From ffe551fdbbade14e1a8de84ac48064aa7b45e2c1 Mon Sep 17 00:00:00 2001
From: antialias <antialias@leap.se>
Date: Mon, 10 Sep 2012 19:59:30 -0400
Subject: Implemented basic networks checks: valid interface, default route,
 and can ping the listed gateway.

---
 pkg/requirements.pip              |  1 +
 src/leap/eip/checks.py            | 53 +++++++++++++++++++++++++++++++++++++--
 src/leap/eip/exceptions.py        | 13 ++++++++++
 src/leap/eip/tests/test_checks.py | 26 ++++++++++++++++++-
 4 files changed, 90 insertions(+), 3 deletions(-)

diff --git a/pkg/requirements.pip b/pkg/requirements.pip
index 96e76d34..e201906f 100644
--- a/pkg/requirements.pip
+++ b/pkg/requirements.pip
@@ -1,3 +1,4 @@
 argparse
 configuration
+ping
 requests
diff --git a/src/leap/eip/checks.py b/src/leap/eip/checks.py
index 4a2a9599..412be27b 100644
--- a/src/leap/eip/checks.py
+++ b/src/leap/eip/checks.py
@@ -1,7 +1,10 @@
 import logging
 import ssl
+import platform
 import os
 
+import netifaces
+import ping
 import requests
 
 from leap.base import constants as baseconstants
@@ -319,8 +322,54 @@ class EIPConfigChecker(object):
         # We should WRITE eip config if missing or
         # incomplete at this point
 
-    def ping_gateway(self):
-        raise NotImplementedError
+    def test_internet_connection(self):
+        try:
+            requests.get('http://216.172.161.165')
+        except (requests.HTTPError, requests.RequestException) as e:
+            self.error = e.message
+        except requests.ConenctionError as e:
+            if e.message == "[Errno 113] No route to host":
+                if not self.is_internet_up():
+                    self.error = "No valid internet connection found."
+                else:
+                    self.error = "Provider server appears to be down."
+
+    def is_internet_up(self):
+        iface, gateway = self.get_default_interface_gateway()
+        self.ping_gateway(self)
+
+    def get_default_interface_gateway(self):
+        """only impletemented for linux so far."""
+        if not platform.system() == "Linux":
+            raise NotImplementedError
+
+        f = open("/proc/net/route")
+        route_table = f.readlines()
+        #toss out header
+        route_table.pop(0)
+
+        default_iface = None
+        gateway = None
+        while route_table:
+            line = route_table.pop(0)
+            iface, destination, gateway = line.split('\t')[0:3]
+            if destination == '00000000':
+                default_iface = iface
+                break
+
+        if not default_iface:
+            raise eipexceptions.NoDefaultInterfaceFoundError
+
+        if default_iface not in netifaces.interfaces():
+            raise eipexceptions.InterfaceNotFoundError
+
+        return default_iface, gateway
+
+    def ping_gateway(self, gateway):
+        #TODO: Discuss how much packet loss (%) is acceptable.
+        packet_loss = ping.quiet_ping(gateway)[0]
+        if packet_loss > 10:
+            raise eipexceptions.NoConnectionToGateway
 
     #
     # private helpers
diff --git a/src/leap/eip/exceptions.py b/src/leap/eip/exceptions.py
index 3c8f6afb..4d0d70e2 100644
--- a/src/leap/eip/exceptions.py
+++ b/src/leap/eip/exceptions.py
@@ -108,6 +108,19 @@ class EIPInitBadProviderError(EIPClientError):
 class EIPConfigurationError(EIPClientError):
     pass
 
+
+class NoDefaultInterfaceFoundError(EIPClientError):
+    pass
+
+
+class InterfaceNotFoundError(EIPClientError):
+    pass
+
+
+class NoConnectionToGateway(EIPClientError):
+    pass
+
+
 #
 # Errors that probably we don't need anymore
 # chase down for them and check.
diff --git a/src/leap/eip/tests/test_checks.py b/src/leap/eip/tests/test_checks.py
index 0a87f573..1edcdfb2 100644
--- a/src/leap/eip/tests/test_checks.py
+++ b/src/leap/eip/tests/test_checks.py
@@ -8,8 +8,10 @@ except ImportError:
 import os
 import urlparse
 
-from mock import patch, Mock
+from StringIO import StringIO
+from mock import patch, Mock, MagicMock
 
+import ping
 import requests
 
 from leap.base import config as baseconfig
@@ -23,6 +25,8 @@ from leap.testing.basetest import BaseLeapTest
 from leap.testing.https_server import BaseHTTPSServerTestCase
 from leap.testing.https_server import where as where_cert
 
+_uid = os.getuid()
+
 
 class NoLogRequestHandler:
     def log_message(self, *args):
@@ -170,6 +174,26 @@ class EIPCheckTest(BaseLeapTest):
         sampleconfig = copy.copy(testdata.EIP_SAMPLE_JSON)
         checker.check_complete_eip_config(config=sampleconfig)
 
+    def test_get_default_interface_no_interface(self):
+        checker = eipchecks.EIPConfigChecker()
+        with patch('leap.eip.checks.open', create=True) as mock_open:
+            with self.assertRaises(eipexceptions.NoDefaultInterfaceFoundError):
+                mock_open.return_value = \
+                    StringIO("Iface\tDestination Gateway\tFlags\tRefCntd\tUse\tMetric\tMask\tMTU\tWindow\tIRTT")
+                checker.get_default_interface_gateway()
+
+    def test_ping_gateway_fail(self):
+        checker = eipchecks.EIPConfigChecker()
+        with patch.object(ping, "quiet_ping") as mocked_ping:
+            with self.assertRaises(eipexceptions.NoConnectionToGateway):
+                mocked_ping.return_value = [11, "", ""]
+                checker.ping_gateway("4.2.2.2")
+
+    @unittest.skipUnless(_uid == 0, "root only")
+    def test_ping_gateway(self):
+        checker = eipchecks.EIPConfigChecker()
+        checker.ping_gateway("4.2.2.2")
+
 
 class ProviderCertCheckerTest(BaseLeapTest):
 
-- 
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