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The conditionalisation of that call on 'protocol == PROT_SSH' has been around since the beginning of our git history. But in those days, random_save_seed() was unconditional _internally_ - it would always create and write to the seed file regardless of whether the random pool had even been initialised, let alone used. Now random_save_seed() has its own internal condition which prevents it doing anything if the random subsystem was never started up in the first place. So it's better to call it unconditionally from cleanup_exit, and then it'll be able to do its thing whenever needed, without having to second-guess based on the top-level protocol. (In fact, that's what all the other implementations of cleanup_exit() have done all along. On Unix, and in Windows console apps, we do call random_save_seed() unconditionally, and expect it to uncomplainingly do nothing if there's nothing to do.)
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 .
Then, to install in the simplest way on Linux or Mac:
cmake --build . --target install
On Unix, pterm would like to be setuid or setgid, as appropriate, to
permit it to write records of user logins to /var/run/utmp and
/var/log/wtmp. (Of course it will not use this privilege for
anything else, and in particular it will drop all privileges before
starting up complex subsystems like GTK.) The cmake install step
doesn't attempt to add these privileges, so if you want user login
recording to work, you should manually ch{own,grp} and chmod the
pterm binary yourself after installation. If you don't do this,
pterm will still work, but not update the user login databases.
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.