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-rw-r--r--python/vyos/util.py39
-rwxr-xr-xsrc/conf_mode/interfaces-wireguard.py5
2 files changed, 44 insertions, 0 deletions
diff --git a/python/vyos/util.py b/python/vyos/util.py
index 8af46a6ee..fc2834a97 100644
--- a/python/vyos/util.py
+++ b/python/vyos/util.py
@@ -819,3 +819,42 @@ def is_systemd_service_running(service):
Copied from: https://unix.stackexchange.com/a/435317 """
tmp = cmd(f'systemctl show --value -p SubState {service}')
return bool((tmp == 'running'))
+
+def check_port_availability(ipaddress, port, protocol):
+ """
+ Check if port is available and not used by any service
+ Return False if a port is busy or IP address does not exists
+ Should be used carefully for services that can start listening
+ dynamically, because IP address may be dynamic too
+ """
+ from socketserver import TCPServer, UDPServer
+ from ipaddress import ip_address
+
+ # verify arguments
+ try:
+ ipaddress = ip_address(ipaddress).compressed
+ except:
+ print(f'The {ipaddress} is not a valid IPv4 or IPv6 address')
+ return
+ if port not in range(1, 65536):
+ print(f'The port number {port} is not in the 1-65535 range')
+ return
+ if protocol not in ['tcp', 'udp']:
+ print(
+ f'The protocol {protocol} is not supported. Only tcp and udp are allowed'
+ )
+ return
+
+ # check port availability
+ try:
+ if protocol == 'tcp':
+ server = TCPServer((ipaddress, port), None, bind_and_activate=True)
+ if protocol == 'udp':
+ server = UDPServer((ipaddress, port), None, bind_and_activate=True)
+ server.server_close()
+ return True
+ except:
+ print(
+ f'The {protocol} port {port} on the {ipaddress} is busy or unavailable'
+ )
+ return False
diff --git a/src/conf_mode/interfaces-wireguard.py b/src/conf_mode/interfaces-wireguard.py
index 4c566a5ad..ad3ddcba2 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 +74,10 @@ def verify(wireguard):
if 'peer' not in wireguard:
raise ConfigError('At least one Wireguard peer is required!')
+ if 'port' in wireguard and check_port_availability(
+ '0.0.0.0', int(wireguard['port']), 'udp') is not True:
+ raise ConfigError('The port cannot be used for the interface')
+
# run checks on individual configured WireGuard peer
for tmp in wireguard['peer']:
peer = wireguard['peer'][tmp]