[erlang-questions] Strange SSL transport_accept behaviour

Trevor Woollacott <>
Mon May 7 17:36:13 CEST 2012


Hi Ingela,

Thank you

Regards,
Trevor

> -----Original Message-----
> From: Ingela Andin [mailto:]
> Sent: 07 May 2012 04:12 PM
> To: Trevor Woollacott
> Subject: Re: [erlang-questions] Strange SSL transport_accept behaviour
> 
> Hi!
> 
> I think you are correct, its a bug we will fix it.
> 
> Regards Ingela Erlang/OTP team - Ericsson AB
> 
> 2012/5/4, Trevor Woollacott <>:
> > Hi,
> >
> > I've noticed strange behaviour when ssl:transport_accept/2 returns
> > with a timeout. It appears that certain inet options are reset to
> > internal values and are never changed back if accept encounters an
> error (such as timeout).
> >
> > In my case, I had set inet option {packet, http}, and after the
> accept
> > timed out it had changed to 0 (raw).
> >
> > For example:
> >> ssl:setopts( ListenSocket, [{packet, http}] ).
> > ok
> >> ssl:transport_accept( ListenSocket, Timeout ).
> > {error, timeout}
> >> ssl:getopts( ListenSocket, [packet] ).
> > {ok, [{packet,0}]}
> >
> > The problem seems to have been introduced in Erlang R14B. Looking at
> > the source code below, we can see that the initial inet options are
> > stored in InetValues, and then the inet options are reset to
> > internal_inet_values (which includes {packet,0}) and the inet options
> > are only set back to InetValues if the accept was successful.
> >
> > Is this the correct behaviour? I'm thinking that for timeout (and
> > possibly certain other errors) the listener socket should be reset
> > with the user defined inet options?
> >
> > transport_accept(#sslsocket{pid = {ListenSocket, #config{cb=CbInfo,
> > ssl=SslOpts}},
> >                             fd = new_ssl}, Timeout) ->
> >
> >     %% The setopt could have been invoked on the listen socket
> >     %% and options should be inherited.
> >     EmOptions = emulated_options(),
> >     {ok, InetValues} = inet:getopts(ListenSocket, EmOptions),
> >     ok = inet:setopts(ListenSocket, internal_inet_values()),
> >     {CbModule,_,_, _} = CbInfo,
> >     case CbModule:accept(ListenSocket, Timeout) of
> >     {ok, Socket} ->
> >         ok = inet:setopts(ListenSocket, InetValues),
> >         {ok, Port} = inet:port(Socket),
> >         ConnArgs = [server, "localhost", Port, Socket,
> >             {SslOpts, socket_options(InetValues)}, self(), CbInfo],
> >         case ssl_connection_sup:start_child(ConnArgs) of
> >         {ok, Pid} ->
> >             ssl_connection:socket_control(Socket, Pid, CbModule);
> >         {error, Reason} ->
> >             {error, Reason}
> >         end;
> >     {error, Reason} ->
> >         {error, Reason}
> >     end;
> >
> > Regards,
> > Trevor
> >
> >
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://erlang.org/mailman/listinfo/erlang-questions
> >




More information about the erlang-questions mailing list