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Refactor the LogContext type.

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LogContext is now the owner of the logevent() function that back ends
and so forth are constantly calling. Previously, logevent was owned by
the Frontend, which would store the message into its list for the GUI
Event Log dialog (or print it to standard error, or whatever) and then
pass it _back_ to LogContext to write to the currently open log file.
Now it's the other way round: LogContext gets the message from the
back end first, writes it to its log file if it feels so inclined, and
communicates it back to the front end.

This means that lots of parts of the back end system no longer need to
have a pointer to a full-on Frontend; the only thing they needed it
for was logging, so now they just have a LogContext (which many of
them had to have anyway, e.g. for logging SSH packets or session
traffic).

LogContext itself also doesn't get a full Frontend pointer any more:
it now talks back to the front end via a little vtable of its own
called LogPolicy, which contains the method that passes Event Log
entries through, the old askappend() function that decides whether to
truncate a pre-existing log file, and an emergency function for
printing an especially prominent message if the log file can't be
created. One minor nice effect of this is that console and GUI apps
can implement that last function subtly differently, so that Unix
console apps can write it with a plain \n instead of the \r\n
(harmless but inelegant) that the old centralised implementation
generated.

One other consequence of this is that the LogContext has to be
provided to backend_init() so that it's available to backends from the
instant of creation, rather than being provided via a separate API
call a couple of function calls later, because backends have typically
started doing things that need logging (like making network
connections) before the call to backend_provide_logctx. Fortunately,
there's no case in the whole code base where we don't already have
logctx by the time we make a backend (so I don't actually remember why
I ever delayed providing one). So that shortens the backend API by one
function, which is always nice.

While I'm tidying up, I've also moved the printf-style logeventf() and
the handy logevent_and_free() into logging.c, instead of having copies
of them scattered around other places. This has also let me remove
some stub functions from a couple of outlying applications like
Pageant. Finally, I've removed the pointless "_tag" at the end of
LogContext's official struct name.
This commit is contained in:
Simon Tatham
2018-10-10 19:26:18 +01:00
parent 1b67ec2963
commit ad0c502cef
47 changed files with 363 additions and 440 deletions
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29
sshshare.c
View File

@ -703,18 +703,6 @@ static void share_remove_forwarding(struct ssh_sharing_connstate *cs,
sfree(fwd);
}
static void logeventf(Frontend *frontend, const char *fmt, ...)
{
va_list ap;
char *buf;
va_start(ap, fmt);
buf = dupvprintf(fmt, ap);
va_end(ap);
logevent(frontend, buf);
sfree(buf);
}
static void log_downstream(struct ssh_sharing_connstate *cs,
const char *logfmt, ...)
{
@ -724,7 +712,7 @@ static void log_downstream(struct ssh_sharing_connstate *cs,
va_start(ap, logfmt);
buf = dupvprintf(logfmt, ap);
va_end(ap);
logeventf(cs->parent->cl->frontend,
logeventf(cs->parent->cl->logctx,
"Connection sharing downstream #%u: %s", cs->id, buf);
sfree(buf);
}
@ -738,7 +726,7 @@ static void log_general(struct ssh_sharing_state *sharestate,
va_start(ap, logfmt);
buf = dupvprintf(logfmt, ap);
va_end(ap);
logeventf(sharestate->cl->frontend, "Connection sharing: %s", buf);
logeventf(sharestate->cl->logctx, "Connection sharing: %s", buf);
sfree(buf);
}
@ -2080,7 +2068,7 @@ void ssh_connshare_provide_connlayer(ssh_sharing_state *sharestate,
* upstream) we return NULL.
*/
Socket *ssh_connection_sharing_init(
const char *host, int port, Conf *conf, Frontend *frontend,
const char *host, int port, Conf *conf, LogContext *logctx,
Plug *sshplug, ssh_sharing_state **state)
{
int result, can_upstream, can_downstream;
@ -2133,16 +2121,16 @@ Socket *ssh_connection_sharing_init(
/* For this result, if 'logtext' is not NULL then it is an
* error message indicating a reason why connection sharing
* couldn't be set up _at all_ */
logeventf(frontend,
logeventf(logctx,
"Could not set up connection sharing: %s", logtext);
} else {
/* Failing that, ds_err and us_err indicate why we
* couldn't be a downstream and an upstream respectively */
if (ds_err)
logeventf(frontend, "Could not set up connection sharing"
logeventf(logctx, "Could not set up connection sharing"
" as downstream: %s", ds_err);
if (us_err)
logeventf(frontend, "Could not set up connection sharing"
logeventf(logctx, "Could not set up connection sharing"
" as upstream: %s", us_err);
}
@ -2160,8 +2148,7 @@ Socket *ssh_connection_sharing_init(
*/
/* 'logtext' is a local endpoint address */
logeventf(frontend,
"Using existing shared connection at %s", logtext);
logeventf(logctx, "Using existing shared connection at %s", logtext);
*state = NULL;
sfree(sharestate);
@ -2177,7 +2164,7 @@ Socket *ssh_connection_sharing_init(
*/
/* 'logtext' is a local endpoint address */
logeventf(frontend, "Sharing this connection at %s", logtext);
logeventf(logctx, "Sharing this connection at %s", logtext);
*state = sharestate;
sharestate->listensock = sock;