Replace decode errors when reading device configs.

gns3server/modules/dynamips/__init__.py

@@ -474,7 +474,7 @@ class Dynamips(IModule):
             raise DynamipsError("Could not create configs directory: {}".format(e))
 
         try:
-            with open(local_base_config, "r") as f:
+            with open(local_base_config, "r", errors="replace") as f:
                 config = f.read()
             with open(config_path, "w") as f:
                 config = "!\n" + config.replace("\r", "")

gns3server/modules/dynamips/hypervisor.py

@@ -251,7 +251,7 @@ class Hypervisor(DynamipsHypervisor):
         output = ""
         if self._stdout_file and os.access(self._stdout_file, os.R_OK):
             try:
-                with open(self._stdout_file) as file:
+                with open(self._stdout_file, errors="replace") as file:
                     output = file.read()
             except OSError as e:
                 log.warn("could not read {}: {}".format(self._stdout_file, e))

gns3server/modules/dynamips/nodes/router.py

@@ -223,7 +223,7 @@ class Router(object):
             startup_config_path = os.path.join(self.hypervisor.working_dir, "configs", "{}.cfg".format(self.name))
             if os.path.isfile(startup_config_path):
                 try:
-                    with open(startup_config_path, "r+") as f:
+                    with open(startup_config_path, "r+", errors="replace") as f:
                         old_config = f.read()
                         new_config = old_config.replace(self.name, new_name)
                         f.seek(0)
@@ -239,7 +239,7 @@ class Router(object):
             private_config_path = os.path.join(self.hypervisor.working_dir, "configs", "{}-private.cfg".format(self.name))
             if os.path.isfile(private_config_path):
                 try:
-                    with open(private_config_path, "r+") as f:
+                    with open(private_config_path, "r+", errors="replace") as f:
                         old_config = f.read()
                         new_config = old_config.replace(self.name, new_name)
                         f.seek(0)