2 * netsniff-ng - the packet sniffing beast
3 * By Daniel Borkmann <daniel@netsniff-ng.org>
4 * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
5 * Swiss federal institute of technology (ETH Zurich)
6 * Subject to the GPL, version 2.
8 * This is a tiny Berkeley Packet Filter compiler that understands the
9 * Syntax / Semantic from the USENIX paper {"The BSD Packet Filter: A New
10 * Architecture for User-level Packet Capture", McCanne, Steven and
11 * Jacobson, Van, Lawrence Berkeley Laboratory}. With this, BPFs can be
12 * written the good old way and understood by the Linux kernel and *BSD
13 * kernels where Berkeley Packet Filters are used.
15 * The one small garden of a free gardener was all his need and due, not
16 * a garden swollen to a realm; his own hands to use, not the hands of
19 * -- The Lord of the Rings, Sam, Chapter 'The Tower of Cirith Ungol'.
30 static const char *short_options
= "vhi:V";
32 static struct option long_options
[] = {
33 {"input", required_argument
, 0, 'i'},
34 {"verbose", no_argument
, 0, 'V'},
35 {"version", no_argument
, 0, 'v'},
36 {"help", no_argument
, 0, 'h'},
40 extern int compile_filter(char *file
, int verbose
);
42 static void help(void)
44 printf("\nbpfc %s, a tiny BPF compiler\n", VERSION_STRING
);
45 printf("http://www.netsniff-ng.org\n\n");
46 printf("Usage: bpfc [options] || bpfc <program>\n");
48 printf(" -i|--input <program> Berkeley Packet Filter file\n");
49 printf(" -V|--verbose Be more verbose\n");
50 printf(" -v|--version Print version\n");
51 printf(" -h|--help Print this help\n");
53 printf("Examples:\n");
54 printf(" bpfc -i fubar.bpf\n\n");
55 printf("Please report bugs to <bugs@netsniff-ng.org>\n");
56 printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
57 printf("Swiss federal institute of technology (ETH Zurich)\n");
58 printf("License: GNU GPL version 2\n");
59 printf("This is free software: you are free to change and redistribute it.\n");
60 printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
64 static void version(void)
66 printf("\nbpfc %s, a tiny BPF compiler\n", VERSION_STRING
);
67 printf("http://www.netsniff-ng.org\n\n");
68 printf("Please report bugs to <bugs@netsniff-ng.org>\n");
69 printf("Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n");
70 printf("Swiss federal institute of technology (ETH Zurich)\n");
71 printf("License: GNU GPL version 2\n");
72 printf("This is free software: you are free to change and redistribute it.\n");
73 printf("There is NO WARRANTY, to the extent permitted by law.\n\n");
77 int main(int argc
, char **argv
)
79 int ret
, verbose
= 0, c
, opt_index
;
85 while (argc
> 2 && (c
= getopt_long(argc
, argv
, short_options
,
86 long_options
, &opt_index
)) != EOF
) {
98 file
= xstrdup(optarg
);
103 panic("Option -%c requires an argument!\n",
107 whine("Unknown option character "
108 "`0x%X\'!\n", optopt
);
116 file
= xstrdup(argv
[1]);
119 panic("No Berkeley Packet Filter program specified!\n");
120 ret
= compile_filter(file
, verbose
);