Initial commit

install

@@ -0,0 +1,31 @@
+#! /usr/bin/env python3
+
+import os
+from string import Template
+from subprocess import check_call
+
+EXEC       = 'wifi-keepalive.py'
+SERVICE    = 'wifi-keepalive.service'
+SYSTEM_DIR = '/etc/systemd/system'
+
+CURRENT_DIR      = os.path.dirname(os.path.realpath(__file__))
+EXEC_PATH        = os.path.join(CURRENT_DIR, EXEC)
+SERVICE_TEMPLATE = os.path.join(CURRENT_DIR, SERVICE)
+SERVICE_FILE     = os.path.join(SYSTEM_DIR, SERVICE)
+EXEC_START       = f'python3 {EXEC}'
+
+with open(SERVICE_TEMPLATE) as f:
+    serviceTemplate = Template(f.read())
+
+serviceFile = serviceTemplate.substitute(
+    workingDirectory=CURRENT_DIR,
+    execStart=EXEC_START
+)
+
+with open(SERVICE_FILE, 'w') as f:
+    f.write(serviceFile)
+
+check_call(['systemctl', 'daemon-reload'])
+check_call(['systemctl', 'enable', '--no-pager', SERVICE])
+check_call(['systemctl', 'restart', '--no-pager', SERVICE])
+check_call(['systemctl', 'status', '--no-pager', SERVICE])

wifi-keepalive.py

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+from signal import SIGTERM, signal
+from subprocess import CalledProcessError, check_output
+from sys import exit
+from time import sleep
+
+PING_INTERVAL_IN_SECONDS = 80
+
+signal(SIGTERM, lambda signum, frame: exit(0))
+
+
+def getDefaultRoute():
+    routes = check_output(['route', '-n']).decode('utf-8').splitlines()
+    defaults = [r.split()[1] for r in routes if r.startswith('0.0.0.0')]
+
+    return defaults[0] if defaults else None
+
+
+def keepalive(defaultRoute):
+    while True:
+        sleep(PING_INTERVAL_IN_SECONDS)
+        ping(defaultRoute)
+
+
+def ping(address):
+    try:
+        check_output(['ping', '-c', '1', address])
+    except CalledProcessError as e:
+        pass
+
+
+defaultRoute = getDefaultRoute()
+keepalive(defaultRoute) if defaultRoute else print('No default route')

wifi-keepalive.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Wifi Keepalive Service
+After=multi.user.target
+
+[Service]
+Type=simple
+WorkingDirectory=$workingDirectory
+ExecStart=$execStart
+Restart=on-failure
+SyslogIdentifier=wifi-keepalive
+
+[Install]
+WantedBy=multi-user.target