File _service of Package vsftpd

<services>
  <service name="download_url">
    <param name="protocol">https</param>
    <param name="host">security.appspot.com</param>
    <param name="path">/downloads/vsftpd-2.3.4.tar.gz</param>
  </service>
  <service name="verify_file">
    <param name="file">_service:download_url:vsftpd-2.3.4.tar.gz</param>
    <param name="verifier">sha256</param>
    <param name="checksum">b466edf96437afa2b2bea6981d4ab8b0204b83ca0a2ac94bef6b62b42cc71a5a</param>
  </service>
</services>