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/*
This file is part of GNUnet
(C) 2011 Christian Grothoff (and other contributing authors)
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.
*/
/**
* @file transport/gnunet-transport-wlan-sender.c
* @brief program to send via WLAN as much as possible (to test physical/theoretical throughput)
* @author David Brodski
*/
#include "platform.h"
#include "gnunet_protocols.h"
#include "plugin_transport_wlan.h"
#define WLAN_MTU 1500
/**
* LLC fields for better compatibility
*/
#define WLAN_LLC_DSAP_FIELD 0x1f
#define WLAN_LLC_SSAP_FIELD 0x1f
#define IEEE80211_ADDR_LEN 6 /* size of 802.11 address */
#define IEEE80211_FC0_VERSION_MASK 0x03
#define IEEE80211_FC0_VERSION_SHIFT 0
#define IEEE80211_FC0_VERSION_0 0x00
#define IEEE80211_FC0_TYPE_MASK 0x0c
#define IEEE80211_FC0_TYPE_SHIFT 2
#define IEEE80211_FC0_TYPE_MGT 0x00
#define IEEE80211_FC0_TYPE_CTL 0x04
#define IEEE80211_FC0_TYPE_DATA 0x08
/**
* function to fill the radiotap header
* @param header pointer to the radiotap header
* @param size total message size
* @return GNUNET_YES at success
*/
static int
getRadiotapHeader (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *header,
uint16_t size)
{
header->header.size = htons (size);
header->header.type = htons (GNUNET_MESSAGE_TYPE_WLAN_DATA_TO_HELPER);
header->rate = 255;
header->tx_power = 0;
header->antenna = 0;
return GNUNET_YES;
}
/**
* function to generate the wlan hardware header for one packet
* @param Header address to write the header to
* @param to_mac_addr pointer to the address of the recipient
* @param mac pointer to the mac address to send from (normally overwritten over by helper)
* @param size size of the whole packet, needed to calculate the time to send the packet
* @return GNUNET_YES if there was no error
*/
static int
getWlanHeader (struct GNUNET_TRANSPORT_WLAN_Ieee80211Frame *Header,
const struct GNUNET_TRANSPORT_WLAN_MacAddress *to_mac_addr,
const struct GNUNET_TRANSPORT_WLAN_MacAddress *mac, unsigned int size)
{
const int rate = 11000000;
Header->frame_control = htons (IEEE80211_FC0_TYPE_DATA);
Header->addr3 = mac_bssid_gnunet;
Header->addr2 = *mac;
Header->addr1 = *to_mac_addr;
Header->duration = GNUNET_htole16 ((size * 1000000) / rate + 290);
Header->llc[0] = WLAN_LLC_DSAP_FIELD;
Header->llc[1] = WLAN_LLC_SSAP_FIELD;
Header->llc[2] = 0; // FIXME
Header->llc[3] = 0; // FIXME
return GNUNET_YES;
}
int
main (int argc, char *argv[])
{
char msg_buf[WLAN_MTU];
struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *radiotap;
unsigned int temp[6];
struct GNUNET_TRANSPORT_WLAN_MacAddress inmac;
struct GNUNET_TRANSPORT_WLAN_MacAddress outmac;
int pos;
long long count;
double bytes_per_s;
time_t start;
time_t akt;
int i;
if (4 != argc)
{
fprintf (stderr,
"This program must be started with the interface and the targets and source mac as argument.\n");
fprintf (stderr,
"Usage: interface-name mac-target mac-source\n"
"e.g. mon0 11-22-33-44-55-66 12-34-56-78-90-ab\n");
return 1;
}
if (6 !=
SSCANF (argv[3], "%x-%x-%x-%x-%x-%x", &temp[0], &temp[1], &temp[2],
&temp[3], &temp[4], &temp[5]))
{
fprintf (stderr,
"Usage: interface-name mac-target mac-source\n"
"e.g. mon0 11-22-33-44-55-66 12-34-56-78-90-ab\n");
return 1;
}
for (i = 0; i < 6; i++)
outmac.mac[i] = temp[i];
if (6 !=
SSCANF (argv[2], "%x-%x-%x-%x-%x-%x", &temp[0], &temp[1], &temp[2],
&temp[3], &temp[4], &temp[5]))
{
fprintf (stderr,
"Usage: interface-name mac-target mac-source\n"
"e.g. mon0 11-22-33-44-55-66 12-34-56-78-90-ab\n");
return 1;
}
for (i = 0; i < 6; i++)
inmac.mac[i] = temp[i];
pid_t pid;
int commpipe[2]; /* This holds the fd for the input & output of the pipe */
/* Setup communication pipeline first */
if (pipe (commpipe))
{
fprintf (stderr,
"Failed to create pipe: %s\n",
STRERROR (errno));
exit (1);
}
/* Attempt to fork and check for errors */
if ((pid = fork ()) == -1)
{
fprintf (stderr, "Failed to fork: %s\n",
STRERROR (errno));
exit (1);
}
if (pid)
{
/* A positive (non-negative) PID indicates the parent process */
close (commpipe[0]); /* Close unused side of pipe (in side) */
setvbuf (stdout, (char *) NULL, _IONBF, 0); /* Set non-buffered output on stdout */
radiotap = (struct GNUNET_TRANSPORT_WLAN_RadiotapSendMessage *) msg_buf;
getRadiotapHeader (radiotap, WLAN_MTU);
pos = 0;
getWlanHeader (&radiotap->frame, &outmac, &inmac,
WLAN_MTU);
start = time (NULL);
count = 0;
while (1)
{
pos += write (commpipe[1], msg_buf, WLAN_MTU - pos);
if (pos % WLAN_MTU == 0)
{
pos = 0;
count++;
if (count % 1000 == 0)
{
akt = time (NULL);
bytes_per_s = count * WLAN_MTU / (akt - start);
bytes_per_s /= 1024;
printf ("send %f kbytes/s\n", bytes_per_s);
}
}
}
}
else
{
/* A zero PID indicates that this is the child process */
(void) close (0);
if (-1 == dup2 (commpipe[0], 0)) /* Replace stdin with the in side of the pipe */
fprintf (stderr, "dup2 failed: %s\n", strerror (errno));
(void) close (commpipe[1]); /* Close unused side of pipe (out side) */
/* Replace the child fork with a new process */
if (execl
("gnunet-helper-transport-wlan", "gnunet-helper-transport-wlan",
argv[1], NULL) == -1)
{
fprintf (stderr, "Could not start gnunet-helper-transport-wlan!");
_exit (1);
}
}
return 0;
}
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