This is called by the backend to notify the Seat that the connection
has progressed to the point where the main session channel (i.e. the
thing that would typically correspond to the client's stdin/stdout)
has been successfully set up.
The only Seat that implements this method nontrivially is the one in
SshProxy, which uses it as an indication that the proxied connection
to the remote host has succeeded, and sends the
PLUGLOG_CONNECT_SUCCESS notification to its own Plug.
Hence, the only backends that need to implement it at the moment are
the two SSH-shaped backends (SSH proper and bare-connection / psusan).
For other backends, it's not always obvious what 'main session
channel' would even mean, or whether it means anything very useful; so
I've also introduced a backend flag indicating whether the backend is
expecting to call that method at all, so as not to have to spend
pointless effort on defining an arbitrary meaning for it in other
contexts.
So a lot of this patch is just introducing the new method and putting
its trivial do-nothing implementation into all the existing Seat
methods. The interesting parts happen in ssh/mainchan.c (which
actually calls it), and sshproxy.c (which does something useful in
response).
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.
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