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ptool1.3.pl
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ptool1.3.pl
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#!/usr/bin/perl
#
# ptool
# This program will read and give some information about mach-o files. Kind of more complete otool -l
#
# (c) 2011 Fractal Guru - reverse\@put.as - http://reverse.put.as
#
# Feel free to do whatever you want with this code (keep the credits!)
#
# * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
# * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# * POSSIBILITY OF SUCH DAMAGE.
#
# Version 1.2: Fixed lame bug in sections offset display (only the first one was correct)
# Added descriptions for section type
#
# Version 1.3: Add ARM support for iOS binaries and add options to display only LC_UNIXTHREAD and LC_ENCRYPTION_INFO segments
# Support to edit entry points in all binaries (option -e)
#
# TODO: allow to process only one kind of command ?
# calculate offset to patch (integrate offset.pl ?)
# dumper
# display only what we want, sections for example
my $VERSION = "1.3";
# change me to 1 to have debug messages
my $debug = 0;
#use strict;
# using () so ctime isn't exported else it will conflict with Time::localtime and maybe others. perldoc POSIX
use POSIX();
# for ctime conversions
use Time::localtime;
# for underlines and bolds
use Term::Cap;
my ($normal, $bold, $under, $endu, $t);
my $termios = new POSIX::Termios; $termios->getattr;
my $ospeed = $termios->getospeed;
my $t = Tgetent Term::Cap { TERM => undef, OSPEED => $ospeed };
($normal, $bold, $under, $endu) = map { $t->Tputs($_,1) } qw/me md us ue/;
# command line options
use Getopt::Std;
# Define options
getopts("df:H:hpf:t:e:l:i:a:r:uc", \%arg);
# Set option defaults
$arg{h} = 0 unless $arg{h};
$arg{a} = "" unless $arg{a};
$arg{r} = "" unless $arg{r};
$arg{e} = "" unless $arg{e};
$arg{u} = 0 unless $arg{u};
$arg{c} = 0 unless $arg{c};
# definitions
my %table;
my $buffer = "";
# from /usr/include/mach-o/loader.h
my %filetypedesc = ( 1=>"MH_OBJECT" , 2=>"MH_EXECUTE", 3=>"MH_FVMLIB", 4=>"MH_CORE", 5=>"MH_PRELOAD", 6=>"MH_DYLIB", 7=>"MH_DYLINKER", 8=>"MH_BUNDLE", 9=>"MH_DYLIB_STUB",
10=>"MH_DSYM", 11=>"MH_KEXT_BUNDLE");
# from include/mach/machine.h
my %cputypedesc = ( 7=>"x86", 12=>"ARM", 18=>"PowerPC", 16777223=>"x86-64", 16777234=>"PowerPC64");
# from /usr/include/mach-o/loader.h
my %cmdtypedesc = ( 0x1=>"LC_SEGMENT", 0x2=>"LC_SYMTAB", 0x3=>"LC_SYMSEG", 0x4=>"LC_THREAD", 0x5=>"LC_UNIXTHREAD", 0x6=>"LC_LOADFVMLIB", 0x7=>"LC_IDFVMLIB",
0x8=>"LC_IDENT", 0x9=>"LC_FVMFILE", 0xa=>"LC_PREPAGE", 0xb=>"LC_DYSYMTAB", 0xc=>"LC_LOAD_DYLIB", 0xd=>"LC_ID_DYLIB", 0xe=>"LC_LOAD_DYLINKER",
0xf=>"LC_ID_DYLINKER", 0x10=>"LC_PREBOUND_DYLIB", 0x11=>"LC_ROUTINES", 0x12=>"LC_SUB_FRAMEWORK", 0x13=>"LC_SUB_UMBRELLA", 0x14=>"LC_SUB_CLIENT",
0x15=>"LC_SUB_LIBRARY", 0x16=>"LC_TWOLEVEL_HINTS", 0x17=>"LC_PREBIND_CKSUM", 0x80000018=>"LC_LOAD_WEAK_DYLIB", 0x19=>"LC_SEGMENT_64",
0x1a=>"LC_ROUTINES_64", 0x1b=>"LC_UUID", 0x8000001c=>"LC_RPATH", 0x1d=>"LC_CODE_SIGNATURE", 0x1e=>"LC_SEGMENT_SPLIT_INFO",
0x8000001f=>"LC_REEXPORT_DYLIB", 0x20=>"LC_LAZY_LOAD_DYLIB", 0x21=>"LC_ENCRYPTION_INFO", 0x22=>"LC_DYLD_INFO", 0x80000022=>"LC_DYLD_INFO_ONLY",
0x80000023=>"LC_LOAD_UPWARD_DYLIB");
my %sectiontypeconstants = (0x0=>"S_REGULAR", 0x1=>"S_ZEROFILL", 0x2=>"S_CSTRING_LITERALS", 0x3=>"S_4BYTE_LITERALS", 0x4=>"S_8BYTE_LITERALS", 0x5=>"S_LITERAL_POINTERS",
0x6=>"S_NON_LAZY_SYMBOL_POINTERS", 0x7=>"S_LAZY_SYMBOL_POINTERS", 0x8=>"S_SYMBOL_STUBS", 0x9=>"S_MOD_INIT_FUNC_POINTERS",
0xa=>"S_MOD_TERM_FUNC_POINTERS", 0xb=>"S_COALESCED", 0xc=>"S_GB_ZEROFILL", 0xd=>"S_INTERPOSING", 0xe=>"S_16BYTE_LITERALS",
0xf=>"S_DTRACE_DOF", 0x10=>"S_LAZY_DYLIB_SYMBOL_POINTERS", 0x11=>"S_THREAD_LOCAL_REGULAR", 0x12=>"S_THREAD_LOCAL_ZEROFILL",
0x13=>"S_THREAD_LOCAL_VARIABLES", 0x14=>"S_THREAD_LOCAL_VARIABLE_POINTERS", 0x15=>"S_THREAD_LOCAL_INIT_FUNCTION_POINTERS");
my $info = <<INFO;
ptool v$VERSION
......................................................
(c) 2011 fG! - http://reverse.put.as - reverse\@put.as
Usage: $0 [-a arch] [-e new entrypoint] [-u] [-c] <file>
Where:
<file> = File to read header from
[-a arch] = Obtain info only related to this architecture (if available): x86, x86_64, ppc, arm, armv6, armv7
[-e new entrypoint] = New entrypoint to modify
[-u] = show only LC_UNIXTHREAD load command (to see entrypoint)
[-c] = show only LC_ENCRYPTION_INFO load command (can be combined with -u option)
Example for x86:
$0 -a x86 /bin/ls
Example for PPC:
$0 -a ppc /bin/ls
Example for modifying entrypoint in x86:
$0 -a x86 -e 0x1234 /bin/ls
Example for showing only the LC_UNIXTHREAD in ARMv7:
$0 -a armv7 -u /bin/ls
INFO
my $header = <<HEADER;
ptool v$VERSION
......................................................
(c) 2011 fG! - http://reverse.put.as - reverse\@put.as
HEADER
sub help
{
print $info;
exit 1;
}
if (!defined($ARGV[0]) || $arg{i} == 1)
{
help();
}
# because options not processed by Getopts stay in @ARGV
my $filetoopen = $ARGV[0];
if (! -e $filetoopen)
{
print $header;
print "ERROR: Can't access file $filetoopen !\n";
exit(1);
}
# architecture to read specific info from
#my $target = lc($ARGV[1]);
my $target = $arg{a};
# offset to analyse
my $researchoffset = $arg{r};
# create filehandle
# if we want to edit open read/write
if ($arg{e})
{
open(FILE,"+<$filetoopen") or die("ERROR: Can't open $filetoopen in write mode\n");
}
# else just read
else
{
open(FILE,"<$filetoopen") or die("ERROR: Can't open $filetoopen in read mode\n");
}
#struct fat_header @ /usr/include/mach-o/fat.h
#{
# uint32_t magic;
# uint32_t nfat_arch;
#};
# Total Size: 8 bytes
sysseek(FILE,0,0);
sysread(FILE, $buffer, 8);
# this is always big-endian
my ($magicheader, $nfat_arch) = unpack("NN", $buffer);
# if it's a fat binary we need to find where the i386 binary is
my ($i, @fatinfo, $x86baseaddress, $ppcbaseaddress, $x86_64baseaddress, $armbaseaddress);
# TODO: VERIFY IF THE REQUESTED ARCHITECTURE EXISTS IN THE BINARY
if ($magicheader == 0xcafebabe)
{
my $fatbinary = 1;
printf("Magic Header: 0x%x [offset: 0x%08x]\n", $magicheader, 0);
# it's rather safe (but still incorrect) to assume there is a i386 and PPC binary inside the fat binary.
# still incorrect because it could have a x86 and x86_64 and no PPC... I can live with it for now ;)
printf("Found a Mach-O fat binary with %d architectures! [offset: 0x%08x]\n", $nfat_arch, 4);
print "Finding available architectures base address...\n" if $debug;
#struct fat_arch @ /usr/include/mach-o/fat.h
#{
# cpu_type_t cputype;
# cpu_subtype_t cpusubtype;
# uint32_t offset;
# uint32_t size;
# uint32_t align;
#};
# Total Size: 20 bytes
my $initialposition = sysseek(FILE, 0, 1);
# read info from all available binaries inside
for ($i=0; $i < $nfat_arch; $i++)
{
sysread(FILE, $buffer, 20);
($fatinfo[$i]->{'cputype'}, $fatinfo[$i]->{'cpusubtype'}, $fatinfo[$i]->{'offset'}, $fatinfo[$i]->{'size'}, $fatinfo[$i]->{'align'}) = unpack("NNNNN", $buffer);
# x86
if ($fatinfo[$i]->{'cputype'} == 7) { $baseaddresses{'x86'} = $fatinfo[$i]->{'offset'}; }
# PPC
elsif ($fatinfo[$i]->{'cputype'} == 18) { $baseaddresses{'ppc'} = $fatinfo[$i]->{'offset'}; }
# x86_64
elsif ($fatinfo[$i]->{'cputype'} == 16777223) { $baseaddresses{'x64'} = $fatinfo[$i]->{'offset'}; }
# ARM_ALL
elsif ($fatinfo[$i]->{'cputype'} == 12 && $fatinfo[$i]->{'cpusubtype'} == 0x0) { $baseaddresses{'arm'} = $fatinfo[$i]->{'offset'}; }
# ARM_V6
elsif ($fatinfo[$i]->{'cputype'} == 12 && $fatinfo[$i]->{'cpusubtype'} == 0x6) { $baseaddresses{'armv6'} = $fatinfo[$i]->{'offset'}; }
# ARM_V7
elsif ($fatinfo[$i]->{'cputype'} == 12 && $fatinfo[$i]->{'cpusubtype'} == 0x9) { $baseaddresses{'armv7'} = $fatinfo[$i]->{'offset'}; }
}
printf("Intel x86 base address: 0x%08x\n", $baseaddresses{'x86'}) if $baseaddresses{'x86'};
printf("Intel x86_64 base address: 0x%08x\n", $baseaddresses{'x64'}) if $baseaddresses{'x64'};
printf("PPC base address: 0x%08x\n", $baseaddresses{'ppc'}) if $baseaddresses{'ppc'};
printf("ARM_ALL base address: 0x%08x\n", $baseaddresses{'arm'}) if $baseaddresses{'arm'};
printf("ARM_V6 base address: 0x%08x\n", $baseaddresses{'armv6'}) if $baseaddresses{'armv6'};
printf("ARM_V7 base address: 0x%08x\n", $baseaddresses{'armv7'}) if $baseaddresses{'armv7'};
# $targetbaseaddress = $x86baseaddress if ($target eq "i386");
# $targetbaseaddress = $ppcbaseaddress if ($target eq "ppc");
# if it's a single cpu binary then base address is 0
}
elsif ($magicheader == 0xcefaedfe)
{
print "Found a Mach-O x86 (or ARM) only binary!\n" if $debug;
$baseaddresses{'x86'} = 0x0;
$baseaddresses{'arm'} = 0x0;
$baseaddresses{'armv6'} = 0x0;
$baseaddresses{'armv7'} = 0x0;
# it can be x86 or arm, we need to detect which one later
$target = "x86";
# FIXME - requires -a to be specified if implemented like this
# if ($target ne $arg{a}) { print "ERROR: Specified architecture $arg{a} not available in this binary\n"; exit(1)};
}
elsif ($magicheader == 0xfeedface)
{
print "Found a Mach-O PPC only binary!\n" if $debug;
$baseaddresses{'ppc'} = 0x0;
$target = "ppc";
}
elsif ($magicheader == 0xcffaedfe)
{
print "Found a Mach-O x86_64 only binary!\n" if $debug;
$baseaddresses{'x64'} = 0x0;
$target = "x86_64";
}
# for 32bits
#struct mach_header @ /usr/include/mach-o/loader.h
#{
# uint32_t magic; /* mach magic number identifier */
# cpu_type_t cputype; /* cpu specifier */
# cpu_subtype_t cpusubtype; /* machine specifier */
# uint32_t filetype; /* type of file */
# uint32_t ncmds; /* number of load commands */
# uint32_t sizeofcmds; /* the size of all the load commands */
# uint32_t flags; /* flags */
#};
# Total Size: 28 bytes
# for 64bits
#struct mach_header @ /usr/include/mach-o/loader.h
#{
# uint32_t magic; /* mach magic number identifier */
# cpu_type_t cputype; /* cpu specifier */
# cpu_subtype_t cpusubtype; /* machine specifier */
# uint32_t filetype; /* type of file */
# uint32_t ncmds; /* number of load commands */
# uint32_t sizeofcmds; /* the size of all the load commands */
# uint32_t flags; /* flags */
# uint32_t reserved; /* reserved */
#};
# Total Size: 32 bytes
# if there is a $target set, then we just read that architecture, else we should read the number of archs specified by $nfat_arch
# read a single arch
my $targetbaseaddress;
if ($target)
{
# 32 bits
if ($target eq "x86" || $target eq "ppc" || $target =~ /arm/)
{
# this will only apply if we have a fat binary
# in non-fat binaries we need to distinguish between x86 and arm via the cputype
$targetbaseaddress = $baseaddresses{'x86'} if ($target eq "x86");
$targetbaseaddress = $baseaddresses{'arm'} if ($target eq "arm");
$targetbaseaddress = $baseaddresses{'armv6'} if ($target eq "armv6");
$targetbaseaddress = $baseaddresses{'armv7'} if ($target eq "armv7");
$targetbaseaddress = $baseaddresses{'ppc'} if ($target eq "ppc");
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 28);
# use L in unpack because it's exactly 32bits long (that's what we want!)
# PPC is big-endian so unpack template must be different! very important ;)
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags) = unpack("LLLLLLL", $buffer) if ($target eq "x86" || $target =~ /arm/);
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags) = unpack("NNNNNNN", $buffer) if ($target eq "ppc");
# set $target variable to the correct architecture
if ($cputype == 12 && cpusubtype == 0x0)
{
$target = "arm";
}
elsif ($cputype == 12 && cpusubtype == 0x6)
{
$target = "armv6";
}
elsif ($cputype == 12 && cpusubtype == 0x9)
{
$target = "armv7";
}
elsif ($cputype == 7)
{
$target = "x86";
}
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, 0,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
}
# and 64 bits
if ($target eq "x86_64")
{
$targetbaseaddress = $baseaddresses{'x64'};
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 32);
# use L in unpack because it's exactly 32bits long (that's what we want!)
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, $reserved) = unpack("LLLLLLLL", $buffer);
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, $reserved,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
}
}
# read all archs - only makes sense if we have a fat binary
else
{
# $fatinfo has all the information that we need
for ($i=0; $i < $nfat_arch; $i++)
{
# x86
if ($fatinfo[$i]->{'cputype'} == 7)
{
my $target = "x86";
$targetbaseaddress = $baseaddresses{'x86'};
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 28);
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags) = unpack("LLLLLLL", $buffer);
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, 0,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
};
# ARM
if ($fatinfo[$i]->{'cputype'} == 12)
{
if ($fatinfo[$i]->{'cpusubtype'} == 0x0)
{
$target = "arm";
$targetbaseaddress = $baseaddresses{'arm'};
}
elsif ($fatinfo[$i]->{'cpusubtype'} == 0x6)
{
$target = "armv6";
$targetbaseaddress = $baseaddresses{'armv6'};
}
elsif ($fatinfo[$i]->{'cpusubtype'} == 0x9)
{
$target = "armv7";
$targetbaseaddress = $baseaddresses{'armv7'};
}
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 28);
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags) = unpack("LLLLLLL", $buffer);
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, 0,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
};
# PPC
if ($fatinfo[$i]->{'cputype'} == 18)
{
my $target = "ppc";
$targetbaseaddress = $baseaddresses{'ppc'};
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 28);
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags) = unpack("NNNNNNN", $buffer);
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, 0,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
};
# x86_64
if ($fatinfo[$i]->{'cputype'} == 16777223)
{
my $target = "x86_64";
$targetbaseaddress = $baseaddresses{'x64'};
printf("DEBUG: Reading the header info...\n") if $debug;
sysseek(FILE, $targetbaseaddress, 0);
sysread(FILE, $buffer, 28);
($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, $reserved) = unpack("LLLLLLLL", $buffer);
printf("DEBUG: Printing mach header info...\n") if $debug;
print_mach_header($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, $reserved,$targetbaseaddress,$target);
printf("DEBUG: Processing load commands...\n") if $debug;
process_load_commands($ncmds, $targetbaseaddress, $target);
};
}
}
# end of story!
close(FILE);
# this will be common to all architectures
sub print_mach_header
{
my ($magic, $cputype, $cpusubtype, $filetype, $ncmds, $sizeofcmds, $flags, $reserved,$targetbaseaddress,$target) = @_;
print("\nMach_header Information\n-----------------------\n");
printf("${bold}Target architecture:${normal} %s\n", $target);
printf("${bold}Magic number:${normal} 0x%08x [offset: 0x%08x]\n", $magic, $targetbaseaddress);
printf("${bold}Cpu type:${normal} %d - %s [offset: 0x%08x]\n", $cputype, $cputypedesc{$cputype}, $targetbaseaddress+4);
printf("${bold}Cpu subtype:${normal} %x [offset: 0x%08x]\n", $cpusubtype, $targetbaseaddress+8);
printf("${bold}Filetype:${normal} 0x%2x (%s) [offset: 0x%08x]\n", $filetype, $filetypedesc{$filetype}, $targetbaseaddress+12);
printf("${bold}Number of commands:${normal} %d (0x%x) [offset: 0x%08x]\n", $ncmds, $ncmds, $targetbaseaddress+16);
printf("${bold}Size of commands:${normal} %d bytes (0x%x) [offset: 0x%08x]\n", $sizeofcmds, $sizeofcmds, $targetbaseaddress+20);
printf("${bold}Flags:${normal} 0x%08x [offset: 0x%08x]\n", $flags, $targetbaseaddress+24);
if ($target eq "x86_64")
{
printf("${bold}Reserved field:${normal} 0x%08x [offset: 0x%08x]\n", $reserved, $targetbaseaddress+28);
}
}
#struct load_command @ /usr/include/mach-o/loader.h
#{
# uint32_t cmd;
# uint32_t cmdsize;
#};
# Total size: 8 bytes
# we need the baseaddress for each architecture so we can position and read commands
sub process_load_commands
{
my $i;
my ($ncmds, $targetbaseaddress, $target) = @_;
# put us in the correct file position for the architecture
$initialposition = sysseek(FILE, $targetbaseaddress+28, 0) if ($target eq "x86" || $target eq "ppc" || $target =~ /arm/);
$initialposition = sysseek(FILE, $targetbaseaddress+32, 0) if ($target eq "x86_64");
for ($i=0; $i < $ncmds; $i++)
{
my $buffer = "";
# read each load_command where we get cmd number and total size for it
$initialposition = sysseek(FILE, 0, 1);
sysread(FILE, $buffer, 8);
($cmd, $cmdsize) = unpack("LL", $buffer) if ($target eq "x86" || $target eq "x86_64" || $target =~ /arm/);
($cmd, $cmdsize) = unpack("NN", $buffer) if ($target eq "ppc");
$table[$i]->{'position'} = $initialposition;
$table[$i]->{'cmd'} = $cmd;
$table[$i]->{'cmdsize'} = $cmdsize;
# move to the next load command. we can find it by adding the previous load command size minus 8 (because we have read 8 bytes from the previous load command)
$seekposition = sysseek(FILE, $initialposition+$cmdsize, 0);
}
$counter = 0;
# if we are editing the entrypoint
if ($arg{e})
{
if (!$arg{a})
{
printf("\nERROR: You must specify the architecture to modify EIP!\n\n");
exit(1);
}
foreach (@table)
{
if ($_->{'cmd'} == 0x4 || $_->{'cmd'} == 0x5)
{
printf("\n${bold}Modifying EIP...${normal}\n");
modify_eip($_->{'position'}, $target, $targetbaseaddress, $counter);
}
$counter++;
}
}
# process only LC_UNIXTHREAD and/or LC_ENCRYPTION_INFO
elsif ($arg{u} || $arg{c})
{
foreach (@table)
{
### LC_UNIXTHREAD or LC_THREAD
if (($_->{'cmd'} == 0x4 || $_->{'cmd'} == 0x5) && $arg{u})
{
printf("\n--( LOAD COMMAND #%d )--------------------------[ offset: 0x%08x ]--\n", $counter, $_->{'position'});
printf("${bold}cmd name:${normal} %s (0x%x) [offset: 0x%08x]\n", $cmdtypedesc{$_->{'cmd'}}, $_->{'cmd'}, $_->{'position'});
printf("${bold}cmd size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $_->{'cmdsize'}, $_->{'cmdsize'}, $_->{'position'}+4);
process_thread_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_ENCRYPTION_INFO
elsif ($_->{'cmd'} == 0x21 && $arg{c})
{
printf("\n--( LOAD COMMAND #%d )--------------------------[ offset: 0x%08x ]--\n", $counter, $_->{'position'});
printf("${bold}cmd name:${normal} %s (0x%x) [offset: 0x%08x]\n", $cmdtypedesc{$_->{'cmd'}}, $_->{'cmd'}, $_->{'position'});
printf("${bold}cmd size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $_->{'cmdsize'}, $_->{'cmdsize'}, $_->{'position'}+4);
process_encryption_info_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
}
}
# else we are just dumping the information
else
{
foreach (@table)
{
printf("\n--( LOAD COMMAND #%d )--------------------------[ offset: 0x%08x ]--\n", $counter, $_->{'position'});
# printf("Load command number: %d [offset: 0x%08x]\n", $counter, $_->{'position'});
printf("${bold}cmd name:${normal} %s (0x%x) [offset: 0x%08x]\n", $cmdtypedesc{$_->{'cmd'}}, $_->{'cmd'}, $_->{'position'});
printf("${bold}cmd size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $_->{'cmdsize'}, $_->{'cmdsize'}, $_->{'position'}+4);
### commands LC_LOADFVMLIB, LC_IDFVMLIB, LC_IDENT and LC_FVMFILE, LC_PREPAGE are obsolete and internal, so they aren't processed (although otool does it)
### maybe in a future VERSION
# TODO: implement LC_PREBOUND_DYLIB
### process LC_SEGMENT and LC_SEGMENT_64 commands
if ($_->{'cmd'} == 0x1 || $_->{'cmd'} == 0x19 )
{
process_lc_segment($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_SYMTAB
if ($_->{'cmd'} == 0x2)
{
process_lc_symtab($_->{'position'}, $target, $targetbaseaddress, $counter);
}
if ($_->{'cmd'} == 0x3)
{
process_symseg_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_UNIXTHREAD or LC_THREAD
if ($_->{'cmd'} == 0x4 || $_->{'cmd'} == 0x5)
{
process_thread_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_ROUTINES or LC_ROUTINES_64
if ($_->{'cmd'} == 0x11 || $_->{'cmd'} == 0x1a)
{
process_routines_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_SUB_FRAMEWORK
if ($_->{'cmd'} == 0x12)
{
process_sub_framework_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_SUB_UMBRELLA
if ($_->{'cmd'} == 0x13)
{
process_sub_umbrella_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_SUB_CLIENT
if ($_->{'cmd'} == 0x14)
{
process_sub_client_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_SUB_LIBRARY
if ($_->{'cmd'} == 0x15)
{
process_sub_library_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_TWOLEVEL_HINTS
if ($_->{'cmd'} == 0x16)
{
process_twolevel_hints_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_TWOLEVEL_HINTS
if ($_->{'cmd'} == 0x17)
{
process_prebind_cksum_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_DYSYMTAB
if ($_->{'cmd'} == 0xb)
{
process_lc_dysymtab($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_ID_DYLIB, LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, LC_REEXPORT_DYLIB
if ($_->{'cmd'} == 0xd || $_->{'cmd'} == 0xc || $_->{'cmd'} == 0x80000018 || $_->{'cmd'} == 0x8000001f)
{
process_dylib_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_ID_DYLINKER or LC_LOAD_DYLINKER
if ($_->{'cmd'} == 0xf || $_->{'cmd'} == 0xe)
{
process_lc_load_dylinker($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_UUID
if ($_->{'cmd'} == 0x1b)
{
process_uuid_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO
if ($_->{'cmd'} == 0x1e || $_->{'cmd'} == 0x1d)
{
process_linkedit_data_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_ENCRYPTION_INFO
if ($_->{'cmd'} == 0x21)
{
process_encryption_info_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_DYLD_INFO or LC_DYLD_INFO_ONLY
if ($_->{'cmd'} == 0x22 || $_->{'cmd'} == 0x80000022)
{
process_lc_dyld_info($_->{'position'}, $target, $targetbaseaddress, $counter);
}
### LC_RPATH
if ($_->{'cmd'} == 0x8000001c)
{
process_rpath_command($_->{'position'}, $target, $targetbaseaddress, $counter);
}
$counter++;
}
}
}
sub process_lc_segment
{
my $counter, $x;
my $buffer="";
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
# we know it's a LC_SEGMENT so we must read it and see if we can find out __TEXT segment and __text,__TEXT section
sysseek(FILE, $position+8, 0);
# 32 bits
#struct segment_command @ /usr/include/mach-o/loader.h
#{
# uint32_t cmd;
# uint32_t cmdsize;
# char segname[16];
# uint32_t vmaddr;
# uint32_t vmsize;
# uint32_t fileoff;
# uint32_t filesize;
# vm_prot_t maxprot;
# vm_prot_t initprot;
# uint32_t nsects;
# uint32_t flags;
#};
# Total Size: 8+48 bytes
# 64 bits
#struct segment_command_64 { /* for 64-bit architectures */
# uint32_t cmd; /* LC_SEGMENT_64 */
# uint32_t cmdsize; /* includes sizeof section_64 structs */
# char segname[16]; /* segment name */
# uint64_t vmaddr; /* memory address of this segment */
# uint64_t vmsize; /* memory size of this segment */
# uint64_t fileoff; /* file offset of this segment */
# uint64_t filesize; /* amount to map from the file */
# vm_prot_t maxprot; /* maximum VM protection */
# vm_prot_t initprot; /* initial VM protection */
# uint32_t nsects; /* number of sections in segment */
# uint32_t flags; /* flags */
#};
# Total Size: 8+64 bytes
sysread(FILE, $buffer, 48) if ($target eq "x86" || $target eq "ppc" || $target eq "arm");
sysread(FILE, $buffer, 64) if ($target eq "x86_64");
($segname, $vmaddr, $vmsize, $fileoff, $filesize, $maxprot, $initprot, $nsects, $flags) = unpack("Z16LLLLLLLL", $buffer) if ($target eq "x86" || $target =~ /arm/);
($segname, $vmaddr, $vmsize, $fileoff, $filesize, $maxprot, $initprot, $nsects, $flags) = unpack("Z16NNNNNNNN", $buffer) if ($target eq "ppc");
($segname, $vmaddr, $vmsize, $fileoff, $filesize, $maxprot, $initprot, $nsects, $flags) = unpack("Z16QQQQLLLL", $buffer) if ($target eq "x86_64");
# printf("Segment Name: %s Number of sections: %i \n", $segname, $nsects) if $debug;
printf("${bold}segment name:${normal} %s [offset: 0x%08x]\n", $segname, $position+8);
if ($target eq "x86" || $target eq "ppc" || $target =~ /arm/)
{
printf("${bold}memory address:${normal} 0x%08x [offset: 0x%08x]\n", $vmaddr, $position+=24);
printf("${bold}memory size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $vmsize, $vmsize, $position+=4);
printf("${bold}file offset:${normal} 0x%08x [offset: 0x%08x]\n", $fileoff, $position+=4);
printf("${bold}file size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $filesize, $filesize, $position+=4);
printf("${bold}max prot:${normal} 0x%08x [offset: 0x%08x]\n", $maxprot, $position+=4);
printf("${bold}init prot:${normal} 0x%08x [offset: 0x%08x]\n", $initprot, $position+=4);
printf("${bold}number of sections:${normal} %d [offset: 0x%08x]\n", $nsects, $position+=4);
# TODO: add descriptions from the include
printf("${bold}flags:${normal} 0x%x [offset: 0x%08x]\n", $flags, $position+=4);
}
elsif ($target eq "x86_64")
{
printf("${bold}memory address:${normal} 0x%016llx [offset: 0x%08x]\n", $vmaddr, $position+=24);
printf("${bold}memory size:${normal} %lld bytes (0x%016llx) [offset: 0x%08x]\n", $vmsize, $vmsize, $position+=8);
printf("${bold}file offset:${normal} 0x%016llx [offset: 0x%08x]\n", $fileoff, $position+=8);
printf("${bold}file size:${normal} %lld bytes (0x%016llx) [offset: 0x%08x]\n", $filesize, $filesize, $position+=8);
printf("${bold}max prot:${normal} 0x%08x [offset: 0x%08x]\n", $maxprot, $position+=8);
printf("${bold}init prot:${normal} 0x%08x [offset: 0x%08x]\n", $initprot, $position+=4);
printf("${bold}number of sections:${normal} %d [offset: 0x%08x]\n", $nsects, $position+=4);
# TODO: add descriptions from the include
printf("${bold}flags:${normal} 0x%x [offset: 0x%08x]\n", $flags, $position+=4);
}
$currentposition = sysseek(FILE, 0,1);
# we are interested in further reading if the number of sections is more than 1.
if ($nsects > 0)
{
my $counter = 0;
for ($x=0; $x < $nsects; $x++)
{
my $buffer = "";
# printf("[Section %d]\n", $counter);
printf("\n--( SECTION #%d )--------------------------( LOAD CMD #%d )--\n", $counter, $loadcommandnumber);
#struct section { /* for 32-bit architectures */
# char sectname[16]; /* name of this section */
# char segname[16]; /* segment this section goes in */
# uint32_t addr; /* memory address of this section */
# uint32_t size; /* size in bytes of this section */
# uint32_t offset; /* file offset of this section */
# uint32_t align; /* section alignment (power of 2) */
# uint32_t reloff; /* file offset of relocation entries */
# uint32_t nreloc; /* number of relocation entries */
# uint32_t flags; /* flags (section type and attributes)*/
# uint32_t reserved1; /* reserved (for offset or index) */
# uint32_t reserved2; /* reserved (for count or sizeof) */
#};
# Total size: 16 + 16 + 9*4 = 68 bytes
#struct section_64 { /* for 64-bit architectures */
# char sectname[16]; /* name of this section */
# char segname[16]; /* segment this section goes in */
# uint64_t addr; /* memory address of this section */
# uint64_t size; /* size in bytes of this section */
# uint32_t offset; /* file offset of this section */
# uint32_t align; /* section alignment (power of 2) */
# uint32_t reloff; /* file offset of relocation entries */
# uint32_t nreloc; /* number of relocation entries */
# uint32_t flags; /* flags (section type and attributes)*/
# uint32_t reserved1; /* reserved (for offset or index) */
# uint32_t reserved2; /* reserved (for count or sizeof) */
# uint32_t reserved3; /* reserved */
#};
#Total size: 32 + 16 + 8*4 = 80 bytes
# read sectname, segname, addr, size, offset
sysread(FILE, $buffer, 68) if ($target eq "x86" || $target eq "ppc" || $target =~ /arm/);
sysread(FILE, $buffer, 80) if ($target eq "x86_64");
($sectname, $segname, $addr, $size, $offset, $align, $reloff, $nreloc, $flags, $reserved1, $reserved2) = unpack("Z16Z16LLLLLLLLL", $buffer) if ($target eq "x86" || $target =~ /arm/);
($sectname, $segname, $addr, $size, $offset, $align, $reloff, $nreloc, $flags, $reserved1, $reserved2) = unpack("Z16Z16NNNNNNNNN", $buffer) if ($target eq "ppc");
($sectname, $segname, $addr, $size, $offset, $align, $reloff, $nreloc, $flags, $reserved1, $reserved2, $reserved3) = unpack("Z16Z16QQLLLLLLLL", $buffer) if ($target eq "x86_64");
if ($target eq "x86" || $target eq "ppc" || $target =~ /arm/)
{
printf("${bold}section name:${normal} %s [offset: 0x%08x]\n", $sectname, $currentposition);
printf("${bold}segment name:${normal} %s [offset: 0x%08x]\n", $segname, $currentposition+=16);
printf("${bold}memory address:${normal} 0x%08x [offset: 0x%08x]\n", $addr, $currentposition+=16);
printf("${bold}section size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $size, $size, $currentposition+=4);
printf("${bold}file offset:${normal} 0x%08x ${bold}real file offset:${normal} 0x%08x [offset: 0x%08x]\n", $offset, $targetbaseaddress+$offset, $currentposition+=4);
printf("${bold}section alignment:${normal} 2^%d (%d) [offset: 0x%08x]\n", $align, 2**$align, $currentposition+=4);
printf("${bold}relocation entries offset:${normal} 0x%08x [offset: 0x%08x]\n", $reloff, $currentposition+=4);
printf("${bold}number of relocation entries:${normal} %d [offset: 0x%08x]\n", nreloc, $currentposition+=4);
printf("${bold}flags:${normal} 0x%08x [offset: 0x%08x]\n", $flags, $currentposition+=4);
printf("${bold}section type:${normal} %s\n", $sectiontypeconstants{$flags & 0xFF});
# TODO: interpretation of reserved flags
printf("${bold}reserved1:${normal} 0x%08x [offset: 0x%08x]\n", $reserved1, $currentposition+=4);
printf("${bold}reserved2:${normal} 0x%08x [offset: 0x%08x]\n", $reserved2, $currentposition+=4);
$currentposition += 4;
}
elsif ($target eq "x86_64")
{
printf("${bold}section name:${normal} %s [offset: 0x%08x]\n", $sectname, $currentposition);
printf("${bold}segment name:${normal} %s [offset: 0x%08x]\n", $segname, $currentposition+=16);
printf("${bold}memory address:${normal} 0x%016llx [offset: 0x%08x]\n", $addr, $currentposition+=16);
printf("${bold}section size:${normal} %lld bytes (0x%016llx) [offset: 0x%08x]\n", $size, $size, $currentposition+=8);
printf("${bold}file offset:${normal} 0x%08x ${bold}real file offset:${normal} 0x%08x [offset: 0x%08x]\n", $offset, $targetbaseaddress+$offset, $currentposition+=8);
printf("${bold}section alignment:${normal} 2^%d (%d) [offset: 0x%08x]\n", $align, 2**$align, $currentposition+=4);
printf("${bold}relocation entries offset:${normal} 0x%08x [offset: 0x%08x]\n", $reloff, $currentposition+=4);
printf("${bold}number of relocation entries:${normal} %d [offset: 0x%08x]\n", nreloc, $currentposition+=4);
printf("${bold}flags:${normal} 0x%08x [offset: 0x%08x]\n", $flags, $currentposition+=4);
printf("${bold}section type:${normal} %s\n", $sectiontypeconstants{$flags & 0xFF});
# TODO: interpretation of reserved flags
printf("${bold}reserved1:${normal} 0x%08x [offset: 0x%08x]\n", $reserved1, $currentposition+=4);
printf("${bold}reserved2:${normal} 0x%08x [offset: 0x%08x]\n", $reserved2, $currentposition+=4);
printf("${bold}reserved3:${normal} 0x%08x [offset: 0x%08x]\n", $reserved3, $currentposition+=4);
$currentposition += 4;
}
$counter++;
}
}
}
### LC_SYMTAB
sub process_lc_symtab
{
my $buffer="";
my $symoff, $nsyms, $stroff, $strsize;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct symtab_command {
# uint32_t cmd; /* LC_SYMTAB */
# uint32_t cmdsize; /* sizeof(struct symtab_command) */
# uint32_t symoff; /* symbol table offset */
# uint32_t nsyms; /* number of symbol table entries */
# uint32_t stroff; /* string table offset */
# uint32_t strsize; /* string table size in bytes */
#};
# Total Size: 8 + 4*4 = 24 bytes
sysseek(FILE, $position+8, 0);
sysread(FILE, $buffer, 16);
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLLL" } else { $unpackstring = "NNNN" };
($symoff, $nsyms, $stroff, $strsize) = unpack($unpackstring, $buffer);
printf("${bold}symbol table offset:${normal} 0x%08x [offset: 0x%08x]\n", $symoff, $position+=8);
printf("${bold}number of symtol table entries:${normal} %d [offset: 0x%08x]\n", $nsyms, $position+=4);
printf("${bold}string table offset:${normal} 0x%08x [offset: 0x%08x]\n", $stroff, $position+=4);
printf("${bold}string table size:${normal} %d bytes 0x%08x [offset: 0x%08x]\n", $strsize, $strsize, $positon+=4);
}
### LC_DYLD_INFO or LC_DYLD_INFO_ONLY
sub process_lc_dyld_info
{
my $buffer="";
my $rebase_off, $rebase_size, $bind_off, $bind_size, $weak_bind_off, $weak_bind_size, $lazy_bind_off, $lazy_bind_size, $export_off, $export_size;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct dyld_info_command {
# uint32_t cmd; /* LC_DYLD_INFO or LC_DYLD_INFO_ONLY */
# uint32_t cmdsize; /* sizeof(struct dyld_info_command) */
# uint32_t rebase_off; /* file offset to rebase info */
# uint32_t rebase_size; /* size of rebase info */
# uint32_t bind_off; /* file offset to binding info */
# uint32_t bind_size; /* size of binding info */
# uint32_t weak_bind_off; /* file offset to weak binding info */
# uint32_t weak_bind_size; /* size of weak binding info */
# uint32_t lazy_bind_off; /* file offset to lazy binding info */
# uint32_t lazy_bind_size; /* size of lazy binding infs */
# uint32_t export_off; /* file offset to lazy binding info */
# uint32_t export_size; /* size of lazy binding infs */
#};
# Total Size: 8 + 10*4 = 48 bytes
sysseek(FILE, $position+8, 0);
sysread(FILE, $buffer, 40);
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLLLLLLLLL" } else { $unpackstring = "NNNNNNNNNN" };
($rebase_off, $rebase_size, $bind_off, $bind_size, $weak_bind_off, $weak_bind_size, $lazy_bind_off, $lazy_bind_size, $export_off, $export_size) = unpack($unpackstring, $buffer);
printf("${bold}rebase offset:${normal} 0x%08x ${bold}real offset:${normal} 0x%08x [offset: 0x%08x]\n", $rebase_off, $targetbaseaddress+$rebase_off, $position+=8 );
printf("${bold}rebase size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $rebase_size, $rebase_size, $positon+=4);
printf("${bold}binding offset:${normal} 0x%08x ${bold}real offset:${normal} 0x%08x [offset: 0x%08x]\n", $bind_off, $targetbaseaddress+$bind_off, $position+=4);
printf("${bold}binding size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $bind_size, $bind_size, $positon+=4);
printf("${bold}weak binding offset:${normal} 0x%08x ${bold}real offset:${normal} 0x%08x [offset: 0x%08x]\n", $weak_bind_off, $targetbaseaddress+$weak_bind_off, $position+=4);
printf("${bold}weak binding size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $weak_bind_size, $weak_bind_size, $positon+=4);
printf("${bold}lazy binding offset:${normal} 0x%08x ${bold}real offset:${normal} 0x%08x [offset: 0x%08x]\n", $lazy_bind_off, $targetbaseaddress+$lazy_bind_off, $positon+=4);
printf("${bold}lazy binding size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $lazy_bind_size, $lazy_bind_size, $positon+=4);
printf("${bold}export offset:${normal} 0x%08x ${bold}real offset:${normal} 0x%08x [offset: 0x%08x]\n", $export_off, $targetbaseaddress+$export_off, $positon+=4);
printf("${bold}export size:${normal} %d bytes (0x%08x) [offset: 0x%08x]\n", $export_size, $export_size, $positon+=4);
}
### LC_ID_DYLINKER or LC_LOAD_DYLINKER
sub process_lc_load_dylinker
{
my $buffer="";
my $cmd, $cmdsize, $offset, $name, $sizetoread;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct dylinker_command {
# uint32_t cmd; /* LC_ID_DYLINKER or LC_LOAD_DYLINKER */
# uint32_t cmdsize; /* includes pathname string */
# union lc_str name; /* dynamic linker's path name */
#};
# Total Size: 8 + variable size string =
sysseek(FILE, $position, 0);
sysread(FILE, $buffer, 12);
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLL" } else { $unpackstring = "NNN" };
($cmd, $cmdsize, $offset) = unpack($unpackstring, $buffer);
$sizetoread = $cmdsize - 12;
sysseek(FILE, $position+12, 0);
sysread(FILE, $buffer, $sizetoread);
($name) = unpack("Z$sizetoread", $buffer);
printf("${bold}dynamic linker path name:${normal} %s [offset: 0x%08x]\n", $name, $position+12 );
}
### LC_DYSYMTAB
sub process_lc_dysymtab
{
my $buffer="";
my $ilocalsym, $nlocalsym, $iextdefsym, $nextdefsym, $iundefsym, $nundefsym, $tocoff, $ntoc, $modtaboff, $nmodtab, $extrefsymoff, $nextrefsyms, $indirectsymoff, $nindirectsyms, $extreloff, $nextrel, $locreloff, $nlocrel;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct dysymtab_command {
# uint32_t cmd; /* LC_DYSYMTAB */
# uint32_t cmdsize; /* sizeof(struct dysymtab_command) */
# uint32_t ilocalsym; /* index to local symbols */
# uint32_t nlocalsym; /* number of local symbols */
# uint32_t iextdefsym;/* index to externally defined symbols */
# uint32_t nextdefsym;/* number of externally defined symbols */
# uint32_t iundefsym; /* index to undefined symbols */
# uint32_t nundefsym; /* number of undefined symbols */
# uint32_t tocoff; /* file offset to table of contents */
# uint32_t ntoc; /* number of entries in table of contents */
# uint32_t modtaboff; /* file offset to module table */
# uint32_t nmodtab; /* number of module table entries */
# uint32_t extrefsymoff; /* offset to referenced symbol table */
# uint32_t nextrefsyms; /* number of referenced symbol table entries */
# uint32_t indirectsymoff; /* file offset to the indirect symbol table */
# uint32_t nindirectsyms; /* number of indirect symbol table entries */
# uint32_t extreloff; /* offset to external relocation entries */
# uint32_t nextrel; /* number of external relocation entries */
# uint32_t locreloff; /* offset to local relocation entries */
# uint32_t nlocrel; /* number of local relocation entries */
#};
# Total Size: 8 + 18*4 = 80 bytes
sysseek(FILE, $position+8, 0);
sysread(FILE, $buffer, 72);
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLLLLLLLLLLLLLLLLL" } else { $unpackstring = "NNNNNNNNNNNNNNNNNN" };
($ilocalsym, $nlocalsym, $iextdefsym, $nextdefsym, $iundefsym, $nundefsym, $tocoff, $ntoc, $modtaboff, $nmodtab, $extrefsymoff, $nextrefsyms, $indirectsymoff, $nindirectsyms, $extreloff, $nextrel, $locreloff, $nlocrel) = unpack($unpackstring, $buffer);
printf("${bold}index to local symbols:${normal} 0x%08x [offset: 0x%08x]\n", $ilocalsym , $position+=8 );
printf("${bold}number of local symbols:${normal} %d [offset: 0x%08x]\n", $nlocalsym, $position+=4 );
printf("${bold}index to externally defined symbols:${normal} 0x%08x [offset: 0x%08x]\n", $iextdefsym, $position+=4 );
printf("${bold}number of externally defined symbols:${normal} %d [offset: 0x%08x]\n", $nextdefsym, $position+=4 );
printf("${bold}index to undefined symbols:${normal} 0x%08x [offset: 0x%08x]\n", $iundefsym, $position+=4 );
printf("${bold}number of undefined symbols:${normal} %d [offset: 0x%08x]\n", $nundefsym, $position+=4 );
printf("${bold}file offset to table of contents:${normal} 0x%08x [offset: 0x%08x]\n", $tocoff, $position+=4 );
printf("${bold}number of entries in toc:${normal} %d [offset: 0x%08x]\n", $ntoc, $position+=4 );
printf("${bold}file offset to module table:${normal} 0x%08x [offset: 0x%08x]\n", $modtaboff, $position+=4 );
printf("${bold}number of module table entries:${normal} %d [offset: 0x%08x]\n", $nmodtab, $position+=4 );
printf("${bold}offset to referenced symbol table:${normal} 0x%08x [offset: 0x%08x]\n", $extrefsymoff, $position+=4 );
printf("${bold}number of referenced symbol table entries:${normal} %d [offset: 0x%08x]\n", $nextrefsyms, $position+=4 );
printf("${bold}file offset to the indirect symbol table:${normal} 0x%08x [offset: 0x%08x]\n", $indirectsymoff, $position+=4 );
printf("${bold}number of indirect symbol table entries:${normal} %d [offset: 0x%08x]\n", $nindirectsyms, $position+=4 );
printf("${bold}offset to external relocation entries:${normal} 0x%08x [offset: 0x%08x]\n", $extreloff, $position+=4 );
printf("${bold}number of external relocation entries:${normal} %d [offset: 0x%08x]\n", $nextrel, $position+=4 );
printf("${bold}offset to local relocation entries:${normal} 0x%08x [offset: 0x%08x]\n", $locreloff, $position+=4 );
printf("${bold}number of local relocation entries:${normal} %d [offset: 0x%08x]\n", $nlocrel, $position+=4 );
}
### LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB
sub process_dylib_command
{
my $buffer="";
my $cmd, $cmdsize, $offset, $name, $timestamp, $current_version, $compatibility_version;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct dylib_command {
# uint32_t cmd; /* LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB,
# uint32_t cmdsize; /* includes pathname string */
# struct dylib dylib; /* the library identification */
#};
# Total Size: 8 + 4 + string size + 3*4
#struct dylib {
# union lc_str name; /* library's path name */
# uint32_t timestamp; /* library's build time stamp */
# uint32_t current_version; /* library's current version number */
# uint32_t compatibility_version; /* library's compatibility vers number*/
#};
#union lc_str {
# uint32_t offset; /* offset to the string */
##ifndef __LP64__
# char *ptr; /* pointer to the string */
##endif
#};
sysseek(FILE, $position, 0);
sysread(FILE, $buffer, 12);
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLL" } else { $unpackstring = "NNN" };
($cmd, $cmdsize, $offset) = unpack($unpackstring, $buffer);
$sizetoread = $cmdsize - 12 - 12;
$buffer = "";
sysseek(FILE, $position+12, 0);
# read string plus the other fields of dylib struct
sysread(FILE, $buffer, $sizetoread+12);
# name is last since it is stored that way in the file
if ($target eq "x86" || $target eq "x86_64" || $target eq "arm") { $unpackstring = "LLLZ$sizetoread" } else { $unpackstring = "NNNZ$sizetoread" };
($timestamp, $current_version, $compatibility_version, $name) = unpack($unpackstring, $buffer);
printf("${bold}library path name:${normal} %s [offset: 0x%08x]\n", $name, $position+24 );
printf("${bold}timestamp:${normal} %s [offset: 0x%08x]\n", ctime($timestamp), $position+=12 );
printf("${bold}current version number:${normal} %d.%d.%d [offset: 0x%08x]\n", $current_version >> 16, ($current_version >> 8) & 0xff, $current_version & 0xff, $position+=4 );
printf("${bold}compatibility version:${normal} %d.%d.%d [offset: 0x%08x]\n", $compatibility_version >> 16, ($compatibility_version >> 8) & 0xff, $compatibility_version & 0xff, $position+=4 );
}
### LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO
sub process_linkedit_data_command
{
my $buffer="";
my $dataoff, $datasize;
my ($position, $target, $targetbaseaddress, $loadcommandnumber) = @_;
#struct linkedit_data_command {
# uint32_t cmd; /* LC_CODE_SIGNATURE or LC_SEGMENT_SPLIT_INFO */
# uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
# uint32_t dataoff; /* file offset of data in __LINKEDIT segment */