Signed-off-by: Florian Pritz <bluewind(a)xinu.at>
---
contrib/doc/verify-pacman-repo-db.1.txt | 50 ++++++
contrib/verify-pacman-repo-db.pl | 279 ++++++++++++++++++++++++++++++++
2 files changed, 329 insertions(+)
create mode 100644 contrib/doc/verify-pacman-repo-db.1.txt
create mode 100755 contrib/verify-pacman-repo-db.pl
diff --git a/contrib/doc/verify-pacman-repo-db.1.txt b/contrib/doc/verify-pacman-repo-db.1.txt
new file mode 100644
index 0000000..01eafbe
--- /dev/null
+++ b/contrib/doc/verify-pacman-repo-db.1.txt
@@ -0,0 +1,50 @@
+/////
+vim:set ts=4 sw=4 syntax=asciidoc noet spell spelllang=en_us:
+/////
+verify-pacman-repo-db(1)
+=======================
+
+Name
+----
+verify-pacman-repo-db - package repository verification utility
+
+
+Synopsis
+--------
+'verify-pacman-repo-db' [options]
+
+
+Description
+-----------
+'verify-pacman-repo-db' looks at a pacman repo database and verifies its
+content with the actual package files. The database is expected to be in
+the same directory as the packages (or symlinks to the packages).
+
+The following properties are verified for each package in the database:
+
+ - existence of the package file
+ - file size
+ - MD5 and SHA256 checksum (--checksum)
+
+Options
+-------
+*-h, \--help*::
+ Output a short help message.
+
+*\--debug*::
+ Enable debug output.
+
+*-c, \--checksum*::
+ Verify checksums of packages. Note that this means all packages files will
+ be read from disk. Otherwise only metadata is compared which does not
+ require to read package file contents.
+
+*-t, \--threads* <number>::
+ Use 'number' threads to verify packages. Note that each thread may use up
+ to approximately 128MiB of memory. Default: 1
+
+See Also
+--------
+linkman:repo-add[8]
+
+include::footer.txt[]
diff --git a/contrib/verify-pacman-repo-db.pl b/contrib/verify-pacman-repo-db.pl
new file mode 100755
index 0000000..71cfddf
--- /dev/null
+++ b/contrib/verify-pacman-repo-db.pl
@@ -0,0 +1,279 @@
+#!/usr/bin/perl -T
+use warnings;
+use strict;
+
+=pod
+
+=head1 SYNOPSIS
+
+verify-pacman-repo-db.pl [options] <database file> ...
+
+ Options:
+ --help, -h Show short help message
+ --debug Enable debug output
+ --checksum, -c Verify checksums of packages
+ --thread, -t <num> Use num threads to verify packages. Default: 1
+ NOTE: Each thread uses up to approx. 128MiB of memory
+
+=head1 DESCRIPTION
+
+verify-pacman-repo-db.pl looks at a pacman repo database and verifies its content
+with the actual package files. The database is expected to be in the same
+directory as the packages (or symlinks to the packages).
+
+The following properties are verified for each package in the database:
+
+ - existence of the package file
+ - file size
+ - MD5 and SHA256 checksum (--checksum)
+
+=head1 NOTES
+
+This script does intentionally not use any ALPM libraries. The format is simple
+enough to be parsed and this way we might just detect more problems because the
+libalpm parsing code might also have bugs. We also stay much more portable
+which might be good for people that want to check a db, but don't actually have
+pacman installed.
+
+=cut
+
+package main;
+use Getopt::Long;
+use Pod::Usage;
+
+exit main();
+
+sub main {
+ my %opts = (
+ threads => 1,
+ );
+
+ Getopt::Long::Configure ("bundling");
+ pod2usage(-verbose => 0) if (@ARGV== 0);
+ GetOptions(\%opts, "help|h", "debug", "threads|t=i", "checksum|c") or pod2usage(2);
+ pod2usage(0) if $opts{help};
+
+ my $verifier = Verifier->new(\%opts);
+
+ for my $repodb (@ARGV) {
+ $verifier->check_repodb($repodb);
+ }
+
+ $verifier->finalize();
+ return $verifier->get_error_status();
+}
+
+package Verifier;
+use Archive::Tar;
+use Digest::MD5;
+use Digest::SHA;
+use File::Basename;
+use threads;
+use threads::shared;
+use Thread::Queue;
+
+sub new {
+ my $class = shift;
+ my $opts = shift;
+
+ my $self :shared = shared_clone({
+ opts => \%{$opts},
+ package_queue => Thread::Queue->new(),
+ output_queue => Thread::Queue->new(),
+ workers => [],
+ errors => 0,
+ });
+
+ bless $self, $class;
+ $self->start_workers();
+ return $self;
+}
+
+sub start_workers {
+ my $self = shift;
+
+ threads->new(\&_worker_output_queue, $self);
+
+ for (my $i = 0; $i < $self->{opts}->{threads}; $i++) {
+ my $thr :shared = shared_clone(threads->new(\&_worker_package_queue, $self));
+ push @{$self->{workers}}, $thr;
+ }
+}
+
+sub _worker_package_queue {
+ my $self = shift;
+ while (my $workpack = $self->{package_queue}->dequeue()) {
+ my $dbdata = $self->_parse_db_entry($workpack->{db_desc_content});
+ $self->{errors} += $self->_verify_db_entry($workpack->{dirname}, $dbdata);
+ }
+}
+
+sub _worker_output_queue {
+ my $self = shift;
+ while (my $output = $self->{output_queue}->dequeue()) {
+ print STDERR $output;
+ }
+}
+
+sub finalize {
+ my $self = shift;
+
+ $self->{package_queue}->end();
+ $self->_join_threads($self->{workers});
+
+ $self->{output_queue}->end();
+ $self->_join_threads([threads->list]);
+}
+
+sub _join_threads {
+ my $self = shift;
+ my $threads = shift;
+
+ for my $thr (@{$threads}) {
+ if ($thr->tid && !threads::equal($thr, threads->self)) {
+ print "waiting for thread ".$thr->tid()." to finish\n" if $self->{opts}->{debug};
+ $thr->join;
+ }
+ }
+}
+
+sub get_error_status {
+ my $self = shift;
+
+ return $self->{errors} > 0;
+}
+
+sub check_repodb {
+ my $self = shift;
+ my $repodb = shift;
+
+ my $db = Archive::Tar->new();
+ $db->read($repodb);
+
+ my $dirname = dirname($repodb);
+ my $pkgcount = 0;
+
+ my @files = $db->list_files();
+ for my $file_object ($db->get_files()) {
+ if ($file_object->name =~ m/^([^\/]+)\/desc$/) {
+ my $package = $1;
+ $self->{package_queue}->enqueue({
+ package => $package,
+ db_desc_content => $file_object->get_content(),
+ dirname => $dirname,
+ });
+ $pkgcount++;
+ }
+ }
+
+ $self->_debug(sprintf("Queued %d package from database '%s'\n", $pkgcount, $repodb));
+}
+
+sub _parse_db_entry {
+ my $self = shift;
+ my $content = shift;
+ my %db;
+ my $key;
+
+ for my $line (split /\n/, $content) {
+ if ($line eq '') {
+ $key = undef;
+ next;
+ }
+ if ($line =~ m/^%(.+)%$/) {
+ $key = $1;
+ } else {
+ push @{$db{$key}}, $line;
+ die "\$key not set. Is the db formated incorrectly?" unless $key;
+ }
+ }
+ return \%db;
+}
+
+sub _output {
+ my $self = shift;
+ my $output = shift;
+
+ return if $output eq "";
+
+ $output = sprintf("Thread %s: %s", threads->self->tid(), $output);
+ $self->{output_queue}->enqueue($output);
+}
+
+sub _debug {
+ my $self = shift;
+ my $output = shift;
+ $self->_output($output) if $self->{opts}->{debug};
+}
+
+sub _verify_db_entry {
+ my $self = shift;
+ my $basedir = shift;
+ my $dbdata = shift;
+ my $ret = 0;
+ my $output = "";
+
+ # verify package exists
+ my $pkgfile = $basedir.'/'.$dbdata->{FILENAME}[0];
+ $self->_debug(sprintf("Checking package %s\n", $dbdata->{FILENAME}[0]));
+ unless (-e $pkgfile) {
+ $self->_output(sprintf("Package file missing: %s\n", $pkgfile));
+ return 1;
+ }
+
+ $ret += $self->_verify_package_size($dbdata, $pkgfile);
+ $ret += $self->_verify_package_checksum($dbdata, $pkgfile) if $self->{opts}->{checksum};
+ # TODO verify gpg sigs?
+
+ return $ret;
+}
+
+sub _verify_package_size {
+ my $self = shift;
+ my $dbdata = shift;
+ my $pkgfile = shift;
+
+ my $csize = $dbdata->{CSIZE}[0];
+ my $filesize = (stat($pkgfile))[7];
+ unless ($csize == $filesize) {
+ $self->_output(sprintf("Package file has incorrect size: %d vs %d: %s\n", $csize, $filesize, $pkgfile));
+ return 1;
+ }
+ return 0;
+}
+
+sub _verify_package_checksum {
+ my $self = shift;
+ my $dbdata = shift;
+ my $pkgfile = shift;
+
+ my $md5 = Digest::MD5->new;
+ my $sha = Digest::SHA->new(256);
+
+ my $content;
+ # 128MiB to keep random IO low when using multiple threads (only works for large packages though)
+ my $chunksize = 1024*1024*128;
+ open my $fh, "<", $pkgfile;
+ while (read($fh, $content, $chunksize)) {
+ $md5->add($content);
+ $sha->add($content);
+ }
+
+ my $expected_sha = $dbdata->{SHA256SUM}[0];
+ my $expected_md5 = $dbdata->{MD5SUM}[0];
+ my $got_md5 = $md5->hexdigest;
+ my $got_sha = $sha->hexdigest;
+
+ unless ($expected_sha eq $got_sha and $expected_md5 eq $got_md5) {
+ my $output;
+ $output .= sprintf "Package file has incorrect checksum: %s\n", $pkgfile;
+ $output .= sprintf "expected: SHA %s\n", $expected_sha;
+ $output .= sprintf "got: SHA %s\n", $got_sha;
+ $output .= sprintf "expected: MD5 %s\n", $expected_md5;
+ $output .= sprintf "got: MD5 %s\n", $got_md5;
+ $self->_output($output);
+ return 1;
+ }
+ return 0;
+}
+
--
2.9.0