| 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 | } |
| 52 | |
