util/mkdef.pl

   1 #! /usr/bin/env perl
   2 # Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9 # Generate a linker version script suitable for the given platform
  10 # from a given ordinals file.
  11
  12 use strict;
  13 use warnings;
  14
  15 use Getopt::Long;
  16 use FindBin;
  17 use lib "$FindBin::Bin/perl";
  18
  19 use OpenSSL::Ordinals;
  20
  21 use lib '.';
  22 use configdata;
  23
  24 my $name = undef;               # internal library/module name
  25 my $ordinals_file = undef;      # the ordinals file to use
  26 my $version = undef;            # the version to use for the library
  27 my $OS = undef;                 # the operating system family
  28 my $verbose = 0;
  29 my $ctest = 0;
  30
  31 # For VMS, some modules may have case insensitive names
  32 my $case_insensitive = 0;
  33
  34 GetOptions('name=s'     => \$name,
  35            'ordinals=s' => \$ordinals_file,
  36            'version=s'  => \$version,
  37            'OS=s'       => \$OS,
  38            'ctest'      => \$ctest,
  39            'verbose'    => \$verbose,
  40            # For VMS
  41            'case-insensitive' => \$case_insensitive)
  42     or die "Error in command line arguments\n";
  43
  44 die "Please supply arguments\n"
  45     unless $name && $ordinals_file && $OS;
  46
  47 # When building a "variant" shared library, with a custom SONAME, also customize
  48 # all the symbol versions.  This produces a shared object that can coexist
  49 # without conflict in the same address space as a default build, or an object
  50 # with a different variant tag.
  51 #
  52 # For example, with a target definition that includes:
  53 #
  54 #         shlib_variant => "-opt",
  55 #
  56 # we build the following objects:
  57 #
  58 # $ perl -le '
  59 #     for (@ARGV) {
  60 #         if ($l = readlink) {
  61 #             printf "%s -> %s\n", $_, $l
  62 #         } else {
  63 #             print
  64 #         }
  65 #     }' *.so*
  66 # libcrypto-opt.so.1.1
  67 # libcrypto.so -> libcrypto-opt.so.1.1
  68 # libssl-opt.so.1.1
  69 # libssl.so -> libssl-opt.so.1.1
  70 #
  71 # whose SONAMEs and dependencies are:
  72 #
  73 # $ for l in *.so; do
  74 #     echo $l
  75 #     readelf -d $l | egrep 'SONAME|NEEDED.*(ssl|crypto)'
  76 #   done
  77 # libcrypto.so
  78 #  0x000000000000000e (SONAME)             Library soname: [libcrypto-opt.so.1.1]
  79 # libssl.so
  80 #  0x0000000000000001 (NEEDED)             Shared library: [libcrypto-opt.so.1.1]
  81 #  0x000000000000000e (SONAME)             Library soname: [libssl-opt.so.1.1]
  82 #
  83 # We case-fold the variant tag to upper case and replace all non-alnum
  84 # characters with "_".  This yields the following symbol versions:
  85 #
  86 # $ nm libcrypto.so | grep -w A
  87 # 0000000000000000 A OPENSSL_OPT_1_1_0
  88 # 0000000000000000 A OPENSSL_OPT_1_1_0a
  89 # 0000000000000000 A OPENSSL_OPT_1_1_0c
  90 # 0000000000000000 A OPENSSL_OPT_1_1_0d
  91 # 0000000000000000 A OPENSSL_OPT_1_1_0f
  92 # 0000000000000000 A OPENSSL_OPT_1_1_0g
  93 # $ nm libssl.so | grep -w A
  94 # 0000000000000000 A OPENSSL_OPT_1_1_0
  95 # 0000000000000000 A OPENSSL_OPT_1_1_0d
  96 #
  97 (my $SO_VARIANT = uc($target{"shlib_variant"} // '')) =~ s/\W/_/g;
  98
  99 my $apiv = undef;
 100 $apiv = sprintf "%x%02x%02x", split(/\./, $config{api})
 101     if $config{api};
 102
 103 my $libname = $unified_info{sharednames}->{$name} // $name;
 104
 105 my %OS_data = (
 106     solaris     => { writer     => \&writer_linux,
 107                      sort       => sorter_linux(),
 108                      platforms  => { UNIX                       => 1,
 109                                      EXPORT_VAR_AS_FUNCTION     => 0 } },
 110     linux       => 'solaris',   # alias
 111     "bsd-gcc"   => 'solaris',   # alias
 112     aix         => { writer     => \&writer_aix,
 113                      sort       => sorter_unix(),
 114                      platforms  => { UNIX                       => 1,
 115                                      EXPORT_VAR_AS_FUNCTION     => 0 } },
 116     VMS         => { writer     => \&writer_VMS,
 117                      sort       => OpenSSL::Ordinals::by_number(),
 118                      platforms  => { VMS                        => 1,
 119                                      EXPORT_VAR_AS_FUNCTION     => 0 } },
 120     vms         => 'VMS',       # alias
 121     WINDOWS     => { writer     => \&writer_windows,
 122                      sort       => OpenSSL::Ordinals::by_name(),
 123                      platforms  => { WIN32                      => 1,
 124                                      _WIN32                     => 1,
 125                                      EXPORT_VAR_AS_FUNCTION     => 1 } },
 126     windows     => 'WINDOWS',   # alias
 127     WIN32       => 'WINDOWS',   # alias
 128     win32       => 'WIN32',     # alias
 129     32          => 'WIN32',     # alias
 130     NT          => 'WIN32',     # alias
 131     nt          => 'WIN32',     # alias
 132     mingw       => 'WINDOWS',   # alias
 133    );
 134
 135 do {
 136     die "Unknown operating system family $OS\n"
 137         unless exists $OS_data{$OS};
 138     $OS = $OS_data{$OS};
 139 } while(ref($OS) eq '');
 140
 141 my %disabled_uc = map { my $x = uc $_; $x =~ s|-|_|g; $x => 1 } keys %disabled;
 142
 143 my %ordinal_opts = ();
 144 $ordinal_opts{sort} = $OS->{sort} if $OS->{sort};
 145 $ordinal_opts{filter} =
 146     sub {
 147         my $item = shift;
 148         return
 149             $item->exists()
 150             && platform_filter($item)
 151             && feature_filter($item);
 152     };
 153 my $ordinals = OpenSSL::Ordinals->new(from => $ordinals_file);
 154
 155 my $writer = $OS->{writer};
 156 $writer = \&writer_ctest if $ctest;
 157
 158 $writer->($ordinals->items(%ordinal_opts));
 159
 160 exit 0;
 161
 162 sub platform_filter {
 163     my $item = shift;
 164     my %platforms = ( $item->platforms() );
 165
 166     # True if no platforms are defined
 167     return 1 if scalar keys %platforms == 0;
 168
 169     # For any item platform tag, return the equivalence with the
 170     # current platform settings if it exists there, return 0 otherwise
 171     # if the item platform tag is true
 172     for (keys %platforms) {
 173         if (exists $OS->{platforms}->{$_}) {
 174             return $platforms{$_} == $OS->{platforms}->{$_};
 175         }
 176         if ($platforms{$_}) {
 177             return 0;
 178         }
 179     }
 180
 181     # Found no match?  Then it's a go
 182     return 1;
 183 }
 184
 185 sub feature_filter {
 186     my $item = shift;
 187     my @features = ( $item->features() );
 188
 189     # True if no features are defined
 190     return 1 if scalar @features == 0;
 191
 192     my $verdict = ! grep { $disabled_uc{$_} } @features;
 193
 194     if ($apiv) {
 195         foreach (@features) {
 196             next unless /^DEPRECATEDIN_(\d+)(?:_(\d+)_(\d+))?$/;
 197             my $symdep = sprintf "%x%02x%02x", $1, ($2 // 0), ($3 // 0);
 198             $verdict = 0 if $apiv ge $symdep;
 199         }
 200     }
 201
 202     return $verdict;
 203 }
 204
 205 sub sorter_unix {
 206     my $by_name = OpenSSL::Ordinals::by_name();
 207     my %weight = (
 208         'FUNCTION'      => 1,
 209         'VARIABLE'      => 2
 210        );
 211
 212     return sub {
 213         my $item1 = shift;
 214         my $item2 = shift;
 215
 216         my $verdict = $weight{$item1->type()} <=> $weight{$item2->type()};
 217         if ($verdict == 0) {
 218             $verdict = $by_name->($item1, $item2);
 219         }
 220         return $verdict;
 221     };
 222 }
 223
 224 sub sorter_linux {
 225     my $by_version = OpenSSL::Ordinals::by_version();
 226     my $by_unix = sorter_unix();
 227
 228     return sub {
 229         my $item1 = shift;
 230         my $item2 = shift;
 231
 232         my $verdict = $by_version->($item1, $item2);
 233         if ($verdict == 0) {
 234             $verdict = $by_unix->($item1, $item2);
 235         }
 236         return $verdict;
 237     };
 238 }
 239
 240 sub writer_linux {
 241     my $thisversion = '';
 242     my $currversion_s = '';
 243     my $prevversion_s = '';
 244     my $indent = 0;
 245
 246     for (@_) {
 247         if ($thisversion && $_->version() ne $thisversion) {
 248             die "$ordinals_file: It doesn't make sense to have both versioned ",
 249                 "and unversioned symbols"
 250                 if $thisversion eq '*';
 251             print <<"_____";
 252 }${prevversion_s};
 253 _____
 254             $prevversion_s = " OPENSSL${SO_VARIANT}_$thisversion";
 255             $thisversion = '';  # Trigger start of next section
 256         }
 257         unless ($thisversion) {
 258             $indent = 0;
 259             $thisversion = $_->version();
 260             $currversion_s = '';
 261             $currversion_s = "OPENSSL${SO_VARIANT}_$thisversion "
 262                 if $thisversion ne '*';
 263             print <<"_____";
 264 ${currversion_s}{
 265     global:
 266 _____
 267         }
 268         print '        ', $_->name(), ";\n";
 269     }
 270
 271     print <<"_____";
 272     local: *;
 273 }${prevversion_s};
 274 _____
 275 }
 276
 277 sub writer_aix {
 278     for (@_) {
 279         print $_->name(),"\n";
 280     }
 281 }
 282
 283 sub writer_windows {
 284     print <<"_____";
 285 ;
 286 ; Definition file for the DLL version of the $libname library from OpenSSL
 287 ;
 288
 289 LIBRARY         $libname
 290
 291 EXPORTS
 292 _____
 293     for (@_) {
 294         print "    ",$_->name(),"\n";
 295     }
 296 }
 297
 298 sub collect_VMS_mixedcase {
 299     return [ 'SPARE', 'SPARE' ] unless @_;
 300
 301     my $s = shift;
 302     my $s_uc = uc($s);
 303     my $type = shift;
 304
 305     return [ "$s=$type", 'SPARE' ] if $s_uc eq $s;
 306     return [ "$s_uc/$s=$type", "$s=$type" ];
 307 }
 308
 309 sub collect_VMS_uppercase {
 310     return [ 'SPARE' ] unless @_;
 311
 312     my $s = shift;
 313     my $s_uc = uc($s);
 314     my $type = shift;
 315
 316     return [ "$s_uc=$type" ];
 317 }
 318
 319 sub writer_VMS {
 320     my @slot_collection = ();
 321     my $collector =
 322         $case_insensitive ? \&collect_VMS_uppercase : \&collect_VMS_mixedcase;
 323
 324     my $last_num = 0;
 325     foreach (@_) {
 326         while (++$last_num < $_->number()) {
 327             push @slot_collection, $collector->(); # Just occupy a slot
 328         }
 329         my $type = {
 330             FUNCTION    => 'PROCEDURE',
 331             VARIABLE    => 'DATA'
 332            } -> {$_->type()};
 333         push @slot_collection, $collector->($_->name(), $type);
 334     }
 335
 336     print <<"_____" if defined $version;
 337 IDENTIFICATION=$version
 338 _____
 339     print <<"_____" unless $case_insensitive;
 340 CASE_SENSITIVE=YES
 341 _____
 342     print <<"_____";
 343 SYMBOL_VECTOR=(-
 344 _____
 345     # It's uncertain how long aggregated lines the linker can handle,
 346     # but it has been observed that at least 1024 characters is ok.
 347     # Either way, this means that we need to keep track of the total
 348     # line length of each "SYMBOL_VECTOR" statement.  Fortunately, we
 349     # can have more than one of those...
 350     my $symvtextcount = 16;     # The length of "SYMBOL_VECTOR=("
 351     while (@slot_collection) {
 352         my $set = shift @slot_collection;
 353         my $settextlength = 0;
 354         foreach (@$set) {
 355             $settextlength +=
 356                 + 3             # two space indentation and comma
 357                 + length($_)
 358                 + 1             # postdent
 359                 ;
 360         }
 361         $settextlength--;       # only one space indentation on the first one
 362         my $firstcomma = ',';
 363
 364         if ($symvtextcount + $settextlength > 1024) {
 365             print <<"_____";
 366 )
 367 SYMBOL_VECTOR=(-
 368 _____
 369             $symvtextcount = 16; # The length of "SYMBOL_VECTOR=("
 370         }
 371         if ($symvtextcount == 16) {
 372             $firstcomma = '';
 373         }
 374
 375         my $indent = ' '.$firstcomma;
 376         foreach (@$set) {
 377             print <<"_____";
 378 $indent$_ -
 379 _____
 380             $symvtextcount += length($indent) + length($_) + 1;
 381             $indent = '  ,';
 382         }
 383     }
 384     print <<"_____";
 385 )
 386 _____
 387
 388     if (defined $version) {
 389         my ($libvmajor, $libvminor) = $version =~ /^(\d+)_(\d+)$/;
 390         print <<"_____";
 391 GSMATCH=LEQUAL,$libvmajor,$libvminor;
 392 _____
 393     }
 394 }
 395
 396 sub writer_ctest {
 397     print <<'_____';
 398 /*
 399  * Test file to check all DEF file symbols are present by trying
 400  * to link to all of them. This is *not* intended to be run!
 401  */
 402
 403 int main()
 404 {
 405 _____
 406
 407     for (@_) {
 408         if ($_->type() eq 'VARIABLE') {
 409             print "\textern int ", $_->name(), '; /* type unknown */ /* ', $_->number(), ' ', $_->version(), " */\n";
 410         } else {
 411             print "\textern int ", $_->name(), '(); /* type unknown */ /* ', $_->number(), ' ', $_->version(), " */\n";
 412         }
 413     }
 414     print <<'_____';
 415 }
 416 _____
 417 }