Use subprocess.STDOUT other than subprocess.OUTPUT in the Cygwin;

When get ipv6 route table, netsh return interface index other than
name in the Windows 7.

re6st/tunnel.py

@@ -305,19 +305,36 @@ class TunnelManager(object):
 
     if sys.platform == 'cygwin':
         def _iterRoutes(self):
+            interface_dict = {}
+            interfaces = subprocess.check_output(
+                ('netsh', 'interface', 'ipv6', 'show', 'interface'),
+                stderr=subprocess.STDOUT)
+            for line in interfaces.splitlines():
+                if not line == '':
+                    fs = line.split(None, 4)
+                    if fs[0].isdigit():
+                        interface_dict[fs[0].strip()] = fs[4].strip()
             routing_table = subprocess.check_output(
                 ('netsh', 'interface', 'ipv6', 'show', 'route', 'verbose'),
-                stderr=subprocess.OUTPUT)
-            pname = 'Prefix' if platform.system()[10:11] == '5' else 'Destination Prefix'
+                stderr=subprocess.STDOUT)
+            # Before Vista
+            if platform.system()[10:11] == '5':
+                pname = 'Prefix'
+                ifname = lambda a : a
+            # From Vista later
+            else:
+                pname = 'Destination Prefix'
+                ifname = interface_dict.get
             for line in routing_table.splitlines():
                 fs = line.split(':', 1)
                 test = fs[0].startswith
                 if test(pname):
                     prefix, prefix_len = fs[1].split('/', 1)
                 elif test('Interface'):
-                    yield (fs[1].strip(),
-                           utils.binFromIp(prefix),
-                           int(prefix_len))
+                    yield (ifname(fs[1].strip()),
+                        prefix,
+                        int(prefix_len))
+
     else:
         def _iterRoutes(self):
             with open('/proc/net/ipv6_route') as f: