HW1 SPRC

Project Overview

This project involves implementing client and server components that adhere to the OAuth authentication model using the RPC protocol. The implementation is based on diagrams provided in the resource directory and project file.

Implementation Details

General Approach

• Implemented in C
• Server uses a linked list as a simple database
• Global variables defined in auth.h for access in rpc_server.c
• Interface defined in auth.h
• Structures and functions for the server defined in auth.x

Server Implementation

• Only modified the server stub (auth_svc.c)
• Parses input files to populate linked lists
• Uses global variables for list references (due to RPC protocol limitations)

Client Implementation

• Defined a vector of clients in rpc_client.c
• Each client handles a user based on IDs from client.in
• Maintains a unique list of IDs (similar to a set)
• Implements logical ordering of execution flow for operations/requests

Execution Scenario Example

client.in:
1. oD0prOgBqAsXBW8, REQUEST, 0
2. oD0prOgBqAsXBW8, MODIFY, Files
3. OVotQBYz418Ozkz, REQUEST, 1
4. OVotQBYz418Ozkz, EXECUTE, Applications
5. OVotQBYz418Ozkz, DELETE, Files
6. oD0prOgBqAsXBW8, INSERT, UserData
7. OVotQBYz418Ozkz, READ, System Settings

• Two clients: client[0].user_id = "oD0prOgBqAsXBW8" and client[1].user_id = "OVotQBYz418Ozkz"
• Operations executed in order based on client ID

Server-Client Communication

• Server returns dynamically allocated strings with helper information
• Uses strtok function extensively
• Refresh token "signed" with number 2 to indicate access token regeneration

Server Functions

• Implements functions as described in the project statement
• Additional valid_permission function for action verification

File Structure

• auth.h: Interface definition and global variables
• auth.x: Structures and functions for the server
• rpc_server.c: Server implementation
• rpc_client.c: Client implementation
• auth_svc.c: Modified server stub

Makefile

• Contains two rules: run_client and run_server
• Test index can be modified in these rules

Resources Used

• rpcgen manual

Notes

• Newlines added to test files for validation
• Implementation focused on logical ordering of execution flow
• Server unable to modify structure fields sent by reference; workaround implemented