precompile ppp active filter (reduces libpcap overhead to only a few k), enable by...
[openwrt/svn-archive/archive.git] / 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 }