[erlang-questions] low level packet access from erlang

Garry Hodgson <>
Tue Jun 4 15:10:05 CEST 2013

forgot to mention, i'm running erlang R15B02
on CentOs 6.2

On 06/04/2013 09:08 AM, Garry Hodgson wrote:
> On 04/03/2013 05:24 PM, Michael Santos wrote:
>> I wrote an Erlang tun/tap interface on top of procket:
>> https://github.com/msantos/tunctl
> i've been playing with tunctl, but can't seem to get
> it past initial eperm problems in create(). i'm guessing
> i missed some kind of setup step, but i don't know what.
> i set the capabilities as per instructions:
> --> getcap /usr/local/lib/erlang/erts-5.9.2/bin/beam.smp 
> /usr/local/lib/erlang/erts-5.9.2/bin/beam
> /usr/local/lib/erlang/erts-5.9.2/bin/beam.smp = cap_net_admin+ep
> /usr/local/lib/erlang/erts-5.9.2/bin/beam = cap_net_admin+ep
> running as root, when i try tuncer:create() with or without args, i get:
> ()2> tuncer:create( <<"tun0">> ).
> ** exception exit: {badmatch,{error,eperm}}
>      in function  tuncer:init/1
>      in call from gen_server:init_it/6 (gen_server.erl, line 304)
>      in call from proc_lib:init_p_do_apply/3 (proc_lib.erl, line 227)
> ()3>
> =CRASH REPORT==== 4-Jun-2013::08:28:13 ===
>   crasher:
>     initial call: tuncer:init/1
>     pid: <0.64.0>
>     registered_name: []
>     exception exit: {{badmatch,{error,eperm}},
>                      [{tuncer,init,1,[]},
>                       {gen_server,init_it,6,
> any idea what i may be missing?

Garry Hodgson
AT&T Chief Security Office (CSO)

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