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429 lines
11 KiB
429 lines
11 KiB
/* -- selection.c -- */
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#include "x11vnc.h"
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#include "cleanup.h"
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#include "connections.h"
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#include "unixpw.h"
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#include "xwrappers.h"
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/*
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* Selection/Cutbuffer/Clipboard handlers.
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*/
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int own_primary = 0; /* whether we currently own PRIMARY or not */
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int set_primary = 1;
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int own_clipboard = 0; /* whether we currently own CLIPBOARD or not */
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int set_clipboard = 1;
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int set_cutbuffer = 0; /* to avoid bouncing the CutText right back */
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int sel_waittime = 15; /* some seconds to skip before first send */
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Window selwin; /* special window for our selection */
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Atom clipboard_atom = None;
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/*
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* This is where we keep our selection: the string sent TO us from VNC
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* clients, and the string sent BY us to requesting X11 clients.
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*/
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char *xcut_str_primary = NULL;
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char *xcut_str_clipboard = NULL;
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void selection_request(XEvent *ev, char *type);
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int check_sel_direction(char *dir, char *label, char *sel, int len);
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void cutbuffer_send(void);
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void selection_send(XEvent *ev);
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/*
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* Our callbacks instruct us to check for changes in the cutbuffer
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* and PRIMARY and CLIPBOARD selection on the local X11 display.
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*
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* TODO: check if malloc does not cause performance issues (esp. WRT
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* SelectionNotify handling).
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*/
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static char cutbuffer_str[PROP_MAX+1];
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static char primary_str[PROP_MAX+1];
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static char clipboard_str[PROP_MAX+1];
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/*
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* An X11 (not VNC) client on the local display has requested the selection
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* from us (because we are the current owner).
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*
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* n.b.: our caller already has the X_LOCK.
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*/
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void selection_request(XEvent *ev, char *type) {
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#if NO_X11
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RAWFB_RET_VOID
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if (!ev || !type) {}
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return;
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#else
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XSelectionEvent notify_event;
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XSelectionRequestEvent *req_event;
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XErrorHandler old_handler;
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char *str;
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unsigned int length;
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unsigned char *data;
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static Atom xa_targets = None;
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# ifndef XA_LENGTH
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unsigned long XA_LENGTH;
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# endif
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RAWFB_RET_VOID
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# ifndef XA_LENGTH
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XA_LENGTH = XInternAtom(dpy, "LENGTH", True);
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# endif
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req_event = &(ev->xselectionrequest);
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notify_event.type = SelectionNotify;
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notify_event.display = req_event->display;
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notify_event.requestor = req_event->requestor;
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notify_event.selection = req_event->selection;
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notify_event.target = req_event->target;
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notify_event.time = req_event->time;
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if (req_event->property == None) {
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notify_event.property = req_event->target;
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} else {
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notify_event.property = req_event->property;
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}
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if (!strcmp(type, "PRIMARY")) {
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str = xcut_str_primary;
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} else if (!strcmp(type, "CLIPBOARD")) {
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str = xcut_str_clipboard;
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} else {
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return;
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}
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if (str) {
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length = strlen(str);
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} else {
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length = 0;
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}
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if (debug_sel) {
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rfbLog("%s\trequest event: owner=0x%x requestor=0x%x sel=%03d targ=%d prop=%d\n",
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type, req_event->owner, req_event->requestor, req_event->selection,
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req_event->target, req_event->property);
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}
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if (xa_targets == None) {
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xa_targets = XInternAtom(dpy, "TARGETS", False);
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}
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/* the window may have gone away, so trap errors */
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trapped_xerror = 0;
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old_handler = XSetErrorHandler(trap_xerror);
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if (ev->xselectionrequest.target == XA_LENGTH) {
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/* length request */
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int ret;
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long llength = (long) length;
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ret = XChangeProperty(ev->xselectionrequest.display,
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ev->xselectionrequest.requestor,
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ev->xselectionrequest.property,
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ev->xselectionrequest.target, 32, PropModeReplace,
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(unsigned char *) &llength, 1); /* had sizeof(unsigned int) = 4 before... */
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if (debug_sel) {
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rfbLog("LENGTH: XChangeProperty() -> %d\n", ret);
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}
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} else if (xa_targets != None && ev->xselectionrequest.target == xa_targets) {
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/* targets request */
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int ret;
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Atom targets[2];
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targets[0] = (Atom) xa_targets;
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targets[1] = (Atom) XA_STRING;
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data = (unsigned char *)str;
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ret = XChangeProperty(ev->xselectionrequest.display,
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ev->xselectionrequest.requestor,
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ev->xselectionrequest.property,
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ev->xselectionrequest.target, 32, PropModeReplace,
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(unsigned char *) targets, 2);
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if (debug_sel) {
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rfbLog("TARGETS: XChangeProperty() -> %d -- sz1: %d sz2: %d\n",
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ret, sizeof(targets[0]), sizeof(targets)/sizeof(targets[0]));
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}
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} else {
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/* data request */
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int ret;
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data = (unsigned char *)str;
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ret = XChangeProperty(ev->xselectionrequest.display,
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ev->xselectionrequest.requestor,
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ev->xselectionrequest.property,
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ev->xselectionrequest.target, 8, PropModeReplace,
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data, length);
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if (debug_sel) {
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rfbLog("DATA: XChangeProperty() -> %d\n", ret);
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}
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}
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if (! trapped_xerror) {
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int ret = XSendEvent(req_event->display, req_event->requestor, False, 0,
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(XEvent *)¬ify_event);
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if (debug_sel) {
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rfbLog("XSendEvent() -> %d\n", ret);
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}
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}
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if (trapped_xerror) {
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rfbLog("selection_request: ignored XError while sending "
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"%s selection to 0x%x.\n", type, req_event->requestor);
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}
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XSetErrorHandler(old_handler);
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trapped_xerror = 0;
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XFlush_wr(dpy);
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#endif /* NO_X11 */
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}
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int check_sel_direction(char *dir, char *label, char *sel, int len) {
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int db = 0, ok = 1;
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if (debug_sel) {
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db = 1;
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}
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if (sel_direction) {
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if (strstr(sel_direction, "debug")) {
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db = 1;
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}
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if (strcmp(sel_direction, "debug")) {
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if (strstr(sel_direction, dir) == NULL) {
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ok = 0;
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}
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}
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}
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if (db) {
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char str[40];
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int n = 40;
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strncpy(str, sel, n);
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str[n-1] = '\0';
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if (len < n) {
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str[len] = '\0';
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}
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rfbLog("%s: '%s'\n", label, str);
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if (ok) {
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rfbLog("%s: %s-ing it.\n", label, dir);
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} else {
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rfbLog("%s: NOT %s-ing it.\n", label, dir);
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}
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}
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return ok;
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}
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/*
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* CUT_BUFFER0 property on the local display has changed, we read and
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* store it and send it out to any connected VNC clients.
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*
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* n.b.: our caller already has the X_LOCK.
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*/
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void cutbuffer_send(void) {
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#if NO_X11
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RAWFB_RET_VOID
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return;
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#else
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Atom type;
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int format, slen, dlen, len;
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unsigned long nitems = 0, bytes_after = 0;
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unsigned char* data = NULL;
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cutbuffer_str[0] = '\0';
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slen = 0;
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RAWFB_RET_VOID
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/* read the property value into cutbuffer_str: */
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do {
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if (XGetWindowProperty(dpy, DefaultRootWindow(dpy),
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XA_CUT_BUFFER0, nitems/4, PROP_MAX/16, False,
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AnyPropertyType, &type, &format, &nitems, &bytes_after,
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&data) == Success) {
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dlen = nitems * (format/8);
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if (slen + dlen > PROP_MAX) {
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/* too big */
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rfbLog("warning: truncating large CUT_BUFFER0"
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" selection > %d bytes.\n", PROP_MAX);
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XFree_wr(data);
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break;
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}
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memcpy(cutbuffer_str+slen, data, dlen);
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slen += dlen;
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cutbuffer_str[slen] = '\0';
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XFree_wr(data);
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}
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} while (bytes_after > 0);
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cutbuffer_str[PROP_MAX] = '\0';
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if (debug_sel) {
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rfbLog("cutbuffer_send: '%s'\n", cutbuffer_str);
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}
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if (! all_clients_initialized()) {
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rfbLog("cutbuffer_send: no send: uninitialized clients\n");
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return; /* some clients initializing, cannot send */
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}
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if (unixpw_in_progress) {
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return;
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}
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/* now send it to any connected VNC clients (rfbServerCutText) */
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if (!screen) {
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return;
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}
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len = strlen(cutbuffer_str);
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if (check_sel_direction("send", "cutbuffer_send", cutbuffer_str, len)) {
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rfbSendServerCutText(screen, cutbuffer_str, len);
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}
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#endif /* NO_X11 */
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}
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/*
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* "callback" for our SelectionNotify polling. We try to determine if
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* the PRIMARY selection has changed (checking length and first CHKSZ bytes)
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* and if it has we store it and send it off to any connected VNC clients.
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*
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* n.b.: our caller already has the X_LOCK.
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*
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* TODO: if we were willing to use libXt, we could perhaps get selection
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* timestamps to speed up the checking... XtGetSelectionValue().
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*
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* Also: XFIXES has XFixesSelectSelectionInput().
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*/
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#define CHKSZ 32
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void selection_send(XEvent *ev) {
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#if NO_X11
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RAWFB_RET_VOID
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if (!ev) {}
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return;
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#else
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Atom type;
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int format, slen, dlen, oldlen, newlen, toobig = 0, len;
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static int err = 0, sent_one = 0;
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char before[CHKSZ], after[CHKSZ];
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unsigned long nitems = 0, bytes_after = 0;
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unsigned char* data = NULL;
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char *selection_str;
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RAWFB_RET_VOID
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/*
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* remember info about our last value of PRIMARY (or CUT_BUFFER0)
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* so we can check for any changes below.
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*/
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if (ev->xselection.selection == XA_PRIMARY) {
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if (! watch_primary) {
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return;
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}
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selection_str = primary_str;
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if (debug_sel) {
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rfbLog("selection_send: event PRIMARY prop: %d requestor: 0x%x atom: %d\n",
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ev->xselection.property, ev->xselection.requestor, ev->xselection.selection);
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}
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} else if (clipboard_atom && ev->xselection.selection == clipboard_atom) {
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if (! watch_clipboard) {
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return;
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}
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selection_str = clipboard_str;
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if (debug_sel) {
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rfbLog("selection_send: event CLIPBOARD prop: %d requestor: 0x%x atom: %d\n",
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ev->xselection.property, ev->xselection.requestor, ev->xselection.selection);
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}
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} else {
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return;
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}
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oldlen = strlen(selection_str);
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strncpy(before, selection_str, CHKSZ);
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selection_str[0] = '\0';
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slen = 0;
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/* read in the current value of PRIMARY or CLIPBOARD: */
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do {
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if (XGetWindowProperty(dpy, ev->xselection.requestor,
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ev->xselection.property, nitems/4, PROP_MAX/16, True,
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AnyPropertyType, &type, &format, &nitems, &bytes_after,
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&data) == Success) {
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dlen = nitems * (format/8);
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if (slen + dlen > PROP_MAX) {
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/* too big */
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toobig = 1;
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XFree_wr(data);
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if (err) { /* cut down on messages */
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break;
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} else {
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err = 5;
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}
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rfbLog("warning: truncating large PRIMARY"
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"/CLIPBOARD selection > %d bytes.\n",
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PROP_MAX);
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break;
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}
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if (debug_sel) fprintf(stderr, "selection_send: data: '%s' dlen: %d nitems: %lu ba: %lu\n", data, dlen, nitems, bytes_after);
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memcpy(selection_str+slen, data, dlen);
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slen += dlen;
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selection_str[slen] = '\0';
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XFree_wr(data);
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}
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} while (bytes_after > 0);
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if (! toobig) {
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err = 0;
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} else if (err) {
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err--;
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}
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if (! sent_one) {
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/* try to force a send first time in */
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oldlen = -1;
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sent_one = 1;
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}
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if (debug_sel) {
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rfbLog("selection_send: %s '%s'\n",
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ev->xselection.selection == XA_PRIMARY ? "PRIMARY " : "CLIPBOARD",
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selection_str);
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}
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/* look for changes in the new value */
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newlen = strlen(selection_str);
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strncpy(after, selection_str, CHKSZ);
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if (oldlen == newlen && strncmp(before, after, CHKSZ) == 0) {
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/* evidently no change */
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if (debug_sel) {
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rfbLog("selection_send: no change.\n");
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}
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return;
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}
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if (newlen == 0) {
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/* do not bother sending a null string out */
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return;
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}
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if (! all_clients_initialized()) {
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rfbLog("selection_send: no send: uninitialized clients\n");
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return; /* some clients initializing, cannot send */
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}
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if (unixpw_in_progress) {
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return;
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}
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/* now send it to any connected VNC clients (rfbServerCutText) */
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if (!screen) {
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return;
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}
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len = newlen;
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if (check_sel_direction("send", "selection_send", selection_str, len)) {
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rfbSendServerCutText(screen, selection_str, len);
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}
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#endif /* NO_X11 */
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}
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