<?php
/*
 * snort_post_install.php
 *
 * Copyright (C) 2006 Scott Ullrich
 * Copyright (C) 2009-2010 Robert Zelaya
 * Copyright (C) 2011-2012 Ermal Luci
 * part of pfSense
 * 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.
 */

/****************************************************************************/
/* This module is called once during the Snort package installation to      */
/* perform required post-installation setup.  It should only be executed    */
/* from the Package Manager process via the custom-post-install hook in     */
/* the snort.xml package configuration file.                                */
/****************************************************************************/

require_once("config.inc");
require_once("functions.inc");
require_once("/usr/local/pkg/snort/snort.inc");

global $config, $g, $rebuild_rules, $pkg_interface, $snort_gui_include;

$snortdir = SNORTDIR;
$snortlibdir = SNORTLIBDIR;
$rcdir = RCFILEPREFIX;

// This is a hack to workaround the caching of the old "snort.inc" by the
// Package Manager installation code.  We need this new function which is
// in the new snort.inc file during post-installation.
if (!function_exists('snort_expand_port_range')) {
	function snort_expand_port_range($ports, $delim = ',') {
		// Split the incoming string on the specified delimiter
		$tmp = explode($delim, $ports);

		// Look for any included port range and expand it
		foreach ($tmp as $val) {
			if (is_portrange($val)) {
				$start = strtok($val, ":");
				$end = strtok(":");
				if ($end !== false) {
					$val = $start . $delim;
					for ($i = intval($start) + 1; $i < intval($end); $i++)
						$val .= strval($i) . $delim;
					$val .= $end;
				}
			}
			$value .= $val . $delim;
		}

		// Remove any trailing delimiter in return value
		return trim($value, $delim);
		}
}

// This function mirrors the "snort_generate_conf()" function in the
// "snort.inc" file.  It is here with a modified name as a workaround 
// so that functionality built into the new package version can be 
// implemented during installation.  During a package reinstall, the  
// Package Manager will cache the old version of "snort.inc" and thus 
// new features are not available from the new "snort.inc" file in the 
// new package.
function snort_build_new_conf($snortcfg) {

	global $config, $g, $rebuild_rules;

	$snortdir = SNORTDIR;
	$snortlibdir = SNORTLIBDIR;
	$snortlogdir = SNORTLOGDIR;
	$flowbit_rules_file = FLOWBITS_FILENAME;
	$snort_enforcing_rules_file = ENFORCING_RULES_FILENAME;

	if (!is_array($config['installedpackages']['snortglobal']['rule']))
		return;

	/* See if we should protect and not modify the preprocessor rules files */
	if (!empty($snortcfg['protect_preproc_rules'])) 	
		$protect_preproc_rules = $snortcfg['protect_preproc_rules'];
	else
		$protect_preproc_rules = "off";

	$if_real = snort_get_real_interface($snortcfg['interface']);
	$snort_uuid = $snortcfg['uuid'];
	$snortcfgdir = "{$snortdir}/snort_{$snort_uuid}_{$if_real}";

	/* custom home nets */
	$home_net_list = snort_build_list($snortcfg, $snortcfg['homelistname']);
	$home_net = implode(",", $home_net_list);

	$external_net = '!$HOME_NET';
	if (!empty($snortcfg['externallistname']) && $snortcfg['externallistname'] != 'default') {
		$external_net_list = snort_build_list($snortcfg, $snortcfg['externallistname']);
		$external_net = implode(",", $external_net_list);
	}

	/* user added arguments */
	$snort_config_pass_thru = str_replace("\r", "", base64_decode($snortcfg['configpassthru']));
	// Remove the trailing newline
	$snort_config_pass_thru = rtrim($snort_config_pass_thru);

	/* create a few directories and ensure the sample files are in place */
	$snort_dirs = array( $snortdir, $snortcfgdir, "{$snortcfgdir}/rules",
		"{$snortlogdir}/snort_{$if_real}{$snort_uuid}",
		"{$snortlogdir}/snort_{$if_real}{$snort_uuid}/barnyard2", 
		"{$snortcfgdir}/preproc_rules", 
		"dynamicrules" => "{$snortlibdir}/dynamicrules",
		"dynamicengine" => "{$snortlibdir}/dynamicengine",
		"dynamicpreprocessor" => "{$snortcfgdir}/dynamicpreprocessor"
	    );
	foreach ($snort_dirs as $dir) {
		if (!is_dir($dir))
			safe_mkdir($dir);
	}

	/********************************************************************/
	/* For fail-safe on an initial startup following installation, and  */
	/* before a rules update has occurred, copy the default config      */
	/* files to the interface directory.  If files already exist in     */
	/* the interface directory, or they are newer, that means a rule    */
	/* update has been done and we should leave the customized files    */
	/* put in place by the rules update process.                        */
	/********************************************************************/
	$snort_files = array("gen-msg.map", "classification.config", "reference.config", "attribute_table.dtd", 
			"sid-msg.map", "unicode.map", "threshold.conf", "preproc_rules/preprocessor.rules",
			"preproc_rules/decoder.rules", "preproc_rules/sensitive-data.rules"
		);
	foreach ($snort_files as $file) {
		if (file_exists("{$snortdir}/{$file}")) {
			$ftime = filemtime("{$snortdir}/{$file}");
			if (!file_exists("{$snortcfgdir}/{$file}") || ($ftime > filemtime("{$snortcfgdir}/{$file}")))
				@copy("{$snortdir}/{$file}", "{$snortcfgdir}/{$file}");
		}
	}

	/* define alertsystemlog */
	$alertsystemlog_type = "";
	if ($snortcfg['alertsystemlog'] == "on")
		$alertsystemlog_type = "output alert_syslog: log_alert";

	/* define snortunifiedlog */
	$snortunifiedlog_type = "";
	if ($snortcfg['snortunifiedlog'] == "on")
		$snortunifiedlog_type = "output unified2: filename snort_{$snort_uuid}_{$if_real}.u2, limit 128";

	/* define spoink */
	$spoink_type = "";
	if ($snortcfg['blockoffenders7'] == "on") {
		$pfkill = "";
		if ($snortcfg['blockoffenderskill'] == "on")
			$pfkill = "kill";
		$spoink_wlist = snort_build_list($snortcfg, $snortcfg['whitelistname'], true);
		/* write whitelist */
		@file_put_contents("{$snortcfgdir}/{$snortcfg['whitelistname']}", implode("\n", $spoink_wlist));
		$spoink_type = "output alert_pf: {$snortcfgdir}/{$snortcfg['whitelistname']},snort2c,{$snortcfg['blockoffendersip']},{$pfkill}";
	}

	/* define selected suppress file */
	$suppress_file_name = "";
	$suppress = snort_find_list($snortcfg['suppresslistname'], 'suppress');
	if (!empty($suppress)) {
		$suppress_data = str_replace("\r", "", base64_decode($suppress['suppresspassthru']));
		@file_put_contents("{$snortcfgdir}/supp{$snortcfg['suppresslistname']}", $suppress_data);
		$suppress_file_name = "include {$snortcfgdir}/supp{$snortcfg['suppresslistname']}";
	}

	/* set the snort performance model */
	$snort_performance = "ac-bnfa";
	if(!empty($snortcfg['performance']))
		$snort_performance = $snortcfg['performance'];

	/* if user has defined a custom ssh port, use it */
	if(is_array($config['system']['ssh']) && isset($config['system']['ssh']['port']))
		$ssh_port = $config['system']['ssh']['port'];
	else
		$ssh_port = "22";

	/* Define an array of default values for the various preprocessor ports */
	$snort_ports = array(
		"dns_ports" => "53", "smtp_ports" => "25", "mail_ports" => "25,465,587,691",
		"http_ports" => "36,80,81,82,83,84,85,86,87,88,89,90,311,383,591,593,631,901,1220,1414,1533,1741,1830,2301,2381,2809,3037,3057,3128,3443,3702,4343,4848,5250,6080,6988,7000,7001,7144,7145,7510,7777,7779,8000,8008,8014,8028,8080,8081,8082,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8500,8800,8888,8899,9000,9060,9080,9090,9091,9443,9999,10000,11371,15489,29991,33300,34412,34443,34444,41080,44440,50000,50002,51423,55555,56712", 
		"oracle_ports" => "1024:", "mssql_ports" => "1433", "telnet_ports" => "23", 
		"snmp_ports" => "161", "ftp_ports" => "21,2100,3535", "ssh_ports" => $ssh_port, 
		"pop2_ports" => "109", "pop3_ports" => "110", "imap_ports" => "143", 
		"sip_ports" => "5060,5061,5600", "auth_ports" => "113", "finger_ports" => "79", 
		"irc_ports" => "6665,6666,6667,6668,6669,7000", "smb_ports" => "139,445",
		"nntp_ports" => "119", "rlogin_ports" => "513", "rsh_ports" => "514",
		"ssl_ports" => "443,465,563,636,989,992,993,994,995,7801,7802,7900,7901,7902,7903,7904,7905,7906,7907,7908,7909,7910,7911,7912,7913,7914,7915,7916,7917,7918,7919,7920",
		"file_data_ports" => "\$HTTP_PORTS,110,143", "shellcode_ports" => "!80", 
		"sun_rpc_ports" => "111,32770,32771,32772,32773,32774,32775,32776,32777,32778,32779",
		"DCERPC_NCACN_IP_TCP" => "139,445", "DCERPC_NCADG_IP_UDP" => "138,1024:",
		"DCERPC_NCACN_IP_LONG" => "135,139,445,593,1024:", "DCERPC_NCACN_UDP_LONG" => "135,1024:",
		"DCERPC_NCACN_UDP_SHORT" => "135,593,1024:", "DCERPC_NCACN_TCP" => "2103,2105,2107",
		"DCERPC_BRIGHTSTORE" => "6503,6504", "DNP3_PORTS" => "20000", "MODBUS_PORTS" => "502",
		"GTP_PORTS" => "2123,2152,3386"
	);

	/* Check for defined Aliases that may override default port settings as we build the portvars array */
	$portvardef = "";
	foreach ($snort_ports as $alias => $avalue) {
		if (!empty($snortcfg["def_{$alias}"]) && is_alias($snortcfg["def_{$alias}"]))
			$snort_ports[$alias] = trim(filter_expand_alias($snortcfg["def_{$alias}"]));
		$snort_ports[$alias] = preg_replace('/\s+/', ',', trim($snort_ports[$alias]));
		$portvardef .= "portvar " . strtoupper($alias) . " [" . $snort_ports[$alias] . "]\n";
	}

	/* Define the default ports for the Stream5 preprocessor (formatted for easier reading in the snort.conf file) */
	$stream5_ports_client = "21 22 23 25 42 53 70 79 109 110 111 113 119 135 136 137 \\\n";
	$stream5_ports_client .= "\t             139 143 161 445 513 514 587 593 691 1433 1521 1741 \\\n";
	$stream5_ports_client .= "\t             2100 3306 6070 6665 6666 6667 6668 6669 7000 8181 \\\n";
	$stream5_ports_client .= "\t             32770 32771 32772 32773 32774 32775 32776 32777 \\\n";
	$stream5_ports_client .= "\t             32778 32779";
        $stream5_ports_both = "80 81 82 83 84 85 86 87 88 89 90 110 311 383 443 465 563 \\\n";
	$stream5_ports_both .= "\t           591 593 631 636 901 989 992 993 994 995 1220 1414 1533 \\\n";
	$stream5_ports_both .= "\t           1830 2301 2381 2809 3037 3057 3128 3443 3702 4343 4848 \\\n";
	$stream5_ports_both .= "\t           5250 6080 6988 7907 7000 7001 7144 7145 7510 7802 7777 \\\n";
	$stream5_ports_both .= "\t           7779 7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 \\\n";
	$stream5_ports_both .= "\t           7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 \\\n";
	$stream5_ports_both .= "\t           8000 8008 8014 8028 8080 8081 8082 8085 8088 8090 8118 \\\n";
	$stream5_ports_both .= "\t           8123 8180 8222 8243 8280 8300 8500 8800 8888 8899 9000 \\\n";
	$stream5_ports_both .= "\t           9060 9080 9090 9091 9443 9999 10000 11371 15489 29991 \\\n";
	$stream5_ports_both .= "\t           33300 34412 34443 34444 41080 44440 50000 50002 51423 \\\n";
	$stream5_ports_both .= "\t           55555 56712";

	/////////////////////////////
	/* preprocessor code */
	/* def perform_stat */
	$perform_stat = <<<EOD
# Performance Statistics #
preprocessor perfmonitor: time 300 file {$snortlogdir}/snort_{$if_real}{$snort_uuid}/{$if_real}.stats pktcnt 10000
	
EOD;

	/* def ftp_preprocessor */
	$telnet_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['telnet_ports']));
	$ftp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ftp_ports']));

	// Configure FTP_Telnet global options
	$ftp_telnet_globals = "inspection_type ";
	if ($snortcfg['ftp_telnet_inspection_type'] != "") { $ftp_telnet_globals .= $snortcfg['ftp_telnet_inspection_type']; }else{ $ftp_telnet_globals .= "stateful"; }
	if ($snortcfg['ftp_telnet_alert_encrypted'] == "on")
		$ftp_telnet_globals .= " \\\n\tencrypted_traffic yes";
	else
		$ftp_telnet_globals .= " \\\n\tencrypted_traffic no";
	if ($snortcfg['ftp_telnet_check_encrypted'] == "on")
		$ftp_telnet_globals .= " \\\n\tcheck_encrypted";

	// Configure FTP_Telnet Telnet protocol options
	$ftp_telnet_protocol = "ports { {$telnet_ports} }";
	if ($snortcfg['ftp_telnet_normalize'] == "on")
		$ftp_telnet_protocol .= " \\\n\tnormalize";
	if ($snortcfg['ftp_telnet_detect_anomalies'] == "on")
		$ftp_telnet_protocol .= " \\\n\tdetect_anomalies";
	if ($snortcfg['ftp_telnet_ayt_attack_threshold'] <> '0') {
		$ftp_telnet_protocol .= " \\\n\tayt_attack_thresh "; 
		if ($snortcfg['ftp_telnet_ayt_attack_threshold'] != "")
			$ftp_telnet_protocol .= $snortcfg['ftp_telnet_ayt_attack_threshold'];
		else
			$ftp_telnet_protocol .= "20";
	}

	// Setup the standard FTP commands used for all FTP Server engines
	$ftp_cmds = <<<EOD
	ftp_cmds { USER PASS ACCT CWD SDUP SMNT QUIT REIN PORT PASV TYPE STRU MODE } \
	ftp_cmds { RETR STOR STOU APPE ALLO REST RNFR RNTO ABOR DELE RMD MKD PWD } \
	ftp_cmds { LIST NLST SITE SYST STAT HELP NOOP } \
	ftp_cmds { AUTH ADAT PROT PBSZ CONF ENC } \
	ftp_cmds { FEAT CEL CMD MACB } \
	ftp_cmds { MDTM REST SIZE MLST MLSD } \
	ftp_cmds { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \
	alt_max_param_len 0 { CDUP QUIT REIN PASV STOU ABOR PWD SYST NOOP } \
	alt_max_param_len 100 { MDTM CEL XCWD SITE USER PASS REST DELE RMD SYST TEST STAT MACB EPSV CLNT LPRT } \
	alt_max_param_len 200 { XMKD NLST ALLO STOU APPE RETR STOR CMD RNFR HELP } \
	alt_max_param_len 256 { RNTO CWD } \
	alt_max_param_len 400 { PORT } \
	alt_max_param_len 512 { SIZE } \
	chk_str_fmt { USER PASS ACCT CWD SDUP SMNT PORT TYPE STRU MODE } \
	chk_str_fmt { RETR STOR STOU APPE ALLO REST RNFR RNTO DELE RMD MKD } \
	chk_str_fmt { LIST NLST SITE SYST STAT HELP } \
	chk_str_fmt { AUTH ADAT PROT PBSZ CONF ENC } \
	chk_str_fmt { FEAT CEL CMD } \
	chk_str_fmt { MDTM REST SIZE MLST MLSD } \
	chk_str_fmt { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \
	cmd_validity MODE < char ASBCZ > \
	cmd_validity STRU < char FRP > \
	cmd_validity ALLO < int [ char R int ] > \
	cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ] } > \
	cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \
	cmd_validity PORT < host_port >

EOD;

	// Configure all the FTP_Telnet FTP protocol options
	// Iterate and configure the FTP Client engines
	$ftp_default_client_engine = array( "name" => "default", "bind_to" => "all", "max_resp_len" => 256, 
					    "telnet_cmds" => "no", "ignore_telnet_erase_cmds" => "yes", 
					    "bounce" => "yes", "bounce_to_net" => "", "bounce_to_port" => "" );

	if (!is_array($snortcfg['ftp_client_engine']['item']))
		$snortcfg['ftp_client_engine']['item'] = array();

	// If no FTP client engine is configured, use the default
	// to keep from breaking Snort.
	if (empty($snortcfg['ftp_client_engine']['item']))
			$snortcfg['ftp_client_engine']['item'][] = $ftp_default_client_engine;
	$ftp_client_engine = "";

	foreach ($snortcfg['ftp_client_engine']['item'] as $f => $v) {
		$buffer = "preprocessor ftp_telnet_protocol: ftp client ";
		if ($v['name'] == "default" && $v['bind_to'] == "all")
			$buffer .= "default \\\n";
		elseif (is_alias($v['bind_to'])) {
			$tmp = trim(filter_expand_alias($v['bind_to']));
			if (!empty($tmp)) {
				$tmp = preg_replace('/\s+/', ' ', $tmp);
				$buffer .= "{$tmp} \\\n";
			}
			else {
				log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP client '{$v['name']}' ... skipping entry.");
				continue;
			}
		}
		else {
				log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP client '{$v['name']}' ... skipping entry.");
				continue;
		}

		if ($v['max_resp_len'] == "")
			$buffer .= "\tmax_resp_len 256 \\\n";
		else
			$buffer .= "\tmax_resp_len {$v['max_resp_len']} \\\n";

		$buffer .= "\ttelnet_cmds {$v['telnet_cmds']} \\\n";
		$buffer .= "\tignore_telnet_erase_cmds {$v['ignore_telnet_erase_cmds']} \\\n";

		if ($v['bounce'] == "yes") {
			if (is_alias($v['bounce_to_net']) && is_alias($v['bounce_to_port'])) {
				$net = trim(filter_expand_alias($v['bounce_to_net']));
				$port = trim(filter_expand_alias($v['bounce_to_port']));
				if (!empty($net) && !empty($port) && 
				     snort_is_single_addr_alias($v['bounce_to_net']) && 
				    (is_port($port) || is_portrange($port))) {
					$port = preg_replace('/\s+/', ',', $port);
					// Change port range delimiter to comma for ftp_telnet client preprocessor
					if (is_portrange($port))
						$port = str_replace(":", ",", $port);
					$buffer .= "\tbounce yes \\\n";
					$buffer .= "\tbounce_to { {$net},{$port} }\n";
				}
				else {
					// One or both of the BOUNCE_TO alias values is not right,
					// so figure out which and log an appropriate error.
					if (empty($net) || !snort_is_single_addr_alias($v['bounce_to_net']))
						log_error("[snort] ERROR: illegal value for bounce_to Address Alias [{$v['bounce_to_net']}] for FTP client engine [{$v['name']}] ... omitting 'bounce_to' option for this client engine.");
					if (empty($port) || !(is_port($port) || is_portrange($port)))
						log_error("[snort] ERROR: illegal value for bounce_to Port Alias [{$v['bounce_to_port']}] for FTP client engine [{$v['name']}] ... omitting 'bounce_to' option for this client engine.");
					$buffer .= "\tbounce yes\n";
				}
			}
			else
				$buffer .= "\tbounce yes\n";
		}
		else
			$buffer .= "\tbounce no\n";

		// Add this FTP client engine to the master string
		$ftp_client_engine .= "{$buffer}\n";
	}
	// Trim final trailing newline
	rtrim($ftp_client_engine);	

	// Iterate and configure the FTP Server engines
	$ftp_default_server_engine = array( "name" => "default", "bind_to" => "all", "ports" => "default", 
					    "telnet_cmds" => "no", "ignore_telnet_erase_cmds" => "yes", 
					    "ignore_data_chan" => "no", "def_max_param_len" => 100 );

	if (!is_array($snortcfg['ftp_server_engine']['item']))
		$snortcfg['ftp_server_engine']['item'] = array();

	// If no FTP server engine is configured, use the default
	// to keep from breaking Snort.
	if (empty($snortcfg['ftp_server_engine']['item']))
			$snortcfg['ftp_server_engine']['item'][] = $ftp_default_server_engine;
	$ftp_server_engine = "";

	foreach ($snortcfg['ftp_server_engine']['item'] as $f => $v) {
		$buffer = "preprocessor ftp_telnet_protocol: ftp server ";
		if ($v['name'] == "default" && $v['bind_to'] == "all")
			$buffer .= "default \\\n";
		elseif (is_alias($v['bind_to'])) {
			$tmp = trim(filter_expand_alias($v['bind_to']));
			if (!empty($tmp)) {
				$tmp = preg_replace('/\s+/', ' ', $tmp);
				$buffer .= "{$tmp} \\\n";
			}
			else {
				log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP server '{$v['name']}' ... skipping entry.");
				continue;
			}
		}
		else {
				log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP server '{$v['name']}' ... skipping entry.");
				continue;
		}

		if ($v['def_max_param_len'] == "")
			$buffer .= "\tdef_max_param_len 100 \\\n";
		elseif ($v['def_max_param_len'] <> '0')
			$buffer .= "\tdef_max_param_len {$v['def_max_param_len']} \\\n";

		if ($v['ports'] == "default" || !is_alias($v['ports']) || empty($v['ports']))
			$buffer .= "\tports { {$ftp_ports} } \\\n";
		elseif (is_alias($v['ports'])) {
			$tmp = trim(filter_expand_alias($v['ports']));
			if (!empty($tmp)) {
				$tmp = preg_replace('/\s+/', ' ', $tmp);
				$tmp = snort_expand_port_range($tmp, ' ');
				$buffer .= "\tports { {$tmp} } \\\n";
			}
			else {
				log_error("[snort] ERROR: unable to resolve Port Alias '{$v['ports']}' for FTP server '{$v['name']}' ... reverting to defaults.");
				$buffer .= "\tports { {$ftp_ports} } \\\n";
			}
		}

		$buffer .= "\ttelnet_cmds {$v['telnet_cmds']} \\\n";
		$buffer .= "\tignore_telnet_erase_cmds {$v['ignore_telnet_erase_cmds']} \\\n";
		if ($v['ignore_data_chan'] == "yes")
			$buffer .= "\tignore_data_chan yes \\\n";
		$buffer .= "{$ftp_cmds}\n";

		// Add this FTP server engine to the master string
		$ftp_server_engine .= $buffer;
	}
	// Remove trailing newlines
	rtrim($ftp_server_engine);

	$ftp_preprocessor = <<<EOD
# ftp_telnet preprocessor #
preprocessor ftp_telnet: global \
	{$ftp_telnet_globals}

preprocessor ftp_telnet_protocol: telnet \
	{$ftp_telnet_protocol}

{$ftp_server_engine}
{$ftp_client_engine}
EOD;

	$pop_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['pop3_ports']));
	$pop_preproc = <<<EOD
# POP preprocessor #
preprocessor pop: \
	ports { {$pop_ports} } \
	memcap 1310700 \
	qp_decode_depth 0 \
	b64_decode_depth 0 \
	bitenc_decode_depth 0

EOD;

	$imap_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['imap_ports']));
	$imap_preproc = <<<EOD
# IMAP preprocessor #
preprocessor imap: \
	ports { {$imap_ports} } \
	memcap 1310700 \
	qp_decode_depth 0 \
	b64_decode_depth 0 \
	bitenc_decode_depth 0

EOD;

	$smtp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['mail_ports']));
	/* def smtp_preprocessor */
	$smtp_preprocessor = <<<EOD
# SMTP preprocessor #
preprocessor SMTP: \
	ports { {$smtp_ports} } \
	inspection_type stateful \
	normalize cmds \
	ignore_tls_data \
	valid_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT \
		     NOOP RSET SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX QUEU \
		     STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE \
		     XQUEU XSTA XTRN XUSR } \
	normalize_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY \
			 IDENT NOOP RSET SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT \
			 ONEX QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 \
			 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \
	max_header_line_len 1000 \ 
	max_response_line_len 512 \
	alt_max_command_line_len 260 { MAIL } \
	alt_max_command_line_len 300 { RCPT } \
	alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \
	alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \
	alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX } \
	alt_max_command_line_len 246 { QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR } \
	alt_max_command_line_len 246 { XAUTH XCIR XEXCH50 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \
	xlink2state { enable } \
	log_mailfrom \
	log_rcptto \
	log_email_hdrs \
	email_hdrs_log_depth 1464 \
	log_filename \
	qp_decode_depth 0 \
	b64_decode_depth 0 \
	bitenc_decode_depth 0 \
	uu_decode_depth 0

EOD;

	/* def sf_portscan */
	$sf_pscan_protocol = "all";
	if (!empty($snortcfg['pscan_protocol']))
		$sf_pscan_protocol = $snortcfg['pscan_protocol'];
	$sf_pscan_type = "all";
	if (!empty($snortcfg['pscan_type']))
		$sf_pscan_type = $snortcfg['pscan_type'];
	$sf_pscan_memcap = "10000000";
	if (!empty($snortcfg['pscan_memcap']))
		$sf_pscan_memcap = $snortcfg['pscan_memcap'];
	$sf_pscan_sense_level = "medium";
	if (!empty($snortcfg['pscan_sense_level']))
		$sf_pscan_sense_level = $snortcfg['pscan_sense_level'];
	$sf_pscan_ignore_scanners = "\$HOME_NET";
	if (!empty($snortcfg['pscan_ignore_scanners']) && is_alias($snortcfg['pscan_ignore_scanners'])) {
		$sf_pscan_ignore_scanners = trim(filter_expand_alias($snortcfg['pscan_ignore_scanners']));
		$sf_pscan_ignore_scanners = preg_replace('/\s+/', ',', trim($sf_pscan_ignore_scanners));
	}
	
	$sf_portscan = <<<EOD
# sf Portscan #
preprocessor sfportscan: \
	scan_type { {$sf_pscan_type} } \
	proto  { {$sf_pscan_protocol} } \
	memcap { {$sf_pscan_memcap} } \
	sense_level { {$sf_pscan_sense_level} } \
	ignore_scanners { {$sf_pscan_ignore_scanners} }
	
EOD;

	/* def ssh_preproc */
	$ssh_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ssh_ports']));
	$ssh_preproc = <<<EOD
# SSH preprocessor #
preprocessor ssh: \
	server_ports { {$ssh_ports} } \
	autodetect \
	max_client_bytes 19600 \
	max_encrypted_packets 20 \
	max_server_version_len 100 \
	enable_respoverflow enable_ssh1crc32 \
	enable_srvoverflow enable_protomismatch

EOD;

	/* def other_preprocs */
	$sun_rpc_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['sun_rpc_ports']));
	$other_preprocs = <<<EOD
# Other preprocs #
preprocessor rpc_decode: \
	{$sun_rpc_ports} \
	no_alert_multiple_requests \
	no_alert_large_fragments \
	no_alert_incomplete

# Back Orifice preprocessor #
preprocessor bo
	
EOD;

	/* def dce_rpc_2 */
	$dce_rpc_2 = <<<EOD
# DCE/RPC 2 #
preprocessor dcerpc2: \
	memcap 102400, \
	events [co]

preprocessor dcerpc2_server: default, \
	policy WinXP, \
	detect [smb [{$snort_ports['smb_ports']}], \
	tcp 135, \
	udp 135, \
	rpc-over-http-server 593], \
	autodetect [tcp 1025:, \
	udp 1025:, \
	rpc-over-http-server 1025:], \
	smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"]
	
EOD;

	$sip_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['sip_ports']));
	$sip_preproc = <<<EOD
# SIP preprocessor #
preprocessor sip: \
	max_sessions 40000, \
	ports { {$sip_ports} }, \
	methods { invite \
		cancel \
		ack \
		bye \
		register \
		options \
		refer \
		subscribe \
		update \
		join \
		info \
		message \
		notify \
		benotify \
		do \
		qauth \
		sprack \
		publish \
		service \
		unsubscribe \
		prack }, \
	max_call_id_len 80, \
	max_from_len 256, \
	max_to_len 256, \
	max_via_len 1024, \
	max_requestName_len 50, \
	max_uri_len 512, \
	ignore_call_channel, \
	max_content_len 2048, \
	max_contact_len 512

EOD;

	$dns_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['dns_ports']));
	/* def dns_preprocessor */
	$dns_preprocessor = <<<EOD
# DNS preprocessor #
preprocessor dns: \
	ports { {$dns_ports} } \
	enable_rdata_overflow
	
EOD;

	/* def dnp3_preprocessor */
	$dnp3_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['DNP3_PORTS']));
	$dnp3_preproc = <<<EOD
# DNP3 preprocessor #
preprocessor dnp3: \
	ports { {$dnp3_ports} } \
	memcap 262144 \
	check_crc
	
EOD;

	/* def modbus_preprocessor */
	$modbus_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['MODBUS_PORTS']));
	$modbus_preproc = <<<EOD
# Modbus preprocessor #
preprocessor modbus: \
	ports { {$modbus_ports} }
	
EOD;

	/* def gtp_preprocessor */
	$gtp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['GTP_PORTS']));
	$gtp_preproc = <<<EOD
# GTP preprocessor #
preprocessor gtp: \
	ports { {$gtp_ports} }
	
EOD;

	/* def ssl_preprocessor */
	$ssl_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ssl_ports']));
	$ssl_preproc = <<<EOD
# SSL preprocessor #
preprocessor ssl: \
	ports { {$ssl_ports} }, \
	trustservers, \
	noinspect_encrypted 

EOD;

	/* def sensitive_data_preprocessor */
	if ($snortcfg['sdf_mask_output'] == "on")
		$sdf_mask_output = "\\\n\tmask_output";
	else
		$sdf_mask_output = "";
	$sensitive_data = <<<EOD
# SDF preprocessor #
preprocessor sensitive_data: \
	alert_threshold {$snortcfg['sdf_alert_threshold']} {$sdf_mask_output}

EOD;

	/* define servers as IP variables */
	$snort_servers = array (
		"dns_servers" => "\$HOME_NET", "smtp_servers" => "\$HOME_NET", "http_servers" => "\$HOME_NET",
		"www_servers" => "\$HOME_NET", "sql_servers" => "\$HOME_NET", "telnet_servers" => "\$HOME_NET",
		"snmp_servers" => "\$HOME_NET", "ftp_servers" => "\$HOME_NET", "ssh_servers" => "\$HOME_NET",
		"pop_servers" => "\$HOME_NET", "imap_servers" => "\$HOME_NET", "sip_proxy_ip" => "\$HOME_NET",
		"sip_servers" => "\$HOME_NET", "rpc_servers" => "\$HOME_NET", "dnp3_server" => "\$HOME_NET",
		"dnp3_client" => "\$HOME_NET", "modbus_server" => "\$HOME_NET", "modbus_client" => "\$HOME_NET",
		"enip_server" => "\$HOME_NET", "enip_client" => "\$HOME_NET",
		"aim_servers" => "64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24"
	    );

	// Change old name from "var" to new name of "ipvar" for IP variables because 
	// Snort is deprecating the old "var" name in newer versions.
	$ipvardef = "";
	foreach ($snort_servers as $alias => $avalue) {
		if (!empty($snortcfg["def_{$alias}"]) && is_alias($snortcfg["def_{$alias}"])) {
			$avalue = trim(filter_expand_alias($snortcfg["def_{$alias}"]));
			$avalue = preg_replace('/\s+/', ',', trim($avalue));
		}
		$ipvardef .= "ipvar " . strtoupper($alias) . " [{$avalue}]\n";
	}

	$snort_preproc_libs = array(
		"dce_rpc_2" => "dce2_preproc", "dns_preprocessor" => "dns_preproc", "ftp_preprocessor" => "ftptelnet_preproc", "imap_preproc" => "imap_preproc",
		"pop_preproc" => "pop_preproc", "reputation_preproc" => "reputation_preproc", "sensitive_data" => "sdf_preproc", 
		"sip_preproc" => "sip_preproc", "gtp_preproc" => "gtp_preproc", "smtp_preprocessor" => "smtp_preproc", "ssh_preproc" => "ssh_preproc", 
		"ssl_preproc" => "ssl_preproc", "dnp3_preproc" => "dnp3_preproc", "modbus_preproc" => "modbus_preproc"
	);
	$snort_preproc = array (
		"perform_stat", "other_preprocs", "ftp_preprocessor", "smtp_preprocessor", "ssl_preproc", "sip_preproc", "gtp_preproc", "ssh_preproc",
		"sf_portscan", "dce_rpc_2", "dns_preprocessor", "sensitive_data", "pop_preproc", "imap_preproc", "dnp3_preproc", "modbus_preproc"
	);
	$default_disabled_preprocs = array(
		"sf_portscan", "gtp_preproc", "sensitive_data", "dnp3_preproc", "modbus_preproc"
	);
	$snort_preprocessors = "";
	foreach ($snort_preproc as $preproc) {
		if ($snortcfg[$preproc] == 'on' || empty($snortcfg[$preproc]) ) {

			/* If preprocessor is not explicitly "on" or "off", then default to "off" if in our default disabled list */
			if (empty($snortcfg[$preproc]) && in_array($preproc, $default_disabled_preprocs))
				continue;

			/* NOTE: The $$ is not a bug. It is an advanced feature of php */
			if (!empty($snort_preproc_libs[$preproc])) {
				$preproclib = "libsf_" . $snort_preproc_libs[$preproc];
				if (!file_exists($snort_dirs['dynamicpreprocessor'] . "{$preproclib}.so")) {
					if (file_exists("{$snortlibdir}/dynamicpreprocessor/{$preproclib}.so")) {
						@copy("{$snortlibdir}/dynamicpreprocessor/{$preproclib}.so", "{$snort_dirs['dynamicpreprocessor']}/{$preproclib}.so");
						$snort_preprocessors .= $$preproc;
						$snort_preprocessors .= "\n";
					} else
						log_error("Could not find the {$preproclib} file. Snort might error out!");
				} else {
					$snort_preprocessors .= $$preproc;
					$snort_preprocessors .= "\n";
				}
			} else {
				$snort_preprocessors .= $$preproc;
				$snort_preprocessors .= "\n";
			}
		}
	}
	// Remove final trailing newline
	$snort_preprocessors = rtrim($snort_preprocessors);

	$snort_misc_include_rules = "";
	if (file_exists("{$snortcfgdir}/reference.config"))
		$snort_misc_include_rules .= "include {$snortcfgdir}/reference.config\n";
	if (file_exists("{$snortcfgdir}/classification.config"))
		$snort_misc_include_rules .= "include {$snortcfgdir}/classification.config\n";
	if (is_dir("{$snortcfgdir}/preproc_rules")) {
		if ($snortcfg['sensitive_data'] == 'on' && $protect_preproc_rules == "off") {
			$sedcmd = '/^#alert.*classtype:sdf/s/^#//';
			if (file_exists("{$snortcfgdir}/preproc_rules/sensitive-data.rules")){
				$snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/sensitive-data.rules\n";
				#enable only selected sensitive data
				if (file_exists(SNORTDIR."/preproc_rules/sensitive-data.rules")){
					$sdf_alert_pattern="(".preg_replace("/,/","|",$snortcfg['sdf_alert_data_type']).")";
					$sd_tmp_file=file(SNORTDIR."/preproc_rules/sensitive-data.rules");
					$sd_tmp_new_file="";
					foreach ($sd_tmp_file as $sd_tmp_line)
						$sd_tmp_new_file.=preg_match("/$sdf_alert_pattern/i",$sd_tmp_line) ? $sd_tmp_line : "";
					file_put_contents("{$snortcfgdir}/preproc_rules/sensitive-data.rules",$sd_tmp_new_file,LOCK_EX);
				}
			}
		} else
			$sedcmd = '/^alert.*classtype:sdf/s/^/#/';
		if (file_exists("{$snortcfgdir}/preproc_rules/decoder.rules") &&
		    file_exists("{$snortcfgdir}/preproc_rules/preprocessor.rules") && $protect_preproc_rules == "off") {
			@file_put_contents("{$g['tmp_path']}/sedcmd", $sedcmd);
			mwexec("/usr/bin/sed -I '' -f {$g['tmp_path']}/sedcmd {$snortcfgdir}/preproc_rules/preprocessor.rules");
			mwexec("/usr/bin/sed -I '' -f {$g['tmp_path']}/sedcmd {$snortcfgdir}/preproc_rules/decoder.rules");
			@unlink("{$g['tmp_path']}/sedcmd");
			$snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/decoder.rules\n";
			$snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/preprocessor.rules\n";
		} else if (file_exists("{$snortcfgdir}/preproc_rules/decoder.rules") &&
			   file_exists("{$snortcfgdir}/preproc_rules/preprocessor.rules") && $protect_preproc_rules == "on") {
			$snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/decoder.rules\n";
			$snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/preprocessor.rules\n";
		}
		else {
			$snort_misc_include_rules .= "config autogenerate_preprocessor_decoder_rules\n";
			log_error("[Snort] Seems preprocessor/decoder rules are missing, enabling autogeneration of them");
		}
	} else {
		$snort_misc_include_rules .= "config autogenerate_preprocessor_decoder_rules\n";
		log_error("[Snort] Seems preprocessor/decoder rules are missing, enabling autogeneration of them");
	}

	/* generate rule sections to load */
	/* The files are always configured so the update process is easier */
	$selected_rules_sections = "include \$RULE_PATH/{$snort_enforcing_rules_file}\n";
	$selected_rules_sections .= "include \$RULE_PATH/{$flowbit_rules_file}\n";
	$selected_rules_sections  .= "include \$RULE_PATH/custom.rules\n";

	// Remove trailing newlines
	$snort_misc_include_rules = rtrim($snort_misc_include_rules);
	$selected_rules_sections = rtrim($selected_rules_sections);

	/* Create the actual rules files and save in the interface directory */
	snort_prepare_rule_files($snortcfg, $snortcfgdir);

	$cksumcheck = "all";
	if ($snortcfg['cksumcheck'] == 'on')
		$cksumcheck = "none";

	/* Pull in user-configurable detection config options */
	$cfg_detect_settings = "search-method {$snort_performance} max-pattern-len 20 max_queue_events 5";
	if ($snortcfg['fpm_split_any_any'] == "on")
		$cfg_detect_settings .= " split-any-any";
	if ($snortcfg['fpm_search_optimize'] == "on")
		$cfg_detect_settings .= " search-optimize";
	if ($snortcfg['fpm_no_stream_inserts'] == "on")
		$cfg_detect_settings .= " no_stream_inserts";

	/* Pull in user-configurable options for Frag3 preprocessor settings */
	/* Get global Frag3 options first and put into a string */
	$frag3_global = "preprocessor frag3_global: ";
	if (!empty($snortcfg['frag3_memcap']) || $snortcfg['frag3_memcap'] == "0")
		$frag3_global .= "memcap {$snortcfg['frag3_memcap']}, ";
	else
		$frag3_global .= "memcap 4194304, ";
	if (!empty($snortcfg['frag3_max_frags']))
		$frag3_global .= "max_frags {$snortcfg['frag3_max_frags']}";
	else
		$frag3_global .= "max_frags 8192";
	if ($snortcfg['frag3_detection'] == "off")
		$frag3_global .= ", disabled";

	$frag3_default_tcp_engine = array( "name" => "default", "bind_to" => "all", "policy" => "bsd", 
					   "timeout" => 60, "min_ttl" => 1, "detect_anomalies" => "on", 
					   "overlap_limit" => 0, "min_frag_len" => 0 );
	$frag3_engine = "";

	// Now iterate configured Frag3 engines and write them to a string if enabled
	if ($snortcfg['frag3_detection'] == "on") {
		if (!is_array($snortcfg['frag3_engine']['item']))
			$snortcfg['frag3_engine']['item'] = array();

		// If no frag3 tcp engine is configured, use the default
		if (empty($snortcfg['frag3_engine']['item']))
			$snortcfg['frag3_engine']['item'][] = $frag3_default_tcp_engine;

		foreach ($snortcfg['frag3_engine']['item'] as $f => $v) {
			$frag3_engine .= "preprocessor frag3_engine: ";
			$frag3_engine .= "policy {$v['policy']}";
			if ($v['bind_to'] <> "all") {
				$tmp = trim(filter_expand_alias($v['bind_to']));
				if (!empty($tmp)) {
					$tmp = preg_replace('/\s+/', ',', $tmp);
					if (strpos($tmp, ",") !== false)
						$frag3_engine .= " \\\n\tbind_to [{$tmp}]";
					else
						$frag3_engine .= " \\\n\tbind_to {$tmp}";
				}
				else
					log_error("[snort] WARNING: unable to resolve IP List Alias '{$v['bind_to']}' for Frag3 engine '{$v['name']}' ... using 0.0.0.0 failsafe.");
			}
			$frag3_engine .= " \\\n\ttimeout {$v['timeout']}";
			$frag3_engine .= " \\\n\tmin_ttl {$v['min_ttl']}";
			if ($v['detect_anomalies'] == "on") {
				$frag3_engine .= " \\\n\tdetect_anomalies";
				$frag3_engine .= " \\\n\toverlap_limit {$v['overlap_limit']}";
				$frag3_engine .= " \\\n\tmin_fragment_length {$v['min_frag_len']}";
			}
			// Add newlines to terminate this engine
			$frag3_engine .= "\n\n";
		}
		// Remove trailing newline
		$frag3_engine = rtrim($frag3_engine);
	}

	// Grab any user-customized value for Protocol Aware Flushing (PAF) max PDUs
	$paf_max_pdu_config = "config paf_max: ";
	if (empty($snortcfg['max_paf']) || $snortcfg['max_paf'] == '0')
		$paf_max_pdu_config .= "0";
	else
		$paf_max_pdu_config .= $snortcfg['max_paf'];

	// Pull in user-configurable options for Stream5 preprocessor settings
	// Get global options first and put into a string
	$stream5_global = "preprocessor stream5_global: \\\n";
	if ($snortcfg['stream5_reassembly'] == "off")
		$stream5_global .= "\tdisabled, \\\n";
	if ($snortcfg['stream5_track_tcp'] == "off")
		$stream5_global .= "\ttrack_tcp no,";
	else {
		$stream5_global .= "\ttrack_tcp yes,";
		if (!empty($snortcfg['stream5_max_tcp']))
			$stream5_global .= " \\\n\tmax_tcp {$snortcfg['stream5_max_tcp']},";
		else
			$stream5_global .= " \\\n\tmax_tcp 262144,";
	}
	if ($snortcfg['stream5_track_udp'] == "off")
		$stream5_global .= " \\\n\ttrack_udp no,";
	else {
		$stream5_global .= " \\\n\ttrack_udp yes,";
		if (!empty($snortcfg['stream5_max_udp']))
			$stream5_global .= " \\\n\tmax_udp {$snortcfg['stream5_max_udp']},";
		else
			$stream5_global .= " \\\n\tmax_udp 131072,";
	}
	if ($snortcfg['stream5_track_icmp'] == "on") {
		$stream5_global .= " \\\n\ttrack_icmp yes,";
		if (!empty($snortcfg['stream5_max_icmp']))
			$stream5_global .= " \\\n\tmax_icmp {$snortcfg['stream5_max_icmp']},";
		else
			$stream5_global .= " \\\n\tmax_icmp 65536,";
	}
	else
		$stream5_global .= " \\\n\ttrack_icmp no,";
	if (!empty($snortcfg['stream5_mem_cap']))
		$stream5_global .= " \\\n\tmemcap {$snortcfg['stream5_mem_cap']},";
	else
		$stream5_global .= " \\\n\tmemcap 8388608,";

	if (!empty($snortcfg['stream5_prune_log_max']) || $snortcfg['stream5_prune_log_max'] == '0')
		$stream5_global .= " \\\n\tprune_log_max {$snortcfg['stream5_prune_log_max']}";
	else
		$stream5_global .= " \\\n\tprune_log_max 1048576";
	if ($snortcfg['stream5_flush_on_alert'] == "on")
		$stream5_global .= ", \\\n\tflush_on_alert";

	$stream5_default_tcp_engine = array( "name" => "default", "bind_to" => "all", "policy" => "bsd", "timeout" => 30, 
					     "max_queued_bytes" => 1048576, "detect_anomalies" => "off", "overlap_limit" => 0, 
					     "max_queued_segs" => 2621, "require_3whs" => "off", "startup_3whs_timeout" => 0, 
					     "no_reassemble_async" => "off", "dont_store_lg_pkts" => "off", "max_window" => 0, 
					     "use_static_footprint_sizes" => "off", "check_session_hijacking" => "off", "ports_client" => "default", 
					     "ports_both" => "default", "ports_server" => "none" );
	$stream5_tcp_engine = "";

	// Now iterate configured Stream5 TCP engines and write them to a string if enabled
	if ($snortcfg['stream5_reassembly'] == "on") {
		if (!is_array($snortcfg['stream5_tcp_engine']['item']))
			$snortcfg['stream5_tcp_engine']['item'] = array();

		// If no stream5 tcp engine is configured, use the default
		if (empty($snortcfg['stream5_tcp_engine']['item']))
			$snortcfg['stream5_tcp_engine']['item'][] = $stream5_default_tcp_engine;

		foreach ($snortcfg['stream5_tcp_engine']['item'] as $f => $v) {
			$buffer = "preprocessor stream5_tcp: ";
			$buffer .= "policy {$v['policy']},";
			if ($v['bind_to'] <> "all") {
				$tmp = trim(filter_expand_alias($v['bind_to']));
				if (!empty($tmp)) {
					$tmp = preg_replace('/\s+/', ',', $tmp);
					if (strpos($tmp, ",") !== false)
						$buffer .= " \\\n\tbind_to [{$tmp}],";
					else
						$buffer .= " \\\n\tbind_to {$tmp},";
				}
				else {
					log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for Stream5 TCP engine '{$v['name']}' ... skipping this engine.");
					continue;
				}
			}
			$stream5_tcp_engine .= $buffer;
			$stream5_tcp_engine .= " \\\n\ttimeout {$v['timeout']},";
			$stream5_tcp_engine .= " \\\n\toverlap_limit {$v['overlap_limit']},";
			$stream5_tcp_engine .= " \\\n\tmax_window {$v['max_window']},";
			$stream5_tcp_engine .= " \\\n\tmax_queued_bytes {$v['max_queued_bytes']},";
			$stream5_tcp_engine .= " \\\n\tmax_queued_segs {$v['max_queued_segs']}";
			if ($v['use_static_footprint_sizes'] == "on")
				$stream5_tcp_engine .= ", \\\n\tuse_static_footprint_sizes";
			if ($v['check_session_hijacking'] == "on")
				$stream5_tcp_engine .= ", \\\n\tcheck_session_hijacking";
			if ($v['dont_store_lg_pkts'] == "on")
				$stream5_tcp_engine .= ", \\\n\tdont_store_large_packets";
			if ($v['no_reassemble_async'] == "on")
				$stream5_tcp_engine .= ", \\\n\tdont_reassemble_async";
			if ($v['detect_anomalies'] == "on")
				$stream5_tcp_engine .= ", \\\n\tdetect_anomalies";
			if ($v['require_3whs'] == "on")
				$stream5_tcp_engine .= ", \\\n\trequire_3whs {$v['startup_3whs_timeout']}";
			if (!empty($v['ports_client'])) {
				$stream5_tcp_engine .= ", \\\n\tports client";
				if ($v['ports_client'] == " all")
					$stream5_tcp_engine .= " all";
				elseif ($v['ports_client'] == "default")
					$stream5_tcp_engine .= " {$stream5_ports_client}";
				else {
					$tmp = trim(filter_expand_alias($v['ports_client']));
					if (!empty($tmp))
						$stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp));
					else {
						$stream5_tcp_engine .= " {$stream5_ports_client}";
						log_error("[snort] WARNING: unable to resolve Ports Client Alias [{$v['ports_client']}] for Stream5 TCP engine '{$v['name']}' ... using default value.");
					}
				}
			}
			if (!empty($v['ports_both'])) {
				$stream5_tcp_engine .= ", \\\n\tports both";
				if ($v['ports_both'] == " all")
					$stream5_tcp_engine .= " all";
				elseif ($v['ports_both'] == "default")
					$stream5_tcp_engine .= " {$stream5_ports_both}";
				else {
					$tmp = trim(filter_expand_alias($v['ports_both']));
					if (!empty($tmp))
						$stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp));
					else {
						$stream5_tcp_engine .= " {$stream5_ports_both}";
						log_error("[snort] WARNING: unable to resolve Ports Both Alias [{$v['ports_both']}] for Stream5 TCP engine '{$v['name']}' ... using default value.");
					}
				}
			}
			if (!empty($v['ports_server']) && $v['ports_server'] <> "none" && $v['ports_server'] <> "default") {
				if ($v['ports_server'] == " all") {
					$stream5_tcp_engine .= ", \\\n\tports server";
					$stream5_tcp_engine .= " all";
				}
				else {
					$tmp = trim(filter_expand_alias($v['ports_server']));
					if (!empty($tmp)) {
						$stream5_tcp_engine .= ", \\\n\tports server";
						$stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp));
					}
					else
						log_error("[snort] WARNING: unable to resolve Ports Server Alias [{$v['ports_server']}] for Stream5 TCP engine '{$v['name']}' ... defaulting to none.");
				}
			}

			// Make sure the "ports" parameter is set, or else default to a safe value
			if (strpos($stream5_tcp_engine, "ports ") === false)
				$stream5_tcp_engine .= ", \\\n\tports both all";

			// Add a pair of newlines to terminate this engine
			$stream5_tcp_engine .= "\n\n";
		}
		// Trim off the final trailing newline
		$stream5_tcp_engine = rtrim($stream5_tcp_engine);
	}

	// Configure the Stream5 UDP engine if it and Stream5 reassembly are enabled
	if ($snortcfg['stream5_track_udp'] == "off" || $snortcfg['stream5_reassembly'] == "off")
		$stream5_udp_engine = "";
	else {
		$stream5_udp_engine = "preprocessor stream5_udp: ";
		if (!empty($snortcfg['stream5_udp_timeout'])) 
			$stream5_udp_engine .= "timeout {$snortcfg['stream5_udp_timeout']}";
		else
			$stream5_udp_engine .= "timeout 30";
	}

	// Configure the Stream5 ICMP engine if it and Stream5 reassembly are enabled
	if ($snortcfg['stream5_track_icmp'] == "on" && $snortcfg['stream5_reassembly'] == "on") {
		$stream5_icmp_engine = "preprocessor stream5_icmp: ";
		if (!empty($snortcfg['stream5_icmp_timeout'])) 
			$stream5_icmp_engine .= "timeout {$snortcfg['stream5_icmp_timeout']}";
		else
			$stream5_icmp_engine .= "timeout 30";
	}
	else
		$stream5_icmp_engine = "";

	// Check for and configure Host Attribute Table if enabled
	$host_attrib_config = "";
	if ($snortcfg['host_attribute_table'] == "on" && !empty($snortcfg['host_attribute_data'])) {
		file_put_contents("{$snortcfgdir}/host_attributes", base64_decode($snortcfg['host_attribute_data']));
		$host_attrib_config = "# Host Attribute Table #\n";
		$host_attrib_config .= "attribute_table filename {$snortcfgdir}/host_attributes\n";
		if (!empty($snortcfg['max_attribute_hosts']))
			$host_attrib_config .= "config max_attribute_hosts: {$snortcfg['max_attribute_hosts']}\n";
		if (!empty($snortcfg['max_attribute_services_per_host']))
			$host_attrib_config .= "config max_attribute_services_per_host: {$snortcfg['max_attribute_services_per_host']}";
	}

	// Configure the HTTP_INSPECT preprocessor
	// Get global options first and put into a string
	$http_inspect_global = "preprocessor http_inspect: global ";
	if ($snortcfg['http_inspect'] == "off")
		$http_inspect_global .= "disabled ";
	$http_inspect_global .= "\\\n\tiis_unicode_map unicode.map 1252 \\\n";
	$http_inspect_global .= "\tcompress_depth 65535 \\\n";
	$http_inspect_global .= "\tdecompress_depth 65535 \\\n";
	if (!empty($snortcfg['http_inspect_memcap']))
		$http_inspect_global .= "\tmemcap {$snortcfg['http_inspect_memcap']} \\\n";
	else
		$http_inspect_global .= "\tmemcap 150994944 \\\n";
	if (!empty($snortcfg['http_inspect_max_gzip_mem']))
		$http_inspect_global .= "\tmax_gzip_mem {$snortcfg['http_inspect_max_gzip_mem']}";
	else
		$http_inspect_global .= "\tmax_gzip_mem 838860";
	if ($snortcfg['http_inspect_proxy_alert'] == "on")
		$http_inspect_global .= " \\\n\tproxy_alert";

	$http_inspect_default_engine = array( "name" => "default", "bind_to" => "all", "server_profile" => "all", "enable_xff" => "off", 
					      "log_uri" => "off", "log_hostname" => "off", "server_flow_depth" => 65535, "enable_cookie" => "on", 
					      "client_flow_depth" => 1460, "extended_response_inspection" => "on", "no_alerts" => "off", 
					      "unlimited_decompress" => "on", "inspect_gzip" => "on", "normalize_cookies" =>"on", "normalize_headers" => "on", 
					      "normalize_utf" => "on", "normalize_javascript" => "on", "allow_proxy_use" => "off", "inspect_uri_only" => "off", 
					      "max_javascript_whitespaces" => 200, "post_depth" => -1, "max_headers" => 0, "max_spaces" => 0, 
					      "max_header_length" => 0, "ports" => "default" );
	$http_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['http_ports']));
	$http_inspect_servers = "";

	// Iterate configured HTTP_INSPECT servers and write them to string if HTTP_INSPECT enabled
	if ($snortcfg['http_inspect'] <> "off") {
		if (!is_array($snortcfg['http_inspect_engine']['item']))
			$snortcfg['http_inspect_engine']['item'] = array();

		// If no http_inspect_engine is configured, use the default
		if (empty($snortcfg['http_inspect_engine']['item']))
			$snortcfg['http_inspect_engine']['item'][] = $http_inspect_default_engine;

		foreach ($snortcfg['http_inspect_engine']['item'] as $f => $v) {
			$buffer = "preprocessor http_inspect_server: \\\n";
			if ($v['name'] == "default")
				$buffer .= "\tserver default \\\n";
			elseif (is_alias($v['bind_to'])) {
				$tmp = trim(filter_expand_alias($v['bind_to']));
				if (!empty($tmp)) {
					$tmp = preg_replace('/\s+/', ' ', $tmp);
						$buffer .= "\tserver { {$tmp} } \\\n";
				}
				else {
					log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for HTTP_INSPECT server '{$v['name']}' ... skipping this server engine.");
					continue;
				}
			}
			else {
					log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for HTTP_INSPECT server '{$v['name']}' ... skipping this server engine.");
					continue;
			}
			$http_inspect_servers .= $buffer;
			$http_inspect_servers .= "\tprofile {$v['server_profile']} \\\n";

			if ($v['no_alerts'] == "on")
				$http_inspect_servers .= "\tno_alerts \\\n";

			if ($v['ports'] == "default" || empty($v['ports']))
				$http_inspect_servers .= "\tports { {$http_ports} } \\\n";
			elseif (is_alias($v['ports'])) {
				$tmp = trim(filter_expand_alias($v['ports']));
				if (!empty($tmp)) {
					$tmp = preg_replace('/\s+/', ' ', $tmp);
					$tmp = snort_expand_port_range($tmp, ' ');
					$http_inspect_servers .= "\tports { {$tmp} } \\\n";
				}
				else {
					log_error("[snort] WARNING: unable to resolve Ports Alias [{$v['ports']}] for HTTP_INSPECT server '{$v['name']}' ... using safe default instead.");
					$http_inspect_servers .= "\tports { {$http_ports} } \\\n";
				}
			}
			else {
					log_error("[snort] WARNING: unable to resolve Ports Alias [{$v['ports']}] for HTTP_INSPECT server '{$v['name']}' ... using safe default instead.");
					$http_inspect_servers .= "\tports { {$http_ports} } \\\n";
			}

			$http_inspect_servers .= "\tserver_flow_depth {$v['server_flow_depth']} \\\n";
			$http_inspect_servers .= "\tclient_flow_depth {$v['client_flow_depth']} \\\n";
			$http_inspect_servers .= "\thttp_methods { GET POST PUT SEARCH MKCOL COPY MOVE LOCK UNLOCK NOTIFY POLL BCOPY BDELETE BMOVE LINK UNLINK OPTIONS HEAD DELETE TRACE TRACK CONNECT SOURCE SUBSCRIBE UNSUBSCRIBE PROPFIND PROPPATCH BPROPFIND BPROPPATCH RPC_CONNECT PROXY_SUCCESS BITS_POST CCM_POST SMS_POST RPC_IN_DATA RPC_OUT_DATA RPC_ECHO_DATA } \\\n";
			$http_inspect_servers .= "\tpost_depth {$v['post_depth']} \\\n";
			$http_inspect_servers .= "\tmax_headers {$v['max_headers']} \\\n";
			$http_inspect_servers .= "\tmax_header_length {$v['max_header_length']} \\\n";
			$http_inspect_servers .= "\tmax_spaces {$v['max_spaces']}";
			if ($v['enable_xff'] == "on")
				$http_inspect_servers .= " \\\n\tenable_xff";
			if ($v['enable_cookie'] == "on")
				$http_inspect_servers .= " \\\n\tenable_cookie";
			if ($v['normalize_cookies'] == "on")
				$http_inspect_servers .= " \\\n\tnormalize_cookies";
			if ($v['normalize_headers'] == "on")
				$http_inspect_servers .= " \\\n\tnormalize_headers";
			if ($v['normalize_utf'] == "on")
				$http_inspect_servers .= " \\\n\tnormalize_utf";
			if ($v['allow_proxy_use'] == "on")
				$http_inspect_servers .= " \\\n\tallow_proxy_use";
			if ($v['inspect_uri_only'] == "on")
				$http_inspect_servers .= " \\\n\tinspect_uri_only";
			if ($v['extended_response_inspection'] == "on") {
				$http_inspect_servers .= " \\\n\textended_response_inspection";
				if ($v['inspect_gzip'] == "on") {
					$http_inspect_servers .= " \\\n\tinspect_gzip";
					if ($v['unlimited_decompress'] == "on")
						$http_inspect_servers .= " \\\n\tunlimited_decompress";
				}
				if ($v['normalize_javascript'] == "on") {
					$http_inspect_servers .= " \\\n\tnormalize_javascript";
					$http_inspect_servers .= " \\\n\tmax_javascript_whitespaces {$v['max_javascript_whitespaces']}";
				}
			}
			if ($v['log_uri'] == "on")
				$http_inspect_servers .= " \\\n\tlog_uri";
			if ($v['log_hostname'] == "on")
				$http_inspect_servers .= " \\\n\tlog_hostname";

			// Add a pair of trailing newlines to terminate this server config
			$http_inspect_servers .= "\n\n";
		}
		/* Trim off the final trailing newline */
		$http_inspect_server = rtrim($http_inspect_server);
	}

	// Finally, build the Snort configuration file
	$snort_conf_text = <<<EOD
# snort configuration file
# generated automatically by the pfSense subsystems do not modify manually

# Define Local Network #
ipvar HOME_NET [{$home_net}]
ipvar EXTERNAL_NET [{$external_net}]

# Define Rule Paths #
var RULE_PATH {$snortcfgdir}/rules
var PREPROC_RULE_PATH {$snortcfgdir}/preproc_rules

# Define Servers #
{$ipvardef}

# Define Server Ports #
{$portvardef}

# Configure quiet startup mode #
config quiet

# Configure the snort decoder #
config checksum_mode: {$cksumcheck}
config disable_decode_alerts
config disable_tcpopt_experimental_alerts
config disable_tcpopt_obsolete_alerts
config disable_ttcp_alerts
config disable_tcpopt_alerts
config disable_ipopt_alerts
config disable_decode_drops

# Enable the GTP decoder #
config enable_gtp

# Configure PCRE match limitations
config pcre_match_limit: 3500
config pcre_match_limit_recursion: 1500

# Configure the detection engine #
config detection: {$cfg_detect_settings}
config event_queue: max_queue 8 log 5 order_events content_length

# Configure to show year in timestamps
config show_year

# Configure protocol aware flushing #
# For more information see README.stream5 #
{$paf_max_pdu_config}

# Configure dynamically loaded libraries
dynamicpreprocessor directory {$snort_dirs['dynamicpreprocessor']}
dynamicengine directory {$snort_dirs['dynamicengine']}
dynamicdetection directory {$snort_dirs['dynamicrules']}

# Inline packet normalization. For more information, see README.normalize
# Disabled since we do not use "inline" mode with pfSense
# preprocessor normalize_ip4
# preprocessor normalize_tcp: ips ecn stream
# preprocessor normalize_icmp4
# preprocessor normalize_ip6
# preprocessor normalize_icmp6

# Flow and stream #
{$frag3_global}

{$frag3_engine}

{$stream5_global}

{$stream5_tcp_engine}

{$stream5_udp_engine}

{$stream5_icmp_engine}

# HTTP Inspect #
{$http_inspect_global}

{$http_inspect_servers}
{$snort_preprocessors}
{$host_attrib_config}

# Snort Output Logs #
output alert_csv: alert timestamp,sig_generator,sig_id,sig_rev,msg,proto,src,srcport,dst,dstport,id,classification,priority
{$alertsystemlog_type}
{$snortunifiedlog_type}
{$spoink_type}
						
# Misc Includes #
{$snort_misc_include_rules}

{$suppress_file_name}

# Snort user pass through configuration
{$snort_config_pass_thru}

# Rules Selection #
{$selected_rules_sections}
EOD;

	// Write out snort.conf file
	$conf = fopen("{$snortcfgdir}/snort.conf", "w");
	if(!$conf) {
		log_error("Could not open {$snortcfgdir}/snort.conf for writing.");
		return -1;
	}
	fwrite($conf, $snort_conf_text);
	fclose($conf);
	unset($snort_conf_text, $selected_rules_sections, $suppress_file_name, $snort_misc_include_rules, $spoink_type, $snortunifiedlog_type, $alertsystemlog_type);
	unset($home_net, $external_net, $ipvardef, $portvardef);
}

/*****************************************************************************/
/* This starts the actual post-install code                                  */
/*****************************************************************************/

/* Hard kill any running Snort processes that may have been started by any   */
/* of the pfSense scripts such as check_reload_status() or rc.start_packages */
if(is_process_running("snort")) {
	exec("/usr/bin/killall -z snort");
	sleep(2);
	// Delete any leftover snort PID files in /var/run
	array_map('@unlink', glob("/var/run/snort_*.pid"));
}
// Hard kill any running Barnyard2 processes
if(is_process_running("barnyard")) {
	exec("/usr/bin/killall -z barnyard2");
	sleep(2);
	// Delete any leftover barnyard2 PID files in /var/run
	array_map('@unlink', glob("/var/run/barnyard2_*.pid"));
}

/* Set flag for post-install in progress */
$g['snort_postinstall'] = true;

/* cleanup default files */
@rename("{$snortdir}/snort.conf-sample", "{$snortdir}/snort.conf");
@rename("{$snortdir}/threshold.conf-sample", "{$snortdir}/threshold.conf");
@rename("{$snortdir}/sid-msg.map-sample", "{$snortdir}/sid-msg.map");
@rename("{$snortdir}/unicode.map-sample", "{$snortdir}/unicode.map");
@rename("{$snortdir}/classification.config-sample", "{$snortdir}/classification.config");
@rename("{$snortdir}/generators-sample", "{$snortdir}/generators");
@rename("{$snortdir}/reference.config-sample", "{$snortdir}/reference.config");
@rename("{$snortdir}/gen-msg.map-sample", "{$snortdir}/gen-msg.map");
@rename("{$snortdir}/attribute_table.dtd-sample", "{$snortdir}/attribute_table.dtd");

/* fix up the preprocessor rules filenames from a PBI package install */
$preproc_rules = array("decoder.rules", "preprocessor.rules", "sensitive-data.rules");
foreach ($preproc_rules as $file) {
	if (file_exists("{$snortdir}/preproc_rules/{$file}-sample"))
		@rename("{$snortdir}/preproc_rules/{$file}-sample", "{$snortdir}/preproc_rules/{$file}");
}

/* Remove any previously installed scripts since we rebuild them */
@unlink("{$snortdir}/sid");
@unlink("{$rcdir}/snort.sh");
@unlink("{$rcdir}/barnyard2");

/* remake saved settings */
if ($config['installedpackages']['snortglobal']['forcekeepsettings'] == 'on') {
	log_error(gettext("[Snort] Saved settings detected... rebuilding installation with saved settings..."));
	update_status(gettext("Saved settings detected..."));
	/* Do one-time settings migration for new multi-engine configurations */
	update_output_window(gettext("Please wait... migrating settings to new multi-engine configuration..."));
	include "/usr/local/pkg/snort/snort_migrate_config.php";
	update_output_window(gettext("Please wait... rebuilding installation with saved settings..."));
	log_error(gettext("[Snort] Downloading and updating configured rule types..."));
	update_output_window(gettext("Please wait... downloading and updating configured rule types..."));
	if ($pkg_interface <> "console")
		$snort_gui_include = true;
	include "/usr/local/pkg/snort/snort_check_for_rule_updates.php";
	update_status(gettext("Generating snort.conf configuration file from saved settings..."));
	$rebuild_rules = true;

	/* Create the snort.conf files for each enabled interface */
	$snortconf = $config['installedpackages']['snortglobal']['rule'];
	foreach ($snortconf as $value) {
		$if_real = snort_get_real_interface($value['interface']);

		/* create a snort.conf file for interface */
		snort_build_new_conf($value);

		/* create barnyard2.conf file for interface */
		if ($value['barnyard_enable'] == 'on')
			snort_create_barnyard2_conf($value, $if_real);
	}

	/* create snort bootup file snort.sh */
	snort_create_rc();

	/* Set Log Limit, Block Hosts Time and Rules Update Time */
	snort_snortloglimit_install_cron($config['installedpackages']['snortglobal']['snortloglimit'] == 'on' ? true : false);
	snort_rm_blocked_install_cron($config['installedpackages']['snortglobal']['rm_blocked'] != "never_b" ? true : false);
	snort_rules_up_install_cron($config['installedpackages']['snortglobal']['autorulesupdate7'] != "never_up" ? true : false);

	/* Add the recurring jobs created above to crontab */
	configure_cron();
	conf_mount_ro();

	$rebuild_rules = false;
	update_output_window(gettext("Finished rebuilding Snort configuration files..."));
	log_error(gettext("[Snort] Finished rebuilding installation from saved settings..."));

	/* Only try to start Snort if not in reboot */
	if (!$g['booting']) {
		update_status(gettext("Starting Snort using rebuilt configuration..."));
		update_output_window(gettext("Please wait... while Snort is started..."));
		log_error(gettext("[Snort] Starting Snort using rebuilt configuration..."));
		start_service("snort");
		update_output_window(gettext("Snort has been started using the rebuilt configuration..."));
	}
}

/* Done with post-install, so clear flag */
unset($g['snort_postinstall']);
log_error(gettext("[Snort] Package post-installation tasks completed..."));
return true;

?>