0 +1,7 @@
+import {Socks5Server} from "./lib/server.js";
+
+process.on('uncaughtException', function (err) {
+    console.error(err);
+});
+
+const server = new Socks5Server(2211, 'localhost');

tsconfig.json

@@ -0,0 +1,106 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig to read more about this file */
+
+    /* Projects */
+    // "incremental": true,                              /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
+    // "composite": true,                                /* Enable constraints that allow a TypeScript project to be used with project references. */
+    // "tsBuildInfoFile": "./.tsbuildinfo",              /* Specify the path to .tsbuildinfo incremental compilation file. */
+    // "disableSourceOfProjectReferenceRedirect": true,  /* Disable preferring source files instead of declaration files when referencing composite projects. */
+    // "disableSolutionSearching": true,                 /* Opt a project out of multi-project reference checking when editing. */
+    // "disableReferencedProjectLoad": true,             /* Reduce the number of projects loaded automatically by TypeScript. */
+
+    /* Language and Environment */
+    "target": "es2016",                                  /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
+    // "lib": [],                                        /* Specify a set of bundled library declaration files that describe the target runtime environment. */
+    // "jsx": "preserve",                                /* Specify what JSX code is generated. */
+    // "experimentalDecorators": true,                   /* Enable experimental support for TC39 stage 2 draft decorators. */
+    // "emitDecoratorMetadata": true,                    /* Emit design-type metadata for decorated declarations in source files. */
+    // "jsxFactory": "",                                 /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
+    // "jsxFragmentFactory": "",                         /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
+    // "jsxImportSource": "",                            /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
+    // "reactNamespace": "",                             /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
+    // "noLib": true,                                    /* Disable including any library files, including the default lib.d.ts. */
+    // "useDefineForClassFields": true,                  /* Emit ECMAScript-standard-compliant class fields. */
+    // "moduleDetection": "auto",                        /* Control what method is used to detect module-format JS files. */
+
+    /* Modules */
+    "module": "es6",                                /* Specify what module code is generated. */
+    // "rootDir": "./",                                  /* Specify the root folder within your source files. */
+    "moduleResolution": "node",                       /* Specify how TypeScript looks up a file from a given module specifier. */
+    // "baseUrl": "./",                                  /* Specify the base directory to resolve non-relative module names. */
+    // "paths": {},                                      /* Specify a set of entries that re-map imports to additional lookup locations. */
+    // "rootDirs": [],                                   /* Allow multiple folders to be treated as one when resolving modules. */
+    // "typeRoots": [],                                  /* Specify multiple folders that act like './node_modules/@types'. */
+    // "types": [],                                      /* Specify type package names to be included without being referenced in a source file. */
+    // "allowUmdGlobalAccess": true,                     /* Allow accessing UMD globals from modules. */
+    // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */
+    // "resolveJsonModule": true,                        /* Enable importing .json files. */
+    // "noResolve": true,                                /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
+
+    /* JavaScript Support */
+    // "allowJs": true,                                  /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
+    // "checkJs": true,                                  /* Enable error reporting in type-checked JavaScript files. */
+    // "maxNodeModuleJsDepth": 1,                        /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
+
+    /* Emit */
+    // "declaration": true,                              /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
+    // "declarationMap": true,                           /* Create sourcemaps for d.ts files. */
+    // "emitDeclarationOnly": true,                      /* Only output d.ts files and not JavaScript files. */
+    // "sourceMap": true,                                /* Create source map files for emitted JavaScript files. */
+    // "outFile": "./",                                  /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+    "outDir": "",                                   /* Specify an output folder for all emitted files. */
+    // "removeComments": true,                           /* Disable emitting comments. */
+    // "noEmit": true,                                   /* Disable emitting files from a compilation. */
+    // "importHelpers": true,                            /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
+    // "importsNotUsedAsValues": "remove",               /* Specify emit/checking behavior for imports that are only used for types. */
+    // "downlevelIteration": true,                       /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
+    // "sourceRoot": "",                                 /* Specify the root path for debuggers to find the reference source code. */
+    // "mapRoot": "",                                    /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,                          /* Include sourcemap files inside the emitted JavaScript. */
+    // "inlineSources": true,                            /* Include source code in the sourcemaps inside the emitted JavaScript. */
+    // "emitBOM": true,                                  /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
+    // "newLine": "crlf",                                /* Set the newline character for emitting files. */
+    // "stripInternal": true,                            /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
+    // "noEmitHelpers": true,                            /* Disable generating custom helper functions like '__extends' in compiled output. */
+    // "noEmitOnError": true,                            /* Disable emitting files if any type checking errors are reported. */
+    // "preserveConstEnums": true,                       /* Disable erasing 'const enum' declarations in generated code. */
+    // "declarationDir": "./",                           /* Specify the output directory for generated declaration files. */
+    // "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
+
+    /* Interop Constraints */
+    // "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+    // "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
+    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
+    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
+    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
+
+    /* Type Checking */
+    "strict": true,                                      /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                            /* Enable error reporting for expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,                         /* When type checking, take into account 'null' and 'undefined'. */
+    // "strictFunctionTypes": true,                      /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
+    // "strictBindCallApply": true,                      /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
+    // "strictPropertyInitialization": true,             /* Check for class properties that are declared but not set in the constructor. */
+    // "noImplicitThis": true,                           /* Enable error reporting when 'this' is given the type 'any'. */
+    // "useUnknownInCatchVariables": true,               /* Default catch clause variables as 'unknown' instead of 'any'. */
+    // "alwaysStrict": true,                             /* Ensure 'use strict' is always emitted. */
+    // "noUnusedLocals": true,                           /* Enable error reporting when local variables aren't read. */
+    // "noUnusedParameters": true,                       /* Raise an error when a function parameter isn't read. */
+    // "exactOptionalPropertyTypes": true,               /* Interpret optional property types as written, rather than adding 'undefined'. */
+    // "noImplicitReturns": true,                        /* Enable error reporting for codepaths that do not explicitly return in a function. */
+    // "noFallthroughCasesInSwitch": true,               /* Enable error reporting for fallthrough cases in switch statements. */
+    // "noUncheckedIndexedAccess": true,                 /* Add 'undefined' to a type when accessed using an index. */
+    // "noImplicitOverride": true,                       /* Ensure overriding members in derived classes are marked with an override modifier. */
+    // "noPropertyAccessFromIndexSignature": true,       /* Enforces using indexed accessors for keys declared using an indexed type. */
+    // "allowUnusedLabels": true,                        /* Disable error reporting for unused labels. */
+    // "allowUnreachableCode": true,                     /* Disable error reporting for unreachable code. */
+
+    /* Completeness */
+    // "skipDefaultLibCheck": true,                      /* Skip type checking .d.ts files that are included with TypeScript. */
+    "skipLibCheck": true                                 /* Skip type checking all .d.ts files. */
+  },
+  "include": [
+    "./src/"
+  ]
+}