tests: Use shell in local cmd_execute() only if needed

The generic cmd_execute() function was introduced in a manner that
converted the argument array to a string and used shell to run the
command unconditionally. This is not really desirable, so move back to
using the command array by default and use the single command string
with a shell only when really needed.

Signed-off-by: Jouni Malinen <j@w1.fi>

tests/hwsim/hostapd.py

@@ -42,11 +42,14 @@ class HostapdGlobal:
             self.dbg = hostname + "/" + str(port)
         self.mon.attach()
 
-    def cmd_execute(self, cmd_array):
+    def cmd_execute(self, cmd_array, shell=False):
         if self.hostname is None:
-            cmd = ' '.join(cmd_array)
+            if shell:
+                cmd = ' '.join(cmd_array)
+            else:
+                cmd = cmd_array
             proc = subprocess.Popen(cmd, stderr=subprocess.STDOUT,
-                                    stdout=subprocess.PIPE, shell=True)
+                                    stdout=subprocess.PIPE, shell=shell)
             out = proc.communicate()[0]
             ret = proc.returncode
             return ret, out
@@ -146,14 +149,14 @@ class Hostapd:
         self.bssid = None
         self.bssidx = bssidx
 
-    def cmd_execute(self, cmd_array):
+    def cmd_execute(self, cmd_array, shell=False):
         if self.hostname is None:
-            cmd = ""
-            for arg in cmd_array:
-                cmd += arg + " "
-            cmd = cmd.strip()
+            if shell:
+                cmd = ' '.join(cmd_array)
+            else:
+                cmd = cmd_array
             proc = subprocess.Popen(cmd, stderr=subprocess.STDOUT,
-                                    stdout=subprocess.PIPE, shell=True)
+                                    stdout=subprocess.PIPE, shell=shell)
             out = proc.communicate()[0]
             ret = proc.returncode
             return ret, out
@@ -588,6 +591,6 @@ def ht40_minus_params(channel="1", ssid=None, country=None):
     params['ht_capab'] = "[HT40-]"
     return params
 
-def cmd_execute(apdev, cmd):
+def cmd_execute(apdev, cmd, shell=False):
     hapd_global = HostapdGlobal(apdev)
-    return hapd_global.cmd_execute(cmd)
+    return hapd_global.cmd_execute(cmd, shell=shell)

tests/hwsim/test_ap_ciphers.py

@@ -86,12 +86,14 @@ def test_ap_cipher_tkip_countermeasures_ap(dev, apdev):
                    pairwise="TKIP", group="TKIP", scan_freq="2412")
 
     dev[0].dump_monitor()
-    dev[0].cmd_execute([ "echo", "-n", apdev[0]['bssid'], ">", testfile ])
+    dev[0].cmd_execute([ "echo", "-n", apdev[0]['bssid'], ">", testfile ],
+                       shell=True)
     ev = dev[0].wait_event(["CTRL-EVENT-DISCONNECTED"], timeout=1)
     if ev is not None:
         raise Exception("Unexpected disconnection on first Michael MIC failure")
 
-    dev[0].cmd_execute([ "echo", "-n", "ff:ff:ff:ff:ff:ff", ">", testfile ])
+    dev[0].cmd_execute([ "echo", "-n", "ff:ff:ff:ff:ff:ff", ">", testfile ],
+                       shell=True)
     ev = dev[0].wait_disconnected(timeout=10,
                                   error="No disconnection after two Michael MIC failures")
     if "reason=14" not in ev:
@@ -118,12 +120,14 @@ def test_ap_cipher_tkip_countermeasures_sta(dev, apdev):
                    pairwise="TKIP", group="TKIP", scan_freq="2412")
 
     dev[0].dump_monitor()
-    hapd.cmd_execute([ "echo", "-n", dev[0].own_addr(), ">", testfile ])
+    hapd.cmd_execute([ "echo", "-n", dev[0].own_addr(), ">", testfile ],
+                     shell=True)
     ev = dev[0].wait_event(["CTRL-EVENT-DISCONNECTED"], timeout=1)
     if ev is not None:
         raise Exception("Unexpected disconnection on first Michael MIC failure")
 
-    hapd.cmd_execute([ "echo", "-n", "ff:ff:ff:ff:ff:ff", ">", testfile ])
+    hapd.cmd_execute([ "echo", "-n", "ff:ff:ff:ff:ff:ff", ">", testfile ],
+                     shell=True)
     ev = dev[0].wait_disconnected(timeout=10,
                                   error="No disconnection after two Michael MIC failures")
     if "reason=14 locally_generated=1" not in ev:

tests/hwsim/wpasupplicant.py

@@ -49,11 +49,14 @@ class WpaSupplicant:
         else:
             self.global_mon = None
 
-    def cmd_execute(self, cmd_array):
+    def cmd_execute(self, cmd_array, shell=False):
         if self.hostname is None:
-            cmd = ' '.join(cmd_array)
+            if shell:
+                cmd = ' '.join(cmd_array)
+            else:
+                cmd = cmd_array
             proc = subprocess.Popen(cmd, stderr=subprocess.STDOUT,
-                                    stdout=subprocess.PIPE, shell=True)
+                                    stdout=subprocess.PIPE, shell=shell)
             out = proc.communicate()[0]
             ret = proc.returncode
             return ret, out