Programming Guides › Programming Guide for C › Authorization API › Active Expressions › Tunnel Service API › Tunnel Service API Overview

Tunnel Service API Overview

The Tunnel Service API provides secure transfer of data between an agent and a shared library that supports the Tunnel Service.

When an agent sends a tunnel request to the Policy Server, the request contains:

• The name of the service library
• The function to be called in the service library
• The data to be passed to the function

The Policy Server initializes the appropriate service, invokes the requested function, and passes the data to the function. Once the service has performed its task, the Policy Server returns the results to the agent. The following graphic shows how the API is used in the tunnel service process: