#42624 [Opn->Fbk]: fwrite to a Stream create a wrong checksum

From: Date: Wed, 12 Sep 2007 11:54:40 +0000
Subject: #42624 [Opn->Fbk]: fwrite to a Stream create a wrong checksum
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-117446@lists.php.net to get a copy of this message 
 ID:               42624
 Updated by:       jani@php.net
 Reported By:      philipp at caha dot info
-Status:           Open
+Status:           Feedback
 Bug Type:         Streams related
 Operating System: Linux
 PHP Version:      5.2.4
 New Comment:

See "Example 2368. Using TCP server sockets" on page:

http://www.php.net/stream_socket_server

Try with that example. And make sure there aren't any
firewalls/proxies/etc. interfering.


Previous Comments:
------------------------------------------------------------------------

[2007-09-11 17:28:30] philipp at caha dot info

Description:
------------
I write Data to a Socket, but it comes some incorrect checksum (dump
with tcpdump)

Dump :

00:16:76:df:12:eb (oui Unknown) > 00:04:23:c1:72:23 (oui Unknown),
ethertype IPv4 (0x0800), length 64: (tos 0x0, ttl  64, id 63018, offset
0, flags [DF], proto: TCP (6), length: 50) 10.10.1.22.dnsix >
mk089144217176.a1.net.sbl: P, cksum 0x3e85 (incorrect (-> 0x261b),
1:11(10) ack 118 win 5840 urg 10
        0x0000:  4500 0032 f62a 4000 4006 063b 0a0a 0116
        0x0010:  5990 d9b0 005a 040f 1cc2 054c 0005 0ecc
        0x0020:  5038 16d0 3e85 000a 3031 3334 3036 3936
        0x0030:  3233

Reproduce code:
---------------
$socket = stream_socket_server('tcp://10.10.1.22:90', $errno,
$errstr);
$conn = @stream_socket_accept($socket, 1);
$message = fread($conn, 8192);
$answer = "0134069623";
fwrite($conn, $answer);
fclose ($conn);
fclose($socket);



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