2 * hdw-sniff, sniffer using pcap lib
4 * author: hackbard@hackdaworld.dyndns.org
10 /* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */
11 #include <netinet/if_ether.h>
12 #include <netinet/ip.h> /* ip */
13 #include <netinet/in.h> /* in_addr */
15 /* IEEE 802.11 stuff -- will become one include later ... */
16 #include "ieee80211.h" /* from hunz's aeolus, short hostap_wlan.h */
17 #include "ieee802_11.h" /* from pcmcia-cs */
19 #include "hdw-sniff.h" /* my functions */
21 #define MAX_PACKAGES 3
23 int main(int argc, char *argv[]) {
26 char pcap_error[PCAP_ERRBUF_SIZE];
28 const u_char *package;
29 struct pcap_pkthdr pcap_header;
32 struct ieee802_11_hdr *w_hdr;
34 /* parse the arguments */
36 printf("usage: %s <interface> <logfile>\n",argv[0]);
40 printf("no logfile specified, writing to stdout ...\n");
43 /* start pcap session */
44 pcap_handle=pcap_open_live(argv[1],BUFSIZ,1,-1,pcap_error);
45 if(pcap_handle==NULL) {
46 printf("%s: %s\n",argv[0],pcap_error);
50 /* grab a package until user breaks */
52 while (count<MAX_PACKAGES) {
55 if((package=pcap_next(pcap_handle,&pcap_header))!=NULL) {
56 printf("---> package %d ---- %s",count,
57 ctime((const time_t*)&pcap_header.ts.tv_sec));
58 printf("pcap header: ");
59 printf("capture length=%d ",pcap_header.caplen);
60 printf("length(off wire)=%d\n",pcap_header.len);
63 /* is ieee802.11 ? -- we assume yes :) */
69 e_hdr=(struct ethhdr *)package;
72 printf("%x ",ntohs(e_hdr->h_proto));
73 printf("dest_addr = ");
74 for(i=0;i<ETH_ALEN;i++)
75 printf("%x%s",*(e_hdr->h_dest+i),((i==ETH_ALEN-1)?" ":":"));
76 printf(" src_addr = ");
77 for(i=0;i<ETH_ALEN;i++)
78 printf("%x%s",*(e_hdr->h_source+i),((i==ETH_ALEN-1)?"\n":":"));
80 if(ntohs(e_hdr->h_proto)==ETH_P_IP) {
81 printf("ip protocol: ");
82 ip_hdr=(struct ip *)(package+sizeof(struct ethhdr));
83 printf("version = %x ",ntohs(ip_hdr->ip_v));
84 printf("header_length = %x \n",ntohs(ip_hdr->ip_hl));
85 printf("service = %x ",ntohs(ip_hdr->ip_tos));
86 printf("total_length(dec.) = %d \n",ntohs(ip_hdr->ip_len));
87 printf("ip_addresses: source = ");
88 printf("%s\tdestination = %s\n",inet_ntoa(ip_hdr->ip_src),
89 inet_ntoa(ip_hdr->ip_dst));
93 printf("all_hex_dump:\n");
94 for(i=sizeof(struct ethhdr);i<pcap_header.caplen;i++)
95 printf("%x ",*(package+i));
99 printf("wake up early! :)\n");