<?php
/**
 *
 *  Renamed from "CHD OpenWRT" to "CHD LEDE" on 2017-06-21
 *
 *  Copyright 2016-2017 Ludovic Pouzenc <ludovic@pouzenc.fr>
 *  Copyright 2017 Nicolas Goaziou <mail@nicolasgoaziou.fr>
 * 
 *  CHD LEDE is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  CHD LEDE is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with CHD LEDE.  If not, see <http://www.gnu.org/licenses/>.
**/

function validate($regex, $index, $message, &$errors) {     
	if (isset($_POST[$index]) && 1 === preg_match($regex, $_POST[$index])) {
		return true;            
	}
	if (is_array($errors)) $errors[$index] = $message . ' (' . (isset($_POST[$index])?$_POST[$index]:'vide') . ')';
	return false; 
}

function checksame($index1, $index2, $message, &$errors) {     
	if (
		isset($_POST[$index1])
		&& isset($_POST[$index2])
		&& ($_POST[$index1] === $_POST[$index2])
	) {
		return true;            
	}
	$errors[$index] = $message; 
	return false;
}
$pattern_ipv4_optionnal='/(^|((^|\.)((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]?\d))){4})$/';
$pattern_ipv4='/((^|\.)((25[0-5])|(2[0-4]\d)|(1\d\d)|([1-9]?\d))){4}$/';
$pattern_ipv6='/^(((?=.*(::))(?!.*\3.+\3))\3?|([\dA-F]{1,4}(\3|:\b|$)|\2))(?4){5}((?4){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})\z/i';
$pattern_pass6='/^[^\']{6,64}$/u';
$pattern_pass8='/^[^\']{8,64}$/u';
$pattern_ssid='/^[\w._-]{1,32}$/';
$pattern_iden='/^[\w._-]*$/';
$pattern_rev='/^\d[\d.]*$/';
$pattern_int='/^-?\d+$/';

$errors=array();
$ignore=NULL;
$res = validate($pattern_iden, 'profile', 'Profil matériel du routeur incorrect', $errors);
$res &= validate($pattern_rev, 'revision', 'Révision matérielle du routeur incorrecte', $errors);
$res &= validate($pattern_ipv4, 'ip4pub', 'Adresse IPv4 publique du routeur incorrecte', $errors);
$res &= validate($pattern_ipv4_optionnal, 'ip4wan', 'Adresse IPv4 WAN du routeur incorrecte', $errors);
$res &= validate($pattern_ipv4, 'ip4lan', 'Adresse IPv4 LAN du routeur incorrecte', $errors);
$res &= validate($pattern_ipv6, 'ip6prefix', 'Préfixe IPv6 du routeur incorrect', $errors);
//$res &= validate($pattern_ipv6, 'ip6wanll', 'Adresse IPv6 WAN Link Local incorrecte', $errors);
$res &= validate($pattern_pass6, 'pwd1', 'Mot de passe du routeur incorrect', $errors);
$res &= validate($pattern_pass6, 'pwd2', 'Mot de passe du routeur incorrect', $ignore);
$res &= validate($pattern_ssid, 'ssid', 'Nom du réseau WiFi (SSID) incorrect', $errors);
$res &= validate($pattern_pass8, 'key1', 'Mot de passe du WiFi incorrect', $errors);
$res &= validate($pattern_pass8, 'key2', 'Mot de passe du WiFi incorrect', $ignore);
$res &= validate($pattern_int, 'txpower', 'Puissance d\'émission WiFi incorrecte', $errors);
$res &= checksame('pwd1', 'pwd2', 'Les mots de passes ne correspondent pas', $errors);
$res &= checksame('key1', 'key2', 'Les mots de passes ne correspondent pas', $errors);

$region="";
switch ($_POST['profile']) {
	case 'TLWR740':
		switch($_POST['revision']) {
			case '51':
				$target="tl-wr740n-v5";
				break;
			case '4':
			case '5':
			/* case '6': # PAS TESTE, on en a pas */
				$target="tl-wr740n-v" . $_POST['revision'];
				break;
			default:
				$errors['revision'] = 'Pas de mise à jour disponible pour l\'instant (' . (isset($_POST['revision'])?$_POST[$index]:'vide') . ')';
				$res = false;
		}
		break;
	case 'TLWR841':
		switch($_POST['revision']) {
			case '9':
			case '10':
				$target="tl-wr841-v" . $_POST['revision'];
				break;
			case '11':
				$target="tl-wr841-v" . $_POST['revision'];
				$region="-eu";
				break;
			default:
				$errors['revision'] = 'Pas de mise à jour disponible pour l\'instant (' . (isset($_POST['revision'])?$_POST[$index]:'vide') . ')';
				$res = false;
		}
		break;
	default:
		$errors['profile'] = 'Pas de mise à jour disponible pour l\'instant (' . (isset($_POST[$index])?$_POST['profile']:'vide') . ')';
		$res = false;

}

$profile="DEVICE_$target";
$user_filename="mise-a-jour-routeur-$target.bin";
$gen_fileglob="bin/targets/ar71xx/generic/lede-*-ar71xx-generic-$target-squashfs-factory$region.bin";

if ( !$res ) {
	echo "<!DOCTYPE html>\n<html>\n<head>\n<meta charset=\"utf-8\" />\n</head>\n<body>\n<h2>Oops, une erreur s'est produite</h2><div>Il y a un problème avec les renseignements fournis<br><ul>\n";
	foreach ($errors as $k=>$v) {
		echo "<li>$v</li>\n";
	}
	echo '</ul><input action="action" type="button" value="Revenir au formulaire" onclick="history.go(-1);" />'."</div>\n</body>\n</html>\n";
	exit();
}

// Prevent escapeshellarg to eat UTF-8 non ASCII chars
setlocale(LC_CTYPE, "fr_FR.UTF-8");

$basepath='/var/cache/build-openwrt';
$scriptfile='build-openwrt.sh';
$lockfile='/run/lock/build-openwrt.lock';


// Escape everything and build command-line
$ip4pub=escapeshellarg($_POST['ip4pub']);
$lanip4addr=escapeshellarg($_POST['ip4lan']);
$ip6prefix=escapeshellarg($_POST['ip6prefix']);
//$wanip6ll=escapeshellarg($_POST['ip6wanll']);
$root_passwd=escapeshellarg($_POST['pwd1']);
$wireless_ssid=escapeshellarg($_POST['ssid']);
$wireless_key=escapeshellarg($_POST['key1']);
$wireless_txpower=escapeshellarg($_POST['txpower']);
$wanip4addr=escapeshellarg($_POST['ip4wan']);

# build-openwrt <profile> <ip4pub> <lanip4addr> <ip6prefix> <root_passwd> <wireless_ssid> <wireless_key> <wireless_txpower> [ip4wan]
$command=escapeshellcmd($scriptfile);
$command .= " $profile $ip4pub $lanip4addr $ip6prefix $root_passwd $wireless_ssid $wireless_key $wireless_txpower $wanip4addr 2>&1";

// Prevent multiple parallel executions of the generation part
$fh=fopen($lockfile, 'w+');
if ( ! is_resource($fh) ) {
	echo "PROBLEM opening lock file\n";
	exit();
}

if ( ! flock($fh, LOCK_EX) ) {
	echo "PROBLEM acquiring lock file\n";
	exit();
}

// Run the imagebuilder make command
putenv("CACHE_DIR=$basepath/");
putenv("BUILD_DIR=$basepath/build/");
exec($command, $output, $return_val);

// Match produced file against expected filename
$gen_matchedfiles = glob("$basepath/build/$gen_fileglob");

// Dump script output in /tmp for troobleshooting
file_put_contents(tempnam('/tmp' , $scriptfile.'_'), array($command, "\n", print_r($output,true), "\n",$return_val,"\n"));
if ( $return_val === 0 && count($gen_matchedfiles) === 1) {
	header('Content-Type: application/octet-stream');
	header("Content-Disposition: attachment; filename=$user_filename");
	readfile($gen_matchedfiles[0]);
} else {
	echo "<pre>\n$command\n\n";
	echo join($output, "\n") . "\n\n";
	echo "Expected file pattern : '$basepath/build/$gen_fileglob'"; echo "\n";
	echo "Matched files : "; print_r($gen_matchedfiles); echo "\n";
	echo "Command return value : "; var_dump($return_val); echo "\n";
}

fclose($fh);