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<?php
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/*
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diag_packet_capture.php
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Copyright (C) 2013-2015 Electric Sheep Fencing, LP
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All rights reserved
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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pfSense_BUILDER_BINARIES: /bin/ps /usr/bin/grep /usr/sbin/tcpdump
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pfSense_MODULE: routing
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*/
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##|+PRIV
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##|*IDENT=page-diagnostics-packetcapture
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##|*NAME=Diagnostics: Packet Capture page
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##|*DESCR=Allow access to the 'Diagnostics: Packet Capture' page.
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##|*MATCH=diag_packet_capture.php*
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##|-PRIV
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$allowautocomplete = true;
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function fixup_host_logic($value) {
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return str_replace(array(" ", ",", "+", "|", "!"), array("", "and ", "and ", "or ", "not "), $value);
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}
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function strip_host_logic($value) {
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return str_replace(array(" ", ",", "+", "|", "!"), array("", "", "", "", ""), $value);
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}
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function get_host_boolean($value, $host) {
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$value = str_replace(array("!", $host), array("", ""), $value);
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$andor = "";
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switch (trim($value)) {
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case "|":
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$andor = "or ";
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break;
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case ",":
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case "+":
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$andor = "and ";
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break;
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}
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return $andor;
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}
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function has_not($value) {
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return strpos($value, '!') !== false;
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}
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function fixup_not($value) {
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return str_replace("!", "not ", $value);
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}
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function strip_not($value) {
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return ltrim(trim($value), '!');
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}
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function fixup_host($value, $position) {
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$host = strip_host_logic($value);
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$not = has_not($value) ? "not " : "";
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$andor = ($position > 0) ? get_host_boolean($value, $host) : "";
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if (is_ipaddr($host)) {
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return "{$andor}host {$not}" . $host;
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} elseif (is_subnet($host)) {
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return "{$andor}net {$not}" . $host;
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} else {
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return "";
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}
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}
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if ($_POST['downloadbtn'] == gettext("Download Capture")) {
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$nocsrf = true;
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}
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$pgtitle = array(gettext("Diagnostics"), gettext("Packet Capture"));
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require_once("guiconfig.inc");
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require_once("pfsense-utils.inc");
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$fp = "/root/";
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$fn = "packetcapture.cap";
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$snaplen = 0;//default packet length
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$count = 100;//default number of packets to capture
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$fams = array('ip', 'ip6');
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$protos = array('icmp', 'icmp6', 'tcp', 'udp', 'arp', 'carp', 'esp',
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'!icmp', '!icmp6', '!tcp', '!udp', '!arp', '!carp', '!esp');
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$input_errors = array();
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$interfaces = get_configured_interface_with_descr();
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if (isset($config['ipsec']['enable'])) {
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$interfaces['ipsec'] = "IPsec";
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}
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foreach (array('server', 'client') as $mode) {
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if (is_array($config['openvpn']["openvpn-{$mode}"])) {
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foreach ($config['openvpn']["openvpn-{$mode}"] as $id => $setting) {
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if (!isset($setting['disable'])) {
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$interfaces['ovpn' . substr($mode, 0, 1) . $setting['vpnid']] = gettext("OpenVPN") . " ".$mode.": ".htmlspecialchars($setting['description']);
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}
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}
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}
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}
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if ($_POST) {
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$host = $_POST['host'];
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$selectedif = $_POST['interface'];
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$count = $_POST['count'];
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$snaplen = $_POST['snaplen'];
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$port = $_POST['port'];
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$detail = $_POST['detail'];
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$fam = $_POST['fam'];
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$proto = $_POST['proto'];
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if (!array_key_exists($selectedif, $interfaces)) {
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$input_errors[] = gettext("Invalid interface.");
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}
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if ($fam !== "" && $fam !== "ip" && $fam !== "ip6") {
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$input_errors[] = gettext("Invalid address family.");
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}
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if ($proto !== "" && !in_array(strip_not($proto), $protos)) {
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$input_errors[] = gettext("Invalid protocol.");
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}
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if ($host != "") {
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$host_string = str_replace(array(" ", "|", ","), array("", "#|", "#+"), $host);
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if (strpos($host_string, '#') === false) {
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$hosts = array($host);
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} else {
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$hosts = explode('#', $host_string);
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}
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foreach ($hosts as $h) {
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if (!is_subnet(strip_host_logic($h)) && !is_ipaddr(strip_host_logic($h))) {
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$input_errors[] = sprintf(gettext("A valid IP address or CIDR block must be specified. [%s]"), $h);
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}
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}
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}
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if ($port != "") {
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if (!is_port(strip_not($port))) {
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$input_errors[] = gettext("Invalid value specified for port.");
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}
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}
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if ($snaplen == "") {
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$snaplen = 0;
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} else {
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if (!is_numeric($snaplen) || $snaplen < 0) {
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$input_errors[] = gettext("Invalid value specified for packet length.");
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}
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}
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if ($count == "") {
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$count = 0;
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} else {
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if (!is_numeric($count) || $count < 0) {
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$input_errors[] = gettext("Invalid value specified for packet count.");
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}
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}
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if (!count($input_errors)) {
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$do_tcpdump = true;
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conf_mount_rw();
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if ($_POST['promiscuous']) {
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//if promiscuous mode is checked
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$disablepromiscuous = "";
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} else {
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//if promiscuous mode is unchecked
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$disablepromiscuous = "-p";
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}
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if ($_POST['dnsquery']) {
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//if dns lookup is checked
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$disabledns = "";
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} else {
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//if dns lookup is unchecked
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$disabledns = "-n";
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}
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if ($_POST['startbtn'] != "" ) {
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$action = gettext("Start");
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//delete previous packet capture if it exists
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if (file_exists($fp.$fn)) {
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unlink ($fp.$fn);
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}
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} elseif ($_POST['stopbtn']!= "") {
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$action = gettext("Stop");
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$processes_running = trim(shell_exec("/bin/ps axw -O pid= | /usr/bin/grep tcpdump | /usr/bin/grep {$fn} | /usr/bin/egrep -v '(pflog|grep)'"));
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//explode processes into an array, (delimiter is new line)
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$processes_running_array = explode("\n", $processes_running);
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//kill each of the packetcapture processes
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foreach ($processes_running_array as $process) {
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$process_id_pos = strpos($process, ' ');
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$process_id = substr($process, 0, $process_id_pos);
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exec("kill $process_id");
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}
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} elseif ($_POST['downloadbtn']!= "") {
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//download file
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$fs = filesize($fp.$fn);
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header("Content-Type: application/octet-stream");
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header("Content-Disposition: attachment; filename=$fn");
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header("Content-Length: $fs");
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readfile($fp.$fn);
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exit;
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}
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}
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} else {
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$do_tcpdump = false;
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}
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include("head.inc"); ?>
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<body link="#000000" vlink="#0000CC" alink="#0000CC">
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<?php
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include("fbegin.inc");
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?>
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<?php if ($input_errors) print_input_errors($input_errors); ?>
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<table width="100%" border="0" cellpadding="0" cellspacing="0" summary="diag packet capture">
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<tr><td>
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<form action="diag_packet_capture.php" method="post" name="iform" id="iform">
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<table width="100%" border="0" cellpadding="6" cellspacing="0" summary="table">
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<tr>
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<td colspan="3" valign="top" class="listtopic"><?=gettext("Packet capture");?></td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Interface");?></td>
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<td width="32%" class="vtable">
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<select name="interface">
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<?php foreach ($interfaces as $iface => $ifacename): ?>
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<option value="<?=$iface;?>" <?php if ($selectedif == $iface) echo "selected=\"selected\""; ?>>
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<?php echo $ifacename;?>
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</option>
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<?php endforeach; ?>
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</select>
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<br /><?=gettext("Select the interface on which to capture traffic.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Promiscuous");?></td>
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<td width="51%" class="vtable">
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<input name="promiscuous" type="checkbox"<?php if ($_POST['promiscuous']) echo " checked=\"checked\""; ?> />
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<br /><?=gettext("If checked, the");?> <a target="_blank" href="http://www.freebsd.org/cgi/man.cgi?query=tcpdump&apropos=0&sektion=0&manpath=FreeBSD+8.3-stable&arch=default&format=html"><?= gettext("packet capture")?></a> <?= gettext("will be performed using promiscuous mode.");?>
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<br /><b><?=gettext("Note");?>: </b><?=gettext("Some network adapters do not support or work well in promiscuous mode.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Address Family");?></td>
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<td colspan="2" width="83%" class="vtable">
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<select name="fam">
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<option value="">Any</option>
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<option value="ip" <?php if ($fam == "ip") echo "selected=\"selected\""; ?>>IPv4 Only</option>
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<option value="ip6" <?php if ($fam == "ip6") echo "selected=\"selected\""; ?>>IPv6 Only</option>
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</select>
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<br /><?=gettext("Select the type of traffic to be captured, either Any, IPv4 only or IPv6 only.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Protocol");?></td>
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<td colspan="2" width="83%" class="vtable">
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<select name="proto">
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<option value="">Any</option>
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<option value="icmp" <?php if ($proto == "icmp") echo "selected=\"selected\""; ?>>ICMP</option>
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<option value="!icmp" <?php if ($proto == "!icmp") echo "selected=\"selected\""; ?>>Exclude ICMP</option>
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<option value="icmp6" <?php if ($proto == "icmp6") echo "selected=\"selected\""; ?>>ICMPv6</option>
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<option value="!icmp6" <?php if ($proto == "!icmp6") echo "selected=\"selected\""; ?>>Exclude ICMPv6</option>
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<option value="tcp" <?php if ($proto == "tcp") echo "selected=\"selected\""; ?>>TCP</option>
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<option value="!tcp" <?php if ($proto == "!tcp") echo "selected=\"selected\""; ?>>Exclude TCP</option>
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<option value="udp" <?php if ($proto == "udp") echo "selected=\"selected\""; ?>>UDP</option>
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<option value="!udp" <?php if ($proto == "!udp") echo "selected=\"selected\""; ?>>Exclude UDP</option>
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<option value="arp" <?php if ($proto == "arp") echo "selected=\"selected\""; ?>>ARP</option>
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<option value="!arp" <?php if ($proto == "!arp") echo "selected=\"selected\""; ?>>Exclude ARP</option>
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<option value="carp" <?php if ($proto == "carp") echo "selected=\"selected\""; ?>>CARP (VRRP)</option>
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<option value="!carp" <?php if ($proto == "!carp") echo "selected=\"selected\""; ?>>Exclude CARP (VRRP)</option>
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<option value="esp" <?php if ($proto == "esp") echo "selected=\"selected\""; ?>>ESP</option>
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</select>
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<br /><?=gettext("Select the protocol to capture, or Any.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Host Address");?></td>
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<td colspan="2" width="83%" class="vtable">
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<input name="host" class="formfld host" id="host" size="20" value="<?=htmlspecialchars($host);?>" />
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<br /><?=gettext("This value is either the Source or Destination IP address or subnet in CIDR notation. The packet capture will look for this address in either field.");?>
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<br /><?=gettext("Matching can be negated by preceding the value with \"!\". Multiple IP addresses or CIDR subnets may be specified. Comma (\",\") separated values perform a boolean \"and\". Separating with a pipe (\"|\") performs a boolean \"or\".");?>
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<br /><?=gettext("If you leave this field blank, all packets on the specified interface will be captured.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Port");?></td>
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<td colspan="2" width="83%" class="vtable">
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<input name="port" class="formfld unknown" id="port" size="5" value="<?=$port;?>" />
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<br /><?=gettext("The port can be either the source or destination port. The packet capture will look for this port in either field.");?>
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<br /><?=gettext("Leave blank if you do not want to filter by port.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Packet Length");?></td>
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<td colspan="2" width="83%" class="vtable">
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<input name="snaplen" class="formfld unknown" id="snaplen" size="5" value="<?=$snaplen;?>" />
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<br /><?=gettext("The Packet length is the number of bytes of each packet that will be captured. Default value is 0, which will capture the entire frame regardless of its size.");?>
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq"><?=gettext("Count");?></td>
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326
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<td colspan="2" width="83%" class="vtable">
|
|
327
|
<input name="count" class="formfld unknown" id="count" size="5" value="<?=$count;?>" />
|
|
328
|
<br /><?=gettext("This is the number of packets the packet capture will grab. Default value is 100.") . "<br />" . gettext("Enter 0 (zero) for no count limit.");?>
|
|
329
|
</td>
|
|
330
|
</tr>
|
|
331
|
<tr>
|
|
332
|
<td width="17%" valign="top" class="vncellreq"><?=gettext("Level of Detail");?></td>
|
|
333
|
<td colspan="2" width="83%" class="vtable">
|
|
334
|
<select name="detail" class="formselect" id="detail" size="1">
|
|
335
|
<option value="normal" <?php if ($detail == "normal") echo "selected=\"selected\""; ?>><?=gettext("Normal");?></option>
|
|
336
|
<option value="medium" <?php if ($detail == "medium") echo "selected=\"selected\""; ?>><?=gettext("Medium");?></option>
|
|
337
|
<option value="high" <?php if ($detail == "high") echo "selected=\"selected\""; ?>><?=gettext("High");?></option>
|
|
338
|
<option value="full" <?php if ($detail == "full") echo "selected=\"selected\""; ?>><?=gettext("Full");?></option>
|
|
339
|
</select>
|
|
340
|
<br /><?=gettext("This is the level of detail that will be displayed after hitting 'Stop' when the packets have been captured.") . "<br /><b>" .
|
|
341
|
gettext("Note:") . "</b> " .
|
|
342
|
gettext("This option does not affect the level of detail when downloading the packet capture.");?>
|
|
343
|
</td>
|
|
344
|
</tr>
|
|
345
|
<tr>
|
|
346
|
<td width="17%" valign="top" class="vncellreq"><?=gettext("Reverse DNS Lookup");?></td>
|
|
347
|
<td colspan="2" width="83%" class="vtable">
|
|
348
|
<input name="dnsquery" type="checkbox" <?php if ($_POST['dnsquery']) echo " checked=\"checked\""; ?> />
|
|
349
|
<br /><?=gettext("This check box will cause the packet capture to perform a reverse DNS lookup associated with all IP addresses.");?>
|
|
350
|
<br /><b><?=gettext("Note");?>: </b><?=gettext("This option can cause delays for large packet captures.");?>
|
|
351
|
</td>
|
|
352
|
</tr>
|
|
353
|
<tr>
|
|
354
|
<td width="17%" valign="top"> </td>
|
|
355
|
<td colspan="2" width="83%">
|
|
356
|
<?php
|
|
357
|
|
|
358
|
/* check to see if packet capture tcpdump is already running */
|
|
359
|
$processcheck = (trim(shell_exec("/bin/ps axw -O pid= | /usr/bin/grep tcpdump | /usr/bin/grep {$fn} | /usr/bin/egrep -v '(pflog|grep)'")));
|
|
360
|
|
|
361
|
if ($processcheck != "") {
|
|
362
|
$processisrunning = true;
|
|
363
|
} else {
|
|
364
|
$processisrunning = false;
|
|
365
|
}
|
|
366
|
|
|
367
|
if (($action == gettext("Stop") or $action == "") and $processisrunning != true) {
|
|
368
|
echo "<input type=\"submit\" name=\"startbtn\" value=\"" . gettext("Start") . "\" /> ";
|
|
369
|
} else {
|
|
370
|
echo "<input type=\"submit\" name=\"stopbtn\" value=\"" . gettext("Stop") . "\" /> ";
|
|
371
|
}
|
|
372
|
if (file_exists($fp.$fn) and $processisrunning != true) {
|
|
373
|
echo "<input type=\"submit\" name=\"viewbtn\" value=\"" . gettext("View Capture") . "\" /> ";
|
|
374
|
echo "<input type=\"submit\" name=\"downloadbtn\" value=\"" . gettext("Download Capture") . "\" />";
|
|
375
|
echo "<br />" . gettext("The packet capture file was last updated:") . " " . date("F jS, Y g:i:s a.", filemtime($fp.$fn));
|
|
376
|
}
|
|
377
|
?>
|
|
378
|
</td>
|
|
379
|
</tr>
|
|
380
|
</table>
|
|
381
|
</form>
|
|
382
|
<table width="100%" border="0" cellpadding="6" cellspacing="0" summary="results">
|
|
383
|
<tr>
|
|
384
|
<td valign="top" colspan="2">
|
|
385
|
<?php
|
|
386
|
echo "<font face=\"terminal\" size=\"2\">";
|
|
387
|
if ($processisrunning == true) {
|
|
388
|
echo("<strong>" . gettext("Packet Capture is running.") . "</strong><br />");
|
|
389
|
}
|
|
390
|
|
|
391
|
if ($do_tcpdump) {
|
|
392
|
$matches = array();
|
|
393
|
|
|
394
|
if (in_array($fam, $fams)) {
|
|
395
|
$matches[] = $fam;
|
|
396
|
}
|
|
397
|
|
|
398
|
if (in_array($proto, $protos)) {
|
|
399
|
$matches[] = fixup_not($proto);
|
|
400
|
}
|
|
401
|
|
|
402
|
if ($port != "") {
|
|
403
|
$matches[] = "port ".fixup_not($port);
|
|
404
|
}
|
|
405
|
|
|
406
|
if ($host != "") {
|
|
407
|
$hostmatch = "";
|
|
408
|
$hostcount = 0;
|
|
409
|
foreach ($hosts as $h) {
|
|
410
|
$h = fixup_host($h, $hostcount++);
|
|
411
|
if (!empty($h)) {
|
|
412
|
$hostmatch .= " " . $h;
|
|
413
|
}
|
|
414
|
}
|
|
415
|
if (!empty($hostmatch)) {
|
|
416
|
$matches[] = "({$hostmatch})";
|
|
417
|
}
|
|
418
|
}
|
|
419
|
|
|
420
|
if ($count != "0" ) {
|
|
421
|
$searchcount = "-c " . $count;
|
|
422
|
} else {
|
|
423
|
$searchcount = "";
|
|
424
|
}
|
|
425
|
|
|
426
|
$selectedif = convert_friendly_interface_to_real_interface_name($selectedif);
|
|
427
|
|
|
428
|
if ($action == gettext("Start")) {
|
|
429
|
$matchstr = implode($matches, " and ");
|
|
430
|
echo("<strong>" . gettext("Packet Capture is running.") . "</strong><br />");
|
|
431
|
$cmd = "/usr/sbin/tcpdump -i {$selectedif} {$disablepromiscuous} {$searchcount} -s {$snaplen} -w {$fp}{$fn} " . escapeshellarg($matchstr);
|
|
432
|
// Debug
|
|
433
|
//echo $cmd;
|
|
434
|
mwexec_bg ($cmd);
|
|
435
|
} else {
|
|
436
|
//action = stop
|
|
437
|
echo("<strong>" . gettext("Packet Capture stopped.") . "<br /><br />" . gettext("Packets Captured:") . "</strong><br />");
|
|
438
|
?>
|
|
439
|
<script type="text/javascript">
|
|
440
|
//<![CDATA[
|
|
441
|
window.onload=function() {
|
|
442
|
document.getElementById("packetsCaptured").wrap='off';
|
|
443
|
}
|
|
444
|
//]]>
|
|
445
|
</script>
|
|
446
|
<textarea id="packetsCaptured" style="width:98%" name="code" rows="15" cols="66" readonly="readonly">
|
|
447
|
<?php
|
|
448
|
$detail_args = "";
|
|
449
|
switch ($detail) {
|
|
450
|
case "full":
|
|
451
|
$detail_args = "-vv -e";
|
|
452
|
break;
|
|
453
|
case "high":
|
|
454
|
$detail_args = "-vv";
|
|
455
|
break;
|
|
456
|
case "medium":
|
|
457
|
$detail_args = "-v";
|
|
458
|
break;
|
|
459
|
case "normal":
|
|
460
|
default:
|
|
461
|
$detail_args = "-q";
|
|
462
|
break;
|
|
463
|
}
|
|
464
|
system("/usr/sbin/tcpdump {$disabledns} {$detail_args} -r {$fp}{$fn}");
|
|
465
|
|
|
466
|
conf_mount_ro();
|
|
467
|
?>
|
|
468
|
</textarea>
|
|
469
|
<?php
|
|
470
|
}
|
|
471
|
}
|
|
472
|
?>
|
|
473
|
</font>
|
|
474
|
</td>
|
|
475
|
</tr>
|
|
476
|
</table>
|
|
477
|
</td></tr>
|
|
478
|
</table>
|
|
479
|
|
|
480
|
<?php
|
|
481
|
include("fend.inc");
|
|
482
|
?>
|
|
483
|
</body>
|
|
484
|
</html>
|
