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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
Download Patch File Download Diff File Expand all files Collapse all files

18
raw.c
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@ -15,7 +15,7 @@ struct Raw {
Socket *s;
int closed_on_socket_error;
int bufsize;
Frontend *frontend;
Seat *seat;
LogContext *logctx;
int sent_console_eof, sent_socket_eof, session_started;
@ -29,7 +29,7 @@ static void raw_size(Backend *be, int width, int height);
static void c_write(Raw *raw, const void *buf, int len)
{
int backlog = from_backend(raw->frontend, 0, buf, len);
int backlog = seat_stdout(raw->seat, buf, len);
sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG);
}
@ -37,7 +37,7 @@ static void raw_log(Plug *plug, int type, SockAddr *addr, int port,
const char *error_msg, int error_code)
{
Raw *raw = container_of(plug, Raw, plug);
backend_socket_log(raw->frontend, raw->logctx, type, addr, port,
backend_socket_log(raw->seat, raw->logctx, type, addr, port,
error_msg, error_code, raw->conf, raw->session_started);
}
@ -51,7 +51,7 @@ static void raw_check_close(Raw *raw)
if (raw->s) {
sk_close(raw->s);
raw->s = NULL;
notify_remote_exit(raw->frontend);
seat_notify_remote_exit(raw->seat);
}
}
}
@ -67,13 +67,13 @@ static void raw_closing(Plug *plug, const char *error_msg, int error_code,
sk_close(raw->s);
raw->s = NULL;
raw->closed_on_socket_error = TRUE;
notify_remote_exit(raw->frontend);
seat_notify_remote_exit(raw->seat);
}
logevent(raw->logctx, error_msg);
connection_fatal(raw->frontend, "%s", error_msg);
seat_connection_fatal(raw->seat, "%s", error_msg);
} else {
/* Otherwise, the remote side closed the connection normally. */
if (!raw->sent_console_eof && from_backend_eof(raw->frontend)) {
if (!raw->sent_console_eof && seat_eof(raw->seat)) {
/*
* The front end wants us to close the outgoing side of the
* connection as soon as we see EOF from the far end.
@ -119,7 +119,7 @@ static const PlugVtable Raw_plugvt = {
* Also places the canonical host name into `realhost'. It must be
* freed by the caller.
*/
static const char *raw_init(Frontend *frontend, Backend **backend_handle,
static const char *raw_init(Seat *seat, Backend **backend_handle,
LogContext *logctx, Conf *conf,
const char *host, int port, char **realhost,
int nodelay, int keepalive)
@ -141,7 +141,7 @@ static const char *raw_init(Frontend *frontend, Backend **backend_handle,
raw->session_started = FALSE;
raw->conf = conf_copy(conf);
raw->frontend = frontend;
raw->seat = seat;
raw->logctx = logctx;
addressfamily = conf_get_int(conf, CONF_addressfamily);