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-rw-r--r--hooks/apr_hooks.c415
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diff --git a/hooks/apr_hooks.c b/hooks/apr_hooks.c
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "apr_pools.h"
+#include "apr_tables.h"
+#include "apr.h"
+#include "apr_hooks.h"
+#include "apr_hash.h"
+#include "apr_optional_hooks.h"
+#include "apr_optional.h"
+#define APR_WANT_MEMFUNC
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if 0
+#define apr_palloc(pool,size) malloc(size)
+#endif
+
+APU_DECLARE_DATA apr_pool_t *apr_hook_global_pool = NULL;
+APU_DECLARE_DATA int apr_hook_debug_enabled = 0;
+APU_DECLARE_DATA const char *apr_hook_debug_current = NULL;
+
+/** @deprecated @see apr_hook_global_pool */
+APU_DECLARE_DATA apr_pool_t *apr_global_hook_pool = NULL;
+
+/** @deprecated @see apr_hook_debug_enabled */
+APU_DECLARE_DATA int apr_debug_module_hooks = 0;
+
+/** @deprecated @see apr_hook_debug_current */
+APU_DECLARE_DATA const char *apr_current_hooking_module = NULL;
+
+/* NB: This must echo the LINK_##name structure */
+typedef struct
+{
+ void (*dummy)(void *);
+ const char *szName;
+ const char * const *aszPredecessors;
+ const char * const *aszSuccessors;
+ int nOrder;
+} TSortData;
+
+typedef struct tsort_
+{
+ void *pData;
+ int nPredecessors;
+ struct tsort_ **ppPredecessors;
+ struct tsort_ *pNext;
+} TSort;
+
+#ifdef NETWARE
+#include "apr_private.h"
+#define get_apd APP_DATA* apd = (APP_DATA*)get_app_data(gLibId);
+#define s_aHooksToSort ((apr_array_header_t *)(apd->gs_aHooksToSort))
+#define s_phOptionalHooks ((apr_hash_t *)(apd->gs_phOptionalHooks))
+#define s_phOptionalFunctions ((apr_hash_t *)(apd->gs_phOptionalFunctions))
+#endif
+
+static int crude_order(const void *a_,const void *b_)
+{
+ const TSortData *a=a_;
+ const TSortData *b=b_;
+
+ return a->nOrder-b->nOrder;
+}
+
+static TSort *prepare(apr_pool_t *p,TSortData *pItems,int nItems)
+{
+ TSort *pData=apr_palloc(p,nItems*sizeof *pData);
+ int n;
+
+ qsort(pItems,nItems,sizeof *pItems,crude_order);
+ for(n=0 ; n < nItems ; ++n) {
+ pData[n].nPredecessors=0;
+ pData[n].ppPredecessors=apr_pcalloc(p,nItems*sizeof *pData[n].ppPredecessors);
+ pData[n].pNext=NULL;
+ pData[n].pData=&pItems[n];
+ }
+
+ for(n=0 ; n < nItems ; ++n) {
+ int i,k;
+
+ for(i=0 ; pItems[n].aszPredecessors && pItems[n].aszPredecessors[i] ; ++i)
+ for(k=0 ; k < nItems ; ++k)
+ if(!strcmp(pItems[k].szName,pItems[n].aszPredecessors[i])) {
+ int l;
+
+ for(l=0 ; l < pData[n].nPredecessors ; ++l)
+ if(pData[n].ppPredecessors[l] == &pData[k])
+ goto got_it;
+ pData[n].ppPredecessors[pData[n].nPredecessors]=&pData[k];
+ ++pData[n].nPredecessors;
+ got_it:
+ break;
+ }
+ for(i=0 ; pItems[n].aszSuccessors && pItems[n].aszSuccessors[i] ; ++i)
+ for(k=0 ; k < nItems ; ++k)
+ if(!strcmp(pItems[k].szName,pItems[n].aszSuccessors[i])) {
+ int l;
+
+ for(l=0 ; l < pData[k].nPredecessors ; ++l)
+ if(pData[k].ppPredecessors[l] == &pData[n])
+ goto got_it2;
+ pData[k].ppPredecessors[pData[k].nPredecessors]=&pData[n];
+ ++pData[k].nPredecessors;
+ got_it2:
+ break;
+ }
+ }
+
+ return pData;
+}
+
+/* Topologically sort, dragging out-of-order items to the front. Note that
+ this tends to preserve things that want to be near the front better, and
+ changing that behaviour might compromise some of Apache's behaviour (in
+ particular, mod_log_forensic might otherwise get pushed to the end, and
+ core.c's log open function used to end up at the end when pushing items
+ to the back was the methedology). Also note that the algorithm could
+ go back to its original simplicity by sorting from the back instead of
+ the front.
+*/
+static TSort *tsort(TSort *pData,int nItems)
+{
+ int nTotal;
+ TSort *pHead=NULL;
+ TSort *pTail=NULL;
+
+ for(nTotal=0 ; nTotal < nItems ; ++nTotal) {
+ int n,i,k;
+
+ for(n=0 ; ; ++n) {
+ if(n == nItems)
+ assert(0); /* we have a loop... */
+ if(!pData[n].pNext) {
+ if(pData[n].nPredecessors) {
+ for(k=0 ; ; ++k) {
+ assert(k < nItems);
+ if(pData[n].ppPredecessors[k])
+ break;
+ }
+ for(i=0 ; ; ++i) {
+ assert(i < nItems);
+ if(&pData[i] == pData[n].ppPredecessors[k]) {
+ n=i-1;
+ break;
+ }
+ }
+ } else
+ break;
+ }
+ }
+ if(pTail)
+ pTail->pNext=&pData[n];
+ else
+ pHead=&pData[n];
+ pTail=&pData[n];
+ pTail->pNext=pTail; /* fudge it so it looks linked */
+ for(i=0 ; i < nItems ; ++i)
+ for(k=0 ; k < nItems ; ++k)
+ if(pData[i].ppPredecessors[k] == &pData[n]) {
+ --pData[i].nPredecessors;
+ pData[i].ppPredecessors[k]=NULL;
+ break;
+ }
+ }
+ if(pTail)
+ pTail->pNext=NULL; /* unfudge the tail */
+ return pHead;
+}
+
+static apr_array_header_t *sort_hook(apr_array_header_t *pHooks,
+ const char *szName)
+{
+ apr_pool_t *p;
+ TSort *pSort;
+ apr_array_header_t *pNew;
+ int n;
+
+ apr_pool_create(&p, apr_hook_global_pool);
+ pSort=prepare(p,(TSortData *)pHooks->elts,pHooks->nelts);
+ pSort=tsort(pSort,pHooks->nelts);
+ pNew=apr_array_make(apr_hook_global_pool,pHooks->nelts,sizeof(TSortData));
+ if(apr_hook_debug_enabled)
+ printf("Sorting %s:",szName);
+ for(n=0 ; pSort ; pSort=pSort->pNext,++n) {
+ TSortData *pHook;
+ assert(n < pHooks->nelts);
+ pHook=apr_array_push(pNew);
+ memcpy(pHook,pSort->pData,sizeof *pHook);
+ if(apr_hook_debug_enabled)
+ printf(" %s",pHook->szName);
+ }
+ if(apr_hook_debug_enabled)
+ fputc('\n',stdout);
+
+ /* destroy the pool - the sorted hooks were already copied */
+ apr_pool_destroy(p);
+
+ return pNew;
+}
+
+#ifndef NETWARE
+static apr_array_header_t *s_aHooksToSort;
+#endif
+
+typedef struct
+{
+ const char *szHookName;
+ apr_array_header_t **paHooks;
+} HookSortEntry;
+
+APU_DECLARE(void) apr_hook_sort_register(const char *szHookName,
+ apr_array_header_t **paHooks)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ HookSortEntry *pEntry;
+
+ if(!s_aHooksToSort)
+ s_aHooksToSort=apr_array_make(apr_hook_global_pool,1,sizeof(HookSortEntry));
+ pEntry=apr_array_push(s_aHooksToSort);
+ pEntry->szHookName=szHookName;
+ pEntry->paHooks=paHooks;
+}
+
+APU_DECLARE(void) apr_hook_sort_all(void)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ int n;
+
+ if (!s_aHooksToSort) {
+ s_aHooksToSort = apr_array_make(apr_hook_global_pool, 1, sizeof(HookSortEntry));
+ }
+
+ for(n=0 ; n < s_aHooksToSort->nelts ; ++n) {
+ HookSortEntry *pEntry=&((HookSortEntry *)s_aHooksToSort->elts)[n];
+ *pEntry->paHooks=sort_hook(*pEntry->paHooks,pEntry->szHookName);
+ }
+}
+
+#ifndef NETWARE
+static apr_hash_t *s_phOptionalHooks;
+static apr_hash_t *s_phOptionalFunctions;
+#endif
+
+APU_DECLARE(void) apr_hook_deregister_all(void)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ int n;
+
+ if (!s_aHooksToSort) {
+ return;
+ }
+
+ for(n=0 ; n < s_aHooksToSort->nelts ; ++n) {
+ HookSortEntry *pEntry=&((HookSortEntry *)s_aHooksToSort->elts)[n];
+ *pEntry->paHooks=NULL;
+ }
+ s_aHooksToSort=NULL;
+ s_phOptionalHooks=NULL;
+ s_phOptionalFunctions=NULL;
+}
+
+APU_DECLARE(void) apr_hook_debug_show(const char *szName,
+ const char * const *aszPre,
+ const char * const *aszSucc)
+{
+ int nFirst;
+
+ printf(" Hooked %s",szName);
+ if(aszPre) {
+ fputs(" pre(",stdout);
+ nFirst=1;
+ while(*aszPre) {
+ if(!nFirst)
+ fputc(',',stdout);
+ nFirst=0;
+ fputs(*aszPre,stdout);
+ ++aszPre;
+ }
+ fputc(')',stdout);
+ }
+ if(aszSucc) {
+ fputs(" succ(",stdout);
+ nFirst=1;
+ while(*aszSucc) {
+ if(!nFirst)
+ fputc(',',stdout);
+ nFirst=0;
+ fputs(*aszSucc,stdout);
+ ++aszSucc;
+ }
+ fputc(')',stdout);
+ }
+ fputc('\n',stdout);
+}
+
+/* Optional hook support */
+
+APR_DECLARE_EXTERNAL_HOOK(apr,APU,void,_optional,(void))
+
+APU_DECLARE(apr_array_header_t *) apr_optional_hook_get(const char *szName)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ apr_array_header_t **ppArray;
+
+ if(!s_phOptionalHooks)
+ return NULL;
+ ppArray=apr_hash_get(s_phOptionalHooks,szName,strlen(szName));
+ if(!ppArray)
+ return NULL;
+ return *ppArray;
+}
+
+APU_DECLARE(void) apr_optional_hook_add(const char *szName,void (*pfn)(void),
+ const char * const *aszPre,
+ const char * const *aszSucc,int nOrder)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ apr_array_header_t *pArray=apr_optional_hook_get(szName);
+ apr_LINK__optional_t *pHook;
+
+ if(!pArray) {
+ apr_array_header_t **ppArray;
+
+ pArray=apr_array_make(apr_hook_global_pool,1,
+ sizeof(apr_LINK__optional_t));
+ if(!s_phOptionalHooks)
+ s_phOptionalHooks=apr_hash_make(apr_hook_global_pool);
+ ppArray=apr_palloc(apr_hook_global_pool,sizeof *ppArray);
+ *ppArray=pArray;
+ apr_hash_set(s_phOptionalHooks,szName,strlen(szName),ppArray);
+ apr_hook_sort_register(szName,ppArray);
+ }
+ pHook=apr_array_push(pArray);
+ pHook->pFunc=pfn;
+ pHook->aszPredecessors=aszPre;
+ pHook->aszSuccessors=aszSucc;
+ pHook->nOrder=nOrder;
+ pHook->szName=apr_hook_debug_current;
+ if(apr_hook_debug_enabled)
+ apr_hook_debug_show(szName,aszPre,aszSucc);
+}
+
+/* optional function support */
+
+APU_DECLARE(apr_opt_fn_t *) apr_dynamic_fn_retrieve(const char *szName)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ if(!s_phOptionalFunctions)
+ return NULL;
+ return (void(*)(void))apr_hash_get(s_phOptionalFunctions,szName,strlen(szName));
+}
+
+/* Deprecated */
+APU_DECLARE_NONSTD(void) apr_dynamic_fn_register(const char *szName,
+ apr_opt_fn_t *pfn)
+{
+#ifdef NETWARE
+ get_apd
+#endif
+ if(!s_phOptionalFunctions)
+ s_phOptionalFunctions=apr_hash_make(apr_hook_global_pool);
+ apr_hash_set(s_phOptionalFunctions,szName,strlen(szName),(void *)pfn);
+}
+
+#if 0
+void main()
+{
+ const char *aszAPre[]={"b","c",NULL};
+ const char *aszBPost[]={"a",NULL};
+ const char *aszCPost[]={"b",NULL};
+ TSortData t1[]=
+ {
+ { "a",aszAPre,NULL },
+ { "b",NULL,aszBPost },
+ { "c",NULL,aszCPost }
+ };
+ TSort *pResult;
+
+ pResult=prepare(t1,3);
+ pResult=tsort(pResult,3);
+
+ for( ; pResult ; pResult=pResult->pNext)
+ printf("%s\n",pResult->pData->szName);
+}
+#endif