797ed93386
One year after Ilja van Sprundel, discovered and reported a large number of issues in the way the X server code base handles requests from X clients, they have been fixed.
409 lines
11 KiB
C
409 lines
11 KiB
C
/*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice including the dates of first publication and
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* either this permission notice or a reference to
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* http://oss.sgi.com/projects/FreeB/
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* shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR 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
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* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of Silicon Graphics, Inc.
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* shall not be used in advertising or otherwise to promote the sale, use or
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* other dealings in this Software without prior written authorization from
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* Silicon Graphics, Inc.
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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 <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "glxserver.h"
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#include "glxutil.h"
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#include "glxext.h"
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#include "indirect_dispatch.h"
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#include "unpack.h"
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int
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__glXDisp_FeedbackBuffer(__GLXclientState * cl, GLbyte * pc)
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{
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ClientPtr client = cl->client;
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GLsizei size;
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GLenum type;
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__GLXcontext *cx;
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int error;
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REQUEST_FIXED_SIZE(xGLXSingleReq, 8);
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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pc += __GLX_SINGLE_HDR_SIZE;
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size = *(GLsizei *) (pc + 0);
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type = *(GLenum *) (pc + 4);
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if (cx->feedbackBufSize < size) {
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cx->feedbackBuf = (GLfloat *) realloc(cx->feedbackBuf,
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(size_t) size
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* __GLX_SIZE_FLOAT32);
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if (!cx->feedbackBuf) {
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cl->client->errorValue = size;
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return BadAlloc;
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}
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cx->feedbackBufSize = size;
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}
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glFeedbackBuffer(size, type, cx->feedbackBuf);
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cx->hasUnflushedCommands = GL_TRUE;
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return Success;
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}
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int
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__glXDisp_SelectBuffer(__GLXclientState * cl, GLbyte * pc)
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{
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ClientPtr client = cl->client;
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__GLXcontext *cx;
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GLsizei size;
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int error;
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REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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pc += __GLX_SINGLE_HDR_SIZE;
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size = *(GLsizei *) (pc + 0);
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if (cx->selectBufSize < size) {
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cx->selectBuf = (GLuint *) realloc(cx->selectBuf,
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(size_t) size * __GLX_SIZE_CARD32);
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if (!cx->selectBuf) {
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cl->client->errorValue = size;
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return BadAlloc;
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}
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cx->selectBufSize = size;
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}
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glSelectBuffer(size, cx->selectBuf);
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cx->hasUnflushedCommands = GL_TRUE;
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return Success;
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}
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int
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__glXDisp_RenderMode(__GLXclientState * cl, GLbyte * pc)
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{
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ClientPtr client = cl->client;
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xGLXRenderModeReply reply;
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__GLXcontext *cx;
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GLint nitems = 0, retBytes = 0, retval, newModeCheck;
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GLubyte *retBuffer = NULL;
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GLenum newMode;
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int error;
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REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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pc += __GLX_SINGLE_HDR_SIZE;
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newMode = *(GLenum *) pc;
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retval = glRenderMode(newMode);
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/* Check that render mode worked */
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glGetIntegerv(GL_RENDER_MODE, &newModeCheck);
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if (newModeCheck != newMode) {
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/* Render mode change failed. Bail */
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newMode = newModeCheck;
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goto noChangeAllowed;
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}
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/*
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** Render mode might have still failed if we get here. But in this
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** case we can't really tell, nor does it matter. If it did fail, it
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** will return 0, and thus we won't send any data across the wire.
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*/
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switch (cx->renderMode) {
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case GL_RENDER:
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cx->renderMode = newMode;
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break;
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case GL_FEEDBACK:
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if (retval < 0) {
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/* Overflow happened. Copy the entire buffer */
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nitems = cx->feedbackBufSize;
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}
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else {
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nitems = retval;
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}
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retBytes = nitems * __GLX_SIZE_FLOAT32;
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retBuffer = (GLubyte *) cx->feedbackBuf;
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cx->renderMode = newMode;
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break;
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case GL_SELECT:
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if (retval < 0) {
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/* Overflow happened. Copy the entire buffer */
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nitems = cx->selectBufSize;
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}
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else {
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GLuint *bp = cx->selectBuf;
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GLint i;
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/*
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** Figure out how many bytes of data need to be sent. Parse
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** the selection buffer to determine this fact as the
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** return value is the number of hits, not the number of
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** items in the buffer.
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*/
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nitems = 0;
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i = retval;
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while (--i >= 0) {
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GLuint n;
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/* Parse select data for this hit */
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n = *bp;
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bp += 3 + n;
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}
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nitems = bp - cx->selectBuf;
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}
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retBytes = nitems * __GLX_SIZE_CARD32;
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retBuffer = (GLubyte *) cx->selectBuf;
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cx->renderMode = newMode;
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break;
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}
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/*
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** First reply is the number of elements returned in the feedback or
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** selection array, as per the API for glRenderMode itself.
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*/
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noChangeAllowed:;
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reply = (xGLXRenderModeReply) {
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.type = X_Reply,
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.sequenceNumber = client->sequence,
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.length = nitems,
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.retval = retval,
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.size = nitems,
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.newMode = newMode
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};
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WriteToClient(client, sz_xGLXRenderModeReply, &reply);
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if (retBytes) {
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WriteToClient(client, retBytes, retBuffer);
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}
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return Success;
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}
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int
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__glXDisp_Flush(__GLXclientState * cl, GLbyte * pc)
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{
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ClientPtr client = cl->client;
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__GLXcontext *cx;
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int error;
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REQUEST_SIZE_MATCH(xGLXSingleReq);
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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glFlush();
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cx->hasUnflushedCommands = GL_FALSE;
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return Success;
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}
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int
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__glXDisp_Finish(__GLXclientState * cl, GLbyte * pc)
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{
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ClientPtr client = cl->client;
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__GLXcontext *cx;
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int error;
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REQUEST_SIZE_MATCH(xGLXSingleReq);
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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/* Do a local glFinish */
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glFinish();
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cx->hasUnflushedCommands = GL_FALSE;
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/* Send empty reply packet to indicate finish is finished */
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client = cl->client;
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__GLX_BEGIN_REPLY(0);
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__GLX_SEND_HEADER();
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return Success;
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}
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#define SEPARATOR " "
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char *
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__glXcombine_strings(const char *cext_string, const char *sext_string)
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{
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size_t clen, slen;
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char *combo_string, *token, *s1;
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const char *s2, *end;
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/* safeguard to prevent potentially fatal errors in the string functions */
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if (!cext_string)
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cext_string = "";
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if (!sext_string)
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sext_string = "";
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/*
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** String can't be longer than min(cstring, sstring)
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** pull tokens out of shortest string
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** include space in combo_string for final separator and null terminator
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*/
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clen = strlen(cext_string);
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slen = strlen(sext_string);
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if (clen > slen) {
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combo_string = (char *) malloc(slen + 2);
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s1 = (char *) malloc(slen + 2);
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if (s1)
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strcpy(s1, sext_string);
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s2 = cext_string;
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}
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else {
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combo_string = (char *) malloc(clen + 2);
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s1 = (char *) malloc(clen + 2);
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if (s1)
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strcpy(s1, cext_string);
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s2 = sext_string;
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}
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if (!combo_string || !s1) {
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free(combo_string);
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free(s1);
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return NULL;
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}
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combo_string[0] = '\0';
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/* Get first extension token */
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token = strtok(s1, SEPARATOR);
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while (token != NULL) {
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/*
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** if token in second string then save it
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** beware of extension names which are prefixes of other extension names
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*/
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const char *p = s2;
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end = p + strlen(p);
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while (p < end) {
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size_t n = strcspn(p, SEPARATOR);
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if ((strlen(token) == n) && (strncmp(token, p, n) == 0)) {
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combo_string = strcat(combo_string, token);
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combo_string = strcat(combo_string, SEPARATOR);
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}
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p += (n + 1);
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}
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/* Get next extension token */
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token = strtok(NULL, SEPARATOR);
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}
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free(s1);
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return combo_string;
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}
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int
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DoGetString(__GLXclientState * cl, GLbyte * pc, GLboolean need_swap)
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{
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ClientPtr client = cl->client;
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__GLXcontext *cx;
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GLenum name;
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const char *string;
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__GLX_DECLARE_SWAP_VARIABLES;
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int error;
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char *buf = NULL, *buf1 = NULL;
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GLint length = 0;
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REQUEST_FIXED_SIZE(xGLXSingleReq, 4);
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/* If the client has the opposite byte order, swap the contextTag and
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* the name.
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*/
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if (need_swap) {
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__GLX_SWAP_INT(pc + 4);
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__GLX_SWAP_INT(pc + __GLX_SINGLE_HDR_SIZE);
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}
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cx = __glXForceCurrent(cl, __GLX_GET_SINGLE_CONTEXT_TAG(pc), &error);
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if (!cx) {
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return error;
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}
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pc += __GLX_SINGLE_HDR_SIZE;
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name = *(GLenum *) (pc + 0);
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string = (const char *) glGetString(name);
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if (string == NULL)
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string = "";
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/*
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** Restrict extensions to those that are supported by both the
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** implementation and the connection. That is, return the
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** intersection of client, server, and core extension strings.
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*/
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if (name == GL_EXTENSIONS) {
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buf1 = __glXcombine_strings(string, cl->GLClientextensions);
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buf = __glXcombine_strings(buf1, cx->pGlxScreen->GLextensions);
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free(buf1);
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string = buf;
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}
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else if (name == GL_VERSION) {
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if (atof(string) > atof(GLServerVersion)) {
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if (asprintf(&buf, "%s (%s)", GLServerVersion, string) == -1) {
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string = GLServerVersion;
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}
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else {
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string = buf;
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}
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}
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}
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if (string) {
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length = strlen((const char *) string) + 1;
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}
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__GLX_BEGIN_REPLY(length);
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__GLX_PUT_SIZE(length);
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if (need_swap) {
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__GLX_SWAP_REPLY_SIZE();
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__GLX_SWAP_REPLY_HEADER();
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}
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__GLX_SEND_HEADER();
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WriteToClient(client, length, string);
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free(buf);
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return Success;
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}
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int
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__glXDisp_GetString(__GLXclientState * cl, GLbyte * pc)
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{
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return DoGetString(cl, pc, GL_FALSE);
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}
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