mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-24 09:18:08 +00:00
Changed the way vpcs closes by using the socket to send quit message instead of pid kill
This commit is contained in:
Joe Bowen
parent
bbce6b2c5c
commit
588ee8eed0
@ -18,8 +18,10 @@
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import sys
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from .base import IModule
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from .dynamips import Dynamips
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from .vpcs import VPCS
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MODULES = [Dynamips]
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MODULES.append(VPCS)
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if sys.platform.startswith("linux"):
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# IOU runs only on Linux
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@ -65,17 +65,17 @@ class VPCS(IModule):
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# get the VPCS location
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config = Config.instance()
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VPCS_config = config.get_section_config(name.upper())
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self._VPCS = VPCS_config.get("VPCS")
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self._VPCS = VPCS_config.get("vpcs")
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if not self._VPCS or not os.path.isfile(self._VPCS):
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VPCS_in_cwd = os.path.join(os.getcwd(), "VPCS")
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VPCS_in_cwd = os.path.join(os.getcwd(), "vpcs")
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if os.path.isfile(VPCS_in_cwd):
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self._VPCS = VPCS_in_cwd
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else:
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# look for VPCS if none is defined or accessible
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for path in os.environ["PATH"].split(":"):
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try:
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if "VPCS" in os.listdir(path) and os.access(os.path.join(path, "VPCS"), os.X_OK):
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self._VPCS = os.path.join(path, "VPCS")
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if "vpcs" in os.listdir(path) and os.access(os.path.join(path, "vpcs"), os.X_OK):
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self._VPCS = os.path.join(path, "vpcs")
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break
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except OSError:
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continue
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@ -102,8 +102,8 @@ class VPCS(IModule):
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self._VPCSrc = ""
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# check every 5 seconds
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self._VPCS_callback = self.add_periodic_callback(self._check_VPCS_is_alive, 5000)
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self._VPCS_callback.start()
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#self._VPCS_callback = self.add_periodic_callback(self._check_VPCS_is_alive, 5000)
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#self._VPCS_callback.start()
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def stop(self, signum=None):
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"""
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@ -135,12 +135,12 @@ class VPCS(IModule):
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"id": VPCS_id,
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"name": VPCS_instance.name}
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if not VPCS_instance.is_running():
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stdout = VPCS_instance.read_VPCS_stdout()
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stdout = VPCS_instance.read_vpcs_stdout()
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notification["message"] = "VPCS has stopped running"
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notification["details"] = stdout
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self.send_notification("{}.VPCS_stopped".format(self.name), notification)
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elif not VPCS_instance.is_VPCS_running():
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stdout = VPCS_instance.read_VPCS_stdout()
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stdout = VPCS_instance.read_vpcs_stdout()
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notification["message"] = "VPCS has stopped running"
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notification["details"] = stdout
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self.send_notification("{}.VPCS_stopped".format(self.name), notification)
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@ -161,7 +161,7 @@ class VPCS(IModule):
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return None
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return self._VPCS_instances[VPCS_id]
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@IModule.route("VPCS.reset")
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@IModule.route("vpcs.reset")
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def reset(self, request):
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"""
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Resets the module.
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@ -184,7 +184,7 @@ class VPCS(IModule):
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log.info("VPCS module has been reset")
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@IModule.route("VPCS.settings")
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@IModule.route("vpcs.settings")
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def settings(self, request):
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"""
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Set or update settings.
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@ -247,7 +247,7 @@ class VPCS(IModule):
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return {"result": result, "message": message}
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@IModule.route("VPCS.test_settings")
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@IModule.route("vpcs.test_settings")
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def test_settings(self, request):
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"""
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"""
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@ -256,7 +256,7 @@ class VPCS(IModule):
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self.send_response(response)
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@IModule.route("VPCS.create")
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@IModule.route("vpcs.create")
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def VPCS_create(self, request):
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"""
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Creates a new VPCS instance.
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@ -313,7 +313,7 @@ class VPCS(IModule):
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self._VPCS_instances[VPCS_instance.id] = VPCS_instance
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self.send_response(response)
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@IModule.route("VPCS.delete")
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@IModule.route("vpcs.delete")
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def VPCS_delete(self, request):
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"""
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Deletes an VPCS instance.
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@ -345,7 +345,7 @@ class VPCS(IModule):
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self.send_response(True)
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@IModule.route("VPCS.update")
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@IModule.route("vpcs.update")
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def VPCS_update(self, request):
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"""
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Updates an VPCS instance
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@ -355,7 +355,7 @@ class VPCS(IModule):
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Optional request parameters:
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- any setting to update
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- startup_config_base64 (startup-config base64 encoded)
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- script_file_base64 (script-file base64 encoded)
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Response parameters:
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- updated settings
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@ -374,20 +374,20 @@ class VPCS(IModule):
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response = {}
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try:
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# a new startup-config has been pushed
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if "startup_config_base64" in request:
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config = base64.decodestring(request["startup_config_base64"].encode("utf-8")).decode("utf-8")
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# a new script-file has been pushed
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if "script_file_base64" in request:
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config = base64.decodestring(request["script_file_base64"].encode("utf-8")).decode("utf-8")
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config = "!\n" + config.replace("\r", "")
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config = config.replace('%h', VPCS_instance.name)
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config_path = os.path.join(VPCS_instance.working_dir, "startup-config")
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config_path = os.path.join(VPCS_instance.working_dir, "script-file")
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try:
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with open(config_path, "w") as f:
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log.info("saving startup-config to {}".format(config_path))
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log.info("saving script-file to {}".format(config_path))
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f.write(config)
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except OSError as e:
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raise VPCSError("Could not save the configuration {}: {}".format(config_path, e))
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# update the request with the new local startup-config path
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request["startup_config"] = os.path.basename(config_path)
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# update the request with the new local script-file path
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request["script_file"] = os.path.basename(config_path)
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except VPCSError as e:
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self.send_custom_error(str(e))
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@ -405,7 +405,7 @@ class VPCS(IModule):
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self.send_response(response)
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@IModule.route("VPCS.start")
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@IModule.route("vpcs.start")
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def vm_start(self, request):
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"""
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Starts an VPCS instance.
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@ -438,7 +438,7 @@ class VPCS(IModule):
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return
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self.send_response(True)
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@IModule.route("VPCS.stop")
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@IModule.route("vpcs.stop")
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def vm_stop(self, request):
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"""
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Stops an VPCS instance.
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@ -468,7 +468,7 @@ class VPCS(IModule):
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return
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self.send_response(True)
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@IModule.route("VPCS.reload")
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@IModule.route("vpcs.reload")
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def vm_reload(self, request):
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"""
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Reloads an VPCS instance.
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@ -500,7 +500,7 @@ class VPCS(IModule):
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return
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self.send_response(True)
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@IModule.route("VPCS.allocate_udp_port")
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@IModule.route("vpcs.allocate_udp_port")
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def allocate_udp_port(self, request):
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"""
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Allocates a UDP port in order to create an UDP NIO.
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@ -573,7 +573,7 @@ class VPCS(IModule):
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raise VPCSError("{} has no privileged access to {}.".format(self._VPCS, device))
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@IModule.route("VPCS.add_nio")
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@IModule.route("vpcs.add_nio")
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def add_nio(self, request):
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"""
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Adds an NIO (Network Input/Output) for an VPCS instance.
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@ -633,7 +633,7 @@ class VPCS(IModule):
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self.send_response({"port_id": request["port_id"]})
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@IModule.route("VPCS.delete_nio")
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@IModule.route("vpcs.delete_nio")
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def delete_nio(self, request):
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"""
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Deletes an NIO (Network Input/Output).
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@ -668,7 +668,7 @@ class VPCS(IModule):
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self.send_response(True)
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@IModule.route("VPCS.echo")
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@IModule.route("vpcs.echo")
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def echo(self, request):
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"""
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Echo end point for testing purposes.
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@ -27,7 +27,8 @@ import subprocess
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import argparse
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import threading
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import configparser
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from .vpcscon import start_vpcscon
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import sys
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import socket
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from .vpcs_error import VPCSError
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from .adapters.ethernet_adapter import EthernetAdapter
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from .nios.nio_udp import NIO_UDP
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@ -51,11 +52,11 @@ class VPCSDevice(object):
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def __init__(self, path, working_dir, host="127.0.0.1", name=None):
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# find an instance identifier (0 <= id < 255)
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# find an instance identifier (1 <= id <= 255)
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# This 255 limit is due to a restriction on the number of possible
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# mac addresses given in VPCS using the -m option
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self._id = 0
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for identifier in range(0, 255):
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for identifier in range(1, 256):
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if identifier not in self._instances:
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self._id = identifier
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self._instances.append(self._id)
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@ -74,9 +75,7 @@ class VPCSDevice(object):
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self._command = []
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self._process = None
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self._vpcs_stdout_file = ""
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self._vpcscon_thead = None
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self._vpcscon_thread_stop_event = None
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self._host = host
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self._host = "127.0.0.1"
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self._started = False
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# VPCS settings
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@ -252,19 +251,6 @@ class VPCSDevice(object):
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return self._started
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def _start_vpcscon(self):
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"""
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Starts vpcscon thread (for console connections).
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"""
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if not self._vpcscon_thead:
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telnet_server = "{}:{}".format(self._host, self._console)
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log.info("starting vpcscon for VPCS instance {} to accept Telnet connections on {}".format(self._name, telnet_server))
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args = argparse.Namespace(appl_id=str(self._id), debug=False, escape='^^', telnet_limit=0, telnet_server=telnet_server)
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self._vpcscon_thread_stop_event = threading.Event()
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self._vpcscon_thead = threading.Thread(target=start_vpcscon, args=(args, self._vpcscon_thread_stop_event))
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self._vpcscon_thead.start() ", ".join(missing_libs)))
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def start(self):
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"""
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Starts the VPCS process.
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@ -297,9 +283,6 @@ class VPCSDevice(object):
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log.error("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
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raise VPCSError("could not start VPCS {}: {}\n{}".format(self._path, e, vpcs_stdout))
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# start console support
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self._start_vpcscon()
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def stop(self):
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"""
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Stops the VPCS process.
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@ -309,23 +292,16 @@ class VPCSDevice(object):
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if self.is_running():
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log.info("stopping VPCS instance {} PID={}".format(self._id, self._process.pid))
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try:
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self._process.terminate()
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self._process.wait(1)
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except subprocess.TimeoutExpired:
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self._process.kill()
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if self._process.poll() == None:
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log.warn("VPCS instance {} PID={} is still running".format(self._id,
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self._process.pid))
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((self._host, self._console))
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sock.send(bytes("quit\n", 'UTF-8'))
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sock.close()
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except TypeError as e:
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log.warn("VPCS instance {} PID={} is still running. Error: {}".format(self._id,
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self._process.pid, e))
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self._process = None
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self._started = False
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# stop console support
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if self._vpcscon_thead:
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self._vpcscon_thread_stop_event.set()
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if self._vpcscon_thead.is_alive():
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self._vpcscon_thead.join(timeout=0.10)
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self._vpcscon_thead = None
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def read_vpcs_stdout(self):
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"""
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@ -349,8 +325,16 @@ class VPCSDevice(object):
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:returns: True or False
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"""
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if self._process and self._process.poll() == None:
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return True
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if self._process:
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try:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.connect((self._host, self._console))
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sock.close()
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return True
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except:
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e = sys.exc_info()[0]
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log.warn("Could not connect to {}:{}. Error: {}".format(self._host, self._console, e))
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return False
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return False
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@ -1,642 +0,0 @@
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013, 2014 James E. Carpenter
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import socket
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import sys
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import os
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import select
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import fcntl
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import struct
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import termios
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import tty
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import time
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import argparse
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import traceback
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import logging
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log = logging.getLogger(__name__)
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# Escape characters
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ESC_CHAR = '^^' # can be overriden from command line
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ESC_QUIT = 'q'
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# VPCS seems to only send *1* byte at a time. If
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# they ever fix that we'll be ready for it.
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BUFFER_SIZE = 1024
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# How long to wait before retrying a connection (seconds)
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RETRY_DELAY = 3
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# How often to test an idle connection (seconds)
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POLL_TIMEOUT = 3
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EXIT_SUCCESS = 0
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EXIT_FAILURE = 1
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EXIT_ABORT = 2
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# Mostly from:
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# https://code.google.com/p/miniboa/source/browse/trunk/miniboa/telnet.py
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#--[ Telnet Commands ]---------------------------------------------------------
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SE = 240 # End of subnegotiation parameters
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NOP = 241 # No operation
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DATMK = 242 # Data stream portion of a sync.
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BREAK = 243 # NVT Character BRK
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IP = 244 # Interrupt Process
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AO = 245 # Abort Output
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AYT = 246 # Are you there
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EC = 247 # Erase Character
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EL = 248 # Erase Line
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GA = 249 # The Go Ahead Signal
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SB = 250 # Sub-option to follow
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WILL = 251 # Will; request or confirm option begin
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WONT = 252 # Wont; deny option request
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DO = 253 # Do = Request or confirm remote option
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DONT = 254 # Don't = Demand or confirm option halt
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IAC = 255 # Interpret as Command
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SEND = 1 # Sub-process negotiation SEND command
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IS = 0 # Sub-process negotiation IS command
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#--[ Telnet Options ]----------------------------------------------------------
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BINARY = 0 # Transmit Binary
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ECHO = 1 # Echo characters back to sender
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RECON = 2 # Reconnection
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SGA = 3 # Suppress Go-Ahead
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TMARK = 6 # Timing Mark
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TTYPE = 24 # Terminal Type
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NAWS = 31 # Negotiate About Window Size
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LINEMO = 34 # Line Mode
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class FileLock:
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# struct flock { /* from fcntl(2) */
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# ...
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# short l_type; /* Type of lock: F_RDLCK,
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# F_WRLCK, F_UNLCK */
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# short l_whence; /* How to interpret l_start:
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# SEEK_SET, SEEK_CUR, SEEK_END */
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# off_t l_start; /* Starting offset for lock */
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# off_t l_len; /* Number of bytes to lock */
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# pid_t l_pid; /* PID of process blocking our lock
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# (F_GETLK only) */
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# ...
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# };
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_flock = struct.Struct('hhqql')
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def __init__(self, fname=None):
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self.fd = None
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self.fname = fname
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def get_lock(self):
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flk = self._flock.pack(fcntl.F_WRLCK, os.SEEK_SET,
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0, 0, os.getpid())
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flk = self._flock.unpack(
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fcntl.fcntl(self.fd, fcntl.F_GETLK, flk))
|
||||
|
||||
# If it's not locked (or is locked by us) then return None,
|
||||
# otherwise return the PID of the owner.
|
||||
if flk[0] == fcntl.F_UNLCK:
|
||||
return None
|
||||
return flk[4]
|
||||
|
||||
def lock(self):
|
||||
try:
|
||||
self.fd = open('{}.lck'.format(self.fname), 'a')
|
||||
except Exception as e:
|
||||
raise LockError("Couldn't get lock on {}: {}"
|
||||
.format(self.fname, e))
|
||||
|
||||
flk = self._flock.pack(fcntl.F_WRLCK, os.SEEK_SET, 0, 0, 0)
|
||||
try:
|
||||
fcntl.fcntl(self.fd, fcntl.F_SETLK, flk)
|
||||
except BlockingIOError:
|
||||
raise LockError("Already connected. PID {} has lock on {}"
|
||||
.format(self.get_lock(), self.fname))
|
||||
|
||||
# If we got here then we must have the lock. Store the PID.
|
||||
self.fd.truncate(0)
|
||||
self.fd.write('{}\n'.format(os.getpid()))
|
||||
self.fd.flush()
|
||||
|
||||
def unlock(self):
|
||||
if self.fd:
|
||||
# Deleting first prevents a race condition
|
||||
os.unlink(self.fd.name)
|
||||
self.fd.close()
|
||||
|
||||
def __enter__(self):
|
||||
self.lock()
|
||||
|
||||
def __exit__(self, exc_type, exc_val, exc_tb):
|
||||
self.unlock()
|
||||
return False
|
||||
|
||||
|
||||
class Console:
|
||||
def fileno(self):
|
||||
raise NotImplementedError("Only routers have fileno()")
|
||||
|
||||
|
||||
class Router:
|
||||
pass
|
||||
|
||||
|
||||
class TTY(Console):
|
||||
|
||||
def read(self, fileno, bufsize):
|
||||
return self.fd.read(bufsize)
|
||||
|
||||
def write(self, buf):
|
||||
return self.fd.write(buf)
|
||||
|
||||
def register(self, epoll):
|
||||
self.epoll = epoll
|
||||
epoll.register(self.fd, select.EPOLLIN | select.EPOLLET)
|
||||
|
||||
def __enter__(self):
|
||||
try:
|
||||
self.fd = open('/dev/tty', 'r+b', buffering=0)
|
||||
except OSError as e:
|
||||
raise TTYError("Couldn't open controlling TTY: {}".format(e))
|
||||
|
||||
# Save original flags
|
||||
self.termios = termios.tcgetattr(self.fd)
|
||||
self.fcntl = fcntl.fcntl(self.fd, fcntl.F_GETFL)
|
||||
|
||||
# Update flags
|
||||
tty.setraw(self.fd, termios.TCSANOW)
|
||||
fcntl.fcntl(self.fd, fcntl.F_SETFL, self.fcntl | os.O_NONBLOCK)
|
||||
|
||||
return self
|
||||
|
||||
def __exit__(self, exc_type, exc_val, exc_tb):
|
||||
|
||||
# Restore flags to original settings
|
||||
termios.tcsetattr(self.fd, termios.TCSANOW, self.termios)
|
||||
fcntl.fcntl(self.fd, fcntl.F_SETFL, self.fcntl)
|
||||
|
||||
self.fd.close()
|
||||
|
||||
return False
|
||||
|
||||
|
||||
class TelnetServer(Console):
|
||||
|
||||
def __init__(self, addr, port, stop_event):
|
||||
self.addr = addr
|
||||
self.port = port
|
||||
self.fd_dict = {}
|
||||
self.stop_event = stop_event
|
||||
|
||||
def read(self, fileno, bufsize):
|
||||
# Someone wants to connect?
|
||||
if fileno == self.sock_fd.fileno():
|
||||
self._accept()
|
||||
return None
|
||||
|
||||
self._cur_fileno = fileno
|
||||
|
||||
# Read a maximum of _bufsize_ bytes without blocking. When it
|
||||
# would want to block it means there's no more data. An empty
|
||||
# buffer normally means that we've been disconnected.
|
||||
try:
|
||||
buf = self._read_cur(bufsize, socket.MSG_DONTWAIT)
|
||||
except BlockingIOError:
|
||||
return None
|
||||
if not buf:
|
||||
self._disconnect(fileno)
|
||||
|
||||
# Process and remove any telnet commands from the buffer
|
||||
if IAC in buf:
|
||||
buf = self._IAC_parser(buf)
|
||||
|
||||
return buf
|
||||
|
||||
def write(self, buf):
|
||||
for fd in self.fd_dict.values():
|
||||
fd.send(buf)
|
||||
|
||||
def register(self, epoll):
|
||||
self.epoll = epoll
|
||||
epoll.register(self.sock_fd, select.EPOLLIN)
|
||||
|
||||
def _read_block(self, bufsize):
|
||||
buf = self._read_cur(bufsize, socket.MSG_WAITALL)
|
||||
# If we don't get everything we were looking for then the
|
||||
# client probably disconnected.
|
||||
if len(buf) < bufsize:
|
||||
self._disconnect(self._cur_fileno)
|
||||
return buf
|
||||
|
||||
def _read_cur(self, bufsize, flags):
|
||||
return self.fd_dict[self._cur_fileno].recv(bufsize, flags)
|
||||
|
||||
def _write_cur(self, buf):
|
||||
return self.fd_dict[self._cur_fileno].send(buf)
|
||||
|
||||
def _IAC_parser(self, buf):
|
||||
skip_to = 0
|
||||
while not self.stop_event.is_set():
|
||||
# Locate an IAC to process
|
||||
iac_loc = buf.find(IAC, skip_to)
|
||||
if iac_loc < 0:
|
||||
break
|
||||
|
||||
# Get the TELNET command
|
||||
iac_cmd = bytearray([IAC])
|
||||
try:
|
||||
iac_cmd.append(buf[iac_loc + 1])
|
||||
except IndexError:
|
||||
buf.extend(self._read_block(1))
|
||||
iac_cmd.append(buf[iac_loc + 1])
|
||||
|
||||
# Is this just a 2-byte TELNET command?
|
||||
if iac_cmd[1] not in [WILL, WONT, DO, DONT]:
|
||||
if iac_cmd[1] == AYT:
|
||||
log.debug("Telnet server received Are-You-There (AYT)")
|
||||
self._write_cur(
|
||||
b'\r\nYour Are-You-There received. I am here.\r\n'
|
||||
)
|
||||
elif iac_cmd[1] == IAC:
|
||||
# It's data, not an IAC
|
||||
iac_cmd.pop()
|
||||
# This prevents the 0xff from being
|
||||
# interputed as yet another IAC
|
||||
skip_to = iac_loc + 1
|
||||
log.debug("Received IAC IAC")
|
||||
elif iac_cmd[1] == NOP:
|
||||
pass
|
||||
else:
|
||||
log.debug("Unhandled telnet command: "
|
||||
"{0:#x} {1:#x}".format(*iac_cmd))
|
||||
|
||||
# This must be a 3-byte TELNET command
|
||||
else:
|
||||
try:
|
||||
iac_cmd.append(buf[iac_loc + 2])
|
||||
except IndexError:
|
||||
buf.extend(self._read_block(1))
|
||||
iac_cmd.append(buf[iac_loc + 2])
|
||||
# We do ECHO, SGA, and BINARY. Period.
|
||||
if (iac_cmd[1] == DO
|
||||
and iac_cmd[2] not in [ECHO, SGA, BINARY]):
|
||||
|
||||
self._write_cur(bytes([IAC, WONT, iac_cmd[2]]))
|
||||
log.debug("Telnet WON'T {:#x}".format(iac_cmd[2]))
|
||||
else:
|
||||
log.debug("Unhandled telnet command: "
|
||||
"{0:#x} {1:#x} {2:#x}".format(*iac_cmd))
|
||||
|
||||
# Remove the entire TELNET command from the buffer
|
||||
buf = buf.replace(iac_cmd, b'', 1)
|
||||
|
||||
# Return the new copy of the buffer, minus telnet commands
|
||||
return buf
|
||||
|
||||
def _accept(self):
|
||||
fd, addr = self.sock_fd.accept()
|
||||
self.fd_dict[fd.fileno()] = fd
|
||||
self.epoll.register(fd, select.EPOLLIN | select.EPOLLET)
|
||||
|
||||
log.info("Telnet connection from {}:{}".format(addr[0], addr[1]))
|
||||
|
||||
# This is a one-way negotiation. This is very basic so there
|
||||
# shouldn't be any problems with any decent client.
|
||||
fd.send(bytes([IAC, WILL, ECHO,
|
||||
IAC, WILL, SGA,
|
||||
IAC, WILL, BINARY,
|
||||
IAC, DO, BINARY]))
|
||||
|
||||
if args.telnet_limit and len(self.fd_dict) > args.telnet_limit:
|
||||
fd.send(b'\r\nToo many connections\r\n')
|
||||
self._disconnect(fd.fileno())
|
||||
log.warn("Client disconnected because of too many connections. "
|
||||
"(limit currently {})".format(args.telnet_limit))
|
||||
|
||||
def _disconnect(self, fileno):
|
||||
fd = self.fd_dict.pop(fileno)
|
||||
log.info("Telnet client disconnected")
|
||||
fd.shutdown(socket.SHUT_RDWR)
|
||||
fd.close()
|
||||
|
||||
def __enter__(self):
|
||||
# Open a socket and start listening
|
||||
sock_fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
|
||||
sock_fd.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
|
||||
try:
|
||||
sock_fd.bind((self.addr, self.port))
|
||||
except OSError:
|
||||
raise TelnetServerError("Cannot bind to {}:{}"
|
||||
.format(self.addr, self.port))
|
||||
|
||||
sock_fd.listen(socket.SOMAXCONN)
|
||||
self.sock_fd = sock_fd
|
||||
log.info("Telnet server ready for connections on {}:{}".format(self.addr, self.port))
|
||||
|
||||
return self
|
||||
|
||||
def __exit__(self, exc_type, exc_val, exc_tb):
|
||||
for fileno in list(self.fd_dict.keys()):
|
||||
self._disconnect(fileno)
|
||||
self.sock_fd.close()
|
||||
return False
|
||||
|
||||
|
||||
class VPCS(Router):
|
||||
|
||||
def __init__(self, ttyC, ttyS, stop_event):
|
||||
self.ttyC = ttyC
|
||||
self.ttyS = ttyS
|
||||
self.stop_event = stop_event
|
||||
|
||||
def read(self, bufsize):
|
||||
try:
|
||||
buf = self.fd.recv(bufsize)
|
||||
except BlockingIOError:
|
||||
return None
|
||||
return buf
|
||||
|
||||
def write(self, buf):
|
||||
self.fd.send(buf)
|
||||
|
||||
def _open(self):
|
||||
self.fd = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
|
||||
self.fd.setblocking(False)
|
||||
|
||||
def _bind(self):
|
||||
try:
|
||||
os.unlink(self.ttyC)
|
||||
except FileNotFoundError:
|
||||
pass
|
||||
except Exception as e:
|
||||
raise NetioError("Couldn't unlink socket {}: {}"
|
||||
.format(self.ttyC, e))
|
||||
|
||||
try:
|
||||
self.fd.bind(self.ttyC)
|
||||
except Exception as e:
|
||||
raise NetioError("Couldn't create socket {}: {}"
|
||||
.format(self.ttyC, e))
|
||||
|
||||
def _connect(self):
|
||||
# Keep trying until we connect or die trying
|
||||
while not self.stop_event.is_set():
|
||||
try:
|
||||
self.fd.connect(self.ttyS)
|
||||
except FileNotFoundError:
|
||||
log.debug("Waiting to connect to {}".format(self.ttyS))
|
||||
time.sleep(RETRY_DELAY)
|
||||
except Exception as e:
|
||||
raise NetioError("Couldn't connect to socket {}: {}"
|
||||
.format(self.ttyS, e))
|
||||
else:
|
||||
break
|
||||
|
||||
def register(self, epoll):
|
||||
self.epoll = epoll
|
||||
epoll.register(self.fd, select.EPOLLIN | select.EPOLLET)
|
||||
|
||||
def fileno(self):
|
||||
return self.fd.fileno()
|
||||
|
||||
def __enter__(self):
|
||||
self._open()
|
||||
self._bind()
|
||||
self._connect()
|
||||
return self
|
||||
|
||||
def __exit__(self, exc_type, exc_val, exc_tb):
|
||||
os.unlink(self.ttyC)
|
||||
self.fd.close()
|
||||
return False
|
||||
|
||||
|
||||
class VPCSConError(Exception):
|
||||
pass
|
||||
|
||||
|
||||
class LockError(VPCSConError):
|
||||
pass
|
||||
|
||||
|
||||
class NetioError(VPCSConError):
|
||||
pass
|
||||
|
||||
|
||||
class TTYError(VPCSConError):
|
||||
pass
|
||||
|
||||
|
||||
class TelnetServerError(VPCSConError):
|
||||
pass
|
||||
|
||||
|
||||
class ConfigError(VPCSConError):
|
||||
pass
|
||||
|
||||
|
||||
def mkdir_netio(netio_dir):
|
||||
try:
|
||||
os.mkdir(netio_dir)
|
||||
except FileExistsError:
|
||||
pass
|
||||
except Exception as e:
|
||||
raise NetioError("Couldn't create directory {}: {}"
|
||||
.format(netio_dir, e))
|
||||
|
||||
|
||||
def send_recv_loop(console, router, esc_char, stop_event):
|
||||
|
||||
epoll = select.epoll()
|
||||
router.register(epoll)
|
||||
console.register(epoll)
|
||||
|
||||
router_fileno = router.fileno()
|
||||
esc_quit = bytes(ESC_QUIT.upper(), 'ascii')
|
||||
esc_state = False
|
||||
|
||||
while not stop_event.is_set():
|
||||
event_list = epoll.poll(timeout=POLL_TIMEOUT)
|
||||
|
||||
# When/if the poll times out we send an empty datagram. If VPCS
|
||||
# has gone away then this will toss a ConnectionRefusedError
|
||||
# exception.
|
||||
if not event_list:
|
||||
router.write(b'')
|
||||
continue
|
||||
|
||||
for fileno, event in event_list:
|
||||
buf = bytearray()
|
||||
|
||||
# VPCS --> tty(s)
|
||||
if fileno == router_fileno:
|
||||
while not stop_event.is_set():
|
||||
data = router.read(BUFFER_SIZE)
|
||||
if not data:
|
||||
break
|
||||
buf.extend(data)
|
||||
console.write(buf)
|
||||
|
||||
# tty --> VPCS
|
||||
else:
|
||||
while not stop_event.is_set():
|
||||
data = console.read(fileno, BUFFER_SIZE)
|
||||
if not data:
|
||||
break
|
||||
buf.extend(data)
|
||||
|
||||
# If we just received the escape character then
|
||||
# enter the escape state.
|
||||
#
|
||||
# If we are in the escape state then check for a
|
||||
# quit command. Or if it's the escape character then
|
||||
# send the escape character. Else, send the escape
|
||||
# character we ate earlier and whatever character we
|
||||
# just got. Exit escape state.
|
||||
#
|
||||
# If we're not in the escape state and this isn't an
|
||||
# escape character then just send it to VPCS.
|
||||
if esc_state:
|
||||
if buf.upper() == esc_quit:
|
||||
sys.exit(EXIT_SUCCESS)
|
||||
elif buf == esc_char:
|
||||
router.write(esc_char)
|
||||
else:
|
||||
router.write(esc_char)
|
||||
router.write(buf)
|
||||
esc_state = False
|
||||
elif buf == esc_char:
|
||||
esc_state = True
|
||||
else:
|
||||
router.write(buf)
|
||||
|
||||
|
||||
def get_args():
|
||||
parser = argparse.ArgumentParser(
|
||||
description='Connect to an VPCS console port.')
|
||||
parser.add_argument('-d', '--debug', action='store_true',
|
||||
help='display some debugging information')
|
||||
parser.add_argument('-e', '--escape',
|
||||
help='set escape character (default: %(default)s)',
|
||||
default=ESC_CHAR, metavar='CHAR')
|
||||
parser.add_argument('-t', '--telnet-server',
|
||||
help='start telnet server listening on ADDR:PORT',
|
||||
metavar='ADDR:PORT', default=False)
|
||||
parser.add_argument('-l', '--telnet-limit',
|
||||
help='maximum number of simultaneous '
|
||||
'telnet connections (default: %(default)s)',
|
||||
metavar='LIMIT', type=int, default=1)
|
||||
parser.add_argument('appl_id', help='VPCS instance identifier')
|
||||
return parser.parse_args()
|
||||
|
||||
|
||||
def get_escape_character(escape):
|
||||
|
||||
# Figure out the escape character to use.
|
||||
# Can be any ASCII character or a spelled out control
|
||||
# character, like "^e". The string "none" disables it.
|
||||
if escape.lower() == 'none':
|
||||
esc_char = b''
|
||||
elif len(escape) == 2 and escape[0] == '^':
|
||||
c = ord(escape[1].upper()) - 0x40
|
||||
if not 0 <= c <= 0x1f: # control code range
|
||||
raise ConfigError("Invalid control code")
|
||||
esc_char = bytes([c])
|
||||
elif len(escape) == 1:
|
||||
try:
|
||||
esc_char = bytes(escape, 'ascii')
|
||||
except ValueError as e:
|
||||
raise ConfigError("Invalid escape character") from e
|
||||
else:
|
||||
raise ConfigError("Invalid length for escape character")
|
||||
|
||||
return esc_char
|
||||
|
||||
|
||||
def start_VPCScon(cmdline_args, stop_event):
|
||||
|
||||
global args
|
||||
args = cmdline_args
|
||||
|
||||
if args.debug:
|
||||
logging.basicConfig(level=logging.DEBUG)
|
||||
else:
|
||||
# default logging level
|
||||
logging.basicConfig(level=logging.INFO)
|
||||
|
||||
# Create paths for the Unix domain sockets
|
||||
netio = '/tmp/netio{}'.format(os.getuid())
|
||||
ttyC = '{}/ttyC{}'.format(netio, args.appl_id)
|
||||
ttyS = '{}/ttyS{}'.format(netio, args.appl_id)
|
||||
|
||||
try:
|
||||
mkdir_netio(netio)
|
||||
with FileLock(ttyC):
|
||||
esc_char = get_escape_character(args.escape)
|
||||
|
||||
if args.telnet_server:
|
||||
addr, _, port = args.telnet_server.partition(':')
|
||||
nport = 0
|
||||
try:
|
||||
nport = int(port)
|
||||
except ValueError:
|
||||
pass
|
||||
if (addr == '' or nport == 0):
|
||||
raise ConfigError('format for --telnet-server must be '
|
||||
'ADDR:PORT (like 127.0.0.1:20000)')
|
||||
|
||||
while not stop_event.is_set():
|
||||
try:
|
||||
if args.telnet_server:
|
||||
with TelnetServer(addr, nport, stop_event) as console:
|
||||
with VPCS(ttyC, ttyS, stop_event) as router:
|
||||
send_recv_loop(console, router, b'', stop_event)
|
||||
else:
|
||||
with VPCS(ttyC, ttyS, stop_event) as router, TTY() as console:
|
||||
send_recv_loop(console, router, esc_char, stop_event)
|
||||
except ConnectionRefusedError:
|
||||
pass
|
||||
except KeyboardInterrupt:
|
||||
sys.exit(EXIT_ABORT)
|
||||
finally:
|
||||
# Put us at the beginning of a line
|
||||
if not args.telnet_server:
|
||||
print()
|
||||
|
||||
except VPCSConError as e:
|
||||
if args.debug:
|
||||
traceback.print_exc(file=sys.stderr)
|
||||
else:
|
||||
print(e, file=sys.stderr)
|
||||
sys.exit(EXIT_FAILURE)
|
||||
|
||||
log.info("exiting...")
|
||||
|
||||
|
||||
def main():
|
||||
|
||||
import threading
|
||||
stop_event = threading.Event()
|
||||
args = get_args()
|
||||
start_VPCScon(args, stop_event)
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Loading…
Reference in New Issue
Block a user