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<?php
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/*
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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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$pgtitle = array("Diagnostics", "Packet Capture");
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require_once("guiconfig.inc");
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require_once("pfsense-utils.inc");
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$fp = "/usr/local/www/";
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$fn = "packetcapture.cap";
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$snaplen = 1500;//default packet length
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$count = 100;//default number of packets to capture
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function get_interface_addr($if) {
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global $config;
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$ifdescr = convert_friendly_interface_to_friendly_descr($if);
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/* find out interface name */
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if ($ifdescr == "wan")
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$if = get_real_wan_interface();
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else
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$if = $config['interfaces'][$ifdescr];
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return $if;
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}
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if ($_POST) {
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$do_tcpdump = true;
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$host = $_POST['host'];
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$selectedif = $_POST['interface'];
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$count = $_POST['count'];
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$packetlength = $_POST['snaplen'];
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$port = $_POST['port'];
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$detail = $_POST['detail'];
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if ($_POST['dnsquery'])//if dns lookup is checked
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{
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$disabledns = "";
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}
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else //if dns lookup is unchecked
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{
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$disabledns = "-n";
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}
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if ($_POST['startbtn'] != "" )
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{
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$action = "Start";
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}
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elseif ($_POST['stopbtn']!= "")
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{
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$action = "Stop";
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$processes_running = trim(shell_exec("ps axw -O pid= | grep tcpdump | grep $fn"));
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//explode processes into an array, (delimiter is new line)
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$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 $process)
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{
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$process_id_pos = strpos($process, ' ');
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$process_id = substr($process, 0, $process_id_pos);
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exec("kill $process_id");
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}
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}
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else //download file
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{
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$fs = filesize($fn);
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header("Content-Type: application/octet-stream");
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header("Content-Disposition: attachment; filename=$fn");
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header("Content-Length: $fs");
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readfile($fp.$fn);
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}
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}
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else
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{
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$do_tcpdump = false;
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}
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$pgtitle = "Diagnostics: Packet Capture";
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include("head.inc"); ?>
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<body link="#000000" vlink="#0000CC" alink="#0000CC">
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<? include("fbegin.inc"); ?>
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<p class="pgtitle"><?=$pgtitle?></p>
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<table width="100%" border="0" cellpadding="0" cellspacing="0">
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<tr>
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<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">
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<tr>
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<td width="17%" valign="top" class="vncellreq">Interface</td>
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<td width="83%" class="vtable">
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<select name="interface" class="formfld">
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<?php $interfaces = array('wan' => 'WAN', 'lan' => 'LAN');
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for ($i = 1; isset($config['interfaces']['opt' . $i]); $i++) {
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if (isset($config['interfaces']['opt' . $i]['enable']) &&
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!$config['interfaces']['opt' . $i]['bridge'])
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$interfaces['opt' . $i] = $config['interfaces']['opt' . $i]['descr'];
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}
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foreach ($interfaces as $iface => $ifacename): ?>
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<option value="<?=$iface;?>" <?php if ($selectedif == $iface) echo "selected"; ?>>
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<?php echo $ifacename;?>
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</option>
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<?php endforeach;?>
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</select>
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<br>Select the interface the traffic will be passing through. Typically this will be the WAN interface.
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq">Host Address</td>
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<td width="83%" class="vtable">
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<input name="host" type="text" class="formfld" id="host" size="20" value="<?=htmlspecialchars($host);?>">
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<br>This value is either the Source or Destination IP address. The packet capture will look for this address in either field.
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<br>This value can be a domain name or IP address.
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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">Port</td>
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<td width="83%" class="vtable">
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<input name="port" type="text" class="formfld" id="port" size="5" value="<?=$port;?>">
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<br>The port can be either the source or destination port. The packet capture will look for this port in either field.
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<br>Leave blank if you do not want to the capture to filter by port.
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq">Packet Length</td>
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<td width="83%" class="vtable">
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<input name="snaplen" type="text" class="formfld" id="snaplen" size="5" value="<?=$snaplen;?>">
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<br>The Packet length is the number of bytes the packet will capture for each payload. Default value is 1500.
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<br>This value should be the same as the MTU of the Interface selected above.
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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">Count</td>
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<td width="83%" class="vtable">
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<input name="count" type="text" class="formfld" id="count" size="5" value="<?=$count;?>">
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<br>This is the number of packets the packet capture will grab. Default value is 100.
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq">Level of Detail</td>
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<td width="83%" class="vtable">
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<select name="detail" type="text" class="formfld" id="detail" size="1">
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<option value="-q" <?php if ($detail == "-q") echo "selected"; ?>>Normal</option>
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<option value="-v" <?php if ($detail == "-v") echo "selected"; ?>>Medium</option>
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<option value="-vv" <?php if ($detail == "-vv") echo "selected"; ?>>High</option>
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<option value="-vv -e" <?php if ($detail == "-vv -e") echo "selected"; ?>>Full</option>
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</select>
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<br>This is the level of detail that will be displayed after hitting 'Stop' when the packets have been captured. <br><b>Note:</b> This option does not affect the level of detail when downloading the packet capture.
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</tr>
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<tr>
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<td width="17%" valign="top" class="vncellreq">Reverse DNS Lookup</td>
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<td width="83%" class="vtable">
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<input name="dnsquery" type="checkbox"<?php if($_POST['dnsquery']) echo " CHECKED"; ?>>
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<br>This check box will cause the packet capture to perform a reverse DNS lookup associated with all IP addresses.
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<br><b>Note: </b>This option can be CPU intensive for large packet captures.
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</td>
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</tr>
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<tr>
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<td width="17%" valign="top"> </td>
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<td width="83%">
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<?php
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/*check to see if packet capture tcpdump is already running*/
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$processcheck = (trim(shell_exec("ps axwu | grep tcpdump | grep -v 'grep' | grep -i $fn")));
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$processisrunning = False;
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if ($processcheck != False)
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$processisrunning = True;
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if (($action == "Stop" or $action == "") and $processisrunning != True)
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echo "<input type=\"submit\" name=\"startbtn\" value=\"Start\"> ";
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else
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echo "<input type=\"submit\" name=\"stopbtn\" value=\"Stop\"> ";
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if (file_exists($fp.$fn)){
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echo "<input type=\"submit\" name=\"downloadbtn\" value=\"Download Capture\">";
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echo " (The packet capture file was last updated: " . date("F jS, Y g:i:s a.", filemtime($fp.$fn)) . ")";
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}
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?>
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</td>
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</tr>
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<tr>
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<td valign="top" colspan="2">
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<?php
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if ($do_tcpdump) {
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echo "<font face='terminal' size='2'>";
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if ($port != "")
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{
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$searchport = "and port ".$port;
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}
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else
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{
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$searchport = "";
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}
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$selectedif = convert_friendly_interface_to_real_interface_name($selectedif);
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if ($action == "Start")
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{
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//delete previous packet capture if it exists
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if (file_exists($fp.$fn))
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unlink ($fp.$fn);
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echo("<strong>Packet Capture is running.</strong><br>");
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exec ("/usr/sbin/tcpdump -i $selectedif -v -c $count -s $packetlength -w $fn host $host $searchport");
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}
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else //action = stop
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{
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echo("<strong>Packet Capture stopped. <br><br>Packets Captured:</strong><br>");
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?>
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<textarea style="width:98%" name="code" rows="15" cols="66" wrap="off" readonly="readonly">
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<?php
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system ("/usr/sbin/tcpdump $disabledns $detail -r $fn");?>
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</textarea><?php
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}
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}
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if ($processisrunning)
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echo("<strong>Packet Capture is running.</strong><br>");?>
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</td>
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</tr>
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<tr>
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</table>
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</form>
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</td></tr></table>
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<?php include("fend.inc"); ?>
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