2 # NEPI, a framework to manage network experiments
3 # Copyright (C) 2013 INRIA
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
20 from nepi.execution.attribute import Attribute, Flags, Types
21 from nepi.execution.resource import clsinit_copy, ResourceState, \
23 from nepi.resources.linux.application import LinuxApplication
24 from nepi.util.sshfuncs import ProcStatus
25 from nepi.util.timefuncs import tnow, tdiffsec
32 class UdpTunnel(LinuxApplication):
34 _help = "Constructs a tunnel between two Linux endpoints using a UDP connection "
38 def _register_attributes(cls):
39 cipher = Attribute("cipher",
40 "Cipher to encript communication. "
41 "One of PLAIN, AES, Blowfish, DES, DES3. ",
43 allowed = ["PLAIN", "AES", "Blowfish", "DES", "DES3"],
44 type = Types.Enumerate,
47 cipher_key = Attribute("cipherKey",
48 "Specify a symmetric encryption key with which to protect "
49 "packets across the tunnel. python-crypto must be installed "
53 txqueuelen = Attribute("txQueueLen",
54 "Specifies the interface's transmission queue length. "
59 bwlimit = Attribute("bwLimit",
60 "Specifies the interface's emulated bandwidth in bytes "
65 cls._register_attribute(cipher)
66 cls._register_attribute(cipher_key)
67 cls._register_attribute(txqueuelen)
68 cls._register_attribute(bwlimit)
70 def __init__(self, ec, guid):
71 super(UdpTunnel, self).__init__(ec, guid)
72 self._home = "udp-tunnel-%s" % self.guid
78 def log_message(self, msg):
79 return " guid %d - tunnel %s - %s - %s " % (self.guid,
80 self.endpoint1.node.get("hostname"),
81 self.endpoint2.node.get("hostname"),
84 def get_endpoints(self):
85 """ Returns the list of RM that are endpoints to the tunnel
88 for guid in self.connections:
89 rm = self.ec.get_resource(guid)
90 if hasattr(rm, "udp_connect_command"):
96 endpoints = self.get_endpoints()
97 if endpoints: return endpoints[0]
102 endpoints = self.get_endpoints()
103 if endpoints and len(endpoints) > 1: return endpoints[1]
106 def app_home(self, endpoint):
107 return os.path.join(endpoint.node.exp_home, self._home)
109 def run_home(self, endpoint):
110 return os.path.join(self.app_home(endpoint), self.ec.run_id)
112 def udp_connect(self, endpoint, remote_ip):
113 # Get udp connect command
114 local_port_file = os.path.join(self.run_home(endpoint),
116 remote_port_file = os.path.join(self.run_home(endpoint),
118 ret_file = os.path.join(self.run_home(endpoint),
120 cipher = self.get("cipher")
121 cipher_key = self.get("cipherKey")
122 bwlimit = self.get("bwLimit")
123 txqueuelen = self.get("txQueueLen")
124 udp_connect_command = endpoint.udp_connect_command(
125 remote_ip, local_port_file, remote_port_file,
126 ret_file, cipher, cipher_key, bwlimit, txqueuelen)
128 # upload command to connect.sh script
129 shfile = os.path.join(self.app_home(endpoint), "udp-connect.sh")
130 endpoint.node.upload(udp_connect_command,
135 # invoke connect script
136 cmd = "bash %s" % shfile
137 (out, err), proc = endpoint.node.run(cmd, self.run_home(endpoint))
139 # check if execution errors occurred
140 msg = " Failed to connect endpoints "
143 self.error(msg, out, err)
144 raise RuntimeError, msg
146 # Wait for pid file to be generated
147 pid, ppid = endpoint.node.wait_pid(self.run_home(endpoint))
149 # If the process is not running, check for error information
150 # on the remote machine
151 if not pid or not ppid:
152 (out, err), proc = endpoint.node.check_errors(self.run_home(endpoint))
153 # Out is what was written in the stderr file
155 msg = " Failed to start command '%s' " % command
156 self.error(msg, out, err)
157 raise RuntimeError, msg
159 # wait until port is written to file
160 port = self.wait_local_port(endpoint)
161 return (port, pid, ppid)
163 def do_provision(self):
164 # create run dir for tunnel on each node
165 self.endpoint1.node.mkdir(self.run_home(self.endpoint1))
166 self.endpoint2.node.mkdir(self.run_home(self.endpoint2))
168 # Invoke connect script in endpoint 1
169 remote_ip1 = socket.gethostbyname(self.endpoint2.node.get("hostname"))
170 (port1, self._pid1, self._ppid1) = self.udp_connect(self.endpoint1,
173 # Invoke connect script in endpoint 2
174 remote_ip2 = socket.gethostbyname(self.endpoint1.node.get("hostname"))
175 (port2, self._pid2, self._ppid2) = self.udp_connect(self.endpoint2,
178 # upload file with port 2 to endpoint 1
179 self.upload_remote_port(self.endpoint1, port2)
181 # upload file with port 1 to endpoint 2
182 self.upload_remote_port(self.endpoint2, port1)
184 # check if connection was successful on both sides
185 self.wait_result(self.endpoint1)
186 self.wait_result(self.endpoint2)
188 self.info("Provisioning finished")
190 self.set_provisioned()
193 if (not self.endpoint1 or self.endpoint1.state < ResourceState.READY) or \
194 (not self.endpoint2 or self.endpoint2.state < ResourceState.READY):
195 self.ec.schedule(reschedule_delay, self.deploy)
203 if self.state == ResourceState.READY:
204 command = self.get("command")
205 self.info("Starting command '%s'" % command)
209 msg = " Failed to execute command '%s'" % command
210 self.error(msg, out, err)
211 raise RuntimeError, msg
214 """ Stops application execution
216 if self.state == ResourceState.STARTED:
217 self.info("Stopping tunnel")
219 # Only try to kill the process if the pid and ppid
221 if self._pid1 and self._ppid1 and self._pid2 and self._ppid2:
222 (out1, err1), proc1 = self.endpoint1.node.kill(self._pid1,
223 self._ppid1, sudo = True)
224 (out2, err2), proc2 = self.endpoint2.node.kill(self._pid2,
225 self._ppid2, sudo = True)
227 if (proc1.poll() and err1) or (proc2.poll() and err2):
228 # check if execution errors occurred
229 msg = " Failed to STOP tunnel"
230 self.error(msg, err1, err2)
231 raise RuntimeError, msg
237 """ Returns the state of the application
239 if self._state == ResourceState.STARTED:
240 # In order to avoid overwhelming the remote host and
241 # the local processor with too many ssh queries, the state is only
242 # requested every 'state_check_delay' seconds.
243 state_check_delay = 0.5
244 if tdiffsec(tnow(), self._last_state_check) > state_check_delay:
245 if self._pid1 and self._ppid1 and self._pid2 and self._ppid2:
246 # Make sure the process is still running in background
247 # No execution errors occurred. Make sure the background
248 # process with the recorded pid is still running.
249 status1 = self.endpoint1.node.status(self._pid1, self._ppid1)
250 status2 = self.endpoint2.node.status(self._pid2, self._ppid2)
252 if status1 == ProcStatus.FINISHED and \
253 status2 == ProcStatus.FINISHED:
255 # check if execution errors occurred
256 (out1, err1), proc1 = self.endpoint1.node.check_errors(
257 self.run_home(self.endpoint1))
259 (out2, err2), proc2 = self.endpoint2.node.check_errors(
260 self.run_home(self.endpoint2))
263 msg = "Error occurred in tunnel"
264 self.error(msg, err1, err2)
269 self._last_state_check = tnow()
273 def wait_local_port(self, endpoint):
274 """ Waits until the local_port file for the endpoint is generated,
275 and returns the port number
278 return self.wait_file(endpoint, "local_port")
280 def wait_result(self, endpoint):
281 """ Waits until the return code file for the endpoint is generated
284 return self.wait_file(endpoint, "ret_file")
286 def wait_file(self, endpoint, filename):
287 """ Waits until file on endpoint is generated """
292 (out, err), proc = endpoint.node.check_output(
293 self.run_home(endpoint), filename)
302 msg = "Couldn't retrieve %s" % filename
303 self.error(msg, out, err)
304 raise RuntimeError, msg
308 def upload_remote_port(self, endpoint, port):
309 # upload remote port number to file
311 endpoint.node.upload(port,
312 os.path.join(self.run_home(endpoint), "remote_port"),
316 def valid_connection(self, guid):