Proxy error handling

- UI will now display notifications in the status bar if the connection
  to the proxy itself is broken. This should give better feedback to
  people who are unfamiliar with tor and misconfigured it
- The proxy error handling in the background was slightly improved as
  well

src/class_outgoingSynSender.py

@@ -203,7 +203,16 @@ class outgoingSynSender(threading.Thread, StoppableThread):
 
                 logger.debug(str(self) + ' connected to ' + str(peer) + ' during an outgoing attempt.')
             except socks.GeneralProxyError as err:
-                if shared.verbose >= 2:
+                if err[0][0] in [7, 8, 9]:
+                    logger.error('Error communicating with proxy: %s', str(err))
+                    shared.UISignalQueue.put((
+                        'updateStatusBar',
+                        tr._translate(
+                            "MainWindow", "Problem communicating with proxy: %1. Please check your network settings.").arg(str(err[0][1]))
+                        ))
+                    self.stop.wait(1)
+                    continue
+                elif shared.verbose >= 2:
                     logger.debug('Could NOT connect to ' + str(peer) + ' during outgoing attempt. ' + str(err))
 
                 deletedPeer = None
@@ -227,13 +236,13 @@ class outgoingSynSender(threading.Thread, StoppableThread):
             except socks.Socks5AuthError as err:
                 shared.UISignalQueue.put((
                     'updateStatusBar', tr._translate(
-                    "MainWindow", "SOCKS5 Authentication problem: %1").arg(str(err))))
+                    "MainWindow", "SOCKS5 Authentication problem: %1. Please check your SOCKS5 settings").arg(str(err))))
             except socks.Socks5Error as err:
-                if err[0] in [3, 4, 5, 6]:
+                if err[0][0] in [3, 4, 5, 6]:
                     # this is a more bening "error": host unreachable, network unreachable, connection refused, TTL expired
-                    logger.debug('SOCKS5 error. ' + str(err))
+                    logger.debug('SOCKS5 error: %s', str(err))
                 else:
-                    logger.error('SOCKS5 error. ' + str(err))
+                    logger.error('SOCKS5 error: %s', str(err))
             except socks.Socks4Error as err:
                 logger.error('Socks4Error: ' + str(err))
             except socket.error as err:

src/helper_bootstrap.py

@@ -85,6 +85,7 @@ def dns():
                 sock.close()
             except:
                 logger.error("SOCKS DNS resolving failed", exc_info=True)
+            else:
                 if ip is not None:
                     logger.info ('Adding ' + ip + ' to knownNodes based on SOCKS DNS bootstrap method')
                     shared.knownNodes[1][shared.Peer(ip, port)] = time.time()

src/socks/__init__.py

@@ -64,7 +64,10 @@ _generalerrors = ("success",
     "not available",
     "bad proxy type",
     "bad input",
-    "timed out")
+    "timed out",
+    "network unreachable",
+    "connection refused",
+    "host unreachable")
 
 _socks5errors = ("succeeded",
     "general SOCKS server failure",
@@ -404,9 +407,11 @@ class socksocket(socket.socket):
                 _orgsocket.connect(self, (self.__proxy[1], portnum))
             except socket.error as e:
                 if e[0] == 101:
-                    raise Socks5Error((3, _socks5errors[3]))
+                    raise GeneralProxyError((7, _generalerrors[7]))
                 if e[0] == 111:
-                    raise Socks5Error((5, _socks5errors[5]))
+                    raise GeneralProxyError((8, _generalerrors[8]))
+                if e[0] == 113:
+                    raise GeneralProxyError((9, _generalerrors[9]))
                 raise
             self.__negotiatesocks5()
             self.__connectsocks5(destpair[0], destpair[1])