# @serve.zone/dcrouter

![](https://code.foss.global/serve.zone/docs/raw/branch/main/dcrouter.png)

**dcrouter: A powerful traffic router designed to be the gateway for your datacenter.** 🚀

A comprehensive traffic routing solution that provides unified gateway capabilities for HTTP/HTTPS, TCP/SNI, email (SMTP), DNS protocols, and RADIUS authentication. Designed for enterprises requiring robust traffic management, automatic certificate provisioning, and enterprise-grade email infrastructure.

## Issue Reporting and Security

For reporting bugs, issues, or security vulnerabilities, please visit [community.foss.global/](https://community.foss.global/). This is the central community hub for all issue reporting. Developers who sign and comply with our contribution agreement and go through identification can also get a [code.foss.global/](https://code.foss.global/) account to submit Pull Requests directly.

## Table of Contents

- [Features](#features)
- [Installation](#installation)
- [Quick Start](#quick-start)
- [Architecture](#architecture)
- [Configuration](#configuration)
- [Socket-Handler Mode](#socket-handler-mode)
- [Email System](#email-system)
- [SmartProxy Routing](#smartproxy-routing)
- [RADIUS Server](#radius-server)
- [Storage System](#storage-system)
- [Security Features](#security-features)
- [OpsServer Dashboard](#opsserver-dashboard)
- [API Reference](#api-reference)
- [Examples](#examples)
- [Testing](#testing)
- [Troubleshooting](#troubleshooting)

## Features

### 🌐 **Universal Traffic Router**
- **HTTP/HTTPS routing** with pattern matching and virtual hosts
- **TCP/SNI proxy** for any protocol with TLS termination/passthrough
- **DNS server** with authoritative and dynamic record management
- **Multi-protocol support** on the same infrastructure

### 🔒 **Enterprise Security**
- **Automatic TLS certificates** via ACME with DNS-01 challenges
- **IP reputation checking** and real-time threat detection
- **Content scanning** for spam, viruses, and malicious content
- **Comprehensive security logging** with correlation tracking

### 📧 **Complete Email Infrastructure**
- **Multi-domain SMTP server** on standard ports (25, 587, 465)
- **Pattern-based email routing** with four processing modes (forward, process, deliver, reject)
- **DKIM, SPF, DMARC** authentication and verification
- **Enterprise deliverability** with IP warmup and reputation management
- **Bounce handling** with suppression lists

### 📡 **RADIUS Server**
- **MAC Authentication Bypass (MAB)** for network device authentication
- **VLAN assignment** based on MAC address or OUI patterns
- **RADIUS accounting** for session tracking and billing
- **OpsServer API integration** for real-time management

### ⚡ **High Performance**
- **Connection pooling** and efficient resource management
- **Load balancing** with automatic failover
- **Rate limiting** at multiple levels
- **Real-time metrics** and monitoring

### 💾 **Flexible Storage System**
- **Multiple storage backends**: filesystem, custom functions, or memory
- **Unified storage interface** for all components
- **Automatic data migration** between backends
- **Persistent configuration** for domains, routes, and security data

### 🖥️ **OpsServer Dashboard**
- **Web-based management interface** for real-time monitoring
- **JWT authentication** with secure admin access
- **Live statistics** for connections, email, DNS, and RADIUS
- **Configuration management** via TypedRequest API

## Installation

```bash
npm install @serve.zone/dcrouter --save
# or
pnpm add @serve.zone/dcrouter
```

### Prerequisites

- Node.js 18+ with ES modules support
- Valid domain with DNS control (for ACME certificates)
- Cloudflare API token (for DNS challenges)

## Quick Start

### Basic HTTP/HTTPS Router

```typescript
import { DcRouter } from '@serve.zone/dcrouter';

const router = new DcRouter({
  smartProxyConfig: {
    routes: [
      {
        name: 'web-service',
        match: { domains: ['example.com'], ports: [443] },
        action: {
          type: 'forward',
          targets: [{ host: '192.168.1.10', port: 8080 }],
          tls: { mode: 'terminate', certificate: 'auto' }
        }
      }
    ],
    acme: {
      email: 'admin@example.com',
      enabled: true,
      useProduction: true
    }
  }
});

await router.start();
console.log('DcRouter started successfully');
```

### Basic Email Router

```typescript
import { DcRouter } from '@serve.zone/dcrouter';

const router = new DcRouter({
  emailConfig: {
    ports: [25, 587, 465],
    hostname: 'mail.example.com',
    routes: [
      {
        name: 'local-mail',
        match: { recipients: '*@example.com' },
        action: {
          type: 'process',
          process: {
            scan: true,
            dkim: true,
            queue: 'normal'
          }
        }
      }
    ],
    tls: {
      keyPath: './certs/key.pem',
      certPath: './certs/cert.pem'
    }
  }
});

await router.start();
```

### With OpsServer Dashboard

```typescript
import { DcRouter } from '@serve.zone/dcrouter';

const router = new DcRouter({
  // Enable OpsServer for web dashboard
  opsServerConfig: {
    port: 3000,
    admin: {
      username: 'admin',
      password: 'your-secure-password'
    }
  },

  // Your routing configuration...
  smartProxyConfig: { /* ... */ },
  emailConfig: { /* ... */ }
});

await router.start();
// Dashboard available at http://localhost:3000
```

## Architecture

### System Overview

```mermaid
graph TB
    subgraph "External Traffic"
        HTTP[HTTP/HTTPS Clients]
        SMTP[SMTP Clients]
        TCP[TCP Clients]
        DNS[DNS Queries]
        RADIUS[RADIUS Clients]
    end

    subgraph "DcRouter Core"
        DcRouter[DcRouter Orchestrator]
        SmartProxy[SmartProxy Engine]
        EmailServer[Unified Email Server]
        DnsServer[DNS Server]
        RadiusServer[RADIUS Server]
        CertManager[Certificate Manager]
        OpsServer[OpsServer Dashboard]
    end

    subgraph "Backend Services"
        WebServices[Web Services]
        MailServers[Mail Servers]
        Databases[Databases]
        APIs[Internal APIs]
    end

    HTTP --> SmartProxy
    TCP --> SmartProxy
    SMTP --> EmailServer
    DNS --> DnsServer
    RADIUS --> RadiusServer

    DcRouter --> SmartProxy
    DcRouter --> EmailServer
    DcRouter --> DnsServer
    DcRouter --> RadiusServer
    DcRouter --> CertManager
    DcRouter --> OpsServer

    SmartProxy --> WebServices
    SmartProxy --> APIs
    EmailServer --> MailServers
    EmailServer --> Databases

    CertManager -.-> SmartProxy
    CertManager -.-> EmailServer
```

### Core Components

#### **DcRouter Orchestrator**
Central coordination engine that manages all services and provides unified configuration.

#### **SmartProxy Engine**
High-performance HTTP/HTTPS and TCP/SNI proxy with:
- Pattern-based routing
- TLS termination/passthrough
- Load balancing
- Connection pooling

#### **Unified Email Server**
Enterprise-grade SMTP server with:
- Multi-domain support
- Pattern-based routing
- Four processing modes (forward, process, deliver, reject)
- Complete authentication stack (DKIM, SPF, DMARC)

#### **DNS Server**
Authoritative DNS server with:
- Dynamic record management
- DNS-over-HTTPS (DoH) support
- ACME DNS-01 challenge handling

#### **RADIUS Server**
Network authentication server with:
- MAC Authentication Bypass (MAB)
- VLAN assignment
- Accounting support

#### **Certificate Manager**
Automatic TLS certificate provisioning via ACME with DNS-01 challenges.

#### **OpsServer Dashboard**
Web-based management interface with:
- JWT-secured API
- Real-time statistics
- Configuration management

## Configuration

### Complete Configuration Interface

```typescript
interface IDcRouterOptions {
  // SmartProxy configuration for HTTP/HTTPS/TCP routing
  smartProxyConfig?: {
    routes: IRouteConfig[];
    acme?: IAcmeConfig;
    allowSessionTicket?: boolean;
  };

  // Email system configuration
  emailConfig?: {
    ports: number[];
    hostname: string;
    domains?: IEmailDomainConfig[];  // Domain infrastructure setup
    routes: IEmailRoute[];           // Route-based email handling
    auth?: IAuthConfig;
    tls?: ITlsConfig;
    maxMessageSize?: number;
    rateLimits?: IRateLimitConfig;
    useSocketHandler?: boolean;      // Enable socket-handler mode (no port binding)
    defaults?: {                     // Global defaults for all domains
      dnsMode?: 'forward' | 'internal-dns' | 'external-dns';
      dkim?: IDkimConfig;
      rateLimits?: IRateLimitConfig;
    };
  };

  // DNS server configuration
  dnsServerConfig?: {
    port?: number;
    authoritative?: boolean;
    records?: IDnsRecord[];
  };

  // DNS domain for automatic DNS-over-HTTPS setup
  dnsDomain?: string;               // e.g., 'dns.example.com'

  // DNS nameserver domains (enables authoritative DNS)
  dnsNsDomains?: string[];          // e.g., ['ns1.example.com', 'ns2.example.com']

  // RADIUS server configuration
  radiusConfig?: {
    port?: number;
    secret: string;
    clients?: IRadiusClient[];
    macAuth?: IMacAuthConfig;
    vlanAssignment?: IVlanAssignment[];
  };

  // OpsServer configuration
  opsServerConfig?: {
    port?: number;
    admin: {
      username: string;
      password: string;
    };
  };

  // TLS and certificate configuration
  tls?: {
    contactEmail: string;
    domain: string;
  };

  // DNS challenge configuration
  dnsChallenge?: {
    cloudflareApiKey: string;
  };

  // Storage configuration
  storage?: {
    fsPath?: string;                  // Filesystem storage path
    readFunction?: (key: string) => Promise<string>;    // Custom read function
    writeFunction?: (key: string, value: string) => Promise<void>;  // Custom write function
  };
}
```

### Route Configuration

```typescript
interface IRouteConfig {
  name: string;
  priority?: number;
  match: {
    domains?: string[];
    ports?: number | number[] | { from: number; to: number }[];
  };
  action: {
    type: 'forward' | 'redirect' | 'serve';
    targets?: Array<{
      host: string;
      port: number | 'preserve' | ((context: any) => number);
    }>;
    tls?: {
      mode: 'terminate' | 'passthrough';
      certificate?: 'auto' | string;
    };
    security?: {
      ipAllowList?: string[];
      ipBlockList?: string[];
    };
  };
}
```

## Socket-Handler Mode

DcRouter supports an advanced socket-handler mode that eliminates internal port binding for both DNS and email services. Instead of services listening on internal ports, SmartProxy passes sockets directly to the services.

### DNS Socket-Handler

When `dnsDomain` is configured, DcRouter automatically:
- Sets up DNS server for UDP on port 53
- Creates SmartProxy routes for DNS-over-HTTPS (DoH) on the specified domain
- Uses socket-handler for HTTPS/DoH traffic (no HTTPS port binding)

```typescript
const router = new DcRouter({
  dnsDomain: 'dns.example.com',    // Enables DNS with DoH
  smartProxyConfig: {
    // DNS routes are automatically created
  }
});
```

This creates:
- UDP DNS service on port 53 (standard DNS queries)
- HTTPS routes for `dns.example.com/dns-query` and `dns.example.com/resolve`
- Automatic TLS certificates via Let's Encrypt

### Email Socket-Handler

When `useSocketHandler` is enabled in email config:
- Email server doesn't bind to any ports
- SmartProxy passes sockets directly to email handlers
- Reduces latency and resource usage

```typescript
const router = new DcRouter({
  emailConfig: {
    ports: [25, 587, 465],
    hostname: 'mail.example.com',
    useSocketHandler: true,         // Enable socket-handler mode
    routes: [/* email routes */]
  }
});
```

### Benefits of Socket-Handler Mode

1. **Performance**: Eliminates internal port forwarding overhead
2. **Security**: No exposed internal ports
3. **Resource Efficiency**: Fewer open ports and listeners
4. **Simplified Networking**: Direct socket passing
5. **Automatic Configuration**: Routes created automatically

### Traditional vs Socket-Handler Mode

**Traditional Mode (default):**
```
External Port → SmartProxy → Internal Port → Service
    25             →           10025          → Email
```

**Socket-Handler Mode:**
```
External Port → SmartProxy → Socket Handler → Service
    25             →         (direct socket)  → Email
```

## Email System

### Email Domain Configuration

DcRouter separates email infrastructure (which domains to handle) from routing logic (how to handle emails):

#### **DNS Modes**

**Forward Mode** - Simple mail forwarding without local DNS:
```typescript
{
  domain: 'forwarded.com',
  dnsMode: 'forward',
  dns: {
    forward: {
      skipDnsValidation: true,
      targetDomain: 'mail.target.com'
    }
  }
}
```

**Internal DNS Mode** - Use built-in DNS server (requires `dnsDomain` in DcRouter config):
```typescript
{
  domain: 'mail.example.com',
  dnsMode: 'internal-dns',
  dns: {
    internal: {
      mxPriority: 10,
      ttl: 3600
    }
  },
  dkim: {
    selector: 'mail2024',
    keySize: 2048,
    rotateKeys: true,
    rotationInterval: 90
  }
}
```

**External DNS Mode** - Use existing DNS infrastructure:
```typescript
{
  domain: 'mail.external.com',
  dnsMode: 'external-dns',
  dns: {
    external: {
      requiredRecords: ['MX', 'SPF', 'DKIM', 'DMARC']
    }
  },
  rateLimits: {
    inbound: {
      messagesPerMinute: 100,
      connectionsPerIp: 10
    }
  }
}
```

#### **DKIM Management**

DKIM is always enabled for all domains. Keys are automatically:
- Generated on first use
- Stored persistently via StorageManager
- Rotated based on configuration
- Cleaned up after grace period

### Email Route Actions

#### **Forward Action**
Routes emails to external SMTP servers.

```typescript
{
  name: 'forward-to-internal',
  match: { recipients: '*@company.com' },
  action: {
    type: 'forward',
    forward: {
      host: 'internal-mail.company.com',
      port: 25,
      auth: {
        username: 'relay-user',
        password: 'relay-pass'
      },
      addHeaders: {
        'X-Forwarded-By': 'dcrouter'
      }
    }
  }
}
```

#### **Process Action**
Full Mail Transfer Agent functionality with scanning and delivery queues.

```typescript
{
  name: 'process-notifications',
  match: { recipients: '*@notifications.company.com' },
  action: {
    type: 'process',
    process: {
      scan: true,
      dkim: true,
      queue: 'priority'
    }
  }
}
```

#### **Deliver Action**
Local delivery for mailbox storage.

```typescript
{
  name: 'deliver-local',
  match: { recipients: '*@marketing.company.com' },
  action: {
    type: 'deliver'
  }
}
```

#### **Reject Action**
Reject emails with custom SMTP responses.

```typescript
{
  name: 'reject-spam',
  match: {
    senders: '*@spam-domain.com',
    sizeRange: { min: 1000000 } // > 1MB
  },
  action: {
    type: 'reject',
    reject: {
      code: 550,
      message: 'Message rejected due to policy'
    }
  }
}
```

### Common Email Routing Patterns

#### **IP-Based Relay**
Allow internal networks to relay through the server:
```typescript
{
  name: 'office-relay',
  priority: 100,
  match: { clientIp: ['192.168.0.0/16', '10.0.0.0/8'] },
  action: {
    type: 'forward',
    forward: { host: 'internal-mail.company.com', port: 25 }
  }
}
```

#### **Domain-Based Routing**
Route different domains to different servers:
```typescript
{
  name: 'partner-domain',
  match: { recipients: '*@partner.com' },
  action: {
    type: 'forward',
    forward: { host: 'partner-mail.com', port: 587 }
  }
}
```

#### **Authentication-Based Processing**
Different handling for authenticated vs unauthenticated senders:
```typescript
{
  name: 'authenticated-users',
  match: { authenticated: true },
  action: {
    type: 'process',
    process: { scan: false, dkim: true, queue: 'priority' }
  }
},
{
  name: 'unauthenticated-reject',
  match: { authenticated: false },
  action: {
    type: 'reject',
    reject: { code: 550, message: 'Authentication required' }
  }
}
```

### Email Security Features

#### **Route Matching Patterns**

**Glob Pattern Matching**
```typescript
// Email address patterns
match: { recipients: '*@example.com' }        // All addresses at domain
match: { recipients: 'admin@*' }             // Admin at any domain
match: { senders: ['*@trusted.com', '*@partner.com'] } // Multiple patterns

// CIDR IP matching
match: { clientIp: '192.168.0.0/16' }        // Private subnet
match: { clientIp: ['10.0.0.0/8', '172.16.0.0/12'] } // Multiple ranges

// Header matching
match: {
  headers: {
    'X-Priority': 'high',
    'Subject': /urgent|emergency/i
  }
}

// Size and content matching
match: {
  sizeRange: { min: 1000, max: 5000000 },    // 1KB to 5MB
  hasAttachments: true,
  subject: /invoice|receipt/i
}
```

#### **Content Scanning**
```typescript
const scanners = [
  {
    type: 'spam',
    threshold: 5.0,
    action: 'tag',
    headers: ['X-Spam-Score', 'X-Spam-Status']
  },
  {
    type: 'virus',
    action: 'reject',
    quarantine: true
  },
  {
    type: 'attachment',
    blockedExtensions: ['.exe', '.bat', '.scr'],
    maxSize: 25 * 1024 * 1024 // 25MB
  }
];
```

## SmartProxy Routing

### HTTP/HTTPS Routing

```typescript
const routes = [
  // API routing with path-based forwarding
  {
    name: 'api-gateway',
    match: {
      domains: ['api.example.com'],
      ports: [443]
    },
    action: {
      type: 'forward',
      targets: [{ host: '192.168.1.20', port: 8080 }],
      tls: {
        mode: 'terminate',
        certificate: 'auto'
      }
    }
  },

  // Static file serving
  {
    name: 'static-assets',
    match: {
      domains: ['cdn.example.com'],
      ports: [443]
    },
    action: {
      type: 'serve',
      root: '/var/www/static',
      tls: {
        mode: 'terminate',
        certificate: 'auto'
      }
    }
  }
];
```

### TCP/SNI Routing

```typescript
const tcpRoutes = [
  // Database connection routing
  {
    name: 'database-cluster',
    match: {
      ports: [{ from: 5432, to: 5439 }]
    },
    action: {
      type: 'forward',
      targets: [{ host: '192.168.1.30', port: 'preserve' }],
      security: {
        ipAllowList: ['192.168.1.0/24']
      }
    }
  },

  // SNI-based routing for TLS services
  {
    name: 'secure-service',
    match: {
      domains: ['secure.example.com'],
      ports: [8443]
    },
    action: {
      type: 'forward',
      targets: [{ host: '192.168.1.40', port: 8443 }],
      tls: {
        mode: 'passthrough'
      }
    }
  }
];
```

## RADIUS Server

DcRouter includes a RADIUS server for network access control:

### Basic RADIUS Configuration

```typescript
const router = new DcRouter({
  radiusConfig: {
    port: 1812,
    secret: 'your-radius-secret',
    clients: [
      {
        name: 'switch-1',
        ip: '192.168.1.1',
        secret: 'client-secret'
      }
    ]
  }
});
```

### MAC Authentication Bypass (MAB)

```typescript
const router = new DcRouter({
  radiusConfig: {
    port: 1812,
    secret: 'radius-secret',
    macAuth: {
      enabled: true,
      allowedMacs: [
        'aa:bb:cc:dd:ee:ff',
        'aa:bb:cc:*'  // Wildcard for OUI matching
      ],
      defaultVlan: 100,
      guestVlan: 999
    }
  }
});
```

### VLAN Assignment

```typescript
const router = new DcRouter({
  radiusConfig: {
    secret: 'radius-secret',
    vlanAssignment: [
      {
        match: { mac: 'aa:bb:cc:*' },  // Vendor OUI match
        vlan: 100
      },
      {
        match: { mac: 'dd:ee:ff:*' },
        vlan: 200
      },
      {
        match: { default: true },
        vlan: 999  // Guest VLAN
      }
    ]
  }
});
```

## Storage System

### StorageManager

DcRouter includes a flexible storage system that supports multiple backends:

#### **Filesystem Storage**
```typescript
const router = new DcRouter({
  storage: {
    fsPath: '/var/lib/dcrouter/data'
  }
});
```

#### **Custom Storage Backend**
```typescript
const router = new DcRouter({
  storage: {
    readFunction: async (key) => {
      // Read from Redis, S3, etc.
      return await myDatabase.get(key);
    },
    writeFunction: async (key, value) => {
      // Write to Redis, S3, etc.
      await myDatabase.set(key, value);
    }
  }
});
```

#### **Memory Storage (Development)**
```typescript
const router = new DcRouter({
  // No storage config = memory storage with warning
});
```

### Storage Usage

The storage system is used for:
- **DKIM Keys**: `/email/dkim/{domain}/private.key`, `/email/dkim/{domain}/public.key`
- **Email Routes**: `/email/routes/{routeId}.json`
- **Bounce Lists**: `/email/bounces/suppression.json`
- **IP Reputation**: `/security/ip-reputation/{ip}.json`
- **Domain Configs**: `/email/domains/{domain}.json`

## Security Features

### IP Reputation Checking

```typescript
import { IpReputationChecker } from '@serve.zone/dcrouter';

const ipChecker = new IpReputationChecker({
  providers: ['spamhaus', 'barracuda', 'surbl'],
  cacheTimeout: 3600000, // 1 hour
  threshold: 0.7
});

// Check IP reputation
const result = await ipChecker.checkIp('192.0.2.1');
if (result.isBlocked) {
  console.log(`IP blocked: ${result.reason}`);
}
```

### Rate Limiting

```typescript
const router = new DcRouter({
  emailConfig: {
    rateLimits: {
      inbound: {
        messagesPerMinute: 100,
        connectionsPerIp: 10,
        recipientsPerMessage: 50
      },
      outbound: {
        messagesPerHour: 1000,
        messagesPerDay: 10000
      }
    }
  }
});
```

## OpsServer Dashboard

The OpsServer provides a web-based management interface:

### Features

- **Real-time Statistics**: View connections, email throughput, DNS queries, RADIUS sessions
- **Configuration Management**: Update routes and settings via API
- **Log Viewer**: Access system logs with filtering
- **Security Dashboard**: Monitor threats and blocked connections

### API Endpoints

The OpsServer exposes TypedRequest endpoints:

```typescript
// Health check
POST /typedrequest { method: 'getHealthStatus' }

// Server statistics
POST /typedrequest { method: 'getServerStatistics' }

// Configuration
POST /typedrequest { method: 'getConfiguration' }
POST /typedrequest { method: 'updateConfiguration', data: { ... } }

// Logs
POST /typedrequest { method: 'getLogs', data: { level: 'info', limit: 100 } }

// RADIUS
POST /typedrequest { method: 'getRadiusSessions' }
POST /typedrequest { method: 'getRadiusClients' }
```

## API Reference

### DcRouter Class

#### Constructor
```typescript
constructor(options: IDcRouterOptions)
```

#### Methods

##### `start(): Promise<void>`
Starts all configured services (SmartProxy, email server, DNS server, RADIUS server, OpsServer).

##### `stop(): Promise<void>`
Gracefully stops all services.

##### `updateRoutes(routes: IRouteConfig[]): Promise<void>`
Updates SmartProxy routes dynamically.

##### `updateDomainRules(rules: IDomainRule[]): Promise<void>`
Updates email domain routing rules.

##### `getStats(): IStatsResponse`
Returns real-time statistics for all services.

### Email Service API

#### `sendEmail(options: IEmailOptions): Promise<string>`
```typescript
const emailId = await router.emailService.sendEmail({
  from: 'sender@example.com',
  to: 'recipient@example.com',
  subject: 'Test Email',
  html: '<p>Hello World</p>',
  attachments: []
});
```

#### `getEmailStatus(emailId: string): IEmailStatus`
```typescript
const status = router.emailService.getEmailStatus(emailId);
console.log(status.status); // 'pending', 'sent', 'delivered', 'bounced'
```

## Examples

### Complete Enterprise Setup

```typescript
import { DcRouter } from '@serve.zone/dcrouter';

const router = new DcRouter({
  // OpsServer dashboard
  opsServerConfig: {
    port: 3000,
    admin: {
      username: 'admin',
      password: process.env.ADMIN_PASSWORD
    }
  },

  // HTTP/HTTPS routing
  smartProxyConfig: {
    routes: [
      // Main website
      {
        name: 'website',
        priority: 100,
        match: { domains: ['example.com', 'www.example.com'], ports: [443] },
        action: {
          type: 'forward',
          targets: [{ host: '192.168.1.10', port: 80 }],
          tls: { mode: 'terminate', certificate: 'auto' }
        }
      },

      // API services
      {
        name: 'api',
        priority: 110,
        match: { domains: ['api.example.com'], ports: [443] },
        action: {
          type: 'forward',
          targets: [{ host: '192.168.1.20', port: 8080 }],
          tls: { mode: 'terminate', certificate: 'auto' }
        }
      }
    ],

    // ACME certificate automation
    acme: {
      email: 'ssl@example.com',
      enabled: true,
      useProduction: true,
      autoRenew: true
    }
  },

  // Enterprise email system
  emailConfig: {
    ports: [25, 587, 465],
    hostname: 'mail.example.com',

    // Domain configuration
    domains: [
      {
        domain: 'example.com',
        dnsMode: 'external-dns',
        dkim: {
          selector: 'mail',
          rotateKeys: true
        }
      }
    ],

    // Email routing rules
    routes: [
      // Relay from office network
      {
        name: 'office-relay',
        priority: 100,
        match: { clientIp: '192.168.0.0/16' },
        action: {
          type: 'forward',
          forward: { host: 'internal-mail.example.com', port: 25 }
        }
      },

      // Process transactional emails
      {
        name: 'notifications',
        priority: 50,
        match: { recipients: '*@notifications.example.com' },
        action: {
          type: 'process',
          process: { scan: true, dkim: true, queue: 'priority' }
        }
      },

      // Default reject
      {
        name: 'default-reject',
        match: { recipients: '*' },
        action: {
          type: 'reject',
          reject: { code: 550, message: 'Relay denied' }
        }
      }
    ]
  },

  // RADIUS for network devices
  radiusConfig: {
    port: 1812,
    secret: process.env.RADIUS_SECRET,
    macAuth: {
      enabled: true,
      defaultVlan: 100,
      guestVlan: 999
    }
  },

  // DNS server for ACME challenges
  dnsServerConfig: {
    port: 53,
    authoritative: true
  },

  // Cloudflare DNS challenges
  dnsChallenge: {
    cloudflareApiKey: process.env.CLOUDFLARE_API_KEY
  },

  // Persistent storage
  storage: {
    fsPath: '/var/lib/dcrouter/data'
  }
});

// Start the router
await router.start();
console.log('Enterprise DcRouter started');

// Monitor statistics
setInterval(() => {
  const stats = router.getStats();
  console.log('Active connections:', stats.activeConnections);
  console.log('Emails processed:', stats.emailsProcessed);
}, 60000);
```

## Testing

### Comprehensive Test Suite

DcRouter includes a comprehensive test suite with 195 test files covering all aspects of the system:

#### SMTP Protocol Tests
- **Commands**: EHLO, HELO, MAIL FROM, RCPT TO, DATA, RSET, NOOP, QUIT, VRFY, EXPN, HELP
- **Extensions**: SIZE, PIPELINING, STARTTLS
- **Connection Management**: TLS/plain connections, timeouts, limits, rejection handling
- **Error Handling**: Syntax errors, invalid sequences, temporary/permanent failures
- **Email Processing**: Basic sending, multiple recipients, large emails, invalid addresses
- **Security**: Authentication, rate limiting
- **Performance**: Throughput testing
- **Edge Cases**: Very large emails, special characters

#### Running Tests

```bash
# Run all tests
pnpm test

# Run specific test categories
tsx test/suite/smtpserver_commands/test.cmd-01.ehlo-command.ts

# Run with verbose output
tstest test/test.integration.ts --verbose
```

## Troubleshooting

### Common Issues

#### Certificate Issues
```bash
# Check certificate status
curl -I https://your-domain.com

# Verify ACME challenge accessibility
curl http://your-domain.com/.well-known/acme-challenge/test
```

#### Email Delivery Issues
```bash
# Test SMTP connectivity
telnet your-server.com 25

# Check DKIM record
dig TXT mail._domainkey.your-domain.com

# Verify SPF record
dig TXT your-domain.com
```

#### Email Routing Issues

**Route Not Matching**
- Check route priority order (higher priority = evaluated first)
- Verify glob patterns: `*@example.com` matches domain, `admin@*` matches user
- Test CIDR notation: `192.168.0.0/16` includes all 192.168.x.x addresses
- Confirm authentication state matches your expectations

#### DNS Issues
```bash
# Test DNS server
dig @your-server.com your-domain.com

# Check DNS propagation
dig your-domain.com @8.8.8.8
```

### Performance Tuning

```typescript
const performanceConfig = {
  // Connection limits
  maxConnections: 1000,
  connectionTimeout: 30000,

  // Email queue settings
  emailQueue: {
    concurrency: 10,
    maxRetries: 3,
    retryDelay: 300000
  },

  // Cache settings
  cache: {
    ipReputation: { ttl: 3600000 }, // 1 hour
    dns: { ttl: 300000 }, // 5 minutes
    certificates: { ttl: 86400000 } // 24 hours
  }
};
```

## License and Legal Information

This repository contains open-source code licensed under the MIT License. A copy of the license can be found in the [LICENSE](./LICENSE) file.

**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.

### Trademarks

This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH or third parties, and are not included within the scope of the MIT license granted herein.

Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines or the guidelines of the respective third-party owners, and any usage must be approved in writing. Third-party trademarks used herein are the property of their respective owners and used only in a descriptive manner, e.g. for an implementation of an API or similar.

### Company Information

Task Venture Capital GmbH
Registered at District Court Bremen HRB 35230 HB, Germany

For any legal inquiries or further information, please contact us via email at hello@task.vc.

By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.