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<?php
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	require_once("config.inc");
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	require_once("functions.inc");
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	/* MiniUPnPd */
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	define('UPNP_RCFILE', '/usr/local/etc/rc.d/miniupnpd.sh');
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	define('UPNP_CONFIG','/usr/local/etc/miniupnpd.conf');
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	function upnp_notice ($msg) { syslog(LOG_NOTICE, "miniupnpd: {$msg}"); return; }
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	function upnp_warn ($msg) { syslog(LOG_WARNING, "miniupnpd: {$msg}"); return; }
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	function upnp_action ($action) {
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		if (file_exists(UPNP_RCFILE))
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			mwexec(UPNP_RCFILE.' '.$action);
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	}
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	function upnp_running () {
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		if((int)exec("pgrep miniupnpd | wc -l") > 0)
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			return true;
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		return false;
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	}	
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	function upnp_config ($name) {
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		global $config;
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		if($config['installedpackages']['miniupnpd']['config'][0]["{$name}"])
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			return $config['installedpackages']['miniupnpd']['config'][0]["{$name}"];
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		return NULL;
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	}
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	function upnp_write_config($conf_file, $conf_text) {
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		$conf = fopen($conf_file, "w");
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		if(!$conf) {
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			upnp_warn("Could not open {$conf_file} for writing.");
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			exit;
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		}
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		fwrite($conf, $conf_text);
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		fclose($conf);	
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	}
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	function upnp_uuid() {
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		/* md5 hash of wan mac */
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		$arp = explode(' ',exec('arp -an -i '.get_real_wan_interface()));
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		$uuid = md5($arp[3]);
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		/* put uuid in correct format 8-4-4-4-12 */
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		return substr($uuid,0,8)."-".substr($uuid,9,4)."-".substr($uuid,13,4)."-".substr($uuid,17,4)."-".substr($uuid,21,12);
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	}
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	function upnp_validate_ip($ip,$check_cdir) {
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		/* validate cdir */	
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		if($check_cdir)	{
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			$ip_array = explode("/",$ip);
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			if(count($ip_array) == 2) {
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				if($ip_array[1] < 1 || $ip_array[1] > 32)
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					return false;
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			} else
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				if(count($ip_array) != 1)
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					return false;
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		} else
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			$ip_array[] = $ip;
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		/* validate ip */
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		if(!eregi("^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$", $ip_array[0]))
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			return false;
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		foreach(explode(".", $ip_array[0]) as $sub)
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			if($sub < 0 || $sub > 256)
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				return false;
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		return true;
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	}
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	function upnp_validate_port($port) {
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		foreach(explode("-", $port) as $sub)
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			if($sub < 0 || $sub > 65535)
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				return false;
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		return true;	
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	}
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	function before_form_miniupnpd($pkg) {
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		global $config;
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		config_lock();		
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		/* if shaper connection speed defined hide fields */
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		if($config['ezshaper']['step2']['download'] && $config['ezshaper']['step2']['upload']) {
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			$i=0;
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			foreach ($pkg['fields']['field'] as $field) {
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				if ($field['fieldname'] == 'download' || $field['fieldname'] == 'upload')
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					unset($pkg['fields']['field'][$i]);
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				$i++;
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			}
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		}
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		config_unlock();
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	}
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	function validate_form_miniupnpd($post, $input_errors) {
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		if($post['iface_array'])
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			foreach($post['iface_array'] as $iface)
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				if($iface == "wan")
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					$input_errors[] = 'It is a security risk to specify WAN in the \'Interface\' field';
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		if($post['overridewanip'] && !upnp_validate_ip($post['overridewanip'],false))
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			$input_errors[] = 'You must specify a valid ip address in the \'Override WAN address\' field';
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		if(($post['download'] && !$post['upload']) || ($post['upload'] && !$post['download']))
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			$input_errors[] = 'You must fill in both \'Maximum Download Speed\' and \'Maximum Upload Speed\' fields';
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		if($post['download'] && $post['download'] <= 0)
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			$input_errors[] = 'You must specify a value greater than 0 in the \'Maximum Download Speed\' field';
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		if($post['upload'] && $post['upload'] <= 0)
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			$input_errors[] = 'You must specify a value greater than 0 in the \'Maximum Upload Speed\' field';
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		/* user permissions validation */
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		for($i=1; $i<=4; $i++) {
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			if($post["permuser{$i}"]) {
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				$perm = explode(' ',$post["permuser{$i}"]);
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				/* should explode to 4 args */
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				if(count($perm) != 4) {
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					$input_errors[] = "You must follow the specified format in the 'User specified permissions {$i}' field";
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				} else {
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					/* must with allow or deny */
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					if(!($perm[0] == 'allow' || $perm[0] == 'deny'))
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						$input_errors[] = "You must begin with allow or deny in the 'User specified permissions {$i}' field";
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					/* verify port or port range */
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					if(!upnp_validate_port($perm[1]) || !upnp_validate_port($perm[3]))
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						$input_errors[] = "You must specify a port or port range between 0 and 65535 in the 'User specified
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							permissions {$i}' field";
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					/* verify ip address */
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					if(!upnp_validate_ip($perm[2],true))
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						$input_errors[] = "You must specify a valid ip address in the 'User specified permissions {$i}' field";
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				}
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			}
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		}		
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	}
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	function sync_package_miniupnpd() {
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		global $config;
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		global $input_errors;
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		config_lock();	
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		$configtext = "ext_ifname=".get_real_wan_interface()."\n";
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		$configtext .= "port=2189\n";
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		/* since config is written before this file invoked we don't need to read post data */
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		if(upnp_config('enable') && upnp_config('iface_array'))
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			$iface_array = explode(',',upnp_config('iface_array'));
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		if($iface_array) {
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			foreach($iface_array as $iface) {
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				$if = convert_friendly_interface_to_real_interface_name($iface);
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				/* above function returns iface if fail */
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				if($if!=$iface) {
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					$addr = find_interface_ip($if);
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					/* non enabled interfaces are displayed in list on miniupnpd settings page */
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					/* check that the interface has an ip address before adding parameters */
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					if($addr) {
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						$configtext .= "listening_ip={$addr}\n";
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						if(!$ifaces_active) {
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							$webgui_ip = $addr;
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							$ifaces_active = $iface;
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						} else {
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							$ifaces_active .= ", {$iface}";
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						}
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					} else {
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						upnp_warn("Interface {$iface} has no ip address, ignoring");
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					}
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				} else {
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					upnp_warn("Could not resolve real interface for {$iface}");
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				}
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			}
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			if($ifaces_active) {
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				/* override wan ip address, common for carp, etc */
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				if(upnp_config('overridewanip'))
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					$configtext .= "ext_ip=".upnp_config('overridewanip')."\n";
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				/* if shaper connection speed defined use those values */
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				if($config['ezshaper']['step2']['download'] && $config['ezshaper']['step2']['upload']) {
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					$download = $config['ezshaper']['step2']['download']*1000;
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					$upload = $config['ezshaper']['step2']['upload']*1000;
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				} else {
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					$download = upnp_config('download')*1000;
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					$upload = upnp_config('upload')*1000;
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				}
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				/* set upload and download bitrates */
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				if($download && $upload) {
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					$configtext .= "bitrate_down={$download}\n";
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					$configtext .= "bitrate_up={$upload}\n";
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				}
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				/* enable logging of packets handled by miniupnpd rules */
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				if(upnp_config('logpackets'))
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					$configtext .= "packet_log=yes\n";
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				/* enable system uptime instead of miniupnpd uptime */
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				if(upnp_config('sysuptime'))
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					$configtext .= "system_uptime=yes\n";
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				/* set webgui url */
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				if($config['system']['webgui']['protocol']) {
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					$configtext .= "presentation_url=".$config['system']['webgui']['protocol']."://{$webgui_ip}";
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					if($config['system']['webgui']['port'])
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						$configtext .= ":".$config['system']['webgui']['port'];
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					$configtext .= "/\n";
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				}
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				/* set uuid and serial */
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				$configtext .= "uuid=".upnp_uuid()."\n";
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				$configtext .= "serial=".strtoupper(substr(upnp_uuid(),0,8))."\n";
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				/* set model number */
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				$configtext .= "model_number=".exec("cat /etc/version")."\n";
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				/* upnp access restrictions */
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				for($i=1; $i<=4; $i++) {
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					if(upnp_config("permuser{$i}"))
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						$configtext .= upnp_config("permuser{$i}")."\n";
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				}
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				if(upnp_config('permdefault'))
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					$configtext .= "deny 0-65535 0.0.0.0/0 0-65535\n";
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				/* generate rc file start and stop */
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				$stop = <<<EOD
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if [ `pgrep miniupnpd | wc -l` != 0  ]; then
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		/usr/bin/killall miniupnpd
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		while [ `pgrep miniupnpd | wc -l` != 0 ]; do
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			sleep 1
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		done
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	fi
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	# Clear existing rules and rdr entries
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	if [ `pfctl -aminiupnpd -sr | wc -l` != 0  ]; then
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		/sbin/pfctl -aminiupnpd -Fr 2>&1 >/dev/null
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	fi
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	if [ `pfctl -aminiupnpd -sn | wc -l` != 0  ]; then
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		/sbin/pfctl -aminiupnpd -Fn 2>&1 >/dev/null
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	fi
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EOD;
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				$start = $stop."\n\t/usr/local/sbin/miniupnpd -f ".UPNP_CONFIG;
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				/* write out the configuration */
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				conf_mount_rw();
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				upnp_write_config(UPNP_CONFIG,$configtext);
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				write_rcfile(array(
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					    'file' => 'miniupnpd.sh',
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					    'start' => $start,
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					    'stop' => $stop
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				    )
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				);
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				conf_mount_ro();
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				/* if miniupnpd not running start it */
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				if(!upnp_running()) {
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					upnp_notice("Starting service on interface: {$ifaces_active}");
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					upnp_action('start');	
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				}
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				/* or restart miniupnpd if settings were changed */
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				elseif($_POST['iface_array']) {
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					upnp_notice("Restarting service on interface: {$ifaces_active}");
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					upnp_action('restart');
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				}
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			}
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		}
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		if(!$iface_array || !$ifaces_active) {
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			/* no parameters user does not want miniupnpd running */
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			/* lets stop the service and remove the rc file */
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			if(file_exists(UPNP_RCFILE)) {
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				if(!upnp_config('enable'))
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					upnp_notice('Stopping service: miniupnpd disabled');
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				else
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					upnp_notice('Stopping service: no interfaces selected');
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				upnp_action('stop');
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				conf_mount_rw();
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				unlink(UPNP_RCFILE);
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				unlink(UPNP_CONFIG);
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				conf_mount_ro();
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			}
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		}
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		config_unlock();
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	}
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?>
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