Code Examples -> ElfReader: An ELF (Executable and Linking Format) header information in PHP. Shows how to use the UNPACK function to read data.

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PHP Code Examples

Title :	ElfReader: An ELF (Executable and Linking Format) header information in PHP. Shows how to use the UNPACK function to read data.
Categories :	PHP, Linux, PHP Classes	Víctor Román Archidona
Date :	Jul 09th 2007
Grade :	4 of 5 (graded 1 times)
Viewed :	6663
File :	4670.zip
Images :	No Images for this code example.

Search :	More code by Víctor Román Archidona
Action :	Grade This Code Example
Tools :	My Examples List

Code


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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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