[Gllug] OT: reading from a socket in php

[salsaman at xs4all.nl]

On Wed, October 6, 2010 13:13, Robert McKay wrote:
> On Wed, Oct 6, 2010 at 6:14 AM, <salsaman at xs4all.nl> wrote:
>
>> I should explain a bit more perhaps. The php script sends a trigger to a
>> running process which makes the process open a send port on udp 9998.
>> The
>> php script should then connect to the other end of the socket and read
>> the
>> return data which is being sent. The data is terminated with a NULL
>> byte.
>>
>
>> Data can be read using nc -l -u 9998, and via a perl script. Tcpdump
>> also
>> shows the process responding with 6 bytes on udp 9998.
>>
>
> The socket you create and connect to port 9998 is expecting to receive
> packets FROM another socket on localhost using a source port of 9998. The
> packets should come from localhost:9998 and go to
> localhost:<ephemeral-source-port>.
>
> The ephemeral source port is assigned randomly from the free pool of
> ports.
> The way this code is written the 'server' side of the connection should be
> sending traffic to this randomly assigned ephemeral source port. I expect
> that you probably aren't doing this. Most likely you are sending the
> traffic
> to localhost:9998 - but this is the source not the destination of your php
> client.
>
> Most likely what you should do is use
>
> http://php.net/manual/en/function.socket-bind.php
>
> where you are using sock_connect() so that the socket expects to receive
> traffic going to port 9998 instead of traffic coming from port 9998.
>
> Rob
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Aha ! I have seen the light !

:-)

Salsaman.


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