1 files changed, 19 insertions, 4 deletions

diff --git a/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc b/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
index 81eccab..3c227ab 100644
--- a/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
+++ b/noncore/net/wellenreiter/libwellenreiter/source/sniff.cc
@@ -1,320 +1,335 @@
 /* 
  *  rfmon mode sniffer
  *
  *  $Id$
  */
 
 #include "sniff.hh"
 #include "ieee802_11.hh"
 #include "extract.hh"
 #include "log.hh"
 #include "proto.hh"
 
 /* Main function, checks packets */
 void process_packets(const struct pcap_pkthdr *pkthdr, const unsigned char *packet, char *guihost, int guiport)
 {
   unsigned int caplen = pkthdr->caplen;
   unsigned int length = pkthdr->len;
   u_int16_t fc;
   unsigned int HEADER_LENGTH;
   
   /* pinfo holds all interresting information for us */
   struct packetinfo pinfo;
   struct packetinfo *pinfoptr;
 
   /* wl_network_t will finally be set and send to the ui */
   wl_network_t wl_net;
 
   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))
       {
         case ST_BEACON:
           if (handle_beacon(fc, packet,pinfoptr) ==0)
           {
               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)
                 {
                   wl_loginfo("Found an access point");
                   wl_net.net_type=1;
                 }
               else if(pinfoptr->cap_ESS == 0 && pinfoptr->cap_IBSS == 1) 
                 {
                   wl_loginfo("Found an ad-hoc network");
                   wl_net.net_type=2;
                 }
               if (strcmp (pinfoptr->ssid,NONBROADCASTING) ==0)
                 {
                   wl_loginfo("Net is a non-broadcasting network");
                 }
               else
                 {
                   wl_loginfo("SSID is: %s", pinfoptr->ssid);
                           //      wl_net.bssid=pinfoptr->ssid;
                 }
 
               wl_loginfo("SSID length is: %d", pinfoptr->ssid_len);
               wl_net.ssid_len=pinfoptr->ssid_len;
             
               wl_loginfo("Channel is: %d", pinfoptr->channel);
               wl_net.channel=pinfoptr->channel;
               wl_net.wep=pinfoptr->cap_WEP;
 
               wl_loginfo("Mac is: %s", pinfoptr->sndhwaddr);
               memcpy(wl_net.mac, pinfoptr->sndhwaddr, sizeof(wl_net.mac)-1);;
               wl_loginfo("SSID is: %s", pinfoptr->ssid);
               memcpy(wl_net.bssid, pinfoptr->ssid, sizeof(wl_net.bssid)-1);
 
                       //              printf ("\n\tDest   : %s\n",pinfoptr->desthwaddr);
               send_network_found((char *)guihost, guiport, &wl_net);
               wl_loginfo("Sent network to GUI '%s:%d'", guihost, guiport);
             }
                   break;
         default:
           wl_logerr("Unknown IEEE802.11 frame subtype (%d)", FC_SUBTYPE(fc));
                   break;
         } /* End of switch over different mgt frame types */
       
       break;
   
   case T_CTRL:
     wl_loginfo("Received control frame, not implemented yet");
     break;
 
   case T_DATA:
     wl_loginfo("Received date frame, not implemented yet");
     break;
 
   default:
     wl_logerr("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 unsigned int i, j;
   register char *cp;
-  char buf[sizeof("00:00:00:00:00:00")];
+  char buf[sizeof("00:00:00:00:00:00\0")];
   cp = buf;
   if ((j = *ep >> 4) != 0)
-    *cp++ = hex[j];
+  {
+          *cp++ = hex[j];
+  }
+  else
+  {
+          *cp++ = '0';
+  }
   *cp++ = hex[*ep++ & 0xf];
-  for (i = 5; (int)--i >= 0;) {
+  
+  for (i = 5; (int)--i >= 0;) 
+  {
     *cp++ = ':';
     if ((j = *ep >> 4) != 0)
-      *cp++ = hex[j];
+    {
+            *cp++ = hex[j];
+    }
+    else
+    {
+            *cp++ = '0';
+    }
+  
     *cp++ = hex[*ep++ & 0xf];
   }
   *cp = '\0';
   strcpy(text,buf);
 }
 
 /* beacon handler */
 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)
                 memcpy(ppinfo->ssid, NONBROADCASTING, sizeof(ppinfo->ssid));
               else
                   memcpy(ppinfo->ssid, pbody.ssid.ssid, sizeof(ppinfo->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 */
 
 
 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:
       wl_logerr("unknown IEEE802.11 frame type (%d)", FC_TYPE(fc));
       break;
   }
   return iLength;
 }