That's what I get for not testing on all platforms before I push.
Forgot that, since OS X GTK mimics X11 GTK closely enough to still use
the name "CLIPBOARD" for the unique system clipboard, I had left this
code base's internal name for it as CLIP_CLIPBOARD and not the
CLIP_SYSTEM I used on Windows.
The gtkapp.c menu now has a Copy as well as Paste option; those menu
items, as well as the corresponding ones on the context menu and Copy
All, now address sets of clipboards parametrised between OS X and
ordinary GTK in unix.h. Also I've tweaked the wording of the
context-menu items to not use the X-specific terminology "CLIPBOARD"
on OS X.
I had a segfault on OS X today at Pterm.app shutdown. I wasn't able to
reproduce it in a debugger, but the cause seemed to be that
clipboard_clear called term_deselect (this was from before the patch
series that renamed that function) when inst->term was already NULL.
This must be because a clipboard_data_instance outlived its associated
inst->term, and quite likely its associated inst as well. But we can't
free those structures when a gui_data is freed, because GTK callbacks
will still depend on them; so instead we must have each gui_data keep
a list of active cdis pointing at it, and then at destruction time,
walk along the list nulling out each one's pointer to part of itself.
I've done the general clipboard revamp, and also, since I added
Ctrl-Shift-{C,V} as a new pair of UI actions for copy and paste, I've
also fulfilled the requirement that there should be some method of
non-menu-based pasting that doesn't depend on a middle mouse button or
an Ins key.
I think the list of OS X missing features is now down to details of
the OS X GTK port _itself_, as opposed to structural issues in the
general code base.
On all platforms, you can now configure which clipboard the mouse
pastes from, which clipboard Ctrl-Ins and Shift-Ins access, and which
Ctrl-Shift-C and Ctrl-Shift-V access. In each case, the options are:
- nothing at all
- a clipboard which is implicitly written by the act of mouse
selection (the PRIMARY selection on X, CLIP_LOCAL everywhere else)
- the standard clipboard written by explicit copy/paste UI actions
(CLIPBOARD on X, the unique system clipboard elsewhere).
Also, you can control whether selecting text with the mouse _also_
writes to the explicitly accessed clipboard.
The wording of the various messages changes between platforms, but the
basic UI shape is the same everywhere.
This makes space in the Selection panel (at least on Windows; it
wasn't overfull on Unix) to add a new set of config options
controlling the mapping of UI actions to clipboards.
(A possible future advantage of having spare space in this new Words
panel is that there's room to add controls for context-sensitive
special-casing, e.g. I'd quite like ':' to be treated differently when
it appears as part of "http://".)
This stores the last text selected in _this_ terminal, regardless of
whether any other application has since taken back whatever system
clipboard we also copied it to. It's written unconditionally whenever
text is selected in terminal.c.
The main purpose of this will be that it's also the place that you can
go and find the data you need to write to a system clipboard in
response to an explicit Copy operation. But it can also act as a data
source for pastes in its own right, so you can use it to implement an
intra-window private extra clipboard if that's useful. (OS X Terminal
has one of those, so _someone_ at least seems to like the idea.)
All the data fields referring to the selection in 'struct gui_data'
have been pulled out into a separate structure of which there are now
multiple instances, and I've plumbed through what should be the right
pointers and integer ids to everywhere they should go. So now the GTK
front end defines CLIP_PRIMARY and CLIP_CLIPBOARD in place of the
temporary cop-out CLIP_SYSTEM from the previous commit, and copying
and pasting can be done via either one.
The defaults should be the same as before, except that now the non-Mac
versions of the GtkApplication front ends will access CLIP_PRIMARY in
response to most actions but the 'Paste' menu item will paste from
CLIP_CLIPBOARD. (That's mostly just as a demonstration that accessing
multiple clipboards even works.)
This lays some groundwork for making PuTTY's cut and paste handling
more flexible in the area of which clipboard(s) it reads and writes,
if more than one is available on the system.
I've introduced a system of list macros which define an enumeration of
integer clipboard ids, some defined centrally in putty.h (at present
just a CLIP_NULL which never has any text in it, because that seems
like the sort of thing that will come in useful for configuring a
given copy or paste UI action to be ignored) and some defined per
platform. All the front end functions that copy and paste take a
clipboard id, and the Terminal structure is now configured at startup
to tell it which clipboard id it should paste from on a mouse click,
and which it should copy from on a selection.
However, I haven't actually added _real_ support for multiple X11
clipboards, in that the Unix front end supports a single CLIP_SYSTEM
regardless of whether it's in OS X or GTK mode. So this is currently a
NFC refactoring which does nothing but prepare the way for real
changes to come.
It's actually a function specific to the Windows front end, and has
been all along - but I've only just noticed that no other front end
either uses it or defines it.
Previously, both the Unix and Windows front ends would respond to a
paste action by retrieving data from the system clipboard, converting
it appropriately, _storing_ it in a persistent dynamic data block
inside the front end, and then calling term_do_paste(term), which in
turn would call back to the front end via get_clip() to retrieve the
current contents of that stored data block.
But, as far as I can tell, this was a completely pointless mechanism,
because after a data block was written into this storage area, it
would be immediately used for exactly one paste, and then never
accessed again until the next paste action caused it to be freed and
replaced with a new chunk of pasted data.
So why on earth was it stored persistently at all, and why that
callback mechanism from frontend to terminal back to frontend to
retrieve it for the actual paste action? I have no idea. This change
removes the entire system and replaces it with the completely obvious
alternative: the character-set-converted version of paste data is
allocated in a _local_ variable in the frontend paste functions,
passed directly to term_do_paste which now takes (buffer,length)
parameters, and freed immediately afterwards. get_clip() is gone.
These include an unused variable left over from the command-line
refactoring; an explicit referencing of the module handle for
sspicli.dll which we really do deliberately load and then don't
(directly) use; a missing pointer-type cast in the Windows handle
socket code; and two 32/64 bit integer size mismatches in the types of
functions I was importing from system API DLLs.
The last of those are a bit worrying, and suggest to me that after
going to all that trouble to add type-checking of those runtime
imports in commit 49fb598b0, I might have only checked the resulting
compiler output in a 32-bit build and not a 64-bit one. Oops!
When testing the previous commit, I went to great lengths to check all
the tricky corner cases of the detailed command-line argument handling
in Plink and PuTTY, on Windows and Unix. And did I also double-check
that I had not completely broken the very simplest possible invocation
of pterm? I did not.
The call to cmdline_host_ok() in gtkmain.c was failing an assertion in
pterm, because that function only expects to have been called by a
program that has the TOOLTYPE_HOST_ARG flag set - if that flag isn't
set, the program is expected to come up with its own answer to the
question (because I wasn't sure what the right fallback answer would
be). And I forgot to conditionalise the call between PuTTY and pterm.
This is another piece of long-overdue refactoring similar to the
recent commit e3796cb77. But where that one dealt with normalisation
of stuff already stored _in_ a Conf by whatever means (including, in
particular, handling a user typing 'username@host.name' into the
Hostname box of the GUI session dialog box), this one deals with
handling argv entries and putting them into the Conf.
This isn't exactly a pure no-functional-change-at-all refactoring. On
the other hand, it isn't a full-on cleanup that completely
rationalises all the user-visible behaviour as well as the code
structure. It's somewhere in between: I've preserved all the behaviour
quirks that I could imagine a reason for having intended, but taken
the opportunity to _not_ faithfully replicate anything I thought was
clearly just a bug.
So, for example, the following inconsistency is carefully preserved:
the command 'plink -load session nextword' treats 'nextword' as a host
name if the loaded session hasn't provided a hostname already, and
otherwise treats 'nextword' as the remote command to execute on the
already-specified remote host, but the same combination of arguments
to GUI PuTTY will _always_ treat 'nextword' as a hostname, overriding
a hostname (if any) in the saved session. That makes some sense to me
because of the different shapes of the overall command lines.
On the other hand, there are two behaviour changes I know of as a
result of this commit: a third argument to GUI PuTTY (after a hostname
and port) now provokes an error message instead of being silently
ignored, and in Plink, if you combine a -P option (specifying a port
number) with the historical comma-separated protocol selection prefix
on the hostname argument (which I'd completely forgotten even existed
until this piece of work), then the -P will now override the selected
protocol's default port number, whereas previously the default port
would win. For example, 'plink -P 12345 telnet,hostname' will now
connect via Telnet to port 12345 instead of to port 23.
There may be scope for removing or rethinking some of the command-
line syntax quirks in the wake of this change. If we do decide to do
anything like that, then hopefully having it all in one place will
make it easier to remove or change things consistently across the
tools.
Now 'putty user@host' will do what you wanted on Unix the same way it
always has on Windows.
(Thanks to Geoff Winkless for pointing out this inconsistency. I've
redone his actual patch my way, but he should still be credited for
the inspiration!)
A more or less identical piece of code to sanitise the CONF_host
string prior to session launch existed in Windows PuTTY and both
Windows and Unix Plink. It's long past time it was centralised.
While I'm here, I've added a couple of extra comments in the
centralised version, including one that - unfortunately - tries _but
fails_ to explain why a string of the form "host.name:1234" doesn't
get the suffix moved into CONF_port the way "user@host" moves the
prefix into CONF_username. Commit c1c1bc471 is the one I'm referring
to in the comment, and unfortunately it has an unexplained one-liner
log message from before I got into the habit of being usefully
verbose.
I've just noticed that on OS X I get high-bit-set junk in the text
side of my hex/ASCII dumps. That's going to confuse all sorts of
things that will interpret them in the wrong character set (indeed, in
many cases there won't even be a _right_ character set). Coerce to
ordinary ASCII.
Stopping dialog boxes from being modal is now done; post_main() is
defunct; nothing left in gtkwin.c does an inappropriate whole-process
termination in response to a window-level error or closure condition.
(There is still modalfatalbox(), but that's not an _inappropriate_
process termination.)
This one's in frontend_keypress(), which is supposed to close the
window on the first keypress after the session inside it terminates
(that is, if your close-on-exit settings haven't made it close already
at that point).
It looks to me as if that behaviour doesn't currently _work_, and
hasn't worked for quite a while (certainly it was broken as of 0.70,
well before I started on this weekend's refactoring), because when the
session terminates we delete inst->ldisc and that's what would
otherwise be calling frontend_keypress. I should probably decide what
to do about that at some point. But for the moment, I'm satisfied to
simply not break this functionality any worse by making it not a
process-global exit :-)
For gtkapp-based tools that will have to stop being a program-fatal
error, so I've turned it into a function called window_setup_error
(which I could in principle reuse for other problems in the long and
tortuous progress of new_session_window), and kept the original
handling in gtkmain.c's implementation of that function while gtkapp.c
does something more sensible with a message box.
Not all gtkwin-based tools use it. Only the ones with one session per
process, which parse a command line describing that session and might
reasonably want to report errors in that command line by writing to
standard error and exiting the program.
In other words, precisely the ones that link in gtkmain.c and not
gtkapp.c. So gtkmain.c is a more sensible place to put that
error-reporting function.
They don't do normal command-line processing, so they don't need it. A
few stray references to machinery provided in there are now satisfied
instead by a new stub module nocmdline.c.
This was one of a handful of remaining places in gtkwin.c where exit()
is called incautiously. Of course, a failure to set up one SSH
connection should only be fatal to that connection, not the whole
process, so really we should be feeding into the connection_fatal
system.
If ssh_init encounters a synchronous error, it will call random_unref
before returning. But the Ssh structure it created will still exist,
and if the caller (sensibly) responds by freeing it, then that will
cause a second random_unref, leading to the RNG's refcount going below
zero and failing an assertion.
We never noticed this before because with only one PuTTY connection
per process it was easier to just exit(1) without bothering to clean
things up. Now, with all the multi-sessions-per-process fixes I'm
doing, this has shown up as a problem. But other front ends may
legitimately still just exit - I don't think I can sensibly enforce
_not_ doing so at this late stage - so I've had to arrange to set a
flag in the Ssh saying whether a random_unref is still pending or not.
This existed in order to avoid the various confusions that could
happen if a toplevel callback ran in the context of a subsidiary
instance of gtk_main(). Now there aren't any subsidiary gtk_main
instances any more, this mechanism is no longer needed, and I can
throw it out. It was horrible anyway.
I think these began to appear as a consequencce of replacing
fatalbox() calls with more sensible error reports: the more specific a
direction I send a report in, the greater the annoying possibility of
re-entrance when the resulting error handler starts closing stuff.
This change requires me to break up the general cleanups in
delete_inst() into two halves: one runs when the error message box is
created, and cleans up the network connection and all the stuff
associated with it, and the other runs when the error message is
dismissed and the window can actually close.
It's an incoherent concept! There should not be any such thing as an
error box that terminates the entire program but is not modal. If it's
bad enough to terminate the whole program, i.e. _all_ currently live
connections, then there's no point in permitting progress to continue
in windows other than the affected one, because all windows are
affected anyway.
So all previous uses of fatalbox() have become modalfatalbox(), except
those which looked to me as if they shouldn't have been fatal in the
first place, e.g. lingering pieces of error handling in winnet.c which
ought to have had the severity of 'give up on this particular Socket
and close it' rather than 'give up on the ENTIRE UNIVERSE'.
I've also moved it out into gtkwin.c, because it seemed easier to do
the 'find existing instance of this dialog and raise it' dance there
than to split it across source files pointlessly.
Apart from the specific benefit of non-modality, this also makes it a
lot simpler compared to the previous code! I'm not completely sure why
I wasn't using the standard gtkdlg.c message box system all along.
This fits into a new dialog-box slot (because it might have to come up
at the same time as a network prompt), and makes use of the existing
callback system in logging.c which buffers the logging data until the
user says what they want done with it.
Now it has several 'slots', each named for a particular class of
subsidiary dialog box that a session window can have at most one of,
and register_network_prompt_dialog has a more general name and takes
an enum-typed argument identifying a slot. This lets me avoid writing
a zillion annoyingly similar function pairs and corresponding snippets
of cleanup code in delete_inst.
If you close a session window with an associated SSH back end, the
back end may call back to notify_remote_exit() from ssh_free(), which
queues a new top-level callback citing the inst structure we were
about to delete.
We could fix this by introducing a special 'moribund' flag which
inhibits notify_remote_exit from queueing a callback, but far easier
is to move the delete_callbacks_for_context() call to _after_ all
subsidiary things have been cleaned up, so that any last-minute
callbacks they might schedule will be promptly unscheduled again
before they do any damage.
This follows exactly the same pattern as for verify_ssh_host_key, but
the results of the dialog box are simpler (a plain yes-no response),
so the two dialog types can share a callback.
I've switched it to using the new non-modal create_message_box, and
provided a callback function which handles the cleanup afterwards.
I had expected this to be a lot more work, because I'd imagined that
I'd have to contort the coroutines in ssh.c to give them the ability
to wait for an asynchronously delivered result from that user prompt.
But in fact that wasn't necessary, because just such a mechanism has
been sitting there unused since commit 8574822b9 in 2005, when I added
it as part of my _previous_ attempt to write an OS X front end! (The
abandoned one written in native ObjC + Cocoa.)
When I switch verify_ssh_host_key() and friends over to creating
non-modal message boxes and returning to the main loop, there will be
a risk that their parent window will need to close for some other
reason while the user hasn't answered the pending question yet. (E.g.
if the user presses the main session window's close button, which will
no longer be a prohibited UI action once the transient dialog is not
modal.)
At that point we need to get rid of the pending dialog box, both for
UI purposes (it would look silly and be confusing to leave it lying
around) and for memory management (if the user subsequently clicks OK
in such a dialog it would probably try to leave its result somewhere
stale).
So now there's a mechanism for gtkwin.c remembering what the current
'network prompt dialog' is, if any (in which category I intend to
include everything triggered from ssh.c's various reasons for asking
crypto-related questions), and cleaning it up when the struct gui_data
it belongs to goes away.
If a dialog box is destroyed by the program before the user has
pressed one of the result-delivering buttons - e.g. because the parent
window closes so the dialog is no longer relevant to anything anyway -
then dlgparam_destroy would never call the client code's provided
callback. That makes sense in terms of the callback wanting to _take
action_ based on the result of the dialog box, but it ignores the
possibility that the callback may simply need to free its own context
structure.
So now dlgparam_destroy always calls the client's callback, even if
the result it passes is negative (meaning 'the user never got round to
pressing any of the dialog-ending buttons'), and all the existing
client callbacks handle the negative-result case by doing nothing
except freeing any allocated memory they might have.
This does the bulk of the work previously done by message_box()
proper, but takes a pointer to a result-reporting callback function
identical to the one we pass to create_config_box().
The modal version of message_box() still exists and is a small wrapper
on this function, running its own subsidiary gtk_main() loop which the
result callback terminates. But now I can start switching over
individual uses of message_box() to the non-modal version, and when
that's done, remove the modal function completely.
Now, in place of a variadic argument list with four parameters per
button and a terminating NULL, it takes a pointer to a struct which in
turn contains an (array,length) pair of small per-button structures.
In the process I've renamed the function from messagebox() to
message_box(). Partly that was just because it gave me a convenient
way to search the source for calls I hadn't converted yet, but also
I've thought for a while that that missing underscore didn't really
match the rest of my naming.
NFCI. Partly this minor refactor has the virtue that we can reuse the
more common button layouts without having to type them in at multiple
places in the code (and, indeed, I've provided buttons_yn and
buttons_ok for easy reuse, and could easily provide other things like
yesnocancel any time I need them). But mostly it's because I'm about
to split up message_box into multiple functions, and this saves me the
hassle of deciding which ones to make variadic and which to pass an
actual va_list to - particularly since messagebox() used to go over
its variadic argument list twice, which always makes delegating it to
another function that much more annoying.
ssh1_rdpkt claimed to be handling SSH1_MSG_DEBUG and SSH1_MSG_IGNORE
packets, but in fact, the handling of those has long since been moved
into the dispatch table; those particular entries are set up in
ssh1_protocol_setup().
