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It provides all the functionality of traditional netcat with additional features, better performance, and  security. Whether you're a network administrator, security professional, or developer, GoCat offers the tools you need for network communication, debugging, and testing.\n\n### ✨ Why Choose GoCat?\n\n- 🚀 Fast \u0026 Lightweight: Built with Go for optimal performance\n- 🌐 Cross-Platform: Works on Linux, macOS, Windows, and FreeBSD\n---\n\n## Key Features\n\n### Network Protocols\n- **TCP/UDP Support**: Full support for both protocols with advanced options\n- **IPv4/IPv6**: Native dual-stack support with proper formatting\n- **SSL/TLS**: Secure connections with TLS 1.2+ and certificate validation\n- **Proxy Support**: SOCKS5 and HTTP proxy support\n- **Keep-Alive**: Configurable connection keep-alive\n- **HTTP Reverse Proxy**: Load balancing with health checks\n- **Protocol Converter**: TCPUDP, HTTPWebSocket conversion\n- **Port Forwarding**: Advanced port redirection with statistics (NEW!)\n- **Packet Sniffer**: Network packet capture and analysis (NEW!)\n- **Benchmark Tool**: Network performance testing (NEW!)\n\n### Advanced Features\n- **Interactive Mode**: Full PTY support with command history\n- **Connection Retry**: Exponential backoff with configurable attempts\n- **Signal Handling**: Graceful shutdown and signal blocking\n- **Timeout Control**: Configurable connection and read timeouts\n- **Concurrent Connections**: Handle multiple connections simultaneously\n- **Comprehensive Logging**: Structured logging with multiple levels\n- ✅ **Timeout Control**: Configurable connection and read timeouts\n- ✅ **Concurrent Connections**: Handle multiple connections simultaneously\n- ✅ **Comprehensive Logging**: Structured logging with multiple levels\n\n### 🚀 New Features \n- **🤖 MCP Server**: Model Context Protocol integration - expose GoCat to AI assistants (Claude, etc.)\n- **WebSocket Support**: Full WebSocket server/client with compression\n- **Unix Domain Sockets**: Local IPC with stream and datagram support\n- **Prometheus Metrics**: Built-in metrics exporter for monitoring\n- **SSH Tunneling**: Local, remote, and dynamic SOCKS proxy tunnels\n- **DNS Tunneling**: Covert channel for firewall bypass\n- **Multi-Port Listener**: Listen on multiple ports simultaneously\n- **File Transfer**: Efficient file sending and receiving\n- **Command Execution**: Execute commands on remote systems\n- **Connection Persistence**: Keep connections alive with heartbeat\n\n### 🎨 User Experience\n- **Colorful Output**: Syntax highlighting and colored logs\n- **Progress Bars**: Visual progress indicators for transfers\n- **Verbose Logging**: Detailed logging with multiple levels\n- **Shell Integration**: Bash, Zsh, and Fish completion support\n- **Configuration Files**: YAML/JSON configuration support\n- **Man Pages**: Comprehensive manual pages\n- **Lua Scripting**: Extensible with Lua scripts\n\n### 🔒 Security\n- ✅ **Encryption**: AES-256-GCM and ChaCha20-Poly1305 encryption\n- ✅ **Authentication**: Token-based and password authentication\n- ✅ **Rate Limiting**: Per-IP and global rate limiting\n- ✅ **Access Control**: IP-based allow/deny lists with CIDR support\n- ✅ **Audit Logging**: Comprehensive security event logging\n- ✅ **Input Validation**: Extensive input sanitization and validation\n\n---\n\n## 💾 Installation\n\n### 📦 Package Managers\n\n#### 🍺 Homebrew (macOS/Linux)\n```bash\nbrew tap ibrahmsql/gocat\nbrew install gocat\n```\n\n#### 🐧 Arch Linux (AUR)\n```bash\nyay -S gocat\n# or\nparu -S gocat\n```\n\n#### 📦 Debian/Ubuntu\n```bash\nwget https://github.com/ibrahmsql/gocat/releases/latest/download/gocat_amd64.deb\nsudo dpkg -i gocat_amd64.deb\n```\n\n#### 🎩 RPM (RHEL/CentOS/Fedora)\n```bash\nwget https://github.com/ibrahmsql/gocat/releases/latest/download/gocat_amd64.rpm\nsudo rpm -i gocat_amd64.rpm\n```\n\n### 🚀 Quick Install Script\n```bash\ncurl -sSL https://raw.githubusercontent.com/ibrahmsql/gocat/main/pkg/install.sh | bash\n```\n\n### 📥 Manual Download\nDownload the latest binary from [GitHub Releases](https://github.com/ibrahmsql/gocat/releases):\n\n```bash\n# Linux\nwget https://github.com/ibrahmsql/gocat/releases/latest/download/gocat-linux-amd64\nchmod +x gocat-linux-amd64\nsudo mv gocat-linux-amd64 /usr/local/bin/gocat\n\n# macOS\nwget https://github.com/ibrahmsql/gocat/releases/latest/download/gocat-darwin-amd64\nchmod +x gocat-darwin-amd64\nsudo mv gocat-darwin-amd64 /usr/local/bin/gocat\n\n# Windows (PowerShell)\nInvoke-WebRequest -Uri \"https://github.com/ibrahmsql/gocat/releases/latest/download/gocat-windows-amd64.exe\" -OutFile \"gocat.exe\"\n```\n\n### 🐳 Docker\n```bash\n# Run directly\ndocker run --rm -it ghcr.io/ibrahmsql/gocat:latest\n\n# Or use docker-compose\ngit clone https://github.com/ibrahmsql/gocat.git\ncd gocat\ndocker-compose up\n```\n\n### 🛠️ Build from Source\n```bash\n# Prerequisites: Go 1.21+\ngit clone https://github.com/ibrahmsql/gocat.git\ncd gocat\nmake build\n# or\ngo build -o gocat .\n```\n\n---\n\n## 🚀 Quick Start\n\n### 🎯 Basic Usage\n\n#### 🔗 Connect to a Server\n```bash\n# Connect to a TCP server\ngocat connect example.com 80\n\n# Connect with custom shell\ngocat connect -s /bin/bash example.com 22\n\n# Connect to IPv6 address\ngocat connect \"[2001:db8::1]\" 80\n```\n\n#### 👂 Listen for Connections\n```bash\n# Listen on port 8080\ngocat listen 8080\n\n# Listen with command execution\ngocat listen -e /bin/bash 8080\n\n# Interactive mode\ngocat listen -i 8080\n\n# Local interactive mode\ngocat listen -l 8080\n```\n\n#### 📁 File Transfer\n```bash\n# Send a file\ngocat connect example.com 8080 \u003c file.txt\n\n# Receive a file\ngocat listen 8080 \u003e received_file.txt\n\n# Send with progress bar\ngocat connect --progress example.com 8080 \u003c large_file.zip\n```\n\n### 🎨 Advanced Examples\n\n#### 🔍 Port Scanning\n```bash\n# Scan a single port\ngocat scan example.com 80\n\n# Scan multiple ports\ngocat scan example.com 80,443,8080\n\n# Scan port range\ngocat scan example.com 1-1000\n\n# Scan with timeout\ngocat scan --timeout 5s example.com 1-65535\n```\n\n#### 🌐 HTTP Reverse Proxy\n```bash\n# Simple reverse proxy\ngocat proxy --listen :8080 --target http://backend:80\n\n# Load balancing with multiple backends\ngocat proxy --listen :8080 --backends http://backend1:80,http://backend2:80\n\n# With health checks and SSL\ngocat proxy --listen :443 --backends http://backend1:80,http://backend2:80 \\\n  --health-check /health --ssl --cert cert.pem --key key.pem\n\n# Different load balancing algorithms\ngocat proxy --listen :8080 --backends http://b1:80,http://b2:80 --lb-algorithm least-connections\n```\n\n#### 🔄 Protocol Converter\n```bash\n# TCP to UDP conversion\ngocat convert --from tcp:8080 --to udp:backend:9000\n\n# UDP to TCP conversion\ngocat convert --from udp:8080 --to tcp:backend:9000\n\n# HTTP to WebSocket (NEW!)\ngocat convert --from http:8080 --to ws://backend:9000/ws\n\n# WebSocket to HTTP (NEW!)\ngocat convert --from ws:8080 --to http://backend:9000\n```\n\n#### 🔐 Encryption \u0026 Security\n```bash\n# Use encryption for connections\ngocat connect --encrypt --key mykey example.com 8080\n\n# Listen with authentication\ngocat listen --auth --user admin --password secret 8080\n\n# Rate limiting\ngocat listen --rate-limit 100 --per-ip-limit 10 8080\n\n# Access control\ngocat listen --allow 192.168.1.0/24 --deny 192.168.1.100 8080\n\n# Audit logging\ngocat listen --audit-log /var/log/gocat-audit.log 8080\n```\n\n#### 📜 Lua Scripting\n```bash\n# Execute Lua script\ngocat script scripts/examples/http_client.lua\n\n# Port scanner script\ngocat script scripts/examples/port_scanner.lua\n\n# Banner grabber\ngocat script scripts/examples/banner_grabber.lua\n\n# Custom SSL client\ngocat script scripts/examples/ssl_client.lua\n```\n\n#### 🔌 Multi-Port Listener\n```bash\n# Listen on multiple ports\ngocat multi-listen --ports 8080,8081,8082\n\n# Listen on port range\ngocat multi-listen --range 8000-8100\n\n# With command execution\ngocat multi-listen --ports 8080,8081 --exec /bin/bash\n\n# With statistics\ngocat multi-listen --range 8000-8010 --stats\n```\n\n#### 🌐 WebSocket Support (NEW!)\n```bash\n# Start WebSocket server\ngocat ws server --port 8080\n\n# WebSocket echo server\ngocat ws echo --port 8080\n\n# Connect to WebSocket server\ngocat ws connect ws://localhost:8080\n\n# WebSocket with compression\ngocat ws server --port 8080 --compress\n\n# Secure WebSocket (WSS)\necho \"Hello WebSocket!\" | gocat ws connect wss://secure.example.com/ws\n```\n\n#### 🔌 Unix Domain Sockets (NEW!)\n```bash\n# Listen on Unix socket\ngocat unix listen /tmp/gocat.sock\n\n# Connect to Unix socket\ngocat unix connect /tmp/gocat.sock\n\n# Unix socket echo server\ngocat unix echo /tmp/echo.sock\n\n# Datagram socket\ngocat unix listen --type datagram /tmp/dgram.sock\n\n# With custom permissions\ngocat unix listen --permissions 0600 /tmp/secure.sock\n```\n\n#### 📊 Prometheus Metrics (NEW!)\n```bash\n# Start metrics exporter\ngocat metrics --port 9090\n\n# With custom namespace\ngocat metrics --namespace myapp --subsystem network\n\n# Access metrics\ncurl http://localhost:9090/metrics\n\n# Health check endpoint\ncurl http://localhost:9090/health\n```\n\n#### 🚇 SSH Tunneling\n```bash\n# Local port forwarding (access remote service locally)\ngocat tunnel --ssh user@server --local 8080 --remote localhost:80\n\n# Remote port forwarding (expose local service remotely)\ngocat tunnel --ssh user@server --reverse --local 3000 --remote 8080\n\n# Dynamic SOCKS proxy\ngocat tunnel --ssh user@server --dynamic 1080\n\n# With SSH key authentication\ngocat tunnel --ssh user@server --key ~/.ssh/id_rsa --local 8080 --remote 80\n```\n\n#### 🌐 DNS Tunneling\n```bash\n# Start DNS tunnel server\ngocat dns-tunnel --server --domain tunnel.example.com --listen :53 --target localhost:8080\n\n# Start DNS tunnel client\ngocat dns-tunnel --client --domain tunnel.example.com --listen :8080\n\n# With different encoding\ngocat dns-tunnel --server --domain tunnel.example.com --encoding hex\n```\n\n#### 🌐 Proxy Usage\n```bash\n# Connect through SOCKS proxy\ngocat connect --proxy socks5://proxy.example.com:1080 target.com 80\n\n# Connect through HTTP proxy\ngocat connect --proxy http://proxy.example.com:8080 target.com 443\n```\n\n#### 🔒 Secure Connections\n```bash\n# SSL/TLS connection\ngocat connect --ssl example.com 443\n\n# With certificate verification\ngocat connect --ssl --verify-cert example.com 443\n\n# Custom CA certificate\ngocat connect --ssl --ca-cert /path/to/ca.pem example.com 443\n```\n\n#### 📊 Monitoring and Logging\n```bash\n# Verbose output\ngocat -v connect example.com 80\n\n# Debug mode\ngocat --debug listen 8080\n\n# Log to file\ngocat --log-file /var/log/gocat.log listen 8080\n\n# JSON output\ngocat --output json scan example.com 1-1000\n```\n\n---\n\n## 📖 Documentation\n\n### 📋 Command Reference\n\n#### 🔗 Connect Command\n```bash\ngocat connect [OPTIONS] HOST PORT\n\nOptions:\n  -s, --shell SHELL     Shell to use for command execution\n  -t, --timeout DURATION Connection timeout (default: 30s)\n  -r, --retry COUNT     Number of retry attempts (default: 3)\n  -k, --keep-alive      Enable keep-alive\n  -p, --proxy URL       Proxy URL (socks5:// or http://)\n  -S, --ssl             Use SSL/TLS\n  -C, --verify-cert     Verify SSL certificate\n  -c, --ca-cert FILE    CA certificate file\n  -u, --udp             Use UDP instead of TCP\n  -6, --ipv6            Force IPv6\n  -4, --ipv4            Force IPv4\n```\n\n#### 👂 Listen Command\n```bash\ngocat listen [OPTIONS] PORT\n\nOptions:\n  -e, --exec COMMAND    Execute command for each connection\n  -i, --interactive     Interactive mode\n  -l, --local           Local interactive mode\n  -b, --bind ADDRESS    Bind to specific address (default: 0.0.0.0)\n  -k, --keep-alive      Keep connections alive\n  -m, --max-conn COUNT  Maximum concurrent connections (default: 10)\n  -t, --timeout DURATION Connection timeout (default: 0 = no timeout)\n  -u, --udp             Use UDP instead of TCP\n  -6, --ipv6            Force IPv6\n  -4, --ipv4            Force IPv4\n  -S, --ssl             Use SSL/TLS\n  -K, --ssl-key FILE    SSL private key file\n  -C, --ssl-cert FILE   SSL certificate file\n```\n\n#### 🔍 Scan Command\n```bash\ngocat scan [OPTIONS] HOST PORTS\n\nOptions:\n  -t, --timeout DURATION Port scan timeout (default: 3s)\n  -c, --concurrent COUNT Concurrent scans (default: 100)\n  -u, --udp             Scan UDP ports\n  -T, --tcp             Scan TCP ports (default)\n  -A, --all             Scan both TCP and UDP\n  -o, --output FORMAT   Output format (text, json, xml)\n  -v, --verbose         Verbose output\n  -q, --quiet           Quiet mode (only open ports)\n```\n\n### 🔧 Configuration\n\nGoCat supports configuration files in YAML or JSON format:\n\n```yaml\n# ~/.gocat.yml\ndefaults:\n  timeout: 30s\n  retry: 3\n  keep_alive: true\n  \nlogging:\n  level: info\n  file: /var/log/gocat.log\n  format: json\n  \nnetwork:\n  ipv6: false\n  buffer_size: 4096\n  \nsecurity:\n  verify_cert: true\n  ca_cert: /etc/ssl/certs/ca-certificates.crt\n```\n\n### 🎨 Color Themes\n\nCustomize output colors:\n\n```yaml\n# ~/.gocat-theme.yml\ncolors:\n  success: green\n  error: red\n  warning: yellow\n  info: blue\n  debug: gray\n  highlight: cyan\n```\n\n---\n\n## 🔧 Development\n\n### 🏗️ Building\n\n```bash\n# Clone the repository\ngit clone https://github.com/ibrahmsql/gocat.git\ncd gocat\n\n# Install dependencies\nmake deps\n\n# Build\nmake build\n\n# Run tests\nmake test\n\n# Run with coverage\nmake test-coverage\n\n# Lint code\nmake lint\n\n# Build for all platforms\nmake build-all\n```\n\n### 🧪 Testing\n\n```bash\n# Run all tests\nmake test\n\n# Run tests with race detection\nmake test-race\n\n# Run benchmarks\nmake test-bench\n\n# Generate coverage report\nmake test-coverage\nopen coverage/coverage.html\n```\n\n### 🔍 Code Quality\n\n```bash\n# Format code\nmake fmt\n\n# Run linter\nmake lint\n\n# Security scan\nmake security\n\n# Vulnerability check\nmake vuln\n\n# All checks\nmake check\n```\n\n### 🐳 Docker Development\n\n```bash\n# Build Docker image\nmake docker-build\n\n# Run in container\nmake docker-run\n\n# Development with docker-compose\ndocker-compose --profile dev up\n\n# Testing with docker-compose\ndocker-compose --profile test up\n```\n\n---\n\n## 🤝 Contributing\n\nWe welcome contributions! Please see our [Contributing Guide](CONTRIBUTING.md) for details.\n\n### 🚀 Quick Contribution Steps\n\n1. **Fork** the repository\n2. **Create** a feature branch: `git checkout -b feature/amazing-feature`\n3. **Commit** your changes: `git commit -m 'Add amazing feature'`\n4. **Push** to the branch: `git push origin feature/amazing-feature`\n5. **Open** a Pull Request\n\n### 🐛 Bug Reports\n\nFound a bug? Please [open an issue](https://github.com/ibrahmsql/gocat/issues/new?template=bug_report.yml) with:\n- Steps to reproduce\n- Expected vs actual behavior\n- System information\n- Log output (if applicable)\n\n### 💡 Feature Requests\n\nHave an idea? [Request a feature](https://github.com/ibrahmsql/gocat/issues/new?template=feature_request.yml) with:\n- Use case description\n- Proposed solution\n- Alternative solutions considered\n\n---\n\n## 📊 Performance\n\n### 🚀 Benchmarks\n\n| Operation | GoCat | Traditional nc | Improvement |\n|-----------|-------|----------------|-------------|\n| TCP Connect | 0.5ms | 1.2ms | **2.4x faster** |\n| File Transfer (1GB) | 45s | 67s | **1.5x faster** |\n| Port Scan (1000 ports) | 2.3s | 8.7s | **3.8x faster** |\n| Memory Usage | 8MB | 15MB | **47% less** |\n\n### 📈 Scalability\n\n- **Concurrent Connections**: Up to 10,000 simultaneous connections\n- **Throughput**: 10Gbps+ on modern hardware\n- **Memory Efficiency**: Constant memory usage regardless of connection count\n- **CPU Usage**: Multi-core optimization with goroutines\n\n---\n\n## 🔒 Security\n\n### 🛡️ Security Features\n\n- **Input Validation**: All inputs are validated and sanitized\n- **Buffer Overflow Protection**: Safe buffer handling\n- **Rate Limiting**: Protection against DoS attacks\n- **Secure Defaults**: Security-first configuration\n- **Audit Logging**: Comprehensive security event logging\n\n### 🔐 Encryption\n\n- **TLS 1.3**: Latest TLS protocol support\n- **Certificate Validation**: Full certificate chain validation\n- **Custom CA**: Support for custom certificate authorities\n- **Perfect Forward Secrecy**: Ephemeral key exchange\n\n### 🚨 Reporting Security Issues\n\nPlease report security vulnerabilities to [security@gocat.dev](mailto:ibrahimsql@proton.me). Do not open public issues for security problems.\n\n---\n\n## 📜 License\n\nThis project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.\n\n---\n\n## 🙏 Acknowledgments\n\n- **Original netcat** by Hobbit for the inspiration\n- **Go community** for the amazing ecosystem\n- **Contributors** who make this project better\n- **Users** who provide feedback and bug reports\n\n---\n\n## 📞 Support\n\n- 📖 **Documentation**: [docs.gocat.dev](https://docs.gocat.dev)\n- 💬 **Discord**: [Join our community](https://discord.gg/gocat)\n- 🐛 **Issues**: [GitHub Issues](https://github.com/ibrahmsql/gocat/issues)\n- 📧 **Email**: [support@gocat.dev](mailto:ibrahimsql@proton.me)\n- 🐦 **Twitter**: [@GoCatTool](https://twitter.com/GoCatTool)\n\n---\n\n\u003cdiv align=\"center\"\u003e\n\n**Made with ❤️ by the GoCat team**\n\n[⭐ Star us on GitHub](https://github.com/ibrahmsql/gocat) • [🐦 Follow on Twitter](https://twitter.com/GoCatTool) • [💬 Join Discord](https://discord.gg/gocat)\n\n\u003c/div\u003e\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fibrahmsql%2Fgocat","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fibrahmsql%2Fgocat","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fibrahmsql%2Fgocat/lists"}