MRCI/README.md

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# MRCI #
(Modular Remote Command Interpreter) is a command interpreter primarily designed to provide any type of remote service to connected clients. As the name implies, it is expandable via 3rd party modules by adding additional commands that remote clients can run on the host. It has a fully featured user account management system with access control to certain commands for certain users.
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### Usage ###
```
Usage: mrci <argument>
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<Arguments>
-help : display usage information about this application.
-stop : stop the current host instance if one is currently running.
-about : display versioning/warranty information about this application.
-status : display status information about the host instance if it is currently running.
-host : start a new host instance. (this blocks)
-host_trig : start a new host instance. (this does not block)
-public_cmds : run the internal module to list it's public commands. for internal use only.
-exempt_cmds : run the internal module to list it's rank exempt commands. for internal use only.
-user_cmds : run the internal module to list it's user commands. for internal use only.
-run_cmd : run an internal module command. for internal use only.
-ls_sql_drvs : list all available SQL drivers that the host currently supports.
-load_ssl : re-load the host SSL certificate without stopping the host instance.
Slimmed down and simplified host administering - I decided to remove the entire concept of a root user. Instead, the host initializes as a blank slate and it will be up to the host admin to create a rank 1 user via the new command line option "-add_admin" to do initial setup with. - There is no longer such a concept as a protected user. Meaning even the last rank 1 user in the host database is allowed to delete or modify the rank of their own account. To prevent permanent "admin lock out" in this scenario the "-elevate" command line option was created. - Host settings are no longer stored in the database. Instead, host settings are now stored in a conf.json file in /etc/mrci/conf.json if running on a linux based OS or in %Programdata%\mrci\conf.json if running on Windows. - Email templates are no longer stored in the database. Instead, the templates can be any file formatted in UTF-8 text stored in the host file system. The files they point to can be modified in the conf.json file. - The conf file also replaced all use env variables so MRCI_DB_PATH, MRCI_WORK_DIR, MRCI_PRIV_KEY and MRCI_PUB_KEY are no longer in use. SSL/TLS cert paths can be modified in the conf file. - Removed email template cmds set_email_template and preview_email. - Also removed cmds close_host, host_config and restart_host. The actions these commands could do is best left to the host system command line. - The database class will now explicitly check for write permissions to the database and throw an appropriate error message if the check fails. "DROP TABLE" SQL abilities were added to make this happen. - Removed async cmds exit(3), maxses(5) and restart(11).
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-elevate : elevate any user account to rank 1.
-res_pw : reset a user account password with a randomized one time password.
Slimmed down and simplified host administering - I decided to remove the entire concept of a root user. Instead, the host initializes as a blank slate and it will be up to the host admin to create a rank 1 user via the new command line option "-add_admin" to do initial setup with. - There is no longer such a concept as a protected user. Meaning even the last rank 1 user in the host database is allowed to delete or modify the rank of their own account. To prevent permanent "admin lock out" in this scenario the "-elevate" command line option was created. - Host settings are no longer stored in the database. Instead, host settings are now stored in a conf.json file in /etc/mrci/conf.json if running on a linux based OS or in %Programdata%\mrci\conf.json if running on Windows. - Email templates are no longer stored in the database. Instead, the templates can be any file formatted in UTF-8 text stored in the host file system. The files they point to can be modified in the conf.json file. - The conf file also replaced all use env variables so MRCI_DB_PATH, MRCI_WORK_DIR, MRCI_PRIV_KEY and MRCI_PUB_KEY are no longer in use. SSL/TLS cert paths can be modified in the conf file. - Removed email template cmds set_email_template and preview_email. - Also removed cmds close_host, host_config and restart_host. The actions these commands could do is best left to the host system command line. - The database class will now explicitly check for write permissions to the database and throw an appropriate error message if the check fails. "DROP TABLE" SQL abilities were added to make this happen. - Removed async cmds exit(3), maxses(5) and restart(11).
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-add_admin : create a rank 1 account with a randomized password.
Internal module | -public_cmds, -user_cmds, -exempt_cmds, -run_cmd |:
-pipe : the named pipe used to establish a data connection with the session.
-mem_ses : the shared memory key for the session.
-mem_host : the shared memory key for the host main process.
Details:
res_pw - this argument takes a single string representing a user name to reset the password. the host
will set a randomized password and display it on the CLI.
example: -res_pw somebody
Slimmed down and simplified host administering - I decided to remove the entire concept of a root user. Instead, the host initializes as a blank slate and it will be up to the host admin to create a rank 1 user via the new command line option "-add_admin" to do initial setup with. - There is no longer such a concept as a protected user. Meaning even the last rank 1 user in the host database is allowed to delete or modify the rank of their own account. To prevent permanent "admin lock out" in this scenario the "-elevate" command line option was created. - Host settings are no longer stored in the database. Instead, host settings are now stored in a conf.json file in /etc/mrci/conf.json if running on a linux based OS or in %Programdata%\mrci\conf.json if running on Windows. - Email templates are no longer stored in the database. Instead, the templates can be any file formatted in UTF-8 text stored in the host file system. The files they point to can be modified in the conf.json file. - The conf file also replaced all use env variables so MRCI_DB_PATH, MRCI_WORK_DIR, MRCI_PRIV_KEY and MRCI_PUB_KEY are no longer in use. SSL/TLS cert paths can be modified in the conf file. - Removed email template cmds set_email_template and preview_email. - Also removed cmds close_host, host_config and restart_host. The actions these commands could do is best left to the host system command line. - The database class will now explicitly check for write permissions to the database and throw an appropriate error message if the check fails. "DROP TABLE" SQL abilities were added to make this happen. - Removed async cmds exit(3), maxses(5) and restart(11).
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add_admin - this argument takes a single string representing a user name to create a rank 1 account with.
the host will set a randomized password for it and display it on the CLI. this user will be
required to change the password upon logging in.
example: -add_admin somebody
elevate - this argument takes a single string representing a user name to an account to promote to rank 1.
example: -elevate somebody
run_cmd - this argument is used by the host itself, along side the internal module arguments below to run
the internal command names passed by it. this is not meant to be run directly by human input.
the executable will auto close if it fails to connect to the pipe and/or shared memory segments
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```
Slimmed down and simplified host administering - I decided to remove the entire concept of a root user. Instead, the host initializes as a blank slate and it will be up to the host admin to create a rank 1 user via the new command line option "-add_admin" to do initial setup with. - There is no longer such a concept as a protected user. Meaning even the last rank 1 user in the host database is allowed to delete or modify the rank of their own account. To prevent permanent "admin lock out" in this scenario the "-elevate" command line option was created. - Host settings are no longer stored in the database. Instead, host settings are now stored in a conf.json file in /etc/mrci/conf.json if running on a linux based OS or in %Programdata%\mrci\conf.json if running on Windows. - Email templates are no longer stored in the database. Instead, the templates can be any file formatted in UTF-8 text stored in the host file system. The files they point to can be modified in the conf.json file. - The conf file also replaced all use env variables so MRCI_DB_PATH, MRCI_WORK_DIR, MRCI_PRIV_KEY and MRCI_PUB_KEY are no longer in use. SSL/TLS cert paths can be modified in the conf file. - Removed email template cmds set_email_template and preview_email. - Also removed cmds close_host, host_config and restart_host. The actions these commands could do is best left to the host system command line. - The database class will now explicitly check for write permissions to the database and throw an appropriate error message if the check fails. "DROP TABLE" SQL abilities were added to make this happen. - Removed async cmds exit(3), maxses(5) and restart(11).
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The host can be managed via a connected client that supports text input/output so the host application is always listening for clients while running entirely in the background. By default the host listen for clients on address 0.0.0.0 and port 35516, effectively making it reachable on any network interface of the host platform via that specific port.
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### More Than Just a Command Interpreter ###
Typical use for a MRCI host is to run commands on a remote host that clients ask it to run, very similar to what you see in remote terminal emulators. It however does have a few features typically not seen in terminals:
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* Broadcast any type of data to all peers connected to the host.
* Run remote commands on connected peers.
* Host object positioning data for peers (online games do this).
* Send data to/from a peer client directly.
* Fully featured user account management system.
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* Built in permissions and command access management.
* Host limits management (max concurrent users, max failed password attempts, etc...).
* Account recovery emailing in case of forgotten passwords. **
* Access to various logs.
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* Built in host file management (copy, move, delete, etc...).
* Built in file upload/download support.
Because the host is modular, the things you can customize it to do is almost limitless by simply adding more commands.
** The email system of this application depends on external email clients that run on the command line. The default is [mutt](http://www.mutt.org/). If you want emails to work out of the box, consider installing and configuring mutt. It just needs to be configured with a smtp account to send emails with. You don't have to use mutt though, the host does have the option to change the email client to any other application that has a command line interface.
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### Documentation ###
* [1.1 The Protocol](docs/protocol.md)
* [2.1 Modules](docs/modules.md)
* [3.1 Type IDs](docs/type_ids.md)
* [4.1 Host Features](docs/host_features.md)
* [5.1 Async Commands](docs/async.md)
* [6.1 Shared Memory](docs/shared_data.md)
* [7.1 Internal Commands](docs/intern_commands.md)
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### Build Setup ###
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For Linux you need the following packages to successfully build/install:
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```
qtbase5-dev
libssl-dev
gcc
make
python3
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```
For Windows support you need to have the following applications installed:
```
OpenSSL
Qt5.12 or newer
Python3
```
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### Build ###
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To build this project from source you just need to run the build.py and then the install.py python scripts. While running the build the script, it will try to find the Qt API installed in your machine according to the PATH env variable. If not found, it will ask you to input where it can find the Qt bin folder where the qmake executable exists or you can bypass all of this by passing the -qt_dir option on it's command line.
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while running the install script, it will ask you to input 1 of 3 options:
***local machine*** - This option will install the built application onto the local machine without creating an installer.
***create installer*** - This option creates an installer that can be distributed to other machines for installation. The resulting installer is just a regular .py script file that the target machine can run if it has Python3 installed. Only Python3 needs to be installed and an internet connection is not required.
***exit*** - Cancel the installation.
-local or -installer can be passed as command line options for install.py to explicitly select one of the above options without pausing for user input.
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### Services ###
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If a target linux system supports systemd, the application will be installed as a background daemon that can start/stop with the following commands:
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```
sudo systemctl start mrci
sudo systemctl stop mrci
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```
In a Windows system, a scheduled task will be created to auto start the application in the background when the system starts.