Obtaining source from yum repo in CentOS 7

Firstly ensure that you have the relevant sources configured in your yum.repos.d folder.

Lets firstly obtain the latest freeradius sources from the epel repo:

yumdownloader source freeradius

We can use the rpm2cpio utility to extract the files from the rpm package, while piping it into cpio to examine the contents of the rpm package:

rpm2cpio freeradius-3.0.4-7.el7_3.src.rpm | cpio -it

freeradius-Don-t-overwrite-ip_hton-af-prefix-in-fr_pton4-6.patch
freeradius-Rename-lt_-symbols-to-fr_.patch
freeradius-Resolve-to-all-families-on-ip_hton-fallback.patch
freeradius-access-union-consistently.patch
freeradius-add-P-option-to-radtest-synopsis.patch

freeradius-server-3.0.4.tar.bz2

...

From the output we can a bunch of patches and the server source itself.

To extract them to the current directory we issue:

rpm2cpio freeradius-3.0.4-7.el7_3.src.rpm | cpio -idmv