fc25bceb51
GLX registers an extension before we know if there are any screens that can actually do it. It's inconvenient to shrink the extension list, so instead allow the extension to simply zero out its base opcode to indicate that it needed to panic and disable itself. Signed-off-by: Adam Jackson <ajax@redhat.com>
307 lines
8.7 KiB
C
307 lines
8.7 KiB
C
/***********************************************************
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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******************************************************************/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <X11/X.h>
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#include <X11/Xproto.h>
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#include "misc.h"
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#include "dixstruct.h"
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#include "extnsionst.h"
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#include "gcstruct.h"
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#include "scrnintstr.h"
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#include "dispatch.h"
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#include "privates.h"
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#include "registry.h"
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#include "xace.h"
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#define LAST_ERROR 255
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static ExtensionEntry **extensions = (ExtensionEntry **) NULL;
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int lastEvent = EXTENSION_EVENT_BASE;
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static int lastError = FirstExtensionError;
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static unsigned int NumExtensions = 0;
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ExtensionEntry *
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AddExtension(const char *name, int NumEvents, int NumErrors,
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int (*MainProc) (ClientPtr c1),
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int (*SwappedMainProc) (ClientPtr c2),
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void (*CloseDownProc) (ExtensionEntry * e),
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unsigned short (*MinorOpcodeProc) (ClientPtr c3))
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{
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int i;
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ExtensionEntry *ext, **newexts;
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if (!MainProc || !SwappedMainProc || !MinorOpcodeProc)
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return ((ExtensionEntry *) NULL);
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if ((lastEvent + NumEvents > MAXEVENTS) ||
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(unsigned) (lastError + NumErrors > LAST_ERROR)) {
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LogMessage(X_ERROR, "Not enabling extension %s: maximum number of "
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"events or errors exceeded.\n", name);
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return ((ExtensionEntry *) NULL);
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}
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ext = calloc(sizeof(ExtensionEntry), 1);
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if (!ext)
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return NULL;
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if (!dixAllocatePrivates(&ext->devPrivates, PRIVATE_EXTENSION)) {
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free(ext);
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return NULL;
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}
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ext->name = strdup(name);
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if (!ext->name) {
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dixFreePrivates(ext->devPrivates, PRIVATE_EXTENSION);
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free(ext);
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return ((ExtensionEntry *) NULL);
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}
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i = NumExtensions;
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newexts = reallocarray(extensions, i + 1, sizeof(ExtensionEntry *));
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if (!newexts) {
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free((void *) ext->name);
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dixFreePrivates(ext->devPrivates, PRIVATE_EXTENSION);
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free(ext);
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return ((ExtensionEntry *) NULL);
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}
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NumExtensions++;
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extensions = newexts;
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extensions[i] = ext;
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ext->index = i;
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ext->base = i + EXTENSION_BASE;
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ext->CloseDown = CloseDownProc;
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ext->MinorOpcode = MinorOpcodeProc;
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ProcVector[i + EXTENSION_BASE] = MainProc;
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SwappedProcVector[i + EXTENSION_BASE] = SwappedMainProc;
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if (NumEvents) {
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ext->eventBase = lastEvent;
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ext->eventLast = lastEvent + NumEvents;
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lastEvent += NumEvents;
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}
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else {
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ext->eventBase = 0;
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ext->eventLast = 0;
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}
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if (NumErrors) {
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ext->errorBase = lastError;
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ext->errorLast = lastError + NumErrors;
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lastError += NumErrors;
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}
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else {
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ext->errorBase = 0;
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ext->errorLast = 0;
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}
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#ifdef X_REGISTRY_REQUEST
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RegisterExtensionNames(ext);
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#endif
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return ext;
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}
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static int
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FindExtension(const char *extname, int len)
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{
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int i;
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for (i = 0; i < NumExtensions; i++) {
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if ((strlen(extensions[i]->name) == len) &&
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!strncmp(extname, extensions[i]->name, len))
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break;
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}
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return ((i == NumExtensions) ? -1 : i);
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}
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/*
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* CheckExtension returns the extensions[] entry for the requested
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* extension name. Maybe this could just return a Bool instead?
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*/
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ExtensionEntry *
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CheckExtension(const char *extname)
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{
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int n;
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n = FindExtension(extname, strlen(extname));
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if (n != -1)
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return extensions[n];
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else
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return NULL;
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}
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/*
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* Added as part of Xace.
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*/
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ExtensionEntry *
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GetExtensionEntry(int major)
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{
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if (major < EXTENSION_BASE)
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return NULL;
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major -= EXTENSION_BASE;
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if (major >= NumExtensions)
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return NULL;
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return extensions[major];
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}
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unsigned short
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StandardMinorOpcode(ClientPtr client)
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{
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return ((xReq *) client->requestBuffer)->data;
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}
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void
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CloseDownExtensions(void)
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{
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int i;
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for (i = NumExtensions - 1; i >= 0; i--) {
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if (extensions[i]->CloseDown)
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extensions[i]->CloseDown(extensions[i]);
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NumExtensions = i;
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free((void *) extensions[i]->name);
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dixFreePrivates(extensions[i]->devPrivates, PRIVATE_EXTENSION);
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free(extensions[i]);
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}
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free(extensions);
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extensions = (ExtensionEntry **) NULL;
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lastEvent = EXTENSION_EVENT_BASE;
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lastError = FirstExtensionError;
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}
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static Bool
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ExtensionAvailable(ClientPtr client, ExtensionEntry *ext)
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{
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if (XaceHook(XACE_EXT_ACCESS, client, ext) != Success)
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return FALSE;
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if (!ext->base)
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return FALSE;
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return TRUE;
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}
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int
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ProcQueryExtension(ClientPtr client)
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{
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xQueryExtensionReply reply;
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int i;
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REQUEST(xQueryExtensionReq);
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REQUEST_FIXED_SIZE(xQueryExtensionReq, stuff->nbytes);
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reply = (xQueryExtensionReply) {
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.type = X_Reply,
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.sequenceNumber = client->sequence,
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.length = 0,
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.major_opcode = 0
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};
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if (!NumExtensions)
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reply.present = xFalse;
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else {
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i = FindExtension((char *) &stuff[1], stuff->nbytes);
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if (i < 0 || !ExtensionAvailable(client, extensions[i]))
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reply.present = xFalse;
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else {
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reply.present = xTrue;
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reply.major_opcode = extensions[i]->base;
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reply.first_event = extensions[i]->eventBase;
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reply.first_error = extensions[i]->errorBase;
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}
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}
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WriteReplyToClient(client, sizeof(xQueryExtensionReply), &reply);
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return Success;
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}
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int
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ProcListExtensions(ClientPtr client)
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{
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xListExtensionsReply reply;
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char *bufptr, *buffer;
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int total_length = 0;
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REQUEST_SIZE_MATCH(xReq);
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reply = (xListExtensionsReply) {
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.type = X_Reply,
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.nExtensions = 0,
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.sequenceNumber = client->sequence,
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.length = 0
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};
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buffer = NULL;
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if (NumExtensions) {
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int i;
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for (i = 0; i < NumExtensions; i++) {
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/* call callbacks to find out whether to show extension */
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if (!ExtensionAvailable(client, extensions[i]))
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continue;
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total_length += strlen(extensions[i]->name) + 1;
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reply.nExtensions += 1;
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}
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reply.length = bytes_to_int32(total_length);
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buffer = bufptr = malloc(total_length);
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if (!buffer)
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return BadAlloc;
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for (i = 0; i < NumExtensions; i++) {
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int len;
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if (!ExtensionAvailable(client, extensions[i]))
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continue;
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*bufptr++ = len = strlen(extensions[i]->name);
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memmove(bufptr, extensions[i]->name, len);
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bufptr += len;
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}
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}
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WriteReplyToClient(client, sizeof(xListExtensionsReply), &reply);
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if (reply.length)
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WriteToClient(client, total_length, buffer);
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free(buffer);
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return Success;
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}
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