From 25d8f8ddb3fe5493ef2847047c1e70283b0d8af1 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan <johnathan@corganlabs.com>
Date: Wed, 27 Feb 2013 13:21:07 -0800
Subject: blocks: added gr::blocks::tuntap_pdu
Linux only
---
gr-blocks/lib/tuntap_pdu_impl.cc | 139 +++++++++++++++++++++++++++++++++++++++
1 file changed, 139 insertions(+)
create mode 100644 gr-blocks/lib/tuntap_pdu_impl.cc
(limited to 'gr-blocks/lib/tuntap_pdu_impl.cc')
diff --git a/gr-blocks/lib/tuntap_pdu_impl.cc b/gr-blocks/lib/tuntap_pdu_impl.cc
new file mode 100644
index 0000000000..1970a92b69
--- /dev/null
+++ b/gr-blocks/lib/tuntap_pdu_impl.cc
@@ -0,0 +1,139 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2013 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "tuntap_pdu_impl.h"
+#include <gr_io_signature.h>
+#include <gr_pdu.h>
+#include <boost/format.hpp>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#if (defined(linux) || defined(__linux) || defined(__linux__))
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <linux/if.h>
+#endif
+
+namespace gr {
+ namespace blocks {
+
+ tuntap_pdu::sptr
+ tuntap_pdu::make(std::string dev, int MTU)
+ {
+#if (defined(linux) || defined(__linux) || defined(__linux__))
+ return gnuradio::get_initial_sptr(new tuntap_pdu_impl(dev, MTU));
+#else
+ throw std::runtime_error("tuntap_pdu not implemented on this platform");
+#endif
+ }
+
+#if (defined(linux) || defined(__linux) || defined(__linux__))
+ tuntap_pdu_impl::tuntap_pdu_impl(std::string dev, int MTU)
+ : gr_block("tuntap_pdu",
+ gr_make_io_signature (0, 0, 0),
+ gr_make_io_signature (0, 0, 0)),
+ stream_pdu_base(MTU),
+ d_dev(dev)
+ {
+ // make the tuntap
+ char dev_cstr[1024];
+ memset(dev_cstr, 0x00, 1024);
+ strncpy(dev_cstr, dev.c_str(), std::min(sizeof(dev_cstr), dev.size()));
+
+ d_fd = tun_alloc(dev_cstr);
+ if (d_fd <= 0)
+ throw std::runtime_error("gr::tuntap_pdu::make: tun_alloc failed (are you running as root?)");
+
+ std::cout << boost::format(
+ "Allocated virtual ethernet interface: %s\n"
+ "You must now use ifconfig to set its IP address. E.g.,\n"
+ " $ sudo ifconfig %s 192.168.200.1\n"
+ "Be sure to use a different address in the same subnet for each machine.\n"
+ ) % dev % dev << std::endl;
+
+ // set up output message port
+ message_port_register_out(PDU_PORT_ID);
+ start_rxthread(this, PDU_PORT_ID);
+
+ // set up input message port
+ message_port_register_in(PDU_PORT_ID);
+ set_msg_handler(PDU_PORT_ID, boost::bind(&tuntap_pdu_impl::send, this, _1));
+ }
+
+ int
+ tuntap_pdu_impl::tun_alloc(char *dev, int flags)
+ {
+ struct ifreq ifr;
+ int fd, err;
+ const char *clonedev = "/dev/net/tun";
+
+ /* Arguments taken by the function:
+ *
+ * char *dev: the name of an interface (or '\0'). MUST have enough
+ * space to hold the interface name if '\0' is passed
+ * int flags: interface flags (eg, IFF_TUN etc.)
+ */
+
+ /* open the clone device */
+ if ((fd = open(clonedev, O_RDWR)) < 0)
+ return fd;
+
+ /* preparation of the struct ifr, of type "struct ifreq" */
+ memset(&ifr, 0, sizeof(ifr));
+
+ ifr.ifr_flags = flags; /* IFF_TUN or IFF_TAP, plus maybe IFF_NO_PI */
+
+ /* if a device name was specified, put it in the structure; otherwise,
+ * the kernel will try to allocate the "next" device of the
+ * specified type
+ */
+ if (*dev)
+ strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+
+ /* try to create the device */
+ if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0) {
+ close(fd);
+ return err;
+ }
+
+ /* if the operation was successful, write back the name of the
+ * interface to the variable "dev", so the caller can know
+ * it. Note that the caller MUST reserve space in *dev (see calling
+ * code below)
+ */
+ strcpy(dev, ifr.ifr_name);
+
+ /* this is the special file descriptor that the caller will use to talk
+ * with the virtual interface
+ */
+ return fd;
+ }
+#endif
+
+ } /* namespace blocks */
+}/* namespace gr */
--
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