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mbedtls/scripts/config.pl

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#!/usr/bin/env perl
#
# Copyright (c) 2014-2016, ARM Limited, All Rights Reserved
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
# This file is provided under the Apache License 2.0, or the
# GNU General Public License v2.0 or later.
#
# **********
# Apache License 2.0:
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# **********
#
# **********
# GNU General Public License v2.0 or later:
#
# 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.
#
# **********
#
# This file is part of Mbed TLS (https://tls.mbed.org)
#
# Purpose
#
# Comments and uncomments #define lines in the given header file and optionally
# sets their value or can get the value. This is to provide scripting control of
# what preprocessor symbols, and therefore what build time configuration flags
# are set in the 'config.h' file.
#
# Usage: config.pl [-f <file> | --file <file>] [-o | --force]
# [set <symbol> <value> | unset <symbol> | get <symbol> |
# full | realfull]
#
# Full usage description provided below.
#
# The following options are disabled instead of enabled with "full".
#
# * Options that require additional build dependencies or unusual hardware.
# * Options that make testing less effective.
# * Options that are incompatible with other options, or more generally that
# interact with other parts of the code in such a way that a bulk enabling
# is not a good way to test them.
# * Options that remove features.
#
# The baremetal configuration excludes options that require a library or
# operating system feature that is typically not present on bare metal
# systems. Features that are excluded from "full" won't be in "baremetal"
# either.
use warnings;
use strict;
my $config_file = "include/mbedtls/config.h";
my $usage = <<EOU;
$0 [-f <file> | --file <file>] [-o | --force]
[set <symbol> <value> | unset <symbol> | get <symbol> |
full | realfull | baremetal]
Commands
set <symbol> [<value>] - Uncomments or adds a #define for the <symbol> to
the configuration file, and optionally making it
of <value>.
If the symbol isn't present in the file an error
is returned.
unset <symbol> - Comments out the #define for the given symbol if
present in the configuration file.
get <symbol> - Finds the #define for the given symbol, returning
an exitcode of 0 if the symbol is found, and 1 if
not. The value of the symbol is output if one is
specified in the configuration file.
full - Uncomments all #define's in the configuration file
excluding some reserved symbols, until the
'Module configuration options' section
realfull - Uncomments all #define's with no exclusions
baremetal - Sets full configuration suitable for baremetal build.
Options
-f | --file <filename> - The file or file path for the configuration file
to edit. When omitted, the following default is
used:
$config_file
-o | --force - If the symbol isn't present in the configuration
file when setting its value, a #define is
appended to the end of the file.
EOU
my @excluded = qw(
MBEDTLS_CTR_DRBG_USE_128_BIT_KEY
MBEDTLS_DEPRECATED_REMOVED
MBEDTLS_DEPRECATED_WARNING
MBEDTLS_ECP_NO_INTERNAL_RNG
MBEDTLS_HAVE_SSE2
MBEDTLS_MEMORY_BACKTRACE
MBEDTLS_MEMORY_BUFFER_ALLOC_C
MBEDTLS_MEMORY_DEBUG
MBEDTLS_NO_64BIT_MULTIPLICATION
MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
MBEDTLS_NO_PLATFORM_ENTROPY
MBEDTLS_NO_UDBL_DIVISION
MBEDTLS_PKCS11_C
MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
MBEDTLS_REMOVE_3DES_CIPHERSUITES
MBEDTLS_REMOVE_ARC4_CIPHERSUITES
MBEDTLS_RSA_NO_CRT
MBEDTLS_SSL_HW_RECORD_ACCEL
MBEDTLS_TEST_NULL_ENTROPY
MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
MBEDTLS_ZLIB_SUPPORT
_ALT\s*$
);
# Things that should be disabled in "baremetal"
my @excluded_baremetal = qw(
MBEDTLS_ENTROPY_NV_SEED
MBEDTLS_FS_IO
MBEDTLS_HAVEGE_C
MBEDTLS_HAVE_TIME
MBEDTLS_HAVE_TIME_DATE
MBEDTLS_MEMORY_BACKTRACE
MBEDTLS_MEMORY_BUFFER_ALLOC_C
MBEDTLS_NET_C
MBEDTLS_PLATFORM_FPRINTF_ALT
MBEDTLS_PLATFORM_NV_SEED_ALT
MBEDTLS_PLATFORM_TIME_ALT
MBEDTLS_THREADING_C
MBEDTLS_THREADING_PTHREAD
MBEDTLS_TIMING_C
);
# Things that should be enabled in "full" even if they match @excluded.
# Platform ALTs enable global variables that allow configuring the behavior
# but default to the default behavior, except for PLATFORM_SETUP_TEARDOWN_ALT
# which requires the application to provide relevant functions like
# non-platform ALTs.
my @non_excluded = qw(
PLATFORM_(?!SETUP_TEARDOWN_)[A-Z_0-9]+_ALT
);
# Things that should be enabled in "baremetal"
my @non_excluded_baremetal = qw(
MBEDTLS_NO_PLATFORM_ENTROPY
);
# Process the command line arguments
my $force_option = 0;
my ($arg, $name, $value, $action);
while ($arg = shift) {
# Check if the argument is an option
if ($arg eq "-f" || $arg eq "--file") {
$config_file = shift;
-f $config_file or die "No such file: $config_file\n";
}
elsif ($arg eq "-o" || $arg eq "--force") {
$force_option = 1;
}
else
{
# ...else assume it's a command
$action = $arg;
if ($action eq "full" || $action eq "realfull" || $action eq "baremetal" ) {
# No additional parameters
die $usage if @ARGV;
}
elsif ($action eq "unset" || $action eq "get") {
die $usage unless @ARGV;
$name = shift;
}
elsif ($action eq "set") {
die $usage unless @ARGV;
$name = shift;
$value = shift if @ARGV;
}
else {
die "Command '$action' not recognised.\n\n".$usage;
}
}
}
# If no command was specified, exit...
if ( not defined($action) ){ die $usage; }
# Check the config file is present
if (! -f $config_file) {
chdir '..' or die;
# Confirm this is the project root directory and try again
if ( !(-d 'scripts' && -d 'include' && -d 'library' && -f $config_file) ) {
die "If no file specified, must be run from the project root or scripts directory.\n";
}
}
# Now read the file and process the contents
open my $config_read, '<', $config_file or die "read $config_file: $!\n";
my @config_lines = <$config_read>;
close $config_read;
# Add required baremetal symbols to the list that is included.
if ( $action eq "baremetal" ) {
@non_excluded = ( @non_excluded, @non_excluded_baremetal );
}
my ($exclude_re, $no_exclude_re, $exclude_baremetal_re);
if ($action eq "realfull") {
$exclude_re = qr/^$/;
$no_exclude_re = qr/./;
} else {
$exclude_re = join '|', @excluded;
$no_exclude_re = join '|', @non_excluded;
}
if ( $action eq "baremetal" ) {
$exclude_baremetal_re = join '|', @excluded_baremetal;
}
my $config_write = undef;
if ($action ne "get") {
open $config_write, '>', $config_file or die "write $config_file: $!\n";
}
my $done;
for my $line (@config_lines) {
if ($action eq "full" || $action eq "realfull" || $action eq "baremetal" ) {
if ($line =~ /name SECTION: Module configuration options/) {
$done = 1;
}
if (!$done && $line =~ m!^//\s?#define! &&
( $line !~ /$exclude_re/ || $line =~ /$no_exclude_re/ ) &&
( $action ne "baremetal" || ( $line !~ /$exclude_baremetal_re/ ) ) ) {
$line =~ s!^//\s?!!;
}
if (!$done && $line =~ m!^\s?#define! &&
! ( ( $line !~ /$exclude_re/ || $line =~ /$no_exclude_re/ ) &&
( $action ne "baremetal" || ( $line !~ /$exclude_baremetal_re/ ) ) ) ) {
$line =~ s!^!//!;
}
} elsif ($action eq "unset") {
if (!$done && $line =~ /^\s*#define\s*$name\b/) {
$line = '//' . $line;
$done = 1;
}
} elsif (!$done && $action eq "set") {
if ($line =~ m!^(?://)?\s*#define\s*$name\b!) {
$line = "#define $name";
$line .= " $value" if defined $value && $value ne "";
$line .= "\n";
$done = 1;
}
} elsif (!$done && $action eq "get") {
if ($line =~ /^\s*#define\s*$name(?:\s+(.*?))\s*(?:$|\/\*|\/\/)/) {
$value = $1;
$done = 1;
}
}
if (defined $config_write) {
print $config_write $line or die "write $config_file: $!\n";
}
}
# Did the set command work?
if ($action eq "set" && $force_option && !$done) {
# If the force option was set, append the symbol to the end of the file
my $line = "#define $name";
$line .= " $value" if defined $value && $value ne "";
$line .= "\n";
$done = 1;
print $config_write $line or die "write $config_file: $!\n";
}
if (defined $config_write) {
close $config_write or die "close $config_file: $!\n";
}
if ($action eq "get") {
if ($done) {
if ($value ne '') {
print "$value\n";
}
exit 0;
} else {
# If the symbol was not found, return an error
exit 1;
}
}
if ($action eq "full" && !$done) {
die "Configuration section was not found in $config_file\n";
}
if ($action ne "full" && $action ne "unset" && !$done) {
die "A #define for the symbol $name was not found in $config_file\n";
}
__END__
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