Synology SRM System Backup Repository

This repository contains a backup of the Synology SRM (Synology Router Manager) operating system, originating from a Synology router. The purpose of this repository is to conduct detailed analysis, documentation, and understanding of the internal structure and operation of the SRM system.

Directory Structure in srm_backup/

The srm_backup/ directory contains key components of the Synology SRM system, organized as follows:

• bin/: Contains executable files (binaries) and system scripts. These are the basic tools and programs necessary for system operation.
• data/: Stores application data, temporary data files, and other resources used by the system and installed packages.
• etc/: This directory contains the main system configuration files. Changes to these files directly affect system behavior.
• etc.defaults/: Stores default configuration files. These are templates that the system uses to restore settings or initialize new components.
• ini/: Likely contains additional initialization or configuration files for specific modules.
• initrd/: Initial RAM disk image, used during the system boot process. It contains a minimal set of tools and drivers needed to load the main file system.
• lib/: Shared libraries required by system programs and applications. Examples include libapr-1.so, libboost_regex.so, libdbus-1.so, libicui18n.so, libip6tc.so, libkadm5clnt_mit.so, liblber-2.4.so, libpq.so, libsynoglusterfs-dsm.so, libsynoportmap.so, libsynowifidaemon.so, libsyslog-ng-3.5.5.so, libtalloc.so.
• lost+found/: A standard Linux file system directory, storing recovered file fragments after system crashes.
• mnt/: Empty mount points for temporary file systems or external devices.
• root/: The home directory for the root user, containing configuration files and scripts specific to the administrator (.profile, .wget-hsts).
• run/: Contains temporary files, process IDs (PID files), socket files, and other runtime data. Examples include crond.pid, dhcp-server.pid, dnsmasq.pid, sshd.pid, synoconfd.pid, access rule files (access_srm_rules_v4, access_srm_rules_v6), and subdirectories such as avahi-daemon/, ddns/, httpd/, ipset/, lock/, ngfw/, samba/, sudo/, synoservice/, udev/.
• sbin/: Contains system executable files, primarily for system administration.
• usr/: Contains user files, including programs, libraries, and documentation used by users and applications.
• var/: Stores variable data such as log files, spool, temporary files, and other data that changes during system operation.
• var.defaults/: Default variable data, similar to var/ but containing initial or resettable configurations. A notable element is dynlib/securityscan/ruleDB/, which contains security scan rules, including Python scripts for configuration verification (DirectoryService, FileService, Malware, Network, PublicAccess, Security, SharedFolder, SystemCheck, Terminal, Update, User).
• volume1/: Likely the mount point for the router's main storage volume, where user data and packages are stored.

Documentation Goal

The primary goal of this repository is to create comprehensive documentation for the Synology SRM system, which will allow for:

• Understanding the system architecture.
• Identification of key components and their functions.
• Analysis of security mechanisms and network configurations.
• Facilitation of potential research or development work related to the SRM system.

Detailed documentation will be placed in the _documentation/ directory and will be divided into subdirectories corresponding to the main areas of the system.