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       memcpy(new_sta.bssid,f3hdr->addr3,ADDR_LEN);
 106       ret=list_search_data(&(info->sniffed_sta),&new_sta,ADDR_LEN);
 107       if((ret==L_EMPTY_LIST)|(ret==L_NO_SUCH_ELEMENT)) {
 108         list_add_element(&(info->sniffed_sta),&new_sta,sizeof(t_sta));
 109         sta=(t_sta *)info->sniffed_sta.current->data;
 110         new=1;
 111       }
 112       else sta=(t_sta *)info->sniffed_sta.current->data;
 113       // fill in stuff ...
 114       memcpy(sta->ssid,beacon_fb->ssid,beacon_fb->ssid_length);
 115       if((CAP_INFO_ESS(beacon_fb->cap_info))&
 116          (CAP_INFO_IBSS(beacon_fb->cap_info)==0)) sta->ap=AP;
 117       if(CAP_INFO_PRIVACY(beacon_fb->cap_info)) sta->wep=WEP;
 118       sta->count_mgmt++;
 119       switch_active_state(&(sta->active));
 120       if(info->mode&MODE_IEEE80211) sta->sq=0;
 121       else if(info->mode&MODE_PRISM)
 122         sta->sq=(prismhdr->signal.data)-(prismhdr->noise.data);
 123       strncpy(string,"last: beacon, source: ",MESSAGE_MAX);
 124       for(i=0;i<ADDR_LEN;i++)
 125         snprintf(&string[22+3*i],4,"%02x%c",sta->addr[i],
 126                  (i==ADDR_LEN-1)?'.':':');
 127       string[22+3*ADDR_LEN+1]=0;
 128       display_console(info,string);
 129       if(new) {
 130         snprintf(sc,MAX_SYSCALL_CHARS,
 131                  "flite 'access point found: %s'",
 132                  sta->ssid);
 133         system(sc);
 134         if(sta->wep&WEP) strncpy(sc,"flite ' crypted'",MAX_SYSCALL_CHARS);
 135         else strncpy(sc,"flite 'not crypted'",MAX_SYSCALL_CHARS);
 136         system(sc);
 137       }
 138     }
 139
 140   }
 141
 142   /* control */
 143   else if(FCTL_TYPE(package[0])==FCTL_TYPE_CTRL) {
 144     info->count_c++;
 145     display_console(info,"last: got control frame");
 146   }
 147
 148   /* data */
 149   else if(FCTL_TYPE(package[0])==FCTL_TYPE_DATA) {
 150     info->count_d++;
 151
 152     //if(FCTL_STYPE(package[0])==FCTL_STYPE_DATA) {
 153       if(FCTL_TODS(package[0])&FCTL_FROMDS(package[0])) {
 154         f4hdr=(t_frame4_hdr *)package;
 155         data=package+sizeof(t_frame4_hdr);
 156         memcpy(new_sta.addr,f4hdr->addr4,ADDR_LEN);
 157         foo=1;
 158       }
 159       else {
 160         f3hdr=(t_frame3_hdr *)package;
 161         data=package+sizeof(t_frame3_hdr);
 162         if(FCTL_TODS(package[0])) {
 163           memcpy(new_sta.addr,f3hdr->addr2,ADDR_LEN);
 164           memcpy(new_sta.bssid,f3hdr->addr1,ADDR_LEN);
 165         }
 166         else if(FCTL_FROMDS(package[0])) {
 167           memcpy(new_sta.addr,f3hdr->addr3,ADDR_LEN);
 168           memcpy(new_sta.bssid,f3hdr->addr2,ADDR_LEN);
 169         }
 170         else {
 171           memcpy(new_sta.addr,f3hdr->addr2,ADDR_LEN);
 172           memcpy(new_sta.bssid,f3hdr->addr3,ADDR_LEN);
 173         }
 174       }
 175       ret=list_search_data(&(info->sniffed_sta),&new_sta,ADDR_LEN);
 176       if((ret==L_EMPTY_LIST)|(ret==L_NO_SUCH_ELEMENT)) {
 177         list_add_element(&(info->sniffed_sta),&new_sta,sizeof(t_sta));
 178         sta=(t_sta *)info->sniffed_sta.current->data;
 179         new=1;
 180       }
 181       else sta=(t_sta *)info->sniffed_sta.current->data;
 182       // fill in stuff ...
 183       sta->count_data++;
 184       switch_active_state(&(sta->active));
 185       if(info->mode&MODE_IEEE80211) sta->sq=0;
 186       else if(info->mode&MODE_PRISM)
 187         sta->sq=(prismhdr->signal.data)-(prismhdr->noise.data);
 188       if(new) {
 189         strcpy(sc,"flite 'station found by data package'");
 190         system(sc);
 191       }
 192       if(foo) {
 193         sta->wds=1;
 194         strcpy(sc,"flite 'wds package'");
 195         system(sc);
 196       }
 197       memcpy(sta->snap,data,10);
 198       if((data[0]==0xaa)&(data[1]==0xaa)&(data[2]==0x03)&
 199          (data[3]==0x00)&(data[4]==0x00)&(data[5]==0x00)) {
 200         sta->wep=0;
 201         strcpy(sc,"flite 'not crypted'");
 202         system(sc);
 203       }
 204       else {
 205         sta->wep=WEP;
 206         strcpy(sc,"flite ' crypted'");
 207         system(sc);
 208       }
 209
 210     //}
 211
 212     display_console(info,"last: got data frame");
 213   }
 214
 215
 216 }