Re: [PATCH] ws2_32: Add support to disable networking with envvar WINENONET=1

[Stefan Dösinger]

Am 2016-12-07 um 06:27 schrieb Bruno Jesus:
> @@ -2433,6 +2438,12 @@ static int WS2_send( int fd, struct ws2_async *wsa, int flags )
>      union generic_unix_sockaddr unix_addr;
>      int n, ret;
>
> +    if (network_disabled)
> +    {
> +        errno = EHOSTUNREACH;
> +        return -1;
> +    }
> +
> Shouldn't it be possible to achieve a similar effect with a LD_PRELOAD library?

[PATCH] ws2_32: Add support to disable networking with envvar WINENONET=1

[Bruno Jesus]

On Thu, Dec 8, 2016 at 4:41 PM, Stefan Dösinger
<stefandoesinger(a)gmail.com> wrote:
> Am 2016-12-07 um 06:27 schrieb Bruno Jesus:
> > @@ -2433,6 +2438,12 @@ static int WS2_send( int fd, struct ws2_async *wsa, int flags )
> >      union generic_unix_sockaddr unix_addr;
> >      int n, ret;
> >
> > +    if (network_disabled)
> > +    {
> > +        errno = EHOSTUNREACH;
> > +        return -1;
> > +    }
> > +
> > Shouldn't it be possible to achieve a similar effect with a LD_PRELOAD library?

Sorry, I don't get what you mean. What would I preload to make Wine
network fail?

[PATCH] ws2_32: Add support to disable networking with envvar WINENONET=1

[Stefan Dösinger]

Am 2016-12-08 um 19:30 schrieb Bruno Jesus:
> Sorry, I don't get what you mean. What would I preload to make Wine
> network fail?
> You can write a library that hooks the Linux side of the network related
> functions and returns an error, similarly to how you modified the
> implementations in Wine. I have used a similar hack to modify bind() to
> make multiple instances of Warcraft 3 work on my multiseat gaming box.
> Unfortunately I lost the source code to that library, but it was around
> 10 lines of code.

On OSX there's something called DYLD interposing if I remember
correctly, but I don't know how it works.