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-rw-r--r--noncore/net/wellenreiter/daemon/source/sniffer.cc18
1 files changed, 14 insertions, 4 deletions
diff --git a/noncore/net/wellenreiter/daemon/source/sniffer.cc b/noncore/net/wellenreiter/daemon/source/sniffer.cc
index 65c8579..be64d67 100644
--- a/noncore/net/wellenreiter/daemon/source/sniffer.cc
+++ b/noncore/net/wellenreiter/daemon/source/sniffer.cc
@@ -1,337 +1,347 @@
/*
* rfmon mode sniffer
* This works only with cisco wireless cards with an rfmon
* able driver and not with wifi stuff.
*
* $Id$
*/
#include "config.hh"
#include "cardmode.hh"
#include "sniffer.hh"
#include "ieee802_11.hh"
#include "extract.hh"
int main(void)
{
if(card_into_monitormode (SNIFFER_DEVICE, CARD_TYPE_NG) < 0)
return 0;
start_sniffing (SNIFFER_DEVICE);
return 1;
}
int start_sniffing (char * device)
{
- pcap_t *handletopcap;
- char errbuf[PCAP_ERRBUF_SIZE];
+ pcap_t *handletopcap; /* The handle to the libpcap */
+ char errbuf[PCAP_ERRBUF_SIZE]; /* The errorbuffer of libpacap */
+ struct pcap_pkthdr header; /* The packet header from pcap*/
+ const u_char *packet; /* The actual packet content*/
/* opening the pcap for sniffing */
handletopcap = pcap_open_live(device, BUFSIZ, 1, 1000, errbuf);
#ifdef HAVE_PCAP_NONBLOCK
pcap_setnonblock(handletopcap, 1, errstr);
#endif
/*start scanning */
- pcap_loop(handletopcap,-1,process_packets,NULL);
+// pcap_loop(handletopcap,-1,process_packets,NULL);
+ /* Loope endless */
+ while(1)
+ {
+ /* Grab one single packet */
+ packet = pcap_next(handletopcap, &header);
+
+ /* process the packet */
+ process_packets(NULL,&header,*&packet);
+ }
printf("\nDone processing packets... wheew!\n");
return 1;
}
void process_packets(u_char *useless,const struct pcap_pkthdr* pkthdr,const u_char* packet)
{
u_int caplen = pkthdr->caplen;
u_int length = pkthdr->len;
u_int16_t fc;
u_int HEADER_LENGTH;
/* pinfo holds all interresting information for us */
struct packetinfo pinfo;
struct packetinfo *pinfoptr;
pinfoptr=&pinfo;
pinfoptr->isvalid = 0;
pinfoptr->pktlen = pkthdr->len;
if (caplen < IEEE802_11_FC_LEN)
{
/* This is a garbage packet, because is does not long enough
to hold a 802.11b header */
pinfoptr->isvalid = 0;
return;
}
/* Gets the framecontrol bits (2bytes long) */
fc = EXTRACT_LE_16BITS(packet);
HEADER_LENGTH = GetHeaderLength(fc);
if (caplen < HEADER_LENGTH)
{
/* This is a garbage packet, because it is not long enough
to hold a correct header of its type */
pinfoptr->isvalid = 0;
return;
}
/* Decode 802.11b header out of the packet */
if (decode_80211b_hdr(packet,pinfoptr) == 0)
{
/* Justification of the ofset to further process the packet */
length -= HEADER_LENGTH;
caplen -= HEADER_LENGTH;
packet += HEADER_LENGTH;
}
else
{ /* Something is wrong,could not be a correct packet */
return;
}
switch (FC_TYPE(fc))
{
/* Is it a managemnet frame? */
case T_MGMT:
switch (FC_SUBTYPE(fc))
{ /* Is it a beacon frame? */
case ST_BEACON:
if (handle_beacon(fc, packet,pinfoptr) ==0)
{
- printf ("\n\tOn network : %s",pinfoptr->ssid);
if (!strcmp(pinfoptr->desthwaddr,"ff:ff:ff:ff:ff:ff") == 0)
{
/* Every beacon must have the broadcast as destination
so it must be a shitti packet */
pinfoptr->isvalid = 0;
return;
}
if (pinfoptr->cap_ESS == pinfoptr->cap_IBSS)
{
/* Only one of both are possible, so must be
a noise packet, if this comes up */
pinfoptr->isvalid = 0;
return;
}
if (pinfoptr->channel < 1 || pinfoptr->channel > 14)
{
/* Only channels between 1 and 14 are possible
others must be noise packets */
pinfoptr->isvalid = 0;
return;
}
/* Here should be the infos to the gui issued */
if (pinfoptr->cap_ESS == 1 &&pinfoptr->cap_IBSS ==0)
{
printf ("\nHave found an accesspoint:");
}
else if(pinfoptr->cap_ESS == 0 && pinfoptr->cap_IBSS == 1)
{
printf ("\nHave found an AD-HOC station:");
}
if (strcmp (pinfoptr->ssid,NONBROADCASTING) ==0)
{
printf ("\n\tOn a non-broadcasting network");
}
else
{
printf ("\n\tOn network : %s",pinfoptr->ssid);
}
printf ("\n\tLen SSID : %d",pinfoptr->ssid_len);
printf ("\n\tOn Channel : %d",pinfoptr->channel);
printf ("\n\tEncryption : %s", pinfoptr->cap_WEP ? "ON" : "OFF");
printf ("\n\tMacaddress : %s",pinfoptr->sndhwaddr);
printf ("\n\tBssid : %s",pinfoptr->bssid);
printf ("\n\tDest : %s\n",pinfoptr->desthwaddr);
}
break;
default:
printf("Unknown IEEE802.11 frame subtype (%d)",FC_SUBTYPE(fc));
break;
} /* End of switch over different mgt frame types */
break;
case T_CTRL:
// decode_control_frames(fc, packet);
printf ("Its a control frame");
break;
case T_DATA:
// decode_data_frames(fc, packet);
printf ("Its a date frame");
break;
default:
printf("Unknown IEEE802.11 frame type (%d)",FC_TYPE(fc));
break;
}
}
/* This decodes the 802.11b frame header out of the 802.11b packet
all the infos is placed into the packetinfo structure */
int decode_80211b_hdr(const u_char *p,struct packetinfo *ppinfo)
{
const struct mgmt_header_t *mgthdr = (const struct mgmt_header_t *) p;
ppinfo->fcsubtype = FC_SUBTYPE(mgthdr->fc);
/* Get the sender, bssid and dest mac address */
etheraddr_string(mgthdr->bssid,ppinfo->bssid);
etheraddr_string(mgthdr->da,ppinfo->desthwaddr);
etheraddr_string(mgthdr->sa,ppinfo->sndhwaddr);
ppinfo->fc_wep = FC_WEP(mgthdr->fc);
return 0;
}
void etheraddr_string(register const u_char *ep,char * text)
{
static char hex[] = "0123456789abcdef";
register u_int i, j;
register char *cp;
char buf[sizeof("00:00:00:00:00:00")];
cp = buf;
if ((j = *ep >> 4) != 0)
*cp++ = hex[j];
*cp++ = hex[*ep++ & 0xf];
for (i = 5; (int)--i >= 0;) {
*cp++ = ':';
if ((j = *ep >> 4) != 0)
*cp++ = hex[j];
*cp++ = hex[*ep++ & 0xf];
}
*cp = '\0';
strcpy(text,buf);
}
int handle_beacon(u_int16_t fc, const u_char *p,struct packetinfo *ppinfo)
{
struct mgmt_body_t pbody;
int offset = 0;
/* Get the static informations out of the packet */
memset(&pbody, 0, sizeof(pbody));
memcpy(&pbody.timestamp, p, 8);
offset += 8;
pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset);
offset += 2;
pbody.capability_info = EXTRACT_LE_16BITS(p+offset);
offset += 2;
/* Gets the different flags out of the capabilities */
ppinfo->cap_ESS = CAPABILITY_ESS(pbody.capability_info);
ppinfo->cap_IBSS = CAPABILITY_IBSS(pbody.capability_info);
ppinfo->cap_WEP = CAPABILITY_PRIVACY(pbody.capability_info);
/* Gets the tagged elements out of the packets */
while (offset + 1 < ppinfo->pktlen)
{
switch (*(p + offset))
{
case E_SSID:
memcpy(&(pbody.ssid),p+offset,2); offset += 2;
if (pbody.ssid.length > 0)
{
memcpy(&(pbody.ssid.ssid),p+offset,pbody.ssid.length); offset += pbody.ssid.length;
pbody.ssid.ssid[pbody.ssid.length]='\0';
if (strcmp((char *)pbody.ssid.ssid,"")==0)
{
ppinfo->ssid = NONBROADCASTING;
}
else
{
ppinfo->ssid = (char *)pbody.ssid.ssid;
}
ppinfo->ssid_len = pbody.ssid.length;
}
break;
case E_CHALLENGE:
memcpy(&(pbody.challenge),p+offset,2); offset += 2;
if (pbody.challenge.length > 0)
{
memcpy(&(pbody.challenge.text),p+offset,pbody.challenge.length); offset += pbody.challenge.length;
pbody.challenge.text[pbody.challenge.length]='\0';
}
break;
case E_RATES:
memcpy(&(pbody.rates),p+offset,2); offset += 2;
if (pbody.rates.length > 0) {
memcpy(&(pbody.rates.rate),p+offset,pbody.rates.length); offset += pbody.rates.length;
}
break;
case E_DS:
memcpy(&(pbody.ds),p+offset,3); offset +=3;
ppinfo->channel = pbody.ds.channel;
break;
case E_CF:
memcpy(&(pbody.cf),p+offset,8); offset +=8;
break;
case E_TIM:
memcpy(&(pbody.tim),p+offset,2); offset +=2;
memcpy(&(pbody.tim.count),p+offset,3); offset +=3;
if ((pbody.tim.length -3) > 0)
{
memcpy((pbody.tim.bitmap),p+(pbody.tim.length -3),(pbody.tim.length -3));
offset += pbody.tim.length -3;
}
break;
default:
offset+= *(p+offset+1) + 2;
break;
} /* end of switch*/
} /* end of for loop */
return 0;
} /* End of handle_beacon */
static int GetHeaderLength(u_int16_t fc)
{
int iLength=0;
switch (FC_TYPE(fc)) {
case T_MGMT:
iLength = MGMT_HEADER_LEN;
break;
case T_CTRL:
switch (FC_SUBTYPE(fc)) {
case CTRL_PS_POLL:
iLength = CTRL_PS_POLL_LEN;
break;
case CTRL_RTS:
iLength = CTRL_RTS_LEN;
break;
case CTRL_CTS:
iLength = CTRL_CTS_LEN;
break;
case CTRL_ACK:
iLength = CTRL_ACK_LEN;
break;
case CTRL_CF_END:
iLength = CTRL_END_LEN;
break;
case CTRL_END_ACK:
iLength = CTRL_END_ACK_LEN;
break;
default:
iLength = 0;
break;
}
break;
case T_DATA:
if (FC_TO_DS(fc) && FC_FROM_DS(fc))
iLength = 30;
else
iLength = 24;
break;
default:
printf("unknown IEEE802.11 frame type (%d)",
FC_TYPE(fc));
break;
}
return iLength;
}