Re: capturing on both interfaces simultaneously

[abhinav narain <abhinavnarain10 () gmail com>]

Actually, I did better now ... but I don't know what should be done to call
the corresponding dispatch
If someone can give me a hint


  char  *device0="phy0";
  char  *device1="phy1";
  pcap0 = pcap_open_live(device0, BUFSIZ, 1, -1, errbuf);
  pcap1 = pcap_open_live(device1, BUFSIZ, 1, -1, errbuf);

for(;;)
   {

   /* If you include STDIN_FILENO, be sure to read from it when you get
      traffic from it, or select will return every time it is called,
      since there will still be traffic waiting there.
   */

   FD_ZERO(&fd_wait);
   //FD_SET(STDIN_FILENO, &fd_wait);
   FD_SET(pcap_fileno(pcap0), &fd_wait);
   FD_SET(pcap_fileno(pcap1), &fd_wait);

   st.tv_sec  = 1;
   st.tv_usec = 0;   /* 1000 = 1 second */

   t=select(FD_SETSIZE, &fd_wait, NULL, NULL, &st);
   printf("t is %d\n",t);
   switch(t)
     {
     case -1:      /* Something went really wrong */
       printf("Argh!\n\n");
       exit(1);

     case  0:      /* We timed out, no trafffic */
       printf( " Time out ! \n");
       break;

     default:      /* We got traffic */
       pcap_dispatch(pcap0,-1, (void *) packet_callback, NULL);
       pcap_dispatch(pcap1,-1, (void *) packet_callback2, NULL);
     }
   // Put your service routine here.. is called when select times out or
when a packet is processed
   }





On Sat, Dec 10, 2011 at 7:12 PM, abhinav narain
<abhinavnarain10 () gmail com>wrote:

> Two threads are too large on this.
>
> I was unable to find how to set the set of interfaces to be restricted to
> 2 (the ones i want) and call the same callback on return from dispatch.
>
> This code is not right, but I am clueless to proceed
>
> Any direction will be good.
> <code>
>   fd_set rfds;
>   char * device="phy0";
>   char * device1="phy1";
>   handle1 = pcap_open_live(device, BUFSIZ, 1, 0, errbuf);
>   handle2 = pcap_open_live(device1, BUFSIZ, 1, 0, errbuf);
>
>   fd = pcap_get_selectable_fd(handle1);
>   pcap_compile(handle1, &fcode, "type mgt subtype beacon", 1, 0);
>   pcap_setfilter(handle1, &fcode);
>
>   /*
>
>
>   fd = pcap_get_selectable_fd(handle2);
>
>
>   pcap_compile(handle2, &fcode, "type mgt subtype beacon", 1, 0);
>
>
>   pcap_setfilter(handle2, &fcode);
>
>
>   */
>
>   while (retval == 0) {
>     FD_ZERO(&rfds);
>     FD_SET(fd, &rfds);
>     tv.tv_sec = 1; /* timeout 1 sec */
>     tv.tv_usec = 0;
>     retval = select(fd + 1, &rfds, NULL, NULL, &tv);
>
>     if(pcap_dispatch(handle1,-1,callback1,(u_char *)NULL) < 0 ){
>       printf("error");
>     }
>     if(pcap_dispatch(handle2, -1,callback1,(u_char *)NULL) < 0 ){
>       printf("error");
>     }
>
>   }
>
> </code>
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