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The file offset is stored using a class for their manageability, it stores the current offset and reads the specified bytes without making the user fight against that.
More about ELF : http://en.wikipedia.org/wiki/Executable_and_Linkable_Format
Example Usage
| <?php
/* Some files...: */
$binaries = array("/bin/bash", "/sbin/ifconfig");
/* Dumps the ELF file information: */
foreach ($binaries as $binary) {
if (!is_file($binary))
continue;
echo "Dumping information about: $binary\n";
print_r(readHeader($binary));
echo "\n";
}
function readHeader($file)
{
/* Our file management class: */
require_once "filereader.class.php";
$fr = new FileReader($file, "rb");
/* Gets the first 16 bytes (E_IDENT): */
$bytes = $fr->readBytes(16);
$magic = unpack("C16", $bytes);
/* Cheks if the file is a valid ELF file: */
if ($magic[1] != 0x7f
|| $magic[2] != ord('E')
|| $magic[3] != ord('L')
|| $magic[4] != ord('F')) {
die("Specified file is not an ELF binary");
}
/* And now reads the rest of information (~52 bytes): */
$elf_information = array(
"ei_class" => $magic[5],
"ei_data" => $magic[6],
"ei_version" => $magic[7],
"ei_osabi" => $magic[8],
"ei_abiversion" => $magic[9],
"ei_pad" => $magic[10],
"ei_nident" => $magic[16],
"e_type" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_machine" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_version" => getElementZero(unpack("I*", $fr->readBytes(4))),
"e_entry" => getElementZero(unpack("I*", $fr->readBytes(4))),
"e_phoff" => getElementZero(unpack("I*", $fr->readBytes(4))),
"e_shoff" => getElementZero(unpack("I*", $fr->readBytes(4))),
"e_flags" => getElementZero(unpack("I*", $fr->readBytes(4))),
"e_ehsize" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_phentsize" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_phnum" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_shetsize" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_shnum" => getElementZero(unpack("S*", $fr->readBytes(2))),
"e_shtrndx" => getElementZero(unpack("S*", $fr->ReadBytes(2)))
);
return $elf_information;
}
function getElementZero($where)
{
return $where[1];
}
?> | |
filereader.class.php
| <?php
class FileReader
{
private $_fh = null;
private $_offset = 0;
public function __construct($file, $mode)
{
if (is_readable($file))
$this->_fh = fopen($file, $mode);
}
public function __destruct()
{
if ($this->_fh)
fclose($this->_fh);
}
public function getOffset()
{
return $this->_offset;
}
public function readBytes($bytes)
{
if (!$this->_fh)
return null;
$read = fread($this->_fh, $bytes);
$this->_offset += $bytes;
fseek($this->_fh, $this->_offset);
return $read;
}
}
?> | |
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