6.3 KiB
6.3 KiB
MOTDfetch
MOTDfetch is a modular & dynamic MOTD replacement written in Bash and a nice command line information tool for Debian/Ubuntu systems.
MOTD - "message of the day"
Feature used on Unix-like CLI systems to send a common message to all users after a successful login, and just before it executes the login shell.
Newer Unix-like systems may generate the message dynamically when the host boots or a user logs in.
Drawbacks with the current implementation of MOTD with PAM on Debian and Ubuntu are at least 3:
- The SSH client does not decide whether to activate the MOTD.
As it is loaded before the shell login is opened: - User has to wait blindly for the end of the execution if there is a dynamic script.
- Scripts can not check the user sessions status.
MOTDfetch avoids and partially disable the original MOTD implementation, but remains compatible with it for PAM login.
Table of contents
Features
- Usable as a command, a login MOTD or SSH MOTD.
- 8 Core modules.
- Uniform and easily customizable.
- Emphasis of important elements and status by colors, symbols or flashing.
- Notice message upon missing dependencies
- Reduced operation mode fot high load (enforceable).
- Separate system and users configuration files.
- Scripted installation and updates.
- Modules or sections can be disabled.
- Standalone executable modules.
8 Core modules
HEADER module
- decorative banner (custom text or username)
- welcome message with username, date and time
- user mail inbox status
SYSYINFO module
- distribution name, kernel version, uptime
- CPU, cores, load, processes, memory, swap
- hostname, network interface, DNS servers, public IPs/DNS/rDNS records
- custom external API for public IP check
- skip connectivity related tests if the API check fail
- short timeout on dig & curl commands to keep the script snappy
SERVICES module
- check systemd services status
- by service name and user UID if not system
- ⚠️ user cannot check other user's services
FILESYSTEM module
- 2 sections: general filesystems, ZFS filesystems
- name, fs type, usage and size of disk or ZFS pool
- inodes usage and size when relevant
- health status for ZFS
- custom usage threshold for warning hints
TLS module
- check X.509 certificates status with openssl
- accept domain and optional port (443 by default)
- validate name correspondence and expiration date
- skip the test if there is no internet connectivity
- short timeout on openssl command to keep the script snappy
POSTQUEUE module
- postfix deferred queue status
- short timeout on the parsing to keep the script snappy if there is thousands of mails
FAIL2BAN module
- display fail2ban jails status
- ⚠️ need to be executed with root or sudo
USERSLOG module
- display last user logged in
- name, IP and connection range
- if the current user is different, display his last log too
- display currently logged sessions with usernames