#995 Add link speed in probe responses

Separates probe method into separate ogclient modes (virtual, vdi) so
future supported OS can easily have a tailored probe responses.

Link speed is retrieved using a minimal ethtool command sent using fcntl
module from python.

src/live/ogOperations.py

@@ -9,7 +9,9 @@
 import os
 import json
 import subprocess
+import fcntl, socket, array, struct
 from src.ogClient import ogClient
+from src.ogRest import ThreadState
 
 OG_SHELL = '/bin/bash'
 
@@ -276,3 +278,30 @@ class OgLiveOperations:
         self._restartBrowser(self._url)
 
         return self.parseGetConf(output.decode('utf-8'))
+
+    def probe(self, ogRest):
+        def ethtool(interface):
+            try:
+                ETHTOOL_GSET = 0x00000001
+                SIOCETHTOOL = 0x8946
+                sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+                sockfd = sock.fileno()
+                ecmd = array.array(
+                        "B", struct.pack("I39s", ETHTOOL_GSET, b"\x00" * 39)
+                       )
+                interface = interface.encode("utf-8")
+                ifreq = struct.pack("16sP", interface, ecmd.buffer_info()[0])
+                fcntl.ioctl(sockfd, SIOCETHTOOL, ifreq)
+                res = ecmd.tobytes()
+                speed = struct.unpack("12xH29x", res)[0]
+            except IOError:
+                speed = 0
+            finally:
+                sock.close()
+            return speed
+
+        interface = os.environ['DEVICE']
+        speed = ethtool(interface)
+
+        return {'status': 'OPG' if ogRest.state != ThreadState.BUSY else 'BSY',
+                'speed': speed}

src/ogRest.py

@@ -373,16 +373,20 @@ class ogRest():
 		threading.Thread(target=ogThread.poweroff, args=(self,)).start()
 
 	def process_probe(self, client):
+		try:
+			status = self.operations.probe(self)
+		except:
+			response = restResponse(ogResponses.INTERNAL_ERR)
+			client.send(response.get())
+			return
+
 		json_body = jsonBody()
+		for k, v in status.items():
+			json_body.add_element(k, v)
 
 		if self.state != ThreadState.BUSY:
-			if self.mode == 'live':
-				json_body.add_element('status', 'OPG')
-			elif self.mode == 'virtual':
-				json_body.add_element('status', 'VDI')
 			response = restResponse(ogResponses.OK, json_body)
 		else:
-			json_body.add_element('status', 'BSY')
 			response = restResponse(ogResponses.IN_PROGRESS, json_body)
 
 		client.send(response.get())

src/virtual/ogOperations.py

@@ -600,3 +600,6 @@ class OgVirtualOperations:
             for k, v in device_names.items():
                 f.write(f'{k}={v}\n')
             f.truncate()
+
+    def probe(self, ogRest):
+        return {'status': 'VDI' if ogRest.state != ThreadState.BUSY else 'BSY'}