Access violation using gpgme

[Daniel Lo Nigro]

The code was using gpgme_io_write to write the passphrase followed by a
null byte:
https://github.com/wget/gpgme-sharp/blob/master/gpgme-sharp/Context.cs#L353-L354.
I changed it to gpgme_io_writen and newline. That code was written by
someone else way back in 2013 so I wonder if it's been broken this entire
time. Here's the changes I've made so far:
https://github.com/wget/gpgme-sharp/compare/master...Daniel15:pinentry

Now I'm getting closer, but there's still some odd behaviour. The first
time I run my test app, I get an access violation. However, it does spawn
gpg-agent correctly, and the second time I run it, it works fine! I guess
gpg-agent is properly receiving/caching the passphrase.

--
Regards,
Daniel Lo Nigro
https://d.sb/ | Twitter <http://twitter.com/Daniel15> | Facebook
<http://www.facebook.com/daaniel>


On Tue, Feb 5, 2019 at 10:32 AM Andre Heinecke <aheinecke at gnupg.org> wrote:

> Hi,
>
> On Tuesday, February 5, 2019 6:21:45 PM GMT Daniel Lo Nigro wrote:
> > I'm using gpgme_set_pinentry_mode to set the pinentry mode to "loopback",
> > and the access violation is being encountered after my pinentry callback
> > returns. It works fine if I don't use loopback, and instead use the
> > system's pinentry mechanism.
>
> This sounds like your passphrase callback returns invalid data. I would
> have
> to look how the PassphraseResult is mapped in the C# bindings but from the
> C
> API:
>
> The user must write the passphrase, followed by a newline character,
> to the file descriptor @var{fd}.  The function @code{gpgme_io_writen}
> should be used for the write operation.  Note that if the user returns
> 0 to indicate success, the user must at least write a newline
> character before returning from the callback.
>
>
> I do not think that you need to post your full code, but I would be
> interested
> in seeing your Passphrase callback.
> (Sorry If I'm  the only one answering here but in the GnuPG Team I'm the
> Guy
> for "all things windows" ;-) )
>
>
> Regards,
> Andre
>
> --
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