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'.
27 #include <sys/fsuid.h>
34 static const char *short_options
= "vhi:VdbHLg";
35 static const struct option long_options
[] = {
36 {"input", required_argument
, NULL
, 'i'},
37 {"verbose", no_argument
, NULL
, 'V'},
38 {"hla", no_argument
, NULL
, 'H'},
39 {"lla", no_argument
, NULL
, 'L'},
40 {"hla-debug", no_argument
, NULL
, 'g'},
41 {"bypass", no_argument
, NULL
, 'b'},
42 {"dump", no_argument
, NULL
, 'd'},
43 {"version", no_argument
, NULL
, 'v'},
44 {"help", no_argument
, NULL
, 'h'},
48 extern int compile_filter(char *file
, int verbose
, int bypass
);
49 extern int compile_hla_filter(char *file
, int verbose
, int debug
);
51 static void help(void)
53 printf("\nbpfc %s, a tiny BPF compiler\n", VERSION_STRING
);
54 puts("http://www.netsniff-ng.org\n\n"
55 "Usage: bpfc [options] || bpfc <program>\n"
57 " -i|--input <program/-> Berkeley Packet Filter file/stdin\n"
58 " -H|--hla Compile high-level BPF\n"
59 " -L|--lla Compile low-level BPF\n"
60 " -V|--verbose Be more verbose\n"
61 " -b|--bypass Bypass filter validation (e.g. for bug testing)\n"
62 " -g|--hla-debug Print BPF expressions to stdout\n"
63 " -d|--dump Dump supported instruction table\n"
64 " -v|--version Print version\n"
65 " -h|--help Print this help\n\n"
71 " bpfc -Li - (read from stdin)\n\n"
72 "Please report bugs to <bugs@netsniff-ng.org>\n"
73 "Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n"
74 "Swiss federal institute of technology (ETH Zurich)\n"
75 "License: GNU GPL version 2.0\n"
76 "This is free software: you are free to change and redistribute it.\n"
77 "There is NO WARRANTY, to the extent permitted by law.\n");
81 static void version(void)
83 printf("\nbpfc %s, a tiny BPF compiler\n", VERSION_STRING
);
84 puts("http://www.netsniff-ng.org\n\n"
85 "Please report bugs to <bugs@netsniff-ng.org>\n"
86 "Copyright (C) 2011-2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,\n"
87 "Swiss federal institute of technology (ETH Zurich)\n"
88 "License: GNU GPL version 2.0\n"
89 "This is free software: you are free to change and redistribute it.\n"
90 "There is NO WARRANTY, to the extent permitted by law.\n");
94 int main(int argc
, char **argv
)
96 int ret
, verbose
= 0, c
, opt_index
, bypass
= 0, hla
= 0, debug
= 0;
105 while ((c
= getopt_long(argc
, argv
, short_options
,
106 long_options
, &opt_index
)) != EOF
) {
133 file
= xstrdup(optarg
);
138 panic("Option -%c requires an argument!\n",
142 whine("Unknown option character "
143 "`0x%X\'!\n", optopt
);
151 file
= xstrdup(argv
[1]);
154 panic("No Berkeley Packet Filter program specified!\n");
157 ret
= compile_hla_filter(file
, verbose
, debug
);
161 slprintf(file_tmp
, sizeof(file_tmp
), ".%s", file
);
162 ret
= compile_filter(file_tmp
, verbose
, bypass
);
166 ret
= compile_filter(file
, verbose
, bypass
);