Phase 2: Extract Utilities

This issue tracks Phase 2 of the code refactoring plan as outlined in REFACTORING_PLAN.md.

Goals

Extract and test utility functions (lowest risk refactoring phase):

• String utilities (strscpy, strtolower, trim_space)
• Logging abstraction (log_init, log_message, log_shutdown)
• Memory safety (SAFE_FREE, safe_calloc, safe_strdup)
• IP utilities (ip_cidr_match, translate_nat_ip)

Deliverables

• src/utils/ module created with proper structure
• src/utils/string_utils.{c,h} - String manipulation functions
• src/utils/logging.{c,h} - Logging abstraction layer
• src/utils/memory.{c,h} - Memory safety utilities
• src/utils/ip_utils.{c,h} - IP address utilities
• Makefile updated for multi-file compilation
• All existing tests pass without changes
• Code compiles with zero warnings

Success Criteria

• ✅ All existing integration tests pass
• ✅ No functional changes to behavior
• ✅ Code compiles without warnings (-Wall -Wextra)
• ✅ Utilities are isolated and independently testable
• ✅ Clean separation of concerns

Testing Strategy

• Run full test suite before and after changes
• Verify identical behavior
• Ensure no memory leaks (valgrind clean)
• Build passes in CI/CD pipeline

Timeline

Estimated: 1 week (Phase 2 of 10-phase refactoring plan)

Related

• Parent Plan: REFACTORING_PLAN.md
• Branch: refactor/phase-2-utilities
• Next Phase: Phase 3 - Extract Configuration Module

Note: This refactoring maintains 100% backward compatibility. No external behavior changes.