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Re: [lwip-users] Reassemble fragmented TCP packets

From: Baptiste Chaboud-crousaz
Subject: Re: [lwip-users] Reassemble fragmented TCP packets
Date: Thu, 27 Aug 2009 15:33:51 +0200
User-agent: Internet Messaging Program (IMP) H3 (4.1.6)


Thanks you very much for that clarifications. It is really helpful to understand where I should do something to fix my problem: the HTTP server.

Is there a way, by using another API than RAW API, to have TCP behaves as I expect? If yes which API should I use?


Baptiste Chaboud-Crousaz

Quoting Mike Kleshov <address@hidden>:

> 2009/8/27 Baptiste Chaboud-crousaz <address@hidden>:
>> Nevertheless, lwip is not able to reassemble the both frames. As a result,
>> my HTTP server receive it separetely: first frame = the header; second
>> frame=the data. That 's not what it was expected!!!! I want lwip reassemble
>> the both TCP segments before providing it the HTTP server.
> That's not how lwip is designed to work. If you are using the raw API,
> lwip passes data to your application in chunks, as they arrive. Your
> application is responsible for interpreting the data, however small or
> large the chunks may be.
> In fact, the simple HTTP server in contrib is cheating here: it
> expects the HTTP request to be contained in a single pbuf, which is
> true most of the time. However, it is perfectly legal to send an HTTP
> request in many small packets (with 1-byte payload each, in an extreme
> case) and the simple HTTP server provided will fail to process such
> request correctly. You can realize such scenario using a telnet client
> to send an HTTP request: the telnet client sends data 1 byte at a time
> as you type it.
> Regards,
> - mike
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