From 9f64f4f28bdc50df6736420272d2eb8647ba175e Mon Sep 17 00:00:00 2001
From: sleepy <sleepy@sleepy-PC>
Date: Fri, 5 Feb 2021 11:37:40 +1000
Subject: [PATCH] =?utf8?q?=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB=D0=B5=D0=BD?=
 =?utf8?q?=20=D0=BF=D1=80=D0=BE=D1=82=D0=BE=D1=82=D0=B8=D0=BF=20=D0=B1?=
 =?utf8?q?=D0=B8=D0=B1=D0=BB=D0=B8=D0=BE=D1=82=D0=B5=D0=BA=D0=B8=20DHCP?=
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit

---
 dhcplib.php | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 dhcplib.php

diff --git a/dhcplib.php b/dhcplib.php
new file mode 100644
index 0000000..5c86432
--- /dev/null
+++ b/dhcplib.php
@@ -0,0 +1,142 @@
+<?php
+$dhcp = new dhcp_proto(); 
+$socket = stream_socket_server("udp://0.0.0.0:67", $errno, $errstr, STREAM_SERVER_BIND);
+if (!$socket) {
+    die("$errstr ($errno)");
+}
+
+do {
+    $pkt = stream_socket_recvfrom($socket, 1500, 0, $peer);
+    echo "$peer: \n";
+    $dhcp->parse($pkt);
+    exit();
+} while ($pkt !== false);
+
+class dhcp_proto
+{
+
+    public function parse($packet)
+    {
+	$parse = unpack('Cop/Chtype/Chlen/Chops/Ixid/nsecs/nflags/Iciaddr/Iyiaddr/Isiaddr/Igiaddr/H32chaddr/Z64sname/Z128file/H8magic/a*options',$packet);
+	var_dump($parse);
+	$opt_stack = $parse['options'];
+	$OPTS = [];
+	$stopflag = FALSE;
+	$DHCPOptions = [];
+	do
+	{
+	    $optnum = unpack('C', $opt_stack);
+	    if ($optnum[1] == 255)
+	    {
+		break;
+	    }
+	    if ($optnum[1] == 0)
+	    {
+		continue;
+	    }
+	    $opt_stack = substr($opt_stack, 1);
+	    $optsize = unpack('C', $opt_stack);
+	    $opt_stack = substr($opt_stack, 1);	    
+	    $optpayload = unpack('a'.$optsize[1], $opt_stack);
+    	    $opt_stack = substr($opt_stack, $optsize[1]);
+	    var_dump($optnum[1], $optpayload[1]);
+	    $DHCPOptions[] = $this->OptDictonaryPostprocessor($optnum[1], $optpayload[1]);
+	}
+	while (strlen($opt_stack) > 0);
+		
+	var_dump($DHCPOptions);
+    }
+    protected function OptDictonaryPostprocessor($opt,$payload)
+    {
+	switch ($opt)
+	{
+	    case 1:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'SubnetMask';
+		$tmp = long2ip(unpack('N',$payload));
+		$DecodedOption['data'] = $tmp[1];
+		break;
+	    case 12:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'HostName';
+		$DecodedOption['data'] = $payload;
+		break;
+
+	    case 53:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'DhcpPacketType';
+		$type = unpack('C',$payload);
+		switch ($type[1])
+		{
+		    case 1:
+		    {    
+			$DecodedOption['data'] = 'DHCPDISCOVER';
+			break;
+		    }
+		    case 2:
+		    {    
+			$DecodedOption['data'] = 'DHCPOFFER';
+			break;
+		    }
+		    case 3:
+		    {    
+			$DecodedOption['data'] = 'DHCPREQUEST';
+			break;
+		    }
+		    case 4:
+		    {    
+			$DecodedOption['data'] = 'DHCPDECLINE';
+			break;
+		    }
+		    case 5:
+		    {    
+			$DecodedOption['data'] = 'DHCPACK';
+			break;
+		    }
+		    case 6:
+		    {    
+			$DecodedOption['data'] = 'DHCPNAK';
+			break;
+		    }
+		    case 7:
+		    {    
+			$DecodedOption['data'] = 'DHCPRELEASE';
+			break;
+		    }
+		    case 8:
+		    {    
+			$DecodedOption['data'] = 'DHCPINFORM';
+			break;
+		    }
+		    case 9:
+		    {    
+			$DecodedOption['data'] = 'RESERVED';
+			break;
+		    }
+		    case 0:
+		    {    
+			$DecodedOption['data'] = 'RESERVED';
+			break;
+		    }
+		}
+		break;
+	    case 55:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'RequestOptionCodes';
+		$DecodedOption['data'] = unpack('C*',$payload);
+		break;
+	    case 61:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'ClientIdentifier';
+		$tmp = unpack('H*',$payload);
+		$DecodedOption['data'] = $tmp[1];
+		break;
+	    default:
+		$DecodedOption['number'] = $opt;
+		$DecodedOption['name'] = 'UnsupportedOption';
+		$DecodedOption['data'] = FALSE;
+		break;
+	}
+	return $DecodedOption;
+    }
+}
\ No newline at end of file
-- 
2.39.5