<?php
/*
	gwlb.inc
	Copyright (C) 2008 Bill Marquette, Seth Mos
	Copyright (C) 2010 Ermal Luçi
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions are met:

	1. Redistributions of source code must retain the above copyright notice,
	this list of conditions and the following disclaimer.

	2. Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in the
	documentation and/or other materials provided with the distribution.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
	AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
	OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	POSSIBILITY OF SUCH DAMAGE.

	pfSense_BUILDER_BINARIES:	/sbin/route	/usr/local/sbin/apinger
	pfSense_MODULE:	routing

 */
require_once("config.inc");
require_once("rrd.inc");

/* Returns an array of default values used for apinger.conf */
function return_apinger_defaults() {
	return array(
		"latencylow" => "200",
		"latencyhigh" => "500",
		"losslow" => "10",
		"losshigh" => "20",
		"interval" => "1",
		"down" => "10",
		"avg_delay_samples" => "10",
		"avg_loss_samples" => "50",
		"avg_loss_delay_samples" => "20");
}

/*
 * Creates monitoring configuration file and
 * adds appropriate static routes.
 */
function setup_gateways_monitor() {
	global $config, $g;

	$gateways_arr = return_gateways_array();
	if (!is_array($gateways_arr)) {
		log_error("No gateways to monitor. Apinger will not be run.");
		killbypid("{$g['varrun_path']}/apinger.pid");
		@unlink("{$g['varrun_path']}/apinger.status");
		return;
	}

	$apinger_debug = "";
	if (isset($config['system']['apinger_debug'])) {
		$apinger_debug = "debug on";
	}

	$apinger_default = return_apinger_defaults();
	$apingerconfig = <<<EOD

# pfSense apinger configuration file. Automatically Generated!

{$apinger_debug}

## User and group the pinger should run as
user "root"
group "wheel"

## Mailer to use (default: "/usr/lib/sendmail -t")
#mailer "/var/qmail/bin/qmail-inject"

## Location of the pid-file (default: "/var/run/apinger.pid")
pid_file "{$g['varrun_path']}/apinger.pid"

## Format of timestamp (%s macro) (default: "%b %d %H:%M:%S")
#timestamp_format "%Y%m%d%H%M%S"

status {
	## File where the status information should be written to
	file "{$g['varrun_path']}/apinger.status"
	## Interval between file updates
	## when 0 or not set, file is written only when SIGUSR1 is received
	interval 5s
}

########################################
# RRDTool status gathering configuration
# Interval between RRD updates
rrd interval 60s;

## These parameters can be overridden in a specific alarm configuration
alarm default {
	command on "/usr/local/sbin/pfSctl -c 'service reload dyndns %T' -c 'service reload ipsecdns' -c 'service reload openvpn %T' -c 'filter reload' "
	command off "/usr/local/sbin/pfSctl -c 'service reload dyndns %T' -c 'service reload ipsecdns' -c 'service reload openvpn %T' -c 'filter reload' "
	combine 10s
}

## "Down" alarm definition.
## This alarm will be fired when target doesn't respond for 30 seconds.
alarm down "down" {
	time {$apinger_default['down']}s
}

## "Delay" alarm definition.
## This alarm will be fired when responses are delayed more than 200ms
## it will be canceled, when the delay drops below 100ms
alarm delay "delay" {
	delay_low {$apinger_default['latencylow']}ms
	delay_high {$apinger_default['latencyhigh']}ms
}

## "Loss" alarm definition.
## This alarm will be fired when packet loss goes over 20%
## it will be canceled, when the loss drops below 10%
alarm loss "loss" {
	percent_low {$apinger_default['losslow']}
	percent_high {$apinger_default['losshigh']}
}

target default {
	## How often the probe should be sent
	interval {$apinger_default['interval']}s

	## How many replies should be used to compute average delay
	## for controlling "delay" alarms
	avg_delay_samples {$apinger_default['avg_delay_samples']}

	## How many probes should be used to compute average loss
	avg_loss_samples {$apinger_default['avg_loss_samples']}

	## The delay (in samples) after which loss is computed
	## without this delays larger than interval would be treated as loss
	avg_loss_delay_samples {$apinger_default['avg_loss_delay_samples']}

	## Names of the alarms that may be generated for the target
	alarms "down","delay","loss"

	## Location of the RRD
	#rrd file "{$g['vardb_path']}/rrd/apinger-%t.rrd"
}

EOD;

	$monitor_ips = array();
	foreach ($gateways_arr as $name => $gateway) {
		/* Do not monitor if such was requested */
		if (isset($gateway['monitor_disable'])) {
			continue;
		}
		if (empty($gateway['monitor']) || !is_ipaddr($gateway['monitor'])) {
			if (is_ipaddr($gateway['gateway'])) {
				$gateway['monitor'] = $gateway['gateway'];
			} else { /* No chance to get an ip to monitor skip target. */
				continue;
			}
		}

		/* if the monitor address is already used before, skip */
		if (in_array($gateway['monitor'], $monitor_ips)) {
			continue;
		}

		/* Interface ip is needed since apinger will bind a socket to it.
		 * However the config GUI should already have checked this and when
		 * PPoE is used the IP address is set to "dynamic". So using is_ipaddrv4
		 * or is_ipaddrv6 to identify packet type would be wrong, especially as
		 * further checks (that can cope with the "dynamic" case) are present inside
		 * the if block. So using $gateway['ipprotocol'] is the better option.
		 */
		if ($gateway['ipprotocol'] == "inet") { // This is an IPv4 gateway...
			$gwifip = find_interface_ip($gateway['interface'], true);
			if (!is_ipaddrv4($gwifip)) {
				continue; //Skip this target
			}

			if ($gwifip == "0.0.0.0") {
				continue; //Skip this target - the gateway is still waiting for DHCP
			}

			/*
			 * If the gateway is the same as the monitor we do not add a
			 * route as this will break the routing table.
			 * Add static routes for each gateway with their monitor IP
			 * not strictly necessary but is a added level of protection.
			 */
			if (is_ipaddrv4($gateway['gateway']) && $gateway['monitor'] != $gateway['gateway']) {
				log_error("Removing static route for monitor {$gateway['monitor']} and adding a new route through {$gateway['gateway']}");
				if (interface_isppp_type($gateway['friendlyiface'])) {
					mwexec("/sbin/route change -host " . escapeshellarg($gateway['monitor']) .
						" -iface " . escapeshellarg($gateway['interface']), true);
				} else {
					mwexec("/sbin/route change -host " . escapeshellarg($gateway['monitor']) .
						" " . escapeshellarg($gateway['gateway']), true);
				}

				pfSense_kill_states("0.0.0.0/0", $gateway['monitor'], $gateway['interface'], "icmp");
			}
		} else if ($gateway['ipprotocol'] == "inet6") { // This is an IPv6 gateway...
			if ($gateway['monitor'] == $gateway['gateway']) {
				/* link locals really need a different src ip */
				if (is_linklocal($gateway['gateway'])) {
					if (!strpos($gateway['gateway'], '%')) {
						$gateway['gateway'] .= '%' . $gateway['interface'];
					}
					$gwifip = find_interface_ipv6_ll($gateway['interface'], true);
				} else {
					$gwifip = find_interface_ipv6($gateway['interface'], true);
				}
			} else {
				/* 'monitor' has been set, so makes sure it has precedence over
				 * 'gateway' in defining the source IP. Otherwise if 'gateway'
				 * is a local link and 'monitor' is global routable then the
				 * ICMP6 response would not find its way back home...
				 */
				$gwifip = find_interface_ipv6($gateway['interface'], true);
			}

			/* Make sure srcip and target have scope defined when they are ll */
			if (is_linklocal($gwifip) && !strpos($gwifip, '%')) {
				$gwifip .= '%' . $gateway['interface'];
			}
			if (is_linklocal($gateway['monitor']) && !strpos($gateway['monitor'], '%')) {
				$gateway['monitor'] .= "%{$gateway['interface']}";
			}

			if (!is_ipaddrv6($gwifip)) {
				continue; //Skip this target
			}

			/*
			 * If the gateway is the same as the monitor we do not add a
			 * route as this will break the routing table.
			 * Add static routes for each gateway with their monitor IP
			 * not strictly necessary but is a added level of protection.
			 */
			if ($gateway['gateway'] != $gateway['monitor']) {
				log_error("Removing static route for monitor {$gateway['monitor']} and adding a new route through {$gateway['gateway']}");
				if (interface_isppp_type($gateway['friendlyiface'])) {
					mwexec("/sbin/route change -host -inet6 " . escapeshellarg($gateway['monitor']) .
						" -iface " . escapeshellarg($gateway['interface']), true);
				} else {
					mwexec("/sbin/route change -host -inet6 " . escapeshellarg($gateway['monitor']) .
						" " . escapeshellarg($gateway['gateway']), true);
				}

				pfSense_kill_states("::0.0.0.0/0", $gateway['monitor'], $gateway['interface'], "icmpv6");
			}
		} else {
			continue;
		}

		$monitor_ips[] = $gateway['monitor'];
		$apingercfg = "target \"{$gateway['monitor']}\" {\n";
		$apingercfg .= "	description \"{$name}\"\n";
		$apingercfg .= "	srcip \"{$gwifip}\"\n";

		## How often the probe should be sent
		if (!empty($gateway['interval']) && is_numeric($gateway['interval'])) {
			$interval = intval($gateway['interval']);	# Restrict to Integer
			if ($interval < 1) {
				$interval = 1;	# Minimum
			}
			if ($interval != $apinger_default['interval']) {	# If not default value
				$apingercfg .= "	interval " . $interval . "s\n";
			}
		}

		## How many replies should be used to compute average delay
		## for controlling "delay" alarms
		if (!empty($gateway['avg_delay_samples']) && is_numeric($gateway['avg_delay_samples'])) {
			$avg_delay_samples = intval($gateway['avg_delay_samples']);	# Restrict to Integer
			if ($avg_delay_samples < 1) {
				$avg_delay_samples = 1;	# Minimum
			}
			if ($avg_delay_samples != $apinger_default['avg_delay_samples']) {	# If not default value
				$apingercfg .= "	avg_delay_samples " . $avg_delay_samples . "\n";
			}
		}

		## How many probes should be used to compute average loss
		if (!empty($gateway['avg_loss_samples']) && is_numeric($gateway['avg_loss_samples'])) {
			$avg_loss_samples = intval($gateway['avg_loss_samples']);	# Restrict to Integer
			if ($avg_loss_samples < 1) {
				$avg_loss_samples = 1;	# Minimum
			}
			if ($avg_loss_samples != $apinger_default['avg_loss_samples']) { # If not default value
				$apingercfg .= "	avg_loss_samples " . $avg_loss_samples . "\n";
			}
		}

		## The delay (in samples) after which loss is computed
		## without this delays larger than interval would be treated as loss
		if (!empty($gateway['avg_loss_delay_samples']) && is_numeric($gateway['avg_loss_delay_samples'])) {
			$avg_loss_delay_samples = intval($gateway['avg_loss_delay_samples']);	# Restrict to Integer
			if ($avg_loss_delay_samples < 1) {
				$avg_loss_delay_samples = 1;	# Minimum
			}
			if ($avg_loss_delay_samples != $apinger_default['avg_loss_delay_samples']) { # If not default value
				$apingercfg .= "	avg_loss_delay_samples " . $avg_loss_delay_samples . "\n";
			}
		}

		$alarms = "";
		$alarmscfg = "";
		$override = false;
		if (!empty($gateway['losslow'])) {
			$alarmscfg .= "alarm loss \"{$name}loss\" {\n";
			$alarmscfg .= "\tpercent_low {$gateway['losslow']}\n";
			$alarmscfg .= "\tpercent_high {$gateway['losshigh']}\n";
			$alarmscfg .= "}\n";
			$alarms .= "\"{$name}loss\"";
			$override = true;
		} else {
			if ($override == true) {
				$alarms .= ",";
			}
			$alarms .= "\"loss\"";
			$override = true;
		}
		if (!empty($gateway['latencylow'])) {
			$alarmscfg .= "alarm delay \"{$name}delay\" {\n";
			$alarmscfg .= "\tdelay_low {$gateway['latencylow']}ms\n";
			$alarmscfg .= "\tdelay_high {$gateway['latencyhigh']}ms\n";
			$alarmscfg .= "}\n";
			if ($override == true) {
				$alarms .= ",";
			}
			$alarms .= "\"{$name}delay\"";
			$override = true;
		} else {
			if ($override == true) {
				$alarms .= ",";
			}
			$alarms .= "\"delay\"";
			$override = true;
		}
		if (!empty($gateway['down'])) {
			$alarmscfg .= "alarm down \"{$name}down\" {\n";
			$alarmscfg .= "\ttime {$gateway['down']}s\n";
			$alarmscfg .= "}\n";
			if ($override == true) {
				$alarms .= ",";
			}
			$alarms .= "\"{$name}down\"";
			$override = true;
		} else {
			if ($override == true) {
				$alarms .= ",";
			}
			$alarms .= "\"down\"";
			$override = true;
		}
		if ($override == true) {
			$apingercfg .= "\talarms override {$alarms};\n";
		}

		if (isset($gateway['force_down'])) {
			$apingercfg .= "\tforce_down on\n";
		}

		$apingercfg .= "	rrd file \"{$g['vardb_path']}/rrd/{$gateway['name']}-quality.rrd\"\n";
		$apingercfg .= "}\n";
		$apingercfg .= "\n";

		$apingerconfig .= $alarmscfg;
		$apingerconfig .= $apingercfg;

		# Create gateway quality RRD with settings more suitable for pfSense graph set,
		# since apinger uses default step (300; 5 minutes) and other settings that don't
		# match the pfSense gateway quality graph set.
		create_gateway_quality_rrd("{$g['vardb_path']}/rrd/{$gateway['name']}-quality.rrd");
	}
	@file_put_contents("{$g['varetc_path']}/apinger.conf", $apingerconfig);
	unset($apingerconfig);

	/* Restart apinger process */
	if (isvalidpid("{$g['varrun_path']}/apinger.pid")) {
		sigkillbypid("{$g['varrun_path']}/apinger.pid", "HUP");
	} else {
		/* start a new apinger process */
		@unlink("{$g['varrun_path']}/apinger.status");
		sleep(1);
		mwexec_bg("/usr/local/sbin/apinger -c {$g['varetc_path']}/apinger.conf");
		sleep(1);
		sigkillbypid("{$g['varrun_path']}/apinger.pid", "USR1");
	}

	return 0;
}

/* return the status of the apinger targets as a array */
function return_gateways_status($byname = false) {
	global $config, $g;

	$apingerstatus = array();
	/* Always get the latest status from apinger */
	if (file_exists("{$g['varrun_path']}/apinger.pid")) {
		sigkillbypid("{$g['varrun_path']}/apinger.pid", "USR1");
	}
	if (file_exists("{$g['varrun_path']}/apinger.status")) {
		$apingerstatus = file("{$g['varrun_path']}/apinger.status");
	} else {
		$apingerstatus = array();
	}

	$status = array();
	foreach ($apingerstatus as $line) {
		$info = explode("|", $line);
		if ($byname == false) {
			$target = $info[0];
		} else {
			$target = $info[2];
		}

		$status[$target] = array();
		$status[$target]['monitorip'] = $info[0];
		$status[$target]['srcip'] = $info[1];
		$status[$target]['name'] = $info[2];
		$status[$target]['lastcheck'] = $info[5] ? date('r', $info[5]) : date('r');
		$status[$target]['delay'] = empty($info[6]) ? "0ms" : round($info[6], 1) ."ms" ;
		$status[$target]['loss'] = empty($info[7]) ? "0.0%" : round($info[7], 1) . "%";
		$status[$target]['status'] = trim($info[8]);
	}

	/* tack on any gateways that have monitoring disabled
	 * or are down, which could cause gateway groups to fail */
	$gateways_arr = return_gateways_array();
	foreach ($gateways_arr as $gwitem) {
		if (!isset($gwitem['monitor_disable'])) {
			continue;
		}
		if (!is_ipaddr($gwitem['monitorip'])) {
			$realif = $gwitem['interface'];
			$tgtip = get_interface_gateway($realif);
			if (!is_ipaddr($tgtip)) {
				$tgtip = "none";
			}
			$srcip = find_interface_ip($realif);
		} else {
			$tgtip = $gwitem['monitorip'];
			$srcip = find_interface_ip($realif);
		}
		if ($byname == true) {
			$target = $gwitem['name'];
		} else {
			$target = $tgtip;
		}

		/* failsafe for down interfaces */
		if ($target == "none") {
			$target = $gwitem['name'];
			$status[$target]['name'] = $gwitem['name'];
			$status[$target]['lastcheck'] = date('r');
			$status[$target]['delay'] = "0.0ms";
			$status[$target]['loss'] = "100.0%";
			$status[$target]['status'] = "down";
		} else {
			$status[$target]['monitorip'] = $tgtip;
			$status[$target]['srcip'] = $srcip;
			$status[$target]['name'] = $gwitem['name'];
			$status[$target]['lastcheck'] = date('r');
			$status[$target]['delay'] = "0.0ms";
			$status[$target]['loss'] = "0.0%";
			$status[$target]['status'] = "none";
		}
	}
	return($status);
}

/* Return all configured gateways on the system */
function return_gateways_array($disabled = false, $localhost = false, $inactive = false) {
	global $config, $g;

	$gateways_arr = array();
	$gateways_arr_temp = array();

	$found_defaultv4 = 0;
	$found_defaultv6 = 0;

	// Ensure the interface cache is up to date first
	$interfaces = get_interface_arr(true);
	$interfaces_v4 = array();
	$interfaces_v6 = array();

	$i = -1;
	/* Process/add all the configured gateways. */
	if (is_array($config['gateways']['gateway_item'])) {
		foreach ($config['gateways']['gateway_item'] as $gateway) {
			/* Increment it here to do not skip items */
			$i++;

			if (empty($config['interfaces'][$gateway['interface']])) {
				if ($inactive === false) {
					continue;
				} else {
					$gateway['inactive'] = true;
				}
			}
			$wancfg = $config['interfaces'][$gateway['interface']];

			/* skip disabled interfaces */
			if ($disabled === false && (!isset($wancfg['enable']))) {
				continue;
			}

			/* if the gateway is dynamic and we can find the IPv4, Great! */
			if (empty($gateway['gateway']) || $gateway['gateway'] == "dynamic") {
				if ($gateway['ipprotocol'] == "inet") {
					/* we know which interfaces is dynamic, this should be made a function */
					$gateway['gateway'] = get_interface_gateway($gateway['interface']);
					/* no IP address found, set to dynamic */
					if (!is_ipaddrv4($gateway['gateway'])) {
						$gateway['gateway'] = "dynamic";
					}
					$gateway['dynamic'] = true;
				}

				/* if the gateway is dynamic and we can find the IPv6, Great! */
				else if ($gateway['ipprotocol'] == "inet6") {
					/* we know which interfaces is dynamic, this should be made a function, and for v6 too */
					$gateway['gateway'] = get_interface_gateway_v6($gateway['interface']);
					/* no IPv6 address found, set to dynamic */
					if (!is_ipaddrv6($gateway['gateway'])) {
						$gateway['gateway'] = "dynamic";
					}
					$gateway['dynamic'] = true;
				}
			} else {
				/* getting this detection right is hard at this point because we still don't
				 * store the address family in the gateway item */
				if (is_ipaddrv4($gateway['gateway'])) {
					$gateway['ipprotocol'] = "inet";
				} else if (is_ipaddrv6($gateway['gateway'])) {
					$gateway['ipprotocol'] = "inet6";
				}
			}

			if (isset($gateway['monitor_disable'])) {
				$gateway['monitor_disable'] = true;
			} else if (empty($gateway['monitor'])) {
				$gateway['monitor'] = $gateway['gateway'];
			}

			$gateway['friendlyiface'] = $gateway['interface'];

			/* special treatment for tunnel interfaces */
			if ($gateway['ipprotocol'] == "inet6") {
				$gateway['interface'] = get_real_interface($gateway['interface'], "inet6", false, false);
				$interfaces_v6[$gateway['friendlyiface']] = $gateway['friendlyiface'];
			} else {
				$gateway['interface'] = get_real_interface($gateway['interface'], "all", false, false);
				$interfaces_v4[$gateway['friendlyiface']] = $gateway['friendlyiface'];
			}

			/* entry has a default flag, use it */
			if (isset($gateway['defaultgw'])) {
				if ($gateway['ipprotocol'] == "inet") {
					$gateway['defaultgw'] = true;
					$found_defaultv4 = 1;
				} else if ($gateway['ipprotocol'] == "inet6") {
					$gateway['defaultgw'] = true;
					$found_defaultv6 = 1;
				}
			}
			/* include the gateway index as the attribute */
			$gateway['attribute'] = $i;

			/* Remember all the gateway names, even ones to be skipped because they are disabled. */
			/* Then we can easily know and match them later when attempting to add dynamic gateways to the list. */
			$gateways_arr_temp[$gateway['name']] = $gateway;

			/* skip disabled gateways if the caller has not asked for them to be returned. */
			if (!($disabled === false && isset($gateway['disabled']))) {
				$gateways_arr[$gateway['name']] = $gateway;
			}
		}
	}
	unset($gateway);

	/* Loop through all interfaces with a gateway and add it to a array */
	if ($disabled == false) {
		$iflist = get_configured_interface_with_descr();
	} else {
		$iflist = get_configured_interface_with_descr(false, true);
	}

	/* Process/add dynamic v4 gateways. */
	foreach ($iflist as $ifname => $friendly) {
		if (!interface_has_gateway($ifname)) {
			continue;
		}

		if (empty($config['interfaces'][$ifname])) {
			continue;
		}

		$ifcfg = &$config['interfaces'][$ifname];
		if (!isset($ifcfg['enable'])) {
			continue;
		}

		if (!empty($ifcfg['ipaddr']) && is_ipaddrv4($ifcfg['ipaddr'])) {
			continue;
		}

		if (isset($interfaces_v4[$ifname])) {
			continue;
		}

		$ctype = "";
		switch ($ifcfg['ipaddr']) {
			case "dhcp":
			case "pppoe":
			case "pptp":
			case "ppp":
				$ctype = strtoupper($ifcfg['ipaddr']);
				break;
			default:
				$tunnelif = substr($ifcfg['if'], 0, 3);
				if (substr($ifcfg['if'], 0, 4) == "ovpn") {
					// if current iface is an ovpn server endpoint then check its type, skip tap only
					if (substr($ifcfg['if'], 4, 1) == 's') {
						$ovpnid = substr($ifcfg['if'], 5);
						if (is_array($config['openvpn']['openvpn-server'])) {
							foreach ($config['openvpn']['openvpn-server'] as & $ovpnserverconf) {
								if ($ovpnserverconf['vpnid'] == $ovpnid) {
									if ($ovpnserverconf['dev_mode'] == "tap") {
										continue 3;
									}
								}
							}
						}
					}
					$ctype = "VPNv4";
				} else if ($tunnelif == "gif" || $tunnelif == "gre") {
					$ctype = "TUNNELv4";
				}
				break;
		}
		$ctype = "_". strtoupper($ctype);

		$gateway = array();
		$gateway['dynamic'] = false;
		$gateway['ipprotocol'] = "inet";
		$gateway['gateway'] = get_interface_gateway($ifname, $gateway['dynamic']);
		$gateway['interface'] = get_real_interface($ifname);
		$gateway['friendlyiface'] = $ifname;
		$gateway['name'] = "{$friendly}{$ctype}";
		$gateway['attribute'] = "system";

		if (($gateway['dynamic'] === "default") && ($found_defaultv4 == 0)) {
			$gateway['defaultgw'] = true;
			$gateway['dynamic'] = true;
			$found_defaultv4 = 1;
		}
		/* Loopback dummy for dynamic interfaces without a IP */
		if (!is_ipaddrv4($gateway['gateway']) && $gateway['dynamic'] == true) {
			$gateway['gateway'] = "dynamic";
		}

		/* automatically skip known static and dynamic gateways that were previously processed */
		foreach ($gateways_arr_temp as $gateway_item) {
			if ((($ifname == $gateway_item['friendlyiface'] && $friendly == $gateway_item['name'])&& ($gateway['ipprotocol'] == $gateway_item['ipprotocol'])) ||
			    (($ifname == $gateway_item['friendlyiface'] && $gateway_item['dynamic'] == true) && ($gateway['ipprotocol'] == $gateway_item['ipprotocol']))) {
				continue 2;
			}
		}

		if (is_ipaddrv4($gateway['gateway'])) {
			$gateway['monitor'] = $gateway['gateway'];
		}

		$gateway['descr'] = "Interface {$friendly}{$ctype} Gateway";
		$gateways_arr[$gateway['name']] = $gateway;
	}
	unset($gateway);

	/* Process/add dynamic v6 gateways. */
	foreach ($iflist as $ifname => $friendly) {
		/* If the user has disabled IPv6, they probably don't want any IPv6 gateways. */
		if (!isset($config['system']['ipv6allow'])) {
			break;
		}

		if (!interface_has_gatewayv6($ifname)) {
			continue;
		}

		if (empty($config['interfaces'][$ifname])) {
			continue;
		}

		$ifcfg = &$config['interfaces'][$ifname];
		if (!isset($ifcfg['enable'])) {
			continue;
		}

		if (!empty($ifcfg['ipaddrv6']) && is_ipaddrv6($ifcfg['ipaddrv6'])) {
			continue;
		}

		if (isset($interfaces_v6[$ifname])) {
			continue;
		}

		$ctype = "";
		switch ($ifcfg['ipaddrv6']) {
			case "slaac":
			case "dhcp6":
			case "6to4":
			case "6rd":
				$ctype = strtoupper($ifcfg['ipaddrv6']);
				break;
			default:
				$tunnelif = substr($ifcfg['if'], 0, 3);
				if (substr($ifcfg['if'], 0, 4) == "ovpn") {
					// if current iface is an ovpn server endpoint then check its type, skip tap only
					if (substr($ifcfg['if'], 4, 1) == 's') {
						$ovpnid = substr($ifcfg['if'], 5);
						if (is_array($config['openvpn']['openvpn-server'])) {
							foreach ($config['openvpn']['openvpn-server'] as & $ovpnserverconf) {
								if ($ovpnserverconf['vpnid'] == $ovpnid) {
									if ($ovpnserverconf['dev_mode'] == "tap") {
										continue 3;
									}
								}
							}
						}
					}
					$ctype = "VPNv6";
				} else if ($tunnelif == "gif" || $tunnelif == "gre") {
					$ctype = "TUNNELv6";
				}
				break;
		}
		$ctype = "_". strtoupper($ctype);

		$gateway = array();
		$gateway['dynamic'] = false;
		$gateway['ipprotocol'] = "inet6";
		$gateway['gateway'] = get_interface_gateway_v6($ifname, $gateway['dynamic']);
		$gateway['interface'] = get_real_interface($ifname, "inet6");
		switch ($ifcfg['ipaddrv6']) {
			case "6rd":
			case "6to4":
				$gateway['dynamic'] = "default";
				break;
		}
		$gateway['friendlyiface'] = $ifname;
		$gateway['name'] = "{$friendly}{$ctype}";
		$gateway['attribute'] = "system";

		if (($gateway['dynamic'] === "default") && ($found_defaultv6 == 0)) {
			$gateway['defaultgw'] = true;
			$gateway['dynamic'] = true;
			$found_defaultv6 = 1;
		}

		/* Loopback dummy for dynamic interfaces without a IP */
		if (!is_ipaddrv6($gateway['gateway']) && $gateway['dynamic'] == true) {
			$gateway['gateway'] = "dynamic";
		}

		/* automatically skip known static and dynamic gateways that were previously processed */
		foreach ($gateways_arr_temp as $gateway_item) {
			if ((($ifname == $gateway_item['friendlyiface'] && $friendly == $gateway_item['name']) && ($gateway['ipprotocol'] == $gateway_item['ipprotocol'])) ||
			    (($ifname == $gateway_item['friendlyiface'] && $gateway_item['dynamic'] == true) && ($gateway['ipprotocol'] == $gateway_item['ipprotocol']))) {
				continue 2;
			}
		}

		if (is_ipaddrv6($gateway['gateway'])) {
			$gateway['monitor'] = $gateway['gateway'];
		}

		$gateway['descr'] = "Interface {$friendly}{$ctype} Gateway";
		$gateways_arr[$gateway['name']] = $gateway;
	}
	unset($gateway);

	/* FIXME: Should this be enabled.
	 * Some interface like wan might be default but have no info recorded
	 * the config. */
	/* this is a fallback if all else fails and we want to get packets out @smos */
	if ($found_defaultv4 == 0 || $found_defaultv6 == 0) {
		foreach ($gateways_arr as &$gateway) {
			if (($gateway['friendlyiface'] == "wan") && ($found_defaultv4 == 0) && (!isset($gateway['ipprotocol']) || ($gateway['ipprotocol'] == "inet"))) {
				if (file_exists("{$g['tmp_path']}/{$gateway['interface']}_defaultgw")) {
					$gateway['defaultgw'] = true;
					$found_defaultv4 = 1;
				}
			}
			else if (($gateway['friendlyiface'] == "wan") && ($found_defaultv6 == 0) && ($gateway['ipprotocol'] == "inet6")) {
				if (file_exists("{$g['tmp_path']}/{$gateway['interface']}_defaultgwv6")) {
					$gateway['defaultgw'] = true;
					$found_defaultv6 = 1;
				}
			}
		}
	}

	if ($localhost === true) {
		/* attach localhost for Null routes */
		$gwlo4 = array();
		$gwlo4['name'] = "Null4";
		$gwlo4['interface'] = "lo0";
		$gwlo4['ipprotocol'] = "inet";
		$gwlo4['gateway'] = "127.0.0.1";
		$gwlo6 = array();
		$gwlo6['name'] = "Null6";
		$gwlo6['interface'] = "lo0";
		$gwlo6['ipprotocol'] = "inet6";
		$gwlo6['gateway'] = "::1";
		$gateways_arr['Null4'] = $gwlo4;
		$gateways_arr['Null6'] = $gwlo6;
	}
	return($gateways_arr);
}

function fixup_default_gateway($ipprotocol, $gateways_status, $gateways_arr) {
	global $config, $g;
	/*
	 * NOTE: The code below is meant to replace the default gateway when it goes down.
	 *	This facilitates services running on pfSense itself and are not handled by a PBR to continue working.
	 */
	$upgw = '';
	$dfltgwname = '';
	$dfltgwdown = false;
	$dfltgwfound = false;
	foreach ($gateways_arr as $gwname => $gwsttng) {
		if (($gwsttng['ipprotocol'] == $ipprotocol) && isset($gwsttng['defaultgw'])) {
			$dfltgwfound = true;
			$dfltgwname = $gwname;
			if (!isset($gwsttng['monitor_disable']) && $gateways_status[$gwname]['status'] != "none") {
				$dfltgwdown = true;
			}
		}
		/* Keep a record of the last up gateway */
		/* XXX: Blacklist lan for now since it might cause issues to those who have a gateway set for it */
		if (empty($upgw) && ($gwsttng['ipprotocol'] == $ipprotocol) && (isset($gwsttng['monitor_disable']) || $gateways_status[$gwname]['status'] == "none") && $gwsttng[$gwname]['friendlyiface'] != "lan") {
			$upgw = $gwname;
		}
		if ($dfltgwdown == true && !empty($upgw)) {
			break;
		}
	}
	if ($dfltgwfound == false) {
		$gwname = convert_friendly_interface_to_friendly_descr("wan");
		if (!empty($gateways_status[$gwname]) && stristr($gateways_status[$gwname]['status'], "down")) {
			$dfltgwdown = true;
		}
	}
	if ($dfltgwdown == true && !empty($upgw)) {
		if ($gateways_arr[$upgw]['gateway'] == "dynamic") {
			$gateways_arr[$upgw]['gateway'] = get_interface_gateway($gateways_arr[$upgw]['friendlyiface']);
		}
		if (is_ipaddr($gateways_arr[$upgw]['gateway'])) {
			log_error("Default gateway down setting {$upgw} as default!");
			if (is_ipaddrv6($gateways_arr[$upgw]['gateway'])) {
				$inetfamily = "-inet6";
			} else {
				$inetfamily = "-inet";
			}
			mwexec("/sbin/route change {$inetfamily} default {$gateways_arr[$upgw]['gateway']}");
		}
	} else if (!empty($dfltgwname)) {
		$defaultgw = trim(exec("/sbin/route -n get -{$ipprotocol} default | /usr/bin/awk '/gateway:/ {print $2}'"), " \n");
		if ($ipprotocol == 'inet6' && !is_ipaddrv6($gateways_arr[$dfltgwname]['gateway'])) {
			return;
		}
		if ($ipprotocol == 'inet' && !is_ipaddrv4($gateways_arr[$dfltgwname]['gateway'])) {
			return;
		}
		if ($defaultgw != $gateways_arr[$dfltgwname]['gateway']) {
			mwexec("/sbin/route change -{$ipprotocol} default {$gateways_arr[$dfltgwname]['gateway']}");
		}
	}
}

/*
 * Return an array with all gateway groups with name as key
 * All gateway groups will be processed before returning the array.
 */
function return_gateway_groups_array() {
	global $config, $g;

	/* fetch the current gateways status */
	$gateways_status = return_gateways_status(true);
	$gateways_arr = return_gateways_array();
	$gateway_groups_array = array();

	if (isset($config['system']['gw_switch_default'])) {
		fixup_default_gateway("inet", $gateways_status, $gateways_arr);
		fixup_default_gateway("inet6", $gateways_status, $gateways_arr);
	}
	if (is_array($config['gateways']['gateway_group'])) {
		$carplist = get_configured_carp_interface_list();
		foreach ($config['gateways']['gateway_group'] as $group) {
			/* create array with group gateways members separated by tier */
			$tiers = array();
			$backupplan = array();
			$gwvip_arr = array();
			foreach ($group['item'] as $item) {
				list($gwname, $tier, $vipname) = explode("|", $item);

				if (is_ipaddr($carplist[$vipname])) {
					if (!is_array($gwvip_arr[$group['name']])) {
						$gwvip_arr[$group['name']] = array();
					}
					$gwvip_arr[$group['name']][$gwname] = $vipname;
				}

				/* Do it here rather than reiterating again the group in case no member is up. */
				if (!is_array($backupplan[$tier])) {
					$backupplan[$tier] = array();
				}
				$backupplan[$tier][] = $gwname;

				/* check if the gateway is available before adding it to the array */
				if (is_array($gateways_status[$gwname])) {
					$status = $gateways_status[$gwname];
					$gwdown = false;
					if (stristr($status['status'], "down")) {
						$msg = sprintf(gettext("MONITOR: %s is down, omitting from routing group {$group['name']}"), $gwname);
						$gwdown = true;
					} else if (stristr($status['status'], "loss") && strstr($group['trigger'], "loss")) {
						/* packet loss */
						$msg = sprintf(gettext("MONITOR: %s has packet loss, omitting from routing group {$group['name']}"), $gwname);
						$gwdown = true;
					} else if (stristr($status['status'], "delay") && strstr($group['trigger'] , "latency")) {
						/* high latency */
						$msg = sprintf(gettext("MONITOR: %s has high latency, omitting from routing group {$group['name']}"), $gwname);
						$gwdown = true;
					}
					if ($gwdown == true) {
						log_error($msg);
						notify_via_growl($msg);
						notify_via_smtp($msg);
					} else {
						/* Online add member */
						if (!is_array($tiers[$tier])) {
							$tiers[$tier] = array();
						}
						$tiers[$tier][] = $gwname;
					}
				} else if (isset($gateways_arr[$gwname]['monitor_disable'])) {
					$tiers[$tier][] = $gwname;
				}
			}
			$tiers_count = count($tiers);
			if ($tiers_count == 0) {
				/* Oh dear, we have no members! Engage Plan B */
				if (!platform_booting()) {
					$msg = gettext("Gateways status could not be determined, considering all as up/active. (Group: {$group['name']})");
					log_error($msg);
					notify_via_growl($msg);
					//notify_via_smtp($msg);
				}
				$tiers = $backupplan;
			}
			/* sort the tiers array by the tier key */
			ksort($tiers);

			/* we do not really foreach the tiers as we stop after the first tier */
			foreach ($tiers as $tieridx => $tier) {
				/* process all gateways in this tier */
				foreach ($tier as $member) {
					/* determine interface gateway */
					if (isset($gateways_arr[$member])) {
						$gateway = $gateways_arr[$member];
						$int = $gateway['interface'];
						$gatewayip = "";
						if (is_ipaddr($gateway['gateway'])) {
							$gatewayip = $gateway['gateway'];
						} else if (!empty($int)) {
							$gatewayip = get_interface_gateway($gateway['friendlyiface']);
						}

						if (!empty($int)) {
							$gateway_groups_array[$group['name']]['ipprotocol'] = $gateway['ipprotocol'];
							if (is_ipaddr($gatewayip)) {
								$groupmember = array();
								$groupmember['int'] = $int;
								$groupmember['gwip'] = $gatewayip;
								$groupmember['weight'] = isset($gateway['weight']) ? $gateway['weight'] : 1;
								if (is_array($gwvip_arr[$group['name']])&& !empty($gwvip_arr[$group['name']][$member])) {
									$groupmember['vip'] = $gwvip_arr[$group['name']][$member];
								}
								$gateway_groups_array[$group['name']][] = $groupmember;
							}
						}
					}
				}
				/* we should have the 1st available tier now, exit stage left */
				if (count($gateway_groups_array[$group['name']]) > 0) {
					break;
				} else {
					log_error("GATEWAYS: Group {$group['name']} did not have any gateways up on tier {$tieridx}!");
				}
			}
		}
	}

	return ($gateway_groups_array);
}

/* Update DHCP WAN Interface ip address in gateway group item */
function dhclient_update_gateway_groups_defaultroute($interface = "wan") {
	global $config, $g;
	foreach ($config['gateways']['gateway_item'] as & $gw) {
		if ($gw['interface'] == $interface) {
			$current_gw = get_interface_gateway($interface);
			if ($gw['gateway'] <> $current_gw) {
				$gw['gateway'] = $current_gw;
				$changed = true;
			}
		}
	}
	if ($changed && $current_gw) {
		write_config(sprintf(gettext('Updating gateway group gateway for %1$s - new gateway is %2$s'), $interfac, $current_gw));
	}
}

function lookup_gateway_ip_by_name($name, $disabled = false) {

	$gateways_arr = return_gateways_array($disabled, true);
	foreach ($gateways_arr as $gname => $gw) {
		if ($gw['name'] === $name || $gname === $name) {
			return $gw['gateway'];
		}
	}

	return false;
}

function lookup_gateway_monitor_ip_by_name($name) {

	$gateways_arr = return_gateways_array(false, true);
	if (!empty($gateways_arr[$name])) {
		$gateway = $gateways_arr[$name];
		if (!is_ipaddr($gateway['monitor'])) {
			return $gateway['gateway'];
		}

		return $gateway['monitor'];
	}

	return (false);
}

function lookup_gateway_interface_by_name($name) {

	$gateways_arr = return_gateways_array(false, true);
	if (!empty($gateways_arr[$name])) {
		$interfacegw = $gateways_arr[$name]['friendlyiface'];
		return ($interfacegw);
	}

	return (false);
}

function get_interface_gateway($interface, &$dynamic = false) {
	global $config, $g;

	if (substr($interface, 0, 4) == '_vip') {
		$interface = get_configured_carp_interface_list($interface, 'inet', 'iface');
	}

	$gw = NULL;
	$gwcfg = $config['interfaces'][$interface];
	if (!empty($gwcfg['gateway']) && is_array($config['gateways']['gateway_item'])) {
		foreach ($config['gateways']['gateway_item'] as $gateway) {
			if (($gateway['name'] == $gwcfg['gateway']) && (is_ipaddrv4($gateway['gateway']))) {
				$gw = $gateway['gateway'];
				break;
			}
		}
	}

	// for dynamic interfaces we handle them through the $interface_router file.
	if (($gw == NULL || !is_ipaddrv4($gw)) && !is_ipaddrv4($gwcfg['ipaddr'])) {
		$realif = get_real_interface($interface);
		if (file_exists("{$g['tmp_path']}/{$realif}_router")) {
			$gw = trim(file_get_contents("{$g['tmp_path']}/{$realif}_router"), " \n");
			$dynamic = true;
		}
		if (file_exists("{$g['tmp_path']}/{$realif}_defaultgw")) {
			$dynamic = "default";
		}

	}

	/* return gateway */
	return ($gw);
}

function get_interface_gateway_v6($interface, &$dynamic = false) {
	global $config, $g;

	if (substr($interface, 0, 4) == '_vip') {
		$interface = get_configured_carp_interface_list($interface, 'inet6', 'iface');
	}

	$gw = NULL;
	$gwcfg = $config['interfaces'][$interface];
	if (!empty($gwcfg['gatewayv6']) && is_array($config['gateways']['gateway_item'])) {
		foreach ($config['gateways']['gateway_item'] as $gateway) {
			if (($gateway['name'] == $gwcfg['gatewayv6']) && (is_ipaddrv6($gateway['gateway']))) {
				$gw = $gateway['gateway'];
				break;
			}
		}
	}

	// for dynamic interfaces we handle them through the $interface_router file.
	if (($gw == NULL || !is_ipaddrv6($gw)) && !is_ipaddrv6($gwcfg['ipaddrv6'])) {
		$realif = get_real_interface($interface);
		if (file_exists("{$g['tmp_path']}/{$realif}_routerv6")) {
			$gw = trim(file_get_contents("{$g['tmp_path']}/{$realif}_routerv6"), " \n");
			$dynamic = true;
		}
		if (file_exists("{$g['tmp_path']}/{$realif}_defaultgwv6")) {
			$dynamic = "default";
		}
	}
	/* return gateway */
	return ($gw);
}

/* Check a IP address against a gateway IP or name
 * to verify it's address family */
function validate_address_family($ipaddr, $gwname, $disabled = false) {
	$v4ip = false;
	$v6ip = false;
	$v4gw = false;
	$v6gw = false;

	if (is_ipaddrv4($ipaddr)) {
		$v4ip = true;
	}
	if (is_ipaddrv6($ipaddr)) {
		$v6ip = true;
	}
	if (is_ipaddrv4($gwname)) {
		$v4gw = true;
	}
	if (is_ipaddrv6($gwname)) {
		$v6gw = true;
	}

	if ($v4ip && $v4gw) {
		return true;
	}
	if ($v6ip && $v6gw) {
		return true;
	}

	/* still no match, carry on, lookup gateways */
	if (is_ipaddrv4(lookup_gateway_ip_by_name($gwname, $disabled))) {
		$v4gw = true;
	}
	if (is_ipaddrv6(lookup_gateway_ip_by_name($gwname, $disabled))) {
		$v6gw = true;
	}

	$gw_array = return_gateways_array();
	if (is_array($gw_array[$gwname])) {
		switch ($gw_array[$gwname]['ipprotocol']) {
			case "inet":
				$v4gw = true;
				break;
			case "inet6":
				$v6gw = true;
				break;
		}
	}

	if ($v4ip && $v4gw) {
		return true;
	}
	if ($v6ip && $v6gw) {
		return true;
	}

	return false;
}

/* check if a interface is part of a gateway group */
function interface_gateway_group_member($interface) {
	global $config;

	if (is_array($config['gateways']['gateway_group'])) {
		$groups = $config['gateways']['gateway_group'];
	} else {
		return false;
	}

	$gateways_arr = return_gateways_array(false, true);
	foreach ($groups as $group) {
		if (is_array($group['item'])) {
			foreach ($group['item'] as $item) {
				$elements = explode("|", $item);
				$gwname = $elements[0];
				if ($interface == $gateways_arr[$gwname]['interface']) {
					unset($gateways_arr);
					return true;
				}
			}
		}
	}
	unset($gateways_arr);

	return false;
}

function gateway_is_gwgroup_member($name) {
	global $config;

	if (is_array($config['gateways']['gateway_group'])) {
		$groups = $config['gateways']['gateway_group'];
	} else {
		return false;
	}

	$members = array();
	foreach ($groups as $group) {
		if (is_array($group['item'])) {
			foreach ($group['item'] as $item) {
				$elements = explode("|", $item);
				$gwname = $elements[0];
				if ($name == $elements[0]) {
					$members[] = $group['name'];
				}
			}
		}
	}

	return $members;
}
?>