1 files changed, 86 insertions, 0 deletions
diff --git a/gr-network/python/network/tcp_source.py b/gr-network/python/network/tcp_source.py
new file mode 100644
index 0000000000..4e07a68497
--- /dev/null
+++ b/gr-network/python/network/tcp_source.py
@@ -0,0 +1,86 @@
+#
+# 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)