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52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
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/*
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* Taken from fli4l 3.0
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* Make sure you compile it against the same libpcap version used in OpenWrt
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <string.h>
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#include <linux/types.h>
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#include <linux/ppp_defs.h>
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#include <pcap.h>
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#include <pcap-bpf.h>
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int main (int argc, char ** argv)
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{
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pcap_t *pc; /* Fake struct pcap so we can compile expr */
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struct bpf_program filter; /* Filter program for link-active pkts */
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u_int32_t netmask=0;
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int dflag = 3;
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if (argc == 4)
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{
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if (!strcmp (argv[1], "-d"))
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{
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dflag = atoi (argv[2]);
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argv += 2;
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argc -=2;
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}
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}
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if (argc != 2)
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{
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printf ("usage; %s [ -d <debug_level> ] expression\n", argv[0]);
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return 1;
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}
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pc = pcap_open_dead(DLT_PPP_PPPD, PPP_HDRLEN);
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if (pcap_compile(pc, &filter, argv[1], 1, netmask) == 0)
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{
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printf ("#\n# Expression: %s\n#\n", argv[1]);
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bpf_dump (&filter, dflag);
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return 0;
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}
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else
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{
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printf("error in active-filter expression: %s\n", pcap_geterr(pc));
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}
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return 1;
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}
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