--- /dev/null
+#
+# NEPI, a framework to manage network experiments
+# Copyright (C) 2013 INRIA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation;
+#
+# 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/>.
+#
+# Author: Alina Quereilhac <alina.quereilhac@inria.fr>
+
+from __future__ import print_function
+
+import base64
+import errno
+import passfd
+import socket
+import vsys
+from optparse import OptionParser
+
+STOP_MSG = "STOP"
+PASSFD_MSG = "PASSFD"
+
+def create_socket(socket_name):
+ sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ sock.bind(socket_name)
+ return sock
+
+def recv_msg(conn):
+ msg = []
+ chunk = ''
+
+ while '\n' not in chunk:
+ try:
+ chunk = conn.recv(1024)
+ except (OSError, socket.error) as e:
+ if e[0] != errno.EINTR:
+ raise
+ # Ignore eintr errors
+ continue
+
+ if chunk:
+ msg.append(chunk)
+ else:
+ # empty chunk = EOF
+ break
+
+ msg = ''.join(msg).split('\n')[0]
+ # The message might have arguments that will be appended
+ # as a '|' separated list after the message type
+ args = msg.split("|")
+ msg = args.pop(0)
+
+ dmsg = base64.b64decode(msg)
+ dargs = []
+ for arg in args:
+ darg = base64.b64decode(arg)
+ dargs.append(darg.rstrip())
+
+ return (dmsg.rstrip(), dargs)
+
+def send_reply(conn, reply):
+ encoded = base64.b64encode(reply)
+ conn.send("%s\n" % encoded)
+
+def stop_action():
+ return "STOP-ACK"
+
+def passfd_action(fd, args):
+ """ Sends the file descriptor associated to the TAP device
+ to another process through a unix socket.
+ """
+ address = args.pop(0)
+ print(address)
+ sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
+ sock.connect(address)
+ passfd.sendfd(sock, fd, '0')
+ return "PASSFD-ACK"
+
+def get_options():
+ usage = ("usage: %prog -t <vif-type> -a <ip4-address> -n <net-prefix> "
+ "-s <snat> -p <pointopoint> -q <txqueuelen> -f <vif-name-file> "
+ "-S <socket-name>")
+
+ parser = OptionParser(usage = usage)
+
+ parser.add_option("-t", "--vif-type", dest="vif_type",
+ help = "Virtual interface type. Either IFF_TAP or IFF_TUN. "
+ "Defaults to IFF_TAP. ", type="str")
+
+ parser.add_option("-a", "--ip4-address", dest="ip4_address",
+ help = "IPv4 address to assign to interface. It must belong to the "
+ "network segment owned by the slice, given by the vsys_vnet tag. ",
+ type="str")
+
+ parser.add_option("-n", "--net-prefix", dest="net_prefix",
+ help = "IPv4 network prefix for the interface. It must be the one "
+ "given by the slice's vsys_vnet tag. ",
+ type="int")
+
+ parser.add_option("-s", "--snat", dest="snat", default = False,
+ action="store_true", help="Enable SNAT for the interface")
+
+ parser.add_option("-p", "--pointopoint", dest="pointopoint",
+ help = "Peer end point for the interface ", default = None,
+ type="str")
+
+ parser.add_option("-q", "--txqueuelen", dest="txqueuelen",
+ help = "Size of transmision queue. Defaults to 0.",
+ default = 0,
+ type="int")
+
+ parser.add_option("-f", "--vif-name-file", dest="vif_name_file",
+ help = "File to store the virtual interface name assigned by the OS",
+ default = "vif_name", type="str")
+
+ parser.add_option("-S", "--socket-name", dest="socket_name",
+ help = "Name for the unix socket used to interact with this process",
+ type="str")
+
+ (options, args) = parser.parse_args()
+
+ vif_type = vsys.IFF_TAP
+ if options.vif_type and options.vif_type == "IFF_TUN":
+ vif_type = vsys.IFF_TUN
+
+ return (vif_type, options.ip4_address, options.net_prefix,
+ options.snat, options.pointopoint, options.txqueuelen,
+ options.vif_name_file, options.socket_name)
+
+if __name__ == '__main__':
+
+ (vif_type, ip4_address, net_prefix, snat, pointopoint,
+ txqueuelen, vif_name_file, socket_name) = get_options()
+
+ (fd, vif_name) = vsys.fd_tuntap(vif_type)
+
+ vsys.vif_up(vif_name, ip4_address, net_prefix, snat = snat,
+ pointopoint = pointopoint, txqueuelen = txqueuelen)
+
+ # Saving interface name to vif_name_file
+ with open(vif_name_file, 'w') as f:
+ f.write(vif_name)
+
+ # create unix socket to receive instructions
+ sock = create_socket(socket_name)
+ sock.listen(0)
+
+ # wait for messages to arrive and process them
+ stop = False
+
+ while not stop:
+ conn, addr = sock.accept()
+ conn.settimeout(5)
+
+ while not stop:
+ try:
+ (msg, args) = recv_msg(conn)
+ except socket.timeout as e:
+ # Ingore time-out
+ continue
+
+ if not msg:
+ # Ignore - connection lost
+ break
+
+ if msg == STOP_MSG:
+ stop = True
+ reply = stop_action()
+ elif msg == PASSFD_MSG:
+ reply = passfd_action(fd, args)
+
+ try:
+ send_reply(conn, reply)
+ except socket.error:
+ break
+
git://git.onelab.eu / nepi.git / blobdiff