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openwifi/user_space/inject_80211/inject_80211.c

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// Modified by: Michael Mehari
// SPDX-FileCopyrightText: 2020 UGent
// SPDX-FileCopyrightText: 2007 Andy Green <andy@warmcat.com>
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This program 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; version 2.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// Thanks for contributions:
// 2007-03-15 fixes to getopt_long code by Matteo Croce rootkit85@yahoo.it
#include "inject_80211.h"
#include "radiotap.h"
#define BUF_SIZE_MAX (1536)
#define BUF_SIZE_TOTAL (BUF_SIZE_MAX+1) // +1 in case the sprintf insert the last 0
/* wifi bitrate to use in 500kHz units */
static const u8 u8aRatesToUse[] = {
6*2,
9*2,
12*2,
18*2,
24*2,
36*2,
48*2,
54*2
};
/* this is the template radiotap header we send packets out with */
static const u8 u8aRadiotapHeader[] =
{
0x00, 0x00, // <-- radiotap version
0x1c, 0x00, // <- radiotap header length
0x6f, 0x08, 0x08, 0x00, // <-- bitmap
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // <-- timestamp
0x00, // <-- flags (Offset +0x10)
0x6c, // <-- rate (0ffset +0x11)
0x71, 0x09, 0xc0, 0x00, // <-- channel
0xde, // <-- antsignal
0x00, // <-- antnoise
0x01, // <-- antenna
0x02, 0x00, 0x0f, // <-- MCS
};
#define OFFSET_RATE 0x11
#define MCS_OFFSET 0x19
#define GI_OFFSET 0x1a
#define MCS_RATE_OFFSET 0x1b
/* IEEE80211 header */
static u8 ieee_hdr_data[] =
{
0x08, 0x02, 0x00, 0x00, // FC 0x0801. 0--subtype; 8--type&version; 02--toDS0 fromDS1 (data packet from DS to STA)
0x66, 0x55, 0x44, 0x33, 0x22, 0x11, // BSSID/MAC of AP
0x66, 0x55, 0x44, 0x33, 0x22, 0x22, // Source address (STA)
0x66, 0x55, 0x44, 0x33, 0x22, 0x33, // Destination address (another STA under the same AP)
0x10, 0x86, // 0--fragment number; 0x861=2145--sequence number
};
static u8 ieee_hdr_mgmt[] =
{
0x00, 0x00, 0x00, 0x00, // FC 0x0000. 0--subtype; 0--type&version;
0x66, 0x55, 0x44, 0x33, 0x22, 0x11, // BSSID/MAC of AP
0x66, 0x55, 0x44, 0x33, 0x22, 0x22, // Source address (STA)
0x66, 0x55, 0x44, 0x33, 0x22, 0x33, // Destination address (another STA under the same AP)
0x10, 0x86, // 0--fragment number; 0x861=2145--sequence number
};
static u8 ieee_hdr_ack_cts[] =
{
0xd4, 0x00, 0x00, 0x00, // FC 0xd400. d--subtype; 4--type&version;
0x66, 0x55, 0x44, 0x33, 0x22, 0x11, // mac addr of the peer
};
static u8 ieee_hdr_rts[] =
{
0xb4, 0x00, 0x00, 0x00, // FC 0xb400. b--subtype; 4--type&version;
0x66, 0x55, 0x44, 0x33, 0x22, 0x11, // mac addr of the peer
0x66, 0x55, 0x44, 0x33, 0x22, 0x22, // mac addr of the peer
};
// Generate random string
void gen_rand_str(int size, char *rand_char)
{
int i, randNum = 0;
// Seed the random number generator with packet size
srand(size);
for (i = 0; i < size; i++)
{
// First, pick a number between 0 and 25.
randNum = 255 * (rand() / (RAND_MAX + 1.0));
if(randNum == 0)
{
i--;
continue;
}
// Type cast to character
rand_char[i] = (char) randNum;
}
rand_char[i] = '\0';
}
int flagHelp = 0;
void usage(void)
{
printf(
"(c)2006-2007 Andy Green <andy@warmcat.com> Licensed under GPL2\n"
"(r)2020 Michael Tetemke Mehari <michael.mehari@ugent.be>\n"
"(r)2022 Xianjun Jiao <xianjun.jiao@ugent.be>"
"\n"
"Usage: inject_80211 [options] <interface>\n\nOptions\n"
"-m/--hw_mode <hardware operation mode> (a,g,n)\n"
"-r/--rate_index <rate/MCS index> (0,1,2,3,4,5,6,7)\n"
"-t/--packet_type (m/c/d/r for management/control/data/reserved)\n"
"-e/--sub_type (hex value. example:\n"
" 8/A/B/C for Beacon/Disassociation/Authentication/Deauth, when packet_type m\n"
" A/B/C/D for PS-Poll/RTS/CTS/ACK, when packet_type c\n"
" 0/1/2/8 for Data/Data+CF-Ack/Data+CF-Poll/QoS-Data, when packet_type d)\n"
"-a/--addr1 <the last byte of addr1 in hex>\n"
"-b/--addr2 <the last byte of addr2 in hex>\n"
"-i/--sgi_flag (0,1)\n"
"-n/--num_packets <number of packets>\n"
"-s/--payload_size <payload size in bytes>\n"
"-d/--delay <delay between packets in usec>\n"
"-h this menu\n\n"
"Example:\n"
" iw dev wlan0 interface add mon0 type monitor && ifconfig mon0 up\n"
" inject_80211 mon0\n"
"\n");
exit(1);
}
int main(int argc, char *argv[])
{
u8 buffer[BUF_SIZE_TOTAL], addr1=1, addr2=2, sub_type=1, *ieee_hdr;
char szErrbuf[PCAP_ERRBUF_SIZE], rand_char[1484], hw_mode = 'n', packet_type = 'd';
int i, nLinkEncap = 0, r, rate_index = 0, sgi_flag = 0, num_packets = 10, payload_size = 64, packet_size, nDelay = 100000;
int ieee_hdr_len, payload_len;
pcap_t *ppcap = NULL;
while (1)
{
int nOptionIndex;
static const struct option optiona[] =
{
{ "hw_mode", required_argument, NULL, 'm' },
{ "rate_index", required_argument, NULL, 'r' },
{ "packet_type", required_argument, NULL, 't' },
{ "sub_type", required_argument, NULL, 'e' },
{ "addr1", required_argument, NULL, 'a' },
{ "addr2", required_argument, NULL, 'b' },
{ "sgi_flag", no_argument, NULL, 'i' },
{ "num_packets", required_argument, NULL, 'n' },
{ "payload_size", required_argument, NULL, 's' },
{ "delay", required_argument, NULL, 'd' },
{ "help", no_argument, &flagHelp, 1 },
{ 0, 0, 0, 0 }
};
int c = getopt_long(argc, argv, "m:r:t:e:a:b:i:n:s:d:h", optiona, &nOptionIndex);
if (c == -1)
break;
switch (c)
{
case 0: // long option
break;
case 'h':
usage();
case 'm':
hw_mode = optarg[0];
break;
case 'r':
rate_index = atoi(optarg);
break;
case 't':
packet_type = optarg[0];
break;
case 'e':
sub_type = strtol(optarg, NULL, 16);
break;
case 'a':
addr1 = strtol(optarg, NULL, 16);
break;
case 'b':
addr2 = strtol(optarg, NULL, 16);
break;
case 'i':
sgi_flag = atoi(optarg);
break;
case 'n':
num_packets = atoi(optarg);
break;
case 's':
payload_size = atoi(optarg);
break;
case 'd':
nDelay = atoi(optarg);
break;
default:
printf("unknown switch %c\n", c);
usage();
break;
}
}
if (optind >= argc)
usage();
// open the interface in pcap
szErrbuf[0] = '\0';
ppcap = pcap_open_live(argv[optind], 800, 1, 20, szErrbuf);
if (ppcap == NULL)
{
printf("Unable to open interface %s in pcap: %s\n", argv[optind], szErrbuf);
return (1);
}
nLinkEncap = pcap_datalink(ppcap);
switch (nLinkEncap)
{
case DLT_PRISM_HEADER:
printf("DLT_PRISM_HEADER Encap\n");
break;
case DLT_IEEE802_11_RADIO:
printf("DLT_IEEE802_11_RADIO Encap\n");
break;
default:
printf("!!! unknown encapsulation on %s !\n", argv[1]);
return (1);
}
pcap_setnonblock(ppcap, 1, szErrbuf);
// Fill the IEEE hdr
if (packet_type == 'd') // data packet
{
ieee_hdr_data[0] = ( ieee_hdr_data[0]|(sub_type<<4) );
ieee_hdr_data[9] = addr1;
ieee_hdr_data[15] = addr2;
ieee_hdr_data[21] = addr1;
ieee_hdr_len = sizeof(ieee_hdr_data);
ieee_hdr = ieee_hdr_data;
}
else if (packet_type == 'm') // managment packet
{
ieee_hdr_mgmt[0] = ( ieee_hdr_mgmt[0]|(sub_type<<4) );
ieee_hdr_mgmt[9] = addr1;
ieee_hdr_mgmt[15] = addr2;
ieee_hdr_mgmt[21] = addr1;
ieee_hdr_len = sizeof(ieee_hdr_mgmt);
ieee_hdr = ieee_hdr_mgmt;
}
else if (packet_type == 'c')
{
payload_size = 0;
if (sub_type == 0xC || sub_type == 0xD)
{
ieee_hdr_ack_cts[0] = ( ieee_hdr_ack_cts[0]|(sub_type<<4) );
ieee_hdr_ack_cts[9] = addr1;
ieee_hdr_len = sizeof(ieee_hdr_ack_cts);
ieee_hdr = ieee_hdr_ack_cts;
}
else if (sub_type == 0xA || sub_type == 0xB)
{
ieee_hdr_rts[0] = ( ieee_hdr_rts[0]|(sub_type<<4) );
ieee_hdr_rts[9] = addr1;
ieee_hdr_rts[15] = addr2;
ieee_hdr_len = sizeof(ieee_hdr_rts);
ieee_hdr = ieee_hdr_rts;
}
else
{
printf("!!! sub_type %x is not supported yet!\n", sub_type);
return (1);
}
}
else
{
printf("!!! packet_type %c is not supported yet!\n", packet_type);
return (1);
}
// Generate random string
gen_rand_str(payload_size+4, rand_char); //4 for space reserved for crc
payload_len = strlen(rand_char);
packet_size = sizeof(u8aRadiotapHeader) + ieee_hdr_len + payload_len;
printf("mode = 802.11%c, rate index = %d, SHORT GI = %d, number of packets = %d and packet size = %d bytes, delay = %d usec\n", hw_mode, rate_index, sgi_flag, num_packets, packet_size, nDelay);
printf("packet_type %c sub_type %x payload_len %d ieee_hdr_len %d addr1 %02x addr2 %02x\n", packet_type, sub_type, payload_len, ieee_hdr_len, addr1, addr2);
if (packet_size > BUF_SIZE_MAX) {
printf("packet_size %d > %d! Quite\n", packet_size, BUF_SIZE_MAX);
return(1);
}
// Clear storage buffer
memset(buffer, 0, sizeof (buffer));
// Insert default radiotap header
memcpy(buffer, u8aRadiotapHeader, sizeof (u8aRadiotapHeader));
// Update radiotap header (i.e. hw_mode, rate, GI)
if(hw_mode == 'g' || hw_mode == 'a')
{
buffer[OFFSET_RATE] = u8aRatesToUse[rate_index];
buffer[MCS_OFFSET] = 0x00;
}
else
{
buffer[MCS_OFFSET] = 0x07;
if(sgi_flag)
buffer[GI_OFFSET] = IEEE80211_RADIOTAP_MCS_SGI;
buffer[MCS_RATE_OFFSET] = rate_index;
}
// Insert IEEE DATA header
memcpy(buffer + sizeof(u8aRadiotapHeader), ieee_hdr, ieee_hdr_len);
// Insert IEEE DATA payload
sprintf((char *)(buffer + sizeof(u8aRadiotapHeader) + ieee_hdr_len), "%s", rand_char);
// Inject packets
for(i = 1; i <= num_packets; i++)
{
r = pcap_inject(ppcap, buffer, packet_size);
if (r != packet_size) {
perror("Trouble injecting packet");
return (1);
}
printf("number of packets sent = %d\r", i);
fflush(stdout);
if (nDelay)
usleep(nDelay);
}
printf("\n");
return (0);
}
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