move _iterRoutes to utils.py

enable default route check

re6st/tunnel.py

@@ -311,34 +311,6 @@ class TunnelManager(object):
                     if self._makeTunnel(*peer):
                         break
 
-    if sys.platform == 'cygwin':
-        def _iterRoutes(self):
-            # Before Vista
-            if platform.system()[10:11] == '5':
-                args = ('netsh', 'interface', 'ipv6', 'show', 'route', 'verbose')
-            else:
-                args = ('ipwin', 'ipv6', 'show', 'route', 'verbose')
-            routing_table = subprocess.check_output(args, stderr=subprocess.STDOUT)
-            for line in routing_table.splitlines():
-                fs = line.split(':', 1)
-                test = fs[0].startswith
-                if test('Prefix'):
-                    prefix, prefix_len = fs[1].split('/', 1)
-                elif test('Interface'):
-                    yield (fs[1].strip(),
-                           utils.binFromIp(prefix.strip()),
-                           int(prefix_len))
-    else:
-        def _iterRoutes(self):
-            with open('/proc/net/ipv6_route') as f:
-                routing_table = f.read()
-            for line in routing_table.splitlines():
-                line = line.split()
-                iface = line[-1]
-                if iface != 'lo' and not (int(line[-2], 16) & RTF_CACHE):
-                    yield (iface, bin(int(line[0], 16))[2:].rjust(128, '0'),
-                                  int(line[1], 16))
-
     def _countRoutes(self):
         logging.debug('Starting to count the routes on each interface...')
         del self._distant_peers[:]

re6st/utils.py

@@ -155,6 +155,50 @@ def binFromSubnet(subnet):
     p, l = subnet.split('/')
     return bin(int(p))[2:].rjust(int(l), '0')
     
+if sys.platform == 'cygwin':
+    def _iterRoutes(self):
+        # Before Vista
+        if platform.system()[10:11] == '5':
+            args = ('netsh', 'interface', 'ipv6', 'show', 'route', 'verbose')
+        else:
+            args = ('ipwin', 'ipv6', 'show', 'route', 'verbose')
+        routing_table = subprocess.check_output(args, stderr=subprocess.STDOUT)
+        for line in routing_table.splitlines():
+            fs = line.split(':', 1)
+            test = fs[0].startswith
+            if test('Prefix'):
+                prefix, prefix_len = fs[1].split('/', 1)
+            elif test('Interface'):
+                yield (fs[1].strip(),
+                        utils.binFromIp(prefix.strip()),
+                        int(prefix_len))
+else:
+    def _iterRoutes():
+        with open('/proc/net/ipv6_route') as f:
+            routing_table = f.read()
+        for line in routing_table.splitlines():
+            line = line.split()
+            iface = line[-1]
+            if 0 < int(line[5], 16) < 1 << 31: # positive metric
+                yield (iface, bin(int(line[0], 16))[2:].rjust(128, '0'),
+                              int(line[1], 16))
+
+_iterRoutes.__doc__ = """Iterates over all routes
+
+    Amongst all returned routes starting with re6st prefix:
+    - one is the local one with our prefix
+    - any route with null prefix will be ignored
+    - other are reachable routes installed by babeld
+    """
+
+def iterRoutes(network, exclude_prefix=None):
+    a = len(network)
+    for iface, ip, prefix_len in _iterRoutes():
+        if ip[:a] == network:
+            prefix = ip[a:prefix_len]
+            if prefix and prefix != exclude_prefix:
+                yield iface, prefix
+
 def decrypt(key_path, data):
     p = subprocess.Popen(
         ('openssl', 'rsautl', '-decrypt', '-inkey', key_path),

re6stnet

@@ -361,7 +361,7 @@ def main():
                         exit(1)
                 t = threading.Thread(target=check_no_default_route)
                 t.daemon = True
-                # t.start()
+                t.start()
 
             if not sys.platform == 'cygwin':
                 ip('route', 'unreachable', *x)