Merge pull request #980 from zdc/T3763-sagitta

wireguard: T3763: Added check for listening port availability

1 files changed, 8 insertions, 0 deletions

diff --git a/src/conf_mode/interfaces-wireguard.py b/src/conf_mode/interfaces-wireguard.py
index 4c566a5ad..68181465e 100755
--- a/src/conf_mode/interfaces-wireguard.py
+++ b/src/conf_mode/interfaces-wireguard.py
@@ -30,6 +30,7 @@ from vyos.configverify import verify_bridge_delete
 from vyos.configverify import verify_mtu_ipv6
 from vyos.ifconfig import WireGuardIf
 from vyos.util import check_kmod
+from vyos.util import check_port_availability
 from vyos import ConfigError
 from vyos import airbag
 airbag.enable()
@@ -73,6 +74,13 @@ def verify(wireguard):
     if 'peer' not in wireguard:
         raise ConfigError('At least one Wireguard peer is required!')
 
+    listen_port = int(wireguard['port'])
+    if 'port' in wireguard and check_port_availability('0.0.0.0', listen_port,
+                                                       'udp') is not True:
+        raise ConfigError(
+            f'The UDP port {listen_port} is busy or unavailable and cannot be used for the interface'
+        )
+
     # run checks on individual configured WireGuard peer
     for tmp in wireguard['peer']:
         peer = wireguard['peer'][tmp]