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script/pl2exe.pl  view on Meta::CPAN

print OUT "MZ(<<'EXE_STUFF') # -*-Perl-*-\015\012";
print OUT "Here comes offset 60 .....\015\012";

# The DWORD at offset 60 holds the offset of the IMAGE_NT_HEADERS struct.
# This stuff is in winnt.h.
print OUT pack ("L", 64);

my $code_size = 512;	# actually the size of the entire
			# code section, which in this case contains
			# data as well; rounded up to a multiple of 512

# Construct the IMAGE_NT_HEADERS structure.
my $headers = "PE\0\0";		# Portable Executable signature
$headers .= pack ('SSLLLSS',	# the IMAGE_FILE_HEADER substructure
		  0x14c,	# for Intel I386 or later, and compatible
		  1,		# number of sections
		  0x4d5a83be,	# time-date stamp when we created the exe (TODO)
		  0,0,		# symbols pointer, # symbols
		  224,		# size of the IMAGE_OPTIONAL_HEADER
		  0x010f	# random flags: 0xa18e(?) for a DLL
		  );
$headers .= pack ('SCCL9S6L4SSL6',# IMAGE_OPTIONAL_HEADERS substruct
		  0x010b,	# Magic PE32 : normal 32-bit, 0x0107 would be a ROM image
		  1,0,		# linker version maj.min (that's us)
		  $code_size,
		  0,0,		# size of initialized/un- data
		  0x1000,	# RVA of entry point
		  		# (the RVA is the address when loaded,
		  		# relative to the image base)
		  0x1000,	# RVA of start of code section
		  0,		# RVA of data section, if there were one
		  0x400000,	# image base
		  0x1000,	# section alignment
		  512,		# file alignment
		  4, 0,		# OS version maj.min
		  0, 0,		# Image version
		  4, 0,		# Subsystem version
		  0,		# reserved1 zero
		  0x2000,	# size of image
		  512,		# size of headers
		  0,		# checksum; ignored
		  3,		# Subsystem 3=console app; 2=GUI app
		  0,		# DLL characteristics (obsolete)
		  0x1000,	# size of stack reserve
		  0x1000,	# size of stack commit
		  0x100000,	# size of heap reserve
		  0,		# size of heap commit
		  0,		# loader flags (obsolete)
		  16		# the number or RVA/size pairs to follow
		  );
# DATA directory (16)
$headers .= pack ('L32',	# 16 (RVA,size) pairs locating certain
		  		# important image structures; the ones
		  		# we don't have are left zero
		  0,0,          # export directory
		  0x1100, 195,	# import directory
		  0,0,  	# resource directory
                  0,0,		# exception table
                  0,0,		# security table
		  0x10f8, 8,	# base relocation table (empty, but needed)
		  0,0,		# debug
                  0,0,		# architecture specific data
                  0,0,		# global pointer
                  0,0,		# TLS dir
                  0,0,		# load config table
                  0,0,		# bound import table
                  0,0,		# import address table
                  0,0,		# delay import descriptor
                  0,0,		# COM descriptor
                  0,0		# unused
		  );
print OUT $headers;

# SECTION TABLE, We need to describe our one section.
my $section_header = pack ('a8L8',
			   '.perl',	# section name
			   464,		# raw data size
			   0x1000,	# section begin RVA
			   512,		# rounded-up data size
			   512,		# offset in file
			   0,0,0,	# relocations, line # offs, line #s
			   0xe0000060,	# flags: CODE INITIALIZED_DATA EXECUTE READ WRITE ALIGN_DEFAULT(16)
			   );
print OUT $section_header;

print OUT "\015\012\015\012";
print OUT "-------------that was the IMAGE_NT_HEADERS struct-------------";
print OUT "\015\012------------------------\015\012";
print OUT "--------Now comes the code (at offset 512, if you please)-----";
print OUT "\015\012\015\012";

# Next comes the code.
# It performs fixups, prepends "perl -x " to the command line,
# launches perl, and returns perl's exit status. See at the end.

print OUT pack ("H*", "b8cc114000833dcc1140000074168b1085d27d06");
print OUT pack ("H*", "01500483c004ff0283c00483380075eaa1481140");
print OUT pack ("H*", "00ffd089c389c731c0b9f7fffffffcf2ae89f829");
print OUT pack ("H*", "d883e1fc01ccbec311400089e7b908000000f3a4");
print OUT pack ("H*", "89de89c1f3a489e383ec7cb91b00000089e731c0");
print OUT pack ("H*", "f3ab895c2404c74424284400000089e083c02889");
print OUT pack ("H*", "44242083c04489442424a140114000ffd021c075");
print OUT pack ("H*", "046a64eb258b4424446aff50a14c114000ffd021");
print OUT pack ("H*", "c074046a65eb0f8b4424446a665450a150114000");
print OUT pack ("H*", "ffd0a144114000ffd0");

print OUT "\015\012\015\012";
print OUT "-------here's the data, at file offset 760: -------";
print OUT "\015\012\015\012";

# Print out a dummy relocation table.
# The code is not relocatable--it must be loaded at 0x400000.
# But to allow programs to load it with LoadLibrary() and access
# its resources, the file must contain this table.
print OUT pack ('LL', 0x1000,8);

# The import table.  Contains RVAs and names.
# (we import 5 functions from KERNEL32.DLL)
print OUT pack ('L5', 0x1128, # (unbound IAT)
                      0,      # TimeDateStamp
                      0,      # ForwarderChain
                      0x1158, # DLL Name RVA
		      0x1140);# Import Address Table RVA
print OUT pack ('L5', 0,0,0,0,0); # Ordinals of our KERNEL32 names, 0=unused
print OUT pack ('L6', 0x1166, 0x1178, 0x1186, 0x1198, 0x11ae, 0);
# Not sure if we really need to do this twice, but why argue:
print OUT pack ('L6', 0x1166, 0x1178, 0x1186, 0x1198, 0x11ae, 0);
# Gee it would be nice if C<pack> knew how to align things...
print OUT "KERNEL32.DLL\0\0";
print OUT "\0\0CreateProcessA\0\0"; 	# 1140
print OUT "\0\0ExitProcess\0";		# 1144
print OUT "\0\0GetCommandLineA\0";	# 1148
print OUT "\0\0WaitForSingleObject\0";	# 114c
print OUT "\0\0GetExitCodeProcess\0";	# 1150

# Our initialized data:
print OUT "perl -x \0"; # 11c3
# align 4
print OUT pack ('L*', 0);

# Let Perl know we're done.  We no longer care about CRLF.
print OUT "\nEXE_STUFF\nif 0;\n\n";

$_ = <IN>;
unless ($_ =~ /^\#!.*perl/ ) {
    print OUT "#!perl\n";
}
print OUT $_, <IN>;
close IN;
close OUT;
chmod 0755, $name;

__END__

=pod

  # base: 401000
  objdump -D --target=binary --architecture i386 $code

   0:   b8 cc 11 40 00          mov    $0x4011cc,%eax
   5:   83 3d cc 11 40 00 00    cmpl   $0x0,0x4011cc
   c:   74 16                   je     0x24
   e:   8b 10                   mov    (%eax),%edx
  10:   85 d2                   test   %edx,%edx
  12:   7d 06                   jge    0x1a
  14:   01 50 04                add    %edx,0x4(%eax)
  17:   83 c0 04                add    $0x4,%eax
  1a:   ff 02                   incl   (%edx)
  1c:   83 c0 04                add    $0x4,%eax
  1f:   83 38 00                cmpl   $0x0,(%eax)
  22:   75 ea                   jne    0xe
  24:   a1 48 11 40 00          mov    0x401148,%eax