Hi Jente,
we use libssh2 for a client implementation too and we use both the
fingerprint (with libssh2_hostkey_hash) and the host key itself.
Function "libssh2_session_hostkey" returns pointer to the key as expected,
and also sets the key length and type.
In our code (that is not new anymore) we still use libssh2_session_startup
instead of libssh2_session_handshake but I don't think that should be a
problem.
Best regards,
JanO
On Wednesday 9. February 2022, 10:17:05 (+01:00), Jente Hidskes via
libssh2-devel wrote:
> Hey folks,
>
> I am working on a small SFTP client using libssh2. I would like for
> this client to persist the host key of the server it is connecting to,
> but I seem to be unable to get a hold of it.
>
> After initialising libssh2 and calling libssh2_session_handshake, I am
> able to print the host key fingerprint through libssh2_hostkey_hash as
> in the example programs. I assumed I would be able to print the actual
> host key rather than the fingerprint with libssh2_session_hostkey, but
> that returns an empty string.
>
> I suspect that libssh2_session_hostkey only returns the local host key
> when operating as a server (given this[1] source code comment), but
> the docs[2] are unclear about this: they just state "get the remote
> key" and "returns a pointer to the current host key".
>
> Am I doing something wrong, or is it indeed impossible right now to
> print the host key when operating as a client?
>
> Kind regards,
>
> Jente
>
> [1]
https://github.com/libssh2/libssh2/blob/2a2aaed3b6c3c1dc25e35e11afcfb23f88a18510/src/libssh2_priv.h#L628
[2] https://www.libssh2.org/libssh2_session_hostkey.html
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