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# Copyright © 2007-2009 Raphaël Hertzog <hertzog@debian.org> # Copyright © 2009, 2012-2019, 2021 Guillem Jover <guillem@debian.org> # # 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, see <https://www.gnu.org/licenses/>. package Dpkg::Control::HashCore; use strict; use warnings; our $VERSION = '1.02'; use Dpkg::Gettext; use Dpkg::ErrorHandling; use Dpkg::Control::FieldsCore; # This module cannot use Dpkg::Control::Fields, because that one makes use # of Dpkg::Vendor which at the same time uses this module, which would turn # into a compilation error. We can use Dpkg::Control::FieldsCore instead. use parent qw(Dpkg::Interface::Storable); use overload '%{}' => sub { ${$_[0]}->{fields} }, 'eq' => sub { "$_[0]" eq "$_[1]" }; =encoding utf8 =head1 NAME Dpkg::Control::HashCore - parse and manipulate a stanza of deb822 fields =head1 DESCRIPTION The Dpkg::Control::Hash class is a hash-like representation of a set of RFC822-like fields. The fields names are case insensitive and are always capitalized the same when output (see field_capitalize function in Dpkg::Control::Fields). The order in which fields have been set is remembered and is used to be able to dump back the same content. The output order can also be overridden if needed. You can store arbitrary values in the hash, they will always be properly escaped in the output to conform to the syntax of control files. This is relevant mainly for multilines values: while the first line is always output unchanged directly after the field name, supplementary lines are modified. Empty lines and lines containing only dots are prefixed with " ." (space + dot) while other lines are prefixed with a single space. During parsing, trailing spaces are stripped on all lines while leading spaces are stripped only on the first line of each field. =head1 METHODS =over 4 =item $c = Dpkg::Control::Hash->new(%opts) Creates a new object with the indicated options. Supported options are: =over 8 =item allow_pgp Configures the parser to accept OpenPGP signatures around the control information. Value can be 0 (default) or 1. =item allow_duplicate Configures the parser to allow duplicate fields in the control information. The last value overrides any previous values. Value can be 0 (default) or 1. =item keep_duplicate Configure the parser to keep values for duplicate fields found in the control information (when B<allow_duplicate> is enabled), as array references. Value can be 0 (default) or 1. =item drop_empty Defines if empty fields are dropped during the output. Value can be 0 (default) or 1. =item name The user friendly name of the information stored in the object. It might be used in some error messages or warnings. A default name might be set depending on the type. =item is_pgp_signed Set by the parser (starting in dpkg 1.17.0) if it finds an OpenPGP signature around the control information. Value can be 0 (default) or 1, and undef when the option is not supported by the code (in versions older than dpkg 1.17.0). =back =cut sub new { my ($this, %opts) = @_; my $class = ref($this) || $this; # Object is a scalar reference and not a hash ref to avoid # infinite recursion due to overloading hash-dereferencing my $self = \{ in_order => [], out_order => [], is_pgp_signed => 0, allow_pgp => 0, allow_duplicate => 0, keep_duplicate => 0, drop_empty => 0, }; bless $self, $class; $$self->{fields} = Dpkg::Control::HashCore::Tie->new($self); # Options set by the user override default values $$self->{$_} = $opts{$_} foreach keys %opts; return $self; } # There is naturally a circular reference between the tied hash and its # containing object. Happily, the extra layer of scalar reference can # be used to detect the destruction of the object and break the loop so # that everything gets garbage-collected. sub DESTROY { my $self = shift; delete $$self->{fields}; } =item $c->set_options($option, %opts) Changes the value of one or more options. =cut sub set_options { my ($self, %opts) = @_; $$self->{$_} = $opts{$_} foreach keys %opts; } =item $value = $c->get_option($option) Returns the value of the corresponding option. =cut sub get_option { my ($self, $k) = @_; return $$self->{$k}; } =item $c->parse_error($file, $fmt, ...) Prints an error message and dies on syntax parse errors. =cut sub parse_error { my ($self, $file, $msg) = (shift, shift, shift); $msg = sprintf($msg, @_) if (@_); error(g_('syntax error in %s at line %d: %s'), $file, $., $msg); } =item $c->parse($fh, $description) Parse a control file from the given filehandle. Exits in case of errors. $description is used to describe the filehandle, ideally it's a filename or a description of where the data comes from. It's used in error messages. When called multiple times, the parsed fields are accumulated. Returns true if some fields have been parsed. =cut sub parse { my ($self, $fh, $desc) = @_; my $paraborder = 1; my $parabody = 0; my $cf; # Current field my $expect_pgp_sig = 0; local $_; while (<$fh>) { # In the common case there will be just a trailing \n character, # so using chomp here which is very fast will avoid the latter # s/// doing anything, which gives usa significant speed up. chomp; my $armor = $_; s/\s+$//; next if length == 0 and $paraborder; my $lead = substr $_, 0, 1; next if $lead eq '#'; $paraborder = 0; my ($name, $value) = split /\s*:\s*/, $_, 2; if (defined $name and $name =~ m/^\S+?$/) { $parabody = 1; if ($lead eq '-') { $self->parse_error($desc, g_('field cannot start with a hyphen')); } if (exists $self->{$name}) { unless ($$self->{allow_duplicate}) { $self->parse_error($desc, g_('duplicate field %s found'), $name); } if ($$self->{keep_duplicate}) { if (ref $self->{$name} ne 'ARRAY') { # Switch value into an array. $self->{$name} = [ $self->{$name}, $value ]; } else { # Append the value. push @{$self->{$name}}, $value; } } else { # Overwrite with last value. $self->{$name} = $value; } } else { $self->{$name} = $value; } $cf = $name; } elsif (m/^\s(\s*\S.*)$/) { my $line = $1; unless (defined($cf)) { $self->parse_error($desc, g_('continued value line not in field')); } if ($line =~ /^\.+$/) { $line = substr $line, 1; } $self->{$cf} .= "\n$line"; } elsif (length == 0 || ($expect_pgp_sig && $armor =~ m/^-----BEGIN PGP SIGNATURE-----[\r\t ]*$/)) { if ($expect_pgp_sig) { # Skip empty lines $_ = <$fh> while defined && m/^\s*$/; unless (length) { $self->parse_error($desc, g_('expected OpenPGP signature, ' . 'found end of file after blank line')); } chomp; unless (m/^-----BEGIN PGP SIGNATURE-----[\r\t ]*$/) { $self->parse_error($desc, g_('expected OpenPGP signature, ' . "found something else '%s'"), $_); } # Skip OpenPGP signature while (<$fh>) { chomp; last if m/^-----END PGP SIGNATURE-----[\r\t ]*$/; } unless (defined) { $self->parse_error($desc, g_('unfinished OpenPGP signature')); } # This does not mean the signature is correct, that needs to # be verified by an OpenPGP backend. $$self->{is_pgp_signed} = 1; } # Finished parsing one stanza. last; } elsif ($armor =~ m/^-----BEGIN PGP SIGNED MESSAGE-----[\r\t ]*$/) { $expect_pgp_sig = 1; if ($$self->{allow_pgp} and not $parabody) { # Skip OpenPGP headers while (<$fh>) { last if m/^\s*$/; } } else { $self->parse_error($desc, g_('OpenPGP signature not allowed here')); } } else { $self->parse_error($desc, g_('line with unknown format (not field-colon-value)')); } } if ($expect_pgp_sig and not $$self->{is_pgp_signed}) { $self->parse_error($desc, g_('unfinished OpenPGP signature')); } return defined($cf); } =item $c->load($file) Parse the content of $file. Exits in case of errors. Returns true if some fields have been parsed. =item $c->find_custom_field($name) Scan the fields and look for a user specific field whose name matches the following regex: /X[SBC]*-$name/i. Return the name of the field found or undef if nothing has been found. =cut sub find_custom_field { my ($self, $name) = @_; foreach my $key (keys %$self) { return $key if $key =~ /^X[SBC]*-\Q$name\E$/i; } return; } =item $c->get_custom_field($name) Identify a user field and retrieve its value. =cut sub get_custom_field { my ($self, $name) = @_; my $key = $self->find_custom_field($name); return $self->{$key} if defined $key; return; } =item $str = $c->output() =item "$c" Get a string representation of the control information. The fields are sorted in the order in which they have been read or set except if the order has been overridden with set_output_order(). =item $c->output($fh) Print the string representation of the control information to a filehandle. =cut sub output { my ($self, $fh) = @_; my $str = ''; my @keys; if (@{$$self->{out_order}}) { my $i = 1; my $imp = {}; $imp->{$_} = $i++ foreach @{$$self->{out_order}}; @keys = sort { if (defined $imp->{$a} && defined $imp->{$b}) { $imp->{$a} <=> $imp->{$b}; } elsif (defined($imp->{$a})) { -1; } elsif (defined($imp->{$b})) { 1; } else { $a cmp $b; } } keys %$self; } else { @keys = @{$$self->{in_order}}; } foreach my $key (@keys) { if (exists $self->{$key}) { my $value = $self->{$key}; # Skip whitespace-only fields next if $$self->{drop_empty} and $value !~ m/\S/; # Escape data to follow control file syntax my ($first_line, @lines) = split /\n/, $value; my $kv = "$key:"; $kv .= ' ' . $first_line if length $first_line; $kv .= "\n"; foreach (@lines) { s/\s+$//; if (length == 0 or /^\.+$/) { $kv .= " .$_\n"; } else { $kv .= " $_\n"; } } # Print it out if ($fh) { print { $fh } $kv or syserr(g_('write error on control data')); } $str .= $kv if defined wantarray; } } return $str; } =item $c->save($filename) Write the string representation of the control information to a file. =item $c->set_output_order(@fields) Define the order in which fields will be displayed in the output() method. =cut sub set_output_order { my ($self, @fields) = @_; $$self->{out_order} = [@fields]; } =item $c->apply_substvars($substvars) Update all fields by replacing the variables references with the corresponding value stored in the Dpkg::Substvars object. =cut sub apply_substvars { my ($self, $substvars, %opts) = @_; # Add substvars to refer to other fields $substvars->set_field_substvars($self, 'F'); foreach my $f (keys %$self) { my $v = $substvars->substvars($self->{$f}, %opts); if ($v ne $self->{$f}) { my $sep; $sep = field_get_sep_type($f); # If we replaced stuff, ensure we're not breaking # a dependency field by introducing empty lines, or multiple # commas if ($sep & (FIELD_SEP_COMMA | FIELD_SEP_LINE)) { # Drop empty/whitespace-only lines $v =~ s/\n[ \t]*(\n|$)/$1/; } if ($sep & FIELD_SEP_COMMA) { $v =~ s/,[\s,]*,/,/g; $v =~ s/^\s*,\s*//; $v =~ s/\s*,\s*$//; } } # Replace ${} with $, which is otherwise an invalid substitution, but # this then makes it possible to use ${} as an escape sequence such # as ${}{VARIABLE}. $v =~ s/\$\{\}/\$/g; $self->{$f} = $v; } } package Dpkg::Control::HashCore::Tie; # This class is used to tie a hash. It implements hash-like functions by # normalizing the name of fields received in keys (using # Dpkg::Control::Fields::field_capitalize). It also stores the order in # which fields have been added in order to be able to dump them in the # same order. But the order information is stored in a parent object of # type Dpkg::Control. use strict; use warnings; use Dpkg::Control::FieldsCore; use Carp; use Tie::Hash; use parent -norequire, qw(Tie::ExtraHash); # $self->[0] is the real hash # $self->[1] is a reference to the hash contained by the parent object. # This reference bypasses the top-level scalar reference of a # Dpkg::Control::Hash, hence ensuring that reference gets DESTROYed # properly. # Dpkg::Control::Hash->new($parent) # # Return a reference to a tied hash implementing storage of simple # "field: value" mapping as used in many Debian-specific files. sub new { my $class = shift; my $hash = {}; tie %{$hash}, $class, @_; ## no critic (Miscellanea::ProhibitTies) return $hash; } sub TIEHASH { my ($class, $parent) = @_; croak 'parent object must be Dpkg::Control::Hash' if not $parent->isa('Dpkg::Control::HashCore') and not $parent->isa('Dpkg::Control::Hash'); return bless [ {}, $$parent ], $class; } sub FETCH { my ($self, $key) = @_; $key = lc($key); return $self->[0]->{$key} if exists $self->[0]->{$key}; return; } sub STORE { my ($self, $key, $value) = @_; $key = lc($key); if (not exists $self->[0]->{$key}) { push @{$self->[1]->{in_order}}, field_capitalize($key); } $self->[0]->{$key} = $value; } sub EXISTS { my ($self, $key) = @_; $key = lc($key); return exists $self->[0]->{$key}; } sub DELETE { my ($self, $key) = @_; my $parent = $self->[1]; my $in_order = $parent->{in_order}; $key = lc($key); if (exists $self->[0]->{$key}) { delete $self->[0]->{$key}; @{$in_order} = grep { lc ne $key } @{$in_order}; return 1; } else { return 0; } } sub FIRSTKEY { my $self = shift; my $parent = $self->[1]; foreach my $key (@{$parent->{in_order}}) { return $key if exists $self->[0]->{lc $key}; } } sub NEXTKEY { my ($self, $last) = @_; my $parent = $self->[1]; my $found = 0; foreach my $key (@{$parent->{in_order}}) { if ($found) { return $key if exists $self->[0]->{lc $key}; } else { $found = 1 if $key eq $last; } } return; } 1; =back =head1 CHANGES =head2 Version 1.02 (dpkg 1.21.0) New option: "keep_duplicate" in new(). =head2 Version 1.01 (dpkg 1.17.2) New method: $c->parse_error(). =head2 Version 1.00 (dpkg 1.17.0) Mark the module as public. =cut 1;