Riley 0.5

Riley is a file integrity checker written in Perl,somewhat similar to Tripwire.
Running riley -initialize puts a file called .riley in each directory specified in the configuration file. Each .riley file contains N one-line descriptions, one description per file. Each description contains the name of the file, type, size, owner, group,
permissions, and number of links. If the file is a regular file, each description also contains an MD5 checksum of the contents of the file. Each .riley file also contains a MD5 checksum of the file itself to forestall tampering.
Running riley -examine compares the current state of every file against the description created earlier by running riley -initialize. If anything has changed, it notes the change both in the system log file and via email. It is noticing the existance of new files as well as the non-existance of deleted files.
If youre feeling paranoid, you can run riley -correct instead of riley -examine. Doing this changes the permissions/ownership of changed files back to what the description file says they should be. riley -correct treats new files suspiciously, changing their ownership/
group to nobody/nobody (99/99 on most RedHat systems), and their permissions to 0. If you dont want to use nobody/nobody, change the values of the global variables $unpriv_u and $unpriv_g to something else, perhaps an owner/group youve specifically created for the occasion.
Enhancements:
- added code to handle dangling symlinks (thanks to chad townsend)
- added code to print usage when option "-help" given
- minor cosmetic fixes (removed un-used variables, added comments)
- added code to install program to check for "chattr"