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xclip.c
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xclip.c
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/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Protocol services - Clipboard functions
Copyright 2003-2008 Erik Forsberg <[email protected]> for Cendio AB
Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 2003-2008
Copyright 2006-2011 Pierre Ossman <[email protected]> for Cendio AB
Copyright 2016 Alexander Zakharov <[email protected]>
Copyright 2017 Henrik Andersson <[email protected]> for Cendio AB
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include "rdesktop.h"
/*
To gain better understanding of this code, one could be assisted by the following documents:
- Inter-Client Communication Conventions Manual (ICCCM)
HTML: http://tronche.com/gui/x/icccm/
PDF: http://ftp.xfree86.org/pub/XFree86/4.5.0/doc/PDF/icccm.pdf
- MSDN: Clipboard Formats
http://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/dataexchange/clipboard/clipboardformats.asp
*/
#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#include <iconv.h>
#define USE_UNICODE_CLIPBOARD
#endif
#ifdef USE_UNICODE_CLIPBOARD
#define RDP_CF_TEXT CF_UNICODETEXT
#else
#define RDP_CF_TEXT CF_TEXT
#endif
#define MAX_TARGETS 8
extern Display *g_display;
extern Window g_wnd;
extern Time g_last_gesturetime;
extern RD_BOOL g_rdpclip;
/* Mode of operation.
- Auto: Look at both PRIMARY and CLIPBOARD and use the most recent.
- Non-auto: Look at just CLIPBOARD. */
static RD_BOOL auto_mode = True;
/* Atoms of the two X selections we're dealing with: CLIPBOARD (explicit-copy) and PRIMARY (selection-copy) */
static Atom clipboard_atom, primary_atom;
/* Atom of the TARGETS clipboard target */
static Atom targets_atom;
/* Atom of the TIMESTAMP clipboard target */
static Atom timestamp_atom;
/* Atom _RDESKTOP_CLIPBOARD_TARGET which is used as the 'property' argument in
XConvertSelection calls: This is the property of our window into which
XConvertSelection will store the received clipboard data. */
static Atom rdesktop_clipboard_target_atom;
/* Atoms _RDESKTOP_PRIMARY_TIMESTAMP_TARGET and _RDESKTOP_CLIPBOARD_TIMESTAMP_TARGET
are used to store the timestamps for when a window got ownership of the selections.
We use these to determine which is more recent and should be used. */
static Atom rdesktop_primary_timestamp_target_atom, rdesktop_clipboard_timestamp_target_atom;
/* Storage for timestamps since we get them in two separate notifications. */
static Time primary_timestamp, clipboard_timestamp;
/* Clipboard target for getting a list of native Windows clipboard formats. The
presence of this target indicates that the selection owner is another rdesktop. */
static Atom rdesktop_clipboard_formats_atom;
/* The clipboard target (X jargon for "clipboard format") for rdesktop-to-rdesktop
interchange of Windows native clipboard data. The requestor must supply the
desired native Windows clipboard format in the associated property. */
static Atom rdesktop_native_atom;
/* Local copy of the list of native Windows clipboard formats. */
static uint8 *formats_data = NULL;
static uint32 formats_data_length = 0;
/* We need to know when another rdesktop process gets or loses ownership of a
selection. Without XFixes we do this by touching a property on the root window
which will generate PropertyNotify notifications. */
static Atom rdesktop_selection_notify_atom;
/* State variables that indicate if we're currently probing the targets of the
selection owner. reprobe_selections indicate that the ownership changed in
the middle of the current probe so it should be restarted. */
static RD_BOOL probing_selections, reprobe_selections;
/* Atoms _RDESKTOP_PRIMARY_OWNER and _RDESKTOP_CLIPBOARD_OWNER. Used as properties
on the root window to indicate which selections that are owned by rdesktop. */
static Atom rdesktop_primary_owner_atom, rdesktop_clipboard_owner_atom;
static Atom format_string_atom, format_utf8_string_atom, format_unicode_atom;
/* Atom of the INCR clipboard type (see ICCCM on "INCR Properties") */
static Atom incr_atom;
/* Stores the last "selection request" (= another X client requesting clipboard data from us).
To satisfy such a request, we request the clipboard data from the RDP server.
When we receive the response from the RDP server (asynchronously), this variable gives us
the context to proceed. */
static XSelectionRequestEvent selection_request;
/* Denotes we have a pending selection request. */
static RD_BOOL has_selection_request;
/* Stores the clipboard format (CF_TEXT, CF_UNICODETEXT etc.) requested in the last
CLIPDR_DATA_REQUEST (= the RDP server requesting clipboard data from us).
When we receive this data from whatever X client offering it, this variable gives us
the context to proceed.
*/
static int rdp_clipboard_request_format;
/* Array of offered clipboard targets that will be sent to fellow X clients upon a TARGETS request. */
static Atom targets[MAX_TARGETS];
static int num_targets;
/* Denotes that an rdesktop (not this rdesktop) is owning the selection,
allowing us to interchange Windows native clipboard data directly. */
static RD_BOOL rdesktop_is_selection_owner = False;
/* Time when we acquired the selection. */
static Time acquire_time = 0;
/* Denotes that an INCR ("chunked") transfer is in progress. */
static int g_waiting_for_INCR = 0;
/* Denotes the target format of the ongoing INCR ("chunked") transfer. */
static Atom g_incr_target = 0;
/* Buffers an INCR transfer. */
static uint8 *g_clip_buffer = 0;
/* Denotes the size of g_clip_buffer. */
static uint32 g_clip_buflen = 0;
/* Translates CR-LF to LF.
Changes the string in-place.
Does not stop on embedded nulls.
The length is updated. */
static void
crlf2lf(uint8 * data, uint32 * length)
{
uint8 *dst, *src;
src = dst = data;
while (src < data + *length)
{
if (*src != '\x0d')
*dst++ = *src;
src++;
}
*length = dst - data;
}
#ifdef USE_UNICODE_CLIPBOARD
/* Translate LF to CR-LF. To do this, we must allocate more memory.
The returned string is null-terminated, as required by CF_UNICODETEXT.
The size is updated. */
static uint8 *
utf16_lf2crlf(uint8 * data, uint32 * size)
{
uint8 *result;
uint16 *inptr, *outptr;
RD_BOOL swap_endianness;
/* Worst case: Every char is LF */
result = xmalloc((*size * 2) + 2);
if (result == NULL)
return NULL;
inptr = (uint16 *) data;
outptr = (uint16 *) result;
/* Check for a reversed BOM */
swap_endianness = (*inptr == 0xfffe);
uint16 uvalue_previous = 0; /* Kept so we'll avoid translating CR-LF to CR-CR-LF */
while ((uint8 *) inptr < data + *size)
{
uint16 uvalue = *inptr;
if (swap_endianness)
uvalue = ((uvalue << 8) & 0xff00) + (uvalue >> 8);
if ((uvalue == 0x0a) && (uvalue_previous != 0x0d))
*outptr++ = swap_endianness ? 0x0d00 : 0x0d;
uvalue_previous = uvalue;
*outptr++ = *inptr++;
}
*outptr++ = 0; /* null termination */
*size = (uint8 *) outptr - result;
return result;
}
#else
/* Translate LF to CR-LF. To do this, we must allocate more memory.
The length is updated. */
static uint8 *
lf2crlf(uint8 * data, uint32 * length)
{
uint8 *result, *p, *o;
/* Worst case: Every char is LF */
result = xmalloc(*length * 2);
p = data;
o = result;
uint8 previous = '\0'; /* Kept to avoid translating CR-LF to CR-CR-LF */
while (p < data + *length)
{
if ((*p == '\x0a') && (previous != '\x0d'))
*o++ = '\x0d';
previous = *p;
*o++ = *p++;
}
*length = o - result;
/* Convenience */
*o++ = '\0';
return result;
}
#endif
static void
xclip_provide_selection(XSelectionRequestEvent * req, Atom type, unsigned int format, uint8 * data,
uint32 length)
{
XEvent xev;
char *target_name, *property_name;
target_name = XGetAtomName(g_display, req->target);
property_name = XGetAtomName(g_display, req->property);
logger(Clipboard, Debug,
"xclip_provide_selection(), requestor=0x%08x, target=%s, property=%s, length=%u",
(unsigned) req->requestor, target_name, property_name, (unsigned) length);
XFree(target_name);
XFree(property_name);
XChangeProperty(g_display, req->requestor, req->property,
type, format, PropModeReplace, data, length);
xev.xselection.type = SelectionNotify;
xev.xselection.serial = 0;
xev.xselection.send_event = True;
xev.xselection.requestor = req->requestor;
xev.xselection.selection = req->selection;
xev.xselection.target = req->target;
xev.xselection.property = req->property;
xev.xselection.time = req->time;
XSendEvent(g_display, req->requestor, False, NoEventMask, &xev);
}
/* Replies a clipboard requestor, telling that we're unable to satisfy his request for whatever reason.
This has the benefit of finalizing the clipboard negotiation and thus not leaving our requestor
lingering (and, potentially, stuck). */
static void
xclip_refuse_selection(XSelectionRequestEvent * req)
{
XEvent xev;
char *target_name, *property_name;
target_name = XGetAtomName(g_display, req->target);
property_name = XGetAtomName(g_display, req->property);
logger(Clipboard, Debug,
"xclip_refuse_selection(), requestor=0x%08x, target=%s, property=%s",
(unsigned) req->requestor, target_name, property_name);
XFree(target_name);
XFree(property_name);
xev.xselection.type = SelectionNotify;
xev.xselection.serial = 0;
xev.xselection.send_event = True;
xev.xselection.requestor = req->requestor;
xev.xselection.selection = req->selection;
xev.xselection.target = req->target;
xev.xselection.property = None;
xev.xselection.time = req->time;
XSendEvent(g_display, req->requestor, False, NoEventMask, &xev);
}
/* Wrapper for cliprdr_send_data which also cleans the request state. */
static void
helper_cliprdr_send_response(uint8 * data, uint32 length)
{
if (rdp_clipboard_request_format != 0)
{
cliprdr_send_data(data, length);
rdp_clipboard_request_format = 0;
if (!rdesktop_is_selection_owner)
cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
}
}
/* Last resort, when we have to provide clipboard data but for whatever
reason couldn't get any.
*/
static void
helper_cliprdr_send_empty_response()
{
helper_cliprdr_send_response(NULL, 0);
}
/* Replies with clipboard data to RDP, converting it from the target format
to the expected RDP format as necessary. Returns true if data was sent.
*/
static RD_BOOL
xclip_send_data_with_convert(uint8 * source, size_t source_size, Atom target)
{
char *target_name;
target_name = XGetAtomName(g_display, target);
logger(Clipboard, Debug, "xclip_send_data_with_convert(), target=%s, size=%u",
target_name, (unsigned) source_size);
XFree(target_name);
#ifdef USE_UNICODE_CLIPBOARD
if (target == format_string_atom ||
target == format_unicode_atom || target == format_utf8_string_atom)
{
size_t unicode_buffer_size;
char *unicode_buffer;
iconv_t cd;
size_t unicode_buffer_size_remaining;
char *unicode_buffer_remaining;
char *data_remaining;
size_t data_size_remaining;
uint32 translated_data_size;
uint8 *translated_data;
if (rdp_clipboard_request_format != RDP_CF_TEXT)
return False;
/* Make an attempt to convert any string we send to Unicode.
We don't know what the RDP server's ANSI Codepage is, or how to convert
to it, so using CF_TEXT is not safe (and is unnecessary, since all
WinNT versions are Unicode-minded).
*/
if (target == format_string_atom)
{
char *locale_charset = nl_langinfo(CODESET);
cd = iconv_open(WINDOWS_CODEPAGE, locale_charset);
if (cd == (iconv_t) - 1)
{
logger(Clipboard, Error,
"xclip_send_data_with_convert(), convert failed, locale charset %s not found",
locale_charset);
return False;
}
unicode_buffer_size = source_size * 4;
}
else if (target == format_unicode_atom)
{
cd = iconv_open(WINDOWS_CODEPAGE, "UCS-2");
if (cd == (iconv_t) - 1)
{
return False;
}
unicode_buffer_size = source_size;
}
else if (target == format_utf8_string_atom)
{
cd = iconv_open(WINDOWS_CODEPAGE, "UTF-8");
if (cd == (iconv_t) - 1)
{
return False;
}
/* UTF-8 is guaranteed to be less or equally compact
as UTF-16 for all Unicode chars >=2 bytes.
*/
unicode_buffer_size = source_size * 2;
}
else
{
return False;
}
unicode_buffer = xmalloc(unicode_buffer_size);
unicode_buffer_size_remaining = unicode_buffer_size;
unicode_buffer_remaining = unicode_buffer;
data_remaining = (char *) source;
data_size_remaining = source_size;
iconv(cd, (char **) &data_remaining, &data_size_remaining,
&unicode_buffer_remaining, &unicode_buffer_size_remaining);
iconv_close(cd);
/* translate linebreaks */
translated_data_size = unicode_buffer_size - unicode_buffer_size_remaining;
translated_data = utf16_lf2crlf((uint8 *) unicode_buffer, &translated_data_size);
if (translated_data != NULL)
{
logger(Clipboard, Debug,
"xclip_send_data_with_convert(), sending unicode string of %d bytes",
translated_data_size);
helper_cliprdr_send_response(translated_data, translated_data_size);
xfree(translated_data); /* Not the same thing as XFree! */
}
xfree(unicode_buffer);
return True;
}
#else
if (target == format_string_atom)
{
uint8 *translated_data;
uint32 length = source_size;
if (rdp_clipboard_request_format != RDP_CF_TEXT)
return False;
logger(Clipboard, Debug,
"xclip_send_data_with_convert(), translating linebreaks before sending data");
translated_data = lf2crlf(source, &length);
if (translated_data != NULL)
{
helper_cliprdr_send_response(translated_data, length + 1);
xfree(translated_data); /* Not the same thing as XFree! */
}
return True;
}
#endif
else if (target == rdesktop_native_atom)
{
helper_cliprdr_send_response(source, source_size + 1);
return True;
}
else
{
return False;
}
}
static void
xclip_clear_target_props()
{
XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_target_atom);
XDeleteProperty(g_display, g_wnd, rdesktop_primary_timestamp_target_atom);
XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_timestamp_target_atom);
}
static void
xclip_notify_change()
{
XChangeProperty(g_display, DefaultRootWindow(g_display),
rdesktop_selection_notify_atom, XA_INTEGER, 32, PropModeReplace, NULL, 0);
}
static void
xclip_probe_selections()
{
Window primary_owner, clipboard_owner;
if (probing_selections)
{
logger(Clipboard, Debug,
"xclip_probe_selection(), already probing selections, scheduling reprobe");
reprobe_selections = True;
return;
}
logger(Clipboard, Debug, "xclip_probe_selection(), probing selections");
probing_selections = True;
reprobe_selections = False;
xclip_clear_target_props();
if (auto_mode)
primary_owner = XGetSelectionOwner(g_display, primary_atom);
else
primary_owner = None;
clipboard_owner = XGetSelectionOwner(g_display, clipboard_atom);
/* If we own all relevant selections then don't do anything. */
if (((primary_owner == g_wnd) || !auto_mode) && (clipboard_owner == g_wnd))
goto end;
/* Both available */
if ((primary_owner != None) && (clipboard_owner != None))
{
primary_timestamp = 0;
clipboard_timestamp = 0;
XConvertSelection(g_display, primary_atom, timestamp_atom,
rdesktop_primary_timestamp_target_atom, g_wnd, CurrentTime);
XConvertSelection(g_display, clipboard_atom, timestamp_atom,
rdesktop_clipboard_timestamp_target_atom, g_wnd, CurrentTime);
return;
}
/* Just PRIMARY */
if (primary_owner != None)
{
XConvertSelection(g_display, primary_atom, targets_atom,
rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
return;
}
/* Just CLIPBOARD */
if (clipboard_owner != None)
{
XConvertSelection(g_display, clipboard_atom, targets_atom,
rdesktop_clipboard_target_atom, g_wnd, CurrentTime);
return;
}
logger(Clipboard, Debug, "xclip_probe_selection(), no owner of any selection");
/* FIXME:
Without XFIXES, we cannot reliably know the formats offered by an
upcoming selection owner, so we just lie about him offering
RDP_CF_TEXT. */
cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
end:
probing_selections = False;
}
/* This function is called for SelectionNotify events.
The SelectionNotify event is sent from the clipboard owner to the requestor
after his request was satisfied.
If this function is called, we're the requestor side. */
void
xclip_handle_SelectionNotify(XSelectionEvent * event)
{
unsigned long i, nitems, bytes_left;
XWindowAttributes wa;
Atom type;
Atom *supported_targets;
int res, format;
uint8 *data = NULL;
char *selection_name, *target_name, *property_name;
if (event->property == None)
goto fail;
selection_name = XGetAtomName(g_display, event->selection);
target_name = XGetAtomName(g_display, event->target);
property_name = XGetAtomName(g_display, event->property);
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), selection=%s, target=%s, property=%s",
selection_name, target_name, property_name);
XFree(selection_name);
XFree(target_name);
XFree(property_name);
if (event->target == timestamp_atom)
{
if (event->selection == primary_atom)
{
res = XGetWindowProperty(g_display, g_wnd,
rdesktop_primary_timestamp_target_atom, 0,
XMaxRequestSize(g_display), False, AnyPropertyType,
&type, &format, &nitems, &bytes_left, &data);
}
else
{
res = XGetWindowProperty(g_display, g_wnd,
rdesktop_clipboard_timestamp_target_atom, 0,
XMaxRequestSize(g_display), False, AnyPropertyType,
&type, &format, &nitems, &bytes_left, &data);
}
if ((res != Success) || (nitems != 1) || (format != 32))
{
logger(Clipboard, Error,
"xclip_handle_SelectionNotify(), XGetWindowProperty failed");
goto fail;
}
if (event->selection == primary_atom)
{
primary_timestamp = *(Time *) data;
if (primary_timestamp == 0)
primary_timestamp++;
XDeleteProperty(g_display, g_wnd, rdesktop_primary_timestamp_target_atom);
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), got PRIMARY timestamp: %u",
(unsigned) primary_timestamp);
}
else
{
clipboard_timestamp = *(Time *) data;
if (clipboard_timestamp == 0)
clipboard_timestamp++;
XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_timestamp_target_atom);
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), got CLIPBOARD timestamp: %u",
(unsigned) clipboard_timestamp);
}
XFree(data);
if (primary_timestamp && clipboard_timestamp)
{
if (primary_timestamp > clipboard_timestamp)
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), PRIMARY is most recent selection");
XConvertSelection(g_display, primary_atom, targets_atom,
rdesktop_clipboard_target_atom, g_wnd,
event->time);
}
else
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), CLIPBOARD is most recent selection");
XConvertSelection(g_display, clipboard_atom, targets_atom,
rdesktop_clipboard_target_atom, g_wnd,
event->time);
}
}
return;
}
if (probing_selections && reprobe_selections)
{
probing_selections = False;
xclip_probe_selections();
return;
}
res = XGetWindowProperty(g_display, g_wnd, rdesktop_clipboard_target_atom,
0, XMaxRequestSize(g_display), False, AnyPropertyType,
&type, &format, &nitems, &bytes_left, &data);
xclip_clear_target_props();
if (res != Success)
{
logger(Clipboard, Error,
"xclip_handle_SelectionNotify(), XGetWindowProperty() failed");
goto fail;
}
if (type == incr_atom)
{
logger(Clipboard, Debug, "xclip_handle_SelectionNotify(), received INCR");
XGetWindowAttributes(g_display, g_wnd, &wa);
if ((wa.your_event_mask | PropertyChangeMask) != wa.your_event_mask)
{
XSelectInput(g_display, g_wnd, (wa.your_event_mask | PropertyChangeMask));
}
XFree(data);
data = NULL;
g_incr_target = event->target;
g_waiting_for_INCR = 1;
goto end;
}
/* Negotiate target format */
if (event->target == targets_atom)
{
/* Determine the best of text targets that we have available:
Prefer UTF8_STRING > text/unicode (unspecified encoding) > STRING
(ignore TEXT and COMPOUND_TEXT because we don't have code to handle them)
*/
int text_target_satisfaction = 0;
Atom best_text_target = 0; /* measures how much we're satisfied with what we found */
if (type != None)
{
supported_targets = (Atom *) data;
for (i = 0; i < nitems; i++)
{
target_name = XGetAtomName(g_display, supported_targets[i]);
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), target %d: %s", i,
target_name);
XFree(target_name);
if (supported_targets[i] == format_string_atom)
{
if (text_target_satisfaction < 1)
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), other party supports STRING, choosing that as best_target");
best_text_target = supported_targets[i];
text_target_satisfaction = 1;
}
}
#ifdef USE_UNICODE_CLIPBOARD
else if (supported_targets[i] == format_unicode_atom)
{
if (text_target_satisfaction < 2)
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), other party supports text/unicode, choosing that as best_target");
best_text_target = supported_targets[i];
text_target_satisfaction = 2;
}
}
else if (supported_targets[i] == format_utf8_string_atom)
{
if (text_target_satisfaction < 3)
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), other party supports UTF8_STRING, choosing that as best_target");
best_text_target = supported_targets[i];
text_target_satisfaction = 3;
}
}
#endif
else if (supported_targets[i] == rdesktop_clipboard_formats_atom)
{
if (probing_selections && (text_target_satisfaction < 4))
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), other party supports native formats, choosing that as best_target");
best_text_target = supported_targets[i];
text_target_satisfaction = 4;
}
}
}
}
/* Kickstarting the next step in the process of satisfying RDP's
clipboard request -- specifically, requesting the actual clipboard data.
*/
if ((best_text_target != 0)
&& (!probing_selections
|| (best_text_target == rdesktop_clipboard_formats_atom)))
{
XConvertSelection(g_display, event->selection, best_text_target,
rdesktop_clipboard_target_atom, g_wnd, event->time);
goto end;
}
else
{
logger(Clipboard, Error,
"xclip_handle_SelectionNotify(), unable to find a textual target to satisfy RDP clipboard text request");
goto fail;
}
}
else
{
if (probing_selections)
{
Window primary_owner, clipboard_owner;
/* FIXME:
Without XFIXES, we must make sure that the other
rdesktop owns all relevant selections or we might try
to get a native format from non-rdesktop window later
on. */
clipboard_owner = XGetSelectionOwner(g_display, clipboard_atom);
if (auto_mode)
primary_owner = XGetSelectionOwner(g_display, primary_atom);
else
primary_owner = clipboard_owner;
if (primary_owner != clipboard_owner)
goto fail;
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), got fellow rdesktop formats");
probing_selections = False;
rdesktop_is_selection_owner = True;
cliprdr_send_native_format_announce(data, nitems);
}
else if ((!nitems) || (!xclip_send_data_with_convert(data, nitems, event->target)))
{
goto fail;
}
}
end:
if (data)
XFree(data);
return;
fail:
xclip_clear_target_props();
if (probing_selections)
{
logger(Clipboard, Debug,
"xclip_handle_SelectionNotify(), unable to find suitable target, using default text format");
probing_selections = False;
rdesktop_is_selection_owner = False;
/* FIXME:
Without XFIXES, we cannot reliably know the formats offered by an
upcoming selection owner, so we just lie about him offering
RDP_CF_TEXT. */
cliprdr_send_simple_native_format_announce(RDP_CF_TEXT);
}
else
{
helper_cliprdr_send_empty_response();
}
goto end;
}
/* This function is called for SelectionRequest events.
The SelectionRequest event is sent from the requestor to the clipboard owner
to request clipboard data.
*/
void
xclip_handle_SelectionRequest(XSelectionRequestEvent * event)
{
unsigned long nitems, bytes_left;
unsigned char *prop_return = NULL;
int format, res;
Atom type;
char *selection_name, *target_name, *property_name;
selection_name = XGetAtomName(g_display, event->selection);
target_name = XGetAtomName(g_display, event->target);
property_name = XGetAtomName(g_display, event->property);
logger(Clipboard, Debug,
"xclip_handle_SelectionRequest(), selection=%s, target=%s, property=%s",
selection_name, target_name, property_name);
XFree(selection_name);
XFree(target_name);
XFree(property_name);
if (event->target == targets_atom)
{
xclip_provide_selection(event, XA_ATOM, 32, (uint8 *) & targets, num_targets);
return;
}
else if (event->target == timestamp_atom)
{
xclip_provide_selection(event, XA_INTEGER, 32, (uint8 *) & acquire_time, 1);
return;
}
else if (event->target == rdesktop_clipboard_formats_atom)
{
xclip_provide_selection(event, XA_STRING, 8, formats_data, formats_data_length);
}
else
{
/* All the following targets require an async operation with the RDP server
and currently we don't do X clipboard request queueing so we can only
handle one such request at a time. */
if (has_selection_request)
{
logger(Clipboard, Warning,
"xclip_handle_SelectionRequest(), overlapping clipboard request, skipping.");
xclip_refuse_selection(event);
return;
}
if (event->target == rdesktop_native_atom)
{
/* Before the requestor makes a request for the _RDESKTOP_NATIVE target,
he should declare requestor[property] = CF_SOMETHING. */
res = XGetWindowProperty(g_display, event->requestor,
event->property, 0, 1, True,
XA_INTEGER, &type, &format, &nitems, &bytes_left,
&prop_return);
if (res != Success || (!prop_return))
{
logger(Clipboard, Error,
"xclip_handle_SelectionRequest(), requested native format without specify which");
xclip_refuse_selection(event);
return;
}
format = *(uint32 *) prop_return;
XFree(prop_return);
}
else if (event->target == format_string_atom || event->target == XA_STRING)
{
/* STRING and XA_STRING are defined to be ISO8859-1 */
format = CF_TEXT;
}
else if (event->target == format_utf8_string_atom)
{
#ifdef USE_UNICODE_CLIPBOARD
format = CF_UNICODETEXT;
#else
logger(Clipboard, Warning,
"xclip_handle_SelectionRequest(), target unavailable due to lack of unicode support");
xclip_refuse_selection(event);
return;
#endif
}
else if (event->target == format_unicode_atom)
{
/* Assuming text/unicode to be UTF-16 */
format = CF_UNICODETEXT;
}
else
{
target_name = XGetAtomName(g_display, event->target);
logger(Clipboard, Warning,
"xclip_handle_SelectionRequest(), unsupported target format, target='%s'",
target_name);
XFree(target_name);
xclip_refuse_selection(event);
return;
}
cliprdr_send_data_request(format);
selection_request = *event;
has_selection_request = True;
return; /* wait for data */
}
}
/* While this rdesktop holds ownership over the clipboard, it means the clipboard data
is offered by the RDP server (and when it is pasted inside RDP, there's no network
roundtrip).
This event (SelectionClear) symbolizes this rdesktop lost ownership of the clipboard
to some other X client. We should find out what clipboard formats this other
client offers and announce that to RDP. */
void
xclip_handle_SelectionClear(void)
{
logger(Clipboard, Debug, "xclip_handle_SelectionClear()");
xclip_notify_change();
xclip_probe_selections();
}
/* Called when any property changes in our window or the root window. */
void
xclip_handle_PropertyNotify(XPropertyEvent * event)
{
unsigned long nitems;
unsigned long offset = 0;
unsigned long bytes_left = 1;
int format;
XWindowAttributes wa;
uint8 *data;
Atom type;
if (event->state == PropertyNewValue && g_waiting_for_INCR)
{
logger(Clipboard, Debug, "xclip_handle_PropertyNotify(), g_waiting_for_INCR != 0");
while (bytes_left > 0)
{
/* Unlike the specification, we don't set the 'delete' argument to True
since we slurp the INCR's chunks in even-smaller chunks of 4096 bytes. */
if ((XGetWindowProperty
(g_display, g_wnd, rdesktop_clipboard_target_atom, offset, 4096L,
False, AnyPropertyType, &type, &format, &nitems, &bytes_left,
&data) != Success))
{
XFree(data);
return;
}
if (nitems == 0)
{
/* INCR transfer finished */
XGetWindowAttributes(g_display, g_wnd, &wa);
XSelectInput(g_display, g_wnd,
(wa.your_event_mask ^ PropertyChangeMask));
XFree(data);
g_waiting_for_INCR = 0;
if (g_clip_buflen > 0)
{
if (!xclip_send_data_with_convert
(g_clip_buffer, g_clip_buflen, g_incr_target))
{
helper_cliprdr_send_empty_response();
}
xfree(g_clip_buffer);
g_clip_buffer = NULL;
g_clip_buflen = 0;
}
}
else
{
/* Another chunk in the INCR transfer */
offset += (nitems / 4); /* offset at which to begin the next slurp */
g_clip_buffer = xrealloc(g_clip_buffer, g_clip_buflen + nitems);
memcpy(g_clip_buffer + g_clip_buflen, data, nitems);
g_clip_buflen += nitems;
XFree(data);
}
}
XDeleteProperty(g_display, g_wnd, rdesktop_clipboard_target_atom);
return;
}
if ((event->atom == rdesktop_selection_notify_atom) &&
(event->window == DefaultRootWindow(g_display)))
xclip_probe_selections();
}
/* Called when the RDP server announces new clipboard data formats.
In response, we:
- take ownership over the clipboard
- declare those formats in their Windows native form
to other rdesktop instances on this X server */
void
ui_clip_format_announce(uint8 * data, uint32 length)
{
acquire_time = g_last_gesturetime;
XSetSelectionOwner(g_display, primary_atom, g_wnd, acquire_time);
if (XGetSelectionOwner(g_display, primary_atom) != g_wnd)
logger(Clipboard, Warning, "failed to acquire ownership of PRIMARY clipboard");