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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.
*/
/*
* mod_dir.c: handle default index files, and trailing-/ redirects
*/
#include "apr_strings.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"
module AP_MODULE_DECLARE_DATA dir_module;
typedef enum {
SLASH_OFF = 0,
SLASH_ON,
SLASH_UNSET
} slash_cfg;
typedef struct dir_config_struct {
apr_array_header_t *index_names;
slash_cfg do_slash;
} 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;
if (!d->index_names) {
d->index_names = apr_array_make(cmd->pool, 2, sizeof(char *));
}
*(const char **)apr_array_push(d->index_names) = arg;
return NULL;
}
static const char *configure_slash(cmd_parms *cmd, void *d_, int arg)
{
dir_config_rec *d = d_;
d->do_slash = arg ? SLASH_ON : SLASH_OFF;
return NULL;
}
static const command_rec dir_cmds[] =
{
AP_INIT_ITERATE("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"),
{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 = SLASH_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 == SLASH_UNSET) ? base->do_slash : add->do_slash;
return new;
}
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;
/* only handle requests against directories */
if (r->finfo.filetype != APR_DIR) {
return DECLINED;
}
/* 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 (strcmp(r->handler, DIR_MAGIC_TYPE)) {
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, NULL);
/* XXX: (filetype == APR_REG) - we can't use a non-file index??? */
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;
}
/* 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;
}
/* nothing for us to do, pass on through */
return DECLINED;
}
static void register_hooks(apr_pool_t *p)
{
ap_hook_fixups(fixup_dir,NULL,NULL,APR_HOOK_LAST);
}
module AP_MODULE_DECLARE_DATA dir_module = {
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 */
};
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