Reworked HID path handling (to fix Windows issues)

cmd.py

@@ -47,11 +47,16 @@ def get_transport(transport_string, path, **kwargs):
 
         if path == '':
             try:
-                path = list_usb()[0]
+                path = list_usb()[0][0]
             except IndexError:
                 raise Exception("No Trezor found on USB")
 
-        return HidTransport(path, **kwargs)
+        for d in HidTransport.enumerate():
+            # Two-tuple of (normal_interface, debug_interface)
+            if path in d:
+                return HidTransport(d, **kwargs)
+
+        raise Exception("Device not found")
  
     if transport_string == 'serial':
         from trezorlib.transport_serial import SerialTransport
@@ -238,8 +243,7 @@ class Commands(object):
 
 def list_usb():
     from trezorlib.transport_hid import HidTransport
-    devices = HidTransport.enumerate()
-    return devices
+    return HidTransport.enumerate()
 
 class PinMatrixThread(threading.Thread):
     '''
@@ -307,19 +311,23 @@ def main():
             print json.dumps(devices)
         else:
             for dev in devices:
-                print dev
+                if dev[1] != None:
+                    print "%s - debuglink enabled" % dev[0]
+                else:
+                    print dev[0]
         return
 
-    transport = get_transport(args.transport, args.path)
     if args.debug:
         if args.debuglink_transport == 'usb' and args.debuglink_path == '':
             debuglink_transport = get_transport('usb', args.path, debug_link=True)
         else:
-            debuglink_transport = get_transport(args.debuglink_transport, args.debuglink_path)
+            debuglink_transport = get_transport(args.debuglink_transport,
+                                        args.debuglink_path, debug_link=True)
         debuglink = DebugLink(debuglink_transport)    
     else:
         debuglink = None
 
+    transport = get_transport(args.transport, args.path)
     client = TrezorClient(transport, pin_func=qt_pin_func, debuglink=debuglink)
     client.setup_debuglink(button=True, pin_correct=True)
     cmds = Commands(client)

trezorlib/transport_hid.py

@@ -2,6 +2,7 @@
 
 import hid
 import time
+import platform
 from transport import Transport, NotImplementedException
 
 DEVICE_IDS = [
@@ -21,26 +22,49 @@ class HidTransport(Transport):
     def __init__(self, device, *args, **kwargs):
         self.hid = None
         self.buffer = ''
-        if bool(kwargs.get('debug_link')):
-            device = device[:-2] + '01'
+        device = device[int(bool(kwargs.get('debug_link')))]
         super(HidTransport, self).__init__(device, *args, **kwargs)
 
+    @classmethod
+    def _detect_debuglink(cls, path):
+        # Takes platform-specific path of USB and
+        # decide if the HID interface is normal transport
+        # or debuglink
+        
+        if platform.system() in ('Linux', 'Darwin'):
+            # Sample: 0003:0017:00
+            if path.endswith(':00'):
+                return False
+            return True
+        
+        elif platform.system() == 'Windows':
+            # Sample: \\\\?\\hid#vid_534c&pid_0001&mi_01#7&1d71791f&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}
+            # Note: 'mi' parameter is optional and might be unset
+            if '&mi_01#' in path:  # ,,,<o.O>,,,~
+                return True
+            return False
+
+        else:
+            raise Exception("USB interface detection not implemented for %s" % platform.system())
+
     @classmethod
     def enumerate(cls):
-        devices = []
+        devices = {}
         for d in hid.enumerate(0, 0):
-            vendor_id = d.get('vendor_id')
-            product_id = d.get('product_id')
-            path = d.get('path')
+            vendor_id = d['vendor_id']
+            product_id = d['product_id']
+            serial_number = d['serial_number']
+            path = d['path']
 
-            if (vendor_id, product_id) in DEVICE_IDS and path.endswith(':00'):
-                devices.append(path)
+            if (vendor_id, product_id) in DEVICE_IDS:
+                devices.setdefault(serial_number, [None, None])
+                devices[serial_number][int(bool(cls._detect_debuglink(path)))] = path
                 
-        return devices
+        # List of two-tuples (path_normal, path_debuglink)
+        return devices.values()
         
     def _open(self):
         self.buffer = ''
-        print self.device
         self.hid = hid.device()
         self.hid.open_path(self.device)
         self.hid.set_nonblocking(True)