+ if(argc<2) {
+ printf("usage: %s <interface> <logfile>\n",argv[0]);
+ return 0;
+ }
+ if(argc!=3) {
+ printf("no logfile specified, writing to stdout ...\n");
+ }
+
+ /* start pcap session */
+ pcap_handle=pcap_open_live(argv[1],BUFSIZ,1,-1,pcap_error);
+ if(pcap_handle==NULL) {
+ printf("%s: %s\n",argv[0],pcap_error);
+ return 1;
+ }
+
+ /* grab a package until user breaks */
+ while (1) {
+ printf("\n");
+
+ printf("----| new package |----| hdw - sniff |----\n");
+ if((package=pcap_next(pcap_handle,&pcap_header))!=NULL) {
+ printf("package received at: %s",
+ ctime((const time_t*)&pcap_header.ts.tv_sec));
+ printf("pcap header: ");
+ printf("capture length=%d ",pcap_header.caplen);
+ printf("length(off wire)=%d\n",pcap_header.len);
+ }
+
+ /* 802.11 or 802.3 -- not quite sure about 'D' & '\0' */
+ if(*package=='D') {
+ printf("ieee802.11: ");
+ }
+ else if(*package=='\0') {
+ printf("ethernet: ");
+ /* reading ethernet header */
+ e_hdr=(struct ethhdr *)package;
+ /* what types ? */
+ printf("types = ");
+ // for(i=0;i<2;i++)
+ printf("%x %x\n",
+ /* i==0?"0x":" ", */
+ *(e_hdr->h_proto)
+ /* i==1?"\n":"" */
+ );
+ printf("dest_addr = ");
+ for(i=0;i<ETH_ALEN;i++)
+ printf("%x%s",*(e_hdr->h_dest+i),((i==ETH_ALEN-1)?" ":":"));
+ printf(" src_addr = ");
+ for(i=0;i<ETH_ALEN;i++)
+ printf("%x%s",*(e_hdr->h_source+i),((i==ETH_ALEN-1)?"\n":":"));
+ printf("rest:\n");
+ for(i=sizeof(struct ethhdr);i<pcap_header.caplen;i++)
+ printf("%x ",*(package+i));
+ printf("\n");
+ }
+ else {
+ printf("unknown: ");
+ /* print the whole package in hex */
+ for(i=0;i<=pcap_header.caplen;i++) printf("%x ",*(package+i));
+ printf("\n");
+ printf("%c <- identifier for unknown!\n",*package);
+ }
+ }
+ printf("just beacon frames, ha? - wake up early! :)");
+}