search for: 24922branch

...c), and they run the rsync daemon (under File Services). rsync is an integral part of their solution. They use a modified build of rsync (seemingly 3.0.9 + cherrypicked CVE fixes) for which they do provide some sources (see https://sourceforge.net/projects/dsgpl/files/Synology%20NAS%20GPL%20Source/24922branch/x64-source/ and search for "rsync"), and if you spend your afternoon tracking down all the needed packages/downloads and reconcile the missing headers, it builds "something". However, this "something" is not the rsync they ship on the boxes or provide in their updates...