treewide: fix replace nbd@openwrt.org with nbd@nbd.name
[openwrt.org/openwrt.git] / package / network / services / ead / src / pfc.c
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/*
 * Small pcap precompiler
 * Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
 
#include <sys/types.h>
#include <sys/time.h>
#include <string.h>
#include <stdlib.h>
#include <pcap.h>
 
int main (int argc, char ** argv)
{
        struct bpf_program filter;
        pcap_t *pc;
        int i;
 
        if (argc != 2)
        {
                printf ("Usage: %s <expression>\n", argv[0]);
                return 1;
        }
 
        pc = pcap_open_dead(DLT_EN10MB, 1500);
        if (pcap_compile(pc, &filter, argv[1], 1, 0) != 0) {
                printf("error in active-filter expression: %s\n", pcap_geterr(pc));
                return 1;
        }
 
        printf("/* precompiled expression: %s */\n\n"
                "static struct bpf_insn pktfilter_insns[] = {\n",
                argv[1]);
 
        for (i = 0; i < filter.bf_len; i++) {
                struct bpf_insn *in = &filter.bf_insns[i];
                printf("\t{ .code = 0x%04x, .jt = 0x%02x, .jf = 0x%02x, .k = 0x%08x },\n", in->code, in->jt, in->jf, in->k);
        }
        printf("};\n\n"
                "static struct bpf_program pktfilter = {\n"
                "\t.bf_len = %d,\n"
                "\t.bf_insns = pktfilter_insns,\n"
                "};\n", filter.bf_len);
        return 0;
 
}
 
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