/*
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* BPF program compilation tool
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*
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* Generates decimal output, similar to `tcpdump -ddd ...`.
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* Unlike tcpdump, will generate for any given link layer type.
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*
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* Written by Willem de Bruijn (willemb@google.com)
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* Copyright Google, Inc. 2013
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* Licensed under the GNU General Public License version 2 (GPLv2)
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*/
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#include <pcap.h>
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#include <stdio.h>
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int main(int argc, char **argv)
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{
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struct bpf_program program;
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struct bpf_insn *ins;
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int i, dlt = DLT_RAW;
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if (argc < 2 || argc > 3) {
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fprintf(stderr, "Usage: %s [link] '<program>'\n\n"
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" link is a pcap linklayer type:\n"
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" one of EN10MB, RAW, SLIP, ...\n\n"
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"Examples: %s RAW 'tcp and greater 100'\n"
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" %s EN10MB 'ip proto 47'\n'",
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argv[0], argv[0], argv[0]);
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return 1;
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}
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if (argc == 3) {
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dlt = pcap_datalink_name_to_val(argv[1]);
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if (dlt == -1) {
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fprintf(stderr, "Unknown datalinktype: %s\n", argv[1]);
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return 1;
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}
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}
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if (pcap_compile_nopcap(65535, dlt, &program, argv[argc - 1], 1,
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PCAP_NETMASK_UNKNOWN)) {
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fprintf(stderr, "Compilation error\n");
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return 1;
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}
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printf("%d,", program.bf_len);
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ins = program.bf_insns;
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for (i = 0; i < program.bf_len-1; ++ins, ++i)
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printf("%u %u %u %u,", ins->code, ins->jt, ins->jf, ins->k);
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printf("%u %u %u %u\n", ins->code, ins->jt, ins->jf, ins->k);
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pcap_freecode(&program);
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return 0;
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}
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