parse.c

   1 /*
   2  * parse.c - parsing of pcap packages
   3  *
   4  * author: hackbard@hackdaworld.dyndns.org
   5  *
   6  */
   7
   8 #include "parse.h"
   9 #include "main.h"
  10
  11 /* all the parsing stuff will go here
  12  *
  13  * different protocols should get to seperated files though ...
  14  */
  15
  16 unsigned int int_s(unsigned int val) {
  17
  18   unsigned int swapped;
  19
  20   swapped=(val&0x000000ff)<<24;
  21   swapped|=(val&0x0000ff00)<<8;
  22   swapped|=(val&0x00ff0000)>>8;
  23   swapped|=(val&0xff000000)>>24;
  24
  25   return swapped;
  26 }
  27
  28 int switch_active_state(char *state) {
  29
  30   switch(*state) {
  31     case '-':
  32       *state='\\';
  33       break;
  34     case '\\':
  35       *state='|';
  36       break;
  37     case '|':
  38       *state='/';
  39       break;
  40     default:
  41       *state='-';
  42       break;
  43   }
  44
  45   return 23;
  46 }
  47
  48 void parse_package(unsigned char *ptr,const struct pcap_pkthdr *pcap_header,const unsigned char *pkg) {
  49
  50   t_info *info;
  51   int i;
  52   t_sta new_sta;
  53   t_sta *sta;
  54   unsigned char *package=NULL;
  55   t_frame4_hdr *f4hdr;
  56   t_frame3_hdr *f3hdr;
  57   //t_frame2_hdr *f2hdr;
  58   //t_frame1_hdr *f1hdr;
  59   t_beacon_fb *beacon_fb;
  60   unsigned char *data;
  61   t_prism_hdr *prismhdr=NULL;
  62   int ret;
  63   char string[MESSAGE_MAX];
  64   char sc[MAX_SYSCALL_CHARS];
  65   unsigned char new;
  66   unsigned char foo;
  67
  68   info=(t_info *)ptr;
  69
  70   info->count++;
  71
  72   memset(&new_sta,0,sizeof(t_sta));
  73   new=0;
  74   foo=0;
  75
  76   if(info->dump_fd!=0) {
  77     ret=write(info->dump_fd,pcap_header,sizeof(struct pcap_pkthdr));
  78     if(ret!=sizeof(struct pcap_pkthdr))
  79       display_console(info,"warning, pcap header write failed!");
  80     ret=write(info->dump_fd,package,pcap_header->caplen);
  81     if(ret!=pcap_header->caplen)
  82       display_console(info,"warning, package write failed!");
  83   }
  84
  85   /* prism or ieee802.11 header ? */
  86   if(info->mode&MODE_IEEE80211) {
  87     package=(unsigned char *)pkg;
  88     prismhdr=NULL;
  89   }
  90   else if(info->mode&MODE_PRISM) {
  91     package=(unsigned char *)pkg+sizeof(t_prism_hdr);
  92     prismhdr=(t_prism_hdr *)pkg;
  93   }
  94
  95   /* management */
  96   if(FCTL_TYPE(package[0])==FCTL_TYPE_MGMT) {
  97     info->count_m++;
  98
  99     /* beacon frames */
 100     if(FCTL_STYPE(package[0])==FCTL_STYPE_BEACON) {
 101       f3hdr=(t_frame3_hdr *)package;
 102       beacon_fb=(t_beacon_fb *)(package+sizeof(t_frame3_hdr));
 103       // check sta
 104       memcpy(new_sta.addr,f3hdr->addr2,ADDR_LEN);
 105       ret=list_search_data(&(info->sniffed_sta),&new_sta,ADDR_LEN);
 106       if((ret==L_EMPTY_LIST)|(ret==L_NO_SUCH_ELEMENT)) {
 107         list_add_element(&(info->sniffed_sta),&new_sta,sizeof(t_sta));
 108         sta=(t_sta *)info->sniffed_sta.current->data;
 109         new=1;
 110       }
 111       else sta=(t_sta *)info->sniffed_sta.current->data;
 112       // fill in stuff ...
 113       memcpy(sta->ssid,beacon_fb->ssid,beacon_fb->ssid_length);
 114       if((CAP_INFO_ESS(beacon_fb->cap_info))&
 115          (CAP_INFO_IBSS(beacon_fb->cap_info)==0)) sta->ap=AP;
 116       if(CAP_INFO_PRIVACY(beacon_fb->cap_info)) sta->wep=WEP;
 117       sta->count_mgmt++;
 118       switch_active_state(&(sta->active));
 119       if(info->mode&MODE_IEEE80211) sta->sq=0;
 120       else if(info->mode&MODE_PRISM)
 121         sta->sq=(prismhdr->signal.data)-(prismhdr->noise.data);
 122       strncpy(string,"last: beacon, source: ",MESSAGE_MAX);
 123       for(i=0;i<ADDR_LEN;i++)
 124         snprintf(&string[22+3*i],4,"%02x%c",sta->addr[i],
 125                  (i==ADDR_LEN-1)?'.':':');
 126       string[22+3*ADDR_LEN+1]=0;
 127       display_console(info,string);
 128       if(new) {
 129         snprintf(sc,MAX_SYSCALL_CHARS,
 130                  "flite 'access point found: %s'",
 131                  sta->ssid);
 132         system(sc);
 133         if(sta->wep&WEP) strncpy(sc,"flite ' crypted'",MAX_SYSCALL_CHARS);
 134         else strncpy(sc,"flite 'not crypted'",MAX_SYSCALL_CHARS);
 135         system(sc);
 136       }
 137     }
 138
 139   }
 140
 141   /* control */
 142   else if(FCTL_TYPE(package[0])==FCTL_TYPE_CTRL) {
 143     info->count_c++;
 144     display_console(info,"last: got control frame");
 145   }
 146
 147   /* data */
 148   else if(FCTL_TYPE(package[0])==FCTL_TYPE_DATA) {
 149     info->count_d++;
 150
 151     //if(FCTL_STYPE(package[0])==FCTL_STYPE_DATA) {
 152       if(FCTL_TODS(package[0])&FCTL_FROMDS(package[0])) {
 153         f4hdr=(t_frame4_hdr *)package;
 154         data=package+sizeof(t_frame4_hdr);
 155         memcpy(new_sta.addr,f4hdr->addr4,ADDR_LEN);
 156         foo=1;
 157       }
 158       else {
 159         f3hdr=(t_frame3_hdr *)package;
 160         data=package+sizeof(t_frame3_hdr);
 161         if(FCTL_TODS(package[0])) {
 162           memcpy(new_sta.addr,f3hdr->addr2,ADDR_LEN);
 163           memcpy(new_sta.bssid,f3hdr->addr1,ADDR_LEN);
 164         }
 165         else if(FCTL_FROMDS(package[0])) {
 166           memcpy(new_sta.addr,f3hdr->addr3,ADDR_LEN);
 167           memcpy(new_sta.bssid,f3hdr->addr2,ADDR_LEN);
 168         }
 169         else {
 170           memcpy(new_sta.addr,f3hdr->addr2,ADDR_LEN);
 171           memcpy(new_sta.bssid,f3hdr->addr3,ADDR_LEN);
 172         }
 173       }
 174       ret=list_search_data(&(info->sniffed_sta),&new_sta,ADDR_LEN);
 175       if((ret==L_EMPTY_LIST)|(ret==L_NO_SUCH_ELEMENT)) {
 176         list_add_element(&(info->sniffed_sta),&new_sta,sizeof(t_sta));
 177         sta=(t_sta *)info->sniffed_sta.current->data;
 178         new=1;
 179       }
 180       else sta=(t_sta *)info->sniffed_sta.current->data;
 181       // fill in stuff ...
 182       sta->count_data++;
 183       switch_active_state(&(sta->active));
 184       if(info->mode&MODE_IEEE80211) sta->sq=0;
 185       else if(info->mode&MODE_PRISM)
 186         sta->sq=(prismhdr->signal.data)-(prismhdr->noise.data);
 187       if(new) {
 188         strcpy(sc,"flite 'new station. data package'");
 189         system(sc);
 190       }
 191       if(foo) {
 192         sta->wds=1;
 193         strcpy(sc,"flite 'wds package'");
 194         system(sc);
 195       }
 196       memcpy(sta->snap,data,6);
 197     //}
 198
 199     display_console(info,"last: got data frame");
 200   }
 201
 202
 203 }