2 This file is part of GNUnet
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file transport/gnunet_wlan_sender.c
23 * @brief program to send via WLAN as much as possible
24 * @author David Brodski
30 #include <netinet/in.h>
33 #include "gnunet/gnunet_protocols.h"
34 #include "plugin_transport_wlan.h"
39 * LLC fields for better compatibility
41 #define WLAN_LLC_DSAP_FIELD 0x1f
42 #define WLAN_LLC_SSAP_FIELD 0x1f
44 #define IEEE80211_ADDR_LEN 6 /* size of 802.11 address */
46 #define IEEE80211_FC0_VERSION_MASK 0x03
47 #define IEEE80211_FC0_VERSION_SHIFT 0
48 #define IEEE80211_FC0_VERSION_0 0x00
49 #define IEEE80211_FC0_TYPE_MASK 0x0c
50 #define IEEE80211_FC0_TYPE_SHIFT 2
51 #define IEEE80211_FC0_TYPE_MGT 0x00
52 #define IEEE80211_FC0_TYPE_CTL 0x04
53 #define IEEE80211_FC0_TYPE_DATA 0x08
57 * generic definitions for IEEE 802.11 frames
59 struct ieee80211_frame
63 u_int8_t i_addr1[IEEE80211_ADDR_LEN];
64 u_int8_t i_addr2[IEEE80211_ADDR_LEN];
65 u_int8_t i_addr3[IEEE80211_ADDR_LEN];
68 #if DEBUG_wlan_ip_udp_packets_on_air > 1
75 * function to fill the radiotap header
76 * @param header pointer to the radiotap header
77 * @return GNUNET_YES at success
80 getRadiotapHeader ( struct Radiotap_Send *header)
92 * function to generate the wlan hardware header for one packet
93 * @param Header address to write the header to
94 * @param to_mac_addr pointer to the address of the recipient
95 * @param mac pointer to the mac address to send from (normally overwritten over by helper)
96 * @param size size of the whole packet, needed to calculate the time to send the packet
97 * @return GNUNET_YES if there was no error
100 getWlanHeader (struct ieee80211_frame *Header,
101 const char *to_mac_addr, const char *mac,
105 const int rate = 11000000;
107 Header->i_fc[0] = IEEE80211_FC0_TYPE_DATA;
108 Header->i_fc[1] = 0x00;
109 memcpy (&Header->i_addr3, &mac_bssid, sizeof (mac_bssid));
110 memcpy (&Header->i_addr2, mac,
112 memcpy (&Header->i_addr1, to_mac_addr, sizeof (mac_bssid));
114 tmp16 = (uint16_t *) Header->i_dur;
115 *tmp16 = (uint16_t) htole16 ((size * 1000000) / rate + 290);
116 Header->llc[0] = WLAN_LLC_DSAP_FIELD;
117 Header->llc[1] = WLAN_LLC_SSAP_FIELD;
122 int main(int argc, char *argv[]){
123 struct GNUNET_MessageHeader *msg;
124 struct ieee80211_frame *wlan_header;
125 struct Radiotap_Send *radiotap;
127 unsigned int temp[6];
140 "This program must be started with the interface and the targets and source mac as argument.\nThis program was compiled at ----- %s ----\n",
142 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");
148 int commpipe[2]; /* This holds the fd for the input & output of the pipe */
150 /* Setup communication pipeline first */
152 fprintf(stderr,"Pipe error!\n");
156 /* Attempt to fork and check for errors */
157 if( (pid=fork()) == -1){
158 fprintf(stderr,"Fork error. Exiting.\n"); /* something went wrong */
163 /* A positive (non-negative) PID indicates the parent process */
164 close(commpipe[0]); /* Close unused side of pipe (in side) */
165 setvbuf(stdout,(char*)NULL,_IONBF,0); /* Set non-buffered output on stdout */
167 sscanf(argv[3], "%x-%x-%x-%x-%x-%x", &temp[0],&temp[1],&temp[2],&temp[3],&temp[4],&temp[5]);
168 for (i = 0; i < 6; i++){
171 sscanf(argv[2], "%x-%x-%x-%x-%x-%x", &temp[0],&temp[1],&temp[2],&temp[3],&temp[4],&temp[5]);
172 for (i = 0; i < 6; i++){
176 msg = malloc(WLAN_MTU);
177 msg->type = htons (GNUNET_MESSAGE_TYPE_WLAN_HELPER_DATA);
178 msg->size = htons (WLAN_MTU);
179 radiotap = (struct Radiotap_Send *) &msg[1];
180 wlan_header = (struct ieee80211_frame *) &radiotap[1];
183 getRadiotapHeader(radiotap);
184 getWlanHeader(wlan_header, outmac, inmac, WLAN_MTU - sizeof(struct GNUNET_MessageHeader));
188 pos += write(commpipe[1], msg, WLAN_MTU - pos);
189 if (pos % WLAN_MTU == 0){
193 if (count % 1000 == 0){
195 bytes_per_s = count * WLAN_MTU / (akt - start);
197 printf("send %f kbytes/s\n", bytes_per_s);
204 /* A zero PID indicates that this is the child process */
205 dup2(commpipe[0],0); /* Replace stdin with the in side of the pipe */
206 close(commpipe[1]); /* Close unused side of pipe (out side) */
207 /* Replace the child fork with a new process */
208 if(execl("gnunet-transport-wlan-helper","gnunet-transport-wlan-helper", argv[1], NULL) == -1){
209 fprintf(stderr,"Could not start gnunet-transport-wlan-helper!");