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#!/usr/bin/env python
# Parses the nl80211.h interface and generate appropriate enums and fields
# (value_string) for packet-netlink-nl80211.c
#
# Copyright (c) 2017, Peter Wu <peter@lekensteyn.nl>
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 1998 Gerald Combs
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#
# To update the dissector source file, run this from the source directory:
#
# python tools/generate-nl80211-fields.py --update
#
import argparse
import re
import requests
import sys
# Begin of comment, followed by the actual array definition
HEADER = "/* Definitions from linux/nl80211.h {{{ */\n"
FOOTER = "/* }}} */\n"
# Enums to extract from the header file
EXPORT_ENUMS = ("nl80211_commands", "nl80211_attrs")
# File to be patched
SOURCE_FILE = "epan/dissectors/packet-netlink-nl80211.c"
# URL where the latest version can be found
URL = "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/include/uapi/linux/nl80211.h"
def make_enum(name, values, indent):
code = 'enum ws_%s {\n' % name
for value in values:
code += '%sWS_%s,\n' % (indent, value)
code += '};\n'
return code
def make_value_string(name, values, indent):
code = 'static const value_string ws_%s_vals[] = {\n' % name
align = 40
for value in values:
code += indent + ('{ WS_%s,' % value).ljust(align - 1) + ' '
code += '"%s" },\n' % value
code += '%s{ 0, NULL }\n' % indent
code += '};\n'
code += 'static value_string_ext ws_%s_vals_ext =' % name
code += ' VALUE_STRING_EXT_INIT(ws_%s_vals);\n' % name
return code
class EnumStore(object):
def __init__(self, name):
self.name = name
self.values = []
self.active = True
def update(self, line):
if not self.active:
return
# Skip comments and remove trailing comma
line = re.sub(r'\s*/\*.*?\*/\s*', '', line).rstrip(",")
if not line:
return
# Try to match a name. Allow aliases only for the previous item.
m = re.match(r'^(?P<name>\w+)(?: *= *(?P<alias_of>\w+))?$', line)
assert m, "Failed to find match in %r" % line
name, alias_of = m.groups()
if alias_of:
# Alias must match previous item, skip it otherwise.
assert alias_of == self.values[-1]
elif name.startswith("__"):
# Skip after hitting "__NL80211_CMD_AFTER_LAST"
self.active = False
else:
self.values.append(name)
def finish(self):
assert not self.active
assert self.values
return self.name, self.values
def parse_header(f):
enum_store = None
enums = []
for line in f:
line = line.strip()
if line.startswith("enum "):
assert not enum_store
enum_keyword, enum_name, trailer = line.split()
assert trailer == "{"
if enum_name in EXPORT_ENUMS:
enum_store = EnumStore(enum_name)
elif enum_store:
if line == "};":
enums.append(enum_store.finish())
enum_store = None
elif line:
enum_store.update(line)
return enums
def parse_source():
"""
Reads the source file and tries to split it in the parts before, inside and
after the block.
"""
begin, block, end = '', '', ''
# Stages: 1 (before block), 2 (in block, skip), 3 (after block)
stage = 1
with open(SOURCE_FILE) as f:
for line in f:
if line == FOOTER and stage == 2:
stage = 3 # End of block
if stage == 1:
begin += line
if line == HEADER:
stage = 2 # Begin of block
elif stage == 2:
block += line
elif stage == 3:
end += line
if stage != 3:
raise RuntimeError("Could not parse file (in stage %d)" % stage)
return begin, block, end
parser = argparse.ArgumentParser()
parser.add_argument("--update", action="store_true",
help="Update %s as needed instead of writing to stdout" % SOURCE_FILE)
parser.add_argument("--indent", default=" " * 4,
help="indentation (use \\t for tabs, default 4 spaces)")
parser.add_argument("header_file", nargs="?", default=URL,
help="nl80211.h header file (use - for stdin or a HTTP(S) URL, "
"default %(default)s)")
def main():
args = parser.parse_args()
indent = args.indent.replace("\\t", "\t")
if any(args.header_file.startswith(proto) for proto in ('http:', 'https')):
r = requests.get(args.header_file)
r.raise_for_status()
enums = parse_header(r.text.splitlines())
elif args.header_file == "-":
enums = parse_header(sys.stdin)
else:
with open(args.header_file) as f:
enums = parse_header(f)
assert len(enums) == len(EXPORT_ENUMS), \
"Could not parse data, found %d/%d results" % \
(len(enums), len(EXPORT_ENUMS))
code_enums, code_vals = '', ''
for enum_name, enum_values in enums:
code_enums += make_enum(enum_name, enum_values, indent) + '\n'
code_vals += make_value_string(enum_name, enum_values, indent) + '\n'
code = code_enums + code_vals
code = code.rstrip("\n") + "\n"
if args.update:
begin, block, end = parse_source()
if block == code:
print("File is up-to-date")
else:
with open(SOURCE_FILE, "w") as f:
f.write(begin)
f.write(code)
f.write(end)
print("Updated %s" % SOURCE_FILE)
else:
print(code)
if __name__ == '__main__':
main()
#
# Editor modelines - https://www.wireshark.org/tools/modelines.html
#
# Local variables:
# c-basic-offset: 4
# tab-width: 8
# indent-tabs-mode: nil
# End:
#
# vi: set shiftwidth=4 tabstop=8 expandtab:
# :indentSize=4:tabSize=8:noTabs=true:
#
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