implemented sniffer function in daemon.cc

7 files changed, 38 insertions, 76 deletions

diff --git a/noncore/net/wellenreiter/daemon/source/Makefile b/noncore/net/wellenreiter/daemon/source/Makefile
index bcbc799..f3f41f0 100644
--- a/noncore/net/wellenreiter/daemon/source/Makefile
+++ b/noncore/net/wellenreiter/daemon/source/Makefile
@@ -1,33 +1,28 @@
 # $Id$
 
         CPP       = g++
 
         OPTIMFLAGS= -g
         WARNFLAGS= -Wall  -pedantic -DDEBUG
         LDFLAGS         = 
         LIBS    = -lpcap ../../libwellenreiter/source/libwellenreiter.a
-        OBJ     = daemon.o
+        OBJ     = daemon.o cardmode.o sniffer.o
 
 .SUFFIXES:
         .PHONY:         all wellenreiterd clean distclean realclean
 
 %.o : %.cc
         $(CPP) $(WARNFLAGS) $(OPTIMFLAGS) -c $< -o $@
 
         all:wellenreiterd
 
         wellenreiterd:$(OBJ)
         $(CPP) $(OPTIMFLAGS) $(WARNFLAGS) $(OBJ) $(LDFLAGS) $(LIBS) -o $@
         @echo Build wellenreiterd
 
-sniffer: sniffer.o cardmode.o
-        $(CPP) $(OPTIMFLAGS) $(WARNFLAGS) sniffer.o cardmode.o $(LDFLAGS) $(LIBS) -o $@
-        @echo Build sniffer
-
-
 clean distclean realclean:
         @rm -rf wellenreiterd *~ *.o
         @echo All dependent files have been removed.
 
         daemon.o:config.hh
 
diff --git a/noncore/net/wellenreiter/daemon/source/TODO b/noncore/net/wellenreiter/daemon/source/TODO
index 39b1a05..2d72ab7 100644
--- a/noncore/net/wellenreiter/daemon/source/TODO
+++ b/noncore/net/wellenreiter/daemon/source/TODO
@@ -1,5 +1,4 @@
 implement communication protocol
 security analysis
-implement sniffer (last step)
 security analysis
 code cleanup
\ No newline at end of file
diff --git a/noncore/net/wellenreiter/daemon/source/cardmode.cc b/noncore/net/wellenreiter/daemon/source/cardmode.cc
index f84ce23..8069edc 100644
--- a/noncore/net/wellenreiter/daemon/source/cardmode.cc
+++ b/noncore/net/wellenreiter/daemon/source/cardmode.cc
@@ -1,89 +1,90 @@
 /* $Id$ */
 
+#include "config.hh"
 #include "cardmode.hh"
 
 int card_into_monitormode (char *device, int cardtype)
 {
 
         int datalink; /* used for getting the pcap datalink type */
         char CiscoRFMON[35] = "/proc/driver/aironet/";
         FILE *CISCO_CONFIG_FILE;
         char errbuf[PCAP_ERRBUF_SIZE];
         pcap_t *handle;
         
         /* Checks if we have a device to sniff on */
         if(device == NULL)
         {
                 printf ("Fatal error i did not have any interfaces to sniff on\n");
                 return 0;
-    }
+        }
 
         /* Setting the prmiscous and up flag to the interface */
         if (card_set_promisc_up (device) == 0)
         {
                 printf ("Interface flags correctly set using ifconfig\n");
         }
 
         /* Check the cardtype and executes the commands to go into monitor mode */
         if (cardtype == CARD_TYPE_CISCO) /* I got a cisco card */
         {
                 /* bring the sniffer into rfmon  mode */
                 snprintf(CiscoRFMON, sizeof(CiscoRFMON),DEFAULT_PATH, device);
                 CISCO_CONFIG_FILE = fopen(CiscoRFMON,"w");
                 fputs ("Mode: r",CISCO_CONFIG_FILE);
                 fputs ("Mode: y",CISCO_CONFIG_FILE);
                 fputs ("XmitPower: 1",CISCO_CONFIG_FILE);
                 fclose(CISCO_CONFIG_FILE);
         }
         else if (cardtype == CARD_TYPE_NG)
         {
                 char wlanngcmd[62];
                 snprintf(wlanngcmd, sizeof(wlanngcmd),"%s %s lnxreq_wlansniff channel=1 enable=true",WLANCTL_PATH,device);
                 if (system (wlanngcmd) != 0)
                 {
                         printf ("\n Fatal error could not set %s in raw mode, check cardtype\n\n\tterminating now...\n\n",device);
                         exit(1);
             }
         }
         else if (cardtype == CARD_TYPE_HOSTAP)
         {
                 printf ("Got a host-ap card, nothing is implemented now\n");
         }
 
         
         /* Check the interface if it is in the correct raw mode */
     handle = pcap_open_live(device, BUFSIZ, 1, 0, errbuf);
 
         /* getting the datalink type */
     datalink = pcap_datalink(handle);
 
         if (datalink == DLT_IEEE802_11) /* Rawmode is IEEE802_11 */
         {
                 printf ("Your successfully listen on %s in 802.11 raw mode\n",device);
                 pcap_close(handle); 
                 return 0;
 
         }
         else 
         {
                 printf ("Fatal error, cannot continue, your interface %s does not work in the correct 802.11 raw mode, check you driver please\n\tterminating now",device);
                 pcap_close(handle); 
                 exit(1);
         }
 }
 
 
 
 int card_set_promisc_up (char * device)
 {
         int ret;
         char ifconfigcmd[32];
         snprintf(ifconfigcmd,sizeof(ifconfigcmd),SBIN_PATH, device);
         ret = system (ifconfigcmd);
         if (ret > 0)
         {
                 printf ("\nFatal error, could not execute %s please check your card,binary location and permission\n",ifconfigcmd);
                 return 0;
         }
         return 1;
 }
diff --git a/noncore/net/wellenreiter/daemon/source/cardmode.hh b/noncore/net/wellenreiter/daemon/source/cardmode.hh
index 87284a1..ecc97b1 100644
--- a/noncore/net/wellenreiter/daemon/source/cardmode.hh
+++ b/noncore/net/wellenreiter/daemon/source/cardmode.hh
@@ -1,36 +1,34 @@
 /* $Id$ */
 
 #ifndef CARDMODE_HH
 #define CARDMODE_HH
 
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <pcap.h>  
 #include <errno.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <net/bpf.h>
 
-#endif /* CARDMODE_HH */
-
 /* Defines, used for the card setup */
 #define   DEFAULT_PATH       "/proc/driver/aironet/%s/Config"
         #define   CARD_TYPE_CISCO1
         #define   CARD_TYPE_NG2
         #define   CARD_TYPE_HOSTAP3
 
 /* only for now, until we have the daemon running */
 /*the config file should provide these information */
         #define   SNIFFER_DEVICE "wlan0"
 #define CARD_TYPE CARD_TYPE_CISCO
         #define   SBIN_PATH"/sbin/ifconfig %s promisc up"
 #define WLANCTL_PATH   "/sbin/wlanctl-ng"
 
 /* Prototypes */
 
 int card_into_monitormode (char * device, int cardtype);
 int card_set_promisc_up (char * device);
 
-
+#endif /* CARDMODE_HH */
diff --git a/noncore/net/wellenreiter/daemon/source/daemon.cc b/noncore/net/wellenreiter/daemon/source/daemon.cc
index b3a37b6..1f9e98a 100644
--- a/noncore/net/wellenreiter/daemon/source/daemon.cc
+++ b/noncore/net/wellenreiter/daemon/source/daemon.cc
@@ -1,81 +1,95 @@
 /*
  * Startup functions of wellenreiter
  *
  * $Id$
  */
 
 #include "config.hh"
 #include "daemon.hh"
+#include "cardmode.hh"
+#include "sniffer.hh"
 
 /* Main function of wellenreiterd */
 int main(int argc, char **argv)
 {
-  int sock, maxfd, guiport=GUIPORT;
-  char guihost[]="127.0.0.1";
+  int sock, maxfd;
   struct sockaddr_in *cliaddr;
   socklen_t len=sizeof(struct sockaddr);
   char buffer[128];
-  FILE *fp=stdin; /* Will be replaced with sniffer */
+  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*/
+
   fd_set rset;
 
   fprintf(stderr, "wellenreiterd %s\n\n", VERSION);
 
+  /* will be replaced soon, just for max because max is lazy :-) */
+  if(card_into_monitormode (SNIFFER_DEVICE, CARD_TYPE_NG) < 0)
+  {
+    fprintf(stderr, "Cannot set card into mon mode, aborting\n");
+    exit(-1);
+  }
+
+  /* opening the pcap for sniffing */
+  handletopcap = pcap_open_live(SNIFFER_DEVICE, BUFSIZ, 1, 1000, errbuf);
+#ifdef HAVE_PCAP_NONBLOCK
+  pcap_setnonblock(handletopcap, 1, errstr);
+#endif
+
   /* Setup socket for incoming commands */
   if((sock=commsock(DAEMONADDR, DAEMONPORT)) < 0)
   {
     wl_logerr("Cannot setup socket");
     exit(-1);
   }
   wl_loginfo("Set up socket '%d' for GUI communication", sock);
 
   FD_ZERO(&rset);
 
   /* Start main loop */
   wl_loginfo("Starting main loop");
   while(1)
   {
 
     FD_SET(sock, &rset);
-    FD_SET(fileno(fp), &rset);
-    maxfd=sock+fileno(fp)+1;
+    FD_SET(pcap_fileno(handletopcap), &rset);
+    maxfd=sock + pcap_fileno(handletopcap) + 1;
     if(select(maxfd, &rset, NULL, NULL, NULL) < 0)
     {
       wl_logerr("Error calling select: %s", strerror(errno));
       break;
     }     
 
     /* Got data on local socket from GUI */
     if(FD_ISSET(sock, &rset))
     {
       memset(buffer, 0, sizeof(buffer));
       if(recvfrom(sock, buffer, sizeof(buffer)-1, 0, (struct sockaddr *)cliaddr, &len) < 0)
       {
          wl_logerr("Cannot read from socket: %s", strerror(errno));
          break;
       }
       wl_loginfo("Received command from '%s': %s", inet_ntoa(cliaddr->sin_addr), buffer); 
 
-      /* Pass string to analyze function */
-      //      sendcomm(guihost, guiport, buffer);
+      /* will be passed to analyze function */
+      fprintf(stderr, "Received command: %s\n", buffer);
 
     }
 
-    /* Will be replaced with sniffer ... later */
-    if(FD_ISSET(fileno(fp), &rset))
+    /* Pcap stuff */
+    if(FD_ISSET(pcap_fileno(handletopcap), &rset))
     {
-      memset(buffer, 0, sizeof(buffer));
-      if(fgets(buffer, sizeof(buffer) - 1, fp) == NULL)
-      {
-         wl_logerr("Cannot read from stdin: %s", strerror(errno));
-         break;
-      }
-      wl_loginfo("Sending command to '%s': %s", GUIADDR, buffer);
 
-      /* Send string to GUI */
-      sendcomm(guihost, guiport, "%d: %s", 1234, buffer);
+      /* Grab one single packet */
+      packet = pcap_next(handletopcap, &header);
+
+      /* process the packet */
+      process_packets(NULL,&header,*&packet);
 
     }
   }
   close(sock);
   exit(0);
 }
diff --git a/noncore/net/wellenreiter/daemon/source/sniffer.cc b/noncore/net/wellenreiter/daemon/source/sniffer.cc
index be64d67..66d5b6f 100644
--- a/noncore/net/wellenreiter/daemon/source/sniffer.cc
+++ b/noncore/net/wellenreiter/daemon/source/sniffer.cc
@@ -1,347 +1,308 @@
 /* 
  *  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;     /* 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);
-        /* 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)
                                         {
                                                 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 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;
 }
diff --git a/noncore/net/wellenreiter/daemon/source/sniffer.hh b/noncore/net/wellenreiter/daemon/source/sniffer.hh
index d262353..7e1e3be 100644
--- a/noncore/net/wellenreiter/daemon/source/sniffer.hh
+++ b/noncore/net/wellenreiter/daemon/source/sniffer.hh
@@ -1,70 +1,64 @@
 /* $Id$ */
 
 #ifndef SNIFFER_HH
 #define SNIFFER_HH
 
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <pcap.h>  
 #include <errno.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <net/bpf.h>
 
-
 #define   NONBROADCASTING "non-broadcasting"
 
-
 /* holds all the interresting data */
 struct packetinfo
 {
         int isvalid;
         int pktlen;
         int fctype;
         int fcsubtype;
         int fc_wep;
         int cap_WEP;
         int cap_IBSS;
         int cap_ESS;
         int channel;
         char bssid[sizeof("00:00:00:00:00:00")];
         char desthwaddr[sizeof("00:00:00:00:00:00")];
         char sndhwaddr[sizeof("00:00:00:00:00:00")];
                 char *ssid;
         int ssid_len;
 };
 
-
-/* Prototypes */
-int sniffer(void);
-int start_sniffing (char * device);
 void process_packets(u_char *useless,const struct pcap_pkthdr* pkthdr,const u_char* packet);
 int decode_80211b_hdr(const u_char *p,struct packetinfo *ppinfo);
 void etheraddr_string(register const u_char *ep,char * text);
 int handle_beacon(u_int16_t fc, const u_char *p,struct packetinfo *ppinfo);
 
-static int GetHeaderLength(u_int16_t fc);
+int GetHeaderLength(u_int16_t fc);
 
 /*
  * True if  "l" bytes of "var" were captured.
  *
  * The "snapend - (l) <= snapend" checks to make sure "l" isn't so large
  * that "snapend - (l)" underflows.
  *
  * The check is for <= rather than < because "l" might be 0.
  */
 #define TTEST2(var, l) (snapend - (l) <= snapend && \
                         (const u_char *)&(var) <= snapend - (l))
 
 /* True if "var" was captured */
 #define TTEST(var) TTEST2(var, sizeof(var))
 
 /* Bail if "l" bytes of "var" were not captured */
 #define TCHECK2(var, l) if (!TTEST2(var, l)) goto trunc
 
 /* Bail if "var" was not captured */
 #define TCHECK(var) TCHECK2(var, sizeof(var))
 
 #endif /* SNIFFER_HH */