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/*
weplab - Wep Key Cracker
Copyright (C) 2004 Jose Ignacio Sanchez Martin - Topo[LB]
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; either version 2, or (at your option)
any later version.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
---------
capture.c: wep capture packets
*/
#include <pcap.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "globals.h"
#include "capture.h"
#include "wep.h"
#include "debug.h"
unsigned long countCapturedWeakPackets = 0;
unsigned long countCapturedUniqWeakPackets = 0;
#define MIN_PKT_LEN 60
unsigned char *capturedWeakPacketsTable;
unsigned long countCapturedPackets = 0;
extern time_t lastTime;
extern time_t actualTime;
/* callback function that is passed to pcap_loop(..) and called each time
* a packet is recieved */
void callbackWeakPackets(u_char *dumpfile, const struct pcap_pkthdr *header, const u_char *pkt_data)
{
static t_wi_frame *wi_h;
unsigned char *iv;
unsigned int tmp;
unsigned char *pkt;
countCapturedPackets++;
pkt=(unsigned char *) pkt_data;
if (global_v.prismHeaderPresent) pkt+=144;
wi_h=(t_wi_frame *)pkt;
if (header->caplen<MIN_PKT_LEN){
if (global_v.debug>1) debug("Packet %u (%u size) is smaller than %u\n",countCapturedPackets, header->caplen, MIN_PKT_LEN);
}else if(!(wi_h->wi_frame_ctl_1&0x08)){
if (global_v.debug>1) debug("Packet %u is not a DATA type packet",countCapturedPackets);
}else
{
if (((*(((unsigned char *)wi_h)+1))&0xC0)==0xC0) iv=pkt+sizeof(t_wi_frame)+6;
else iv=pkt+sizeof(t_wi_frame);
if (global_v.debug>1){
debug("Packet %u",countCapturedPackets);
debug("---------------------------------------------");
DebugViewPacketHeaders(pkt);
debug("Key ID: %u",(unsigned int)iv[3]);
debug("Pcap Len: %u",header->caplen);
debug("---------------------------------------------\n");
}
countCapturedWeakPackets++;
if (((*(((unsigned char *)wi_h)+1))&0xC0)==0xC0) iv=pkt+sizeof(t_wi_frame)+6;
else iv=pkt+sizeof(t_wi_frame);
if (global_v.debug>1) DebugViewKey(iv,3);
tmp=((unsigned int)(((unsigned int) iv[0]) | (((unsigned int) iv[1]) << 8) | (((unsigned int) iv[2]) << 16)));
if (!capturedWeakPacketsTable[tmp]){
capturedWeakPacketsTable[tmp]=0xFF;
pcap_dump(dumpfile, header, pkt_data);
countCapturedUniqWeakPackets++;
}
}
}
void catch_intCaptureWeakPackets(int sig_num){
signal(SIGUSR1, catch_intCaptureWeakPackets);
actualTime=time(NULL);
printf("%lu total packets captured\n",countCapturedPackets);
printf("%lu wep data packets captured\n",countCapturedWeakPackets);
printf("%lu unique IV wep data packets captured\n",countCapturedUniqWeakPackets);
printf("%f%% from total IV space\n",((int) countCapturedUniqWeakPackets)/16777.216);
if (actualTime-lastTime) printf("%lu packets/s\n",(unsigned long int)countCapturedWeakPackets/(actualTime-lastTime));
}
#define HUGE_MEM_WEAKPACKETS_SIZE 104000000
void captureWeakPackets(void){
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *handle;
pid_t mpid;
pcap_dumper_t *dumpfile;
capturedWeakPacketsTable=malloc(HUGE_MEM_WEAKPACKETS_SIZE);
if (!capturedWeakPacketsTable) {
printf("Error: not enough memmory to allocate %u",HUGE_MEM_WEAKPACKETS_SIZE);
exit (-1);
}
debug ("Setting the memmory to 0s");
memset(capturedWeakPacketsTable,0,HUGE_MEM_WEAKPACKETS_SIZE);
signal(SIGUSR1,SIG_IGN);
handle = pcap_open_live(global_v.device, global_v.caplen, 1, 0, errbuf);
if(handle == NULL)
{
printf("pcap_open_live(): %s\n",errbuf);
exit(1);
}
if (pcap_datalink(handle)!=DLT_IEEE802_11 && pcap_datalink(handle)!=DLT_PRISM_HEADER){
printf("ERROR: datalink type is not DLT_IEEE802.11 or PRISM_HEADER. Maybe you need to configure monitor mode in your wireless card\n");
exit(1);
}
if (pcap_datalink(handle)==DLT_PRISM_HEADER){
printf("Prismheader detected. Remember to use --prismheader when using this capture file\n");
}
dumpfile = pcap_dump_open(handle, global_v.packetsFilename);
if(dumpfile==NULL){
fprintf(stderr,"\nError opening output file %s\n",global_v.packetsFilename);
exit(1);
}
printf("\nPacket capture started! Please hit enter to get statistics.\n");
fflush(stdout);
lastTime=time(NULL);
if (!(mpid=fork())){
signal(SIGUSR1, catch_intCaptureWeakPackets);
pcap_loop(handle,-1,callbackWeakPackets,(unsigned char *)dumpfile);
pcap_dump_flush(dumpfile);
pcap_dump_close(dumpfile);
printf("Shuting down sniffer...\n");
}else{
printf("\n => Press 'q' to stop sniffing\n\n");
while (!waitpid(0,NULL,WNOHANG)) {
if (getchar()=='q') break;
kill(mpid,SIGUSR1);
}
pcap_dump_flush(dumpfile);
pcap_dump_close(dumpfile);
printf("Shuting down sniffer...\n");
}
pcap_close(handle);
}
void captureWepDataPackets(void){
printf("Shuting down sniffer...\n");
}
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