/* 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. */ /* * An example input filter - this converts input to upper case. Note that * because of the moment it gets inserted it does NOT convert request headers. */ #include "httpd.h" #include "http_config.h" #include "apr_buckets.h" #include "apr_general.h" #include "apr_lib.h" #include "util_filter.h" #include "http_request.h" #include <ctype.h> static const char s_szCaseFilterName[] = "CaseFilterIn"; module AP_MODULE_DECLARE_DATA case_filter_in_module; typedef struct { int bEnabled; } CaseFilterInConfig; typedef struct { apr_bucket_brigade *pbbTmp; } CaseFilterInContext; static void *CaseFilterInCreateServerConfig(apr_pool_t *p, server_rec *s) { CaseFilterInConfig *pConfig = apr_pcalloc(p, sizeof *pConfig); pConfig->bEnabled = 0; return pConfig; } static void CaseFilterInInsertFilter(request_rec *r) { CaseFilterInConfig *pConfig=ap_get_module_config(r->server->module_config, &case_filter_in_module); if(!pConfig->bEnabled) return; ap_add_input_filter(s_szCaseFilterName,NULL,r,r->connection); } static apr_status_t CaseFilterInFilter(ap_filter_t *f, apr_bucket_brigade *pbbOut, ap_input_mode_t eMode, apr_read_type_e eBlock, apr_off_t nBytes) { request_rec *r = f->r; conn_rec *c = r->connection; CaseFilterInContext *pCtx; apr_status_t ret; if (!(pCtx = f->ctx)) { f->ctx = pCtx = apr_palloc(r->pool, sizeof *pCtx); pCtx->pbbTmp = apr_brigade_create(r->pool, c->bucket_alloc); } if (APR_BRIGADE_EMPTY(pCtx->pbbTmp)) { ret = ap_get_brigade(f->next, pCtx->pbbTmp, eMode, eBlock, nBytes); if (eMode == AP_MODE_EATCRLF || ret != APR_SUCCESS) return ret; } while(!APR_BRIGADE_EMPTY(pCtx->pbbTmp)) { apr_bucket *pbktIn = APR_BRIGADE_FIRST(pCtx->pbbTmp); apr_bucket *pbktOut; const char *data; apr_size_t len; char *buf; apr_size_t n; /* It is tempting to do this... * APR_BUCKET_REMOVE(pB); * APR_BRIGADE_INSERT_TAIL(pbbOut,pB); * and change the case of the bucket data, but that would be wrong * for a file or socket buffer, for example... */ if(APR_BUCKET_IS_EOS(pbktIn)) { APR_BUCKET_REMOVE(pbktIn); APR_BRIGADE_INSERT_TAIL(pbbOut, pbktIn); break; } ret=apr_bucket_read(pbktIn, &data, &len, eBlock); if(ret != APR_SUCCESS) return ret; buf = malloc(len); for(n=0 ; n < len ; ++n) buf[n] = apr_toupper(data[n]); pbktOut = apr_bucket_heap_create(buf, len, 0, c->bucket_alloc); APR_BRIGADE_INSERT_TAIL(pbbOut, pbktOut); apr_bucket_delete(pbktIn); } return APR_SUCCESS; } static const char *CaseFilterInEnable(cmd_parms *cmd, void *dummy, int arg) { CaseFilterInConfig *pConfig = ap_get_module_config(cmd->server->module_config, &case_filter_in_module); pConfig->bEnabled=arg; return NULL; } static const command_rec CaseFilterInCmds[] = { AP_INIT_FLAG("CaseFilterIn", CaseFilterInEnable, NULL, RSRC_CONF, "Run an input case filter on this host"), { NULL } }; static void CaseFilterInRegisterHooks(apr_pool_t *p) { ap_hook_insert_filter(CaseFilterInInsertFilter, NULL, NULL, APR_HOOK_MIDDLE); ap_register_input_filter(s_szCaseFilterName, CaseFilterInFilter, NULL, AP_FTYPE_RESOURCE); } module AP_MODULE_DECLARE_DATA case_filter_in_module = { STANDARD20_MODULE_STUFF, NULL, NULL, CaseFilterInCreateServerConfig, NULL, CaseFilterInCmds, CaseFilterInRegisterHooks };
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