A basic implementation of port manager

gns3server/modules/base_manager.py

@@ -73,7 +73,7 @@ class BaseManager:
         else:
             if identifier in self._vms:
                 raise DeviceError("VM identifier {} is already used by another VM instance".format(identifier))
-        vm = self._VM_CLASS(vmname, identifier)
+        vm = self._VM_CLASS(vmname, identifier, self.port_manager)
         yield from vm.wait_for_creation()
         self._vms[vm.id] = vm
         return vm

gns3server/modules/base_vm.py

@@ -26,7 +26,7 @@ log = logging.getLogger(__name__)
 class BaseVM:
     _allocated_console_ports = []
 
-    def __init__(self, name, identifier):
+    def __init__(self, name, identifier, port_manager):
         self._loop = asyncio.get_event_loop()
         self._allocate_console()
         self._queue = asyncio.Queue()
@@ -34,6 +34,7 @@ class BaseVM:
         self._id = identifier
         self._created = asyncio.Future()
         self._worker = asyncio.async(self._run())
+        self._port_manager = port_manager
         log.info("{type} device {name} [id={id}] has been created".format(
             type=self.__class__.__name__,
             name=self._name,

gns3server/modules/port_manager.py

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2015 GNS3 Technologies Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import ipaddress
+from .attic import find_unused_port
+
+class PortManager:
+    """
+    :param console: TCP console port
+    :param console_host: IP address to bind for console connections
+    :param console_start_port_range: TCP console port range start
+    :param console_end_port_range: TCP console port range end
+    """
+    def __init__(self,
+            console_host,
+            console_bind_to_any,
+            console_start_port_range=10000,
+            console_end_port_range=15000):
+
+        self._console_start_port_range = console_start_port_range
+        self._console_end_port_range = console_end_port_range
+        self._used_ports = set()
+
+        if console_bind_to_any:
+            if ipaddress.ip_address(console_host).version == 6:
+                self._console_host = "::"
+            else:
+                self._console_host = "0.0.0.0"
+        else:
+            self._console_host = console_host
+
+    def get_free_port(self):
+        """Get an available console port and reserve it"""
+        port = find_unused_port(self._console_start_port_range,
+                                self._console_end_port_range,
+                                host=self._console_host,
+                                socket_type='TCP',
+                                ignore_ports=self._used_ports)
+        self._used_ports.add(port)
+        return port
+
+    def reserve_port(port):
+        """
+        Reserve a specific port number
+
+        :param port: Port number
+        """
+        if port in self._used_ports:
+            raise Exception("Port already {} in use".format(port))
+        self._used_ports.add(port)
+
+    def release_port(port):
+        """
+        Release a specific port number
+
+        :param port: Port number
+        """
+        self._used_ports.remove(port)
+

gns3server/modules/vpcs/vpcs_device.py

@@ -48,17 +48,11 @@ class VPCSDevice(BaseVM):
     :param path: path to VPCS executable
     :param working_dir: path to a working directory
     :param console: TCP console port
-    :param console_host: IP address to bind for console connections
-    :param console_start_port_range: TCP console port range start
-    :param console_end_port_range: TCP console port range end
     """
-    def __init__(self, name, vpcs_id,
+    def __init__(self, name, vpcs_id, port_manager,
              path = None,
              working_dir = None,
-             console=None,
-             console_host="0.0.0.0",
-             console_start_port_range=4512,
-             console_end_port_range=5000):
+             console=None):
 
         #self._path = path
         #self._working_dir = working_dir
@@ -67,13 +61,10 @@ class VPCSDevice(BaseVM):
         self._working_dir = "/tmp"
 
         self._console = console
-        self._console_host = console_host
         self._command = []
         self._process = None
         self._vpcs_stdout_file = ""
         self._started = False
-        self._console_start_port_range = console_start_port_range
-        self._console_end_port_range = console_end_port_range
 
         # VPCS settings
         self._script_file = ""
@@ -87,8 +78,16 @@ class VPCSDevice(BaseVM):
         # # create the device own working directory
         # self.working_dir = working_dir_path
         #
+        try:
+            if not self._console:
+                self._console = port_manager.get_free_port()
+            else:
+                self._console = port_manager.reserve_port(self._console)
+        except Exception as e:
+            raise VPCSError(e)
+
         self._check_requirements()
-        super().__init__(name, vpcs_id)
+        super().__init__(name, vpcs_id, port_manager)
 
     def _check_requirements(self):
         """
@@ -180,7 +179,6 @@ class VPCSDevice(BaseVM):
                 flags = 0
                 if sys.platform.startswith("win32"):
                     flags = subprocess.CREATE_NEW_PROCESS_GROUP
-                yield from asyncio.create_subprocess_exec()
                 with open(self._vpcs_stdout_file, "w") as fd:
                     self._process = yield from asyncio.create_subprocess_exec(*self._command,
                                                      stdout=fd,