Adding a helper file for bluetooth plugin : gnunet-helper-transport-bluetooth.c

1 files changed, 1217 insertions, 0 deletions

diff --git a/src/transport/gnunet-helper-transport-bluetooth.c b/src/transport/gnunet-helper-transport-bluetooth.c
new file mode 100644
index 000000000..418cc9dec
--- /dev/null
+++ b/src/transport/gnunet-helper-transport-bluetooth.c
@@ -0,0 +1,1217 @@
+/*
+   This file is part of GNUnet.
+   (C) 2010, 2011, 2012 Christian Grothoff (and other contributing authors)
+   Copyright (c) 2007, 2008, Andy Green <andy@warmcat.com>
+   Copyright (C) 2009 Thomas d'Otreppe
+
+   GNUnet 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.
+
+   GNUnet 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 GNUnet; see the file COPYING.  If not, write to the
+   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+#include "gnunet_config.h"
+
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/hci.h>
+#include <bluetooth/hci_lib.h>
+#include <bluetooth/rfcomm.h>
+#include <bluetooth/sdp.h>
+#include <bluetooth/sdp_lib.h>
+#include <errno.h>
+#include <linux/if.h>  
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "gnunet_protocols.h"
+#include "plugin_transport_wlan.h"
+
+#define HARD_CODED_PORT_NUMBER 10
+#define HARD_CODED_PORT_NUMBER2 10
+
+/**
+ * Maximum size of a message allowed in either direction
+ * (used for our receive and sent buffers).
+ */
+#define MAXLINE 4096
+
+
+/**
+ * struct for storing the information of the hardware.  There is only
+ * one of these.
+ */
+struct HardwareInfos
+{
+
+  /**
+   * file descriptor for the rfcomm socket
+   */
+  int fd_rfcomm;
+
+  /**
+   * Name of the interface, not necessarily 0-terminated (!).
+   */
+  char iface[IFNAMSIZ];
+
+  /**
+   * MAC address of our own bluetooth interface.
+   */
+  struct GNUNET_TRANSPORT_WLAN_MacAddress pl_mac;
+};
+
+/**
+ * IO buffer used for buffering data in transit (to wireless or to stdout).
+ */
+struct SendBuffer
+{
+  /**
+   * How many bytes of data are stored in 'buf' for transmission right now?
+   * Data always starts at offset 0 and extends to 'size'.
+   */
+  size_t size;
+
+  /**
+   * How many bytes that were stored in 'buf' did we already write to the
+   * destination?  Always smaller than 'size'.
+   */
+  size_t pos;
+  
+  /**
+   * Buffered data; twice the maximum allowed message size as we add some
+   * headers.
+   */
+  char buf[MAXLINE * 2];
+};
+
+
+/**
+ * Buffer for data read from stdin to be transmitted to the bluetooth device
+ */
+static struct SendBuffer write_pout;
+
+/**
+ * Buffer for data read from the bluetooth device to be transmitted to stdout.
+ */
+static struct SendBuffer write_std;
+
+
+/* *********** specialized version of server_mst.c begins here ********** */
+/* ****** this is the same version as the one used in gnunet-helper-transport-wlan.c ****** */ 
+
+/**
+ * To what multiple do we align messages?  8 byte should suffice for everyone
+ * for now.
+ */
+#define ALIGN_FACTOR 8
+
+/**
+ * Smallest supported message.
+ */
+#define MIN_BUFFER_SIZE sizeof (struct GNUNET_MessageHeader)
+
+
+/**
+ * Functions with this signature are called whenever a
+ * complete message is received by the tokenizer.
+ *
+ * @param cls closure
+ * @param message the actual message
+ */
+typedef void (*MessageTokenizerCallback) (void *cls, 
+                                          const struct
+                                          GNUNET_MessageHeader *
+                                          message);
+
+/**
+ * Handle to a message stream tokenizer.
+ */
+struct MessageStreamTokenizer
+{
+
+  /**
+   * Function to call on completed messages.
+   */
+  MessageTokenizerCallback cb;
+
+  /**
+   * Closure for cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Size of the buffer (starting at 'hdr').
+   */
+  size_t curr_buf;
+
+  /**
+   * How many bytes in buffer have we already processed?
+   */
+  size_t off;
+
+  /**
+   * How many bytes in buffer are valid right now?
+   */
+  size_t pos;
+
+  /**
+   * Beginning of the buffer.  Typed like this to force alignment.
+   */
+  struct GNUNET_MessageHeader *hdr;
+
+};
+
+
+/**
+ * Create a message stream tokenizer.
+ *
+ * @param cb function to call on completed messages
+ * @param cb_cls closure for cb
+ * @return handle to tokenizer
+ */
+static struct MessageStreamTokenizer *
+mst_create (MessageTokenizerCallback cb,
+            void *cb_cls)
+{
+  struct MessageStreamTokenizer *ret;
+
+  ret = malloc (sizeof (struct MessageStreamTokenizer));
+  if (NULL == ret)
+  {
+    fprintf (stderr, "Failed to allocate buffer for tokenizer\n");
+    exit (1);
+  }
+  ret->hdr = malloc (MIN_BUFFER_SIZE);
+  if (NULL == ret->hdr)
+  {
+    fprintf (stderr, "Failed to allocate buffer for alignment\n");
+    exit (1);
+  }
+  ret->curr_buf = MIN_BUFFER_SIZE;
+  ret->cb = cb;
+  ret->cb_cls = cb_cls;
+  return ret;
+}
+
+
+/**
+ * Add incoming data to the receive buffer and call the
+ * callback for all complete messages.
+ *
+ * @param mst tokenizer to use
+ * @param buf input data to add
+ * @param size number of bytes in buf
+ * @return GNUNET_OK if we are done processing (need more data)
+ *         GNUNET_SYSERR if the data stream is corrupt
+ */
+static int
+mst_receive (struct MessageStreamTokenizer *mst,
+             const char *buf, size_t size)
+{
+  const struct GNUNET_MessageHeader *hdr;
+  size_t delta;
+  uint16_t want;
+  char *ibuf;
+  int need_align;
+  unsigned long offset;
+  int ret;
+
+  ret = GNUNET_OK;
+  ibuf = (char *) mst->hdr;
+  while (mst->pos > 0)
+  {
+do_align:
+    if ((mst->curr_buf - mst->off < sizeof (struct GNUNET_MessageHeader)) ||
+        (0 != (mst->off % ALIGN_FACTOR)))
+    {
+      /* need to align or need more space */
+      mst->pos -= mst->off;
+      memmove (ibuf, &ibuf[mst->off], mst->pos);
+      mst->off = 0;
+    }
+    if (mst->pos - mst->off < sizeof (struct GNUNET_MessageHeader))
+    {
+      delta =
+          GNUNET_MIN (sizeof (struct GNUNET_MessageHeader) -
+                      (mst->pos - mst->off), size);
+      memcpy (&ibuf[mst->pos], buf, delta);
+      mst->pos += delta;
+      buf += delta;
+      size -= delta;
+    }
+    if (mst->pos - mst->off < sizeof (struct GNUNET_MessageHeader))
+    {
+      return GNUNET_OK;
+    }
+    hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off];
+    want = ntohs (hdr->size);
+    if (want < sizeof (struct GNUNET_MessageHeader))
+    {
+      fprintf (stderr,
+               "Received invalid message from stdin\n");
+      exit (1);
+    }
+    if (mst->curr_buf - mst->off < want)
+    {
+      /* need more space */
+      mst->pos -= mst->off;
+      memmove (ibuf, &ibuf[mst->off], mst->pos);
+      mst->off = 0;
+    }
+    if (want > mst->curr_buf)
+    {
+      mst->hdr = realloc (mst->hdr, want);
+      if (NULL == mst->hdr)
+      {
+        fprintf (stderr, "Failed to allocate buffer for alignment\n");
+        exit (1);
+      }
+      ibuf = (char *) mst->hdr;
+      mst->curr_buf = want;
+    }
+    hdr = (const struct GNUNET_MessageHeader *) &ibuf[mst->off];
+    if (mst->pos - mst->off < want)
+    {
+      delta = GNUNET_MIN (want - (mst->pos - mst->off), size);
+      memcpy (&ibuf[mst->pos], buf, delta);
+      mst->pos += delta;
+      buf += delta;
+      size -= delta;
+    }
+    if (mst->pos - mst->off < want)
+    {
+      return GNUNET_OK;
+    }
+    mst->cb (mst->cb_cls, hdr);
+    mst->off += want;
+    if (mst->off == mst->pos)
+    {
+      /* reset to beginning of buffer, it's free right now! */
+      mst->off = 0;
+      mst->pos = 0;
+    }
+  }
+  while (size > 0)
+  {
+    if (size < sizeof (struct GNUNET_MessageHeader))
+      break;
+    offset = (unsigned long) buf;
+    need_align = (0 != offset % ALIGN_FACTOR) ? GNUNET_YES : GNUNET_NO;
+    if (GNUNET_NO == need_align)
+    {
+      /* can try to do zero-copy and process directly from original buffer */
+      hdr = (const struct GNUNET_MessageHeader *) buf;
+      want = ntohs (hdr->size);
+      if (want < sizeof (struct GNUNET_MessageHeader))
+      {
+        fprintf (stderr,
+                 "Received invalid message from stdin\n");
+        exit (1);
+      }
+      if (size < want)
+        break;                  /* or not, buffer incomplete, so copy to private buffer... */
+      mst->cb (mst->cb_cls, hdr);
+      buf += want;
+      size -= want;
+    }
+    else
+    {
+      /* need to copy to private buffer to align;
+       * yes, we go a bit more spagetti than usual here */
+      goto do_align;
+    }
+  }
+  if (size > 0)
+  {
+    if (size + mst->pos > mst->curr_buf)
+    {
+      mst->hdr = realloc (mst->hdr, size + mst->pos);
+      if (NULL == mst->hdr)
+      {
+        fprintf (stderr, "Failed to allocate buffer for alignment\n");
+        exit (1);
+      }
+      ibuf = (char *) mst->hdr;
+      mst->curr_buf = size + mst->pos;
+    }
+    if (mst->pos + size > mst->curr_buf)
+    {
+      fprintf (stderr,
+               "Assertion failed\n");
+      exit (1);
+    }
+    memcpy (&ibuf[mst->pos], buf, size);
+    mst->pos += size;
+  }
+  return ret;
+}
+
+
+/**
+ * Destroys a tokenizer.
+ *
+ * @param mst tokenizer to destroy
+ */
+static void
+mst_destroy (struct MessageStreamTokenizer *mst)
+{
+  free (mst->hdr);
+  free (mst);
+}
+
+/* *****************  end of server_mst.c clone ***************** **/
+
+
+/* ****** same crc version as the one used in gnunet-helper-transport-wlan.c ****** */ 
+
+/**
+ * Calculate crc32, the start of the calculation
+ *
+ * @param buf buffer to calc the crc
+ * @param len len of the buffer
+ * @return crc sum
+ */
+static unsigned long
+calc_crc_osdep (const unsigned char *buf, size_t len)
+{
+  static const unsigned long int crc_tbl_osdep[256] = {
+    0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F,
+    0xE963A535, 0x9E6495A3,
+    0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD,
+    0xE7B82D07, 0x90BF1D91,
+    0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB,
+    0xF4D4B551, 0x83D385C7,
+    0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9,
+    0xFA0F3D63, 0x8D080DF5,
+    0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447,
+    0xD20D85FD, 0xA50AB56B,
+    0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75,
+    0xDCD60DCF, 0xABD13D59,
+    0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
+    0xCFBA9599, 0xB8BDA50F,
+    0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11,
+    0xC1611DAB, 0xB6662D3D,
+    0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F,
+    0x9FBFE4A5, 0xE8B8D433,
+    0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D,
+    0x91646C97, 0xE6635C01,
+    0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B,
+    0x8208F4C1, 0xF50FC457,
+    0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49,
+    0x8CD37CF3, 0xFBD44C65,
+    0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7,
+    0xA4D1C46D, 0xD3D6F4FB,
+    0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5,
+    0xAA0A4C5F, 0xDD0D7CC9,
+    0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3,
+    0xB966D409, 0xCE61E49F,
+    0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
+    0xB7BD5C3B, 0xC0BA6CAD,
+    0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF,
+    0x04DB2615, 0x73DC1683,
+    0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D,
+    0x0A00AE27, 0x7D079EB1,
+    0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB,
+    0x196C3671, 0x6E6B06E7,
+    0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9,
+    0x17B7BE43, 0x60B08ED5,
+    0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767,
+    0x3FB506DD, 0x48B2364B,
+    0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55,
+    0x316E8EEF, 0x4669BE79,
+    0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703,
+    0x220216B9, 0x5505262F,
+    0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31,
+    0x2CD99E8B, 0x5BDEAE1D,
+    0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
+    0x72076785, 0x05005713,
+    0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D,
+    0x7CDCEFB7, 0x0BDBDF21,
+    0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B,
+    0x6FB077E1, 0x18B74777,
+    0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69,
+    0x616BFFD3, 0x166CCF45,
+    0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7,
+    0x4969474D, 0x3E6E77DB,
+    0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5,
+    0x47B2CF7F, 0x30B5FFE9,
+    0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693,
+    0x54DE5729, 0x23D967BF,
+    0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1,
+    0x5A05DF1B, 0x2D02EF8D
+  };
+
+  unsigned long crc = 0xFFFFFFFF;
+
+  for (; len > 0; len--, buf++)
+    crc = crc_tbl_osdep[(crc ^ *buf) & 0xFF] ^ (crc >> 8);
+  return (~crc);
+}
+
+
+/**
+ * Calculate and check crc of the bluetooth packet
+ *
+ * @param buf buffer of the packet, with len + 4 bytes of data,
+ *            the last 4 bytes being the checksum
+ * @param len length of the payload in data
+ * @return 0 on success (checksum matches), 1 on error
+ */
+static int
+check_crc_buf_osdep (const unsigned char *buf, size_t len)
+{
+  unsigned long crc;
+
+  crc = calc_crc_osdep (buf, len);
+  buf += len;
+  if (((crc) & 0xFF) == buf[0] && ((crc >> 8) & 0xFF) == buf[1] &&
+      ((crc >> 16) & 0xFF) == buf[2] && ((crc >> 24) & 0xFF) == buf[3])
+    return 0;
+  return 1;     
+}
+
+
+
+/* ************** end of crc version  ***************** */
+
+
+
+
+/**
+ * Function for assigning a port number
+ * @return 0 on success 
+ */ 
+static int
+bind_socket (int *socket)
+{
+  int port, status;
+  struct sockaddr_rc src = { 0 };
+  
+  src.rc_family = AF_BLUETOOTH;
+  src.rc_bdaddr = *BDADDR_ANY;
+  
+  /* Bind every possible port (from 0 to 30) and stop when bind doesn't fail */
+  for (port = 1; port <= 30; port++)
+  {
+    src.rc_channel = port;
+    status = bind(*socket, (struct sockaddr *)&src, sizeof(src));
+    if (status == 0)
+      return 0;
+  }
+  
+  return -1; 
+}
+
+
+//TODO
+/**
+ * Function used for creating the service record and registering it.
+ */
+static sdp_session_t*
+register_service (void) 
+{
+  /**
+   * 1. initializations
+   * 2. set the service ID, class, profile information
+   * 3. make the service record publicly nrowsable
+   * 4. register the RFCOMM channel
+   * 5. set the name, provider and description
+   * 6. register the service record to the local SDP server
+   * 7. cleanup
+   */
+  
+  //TODO: For now I will use a hard coded port number but in the end I will implement the SDP protocol 
+    
+   return NULL;
+}
+
+//TODO
+/**
+ * Function for searching and browsing for a service. This will return the 
+ * port number on which the service is running.
+ */
+ 
+static int
+searching_service (void) 
+{
+  /**
+   * 1. detect all nearby devices
+   * 2. for each device:
+   * 2.1. connect to the SDP server running
+   * 2.2. get a list of service records with the specific UUID
+   * 2.3. for each service record get a list of the protocol sequences and get 
+   *       the port number
+   */
+   
+   return 0;
+}
+
+/**
+ * Read from the socket and put the result into the buffer for transmission to 'stdout'.
+ * @param sock file descriptor for reading
+ * @param buf buffer to read to; first bytes will be the 'struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame',
+ *            followed by the actual payload
+ * @param buf_size size of the buffer
+ * @param ri where to write radiotap_rx info
+ * @return number of bytes written to 'buf'
+ */
+static ssize_t 
+read_from_the_socket (int sock, 
+            unsigned char *buf, size_t buf_size,
+            struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *ri)
+{
+ /**
+  * 1. Read from the socket in a temporary buffer (check for errors)
+  * 2. Detect if the crc exists
+  * 3. Write the result to the buffer
+  */
+  unsigned char tmpbuf[buf_size];
+  ssize_t count;
+  int len;
+  struct sockaddr_rc  rc_addr = { 0 }; 
+   
+  //count = recv (dev->fd_rfcomm, tmpbuf, buf_size, 0);   //FIXME if I use RFCOMM
+  
+  count = read (sock, tmpbuf, buf_size); 
+  
+  if (0 > count)
+  {
+    if (EAGAIN == errno)
+      return 0;
+     
+    fprintf (stderr, "Failed to read from the HCI socket: %s\n", strerror (errno));
+    return -1;
+  }
+  
+  /* Get the channel used */
+  memset (&rc_addr, 0, sizeof (rc_addr));
+  len = sizeof (rc_addr);
+  if (0 > getsockname (sock, (struct sockaddr *) &rc_addr, (socklen_t *) &len))
+  {
+    fprintf (stderr, "getsockname() call failed : %s\n", strerror (errno));
+    return -1;
+  }
+  
+  memset (ri, 0, sizeof (*ri));
+  ri->ri_channel = rc_addr.rc_channel;
+  
+  /* detect CRC32 at the end */
+  if (0 == check_crc_buf_osdep (tmpbuf, count - sizeof (uint32_t)))
+  {
+    count -= sizeof(uint32_t);
+  }
+  
+  memcpy (buf, tmpbuf, count);
+  
+  return count;
+}
+
+/**
+ * Open the bluetooth interface for reading/writing
+ *
+ * @param dev pointer to the device struct
+ * @return 0 on success
+ */
+static int
+open_device (struct HardwareInfos *dev)
+{
+  /**
+   * 1. Open a HCI socket (if RFCOMM protocol is used. If not, the HCI socket is 
+   * saved in dev->fd_hci.
+   * 2. Find the device id (request a list with all the devices and find the one
+   * with the dev->iface name)
+   * 3. If the interface is down try to get it up
+   * 4. TODO: Bind the RFCOMM socket to the interface using the bind_socket() method and register
+   * a SDP service
+   * 5. For now use a hard coded port number(channel) value
+   * FIXME : if I use HCI sockets , should I enable RAW_SOCKET MODE?!?!?!
+   */
+   
+  int i, dev_id = -1, fd_hci;
+  struct 
+  {
+    struct hci_dev_list_req list;
+    struct hci_dev_req dev[HCI_MAX_DEV];
+  } request;                      //used for detecting the local devices
+  struct sockaddr_rc rc_addr = { 0 };    //used for binding
+  
+  fd_hci = socket (AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
+
+  if (fd_hci < 0) 
+  {
+    fprintf (stderr, "Failed to create HCI socket: %s\n", strerror (errno));
+    return -1;
+  }
+        
+  memset (&request, 0, sizeof(request));
+  request.list.dev_num = HCI_MAX_DEV;
+
+  if (ioctl (fd_hci, HCIGETDEVLIST, (void *) &request) < 0)
+  {
+    fprintf (stderr, "ioctl(HCIGETDEVLIST) on interface `%.*s' failed: %s\n",
+            IFNAMSIZ, dev->iface, strerror (errno));
+    return 1;
+  }
+        
+        /* Search for a device with dev->iface name */
+  for (i = 0; i < request.list.dev_num; i++)
+  {
+    struct hci_dev_info dev_info;
+
+    memset (&dev_info, 0, sizeof(struct hci_dev_info));
+    dev_info.dev_id = request.dev[i].dev_id;
+    strncpy (dev_info.name, dev->iface, IFNAMSIZ);
+    
+    if (ioctl (fd_hci, HCIGETDEVINFO, (void *) &dev_info))
+    {
+      fprintf (stderr, "ioctl(HCIGETDEVINFO) on interface `%.*s' failed: %s\n",
+             IFNAMSIZ, dev->iface, strerror (errno));
+      return 1;
+    }
+    
+    if (strcmp (dev_info.name, dev->iface) == 0)
+    {
+      char addr[19] = { 0 };  //the device MAC address
+      
+      dev_id = dev_info.dev_id; //the device was found
+      
+      ba2str (&dev_info.bdaddr, addr); //get the device's MAC address
+      //TODO : copy the MAC address to the device structure
+      memcpy (&dev->pl_mac, &dev_info.bdaddr, sizeof (bdaddr_t));
+      
+      /* Check if the interface is UP */
+      if (hci_test_bit (HCI_UP, (void *) &dev_info.flags) == 0)
+      {
+        /* Bring interface up */ //FIXME should I check if is HCI_RUNNING ?!?!??!
+        if (ioctl (fd_hci, HCIDEVUP, dev_info.dev_id))
+        {
+          fprintf (stderr, "ioctl(HCIDEVUP) on interface `%.*s' failed: %s\n",
+             IFNAMSIZ, dev->iface, strerror (errno));
+          return 1;
+        }
+      }
+      
+      /* Check if the device is discoverable */
+      if (hci_test_bit (HCI_PSCAN, (void *) &dev_info.flags) == 0 ||
+          hci_test_bit (HCI_ISCAN, (void *) &dev_info.flags) == 0)
+      {
+        /* Set interface Page Scan and Inqury Scan ON */
+        struct hci_dev_req dev_req;
+          
+        memset (&dev_req, 0, sizeof (dev_req));
+        dev_req.dev_id = dev_info.dev_id;
+        dev_req.dev_opt = SCAN_PAGE | SCAN_INQUIRY;
+        
+        if (ioctl (fd_hci, HCISETSCAN, (unsigned long) &dev_req))
+        {  
+          fprintf (stderr, "ioctl(HCISETSCAN) on interface `%.*s' failed: %s\n",
+             IFNAMSIZ, dev->iface, strerror (errno));
+          return 1;
+        }
+        
+      }
+      
+      //FIXME : Sniff mode!?!
+      //FIXME : RAW MODE?!?
+      
+      break;
+    }
+    
+  }
+  
+  /* Check if the interface was not found */
+  if (dev_id == -1)
+  {
+    fprintf (stderr, "The interface %s was not found\n", dev->iface);
+    return 1;
+  }
+  
+  /* Close the hci socket */
+  (void) close(fd_hci);
+  
+  
+  
+  /* Bind the rfcomm socket to the interface */
+  memset (&rc_addr, 0, sizeof (rc_addr)); 
+  rc_addr.rc_family = AF_BLUETOOTH;
+  rc_addr.rc_bdaddr = *BDADDR_ANY;
+  rc_addr.rc_channel = (uint8_t) HARD_CODED_PORT_NUMBER;
+ 
+  if (bind (dev->fd_rfcomm, (struct sockaddr *) &rc_addr, sizeof (rc_addr) != 0))
+  {
+    fprintf (stderr, "Failed to bind interface `%.*s': %s\n", IFNAMSIZ,
+             dev->iface, strerror (errno));
+    return 1;
+  }
+  
+  /*
+  memset (&hci_addr, 0, sizeof (hci_addr));
+        hci_addr.hci_family = AF_BLUETOOTH;
+        hci_addr.hci_dev = dev_id;
+        */
+        /**
+         * FIXME      hci_addr.hci_channel = HARD_CODED_PORT_NUMBER 
+         * For linux kernel >= 2.6.7 the kernel automatically chooses an available port
+         * number. (getsockname() function can be used for finding out what port the kernel 
+         * chose).
+         */
+        /*
+  if (-1 == bind (dev->fd_hci, (struct sockaddr *) &hci_addr, sizeof (hci_addr)))
+  {
+    fprintf (stderr, "Failed to bind interface `%.*s': %s\n", IFNAMSIZ,
+             dev->iface, strerror (errno));
+    return 1;
+  }
+  */
+  
+  if (listen (dev->fd_rfcomm, 5) == -1)
+  {
+    fprintf (stderr, "Failed to listen on socket for interface `%.*s': %s\n", IFNAMSIZ,
+             dev->iface, strerror (errno));
+    return 3;
+  }
+  
+  
+  return 0;
+}
+
+
+/**
+ * Set the header to sane values to make attacks more difficult
+ *
+ * @param taIeeeHeader pointer to the header of the packet
+ * @param dev pointer to the Hardware_Infos struct
+ *
+ **** copy from gnunet-helper-transport-wlan.c ****
+ */
+static void
+mac_set (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *taIeeeHeader,
+         const struct HardwareInfos *dev)
+{
+  taIeeeHeader->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
+  taIeeeHeader->addr2 = dev->pl_mac;
+  taIeeeHeader->addr3 = mac_bssid_gnunet;
+}
+
+/**
+ * Test if the given interface name really corresponds to a bluetooth
+ * device.
+ *
+ * @param iface name of the interface
+ * @return 0 on success, 1 on error
+ **** similar with the one from gnunet-helper-transport-wlan.c ****
+ */
+static int
+test_bluetooth_interface (const char *iface)
+{
+  char strbuf[512];
+  struct stat sbuf;
+  int ret;
+
+  ret = snprintf (strbuf, sizeof (strbuf), 
+                  "/sys/class/bluetooth/%s/subsystem",
+                  iface);
+  if ((ret < 0) || (ret >= sizeof (strbuf)) || (0 != stat (strbuf, &sbuf)))
+  {
+    fprintf (stderr, 
+             "Did not find 802.15.1 interface `%s'. Exiting.\n", 
+             iface);
+    exit (1);
+  }
+  return 0;
+}
+
+/**
+ * Test incoming packets mac for being our own.
+ *
+ * @param taIeeeHeader buffer of the packet
+ * @param dev the Hardware_Infos struct
+ * @return 0 if mac belongs to us, 1 if mac is for another target
+ *
+ **** same as the one from gnunet-helper-transport-wlan.c ****
+ */
+static int
+mac_test (const struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *taIeeeHeader,
+          const struct HardwareInfos *dev)
+{
+  static struct GNUNET_TRANSPORT_WLAN_MacAddress all_zeros;
+
+  if ( (0 == memcmp (&taIeeeHeader->addr3, &all_zeros, MAC_ADDR_SIZE)) ||
+       (0 == memcmp (&taIeeeHeader->addr1, &all_zeros, MAC_ADDR_SIZE)) )
+    return 0; /* some drivers set no Macs, then assume it is all for us! */
+
+  if (0 != memcmp (&taIeeeHeader->addr3, &mac_bssid_gnunet, MAC_ADDR_SIZE))
+    return 1; /* not a GNUnet ad-hoc package */
+  if ( (0 == memcmp (&taIeeeHeader->addr1, &dev->pl_mac, MAC_ADDR_SIZE)) ||
+       (0 == memcmp (&taIeeeHeader->addr1, &bc_all_mac, MAC_ADDR_SIZE)) )
+    return 0; /* for us, or broadcast */
+  return 1; /* not for us */
+}
+
+
+/**
+ * Process data from the stdin.  Takes the message forces the sender MAC to be correct
+ * and puts it into our buffer for transmission to the kernel. (the other device).
+ *
+ * @param cls pointer to the device struct ('struct HardwareInfos*')
+ * @param hdr pointer to the start of the packet
+ *
+ **** same as the one from gnunet-helper-transport-wlan.c ****
+ */
+static void
+stdin_send_hw (void *cls, const struct GNUNET_MessageHeader *hdr)
+{
+  struct HardwareInfos *dev = cls;
+  const struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header;
+  struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *blueheader;
+  size_t sendsize;
+
+  sendsize = ntohs (hdr->size);
+  if ( (sendsize <
+        sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage)) ||
+       (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER != ntohs (hdr->type)) ) 
+  {
+    fprintf (stderr, "Received malformed message\n");
+    exit (1);
+  }
+  sendsize -= (sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage) - sizeof (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame));
+  if (MAXLINE < sendsize)
+  {
+    fprintf (stderr, "Packet too big for buffer\n");
+    exit (1);
+  }
+  header = (const struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) hdr;
+  memcpy (&write_pout.buf, &header->frame, sendsize);
+  blueheader = (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *) &write_pout.buf;
+
+  /* payload contains MAC address, but we don't trust it, so we'll
+  * overwrite it with OUR MAC address to prevent mischief */
+  mac_set (blueheader, dev);
+  write_pout.size = sendsize;
+}
+
+
+/**
+ * Main function of the helper.  This code accesses a bluetooth interface
+ * forwards traffic in both directions between the bluetooth interface and 
+ * stdin/stdout of this
+ * process.  Error messages are written to stdout.
+ *
+ * @param argc number of arguments, must be 2
+ * @param argv arguments only argument is the name of the interface (i.e. 'mon0')
+ * @return 0 on success (never happens, as we don't return unless aborted), 1 on error
+ *
+ **** same as the one from gnunet-helper-transport-wlan.c ****
+ */
+int
+main (int argc, char *argv[])
+{   
+  struct HardwareInfos dev;
+  char readbuf[MAXLINE];
+  char dest[18];
+  int maxfd;
+  fd_set rfds;
+  fd_set wfds;
+  int stdin_open;
+  struct MessageStreamTokenizer *stdin_mst;
+  int raw_eno, i;
+  uid_t uid;
+
+  /* assert privs so we can modify the firewall rules! */
+  uid = getuid ();
+#ifdef HAVE_SETRESUID
+  if (0 != setresuid (uid, 0, 0))
+  {
+    fprintf (stderr, "Failed to setresuid to root: %s\n", strerror (errno));
+    return 254;
+  }
+#else
+  if (0 != seteuid (0)) 
+  {
+    fprintf (stderr, "Failed to seteuid back to root: %s\n", strerror (errno));
+    return 254;
+  }
+#endif
+
+  /* make use of SGID capabilities on POSIX */
+  memset (&dev, 0, sizeof (dev));
+  dev.fd_rfcomm = socket (AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
+  //FIXME : using RFCOMM protocol : dev.fd_rfcomm = socket (AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
+  raw_eno = errno; /* remember for later */
+
+  /* now that we've dropped root rights, we can do error checking */
+  if (2 != argc)
+  {
+    fprintf (stderr,
+             "You must specify the name of the interface as the first and only argument to this program.\n");
+    if (-1 != dev.fd_rfcomm)
+      (void) close (dev.fd_rfcomm);
+    return 1;
+  }
+
+  if (-1 == dev.fd_rfcomm)
+  {
+    fprintf (stderr, "Failed to create a HCI socket: %s\n", strerror (raw_eno));
+    return 1;
+  }
+  if (dev.fd_rfcomm >= FD_SETSIZE)
+  {
+    fprintf (stderr, "File descriptor too large for select (%d > %d)\n",
+             dev.fd_rfcomm, FD_SETSIZE);
+    (void) close (dev.fd_rfcomm);
+    return 1;
+  }
+  if (0 != test_bluetooth_interface (argv[1]))
+  {
+    (void) close (dev.fd_rfcomm);
+    return 1;
+  }
+  strncpy (dev.iface, argv[1], IFNAMSIZ);
+  if (0 != open_device (&dev))
+  {
+    (void) close (dev.fd_rfcomm);
+    return 1;
+  }
+
+  /* drop privs */
+  {
+    uid_t uid = getuid ();
+#ifdef HAVE_SETRESUID
+    if (0 != setresuid (uid, uid, uid))
+    {
+      fprintf (stderr, "Failed to setresuid: %s\n", strerror (errno));
+      if (-1 != dev.fd_rfcomm)
+        (void) close (dev.fd_rfcomm);
+      return 1;
+    }
+#else
+    if (0 != (setuid (uid) | seteuid (uid)))
+    {
+      fprintf (stderr, "Failed to setuid: %s\n", strerror (errno));
+      if (-1 != dev.fd_rfcomm)
+        (void) close (dev.fd_rfcomm);
+      return 1;
+    }
+#endif
+  }
+
+
+  /* send MAC address of the bluetooth interface to STDOUT first */
+  {
+    struct GNUNET_TRANSPORT_WLAN_HelperControlMessage macmsg;
+
+    macmsg.hdr.size = htons (sizeof (macmsg));
+    macmsg.hdr.type = htons (GNUNET_MESSAGE_TYPE_WLAN_HELPER_CONTROL);
+    memcpy (&macmsg.mac, &dev.pl_mac, sizeof (struct GNUNET_TRANSPORT_WLAN_MacAddress));
+    memcpy (write_std.buf, &macmsg, sizeof (macmsg));
+    write_std.size = sizeof (macmsg);
+  }  
+
+  stdin_mst = mst_create (&stdin_send_hw, &dev);  
+  stdin_open = 1;
+  while (1)
+  {
+    maxfd = -1;
+    FD_ZERO (&rfds);
+    if ((0 == write_pout.size) && (1 == stdin_open))
+    {
+      FD_SET (STDIN_FILENO, &rfds);
+      maxfd = MAX (maxfd, STDIN_FILENO);
+    }
+    if (0 == write_std.size)
+    {
+      FD_SET (dev.fd_rfcomm, &rfds);
+      maxfd = MAX (maxfd, dev.fd_rfcomm);
+    }
+    FD_ZERO (&wfds);
+    if (0 < write_std.size)
+    {
+      FD_SET (STDOUT_FILENO, &wfds);
+      maxfd = MAX (maxfd, STDOUT_FILENO);
+    }
+    if (0 < write_pout.size)
+    {
+      int sendsocket, status;
+      struct sockaddr_rc addr = { 0 };
+      
+      memset (dest, 0, sizeof (dest));
+      
+      sendsocket = socket (AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);
+      
+      if (sendsocket < 0) 
+      {
+        fprintf (stderr, "Failed to create a RFCOMM socket (sending stage): %s\n", 
+                strerror (errno));
+        return -1;
+      }
+      
+      addr.rc_family = AF_BLUETOOTH;
+      addr.rc_channel = HARD_CODED_PORT_NUMBER2; //TODO: dinamically binding
+      str2ba(dest, &addr.rc_bdaddr);  //TODO: get the destination address from the message
+      
+      /*TODO: use a NON-BLOCKING socket
+       *      sock_flags = fcntl (sendsocket, F_GETFL, 0);
+       *      fcntl( sendsocket, F_SETFL, sock_flags | O_NONBLOCK);
+      */
+      status = connect (sendsocket, (struct sockaddr *) &addr, sizeof (addr));
+            if (0 != status && errno != EAGAIN)
+            {
+                //fprintf (stderr, "connect error on %s\n", argv[1]);
+              perror("Connect error");
+              return -1;
+            }
+      
+      FD_SET (sendsocket, &wfds);
+      maxfd = MAX (maxfd, sendsocket);
+    }
+    {
+      int retval = select (maxfd + 1, &rfds, &wfds, NULL, NULL);
+      if ((-1 == retval) && (EINTR == errno))
+        continue;
+      if (0 > retval)
+      {
+        fprintf (stderr, "select failed: %s\n", strerror (errno));
+        break;
+      }
+    }
+    
+    for (i = 0; i <= maxfd; i++)
+    {
+      if (FD_ISSET (i , &wfds))
+      {
+        if (i == STDOUT_FILENO)
+        {
+          ssize_t ret =
+              write (STDOUT_FILENO, write_std.buf + write_std.pos,
+                     write_std.size - write_std.pos);
+          if (0 > ret)
+          {
+            fprintf (stderr, "Failed to write to STDOUT: %s\n", strerror (errno));
+            break;
+          }
+          write_std.pos += ret;
+          if (write_std.pos == write_std.size)
+          {
+            write_std.pos = 0;
+            write_std.size = 0;
+          }
+        } 
+        else 
+        {
+          ssize_t ret =
+            write (i, write_pout.buf + write_std.pos, 
+                   write_pout.size - write_pout.pos);
+          if (0 > ret)
+          {
+            fprintf (stderr, "Failed to write to bluetooth device: %s\n",
+                     strerror (errno));
+            break;
+          }
+          write_pout.pos += ret;
+          if ((write_pout.pos != write_pout.size) && (0 != ret))
+          {
+            /* we should not get partial sends with packet-oriented devices... */
+            fprintf (stderr, "Write error, partial send: %u/%u\n",
+                     (unsigned int) write_pout.pos,
+                     (unsigned int) write_pout.size);
+            break;
+          }
+          if (write_pout.pos == write_pout.size)
+          {
+            write_pout.pos = 0;
+            write_pout.size = 0;
+            (void) close (i);
+          }
+        }
+      }
+
+      if (FD_ISSET (i, &rfds))
+      {
+        if (i == STDIN_FILENO)
+        {
+          ssize_t ret = 
+            read (i, readbuf, sizeof (readbuf));
+          if (0 > ret)
+          {
+            fprintf (stderr, "Read error from STDIN: %s\n", strerror (errno));
+            break;
+          }
+          if (0 == ret)
+          {
+            /* stop reading... */
+            stdin_open = 0;
+          }
+          mst_receive (stdin_mst, readbuf, ret);
+        } 
+        else if (i == dev.fd_rfcomm) 
+        {
+          int newfd;
+          struct sockaddr_rc addr = { 0 };
+          unsigned int opt = sizeof (addr);
+          
+          newfd = accept (dev.fd_rfcomm, (struct sockaddr *) &addr, &opt);
+          
+          if (newfd == -1)
+          {
+            fprintf (stderr, "Failed to accept a connection on interface: %s\n", 
+                strerror (errno));
+            return -1;
+          } else {
+            FD_SET (newfd, &rfds);
+            maxfd = MAX (maxfd, newfd);
+          }
+          
+        } 
+        else 
+        {
+          struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *rrm;
+          ssize_t ret;
+
+          rrm = (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage *) write_std.buf;
+          ret =
+              read_from_the_socket (i, (unsigned char *) &rrm->frame,
+                          sizeof (write_std.buf) 
+                          - sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage) 
+                          + sizeof (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame), 
+                          rrm);
+          if (0 > ret)
+          {
+            fprintf (stderr, "Read error from rfcomm socket: %s\n", strerror (errno));
+            break;
+          }
+          if ((0 < ret) && (0 == mac_test (&rrm->frame, &dev)))
+          {
+            write_std.size = ret 
+              + sizeof (struct GNUNET_TRANSPORT_WLAN_RadiotapReceiveMessage) 
+              - sizeof (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame);
+            rrm->header.size = htons (write_std.size);
+            rrm->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA_FROM_HELPER);
+          }
+        }
+      }
+    }
+  }
+  /* Error handling, try to clean up a bit at least */
+  mst_destroy (stdin_mst);
+  (void) close (dev.fd_rfcomm);
+  
+  return 1;                     /* we never exit 'normally' */
+  
+}
+
+
+