| /* 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. |
| */ |
| |
| /* |
| * mod_dir.c: handle default index files, and trailing-/ redirects |
| */ |
| |
| #include "apr_strings.h" |
| #include "apr_lib.h" |
| #include "ap_config.h" |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_request.h" |
| #include "http_protocol.h" |
| #include "http_log.h" |
| #include "http_main.h" |
| #include "util_script.h" |
| #include "mod_rewrite.h" |
| |
| module AP_MODULE_DECLARE_DATA dir_module; |
| |
| typedef enum { |
| MODDIR_OFF = 0, |
| MODDIR_ON, |
| MODDIR_UNSET |
| } moddir_cfg; |
| |
| #define REDIRECT_OFF 0 |
| #define REDIRECT_UNSET 1 |
| |
| typedef struct dir_config_struct { |
| apr_array_header_t *index_names; |
| moddir_cfg do_slash; |
| moddir_cfg checkhandler; |
| int redirect_index; |
| const char *dflt; |
| } dir_config_rec; |
| |
| #define DIR_CMD_PERMS OR_INDEXES |
| |
| static const char *add_index(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| dir_config_rec *d = dummy; |
| const char *t, *w; |
| int count = 0; |
| |
| if (!d->index_names) { |
| d->index_names = apr_array_make(cmd->pool, 2, sizeof(char *)); |
| } |
| |
| t = arg; |
| while ((w = ap_getword_conf(cmd->pool, &t)) && w[0]) { |
| if (count == 0 && !strcasecmp(w, "disabled")) { |
| /* peek to see if "disabled" is first in a series of arguments */ |
| const char *tt = t; |
| const char *ww = ap_getword_conf(cmd->temp_pool, &tt); |
| if (ww[0] == '\0') { |
| /* "disabled" is first, and alone */ |
| apr_array_clear(d->index_names); |
| break; |
| } |
| } |
| *(const char **)apr_array_push(d->index_names) = w; |
| count++; |
| } |
| |
| return NULL; |
| } |
| |
| static const char *configure_slash(cmd_parms *cmd, void *d_, int arg) |
| { |
| dir_config_rec *d = d_; |
| |
| d->do_slash = arg ? MODDIR_ON : MODDIR_OFF; |
| return NULL; |
| } |
| static const char *configure_checkhandler(cmd_parms *cmd, void *d_, int arg) |
| { |
| dir_config_rec *d = d_; |
| |
| d->checkhandler = arg ? MODDIR_ON : MODDIR_OFF; |
| return NULL; |
| } |
| static const char *configure_redirect(cmd_parms *cmd, void *d_, const char *arg1) |
| { |
| dir_config_rec *d = d_; |
| int status; |
| |
| if (!strcasecmp(arg1, "ON")) |
| status = HTTP_MOVED_TEMPORARILY; |
| else if (!strcasecmp(arg1, "OFF")) |
| status = REDIRECT_OFF; |
| else if (!strcasecmp(arg1, "permanent")) |
| status = HTTP_MOVED_PERMANENTLY; |
| else if (!strcasecmp(arg1, "temp")) |
| status = HTTP_MOVED_TEMPORARILY; |
| else if (!strcasecmp(arg1, "seeother")) |
| status = HTTP_SEE_OTHER; |
| else if (apr_isdigit(*arg1)) { |
| status = atoi(arg1); |
| if (!ap_is_HTTP_REDIRECT(status)) { |
| return "DirectoryIndexRedirect only accepts values between 300 and 399"; |
| } |
| } |
| else { |
| return "DirectoryIndexRedirect ON|OFF|permanent|temp|seeother|3xx"; |
| } |
| |
| d->redirect_index = status; |
| return NULL; |
| } |
| static const command_rec dir_cmds[] = |
| { |
| AP_INIT_TAKE1("FallbackResource", ap_set_string_slot, |
| (void*)APR_OFFSETOF(dir_config_rec, dflt), |
| DIR_CMD_PERMS, "Set a default handler"), |
| AP_INIT_RAW_ARGS("DirectoryIndex", add_index, NULL, DIR_CMD_PERMS, |
| "a list of file names"), |
| AP_INIT_FLAG("DirectorySlash", configure_slash, NULL, DIR_CMD_PERMS, |
| "On or Off"), |
| AP_INIT_FLAG("DirectoryCheckHandler", configure_checkhandler, NULL, DIR_CMD_PERMS, |
| "On or Off"), |
| AP_INIT_TAKE1("DirectoryIndexRedirect", configure_redirect, |
| NULL, DIR_CMD_PERMS, "On, Off, or a 3xx status code."), |
| |
| {NULL} |
| }; |
| |
| static void *create_dir_config(apr_pool_t *p, char *dummy) |
| { |
| dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec)); |
| |
| new->index_names = NULL; |
| new->do_slash = MODDIR_UNSET; |
| new->checkhandler = MODDIR_UNSET; |
| new->redirect_index = REDIRECT_UNSET; |
| return (void *) new; |
| } |
| |
| static void *merge_dir_configs(apr_pool_t *p, void *basev, void *addv) |
| { |
| dir_config_rec *new = apr_pcalloc(p, sizeof(dir_config_rec)); |
| dir_config_rec *base = (dir_config_rec *)basev; |
| dir_config_rec *add = (dir_config_rec *)addv; |
| |
| new->index_names = add->index_names ? add->index_names : base->index_names; |
| new->do_slash = |
| (add->do_slash == MODDIR_UNSET) ? base->do_slash : add->do_slash; |
| new->checkhandler = |
| (add->checkhandler == MODDIR_UNSET) ? base->checkhandler : add->checkhandler; |
| new->redirect_index= |
| (add->redirect_index == REDIRECT_UNSET) ? base->redirect_index : add->redirect_index; |
| new->dflt = add->dflt ? add->dflt : base->dflt; |
| return new; |
| } |
| |
| static int fixup_dflt(request_rec *r) |
| { |
| dir_config_rec *d = ap_get_module_config(r->per_dir_config, &dir_module); |
| const char *name_ptr; |
| request_rec *rr; |
| int error_notfound = 0; |
| |
| name_ptr = d->dflt; |
| if ((name_ptr == NULL) || !(strcasecmp(name_ptr,"disabled"))){ |
| return DECLINED; |
| } |
| /* XXX: if FallbackResource points to something that doesn't exist, |
| * this may recurse until it hits the limit for internal redirects |
| * before returning an Internal Server Error. |
| */ |
| |
| /* The logic of this function is basically cloned and simplified |
| * from fixup_dir below. See the comments there. |
| */ |
| if (r->args != NULL) { |
| name_ptr = apr_pstrcat(r->pool, name_ptr, "?", r->args, NULL); |
| } |
| rr = ap_sub_req_lookup_uri(name_ptr, r, r->output_filters); |
| if (rr->status == HTTP_OK |
| && ( (rr->handler && !strcmp(rr->handler, "proxy-server")) |
| || rr->finfo.filetype == APR_REG)) { |
| ap_internal_fast_redirect(rr, r); |
| return OK; |
| } |
| else if (ap_is_HTTP_REDIRECT(rr->status)) { |
| |
| apr_pool_join(r->pool, rr->pool); |
| r->notes = apr_table_overlay(r->pool, r->notes, rr->notes); |
| r->headers_out = apr_table_overlay(r->pool, r->headers_out, |
| rr->headers_out); |
| r->err_headers_out = apr_table_overlay(r->pool, r->err_headers_out, |
| rr->err_headers_out); |
| error_notfound = rr->status; |
| } |
| else if (rr->status && rr->status != HTTP_NOT_FOUND |
| && rr->status != HTTP_OK) { |
| error_notfound = rr->status; |
| } |
| |
| ap_destroy_sub_req(rr); |
| if (error_notfound) { |
| return error_notfound; |
| } |
| |
| /* nothing for us to do, pass on through */ |
| return DECLINED; |
| } |
| |
| static int fixup_dir(request_rec *r) |
| { |
| dir_config_rec *d; |
| char *dummy_ptr[1]; |
| char **names_ptr; |
| int num_names; |
| int error_notfound = 0; |
| |
| /* In case mod_mime wasn't present, and no handler was assigned. */ |
| if (!r->handler) { |
| r->handler = DIR_MAGIC_TYPE; |
| } |
| |
| /* Never tolerate path_info on dir requests */ |
| if (r->path_info && *r->path_info) { |
| return DECLINED; |
| } |
| |
| d = (dir_config_rec *)ap_get_module_config(r->per_dir_config, |
| &dir_module); |
| |
| /* Redirect requests that are not '/' terminated */ |
| if (r->uri[0] == '\0' || r->uri[strlen(r->uri) - 1] != '/') |
| { |
| char *ifile; |
| |
| if (!d->do_slash) { |
| return DECLINED; |
| } |
| |
| /* Only redirect non-get requests if we have no note to warn |
| * that this browser cannot handle redirs on non-GET requests |
| * (such as Microsoft's WebFolders). |
| */ |
| if ((r->method_number != M_GET) |
| && apr_table_get(r->subprocess_env, "redirect-carefully")) { |
| return DECLINED; |
| } |
| |
| if (r->args != NULL) { |
| ifile = apr_pstrcat(r->pool, ap_escape_uri(r->pool, r->uri), |
| "/?", r->args, NULL); |
| } |
| else { |
| ifile = apr_pstrcat(r->pool, ap_escape_uri(r->pool, r->uri), |
| "/", NULL); |
| } |
| |
| apr_table_setn(r->headers_out, "Location", |
| ap_construct_url(r->pool, ifile, r)); |
| return HTTP_MOVED_PERMANENTLY; |
| } |
| |
| if (r->method_number != M_GET && r->method_number != M_POST) { |
| return DECLINED; |
| } |
| |
| if (d->checkhandler == MODDIR_ON && strcmp(r->handler, DIR_MAGIC_TYPE)) { |
| /* Prevent DIR_MAGIC_TYPE from leaking out when someone has taken over */ |
| if (!strcmp(r->content_type, DIR_MAGIC_TYPE)) { |
| r->content_type = NULL; |
| } |
| return DECLINED; |
| } |
| |
| /* we're running between mod_rewrites fixup and its internal redirect handler, step aside */ |
| if (!strcmp(r->handler, REWRITE_REDIRECT_HANDLER_NAME)) { |
| /* Prevent DIR_MAGIC_TYPE from leaking out when someone has taken over */ |
| if (!strcmp(r->content_type, DIR_MAGIC_TYPE)) { |
| r->content_type = NULL; |
| } |
| return DECLINED; |
| } |
| |
| if (d->index_names) { |
| names_ptr = (char **)d->index_names->elts; |
| num_names = d->index_names->nelts; |
| } |
| else { |
| dummy_ptr[0] = AP_DEFAULT_INDEX; |
| names_ptr = dummy_ptr; |
| num_names = 1; |
| } |
| |
| for (; num_names; ++names_ptr, --num_names) { |
| /* XXX: Is this name_ptr considered escaped yet, or not??? */ |
| char *name_ptr = *names_ptr; |
| request_rec *rr; |
| |
| /* Once upon a time args were handled _after_ the successful redirect. |
| * But that redirect might then _refuse_ the given r->args, creating |
| * a nasty tangle. It seems safer to consider the r->args while we |
| * determine if name_ptr is our viable index, and therefore set them |
| * up correctly on redirect. |
| */ |
| if (r->args != NULL) { |
| name_ptr = apr_pstrcat(r->pool, name_ptr, "?", r->args, NULL); |
| } |
| |
| rr = ap_sub_req_lookup_uri(name_ptr, r, r->output_filters); |
| |
| /* The sub request lookup is very liberal, and the core map_to_storage |
| * handler will almost always result in HTTP_OK as /foo/index.html |
| * may be /foo with PATH_INFO="/index.html", or even / with |
| * PATH_INFO="/foo/index.html". To get around this we insist that the |
| * the index be a regular filetype. |
| * |
| * Another reason is that the core handler also makes the assumption |
| * that if r->finfo is still NULL by the time it gets called, the |
| * file does not exist. |
| */ |
| if (rr->status == HTTP_OK |
| && ( (rr->handler && !strcmp(rr->handler, "proxy-server")) |
| || rr->finfo.filetype == APR_REG)) { |
| |
| if (ap_is_HTTP_REDIRECT(d->redirect_index)) { |
| apr_table_setn(r->headers_out, "Location", ap_construct_url(r->pool, rr->uri, r)); |
| return d->redirect_index; |
| } |
| |
| ap_internal_fast_redirect(rr, r); |
| return OK; |
| } |
| |
| /* If the request returned a redirect, propagate it to the client */ |
| |
| if (ap_is_HTTP_REDIRECT(rr->status) |
| || (rr->status == HTTP_NOT_ACCEPTABLE && num_names == 1) |
| || (rr->status == HTTP_UNAUTHORIZED && num_names == 1)) { |
| |
| apr_pool_join(r->pool, rr->pool); |
| error_notfound = rr->status; |
| r->notes = apr_table_overlay(r->pool, r->notes, rr->notes); |
| r->headers_out = apr_table_overlay(r->pool, r->headers_out, |
| rr->headers_out); |
| r->err_headers_out = apr_table_overlay(r->pool, r->err_headers_out, |
| rr->err_headers_out); |
| return error_notfound; |
| } |
| |
| /* If the request returned something other than 404 (or 200), |
| * it means the module encountered some sort of problem. To be |
| * secure, we should return the error, rather than allow autoindex |
| * to create a (possibly unsafe) directory index. |
| * |
| * So we store the error, and if none of the listed files |
| * exist, we return the last error response we got, instead |
| * of a directory listing. |
| */ |
| if (rr->status && rr->status != HTTP_NOT_FOUND |
| && rr->status != HTTP_OK) { |
| error_notfound = rr->status; |
| } |
| |
| ap_destroy_sub_req(rr); |
| } |
| |
| if (error_notfound) { |
| return error_notfound; |
| } |
| |
| /* record what we tried, mostly for the benefit of mod_autoindex */ |
| apr_table_set(r->notes, "dir-index-names", |
| d->index_names ? |
| apr_array_pstrcat(r->pool, d->index_names, ','): |
| AP_DEFAULT_INDEX); |
| |
| /* nothing for us to do, pass on through */ |
| return DECLINED; |
| } |
| |
| static int dir_fixups(request_rec *r) |
| { |
| if (r->finfo.filetype == APR_DIR) { |
| /* serve up a directory */ |
| return fixup_dir(r); |
| } |
| else if ((r->finfo.filetype == APR_NOFILE) && (r->handler == NULL)) { |
| /* No handler and nothing in the filesystem - use fallback */ |
| return fixup_dflt(r); |
| } |
| return DECLINED; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| ap_hook_fixups(dir_fixups,NULL,NULL,APR_HOOK_LAST); |
| } |
| |
| AP_DECLARE_MODULE(dir) = { |
| STANDARD20_MODULE_STUFF, |
| create_dir_config, /* create per-directory config structure */ |
| merge_dir_configs, /* merge per-directory config structures */ |
| NULL, /* create per-server config structure */ |
| NULL, /* merge per-server config structures */ |
| dir_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
