[erlang-questions] Low Level Socket Example

[David Mitchell]

If you want a very powerful network toolkit that can do just about
anything conceivable, check out Scapy
(http://www.secdev.org/projects/scapy/).

It's Python, not Erlang, but I doubt that a more
capable/extensible/powerful network toolkit exists short of getting
into e.g. Linux kernel code and tweaking it.

Regards

Dave M.

2008/8/13 Serge Aleynikov <saleyn@REDACTED>:
> If you are interested in learning the details of network protocols,
> Erlang could be your friend for the task as a rapid prototyping
> framework.  You have to be aware though that a TCP stack in Erlang will
> not deliver the same performance as the kernel-level stack
> implementation.  However it is doable as a proof of concept.
>
> The network driver that comes with Erlang is not suited for this task,
> as it serves as a bridge between TCP/SCTP/UDP protocols and the
> emulator.  So if you really have interest in accessing raw sockets,
> you'd need to write a driver in C/C++  to marshal raw packets between
> user-level POSIX API and an Erlang process.
>
> Serge
>
> Marc Eisenbarth wrote:
>>> Why can't you use gen_tcp? Do you really need to implement OS level APIs
>>> in
>>> Erlang? Erlang really isn't the right language for raw socket
>>> manipulation.
>>> Try out C.
>>
>> gen_tcp will do the entire TCP session setup for me, so it's not appropriate for my task. Just because C might be better for this task, doesn't mean it's better for the rest of my program. In fact, there's are at least 2 examples of projects that implement network stacks in Erlang, so at least a few people out there that would disagree with you and instead agree that there is some merit in using Erlang :)
>
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