openwrt/package/ppp/utils/pfc.c

   1 /*
   2  * Taken from fli4l 3.0
   3  * Make sure you compile it against the same libpcap version used in OpenWrt
   4  */
   5
   6 #include <stdlib.h>
   7 #include <sys/types.h>
   8 #include <sys/time.h>
   9 #include <string.h>
  10
  11 #include <linux/types.h>
  12 #include <linux/ppp_defs.h>
  13
  14 #include <pcap.h>
  15 #include <pcap-bpf.h>
  16
  17 int main (int argc, char ** argv)
  18 {
  19     pcap_t  *pc; /* Fake struct pcap so we can compile expr */
  20     struct  bpf_program filter; /* Filter program for link-active pkts */
  21     u_int32_t netmask=0;
  22
  23     int dflag = 3;
  24     if (argc == 4)
  25     {
  26         if (!strcmp (argv[1], "-d"))
  27         {
  28             dflag = atoi (argv[2]);
  29             argv += 2;
  30             argc -=2;
  31         }
  32     }
  33     if (argc != 2)
  34     {
  35         printf ("usage; %s [ -d <debug_level> ] expression\n", argv[0]);
  36         return 1;
  37     }
  38
  39     pc = pcap_open_dead(DLT_PPP_PPPD, PPP_HDRLEN);
  40     if (pcap_compile(pc, &filter, argv[1], 1, netmask) == 0)
  41     {
  42         printf ("#\n# Expression: %s\n#\n", argv[1]);
  43         bpf_dump (&filter, dflag);
  44         return 0;
  45     }
  46     else
  47     {
  48         printf("error in active-filter expression: %s\n", pcap_geterr(pc));
  49     }
  50     return 1;
  51 }