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Diffstat (limited to 'lib/dns/spnego_asn1.pl')
| -rw-r--r-- | lib/dns/spnego_asn1.pl | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/lib/dns/spnego_asn1.pl b/lib/dns/spnego_asn1.pl new file mode 100644 index 0000000..66f7b73 --- /dev/null +++ b/lib/dns/spnego_asn1.pl @@ -0,0 +1,193 @@ +#!/bin/bin/perl -w +# +# Copyright (C) Internet Systems Consortium, Inc. ("ISC") +# +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. +# +# See the COPYRIGHT file distributed with this work for additional +# information regarding copyright ownership. + +# Our SPNEGO implementation uses some functions generated by the +# Heimdal ASN.1 compiler, which this script then whacks a bit to make +# them work properly in this stripped down implementation. We don't +# want to require our users to have a copy of the compiler, so we ship +# the output of this script, but we need to keep the script around in +# any case to cope with future changes to the SPNEGO ASN.1 code, so we +# might as well supply the script for users who want it. + +# Overall plan: run the ASN.1 compiler, run each of its output files +# through indent, fix up symbols and whack everything to be static. +# We use indent for two reasons: (1) to whack the Heimdal compiler's +# output into something closer to ISC's coding standard, and (2) to +# make it easier for this script to parse the result. + +# Output from this script is C code which we expect to be #included +# into another C file, which is why everything generated by this +# script is marked "static". The intent is to minimize the number of +# extern symbols exported by the SPNEGO implementation, to avoid +# potential conflicts with the GSSAPI libraries. + +### + +# Filename of the ASN.1 specification. Hardcoded for the moment +# since this script is intended for compiling exactly one module. + +my $asn1_source = $ENV{ASN1_SOURCE} || "spnego.asn1"; + +# Heimdal ASN.1 compiler. This script was written using the version +# from Heimdal 0.7.1. To build this, download a copy of +# heimdal-0.7.1.tar.gz, configure and build with the default options, +# then look for the compiler in heimdal-0.7.1/lib/asn1/asn1_compile. + +my $asn1_compile = $ENV{ASN1_COMPILE} || "asn1_compile"; + +# BSD indent program. This script was written using the version of +# indent that comes with FreeBSD 4.11-STABLE. The GNU project, as +# usual, couldn't resist the temptation to monkey with indent's +# command line syntax, so this probably won't work with GNU indent. + +my $indent = $ENV{INDENT} || "indent"; + +### + +# Step 1: run the compiler. Input is the ASN.1 file. Outputs are a +# header file (name specified on command line without the .h suffix), +# a file called "asn1_files" listing the names of the other output +# files, and a set of files containing C code generated by the +# compiler for each data type that the compiler found. + +if (! -r $asn1_source || system($asn1_compile, $asn1_source, "asn1")) { + die("Couldn't compile ASN.1 source file $asn1_source\n"); +} + +my @files = ("asn1.h"); + +open(F, "asn1_files") + or die("Couldn't open asn1_files: $!\n"); +push(@files, split) + while (<F>); +close(F); + +unlink("asn1_files"); + +### + +# Step 2: generate header block. + +print(q~/* + * Copyright (C) 2006 Internet Systems Consortium, Inc. ("ISC") + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: spnego_asn1.pl,v 1.4 2007/06/19 23:47:16 tbox Exp $ */ + +/*! \file + * \brief Method routines generated from SPNEGO ASN.1 module. + * See spnego_asn1.pl for details. Do not edit. + */ + +~); + +### + +# Step 3: read and process each generated file, then delete it. + +my $output; + +for my $file (@files) { + + my $is_static = 0; + + system($indent, "-di1", "-ldi1", $file) == 0 + or die("Couldn't indent $file"); + + unlink("$file.BAK"); + + open(F, $file) + or die("Couldn't open $file: $!"); + + while (<F>) { + + # Symbol name fixups + + s/heim_general_string/general_string/g; + s/heim_octet_string/octet_string/g; + s/heim_oid/oid/g; + s/heim_utf8_string/utf8_string/g; + + # Convert all externs to statics + + if (/^static/) { + $is_static = 1; + } + + if (!/^typedef/ && + !$is_static && + /^[A-Za-z_][0-9A-Za-z_]*[ \t]*($|[^:0-9A-Za-z_])/) { + $_ = "static " . $_; + $is_static = 1; + } + + if (/[{};]/) { + $is_static = 0; + } + + # Suppress file inclusion, pass anything else through + + if (!/#include/) { + $output .= $_; + } + } + + close(F); + unlink($file); +} + +# Step 4: Delete unused stuff to avoid code bloat and compiler warnings. + +my @unused_functions = qw(ContextFlags2int + int2ContextFlags + asn1_ContextFlags_units + length_NegTokenInit + copy_NegTokenInit + length_NegTokenResp + copy_NegTokenResp + length_MechTypeList + length_MechType + copy_MechTypeList + length_ContextFlags + copy_ContextFlags + copy_MechType); + +$output =~ s<^static [^\n]+\n$_\(.+?^}></* unused function: $_ */\n>ms + foreach (@unused_functions); + +$output =~ s<^static .+$_\(.*\);$></* unused declaration: $_ */>m + foreach (@unused_functions); + +$output =~ s<^static struct units ContextFlags_units\[\].+?^};> + </* unused variable: ContextFlags_units */>ms; + +$output =~ s<^static int asn1_NegotiationToken_dummy_holder = 1;> + </* unused variable: asn1_NegotiationToken_dummy_holder */>ms; + +$output =~ s<^static void\nfree_ContextFlags\(ContextFlags \* data\)\n{\n> + <$&\t(void)data;\n>ms; + +# Step 5: Write the result. + +print($output); + |