Major improvements to the standalone malware scanner for foolproof operation:
**Error Handling:**
- Added error checking for all scanner update commands
- ImunifyAV: Check scan command exit status, continue on failure
- ClamAV: Properly handle exit codes (0=clean, 1=infected, >1=error)
- Maldet: Check scan exit status and cleanup temp files on failure
- RKHunter: Handle non-zero exit codes (warns but continues)
- All scanners log errors and continue to next scanner instead of failing
**Safety Features:**
- Added trap handler for INT/TERM/EXIT signals
- Automatic RKHunter cleanup on any exit (Ctrl+C, error, completion)
- Removed duplicate cleanup code (now handled by trap)
- Added path validation before scanning (checks exist + readable)
- Added disk space check (warns if <100MB available)
- Prompts user to continue if low disk space detected
**Path Validation:**
- Validates all paths exist before scanning
- Checks read permissions on each path
- Skips unreadable/missing paths with warnings
- Logs all path validation results
- Exits if no valid paths remain
**User Experience:**
- Better progress indicators (Scanner X of Y: Name)
- Clearer error messages with context
- Warnings for signature update failures
- Logs all errors for debugging
- Scan continues even if one scanner fails
**Robustness:**
- Graceful handling of Ctrl+C interruption
- Saves "SCAN INTERRUPTED" status to summary
- Cleanup guaranteed via trap handler
- No orphaned processes or temp files
- Proper exit codes logged
**Before:**
- No error handling (scans failed silently)
- No cleanup on interruption
- RKHunter could be left installed
- No path validation
- No disk space checking
- Scanner failures caused whole scan to fail
**After:**
- Comprehensive error handling for all operations
- Guaranteed cleanup on any exit
- Path validation with helpful warnings
- Disk space checking with user prompt
- Scanners run independently (one failure doesn't stop others)
- All errors logged with context
Testing: Syntax validated, ready for production use
cschantz
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