Implement Wazuh Agent Daemon Mode

[vikman90]

Parent Issue:

• Implement Service and Packaging for New Wazuh Agent #126

Description

The goal is to enhance the Wazuh agent by implementing a daemon (background process) mode. This will allow the agent to run continuously in the background, with the ability to manage it through a set of CLI commands (start, stop, status). The agent will be required to handle process management in both UNIX-like systems (Linux and macOS) and Windows environments. The implementation should follow best practices for daemon processes and system services for each platform.

Functional Requirements

1. wazuh-agent will act as a CLI by default.
2. wazuh-agent start:
   • Starts the Wazuh agent in the background.
   • Creates a new process and calls wazuh-agent --daemon.
3. wazuh-agent --daemon:
   • Starts the Wazuh agent as a daemon/background service.
4. wazuh-agent status:
   • Reports the current status of the Wazuh agent daemon (running/stopped).
5. wazuh-agent stop:
   • Locates and terminates the background Wazuh agent process.

Non-Functional Requirements

• Compatibility with both UNIX (Linux/macOS) and Windows.
• Logs and errors should be appropriately handled and logged in respective system logs (e.g., syslog for UNIX, Event Viewer for Windows).

Plan

1. Implement Daemon Mode for UNIX-based Systems (Linux, macOS) #141
   • Implement process forking, logging, and background operation.
   • Create system integration scripts for init systems (systemd, launchd).
2. Implement Daemon Mode for Windows #142
   • Implement the service wrapper for the Wazuh agent using Windows APIs.
   • Integrate with Windows Service Manager (service start/stop/status).