Need help with LEASEQUERY..continued
Matt Pascoe
hornet136 at gmail.com
Fri May 21 16:16:00 UTC 2010
One thought for comparison.. try using the perl leasequery tool to see if
you see it generating the same packet on the wire.
I have tried the perl tool before and was never able to get it working
either. I'm wondering if there is a common issue here (probably me not
getting it to work right either way :)
I went as far as trying to get a perl cli tool to work for what I needed so
that I could just "exec" it from within PHP. This was not ideal of course
but I never got either one working.
Just a thought... I'd work on it too but I'm seriously swamped at work right
now. Hopefully that will get better soon............
Thanks.
On Fri, May 21, 2010 at 9:12 AM, Pat Winn <ptwinn at cimtel.net> wrote:
> All,
> I have gotten as far as to send a packet which in my WireShark
> packet trace..at least..LOOKS to me like it *should* be correct.
> Yet, I still receive no response.
>
> The code snippet I'm attaching is but a simple single file
> with the basic code needed to construct and send a DHCPLEASEQUERY
> packet in PHP. It will send the packet but not listen for a
> response. As yet, I'm only watching the server output, server logs
> and WireShark packet sniff/traces to see what is going back and
> forth over the wire.
>
> The packet goes out, looks good but as I mentioned above, the
> server never responds to it. Either I'm still off on something
> in the packet or something is not right in the server?
> (running 4.1.1 freshly compiled).
>
> The code (real IP's replaced with dummys of course..):
> (sorry if my web mail client borks up the formatting)..
>
> #!/usr/bin/php -e
> <?
>
> $packet = Array();
>
> $packet['op'] = '01';
> $packet['htype'] = '00';
> $packet['hlen'] = '00';
> $packet['hops'] = '00';
> $packet['xid'] = '12345678';
> $packet['secs'] = '0005';
> $packet['flags'] = '0000';
> $packet['ciaddr'] = ip2hex("1.2.3.4");
> $packet['yiaddr'] = ip2hex("0.0.0.0");
> $packet['siaddr'] = ip2hex("0.0.0.0");
> $packet['giaddr'] = ip2hex("1.2.5.1");
> $packet['chaddr'] = '00000000000000000000000000000000';
> $packet['sname'] =
>
> '00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000';
> $packet['file'] =
>
> '0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000';
> $packet['magic'] = '63825363';
> $packet['options'] = int2hex(53) . int2hex(1) . int2hex(10); //
> DHCPLEASEQUERY packet type
> $packet['options'] .= int2hex(55) . int2hex(2) . int2hex(58);
> $packet['options'] .= int2hex(82) . int2hex(255);
>
> $myPacket = pack("H2H2H2H2H8H4H4H8H8H8H8H32H128H256H8H*",
> $packet['op'], $packet['htype'], $packet['hlen'], $packet['hops'],
> $packet['xid'],
> $packet['secs'], $packet['flags'], $packet['ciaddr'],
> $packet['yiaddr'], $packet['siaddr'],
> $packet['giaddr'], $packet['chaddr'], $packet['sname'], $packet['file'],
> $packet['magic'], $packet['options']);
>
> $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
> socket_set_option($socket, SOL_SOCKET, SO_BROADCAST, 1);
> socket_bind($socket, "1.2.5.1", 68);
>
> $error = socket_sendto($socket, $myPacket, strlen($myPacket), 0,
> '1.2.5.1', 67);
>
> if ($error === FALSE) {
> print("Send failed for address");
> print_r("ERROR: ". $error ." while trying to send.");
> } else {
> echo "Sent ". $error ." bytes\n";
> }
>
> // convert a string to hex values
> function str2hex($s) {
> $hex = '';
> for ($i = 0 ; $i < strlen($s); $i++) {
> $hex .= dechex(ord($s[$i]));
> }
>
> return($hex);
> }
>
> // convert an ip address to hex values
> function ip2hex($ip) {
> $t = explode(".", $ip);
> return int2hex($t[0]) . int2hex($t[1]) . int2hex($t[2]) .
> int2hex($t[3]);
> }
>
> // convert an int value to 0 padded hex value
> function int2hex($int) {
> $hex = base_convert($int, 10, 16);
>
> switch(strlen($hex)) {
> case 1:
> case 3:
> case 7: $hex = '0' . $hex; break;
> case 5: $hex = '000' . $hex; break;
> }
>
> return $hex;
> }
>
> ?>
>
>
> ..and then, the packet trace (what was actually sent):
>
> No. Time Source Destination Protocol
> Info
> 104942 1994.263153 1.2.5.1 1.2.5.1 DHCP DHCP Lease
> query - Transaction ID 0x12345678
>
> Frame 104942 (292 bytes on wire, 292 bytes captured)
> Arrival Time: May 21, 2010 09:56:26.129252000
> [Time delta from previous captured frame: 0.000276000 seconds]
> [Time delta from previous displayed frame: 1.795716000 seconds]
> [Time since reference or first frame: 1994.263153000 seconds]
> Frame Number: 104942
> Frame Length: 292 bytes
> Capture Length: 292 bytes
> [Frame is marked: False]
> [Protocols in frame: sll:ip:udp:bootp]
> [Coloring Rule Name: UDP]
> [Coloring Rule String: udp]
> Protocol: IP (0x0800)
> Internet Protocol, Src: 1.2.5.1 (1.2.5.1), Dst: 1.2.5.1 (1.2.5.1)
> Version: 4
> Header length: 20 bytes
> Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
> 0000 00.. = Differentiated Services Codepoint: Default (0x00)
> .... ..0. = ECN-Capable Transport (ECT): 0
> .... ...0 = ECN-CE: 0
> Total Length: 276
> Identification: 0x0000 (0)
> Flags: 0x04 (Don't Fragment)
> 0... = Reserved bit: Not set
> .1.. = Don't fragment: Set
> ..0. = More fragments: Not set
> Fragment offset: 0
> Time to live: 64
> Protocol: UDP (0x11)
> Header checksum: 0x7ffb [correct]
> [Good: True]
> [Bad : False]
> Source: 1.2.5.1 (1.2.5.1)
> Destination: 1.2.5.1 (1.2.5.1)
> User Datagram Protocol, Src Port: bootpc (68), Dst Port: bootps (67)
> Source port: bootpc (68)
> Destination port: bootps (67)
> Length: 256
> Checksum: 0xd472 [correct]
> [Good Checksum: True]
> [Bad Checksum: False]
> Bootstrap Protocol
> Message type: Boot Request (1)
> Hardware type: NET/ROM pseudo
> Hardware address length: 0
> Hops: 0
> Transaction ID: 0x12345678
> Seconds elapsed: 5
> Bootp flags: 0x0000 (Unicast)
> 0... .... .... .... = Broadcast flag: Unicast
> .000 0000 0000 0000 = Reserved flags: 0x0000
> Client IP address: 1.2.3.4 (1.2.3.4)
> Your (client) IP address: 0.0.0.0 (0.0.0.0)
> Next server IP address: 0.0.0.0 (0.0.0.0)
> Relay agent IP address: 1.2.5.1 (1.2.5.1)
> Client address not given
> Server host name not given
> Boot file name not given
> Magic cookie: (OK)
> Option: (t=53,l=1) DHCP Message Type = DHCP Lease query
> Option: (53) DHCP Message Type
> Length: 1
> Value: 0A
> Option: (t=55,l=2) Parameter Request List
> Option: (55) Parameter Request List
> Length: 2
> Value: 3A52
> 58 = Renewal Time Value
> 82 = Agent Information Option
> End Option
>
>
> Umm....help?
>
> Thanks again for any help offered!!
>
>
> --
> Patrick T. Winn
> Systems Engineer
> Cimarron Telephone Co.
> (918) 865-3311 x280 - office
> (918) 606-6602 - cell
>
>
>
> _______________________________________________
> dhcp-hackers mailing list
> dhcp-hackers at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-hackers
>
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