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Diffstat (limited to 'dix/extension.c')
| -rw-r--r-- | dix/extension.c | 470 |
1 files changed, 470 insertions, 0 deletions
diff --git a/dix/extension.c b/dix/extension.c new file mode 100644 index 000000000..00c6b158d --- /dev/null +++ b/dix/extension.c @@ -0,0 +1,470 @@ +/*********************************************************** + +Copyright 1987, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + + +Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +/* $Xorg: extension.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */ + +#include "X.h" +#define NEED_REPLIES +#include "Xproto.h" +#include "misc.h" +#include "dixstruct.h" +#include "extnsionst.h" +#include "gcstruct.h" +#include "scrnintstr.h" +#ifdef XCSECURITY +#define _SECURITY_SERVER +#include "extensions/security.h" +#endif + +#define EXTENSION_BASE 128 +#define EXTENSION_EVENT_BASE 64 +#define LAST_EVENT 128 +#define LAST_ERROR 255 + +ScreenProcEntry AuxillaryScreenProcs[MAXSCREENS]; + +static ExtensionEntry **extensions = (ExtensionEntry **)NULL; + +int lastEvent = EXTENSION_EVENT_BASE; +static int lastError = FirstExtensionError; +static unsigned int NumExtensions = 0; + +ExtensionEntry *AddExtension(name, NumEvents, NumErrors, MainProc, + SwappedMainProc, CloseDownProc, MinorOpcodeProc) + char *name; + int NumEvents; + int NumErrors; + int (* MainProc)(); + int (* SwappedMainProc)(); + void (* CloseDownProc)(); + unsigned short (* MinorOpcodeProc)(); +{ + int i; + register ExtensionEntry *ext, **newexts; + + if (!MainProc || !SwappedMainProc || !CloseDownProc || !MinorOpcodeProc) + return((ExtensionEntry *) NULL); + if ((lastEvent + NumEvents > LAST_EVENT) || + (unsigned)(lastError + NumErrors > LAST_ERROR)) + return((ExtensionEntry *) NULL); + + ext = (ExtensionEntry *) xalloc(sizeof(ExtensionEntry)); + if (!ext) + return((ExtensionEntry *) NULL); + ext->name = (char *)xalloc(strlen(name) + 1); + ext->num_aliases = 0; + ext->aliases = (char **)NULL; + if (!ext->name) + { + xfree(ext); + return((ExtensionEntry *) NULL); + } + strcpy(ext->name, name); + i = NumExtensions; + newexts = (ExtensionEntry **) xrealloc(extensions, + (i + 1) * sizeof(ExtensionEntry *)); + if (!newexts) + { + xfree(ext->name); + xfree(ext); + return((ExtensionEntry *) NULL); + } + NumExtensions++; + extensions = newexts; + extensions[i] = ext; + ext->index = i; + ext->base = i + EXTENSION_BASE; + ext->CloseDown = CloseDownProc; + ext->MinorOpcode = MinorOpcodeProc; + ProcVector[i + EXTENSION_BASE] = MainProc; + SwappedProcVector[i + EXTENSION_BASE] = SwappedMainProc; + if (NumEvents) + { + ext->eventBase = lastEvent; + ext->eventLast = lastEvent + NumEvents; + lastEvent += NumEvents; + } + else + { + ext->eventBase = 0; + ext->eventLast = 0; + } + if (NumErrors) + { + ext->errorBase = lastError; + ext->errorLast = lastError + NumErrors; + lastError += NumErrors; + } + else + { + ext->errorBase = 0; + ext->errorLast = 0; + } +#ifdef XCSECURITY + ext->secure = FALSE; +#endif + +#ifdef LBX + (void) LbxAddExtension(name, ext->base, ext->eventBase, ext->errorBase); +#endif + return(ext); +} + +Bool AddExtensionAlias(alias, ext) + char *alias; + ExtensionEntry *ext; +{ + char *name; + char **aliases; + + aliases = (char **)xrealloc(ext->aliases, + (ext->num_aliases + 1) * sizeof(char *)); + if (!aliases) + return FALSE; + ext->aliases = aliases; + name = (char *)xalloc(strlen(alias) + 1); + if (!name) + return FALSE; + strcpy(name, alias); + ext->aliases[ext->num_aliases] = name; + ext->num_aliases++; +#ifdef LBX + return LbxAddExtensionAlias(ext->index, alias); +#else + return TRUE; +#endif +} + +static int +FindExtension(extname, len) + char *extname; + int len; +{ + int i, j; + + for (i=0; i<NumExtensions; i++) + { + if ((strlen(extensions[i]->name) == len) && + !strncmp(extname, extensions[i]->name, len)) + break; + for (j = extensions[i]->num_aliases; --j >= 0;) + { + if ((strlen(extensions[i]->aliases[j]) == len) && + !strncmp(extname, extensions[i]->aliases[j], len)) + break; + } + if (j >= 0) break; + } + return ((i == NumExtensions) ? -1 : i); +} + +void +DeclareExtensionSecurity(extname, secure) + char *extname; + Bool secure; +{ +#ifdef XCSECURITY + int i = FindExtension(extname, strlen(extname)); + if (i >= 0) + { + int majorop = extensions[i]->base; + extensions[i]->secure = secure; + if (secure) + { + UntrustedProcVector[majorop] = ProcVector[majorop]; + SwappedUntrustedProcVector[majorop] = SwappedProcVector[majorop]; + } + else + { + UntrustedProcVector[majorop] = ProcBadRequest; + SwappedUntrustedProcVector[majorop] = ProcBadRequest; + } + } +#endif +#ifdef LBX + LbxDeclareExtensionSecurity(extname, secure); +#endif +} + +unsigned short +StandardMinorOpcode(client) + ClientPtr client; +{ + return ((xReq *)client->requestBuffer)->data; +} + +unsigned short +MinorOpcodeOfRequest(client) + ClientPtr client; +{ + unsigned char major; + + major = ((xReq *)client->requestBuffer)->reqType; + if (major < EXTENSION_BASE) + return 0; + major -= EXTENSION_BASE; + if (major >= NumExtensions) + return 0; + return (*extensions[major]->MinorOpcode)(client); +} + +void +CloseDownExtensions() +{ + register int i,j; + +#ifdef LBX + LbxCloseDownExtensions(); +#endif + + for (i = NumExtensions - 1; i >= 0; i--) + { + (* extensions[i]->CloseDown)(extensions[i]); + NumExtensions = i; + xfree(extensions[i]->name); + for (j = extensions[i]->num_aliases; --j >= 0;) + xfree(extensions[i]->aliases[j]); + xfree(extensions[i]->aliases); + xfree(extensions[i]); + } + xfree(extensions); + extensions = (ExtensionEntry **)NULL; + lastEvent = EXTENSION_EVENT_BASE; + lastError = FirstExtensionError; + for (i=0; i<MAXSCREENS; i++) + { + register ScreenProcEntry *spentry = &AuxillaryScreenProcs[i]; + + while (spentry->num) + { + spentry->num--; + xfree(spentry->procList[spentry->num].name); + } + xfree(spentry->procList); + spentry->procList = (ProcEntryPtr)NULL; + } +} + + +int +ProcQueryExtension(client) + ClientPtr client; +{ + xQueryExtensionReply reply; + int i; + REQUEST(xQueryExtensionReq); + + REQUEST_FIXED_SIZE(xQueryExtensionReq, stuff->nbytes); + + reply.type = X_Reply; + reply.length = 0; + reply.major_opcode = 0; + reply.sequenceNumber = client->sequence; + + if ( ! NumExtensions ) + reply.present = xFalse; + else + { + i = FindExtension((char *)&stuff[1], stuff->nbytes); + if (i < 0 +#ifdef XCSECURITY + /* don't show insecure extensions to untrusted clients */ + || (client->trustLevel == XSecurityClientUntrusted && + !extensions[i]->secure) +#endif + ) + reply.present = xFalse; + else + { + reply.present = xTrue; + reply.major_opcode = extensions[i]->base; + reply.first_event = extensions[i]->eventBase; + reply.first_error = extensions[i]->errorBase; + } + } + WriteReplyToClient(client, sizeof(xQueryExtensionReply), &reply); + return(client->noClientException); +} + +int +ProcListExtensions(client) + ClientPtr client; +{ + xListExtensionsReply reply; + char *bufptr, *buffer; + int total_length = 0; + + REQUEST(xReq); + REQUEST_SIZE_MATCH(xReq); + + reply.type = X_Reply; + reply.nExtensions = 0; + reply.length = 0; + reply.sequenceNumber = client->sequence; + buffer = NULL; + + if ( NumExtensions ) + { + register int i, j; + + for (i=0; i<NumExtensions; i++) + { +#ifdef XCSECURITY + /* don't show insecure extensions to untrusted clients */ + if (client->trustLevel == XSecurityClientUntrusted && + !extensions[i]->secure) + continue; +#endif + total_length += strlen(extensions[i]->name) + 1; + reply.nExtensions += 1 + extensions[i]->num_aliases; + for (j = extensions[i]->num_aliases; --j >= 0;) + total_length += strlen(extensions[i]->aliases[j]) + 1; + } + reply.length = (total_length + 3) >> 2; + buffer = bufptr = (char *)ALLOCATE_LOCAL(total_length); + if (!buffer) + return(BadAlloc); + for (i=0; i<NumExtensions; i++) + { + int len; +#ifdef XCSECURITY + if (client->trustLevel == XSecurityClientUntrusted && + !extensions[i]->secure) + continue; +#endif + *bufptr++ = len = strlen(extensions[i]->name); + memmove(bufptr, extensions[i]->name, len); + bufptr += len; + for (j = extensions[i]->num_aliases; --j >= 0;) + { + *bufptr++ = len = strlen(extensions[i]->aliases[j]); + memmove(bufptr, extensions[i]->aliases[j], len); + bufptr += len; + } + } + } + WriteReplyToClient(client, sizeof(xListExtensionsReply), &reply); + if (reply.length) + { + WriteToClient(client, total_length, buffer); + DEALLOCATE_LOCAL(buffer); + } + return(client->noClientException); +} + + +ExtensionLookupProc +LookupProc(name, pGC) + char *name; + GCPtr pGC; +{ + register int i; + register ScreenProcEntry *spentry; + spentry = &AuxillaryScreenProcs[pGC->pScreen->myNum]; + if (spentry->num) + { + for (i = 0; i < spentry->num; i++) + if (strcmp(name, spentry->procList[i].name) == 0) + return(spentry->procList[i].proc); + } + return (ExtensionLookupProc)NULL; +} + +Bool +RegisterProc(name, pGC, proc) + char *name; + GC *pGC; + ExtensionLookupProc proc; +{ + return RegisterScreenProc(name, pGC->pScreen, proc); +} + +Bool +RegisterScreenProc(name, pScreen, proc) + char *name; + ScreenPtr pScreen; + ExtensionLookupProc proc; +{ + register ScreenProcEntry *spentry; + register ProcEntryPtr procEntry = (ProcEntryPtr)NULL; + char *newname; + int i; + + spentry = &AuxillaryScreenProcs[pScreen->myNum]; + /* first replace duplicates */ + if (spentry->num) + { + for (i = 0; i < spentry->num; i++) + if (strcmp(name, spentry->procList[i].name) == 0) + { + procEntry = &spentry->procList[i]; + break; + } + } + if (procEntry) + procEntry->proc = proc; + else + { + newname = (char *)xalloc(strlen(name)+1); + if (!newname) + return FALSE; + procEntry = (ProcEntryPtr) + xrealloc(spentry->procList, + sizeof(ProcEntryRec) * (spentry->num+1)); + if (!procEntry) + { + xfree(newname); + return FALSE; + } + spentry->procList = procEntry; + procEntry += spentry->num; + procEntry->name = newname; + strcpy(newname, name); + procEntry->proc = proc; + spentry->num++; + } + return TRUE; +} |