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wireshark/tools/generate-nl80211-fields.py

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#!/usr/bin/env python3
# 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>
# Copyright (c) 2018, Mikael Kanstrup <mikael.kanstrup@sony.com>
#
# Wireshark - Network traffic analyzer
# By Gerald Combs <gerald@wireshark.org>
# Copyright 1998 Gerald Combs
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
#
# 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 = {
# 'enum_name': ('field_name', field_type', 'field_blurb')
'nl80211_commands': ('Command', 'FT_UINT8', '"Generic Netlink Command"'),
'nl80211_attrs': (None, None, None),
'nl80211_iftype': (None, None, None),
'nl80211_sta_flags': (None, None, None),
'nl80211_sta_p2p_ps_status': ('Attribute Value', 'FT_UINT8', None),
'nl80211_he_gi': (None, None, None),
'nl80211_he_ru_alloc': (None, None, None),
'nl80211_rate_info': (None, None, None),
'nl80211_sta_bss_param': (None, None, None),
'nl80211_sta_info': (None, None, None),
'nl80211_tid_stats': (None, None, None),
'nl80211_txq_stats': (None, None, None),
'nl80211_mpath_flags': (None, None, None),
'nl80211_mpath_info': (None, None, None),
'nl80211_band_iftype_attr': (None, None, None),
'nl80211_band_attr': (None, None, None),
'nl80211_wmm_rule': (None, None, None),
'nl80211_frequency_attr': (None, None, None),
'nl80211_bitrate_attr': (None, None, None),
'nl80211_reg_initiator': ('Attribute Value', 'FT_UINT8', None),
'nl80211_reg_type': ('Attribute Value', 'FT_UINT8', None),
'nl80211_reg_rule_attr': (None, None, None),
'nl80211_sched_scan_match_attr': (None, None, None),
'nl80211_reg_rule_flags': (None, None, None),
'nl80211_dfs_regions': ('Attribute Value', 'FT_UINT8', None),
'nl80211_user_reg_hint_type': ('Attribute Value', 'FT_UINT32', None),
'nl80211_survey_info': (None, None, None),
'nl80211_mntr_flags': (None, None, None),
'nl80211_mesh_power_mode': ('Attribute Value', 'FT_UINT32', None),
'nl80211_meshconf_params': (None, None, None),
'nl80211_mesh_setup_params': (None, None, None),
'nl80211_txq_attr': (None, None, None),
'nl80211_ac': (None, None, None),
'nl80211_channel_type': ('Attribute Value', 'FT_UINT32', None),
'nl80211_key_mode': (None, None, None),
'nl80211_chan_width': ('Attribute Value', 'FT_UINT32', None),
'nl80211_bss_scan_width': ('Attribute Value', 'FT_UINT32', None),
'nl80211_bss': (None, None, None),
'nl80211_bss_status': ('Attribute Value', 'FT_UINT32', None),
'nl80211_auth_type': ('Attribute Value', 'FT_UINT32', None),
'nl80211_key_type': ('Attribute Value', 'FT_UINT32', None),
'nl80211_mfp': ('Attribute Value', 'FT_UINT32', None),
'nl80211_wpa_versions': (None, None, None),
'nl80211_key_default_types': (None, None, None),
'nl80211_key_attributes': (None, None, None),
'nl80211_tx_rate_attributes': (None, None, None),
'nl80211_txrate_gi': (None, None, None),
'nl80211_band': (None, None, None),
'nl80211_ps_state': ('Attribute Value', 'FT_UINT32', None),
'nl80211_attr_cqm': (None, None, None),
'nl80211_cqm_rssi_threshold_event': (None, None, None),
'nl80211_tx_power_setting': ('Attribute Value', 'FT_UINT32', None),
'nl80211_packet_pattern_attr': (None, None, None),
'nl80211_wowlan_triggers': (None, None, None),
'nl80211_wowlan_tcp_attrs': (None, None, None),
'nl80211_attr_coalesce_rule': (None, None, None),
'nl80211_coalesce_condition': (None, None, None),
'nl80211_iface_limit_attrs': (None, None, None),
'nl80211_if_combination_attrs': (None, None, None),
'nl80211_plink_state': ('Attribute Value', 'FT_UINT8', None),
'plink_actions': ('Attribute Value', 'FT_UINT8', None),
'nl80211_rekey_data': (None, None, None),
'nl80211_hidden_ssid': (None, None, None),
'nl80211_sta_wme_attr': (None, None, None),
'nl80211_pmksa_candidate_attr': (None, None, None),
'nl80211_tdls_operation': ('Attribute Value', 'FT_UINT8', None),
#Reserved for future use 'nl80211_ap_sme_features': (None, None, None),
'nl80211_feature_flags': (None, None, None),
'nl80211_ext_feature_index': (None, None, None),
'nl80211_probe_resp_offload_support_attr': (None, None, None),
'nl80211_connect_failed_reason': ('Attribute Value', 'FT_UINT32', None),
'nl80211_timeout_reason': ('Attribute Value', 'FT_UINT32', None),
'nl80211_scan_flags': (None, None, None),
'nl80211_acl_policy': ('Attribute Value', 'FT_UINT32', None),
'nl80211_smps_mode': ('Attribute Value', 'FT_UINT8', None),
'nl80211_radar_event': ('Attribute Value', 'FT_UINT32', None),
'nl80211_dfs_state': (None, None, None),
'nl80211_protocol_features': (None, None, None),
'nl80211_crit_proto_id': ('Attribute Value', 'FT_UINT16', None),
'nl80211_rxmgmt_flags': (None, None, None),
'nl80211_tdls_peer_capability': (None, None, None),
'nl80211_sched_scan_plan': (None, None, None),
'nl80211_bss_select_attr': (None, None, None),
'nl80211_nan_function_type': (None, None, None),
'nl80211_nan_publish_type': (None, None, None),
'nl80211_nan_func_term_reason': (None, None, None),
'nl80211_nan_func_attributes': (None, None, None),
'nl80211_nan_srf_attributes': (None, None, None),
'nl80211_nan_match_attributes': (None, None, None),
'nl80211_external_auth_action': ('Attribute Value', 'FT_UINT32', None),
'nl80211_ftm_responder_attributes': (None, None, None),
'nl80211_ftm_responder_stats': (None, None, None),
'nl80211_preamble': (None, None, None),
'nl80211_peer_measurement_type': (None, None, None),
'nl80211_peer_measurement_status': (None, None, None),
'nl80211_peer_measurement_req': (None, None, None),
'nl80211_peer_measurement_resp': (None, None, None),
'nl80211_peer_measurement_peer_attrs': (None, None, None),
'nl80211_peer_measurement_attrs': (None, None, None),
'nl80211_peer_measurement_ftm_capa': (None, None, None),
'nl80211_peer_measurement_ftm_req': (None, None, None),
'nl80211_peer_measurement_ftm_failure_reasons': (None, None, None),
'nl80211_peer_measurement_ftm_resp': (None, None, None),
'nl80211_obss_pd_attributes': (None, None, None),
}
# 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, expressions, indent):
code = 'enum ws_%s {\n' % name
for value, expression in zip(values, expressions):
if expression and 'NL80211' in expression:
expression = 'WS_%s' % expression
if expression:
code += '%sWS_%s = %s,\n' % (indent, value, expression)
else:
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
def remove_prefix(prefix, text):
if text.startswith(prefix):
return text[len(prefix):]
return text
def make_hf_defs(name, indent):
code = 'static gint hf_%s = -1;' % name
return code
def make_hf(name, indent):
(field_name, field_type, field_blurb) = EXPORT_ENUMS.get(name)
field_abbrev = name
# Fill in default values
if not field_name:
field_name = 'Attribute Type'
if not field_type:
field_type = 'FT_UINT16'
if not field_blurb:
field_blurb = 'NULL'
# Special treatment of already existing field names
rename_fields = {
'nl80211_attrs': 'nl80211_attr_type',
'nl80211_commands': 'nl80211_cmd'
}
if rename_fields.get(name):
field_abbrev = rename_fields[name]
field_abbrev = remove_prefix('nl80211_', field_abbrev)
code = indent + indent + '{ &hf_%s,\n' % name
code += indent*3 + '{ "%s", "nl80211.%s",\n' % (field_name, field_abbrev)
code += indent*3 + ' %s, BASE_DEC | BASE_EXT_STRING,\n' % (field_type)
code += indent*3 + ' VALS_EXT_PTR(&ws_%s_vals_ext), 0x00,\n' % (name)
code += indent*3 + ' %s, HFILL },\n' % (field_blurb)
code += indent + indent + '},'
return code
def make_ett_defs(name, indent):
code = 'static gint ett_%s = -1;' % name
return code
def make_ett(name, indent):
code = indent + indent + '&ett_%s,' % name
return code
class EnumStore(object):
__RE_ENUM_VALUE = re.compile(
r'\s+?(?P<value>\w+)(?:\ /\*.*?\*\/)?(?:\s*=\s*(?P<expression>.*?))?(?:\s*,|$)',
re.MULTILINE | re.DOTALL)
def __init__(self, name, values):
self.name = name
self.values = []
self.expressions = []
self.active = True
self.parse_values(values)
def parse_values(self, values):
for m in self.__RE_ENUM_VALUE.finditer(values):
value, expression = m.groups()
if value.startswith('NUM_'):
break
if value.endswith('_AFTER_LAST'):
break
if value.endswith('_LAST'):
break
if value.startswith('__') and value.endswith('_NUM'):
break
if expression and expression in self.values:
# Skip aliases
continue
self.values.append(value)
self.expressions.append(expression)
def finish(self):
return self.name, self.values, self.expressions
RE_ENUM = re.compile(
r'enum\s+?(?P<enum>\w+)\s+?\{(?P<values>.*?)\}\;',
re.MULTILINE | re.DOTALL)
RE_COMMENT = re.compile(r'/\*.*?\*/', re.MULTILINE | re.DOTALL)
def parse_header(content):
# Strip comments
content = re.sub(RE_COMMENT, '', content)
enums = []
for m in RE_ENUM.finditer(content):
enum = m.group('enum')
values = m.group('values')
if enum in EXPORT_ENUMS:
enums.append(EnumStore(enum, values).finish())
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 = '', '', ''
parts = []
# 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
elif stage == 2:
block += line
elif stage == 3:
end += line
if line == HEADER and stage == 1:
stage = 2 # Begin of block
if line == HEADER and stage == 3:
stage = 2 # Begin of next code block
parts.append((begin, block, end))
begin, block, end = '', '', ''
parts.append((begin, block, end))
if stage != 3 or len(parts) != 3:
raise RuntimeError("Could not parse file (in stage %d) (parts %d)" % (stage, len(parts)))
return parts
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)
elif args.header_file == "-":
enums = parse_header(sys.stdin.read())
else:
with open(args.header_file) as f:
enums = parse_header(f.read())
assert len(enums) == len(EXPORT_ENUMS), \
"Could not parse data, found %d/%d results" % \
(len(enums), len(EXPORT_ENUMS))
code_enums, code_vals, code_hf_defs, code_ett_defs, code_hf, code_ett = '', '', '', '', '', ''
for enum_name, enum_values, expressions in enums:
code_enums += make_enum(enum_name, enum_values, expressions, indent) + '\n'
code_vals += make_value_string(enum_name, enum_values, indent) + '\n'
code_hf_defs += make_hf_defs(enum_name, indent) + '\n'
code_ett_defs += make_ett_defs(enum_name, indent) + '\n'
code_hf += make_hf(enum_name, indent) + '\n'
code_ett += make_ett(enum_name, indent) + '\n'
code_top = code_enums + code_vals + code_hf_defs + '\n' + code_ett_defs
code_top = code_top.rstrip("\n") + "\n"
code = [code_top, code_hf, code_ett]
update = False
if args.update:
parts = parse_source()
# Check if file needs update
for (begin, old_code, end), new_code in zip(parts, code):
if old_code != new_code:
update = True
break
if not update:
print("File is up-to-date")
return
# Update file
with open(SOURCE_FILE, "w") as f:
for (begin, old_code, end), new_code in zip(parts, code):
f.write(begin)
f.write(new_code)
f.write(end)
print("Updated %s" % SOURCE_FILE)
else:
for new_code in code:
print(new_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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