Question about memory in C

[Victor Detoni]

Hi,

Thank you for your tip! I really appreciate it. In my situation I will have
many profiles and for each profile I can have many ip address, for example:

profile 1:
192.168.0.0/24
192.168.1.2/32
192.168.14/23
...

profile 2:
10.10.10.0/24
10.11.12.0/23
...

What's your opinion? I'm thinking to use pcap library, but I still haven't
the key.

On Wed, Feb 10, 2016 at 7:25 PM, Cihangir Akturk <cakturk at gmail.com> wrote:

> On Wed, Feb 10, 2016 at 11:40:44AM -0200, Victor Detoni wrote:
> > Hi all,
> >
> > I'm working for a network security prototype and I would like to know the
> > best way to read diferent configs from the memory, for example:
> >
> > My program will receive many pkts from network interface and it needs to
> > know what's profile it will use based on source ip address.
> >
> > First all, I'm thinking to use array in C, for example:
> >
> > for (i=0;i<=PROFILES;i++) {
> >     if (pkt.ip_addr == source_ip[i])
> >         do_something(pkt,i)
> > }
> >
> > I will process at about millions entries per second and ~100 profiles.
> What
> > do you think? It will work fine? fast? any suggest?
> >
> > thanks
> > Victor
>
> Hi Victor,
>
> I would consider using a simple hash table. Use ipaddr as a key to
> do fast lookup of the value. Take a look at scripts/fixdep.c which
> includes a FNV hash table implementation.
>
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