308 lines
8.7 KiB
C
308 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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#include <dix-config.h>
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#include <X11/X.h>
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#include <X11/Xproto.h>
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#include "dix/registry_priv.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 "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(1, sizeof(ExtensionEntry));
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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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extensions[i] = NULL;
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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 (XaceHookExtAccess(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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memcpy(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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