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-rw-r--r--modules/proxy/mod_proxy_express.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/modules/proxy/mod_proxy_express.c b/modules/proxy/mod_proxy_express.c
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+++ b/modules/proxy/mod_proxy_express.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 "mod_proxy.h"
+#include "apr_dbm.h"
+
+module AP_MODULE_DECLARE_DATA proxy_express_module;
+
+#include "apr_version.h"
+#if !APR_VERSION_AT_LEAST(2,0,0)
+#include "apu_version.h"
+#endif
+
+static int proxy_available = 0;
+
+typedef struct {
+ const char *dbmfile;
+ const char *dbmtype;
+ int enabled;
+} express_server_conf;
+
+static const char *set_dbmfile(cmd_parms *cmd,
+ void *dconf,
+ const char *arg)
+{
+ express_server_conf *sconf;
+ sconf = ap_get_module_config(cmd->server->module_config, &proxy_express_module);
+
+ if ((sconf->dbmfile = ap_server_root_relative(cmd->pool, arg)) == NULL) {
+ return apr_pstrcat(cmd->pool, "ProxyExpressDBMFile: bad path to file: ",
+ arg, NULL);
+ }
+ return NULL;
+}
+
+static const char *set_dbmtype(cmd_parms *cmd,
+ void *dconf,
+ const char *arg)
+{
+ express_server_conf *sconf;
+ sconf = ap_get_module_config(cmd->server->module_config, &proxy_express_module);
+
+ sconf->dbmtype = arg;
+
+ return NULL;
+}
+
+static const char *set_enabled(cmd_parms *cmd,
+ void *dconf,
+ int flag)
+{
+ express_server_conf *sconf;
+ sconf = ap_get_module_config(cmd->server->module_config, &proxy_express_module);
+
+ sconf->enabled = flag;
+
+ return NULL;
+}
+
+static void *server_create(apr_pool_t *p, server_rec *s)
+{
+ express_server_conf *a;
+
+ a = (express_server_conf *)apr_pcalloc(p, sizeof(express_server_conf));
+
+ a->dbmfile = NULL;
+ a->dbmtype = "default";
+ a->enabled = 0;
+
+ return (void *)a;
+}
+
+static void *server_merge(apr_pool_t *p, void *basev, void *overridesv)
+{
+ express_server_conf *a, *base, *overrides;
+
+ a = (express_server_conf *)apr_pcalloc(p,
+ sizeof(express_server_conf));
+ base = (express_server_conf *)basev;
+ overrides = (express_server_conf *)overridesv;
+
+ a->dbmfile = (overrides->dbmfile) ? overrides->dbmfile : base->dbmfile;
+ a->dbmtype = (overrides->dbmtype) ? overrides->dbmtype : base->dbmtype;
+ a->enabled = (overrides->enabled) ? overrides->enabled : base->enabled;
+
+ return (void *)a;
+}
+
+static int post_config(apr_pool_t *p,
+ apr_pool_t *plog,
+ apr_pool_t *ptemp,
+ server_rec *s)
+{
+ proxy_available = (ap_find_linked_module("mod_proxy.c") != NULL);
+ return OK;
+}
+
+
+static int xlate_name(request_rec *r)
+{
+ int i;
+ const char *name;
+ char *backend = NULL;
+ apr_dbm_t *db;
+ apr_status_t rv;
+ apr_datum_t key, val;
+ struct proxy_alias *ralias;
+ proxy_dir_conf *dconf;
+ express_server_conf *sconf;
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+ const apr_dbm_driver_t *driver;
+ const apu_err_t *err;
+#endif
+
+ sconf = ap_get_module_config(r->server->module_config, &proxy_express_module);
+ dconf = ap_get_module_config(r->per_dir_config, &proxy_module);
+
+ if (!sconf->enabled) {
+ return DECLINED;
+ }
+
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01001) "proxy_express: Enabled");
+ if (!sconf->dbmfile || (r->filename && strncmp(r->filename, "proxy:", 6) == 0)) {
+ /* it should be go on as an internal proxy request */
+ return DECLINED;
+ }
+
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01002)
+ "proxy_express: Opening DBM file: %s (%s)",
+ sconf->dbmfile, sconf->dbmtype);
+
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+ rv = apr_dbm_get_driver(&driver, sconf->dbmtype, &err, r->pool);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+ APLOGNO(10275) "The dbm library '%s' could not be loaded: %s (%s: %d)",
+ sconf->dbmtype, err->msg, err->reason, err->rc);
+ return DECLINED;
+ }
+
+ rv = apr_dbm_open2(&db, driver, sconf->dbmfile, APR_DBM_READONLY,
+ APR_OS_DEFAULT, r->pool);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
+ APLOGNO(10276) "The '%s' file '%s' could not be loaded",
+ sconf->dbmtype, sconf->dbmfile);
+ return DECLINED;
+ }
+#else
+ rv = apr_dbm_open_ex(&db, sconf->dbmtype, sconf->dbmfile, APR_DBM_READONLY,
+ APR_OS_DEFAULT, r->pool);
+ if (rv != APR_SUCCESS) {
+ return DECLINED;
+ }
+#endif
+
+ name = ap_get_server_name(r);
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01003)
+ "proxy_express: looking for %s", name);
+ key.dptr = (char *)name;
+ key.dsize = strlen(key.dptr);
+
+ rv = apr_dbm_fetch(db, key, &val);
+ if (rv == APR_SUCCESS) {
+ backend = apr_pstrmemdup(r->pool, val.dptr, val.dsize);
+ }
+ apr_dbm_close(db);
+ if (rv != APR_SUCCESS || !backend) {
+ return DECLINED;
+ }
+
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01004)
+ "proxy_express: found %s -> %s", name, backend);
+ r->filename = apr_pstrcat(r->pool, "proxy:", backend, r->uri, NULL);
+ r->handler = "proxy-server";
+ r->proxyreq = PROXYREQ_REVERSE;
+
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01005)
+ "proxy_express: rewritten as: %s", r->filename);
+
+ ralias = (struct proxy_alias *)dconf->raliases->elts;
+ /*
+ * See if we have already added a ProxyPassReverse entry
+ * for this host... If so, don't do it again.
+ */
+ /*
+ * NOTE: dconf is process specific so this will only
+ * work as long as we maintain that this process
+ * or thread is handling the backend
+ */
+ for (i = 0; i < dconf->raliases->nelts; i++, ralias++) {
+ if (strcasecmp(backend, ralias->real) == 0) {
+ ralias = NULL;
+ break;
+ }
+ }
+
+ /* Didn't find one... add it */
+ if (!ralias) {
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(01006)
+ "proxy_express: adding PPR entry");
+ ralias = apr_array_push(dconf->raliases);
+ ralias->fake = "/";
+ ralias->real = apr_pstrdup(dconf->raliases->pool, backend);
+ ralias->flags = 0;
+ }
+ return OK;
+}
+
+static const command_rec command_table[] = {
+ AP_INIT_FLAG("ProxyExpressEnable", set_enabled, NULL, OR_FILEINFO,
+ "Enable the ProxyExpress functionality"),
+ AP_INIT_TAKE1("ProxyExpressDBMFile", set_dbmfile, NULL, OR_FILEINFO,
+ "Location of ProxyExpressDBMFile file"),
+ AP_INIT_TAKE1("ProxyExpressDBMType", set_dbmtype, NULL, OR_FILEINFO,
+ "Type of ProxyExpressDBMFile file"),
+ { NULL }
+};
+
+static void register_hooks(apr_pool_t *p)
+{
+ ap_hook_post_config(post_config, NULL, NULL, APR_HOOK_LAST);
+ ap_hook_translate_name(xlate_name, NULL, NULL, APR_HOOK_FIRST);
+}
+
+/* the main config structure */
+
+AP_DECLARE_MODULE(proxy_express) =
+{
+ STANDARD20_MODULE_STUFF,
+ NULL, /* create per-dir config structures */
+ NULL, /* merge per-dir config structures */
+ server_create, /* create per-server config structures */
+ server_merge, /* merge per-server config structures */
+ command_table, /* table of config file commands */
+ register_hooks /* register hooks */
+};
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