11 from optparse import OptionParser, SUPPRESS_HELP
15 # Trak SIGTERM, and set global termination flag instead of dying
17 def _finalize(sig,frame):
19 TERMINATE.append(None)
20 signal.signal(signal.SIGTERM, _finalize)
22 # SIGUSR1 suspends forwading, SIGUSR2 resumes forwarding
24 def _suspend(sig,frame):
28 signal.signal(signal.SIGUSR1, _suspend)
30 def _resume(sig,frame):
34 signal.signal(signal.SIGUSR2, _resume)
36 def get_fd(socket_name):
37 # Socket to recive the file descriptor
38 fdsock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
40 address = fdsock.getsockname()
42 # Socket to connect to the pl-vif-create process
43 # and send the PASSFD message
44 sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
45 sock.connect(socket_name)
46 emsg = base64.b64encode(PASSFD_MSG)
47 eargs = base64.b64encode(address)
48 encoded = "%s|%s\n" % (emsg, eargs)
52 (fd, msg) = passfd.recvfd(fdsock)
55 reply = sock.recv(1024)
56 reply = base64.b64decode(reply)
63 usage = ("usage: %prog -t <vif-type> -S <fd-socket-name> "
64 "-l <local-port-file> -r <remote-port-file> -H <remote-host> "
67 parser = OptionParser(usage = usage)
69 parser.add_option("-t", "--vif-type", dest="vif_type",
70 help = "Virtual interface type. Either IFF_TAP or IFF_TUN. "
71 "Defaults to IFF_TAP. ", type="str")
72 parser.add_option("-S", "--fd-socket-name", dest="fd_socket_name",
73 help = "Name for the unix socket to request the TAP file descriptor",
74 default = "tap.sock", type="str")
75 parser.add_option("-l", "--local-port-file", dest="local_port_file",
76 help = "File where to store the local binded UDP port number ",
77 default = "local_port_file", type="str")
78 parser.add_option("-r", "--remote-port-file", dest="remote_port_file",
79 help = "File where to read the remote UDP port number to connect to",
80 default = "remote_port_file", type="str")
81 parser.add_option("-H", "--remote-host", dest="remote_host",
82 help = "Remote host IP",
83 default = "remote_host", type="str")
84 parser.add_option("-R", "--ret-file", dest="ret_file",
85 help = "File where to store return code (success of connection) ",
86 default = "ret_file", type="str")
88 (options, args) = parser.parse_args()
90 vif_type = vsys.IFF_TAP
91 if options.vif_type and options.vif_type == "IFF_TUN":
92 vif_type = vsys.IFF_TUN
94 return ( vif_type, options.fd_socket_name, options.local_port_file,
95 options.remote_port_file, options.remote_host,
98 if __name__ == '__main__':
100 ( vif_type, socket_name, local_port_file, remote_port_file,
101 remote_host, ret_file ) = get_options()
103 # Get the file descriptor of the TAP device from the process
105 fd = get_fd(socket_name)
106 tun = os.fdopen(int(fd), 'r+b', 0)
108 # Create a local socket to stablish the tunnel connection
109 hostaddr = socket.gethostbyname(socket.gethostname())
110 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
111 sock.bind((hostaddr, 0))
112 (local_host, local_port) = sock.getsockname()
114 # Save local port information to file
115 f = open(local_port_file, 'w')
116 f.write("%d\n" % local_port)
119 # Wait until remote port information is available
120 while not os.path.exists(remote_port_file):
123 # Read remote port from file
124 f = open(remote_port_file, 'r')
125 remote_port = f.read()
128 remote_port = remote_port.strip()
129 remote_port = int(remote_port)
131 # Connect local socket to remote port
132 sock.connect((remote_host, remote_port))
133 remote = os.fdopen(sock.fileno(), 'r+b', 0)
135 # TODO: Test connectivity!
137 # Create a ret_file to indicate success
138 f = open(ret_file, 'w')
143 # TODO: ADD parameters tunqueue, tunkqueue, cipher_key
144 tunchannel.tun_fwd(tun, remote,
145 # Planetlab TAP devices add PI headers
147 ether_mode = (vif_type == vsys.IFF_TAP),
150 TERMINATE = TERMINATE,