Michael Buckley bc4e619e76 Agent forwarding implementation (#752) ...

This PR contains a series of patches that date back many years and I
believe were discussed on the mailing list, but never merged. We have
been using these in our local copy of libssh2 without issue since 2015,
if not earlier. I believe this is the full set of changes, as we tried
to use comments to mark where our copy of libssh2 differs from the
canonical version.

This also contains changes I made earlier this year, but which were not
discussed on the mailing list, to support certificates and FIDO2 keys
with agent forwarding.

Note that this is not a complete implementation of agent forwarding, as
that is outside the scope of libssh2. Clients still need to provide
their own implementation that parses ssh-agent methods after calling
libssh2_channel_read() and calls the appropriate callback messages in
libssh2. See the man page changes in this PR for more details.

Integration-patches-by: Viktor Szakats

* prefer size_t
* prefer unsigned int over u_int in public function
* add const
* docs, indent, checksrc, debug call, compiler warning fixes

2023-04-22 10:54:20 +02:00

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