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