* gnu/services/vpn.scm (<wireguard-configuration>) [monitor-ips?, monitor-ips-internal]: New fields. * gnu/services/vpn.scm (define-with-source): New syntax. (wireguard-service-name, strip-port/maybe) (ipv4-address?, ipv6-address?, host-name?) (endpoint-host-names): New procedure. (wireguard-monitoring-jobs): Likewise. (wireguard-service-type): Register it. * tests/services/vpn.scm: New file. * Makefile.am (SCM_TESTS): Register it. * doc/guix.texi (VPN Services): Update doc. Reviewed-by: Bruno Victal <mirai@makinata.eu>