1/*
2 * Minimal BPF assembler
3 *
4 * Instead of libpcap high-level filter expressions, it can be quite
5 * useful to define filters in low-level BPF assembler (that is kept
6 * close to Steven McCanne and Van Jacobson's original BPF paper).
7 * In particular for BPF JIT implementors, JIT security auditors, or
8 * just for defining BPF expressions that contain extensions which are
9 * not supported by compilers.
10 *
11 * How to get into it:
12 *
13 * 1) read Documentation/networking/filter.txt
14 * 2) Run `bpf_asm [-c] <filter-prog file>` to translate into binary
15 *    blob that is loadable with xt_bpf, cls_bpf et al. Note: -c will
16 *    pretty print a C-like construct.
17 *
18 * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
19 * Licensed under the GNU General Public License, version 2.0 (GPLv2)
20 */
21
22#include <stdbool.h>
23#include <stdio.h>
24#include <string.h>
25
26extern void bpf_asm_compile(FILE *fp, bool cstyle);
27
28int main(int argc, char **argv)
29{
30	FILE *fp = stdin;
31	bool cstyle = false;
32	int i;
33
34	for (i = 1; i < argc; i++) {
35		if (!strncmp("-c", argv[i], 2)) {
36			cstyle = true;
37			continue;
38		}
39
40		fp = fopen(argv[i], "r");
41		if (!fp) {
42			fp = stdin;
43			continue;
44		}
45
46		break;
47	}
48
49	bpf_asm_compile(fp, cstyle);
50
51	return 0;
52}
53