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#
# Copyright 2009,2019,2020 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.
#
import socket
import os
from gnuradio import gr, blocks
def _get_sock_fd(addr, port, server):
"""
Get the file descriptor for the socket.
As a client, block on connect, dup the socket descriptor.
As a server, block on accept, dup the client descriptor.
Args:
addr: the ip address string
port: the tcp port number
server: true for server mode, false for client mode
Returns:
the file descriptor number
"""
is_ipv6 = False
if ":" in addr:
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM, 0)
is_ipv6 = True
else:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if server:
try:
if is_ipv6:
bind_addr = addr.replace("::ffff:", "")
sock.bind((bind_addr, port))
else:
sock.bind((addr, port))
gr.log.info('Waiting for a connection on port ' + str(port))
sock.listen(1)
clientsock, address = sock.accept()
return os.dup(clientsock.fileno())
except OSError as e:
gr.log.error('Unable to bind to port ' + str(port))
gr.log.error('Error: ' + e.strerror)
if is_ipv6:
gr.log.error('IPv6 HINT: If trying to start a local listener, '
'try "::" for the address.')
return None
except:
gr.log.error('Unable to bind to port ' + str(port))
return None
else:
sock.connect((addr, port))
return os.dup(sock.fileno())
class tcp_source(gr.hier_block2):
def __init__(self, itemsize, addr, port, server=True):
# init hier block
gr.hier_block2.__init__(
self, 'tcp_source',
gr.io_signature(0, 0, 0),
gr.io_signature(1, 1, itemsize),
)
fd = _get_sock_fd(addr, port, server)
self.connect(blocks.file_descriptor_source(itemsize, fd), self)
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