diff options
Diffstat (limited to 'gr-digital/examples/narrowband/tunnel.py')
| -rwxr-xr-x | gr-digital/examples/narrowband/tunnel.py | 297 |
1 files changed, 0 insertions, 297 deletions
diff --git a/gr-digital/examples/narrowband/tunnel.py b/gr-digital/examples/narrowband/tunnel.py deleted file mode 100755 index 65205b9f6..000000000 --- a/gr-digital/examples/narrowband/tunnel.py +++ /dev/null @@ -1,297 +0,0 @@ -#!/usr/bin/env python -# -# Copyright 2005,2006,2009,2011 Free Software Foundation, Inc. -# -# This file is part of GNU Radio -# -# GNU Radio 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, or (at your option) -# any later version. -# -# GNU Radio 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 GNU Radio; see the file COPYING. If not, write to -# the Free Software Foundation, Inc., 51 Franklin Street, -# Boston, MA 02110-1301, USA. -# - - -# //////////////////////////////////////////////////////////////////// -# -# This code sets up up a virtual ethernet interface (typically -# gr0), and relays packets between the interface and the GNU Radio -# PHY+MAC -# -# What this means in plain language, is that if you've got a couple -# of USRPs on different machines, and if you run this code on those -# machines, you can talk between them using normal TCP/IP -# networking. -# -# //////////////////////////////////////////////////////////////////// - - -from gnuradio import gr, digital -from gnuradio import eng_notation -from gnuradio.eng_option import eng_option -from optparse import OptionParser - -# from current dir -from receive_path import receive_path -from transmit_path import transmit_path -from uhd_interface import uhd_transmitter -from uhd_interface import uhd_receiver - -import os, sys -import random, time, struct - -#print os.getpid() -#raw_input('Attach and press enter') - -# //////////////////////////////////////////////////////////////////// -# -# Use the Universal TUN/TAP device driver to move packets to/from -# kernel -# -# See /usr/src/linux/Documentation/networking/tuntap.txt -# -# //////////////////////////////////////////////////////////////////// - -# Linux specific... -# TUNSETIFF ifr flags from <linux/tun_if.h> - -IFF_TUN = 0x0001 # tunnel IP packets -IFF_TAP = 0x0002 # tunnel ethernet frames -IFF_NO_PI = 0x1000 # don't pass extra packet info -IFF_ONE_QUEUE = 0x2000 # beats me ;) - -def open_tun_interface(tun_device_filename): - from fcntl import ioctl - - mode = IFF_TAP | IFF_NO_PI - TUNSETIFF = 0x400454ca - - tun = os.open(tun_device_filename, os.O_RDWR) - ifs = ioctl(tun, TUNSETIFF, struct.pack("16sH", "gr%d", mode)) - ifname = ifs[:16].strip("\x00") - return (tun, ifname) - - -# //////////////////////////////////////////////////////////////////// -# the flow graph -# //////////////////////////////////////////////////////////////////// - -class my_top_block(gr.top_block): - - def __init__(self, mod_class, demod_class, - rx_callback, options): - - gr.top_block.__init__(self) - - # Get the modulation's bits_per_symbol - args = mod_class.extract_kwargs_from_options(options) - symbol_rate = options.bitrate / mod_class(**args).bits_per_symbol() - - self.source = uhd_receiver(options.args, symbol_rate, - options.samples_per_symbol, - options.rx_freq, options.rx_gain, - options.spec, options.antenna, - options.verbose) - - self.sink = uhd_transmitter(options.args, symbol_rate, - options.samples_per_symbol, - options.tx_freq, options.tx_gain, - options.spec, options.antenna, - options.verbose) - - options.samples_per_symbol = self.source._sps - - self.txpath = transmit_path(mod_class, options) - self.rxpath = receive_path(demod_class, rx_callback, options) - self.connect(self.txpath, self.sink) - self.connect(self.source, self.rxpath) - - def send_pkt(self, payload='', eof=False): - return self.txpath.send_pkt(payload, eof) - - def carrier_sensed(self): - """ - Return True if the receive path thinks there's carrier - """ - return self.rxpath.carrier_sensed() - - def set_freq(self, target_freq): - """ - Set the center frequency we're interested in. - """ - - self.sink.set_freq(target_freq) - self.source.set_freq(target_freq) - - -# //////////////////////////////////////////////////////////////////// -# Carrier Sense MAC -# //////////////////////////////////////////////////////////////////// - -class cs_mac(object): - """ - Prototype carrier sense MAC - - Reads packets from the TUN/TAP interface, and sends them to the - PHY. Receives packets from the PHY via phy_rx_callback, and sends - them into the TUN/TAP interface. - - Of course, we're not restricted to getting packets via TUN/TAP, - this is just an example. - """ - - def __init__(self, tun_fd, verbose=False): - self.tun_fd = tun_fd # file descriptor for TUN/TAP interface - self.verbose = verbose - self.tb = None # top block (access to PHY) - - def set_top_block(self, tb): - self.tb = tb - - def phy_rx_callback(self, ok, payload): - """ - Invoked by thread associated with PHY to pass received packet up. - - @param ok: bool indicating whether payload CRC was OK - @param payload: contents of the packet (string) - """ - if self.verbose: - print "Rx: ok = %r len(payload) = %4d" % (ok, len(payload)) - if ok: - os.write(self.tun_fd, payload) - - def main_loop(self): - """ - Main loop for MAC. - Only returns if we get an error reading from TUN. - - FIXME: may want to check for EINTR and EAGAIN and reissue read - """ - min_delay = 0.001 # seconds - - while 1: - payload = os.read(self.tun_fd, 10*1024) - if not payload: - self.tb.send_pkt(eof=True) - break - - if self.verbose: - print "Tx: len(payload) = %4d" % (len(payload),) - - delay = min_delay - while self.tb.carrier_sensed(): - sys.stderr.write('B') - time.sleep(delay) - if delay < 0.050: - delay = delay * 2 # exponential back-off - - self.tb.send_pkt(payload) - - -# ///////////////////////////////////////////////////////////////////////////// -# main -# ///////////////////////////////////////////////////////////////////////////// - -def main(): - - mods = digital.modulation_utils.type_1_mods() - demods = digital.modulation_utils.type_1_demods() - - parser = OptionParser (option_class=eng_option, conflict_handler="resolve") - expert_grp = parser.add_option_group("Expert") - parser.add_option("-m", "--modulation", type="choice", choices=mods.keys(), - default='gmsk', - help="Select modulation from: %s [default=%%default]" - % (', '.join(mods.keys()),)) - - parser.add_option("-s", "--size", type="eng_float", default=1500, - help="set packet size [default=%default]") - parser.add_option("-v","--verbose", action="store_true", default=False) - expert_grp.add_option("-c", "--carrier-threshold", type="eng_float", default=30, - help="set carrier detect threshold (dB) [default=%default]") - expert_grp.add_option("","--tun-device-filename", default="/dev/net/tun", - help="path to tun device file [default=%default]") - - transmit_path.add_options(parser, expert_grp) - receive_path.add_options(parser, expert_grp) - uhd_receiver.add_options(parser) - uhd_transmitter.add_options(parser) - - for mod in mods.values(): - mod.add_options(expert_grp) - - for demod in demods.values(): - demod.add_options(expert_grp) - - (options, args) = parser.parse_args () - if len(args) != 0: - parser.print_help(sys.stderr) - sys.exit(1) - - # open the TUN/TAP interface - (tun_fd, tun_ifname) = open_tun_interface(options.tun_device_filename) - - # Attempt to enable realtime scheduling - r = gr.enable_realtime_scheduling() - if r == gr.RT_OK: - realtime = True - else: - realtime = False - print "Note: failed to enable realtime scheduling" - - # instantiate the MAC - mac = cs_mac(tun_fd, verbose=True) - - # build the graph (PHY) - tb = my_top_block(mods[options.modulation], - demods[options.modulation], - mac.phy_rx_callback, - options) - - mac.set_top_block(tb) # give the MAC a handle for the PHY - - if tb.txpath.bitrate() != tb.rxpath.bitrate(): - print "WARNING: Transmit bitrate = %sb/sec, Receive bitrate = %sb/sec" % ( - eng_notation.num_to_str(tb.txpath.bitrate()), - eng_notation.num_to_str(tb.rxpath.bitrate())) - - print "modulation: %s" % (options.modulation,) - print "freq: %s" % (eng_notation.num_to_str(options.tx_freq)) - print "bitrate: %sb/sec" % (eng_notation.num_to_str(tb.txpath.bitrate()),) - print "samples/symbol: %3d" % (tb.txpath.samples_per_symbol(),) - - tb.rxpath.set_carrier_threshold(options.carrier_threshold) - print "Carrier sense threshold:", options.carrier_threshold, "dB" - - print - print "Allocated virtual ethernet interface: %s" % (tun_ifname,) - print "You must now use ifconfig to set its IP address. E.g.," - print - print " $ sudo ifconfig %s 192.168.200.1" % (tun_ifname,) - print - print "Be sure to use a different address in the same subnet for each machine." - print - - - tb.start() # Start executing the flow graph (runs in separate threads) - - mac.main_loop() # don't expect this to return... - - tb.stop() # but if it does, tell flow graph to stop. - tb.wait() # wait for it to finish - - -if __name__ == '__main__': - try: - main() - except KeyboardInterrupt: - pass |