Moved a function into common, since Monkey doesn't have ring as a dependency

Also renamed it and added UTs

monkey/common/network/network_utils.py

@@ -0,0 +1,12 @@
+from urllib.parse import urlparse
+
+
+def get_host_from_network_location(network_location: str) -> str:
+    """
+    URL structure is "<scheme>://<net_loc>/<path>;<params>?<query>#<fragment>" (https://tools.ietf.org/html/rfc1808.html)
+    And the net_loc is "<user>:<password>@<host>:<port>" (https://tools.ietf.org/html/rfc1738#section-3.1)
+    :param network_location:  server network location
+    :return:  host part of the network location
+    """
+    url = urlparse("http://" + network_location)
+    return str(url.hostname)

monkey/common/network/test_network_utils.py

@@ -0,0 +1,12 @@
+from unittest import TestCase
+
+from common.network.network_utils import get_host_from_network_location
+
+
+class TestNetworkUtils(TestCase):
+    def test_remove_port_from_ip_string(self):
+        assert get_host_from_network_location("127.0.0.1:12345") == "127.0.0.1"
+        assert get_host_from_network_location("127.0.0.1:12345") == "127.0.0.1"
+        assert get_host_from_network_location("127.0.0.1") == "127.0.0.1"
+        assert get_host_from_network_location("www.google.com:8080") == "www.google.com"
+        assert get_host_from_network_location("user:password@host:8080") == "host"

monkey/infection_monkey/monkey.py

@@ -33,7 +33,7 @@ from infection_monkey.telemetry.attack.t1106_telem import T1106Telem
 from common.utils.attack_utils import ScanStatus, UsageEnum
 from common.version import get_version
 from infection_monkey.exploit.HostExploiter import HostExploiter
-from monkey_island.cc.network_utils import remove_port_from_ip_string
+from common.network.network_utils import get_host_from_network_location
 
 MAX_DEPTH_REACHED_MESSAGE = "Reached max depth, shutting down"
 
@@ -386,7 +386,7 @@ class InfectionMonkey(object):
         LOG.debug("default server set to: %s" % self._default_server)
 
     def is_started_on_island(self):
-        island_ip = remove_port_from_ip_string(self._default_server)
+        island_ip = get_host_from_network_location(self._default_server)
         return is_running_on_server(island_ip) and WormConfiguration.depth == WormConfiguration.max_depth
 
     def log_arguments(self):

monkey/monkey_island/cc/network_utils.py

@@ -5,7 +5,6 @@ import socket
 import struct
 import sys
 from typing import List
-from urllib.parse import urlparse
 
 from netifaces import interfaces, ifaddresses, AF_INET
 from ring import lru
@@ -86,8 +85,3 @@ def get_subnets():
             ]
         )
     return subnets
-
-
-def remove_port_from_ip_string(ip_string: str) -> str:
-    url = urlparse("http://" + ip_string)
-    return str(url.hostname)