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|
#!/usr/bin/env perl
use strict;
use IPC::Open2;
if ($ARGV[0] eq '--version') {
print "scandeps version 1.0\n";
print "Copright (c) 2005 Hongli Lai\n";
print "Licensed under the GNU General Public License v2.\n";
exit;
} elsif ($ARGV[0] eq '--help') {
print "Usage: scandeps [FILES...]\n";
print "This script scans ELF binaries' library dependancies and prints a nice report\n" .
"of the dependancies.\n";
exit;
}
# First, generate a list of binaries. Either scan user-specified files,
# or scan all files in the current directory (including subfolders).
my @files;
if (@ARGV > 0) {
# Scan user-specified files
@files = @ARGV;
} else {
# Scan directory recursively
@files = scandir(".");
}
# Now get the dependancies for all binaries
# %fileDeps: hash which contains a list of dependancies. The filename is the key.
# %depFiles: hash which contains a list of files. The dependancy is the key.
my (%fileDeps, %depFiles);
getdeps(\%fileDeps, \%depFiles, \@files);
print "Common dependancies:\n";
foreach my $dep (keys %depFiles) {
if (@{$depFiles{$dep}} == @files) {
print " $dep\n";
}
}
print "\n";
print "All dependancies:\n";
my @keys = keys %depFiles;
@keys = sort { @{$depFiles{$b}} - @{$depFiles{$a}} } @keys;
foreach my $dep (@keys) {
my $num = scalar(@{$depFiles{$dep}});
my $word = ($num > 1) ? "files" : "file";
printf " %-40s (used by %3d $word)\n", $dep, $num;
}
print "\n";
print "Dependancies and associated binaries:\n";
foreach my $dep (@keys) {
print " $dep:\n";
if (@{$depFiles{$dep}} == @files) {
print " All files depend on this library.\n";
} else {
foreach my $file (@{$depFiles{$dep}}) {
print " $file\n";
}
}
print "\n";
}
##################################
sub fatal {
print STDERR $_[0];
exit 1;
}
sub isELF {
my ($f, $data);
if (!open($f, $_[0])) {
print STDERR "Warning: cannot open file '$_[0]' for reading.\n";
return 0;
}
binmode $f;
sysread $f, $data, 4;
close $f;
return $data eq "\177ELF";
}
sub scandir {
my $d;
if (!opendir($d, $_[0])) {
print STDERR "Warning: cannot open directory '$_[0]' for reading.\n";
return;
}
my @files;
foreach my $file (readdir($d)) {
next if ($file eq "." || $file eq "..");
$file = "$_[0]/$file";
if (-d $file) {
# Recurse into subdirectory
push @files, scandir("$file");
} elsif (-f $file && -x $file && isELF($file)) {
push @files, $file;
}
}
closedir($d);
return @files;
}
sub getdeps {
my ($fileDeps, $depFiles, $files) = @_;
my ($r, $w);
if (!open2($r, $w, 'objdump', '-p', @{$files})) {
fatal("Cannot communicate with objdump.\n");
}
close $w;
my $currentFile;
foreach my $line (<$r>) {
if ($line =~ /^(.+):[ \t]+file format /) {
$currentFile = $1;
$currentFile =~ s/^.\///;
} elsif ($line =~ /NEEDED[ \t]+(.+)$/) {
$fileDeps->{$currentFile} = [] if (!exists $fileDeps->{$currentFile});
push @{$fileDeps->{$currentFile}}, $1;
$depFiles->{$1} = [] if (!exists $depFiles->{$1});
push @{$depFiles->{$1}}, $currentFile;
}
}
close $r;
}
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