tests: Add a test for dynamic hostapd config change

test_ap_change_ssid verifies that the SET and RELOAD control interface
commands can be used to change the SSID of a hostapd-controlled WPA2-PSK
AP, i.e., for a case where the PSK needs to be derived again after the
SSID change.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

tests/hwsim/test_ap_dynamic.py

@@ -0,0 +1,35 @@
+#!/usr/bin/python
+#
+# Test cases for dynamic BSS changes with hostapd
+# Copyright (c) 2013, Qualcomm Atheros, Inc.
+#
+# This software may be distributed under the terms of the BSD license.
+# See README for more details.
+
+import time
+import subprocess
+import logging
+logger = logging.getLogger(__name__)
+
+import hwsim_utils
+import hostapd
+
+def test_ap_change_ssid(dev, apdev):
+    """Dynamic SSID change with hostapd and WPA2-PSK"""
+    params = hostapd.wpa2_params(ssid="test-wpa2-psk-start",
+                                 passphrase="12345678")
+    hostapd.add_ap(apdev[0]['ifname'], params)
+    id = dev[0].connect("test-wpa2-psk-start", psk="12345678")
+    dev[0].request("DISCONNECT")
+
+    logger.info("Change SSID dynamically")
+    hapd = hostapd.Hostapd(apdev[0]['ifname'])
+    res = hapd.request("SET ssid test-wpa2-psk-new")
+    if "OK" not in res:
+        raise Exception("SET command failed")
+    res = hapd.request("RELOAD")
+    if "OK" not in res:
+        raise Exception("RELOAD command failed")
+
+    dev[0].set_network_quoted(id, "ssid", "test-wpa2-psk-new")
+    dev[0].connect_network(id)

tests/hwsim/wpasupplicant.py

@@ -554,6 +554,7 @@ class WpaSupplicant:
         else:
             self.dump_monitor()
             self.select_network(id)
+        return id
 
     def scan(self, type=None):
         if type: