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New abstraction 'Seat', to pass to backends.

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This is a new vtable-based abstraction which is passed to a backend in
place of Frontend, and it implements only the subset of the Frontend
functions needed by a backend. (Many other Frontend functions still
exist, notably the wide range of things called by terminal.c providing
platform-independent operations on the GUI terminal window.)

The purpose of making it a vtable is that this opens up the
possibility of creating a backend as an internal implementation detail
of some other activity, by providing just that one backend with a
custom Seat that implements the methods differently.

For example, this refactoring should make it feasible to directly
implement an SSH proxy type, aka the 'jump host' feature supported by
OpenSSH, aka 'open a secondary SSH session in MAINCHAN_DIRECT_TCP
mode, and then expose the main channel of that as the Socket for the
primary connection'. (Which of course you can already do by spawning
'plink -nc' as a separate proxy process, but this would permit it in
the _same_ process without anything getting confused.)

I've centralised a full set of stub methods in misc.c for the new
abstraction, which allows me to get rid of several annoying stubs in
the previous code. Also, while I'm here, I've moved a lot of
duplicated modalfatalbox() type functions from application main
program files into wincons.c / uxcons.c, which I think saves
duplication overall. (A minor visible effect is that the prefixes on
those console-based fatal error messages will now be more consistent
between applications.)
This commit is contained in:
Simon Tatham
2018-10-11 19:58:42 +01:00
parent 109df9f46b
commit b4c8fd9d86
42 changed files with 1046 additions and 719 deletions
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16
windows/winstuff.h
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@ -237,11 +237,25 @@ void quit_help(HWND hwnd);
/*
* The terminal and logging context are notionally local to the
* Windows front end, but they must be shared between window.c and
* windlg.c. Likewise the saved-sessions list.
* windlg.c. Likewise the Seat structure for the Windows GUI.
*/
GLOBAL Terminal *term;
GLOBAL LogContext *logctx;
/*
* GUI seat methods in windlg.c.
*/
int win_seat_verify_ssh_host_key(
Seat *seat, const char *host, int port,
const char *keytype, char *keystr, char *key_fingerprint,
void (*callback)(void *ctx, int result), void *ctx);
int win_seat_confirm_weak_crypto_primitive(
Seat *seat, const char *algtype, const char *algname,
void (*callback)(void *ctx, int result), void *ctx);
int win_seat_confirm_weak_cached_hostkey(
Seat *seat, const char *algname, const char *betteralgs,
void (*callback)(void *ctx, int result), void *ctx);
/*
* Windows-specific clipboard helper function shared with windlg.c,
* which takes the data string in the system code page instead of