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handler.php
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handler.php
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<?php
error_reporting(0);
// $filename: Path to debian package of which the control information is to be retrieved
function GetPkgInfo($filename)
{
// Open file
if (($ar = fopen($filename, "rb")) === false)
return false;
$ar_stat = fstat($ar);
// Check for the magic ASCII string
if (($magic = fread($ar, 8)) === false)
{
fclose($ar);
return false;
}
$magic = unpack("a8", $magic);
if (strcmp("!<arch>\n", $magic[1]))
{
fclose($ar);
return false;
}
// Start reading file headers
// Ar-File headers are 60 bytes in size
while (($file_header_string = fread($ar, 60)) !== false)
{
$file_header = unpack("A16name/A12timestamp/A6owner/A6group/A8mode/A10size/C2magic", $file_header_string);
// Check for the file magic number
if ($file_header['magic1'] != 0x60 || $file_header['magic2'] != 0x0A)
// Assume the file is damaged
{
fclose($ar);
return false;
}
// Check if the file name is control.tar or control.tar.gz
// control.tar.xz is not supported by this implementation
if (!strcmp(trim($file_header['name']), "control.tar") || !strcmp(trim($file_header['name']), "control.tar.gz"))
{
// Found the control.tar/control.tar.gz file
// Read its contents
$control_size = intval($file_header['size']);
if (($pos = ftell($ar)) === false || $pos + $control_size >= $ar_stat['size'])
{
fclose($ar);
return false;
}
$control_string = fread($ar, $control_size);
fclose($ar);
if ($control_string === false)
return false;
if (!strcasecmp($file_header['name'], "control.tar.gz"))
// control.tar.gz needs to be decoded
if (($control_string = gzinflate(substr($control_string, 10, -8))) === false)
return false;
// Extract file "./control" from tape archive
while (strlen($control_string) >= 512)
{
// Read header
$tar_header = unpack("A100name/A8mode/A8owner/A8group/A12size/A12timestamp/A8checksum/A1type/A355padding", $control_string);
// Check checksum
$control_string = substr_replace($control_string, "\x20\x20\x20\x20\x20\x20\x20\x20", 148, 8);
$calculated_sum = 0;
for ($i = 0; $i < 512; $i++)
{
$calculated_sum += ord($control_string[$i]);
}
if (intval($tar_header['checksum'], 8) != $calculated_sum)
// Assume the file is damaged
return false;
// Check if file is a normal file
if ($tar_header['type'] == 0x00 || intval($tar_header['type']) == 0)
{
// Check if filename equals "./control"
if (!strcmp(trim($tar_header['name']), "./control"))
{
// Read the control file
$size = intval($tar_header['size'], 8);
$reqfl = 512 + $size;
if ($reqfl >= strlen($control_string))
return false;
$control_string = substr($control_string, 512, $size);
$control_fields = explode("\n", $control_string);
$control = array();
foreach ($control_fields as $field) {
if (!strlen($field))
continue;
$tmp = explode(":", $field, 2);
$control[$tmp[0]] = trim($tmp[1]);
}
// Check if basic package information (id and version) is available
if (!isset($control['Package']) || !isset($control['Version']))
return false;
// Add size of debian package
$control['Size'] = $ar_stat['size'];
$control['MD5sum'] = md5_file($filename);
if ($control['MD5sum'] === false)
return false;
$control["Filename"] = $filename;
return $control;
}
}
// Skip until next file
$bytes = 512 + intval($tar_header['size'], 8);
$padding = $bytes % 512;
$padding = !$padding ? $padding : 512 - $padding;
$bytes += $padding;
if ($bytes >= strlen($control_string))
return false;
$control_string = substr($control_string, $bytes);
}
}
// Seek to the next file header
$file_size = intval($file_header['size']);
if ($file_size & 0x1)
$file_size++;
if (($pos = ftell($ar)) === false || $pos + $file_size >= $ar_stat['size'])
return false;
fseek($ar, $file_size, SEEK_CUR);
}
fclose($ar);
return false;
}
function CompareVersionNumber($ver1, $ver2)
{
for ($i = 0, $vl1 = strlen($ver1), $vl2 = strlen($ver2); $i < $vl1 && $i < $vl2; $i++)
{
$val1 = ord($ver1[$i]);
$val2 = ord($ver2[$i]);
if ($ver1[$i] == '~')
$val1 = 0;
if ($ver2[$i] == '~')
$val2 = 0;
if (!ctype_alnum($ver1[$i]))
$val1 += 0xFF;
if (!ctype_alnum($ver2[$i]))
$val2 += 0xFF;
if ($val1 > $val2)
return 1;
else if ($val1 < $val2)
return -1;
}
return 0;
}
// $ver1: First version number
// $ver2: Second version number
// returns: -1 if $ver1 < $ver2
// 0 if $ver1 == $ver2
// 1 if $ver1 > $ver2
function CompareVersions($ver1, $ver2)
{
// Prepare associative arrays for version numbers
$version1 = array("epoch" => 0, "debian_revision" => "", "upstream_version" => $ver1);
$version2 = array("epoch" => 0, "debian_revision" => "", "upstream_version" => $ver2);
// split version into epoch, upstream_version and debian_revision
// Retrieve epoch
$epoch = explode(":", $ver1, 2);
if (count($epoch) == 2)
{
$version1['epoch'] = intval($epoch[0]);
$version1['upstream_version'] = $epoch[1];
}
$epoch = explode(":", $ver2, 2);
if (count($epoch) == 2)
{
$version2['epoch'] = intval($epoch[0]);
$version2['upstream_version'] = $epoch[1];
}
// Compare epoch
if ($version1['epoch'] > $version2['epoch'])
return 1;
else if ($version1['epoch'] < $version2['epoch'])
return -1;
// Retrieve debian_revision
$version1['debian_revision'] = strrchr($ver1, "-");
if ($version1['debian_revision'] === false)
$version1['debian_revision'] = "";
$version2['debian_revision'] = strrchr($ver2, "-");
if ($version2['debian_revision'] === false)
$version2['debian_revision'] = "";
// Retrieve upstream version
$rev_pos = strrpos($version1['upstream_version'], "-");
if ($rev_pos !== false)
$version1['upstream_version'] = substr($version1['upstream_version'], 0, $rev_pos);
$rev_pos = strrpos($version2['upstream_version'], "-");
if ($rev_pos !== false)
$version2['upstream_version'] = substr($version2['upstream_version'], 0, $rev_pos);
// Compare upstream version
$cmpres = CompareVersionNumber($version1['upstream_version'], $version2['upstream_version']);
if ($cmpres)
return $cmpres;
// Compare debian revision
$cmpres = CompareVersionNumber($version1['debian_revision'], $version2['debian_revision']);
return $cmpres;
}
// $dir: Directory to search for debian packages
function GeneratePackages($dir)
{
if (($debs = glob($dir . "/*.deb")) === false)
return false;
$packages = array();
foreach ($debs as $deb) {
if (($control = GetPkgInfo($deb)) === false)
continue;
if (!isset($packages[$control['Package']]))
$packages[$control['Package']] = $control;
else
// Compare version numbers
if (CompareVersions($control['Version'], $packages[$control['Package']]['Version']) > 0)
$packages[$control['Package']] = $control;
}
$packages_string = "";
foreach ($packages as $info)
{
foreach ($info as $fieldname => $value)
$packages_string .= $fieldname . ": " . $value . "\n";
$packages_string .= "\n";
}
return $packages_string;
}
// Generate new Packages.bz2 if Packages.bz2 does not exist or if the time of the last modification was
// before the time of the last modification of the debs-Directory
$size = 0;
if (!($exists = file_exists("Packages.bz2")) || ($size = filesize("Packages.bz2")) === false || ($pbz2mtime = filemtime("Packages.bz2")) === false || ($debsmtime = filemtime("debs/.")) === false || $pbz2mtime < $debsmtime)
{
// Return the old or a fake Packages.bz2
ob_end_clean();
header("Connection: close");
ignore_user_abort(1);
ob_start();
header("Content-Type: application/x-bzip2");
header("Content-Disposition: filename=\"Packages.bz2\"");
if ($exists && $size !== false) {
readfile("Packages.bz2");
header("Content-Length: " . $size);
} else {
$fakepkg = bzcompress("");
echo $fakepkg;
header("Content-Length: " . strlen($fakepkg));
}
ob_end_flush();
flush();
session_write_close();
// Generate new Packages.bz2
// Exit if the Packages.bz2 file is locked by another instance of this script
if (file_exists("Packages.lock"))
exit();
// Create lock
file_put_contents("Packages.lock", "");
// Retrieve Packages string for "debs"-Directory
$packages = GeneratePackages("debs");
if ($packages !== false)
file_put_contents("Packages.bz2", bzcompress($packages));
// Remove lock
unlink("Packages.lock");
exit();
}
// Return the current Packages.bz2
else
{
header("Content-Type: application/x-bzip2");
header("Content-Disposition: filename=\"Packages.bz2\"");
header("Content-Length: " . $size);
readfile("Packages.bz2");
}