2 * hdw-sniff, sniffer using pcap lib
4 * author: hackbard@hackdaworld.dyndns.org
10 #include <sys/socket.h>
12 #include <netinet/in.h>
13 #include <arpa/inet.h>
15 #include <sys/types.h>
19 #include <sys/ioctl.h>
21 /* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */
22 #include <netinet/if_ether.h> /* for ethhdr struct */
23 #include <netinet/ip.h> /* ip */
24 #include <netinet/in.h> /* in_addr , inet_ntoa */
26 /* IEEE 802.11 stuff -- will become one include later ... */
27 #include "ieee80211.h" /* from hunz's aeolus, short hostap_wlan.h */
28 #include "ieee802_11.h" /* from pcmcia-cs */
30 #include "hdw-sniff.h" /* my functions */
32 /* global variables */
35 int main(int argc, char *argv[]) {
37 char pcap_error[PCAP_ERRBUF_SIZE];
41 struct timeval fd_set_tv;
43 struct info_struct my_info_struct;
45 /* parse the arguments */
47 printf("usage: %s <interface> <monitor mode> <logfile>\n",
52 printf("no logfile specified, writing to stdout ...\n");
55 if((file_fd=open(argv[3],O_RDWR | O_CREAT))!=0) {
56 printf("writing to logfile %s ...\n",argv[3]);
59 printf("can't open logfile!\n");
63 /* setting up device and set monitor mode */
64 if(atoi(argv[2])==1) {
65 printf("setting to monitor mode\n");
66 if(strncmp(argv[1],"wlan",4)==0)
67 sprintf(sys_call,"iwpriv %s monitor 3",argv[1]);
68 if(strncmp(argv[1],"eth",3)==0)
69 sprintf(sys_call,"ifconfig %s promisc",argv[1]);
72 printf("setting up interface\n");
73 sprintf(sys_call,"ifconfig %s up",argv[1]);
76 /* start pcap session */
77 pcap_handle=pcap_open_live(argv[1],BUFSIZ,1,-1,pcap_error);
78 if(pcap_handle==NULL) {
79 printf("%s: %s\n",argv[0],pcap_error);
83 /* set non blocking */
84 if((pcap_setnonblock(pcap_handle,1,pcap_error))==-1) {
85 printf("%s: %s\n",argv[0],pcap_error);
90 my_info_struct.count=0;
91 my_info_struct.mmode=argv[2][0];
92 my_info_struct.ssid_list=(struct list *)malloc(sizeof(struct list));
93 my_info_struct.ssid_list->next=NULL;
94 // strcpy(my_info_struct.ssid_list->ssid,"test");
95 strcpy(my_info_struct.dev,argv[1]);
97 /* prepare for select */
98 pcap_fd=pcap_fileno(pcap_handle);
100 /* create file descriptor */
101 if((foo_fd=socket(AF_INET,SOCK_DGRAM,0))==-1) {
102 printf("unable to create socket foo_fd\n");
110 FD_ZERO(&pcap_fd_set);
111 FD_SET(pcap_fd,&pcap_fd_set);
113 fd_set_tv.tv_usec=200000;
115 if((select(pcap_fd+1,&pcap_fd_set,NULL,NULL,&fd_set_tv)) && (FD_ISSET(pcap_fd,&pcap_fd_set))) pcap_dispatch(pcap_handle,-1,pcap_process,(u_char *)&my_info_struct);
116 else if((hop_channel(&my_info_struct,foo_fd))==-1) {
117 printf("channelhopping failed, aborting\n");
125 /* pcap_process callback function */
126 void pcap_process(u_char *info,const struct pcap_pkthdr *pcap_header,
127 const u_char *package) {
129 /* local variables */
130 char tmp_buf[20],tmp_buf1[10],tmp_buf2[32];
131 unsigned char crypted_snap[12];
132 struct linux_wlan_ng_prism_hdr *prism_hdr;
133 struct ieee802_11_hdr *w_hdr;
134 struct snaphdr *snap_hdr;
135 struct beacon_struct *beacon_hdr;
136 struct ethhdr *e_hdr;
137 struct info_struct *my_info_struct;
138 int i,p_o,w_o,e_o,i_o;
140 my_info_struct=(struct info_struct *)info;
141 ++(my_info_struct->count);
144 p_o=((strncmp(my_info_struct->dev,"wlan",4)==0)?sizeof(struct linux_wlan_ng_prism_hdr):0);
145 w_o=((strncmp(my_info_struct->dev,"wlan",4)==0)?sizeof(struct ieee802_11_hdr):0);
146 e_o=sizeof(struct ethhdr);
147 i_o=sizeof(struct iphdr);
151 printf("---> package %d ---- %s",my_info_struct->count,
152 ctime((const time_t*)&(pcap_header->ts.tv_sec)));
155 printf("pcap header: ");
156 printf("capture_length(dec): %d\t",pcap_header->caplen);
157 printf("off_wire_length(dec): %d\n",pcap_header->len);
160 /* prism wlan ng headers */
161 if((my_info_struct->mmode-0x30==1) &
162 (strncmp(my_info_struct->dev,"wlan",4)==0)) {
163 printf("prism header: (%d bytes)\n",p_o);
164 prism_hdr=(struct linux_wlan_ng_prism_hdr *)package;
165 printf("| message code/length: %d/%d |\t",prism_hdr->msgcode,
167 printf("device: %s |\n",prism_hdr->devname);
168 /* ieee802.11 header */
170 /* we need smaller w_hdr for non distributed frames */
171 if((w_hdr->frame_ctl & (1<<8)) & (w_hdr->frame_ctl & (1<<9))) {
172 printf("=> distributed packet !!!!11\n");
173 } else w_o-=(sizeof(struct snaphdr)-sizeof(unsigned short));
175 printf("ieee802.11 header: (%d bytes)\n",w_o);
176 w_hdr=(struct ieee802_11_hdr *)(package+p_o);
180 printf("%s%d%s",(i==0?"|":""),
181 (((w_hdr->frame_ctl) & (1<<i))>0?1:0),
183 printf(" | v | t | s-t |t|f|m|r|p|m|w|o|\n");
186 if(!(w_hdr->frame_ctl & 0x0c)) {
187 if((w_hdr->frame_ctl & IEEE802_11_STYPE_ASSOC_REQ)>0)
188 strcpy(tmp_buf,"association request");
189 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_ASSOC_RESP)>0)
190 strcpy(tmp_buf,"association response");
191 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_REASSOC_REQ)>0)
192 strcpy(tmp_buf,"reassociation request");
193 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_REASSOC_RESP)>0)
194 strcpy(tmp_buf,"reassociation response");
195 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_PROBE_REQ)>0)
196 strcpy(tmp_buf,"probe request");
197 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_PROBE_RESP)>0)
198 strcpy(tmp_buf,"probe response");
199 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_BEACON)==IEEE802_11_STYPE_BEACON) {
200 beacon_hdr=(struct beacon_struct *)(package+p_o+w_o);
201 beacon_hdr->ssid_s.elementid==0?strcpy(tmp_buf1,"essid = ")
202 :strcpy(tmp_buf1,"ibssid = ");
203 strncpy(tmp_buf2,beacon_hdr->ssid_s.ssid,
204 beacon_hdr->ssid_s.length);
205 tmp_buf2[beacon_hdr->ssid_s.length]='\0';
206 strcpy(tmp_buf,"beacon");
207 add_ssid_2_list(tmp_buf2,my_info_struct->ssid_list);
209 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_ATIM)>0)
210 strcpy(tmp_buf,"announcement traffic indication message");
211 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_DISASSOC)>0)
212 strcpy(tmp_buf,"disassociation");
213 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_AUTH)>0)
214 strcpy(tmp_buf,"authentification");
215 else if((w_hdr->frame_ctl & IEEE802_11_STYPE_DEAUTH)>0)
216 strcpy(tmp_buf,"deauthentification");
217 else strcpy(tmp_buf,"impossible situation \%) - go mail the author.");
219 else strcpy(tmp_buf,"control & data frame type not supported yet");
220 /* print out frame type */
221 printf("=> %s\n",tmp_buf);
222 printf(" %s%s\n",tmp_buf1,tmp_buf2);
223 printf("duration/id: 0x%x\n",w_hdr->duration_id);
224 printf("version check ... %s\n",
225 ((w_hdr->frame_ctl & IEEE802_11_FCTL_VERS)==0x00)?
230 if((strncmp(my_info_struct->dev,"eth",3)==0) |
231 ((w_hdr->frame_ctl & IEEE802_11_FTYPE_DATA)==IEEE802_11_FTYPE_DATA)) {
233 if((strncmp(my_info_struct->dev,"eth",3)==0)) {
234 printf("ethernet: (%d bytes)\n",e_o);
235 e_hdr=(struct ethhdr *)(package+p_o+w_o);
238 printf("%x ",ntohs(e_hdr->h_proto));
239 printf("dest_addr = ");
240 for(i=0;i<ETH_ALEN;i++)
241 printf("%x%s",*(e_hdr->h_dest+i),((i==ETH_ALEN-1)?" ":":"));
242 printf(" src_addr = ");
243 for(i=0;i<ETH_ALEN;i++) printf("%x%s",*(e_hdr->h_source+i),
244 ((i==ETH_ALEN-1)?"\n":":"));
245 if((ntohs(e_hdr->h_proto)==ETH_P_IP))
246 parse_ip(package+p_o+w_o+e_o);
249 snap_hdr=(struct snaphdr *)(package+p_o+w_o);
250 if((snap_hdr->snap[0]==0xaa) &
251 (snap_hdr->snap[1]==0xaa) &
252 (snap_hdr->snap[2]==0x03) &
253 (snap_hdr->snap[3]==0x00) &
254 (snap_hdr->snap[4]==0x00) &
255 (snap_hdr->snap[5]==0x00)) {
256 printf("- no encryption!\n");
257 if(snap_hdr->proto==ntohs(ETH_P_IP)) {
258 e_o=sizeof(struct snaphdr);
259 parse_ip(snap_hdr+e_o);
264 printf("- crypted packet!\n");
265 /* print crypted snap - write into file */
266 printf("snap: (iv(3) + index(1) + crypted snap(6)) ");
268 printf("%x ",*(snap_hdr->snap+i));
269 crypted_snap[i]=*(snap_hdr->snap+i);
272 crypted_snap[4]^=0xaa;
273 crypted_snap[5]^=0xaa;
274 crypted_snap[6]^=0x03;
275 crypted_snap[7]^=0x00;
276 crypted_snap[8]^=0x00;
277 crypted_snap[9]^=0x00;
281 crypted_snap[10]='\0';
282 crypted_snap[11]='\n';
285 printf("debug: saved to file\n");
286 dprintf(file_fd,IVLINE,IVL_ARGS);
294 printf("all dump: (hex)\n");
295 for(i=p_o+w_o;i<pcap_header->caplen;i++)
296 printf("%x ",*(package+i));
300 printf("all dump: (char)\n");
301 for(i=p_o+w_o;i<pcap_header->caplen;i++)
302 printf("%c ",*(package+i));
307 int hop_channel(struct info_struct *info,int foo_fd) {
308 if((info->mmode-0x30==1) && (strncmp(info->dev,"wlan",4)==0)) {
310 struct iwreq my_iwreq;
312 if (info->channel>=C_MAX) info->channel=1;
314 memset(&my_iwreq,0,sizeof(my_iwreq));
315 strcpy(my_iwreq.ifr_name,info->dev);
317 my_iwreq.u.freq.m=info->channel;
318 if((ioctl(foo_fd,SIOCSIWFREQ,&my_iwreq))==-1) {
319 printf("unable to hop channels\n");
328 int parse_ip(char *ip_o) {
329 struct iphdr *ip_hdr;
332 printf("ip protocol:\n");
333 ip_hdr=(struct iphdr *)ip_o;
334 printf("version = %x ",ntohs(ip_hdr->version));
335 printf("header_length = %x \n",ntohs(ip_hdr->ihl));
336 printf("service = %x ",ntohs(ip_hdr->tos));
337 printf("total_length(dec.) = %d \n",ntohs(ip_hdr->tot_len));
338 printf("source_ip: ");
341 (ip_hdr->saddr&(0xff<<(8*i)))>>(8*i),
344 printf("destination_ip: ");
347 (ip_hdr->daddr&(0xff<<(8*i)))>>(8*i),
350 printf("ip_id = %x ",ntohs(ip_hdr->id));
351 printf("ip_offset = %x \n",ntohs(ip_hdr->frag_off));
352 printf("time2live = %x ip_proto = %x\n",ntohs(ip_hdr->ttl),
353 ntohs(ip_hdr->protocol));
354 // printf("chksum: %x\n",ntohs(ip_hdr->ip_sum));