8 files changed, 612 insertions, 2 deletions
diff --git a/gnuradio-core/src/lib/io/Makefile.am b/gnuradio-core/src/lib/io/Makefile.am
index d935619a1c..6891f3807a 100644
--- a/gnuradio-core/src/lib/io/Makefile.am
+++ b/gnuradio-core/src/lib/io/Makefile.am
@@ -50,7 +50,9 @@ libio_la_SOURCES = 			\
 	microtune_xxxx_eval_board.cc	\
 	ppio.cc				\
 	ppio_ppdev.cc			\
-	sdr_1000.cc			
+	sdr_1000.cc			\
+	gr_udp_sink.cc			\
+	gr_udp_source.cc
 
 grinclude_HEADERS = 			\
 	gr_file_sink.h			\
@@ -93,4 +95,6 @@ swiginclude_HEADERS =			\
 	microtune_4702_eval_board.i	\
 	microtune_4937_eval_board.i	\
 	ppio.i				\
-	sdr_1000.i			
+	sdr_1000.i			\
+	gr_udp_sink.i			\
+	gr_udp_source.i
diff --git a/gnuradio-core/src/lib/io/gr_udp_sink.cc b/gnuradio-core/src/lib/io/gr_udp_sink.cc
new file mode 100644
index 0000000000..f5eefdc73f
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_sink.cc
@@ -0,0 +1,157 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_udp_sink.h>
+#include <gr_io_signature.h>
+#include <cstdio>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdexcept>
+
+#define SNK_VERBOSE 0
+
+gr_udp_sink::gr_udp_sink (size_t itemsize, 
+			  const char *ipaddrl, unsigned short portl,
+			  const char *ipaddrr, unsigned short portr,
+			  unsigned int mtu)
+  : gr_sync_block ("udp_sink",
+		   gr_make_io_signature (1, 1, itemsize),
+		   gr_make_io_signature (0, 0, 0)),
+    d_itemsize (itemsize), d_updated(false), d_mtu(mtu)
+{
+  // Set up the address stucture for the local address and port numbers
+  inet_aton(ipaddrl, &d_ipaddr_local);     // format IP address
+  inet_aton(ipaddrr, &d_ipaddr_remote);    // format IP address
+  d_port_local  = htons(portl);            // format port number
+  d_port_remote = htons(portr);            // format port number
+
+  d_sockaddr_local.sin_family = AF_INET;
+  d_sockaddr_local.sin_addr   = d_ipaddr_local;
+  d_sockaddr_local.sin_port   = d_port_local;
+
+  d_sockaddr_remote.sin_family = AF_INET;
+  d_sockaddr_remote.sin_addr   = d_ipaddr_remote;
+  d_sockaddr_remote.sin_port   = d_port_remote;
+  
+  open();
+}
+
+// public constructor that returns a shared_ptr
+
+gr_udp_sink_sptr
+gr_make_udp_sink (size_t itemsize, 
+		  const char *ipaddrl, unsigned short portl,
+		  const char *ipaddrr, unsigned short portr,
+		  unsigned int mtu)
+{
+  return gr_udp_sink_sptr (new gr_udp_sink (itemsize, 
+						      ipaddrl, portl,
+						      ipaddrr, portr,
+						      mtu));
+}
+
+gr_udp_sink::~gr_udp_sink ()
+{
+  close();
+}
+
+bool
+gr_udp_sink::open()
+{
+  omni_mutex_lock l(d_mutex);	// hold mutex for duration of this function
+
+  // create socket
+  if((d_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == NULL) {
+    perror("socket open");
+    throw std::runtime_error("can't open socket");
+  }
+
+  // Turn on reuse address
+  bool opt_val = true;
+  if(setsockopt(d_socket, SOL_SOCKET, SO_REUSEADDR, (void*)&opt_val, sizeof(int))) {
+    perror("SO_REUSEADDR");
+    throw std::runtime_error("can't set socket option SO_REUSEADDR");
+  }
+
+  // Don't wait when shutting down
+  linger lngr;
+  lngr.l_onoff  = 1;
+  lngr.l_linger = 0;
+  if(setsockopt(d_socket, SOL_SOCKET, SO_LINGER, (void*)&lngr, sizeof(linger))) {
+    perror("SO_LINGER");
+    throw std::runtime_error("can't set socket option SO_LINGER");
+  }
+
+  // bind socket to an address and port number to listen on
+  if(bind (d_socket, (sockaddr*)&d_sockaddr_local, sizeof(struct sockaddr))) {
+    perror("socket bind");
+    throw std::runtime_error("can't bind socket");
+  }
+
+  // Not sure if we should throw here or allow retries
+  if(connect(d_socket, (sockaddr*)&d_sockaddr_remote, sizeof(struct sockaddr))) {
+    perror("socket connect");
+    throw std::runtime_error("can't connect to socket");
+  }
+
+  d_updated = true;
+  return d_socket != 0;
+}
+
+void
+gr_udp_sink::close()
+{
+  omni_mutex_lock l(d_mutex);	// hold mutex for duration of this function
+
+  if (d_socket){
+    shutdown(d_socket, SHUT_RDWR);
+    d_socket = 0;
+  }
+  d_updated = true;
+}
+
+int 
+gr_udp_sink::work (int noutput_items,
+		   gr_vector_const_void_star &input_items,
+		   gr_vector_void_star &output_items)
+{
+  char *in = (char *) input_items[0];
+  socklen_t bytes=0, bytes_sent=0, bytes_to_send=0;
+  unsigned int total_size = noutput_items*d_itemsize;
+
+  while(bytes_sent < total_size) {
+    bytes_to_send = (bytes_sent+d_mtu < total_size ? d_mtu : total_size-bytes_sent);
+    bytes =send(d_socket, (in+bytes_sent), bytes_to_send, MSG_DONTWAIT);
+    bytes_sent += bytes;
+  }
+
+  #if SNK_VERBOSE
+  printf("Sent: %d bytes (noutput_items: %d)\n", bytes_sent, noutput_items);
+  #endif
+
+  return noutput_items;
+}
diff --git a/gnuradio-core/src/lib/io/gr_udp_sink.h b/gnuradio-core/src/lib/io/gr_udp_sink.h
new file mode 100644
index 0000000000..f3ededa524
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_sink.h
@@ -0,0 +1,103 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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.
+ */
+
+#ifndef INCLUDED_GR_UDP_SINK_H
+#define INCLUDED_GR_UDP_SINK_H
+
+#include <gr_sync_block.h>
+#include <omnithread.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+class gr_udp_sink;
+typedef boost::shared_ptr<gr_udp_sink> gr_udp_sink_sptr;
+
+/*!
+ * \brief Write stream to an Udp port (over UDP).
+ * \ingroup sink
+ */
+
+gr_udp_sink_sptr
+gr_make_udp_sink (size_t itemsize, 
+		  const char *ipaddrl, unsigned short portl,
+		  const char *ipaddrr, unsigned short portr,
+		  unsigned int mtu=540);
+
+class gr_udp_sink : public gr_sync_block
+{
+  friend gr_udp_sink_sptr gr_make_udp_sink (size_t itemsize, 
+					    const char *ipaddrl, unsigned short portl,
+					    const char *ipaddrr, unsigned short portr,
+					    unsigned int mtu);
+ private:
+  size_t	d_itemsize;
+  bool		d_updated;
+  omni_mutex	d_mutex;
+
+  unsigned int   d_mtu;             // maximum transmission unit (packet length)
+  int            d_socket;          // handle to socket
+  int            d_socket_rcv;      // handle to socket retuned in the accept call
+  struct in_addr d_ipaddr_local;    // store the local IP address to use
+  struct in_addr d_ipaddr_remote;   // store the remote IP address that connected to us
+  unsigned short d_port_local;      // the port number to open for connections to this service
+  unsigned short d_port_remote;     // port number of the remove system
+  sockaddr_in    d_sockaddr_local;  // store the local sockaddr data (formatted IP address and port number)
+  sockaddr_in    d_sockaddr_remote; // store the remote sockaddr data (formatted IP address and port number)
+
+ protected:
+  gr_udp_sink (size_t itemsize, 
+		    const char *ipaddrl, unsigned short portl,
+		    const char *ipaddrr, unsigned short portr,
+		    unsigned int mtu);
+
+ public:
+  ~gr_udp_sink ();
+
+  /*!
+   * \brief open a socket specified by the port and ip address info
+   *
+   * Opens a socket, binds to the address, and makes connectionless association
+   * over UDP. If any of these fail, the fuction retuns the error and exits.
+   */
+  bool open();
+
+  /*!
+   * \brief Close current socket.
+   *
+   * Shuts down read/write on the socket
+   */
+  void close();
+
+  /*! \brief set the MTU of the socket */
+  void set_mtu(unsigned int mtu) { d_mtu = mtu; }
+
+  /*! \brief return the MTU of the socket */
+  unsigned int mtu() { return d_mtu; }
+
+  // should we export anything else?
+
+  int work (int noutput_items,
+	    gr_vector_const_void_star &input_items,
+	    gr_vector_void_star &output_items);
+};
+
+#endif /* INCLUDED_GR_UDP_SINK_H */
diff --git a/gnuradio-core/src/lib/io/gr_udp_sink.i b/gnuradio-core/src/lib/io/gr_udp_sink.i
new file mode 100644
index 0000000000..59c828dd6e
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_sink.i
@@ -0,0 +1,47 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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.
+ */
+
+
+GR_SWIG_BLOCK_MAGIC(gr,udp_sink)
+
+gr_udp_sink_sptr 
+gr_make_udp_sink (size_t itemsize, 
+		  const char *ipaddrl, unsigned short portl,
+		  const char *ipaddrr, unsigned short portr,
+		  unsigned int mtu=540);
+
+class gr_udp_sink : public gr_sync_block
+{
+ protected:
+  gr_udp_sink (size_t itemsize, 
+	       const char *ipaddrl, unsigned short portl,
+	       const char *ipaddrr, unsigned short portr,
+	       unsigned int mtu);
+
+  bool open();
+  void close();
+  void set_mtu(unsigned int mtu) { d_mtu = mtu; }
+  unsigned int mtu() { return d_mtu; }
+
+ public:
+  ~gr_udp_sink ();
+};
diff --git a/gnuradio-core/src/lib/io/gr_udp_source.cc b/gnuradio-core/src/lib/io/gr_udp_source.cc
new file mode 100644
index 0000000000..426830924c
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_source.cc
@@ -0,0 +1,160 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2006 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 2, 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gr_udp_source.h>
+#include <gr_io_signature.h>
+#include <cstdio>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdexcept>
+
+#define SRC_VERBOSE 0
+
+gr_udp_source::gr_udp_source(size_t itemsize, const char *ipaddr, 
+			     unsigned short port, unsigned int mtu)
+  : gr_sync_block ("udp_source",
+		   gr_make_io_signature(0, 0, 0),
+		   gr_make_io_signature(1, 1, itemsize)),
+    d_itemsize(itemsize), d_updated(false), d_mtu(mtu)
+{
+  // Set up the address stucture for the local address and port numbers
+  inet_aton(ipaddr, &d_ipaddr_local);     // format IP address
+  d_port_local = htons(port);             // format port number
+  
+  d_sockaddr_local.sin_family = AF_INET;
+  d_sockaddr_local.sin_addr   = d_ipaddr_local;
+  d_sockaddr_local.sin_port   = d_port_local;
+  
+  open();
+}
+
+gr_udp_source_sptr
+gr_make_udp_source (size_t itemsize, const char *ipaddr, 
+		    unsigned short port, unsigned int mtu)
+{
+  return gr_udp_source_sptr (new gr_udp_source (itemsize, ipaddr, 
+						port, mtu));
+}
+
+gr_udp_source::~gr_udp_source ()
+{
+  close();
+}
+
+bool
+gr_udp_source::open()
+{
+  omni_mutex_lock l(d_mutex);	// hold mutex for duration of this function
+   
+  // create socket
+  d_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+  if(d_socket == 0) {
+    perror("socket open");
+    throw std::runtime_error("can't open socket");
+  }
+
+  // Turn on reuse address
+  bool opt_val = true;
+  if(setsockopt(d_socket, SOL_SOCKET, SO_REUSEADDR, (void*)&opt_val, sizeof(int))) {
+    perror("SO_REUSEADDR");
+    throw std::runtime_error("can't set socket option SO_REUSEADDR");
+  }
+
+  // Don't wait when shutting down
+  linger lngr;
+  lngr.l_onoff  = 1;
+  lngr.l_linger = 0;
+  if(setsockopt(d_socket, SOL_SOCKET, SO_LINGER, (void*)&lngr, sizeof(linger))) {
+    perror("SO_LINGER");
+    throw std::runtime_error("can't set socket option SO_LINGER");
+  }
+
+  // Set a timeout on the receive function to not block indefinitely
+  // This value can (and probably should) be changed
+  timeval timeout;
+  timeout.tv_sec = 1;
+  timeout.tv_usec = 0;
+  if(setsockopt(d_socket, SOL_SOCKET, SO_RCVTIMEO, (void*)&timeout, sizeof(timeout))) {
+    perror("SO_RCVTIMEO");
+    throw std::runtime_error("can't set socket option SO_RCVTIMEO");
+  }
+
+  // bind socket to an address and port number to listen on
+  if(bind (d_socket, (sockaddr*)&d_sockaddr_local, sizeof(struct sockaddr))) {
+    perror("socket bind");
+    throw std::runtime_error("can't bind socket");
+  }
+  
+  d_updated = true;
+  return d_socket != 0;
+}
+
+void
+gr_udp_source::close()
+{
+  omni_mutex_lock l(d_mutex);	// hold mutex for duration of this function
+
+  if (d_socket){
+    shutdown(d_socket, SHUT_RDWR);
+    d_socket = 0;
+  }
+  d_updated = true;
+}
+
+int 
+gr_udp_source::work (int noutput_items,
+		     gr_vector_const_void_star &input_items,
+		     gr_vector_void_star &output_items)
+{
+  char *out = (char *) output_items[0];
+  socklen_t bytes_to_receive=0, bytes_received=0;
+  int bytes=0;
+
+  while((bytes_received < (unsigned)noutput_items) && (bytes>-1)) {
+    // caclulate the number of byte left if we can fit in all d_mtu bytes
+    bytes_to_receive = (bytes_received+d_mtu < noutput_items ? 
+			d_mtu : noutput_items-bytes_received);
+    
+    // get the data into our output buffer and record the number of bytes
+    // This is a blocking call, but it's timeout has been set in the constructor
+    bytes = recv(d_socket, out, bytes_to_receive, 0);
+
+    if(bytes > 0) {
+      // keep track of the total number of bytes received
+      bytes_received += bytes;
+
+      // increment the pointer
+      out += bytes;
+    }
+  }
+
+  #if SRC_VERBOSE
+  printf("\nTotal Bytes Received: %d (noutput_items=%d)\n", bytes_received, noutput_items); 
+  #endif
+
+  return int(bytes_received / d_itemsize);
+}
diff --git a/gnuradio-core/src/lib/io/gr_udp_source.h b/gnuradio-core/src/lib/io/gr_udp_source.h
new file mode 100644
index 0000000000..162eef7d64
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_source.h
@@ -0,0 +1,92 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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.
+ */
+
+#ifndef INCLUDED_GR_UDP_SOURCE_H
+#define INCLUDED_GR_UDP_SOURCE_H
+
+#include <gr_sync_block.h>
+#include <omnithread.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+
+class gr_udp_source;
+typedef boost::shared_ptr<gr_udp_source> gr_udp_source_sptr;
+
+gr_udp_source_sptr gr_make_udp_source(size_t itemsize, const char *ipaddr, 
+				      unsigned short port, unsigned int mtu=540);
+
+class gr_udp_source : public gr_sync_block
+{
+  friend gr_udp_source_sptr gr_make_udp_source(size_t itemsize, const char *ipaddr, 
+					       unsigned short port, unsigned int mtu);
+
+ private:
+  size_t	d_itemsize;
+  bool		d_updated;
+  omni_mutex	d_mutex;
+
+  unsigned int   d_mtu;           // maximum transmission unit (packet length)
+  int            d_socket;        // handle to socket
+  int            d_socket_rcv;    // handle to socket retuned in the accept call
+  struct in_addr d_ipaddr_local;  // store the local IP address to use
+  struct in_addr d_ipaddr_remote; // store the remote IP address that connected to us
+  unsigned short d_port_local;    // the port number to open for connections to this service
+  unsigned short d_port_remote;   // port number of the remove system
+  sockaddr_in    d_sockaddr_local;  // store the local sockaddr data (formatted IP address and port number)
+  sockaddr_in    d_sockaddr_remote; // store the remote sockaddr data (formatted IP address and port number)
+  
+ protected:
+  gr_udp_source(size_t itemsize, const char *ipaddr, unsigned short port, unsigned int mtu);
+
+ public:
+  ~gr_udp_source();
+
+  /*!
+   * \brief open a socket specified by the port and ip address info
+   *
+   * Opens a socket, binds to the address, and waits for a connection
+   * over UDP. If any of these fail, the fuction retuns the error and exits.
+   */
+  bool open();
+
+  /*!
+   * \brief Close current socket.
+   *
+   * Shuts down read/write on the socket
+   */
+  void close();
+
+  /*! \brief set the MTU of the socket */
+  void set_mtu(unsigned int mtu) { d_mtu = mtu; }
+
+  /*! \brief return the MTU of the socket */
+  unsigned int mtu() { return d_mtu; }
+
+  // should we export anything else?
+
+  int work(int noutput_items,
+	   gr_vector_const_void_star &input_items,
+	   gr_vector_void_star &output_items);
+};
+
+
+#endif /* INCLUDED_GR_UDP_SOURCE_H */
diff --git a/gnuradio-core/src/lib/io/gr_udp_source.i b/gnuradio-core/src/lib/io/gr_udp_source.i
new file mode 100644
index 0000000000..e1e9c20236
--- /dev/null
+++ b/gnuradio-core/src/lib/io/gr_udp_source.i
@@ -0,0 +1,43 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004 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 2, 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.
+ */
+
+GR_SWIG_BLOCK_MAGIC(gr,udp_source)
+
+gr_udp_source_sptr 
+gr_make_udp_source (size_t itemsize, const char *ipaddr, 
+		    unsigned short port, unsigned int mtu=540);
+
+class gr_udp_source : public gr_sync_block
+{
+ protected:
+  gr_udp_source (size_t itemsize, const char *ipaddr, 
+		 unsigned short port, unsigned int mtu);
+
+ public:
+  ~gr_udp_source ();
+
+  bool open();
+  void close();
+  void set_mtu(unsigned int mtu) { d_mtu = mtu; }
+  unsigned int mtu() { return d_mtu; }
+
+};
diff --git a/gnuradio-core/src/lib/io/io.i b/gnuradio-core/src/lib/io/io.i
index 015e208018..e6ed4c6a15 100644
--- a/gnuradio-core/src/lib/io/io.i
+++ b/gnuradio-core/src/lib/io/io.i
@@ -34,6 +34,8 @@
 #include <ppio.h>
 #include <gr_message_source.h>
 #include <gr_message_sink.h>
+#include <gr_udp_sink.cc>
+#include <gr_udp_source.cc>
 
 %}
 
@@ -49,4 +51,6 @@
 %include "ppio.i"
 %include "gr_message_source.i"
 %include "gr_message_sink.i"
+%include "gr_udp_sink.i"
+%include "gr_udp_source.i"