second day

[my-code/hdw-sniff.git] / hdw-sniff.c

diff --git a/hdw-sniff.c b/hdw-sniff.c
index 2757d6a..174e00f 100644 (file)
--- a/hdw-sniff.c
+++ b/hdw-sniff.c
@@ -6,12 +6,89 @@
 
 #include <stdio.h>
 #include <pcap.h>
+
+/* IEEE 802.3 stuff -- i will concentrate on .11 stuff before! */
+#include <netinet/if_ether.h>
+
+/* IEEE 802.11 stuff -- will become one include later ... */
+#include "ieee80211.h" /* from hunz's aeolus, short hostap_wlan.h */
+#include "ieee802_11.h" /* from pcmcia-cs */
+
 #include "hdw-sniff.h" /* my functions */
 
 int main(int argc, char *argv[]) {
-       
-       int count;
 
+       int i;
+       char pcap_error[PCAP_ERRBUF_SIZE];
+       pcap_t *pcap_handle;
+       const u_char *package;
+       struct pcap_pkthdr pcap_header;
+       struct ethhdr *e_hdr;
+       struct ieee802_11_hdr *w_hdr;
+       
        /* parse the arguments */
-       for(i=1;i<argc,++i) {
-                       
+       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! :)");
+}