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DEFINITIONS
This source file includes following definitions.
- APR_HOOK_STRUCT
- AP_DECLARE
- prep_walk_cache
- resolve_symlink
- core_opts_merge
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- make_sub_request
- AP_CORE_DECLARE_NONSTD
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
- AP_DECLARE
/* 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.
*/
/*
* @file request.c
* @brief functions to get and process requests
*
* @author Rob McCool 3/21/93
*
* Thoroughly revamped by rst for Apache. NB this file reads
* best from the bottom up.
*
*/
#include "apr_strings.h"
#include "apr_file_io.h"
#include "apr_fnmatch.h"
#define APR_WANT_STRFUNC
#include "apr_want.h"
#define CORE_PRIVATE
#include "ap_config.h"
#include "httpd.h"
#include "http_config.h"
#include "http_request.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_log.h"
#include "http_main.h"
#include "util_filter.h"
#include "util_charset.h"
#include "util_script.h"
#include "mod_core.h"
#if APR_HAVE_STDARG_H
#include <stdarg.h>
#endif
APR_HOOK_STRUCT(
APR_HOOK_LINK(translate_name)
APR_HOOK_LINK(map_to_storage)
APR_HOOK_LINK(check_user_id)
APR_HOOK_LINK(fixups)
APR_HOOK_LINK(type_checker)
APR_HOOK_LINK(access_checker)
APR_HOOK_LINK(auth_checker)
APR_HOOK_LINK(insert_filter)
APR_HOOK_LINK(create_request)
)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,translate_name,
(request_rec *r), (r), DECLINED)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,map_to_storage,
(request_rec *r), (r), DECLINED)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,check_user_id,
(request_rec *r), (r), DECLINED)
AP_IMPLEMENT_HOOK_RUN_ALL(int,fixups,
(request_rec *r), (r), OK, DECLINED)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,type_checker,
(request_rec *r), (r), DECLINED)
AP_IMPLEMENT_HOOK_RUN_ALL(int,access_checker,
(request_rec *r), (r), OK, DECLINED)
AP_IMPLEMENT_HOOK_RUN_FIRST(int,auth_checker,
(request_rec *r), (r), DECLINED)
AP_IMPLEMENT_HOOK_VOID(insert_filter, (request_rec *r), (r))
AP_IMPLEMENT_HOOK_RUN_ALL(int, create_request,
(request_rec *r), (r), OK, DECLINED)
static int decl_die(int status, char *phase, request_rec *r)
{
if (status == DECLINED) {
ap_log_rerror(APLOG_MARK, APLOG_CRIT, 0, r,
"configuration error: couldn't %s: %s", phase, r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
else {
return status;
}
}
/* This is the master logic for processing requests. Do NOT duplicate
* this logic elsewhere, or the security model will be broken by future
* API changes. Each phase must be individually optimized to pick up
* redundant/duplicate calls by subrequests, and redirects.
*/
AP_DECLARE(int) ap_process_request_internal(request_rec *r)
{
int file_req = (r->main && r->filename);
int access_status;
/* Ignore embedded %2F's in path for proxy requests */
if (!r->proxyreq && r->parsed_uri.path) {
core_dir_config *d;
d = ap_get_module_config(r->per_dir_config, &core_module);
if (d->allow_encoded_slashes) {
access_status = ap_unescape_url_keep2f(r->parsed_uri.path);
}
else {
access_status = ap_unescape_url(r->parsed_uri.path);
}
if (access_status) {
if (access_status == HTTP_NOT_FOUND) {
if (! d->allow_encoded_slashes) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
"found %%2f (encoded '/') in URI "
"(decoded='%s'), returning 404",
r->parsed_uri.path);
}
}
return access_status;
}
}
ap_getparents(r->uri); /* OK --- shrinking transformations... */
/* All file subrequests are a huge pain... they cannot bubble through the
* next several steps. Only file subrequests are allowed an empty uri,
* otherwise let translate_name kill the request.
*/
if (!file_req) {
if ((access_status = ap_location_walk(r))) {
return access_status;
}
if ((access_status = ap_run_translate_name(r))) {
return decl_die(access_status, "translate", r);
}
}
/* Reset to the server default config prior to running map_to_storage
*/
r->per_dir_config = r->server->lookup_defaults;
if ((access_status = ap_run_map_to_storage(r))) {
/* This request wasn't in storage (e.g. TRACE) */
return access_status;
}
/* Rerun the location walk, which overrides any map_to_storage config.
*/
if ((access_status = ap_location_walk(r))) {
return access_status;
}
/* Only on the main request! */
if (r->main == NULL) {
if ((access_status = ap_run_header_parser(r))) {
return access_status;
}
}
/* Skip authn/authz if the parent or prior request passed the authn/authz,
* and that configuration didn't change (this requires optimized _walk()
* functions in map_to_storage that use the same merge results given
* identical input.) If the config changes, we must re-auth.
*/
if (r->main && (r->main->per_dir_config == r->per_dir_config)) {
r->user = r->main->user;
r->ap_auth_type = r->main->ap_auth_type;
}
else if (r->prev && (r->prev->per_dir_config == r->per_dir_config)) {
r->user = r->prev->user;
r->ap_auth_type = r->prev->ap_auth_type;
}
else {
switch (ap_satisfies(r)) {
case SATISFY_ALL:
case SATISFY_NOSPEC:
if ((access_status = ap_run_access_checker(r)) != 0) {
return decl_die(access_status, "check access", r);
}
if (ap_some_auth_required(r)) {
if (((access_status = ap_run_check_user_id(r)) != 0)
|| !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!",
r);
}
if (((access_status = ap_run_auth_checker(r)) != 0)
|| !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!",
r);
}
}
break;
case SATISFY_ANY:
if (((access_status = ap_run_access_checker(r)) != 0)) {
if (!ap_some_auth_required(r)) {
return decl_die(access_status, "check access", r);
}
if (((access_status = ap_run_check_user_id(r)) != 0)
|| !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check user. No user file?"
: "perform authentication. AuthType not set!",
r);
}
if (((access_status = ap_run_auth_checker(r)) != 0)
|| !ap_auth_type(r)) {
return decl_die(access_status, ap_auth_type(r)
? "check access. No groups file?"
: "perform authentication. AuthType not set!",
r);
}
}
break;
}
}
/* XXX Must make certain the ap_run_type_checker short circuits mime
* in mod-proxy for r->proxyreq && r->parsed_uri.scheme
* && !strcmp(r->parsed_uri.scheme, "http")
*/
if ((access_status = ap_run_type_checker(r)) != 0) {
return decl_die(access_status, "find types", r);
}
if ((access_status = ap_run_fixups(r)) != 0) {
return access_status;
}
return OK;
}
/* Useful caching structures to repeat _walk/merge sequences as required
* when a subrequest or redirect reuses substantially the same config.
*
* Directive order in the httpd.conf file and its Includes significantly
* impact this optimization. Grouping common blocks at the front of the
* config that are less likely to change between a request and
* its subrequests, or between a request and its redirects reduced
* the work of these functions significantly.
*/
typedef struct walk_walked_t {
ap_conf_vector_t *matched; /* A dir_conf sections we matched */
ap_conf_vector_t *merged; /* The dir_conf merged result */
} walk_walked_t;
typedef struct walk_cache_t {
const char *cached; /* The identifier we matched */
ap_conf_vector_t **dir_conf_tested; /* The sections we matched against */
ap_conf_vector_t *dir_conf_merged; /* Base per_dir_config */
ap_conf_vector_t *per_dir_result; /* per_dir_config += walked result */
apr_array_header_t *walked; /* The list of walk_walked_t results */
} walk_cache_t;
static walk_cache_t *prep_walk_cache(apr_size_t t, request_rec *r)
{
walk_cache_t *cache;
void **note;
/* Find the most relevant, recent entry to work from. That would be
* this request (on the second call), or the parent request of a
* subrequest, or the prior request of an internal redirect. Provide
* this _walk()er with a copy it is allowed to munge. If there is no
* parent or prior cached request, then create a new walk cache.
*/
note = ap_get_request_note(r, t);
if (!note) {
return NULL;
}
if (!(cache = *note)) {
void **inherit_note;
if ((r->main
&& ((inherit_note = ap_get_request_note(r->main, t)))
&& *inherit_note)
|| (r->prev
&& ((inherit_note = ap_get_request_note(r->prev, t)))
&& *inherit_note)) {
cache = apr_pmemdup(r->pool, *inherit_note,
sizeof(*cache));
cache->walked = apr_array_copy(r->pool, cache->walked);
}
else {
cache = apr_pcalloc(r->pool, sizeof(*cache));
cache->walked = apr_array_make(r->pool, 4, sizeof(walk_walked_t));
}
*note = cache;
}
return cache;
}
/*****************************************************************
*
* Getting and checking directory configuration. Also checks the
* FollowSymlinks and FollowSymOwner stuff, since this is really the
* only place that can happen (barring a new mid_dir_walk callout).
*
* We can't do it as an access_checker module function which gets
* called with the final per_dir_config, since we could have a directory
* with FollowSymLinks disabled, which contains a symlink to another
* with a .htaccess file which turns FollowSymLinks back on --- and
* access in such a case must be denied. So, whatever it is that
* checks FollowSymLinks needs to know the state of the options as
* they change, all the way down.
*/
/*
* resolve_symlink must _always_ be called on an APR_LNK file type!
* It will resolve the actual target file type, modification date, etc,
* and provide any processing required for symlink evaluation.
* Path must already be cleaned, no trailing slash, no multi-slashes,
* and don't call this on the root!
*
* Simply, the number of times we deref a symlink are minimal compared
* to the number of times we had an extra lstat() since we 'weren't sure'.
*
* To optimize, we stat() anything when given (opts & OPT_SYM_LINKS), otherwise
* we start off with an lstat(). Every lstat() must be dereferenced in case
* it points at a 'nasty' - we must always rerun check_safe_file (or similar.)
*/
static int resolve_symlink(char *d, apr_finfo_t *lfi, int opts, apr_pool_t *p)
{
apr_finfo_t fi;
int res;
const char *savename;
if (!(opts & (OPT_SYM_OWNER | OPT_SYM_LINKS))) {
return HTTP_FORBIDDEN;
}
/* Save the name from the valid bits. */
savename = (lfi->valid & APR_FINFO_NAME) ? lfi->name : NULL;
if (opts & OPT_SYM_LINKS) {
if ((res = apr_stat(&fi, d, lfi->valid & ~(APR_FINFO_NAME
| APR_FINFO_LINK), p))
!= APR_SUCCESS) {
return HTTP_FORBIDDEN;
}
/* Give back the target */
memcpy(lfi, &fi, sizeof(fi));
if (savename) {
lfi->name = savename;
lfi->valid |= APR_FINFO_NAME;
}
return OK;
}
/* OPT_SYM_OWNER only works if we can get the owner of
* both the file and symlink. First fill in a missing
* owner of the symlink, then get the info of the target.
*/
if (!(lfi->valid & APR_FINFO_OWNER)) {
if ((res = apr_stat(&fi, d,
lfi->valid | APR_FINFO_LINK | APR_FINFO_OWNER, p))
!= APR_SUCCESS) {
return HTTP_FORBIDDEN;
}
}
if ((res = apr_stat(&fi, d, lfi->valid & ~(APR_FINFO_NAME), p))
!= APR_SUCCESS) {
return HTTP_FORBIDDEN;
}
if (apr_uid_compare(fi.user, lfi->user) != APR_SUCCESS) {
return HTTP_FORBIDDEN;
}
/* Give back the target */
memcpy(lfi, &fi, sizeof(fi));
if (savename) {
lfi->name = savename;
lfi->valid |= APR_FINFO_NAME;
}
return OK;
}
/*
* As we walk the directory configuration, the merged config won't
* be 'rooted' to a specific vhost until the very end of the merge.
*
* We need a very fast mini-merge to a real, vhost-rooted merge
* of core.opts and core.override, the only options tested within
* directory_walk itself.
*
* See core.c::merge_core_dir_configs() for explanation.
*/
typedef struct core_opts_t {
allow_options_t opts;
allow_options_t add;
allow_options_t remove;
overrides_t override;
overrides_t override_opts;
} core_opts_t;
static void core_opts_merge(const ap_conf_vector_t *sec, core_opts_t *opts)
{
core_dir_config *this_dir = ap_get_module_config(sec, &core_module);
if (!this_dir) {
return;
}
if (this_dir->opts & OPT_UNSET) {
opts->add = (opts->add & ~this_dir->opts_remove)
| this_dir->opts_add;
opts->remove = (opts->remove & ~this_dir->opts_add)
| this_dir->opts_remove;
opts->opts = (opts->opts & ~opts->remove) | opts->add;
}
else {
opts->opts = this_dir->opts;
opts->add = this_dir->opts_add;
opts->remove = this_dir->opts_remove;
}
if (!(this_dir->override & OR_UNSET)) {
opts->override = this_dir->override;
opts->override_opts = this_dir->override_opts;
}
}
/*****************************************************************
*
* Getting and checking directory configuration. Also checks the
* FollowSymlinks and FollowSymOwner stuff, since this is really the
* only place that can happen (barring a new mid_dir_walk callout).
*
* We can't do it as an access_checker module function which gets
* called with the final per_dir_config, since we could have a directory
* with FollowSymLinks disabled, which contains a symlink to another
* with a .htaccess file which turns FollowSymLinks back on --- and
* access in such a case must be denied. So, whatever it is that
* checks FollowSymLinks needs to know the state of the options as
* they change, all the way down.
*/
AP_DECLARE(int) ap_directory_walk(request_rec *r)
{
ap_conf_vector_t *now_merged = NULL;
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
ap_conf_vector_t **sec_ent = (ap_conf_vector_t **) sconf->sec_dir->elts;
int num_sec = sconf->sec_dir->nelts;
walk_cache_t *cache;
char *entry_dir;
apr_status_t rv;
/* XXX: Better (faster) tests needed!!!
*
* "OK" as a response to a real problem is not _OK_, but to allow broken
* modules to proceed, we will permit the not-a-path filename to pass the
* following two tests. This behavior may be revoked in future versions
* of Apache. We still must catch it later if it's heading for the core
* handler. Leave INFO notes here for module debugging.
*/
if (r->filename == NULL) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
"Module bug? Request filename is missing for URI %s",
r->uri);
return OK;
}
/* Canonicalize the file path without resolving filename case or aliases
* so we can begin by checking the cache for a recent directory walk.
* This call will ensure we have an absolute path in the same pass.
*/
if ((rv = apr_filepath_merge(&entry_dir, NULL, r->filename,
APR_FILEPATH_NOTRELATIVE, r->pool))
!= APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
"Module bug? Request filename path %s is invalid or "
"or not absolute for uri %s",
r->filename, r->uri);
return OK;
}
/* XXX Notice that this forces path_info to be canonical. That might
* not be desired by all apps. However, some of those same apps likely
* have significant security holes.
*/
r->filename = entry_dir;
cache = prep_walk_cache(AP_NOTE_DIRECTORY_WALK, r);
/* If this is not a dirent subrequest with a preconstructed
* r->finfo value, then we can simply stat the filename to
* save burning mega-cycles with unneeded stats - if this is
* an exact file match. We don't care about failure... we
* will stat by component failing this meager attempt.
*
* It would be nice to distinguish APR_ENOENT from other
* types of failure, such as APR_ENOTDIR. We can do something
* with APR_ENOENT, knowing that the path is good.
*/
if (!r->finfo.filetype || r->finfo.filetype == APR_LNK) {
rv = apr_stat(&r->finfo, r->filename, APR_FINFO_MIN, r->pool);
/* some OSs will return APR_SUCCESS/APR_REG if we stat
* a regular file but we have '/' at the end of the name;
*
* other OSs will return APR_ENOTDIR for that situation;
*
* handle it the same everywhere by simulating a failure
* if it looks like a directory but really isn't
*
* Also reset if the stat failed, just for safety.
*/
if ((rv != APR_SUCCESS) ||
(r->finfo.filetype &&
(r->finfo.filetype != APR_DIR) &&
(r->filename[strlen(r->filename) - 1] == '/'))) {
r->finfo.filetype = 0; /* forget what we learned */
}
}
if (r->finfo.filetype == APR_REG) {
entry_dir = ap_make_dirstr_parent(r->pool, entry_dir);
}
else if (r->filename[strlen(r->filename) - 1] != '/') {
entry_dir = apr_pstrcat(r->pool, r->filename, "/", NULL);
}
/* If we have a file already matches the path of r->filename,
* and the vhost's list of directory sections hasn't changed,
* we can skip rewalking the directory_walk entries.
*/
if (cache->cached
&& ((r->finfo.filetype == APR_REG)
|| ((r->finfo.filetype == APR_DIR)
&& (!r->path_info || !*r->path_info)))
&& (cache->dir_conf_tested == sec_ent)
&& (strcmp(entry_dir, cache->cached) == 0)) {
/* Well this looks really familiar! If our end-result (per_dir_result)
* didn't change, we have absolutely nothing to do :)
* Otherwise (as is the case with most dir_merged/file_merged requests)
* we must merge our dir_conf_merged onto this new r->per_dir_config.
*/
if (r->per_dir_config == cache->per_dir_result) {
return OK;
}
if (r->per_dir_config == cache->dir_conf_merged) {
r->per_dir_config = cache->per_dir_result;
return OK;
}
if (cache->walked->nelts) {
now_merged = ((walk_walked_t*)cache->walked->elts)
[cache->walked->nelts - 1].merged;
}
}
else {
/* We start now_merged from NULL since we want to build
* a locations list that can be merged to any vhost.
*/
int sec_idx;
int matches = cache->walked->nelts;
walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts;
core_dir_config *this_dir;
core_opts_t opts;
apr_finfo_t thisinfo;
char *save_path_info;
apr_size_t buflen;
char *buf;
unsigned int seg, startseg;
/* Invariant: from the first time filename_len is set until
* it goes out of scope, filename_len==strlen(r->filename)
*/
apr_size_t filename_len;
#ifdef CASE_BLIND_FILESYSTEM
apr_size_t canonical_len;
#endif
/*
* We must play our own mini-merge game here, for the few
* running dir_config values we care about within dir_walk.
* We didn't start the merge from r->per_dir_config, so we
* accumulate opts and override as we merge, from the globals.
*/
this_dir = ap_get_module_config(r->per_dir_config, &core_module);
opts.opts = this_dir->opts;
opts.add = this_dir->opts_add;
opts.remove = this_dir->opts_remove;
opts.override = this_dir->override;
opts.override_opts = this_dir->override_opts;
/* Set aside path_info to merge back onto path_info later.
* If r->filename is a directory, we must remerge the path_info,
* before we continue! [Directories cannot, by defintion, have
* path info. Either the next segment is not-found, or a file.]
*
* r->path_info tracks the unconsumed source path.
* r->filename tracks the path as we process it
*/
if ((r->finfo.filetype == APR_DIR) && r->path_info && *r->path_info)
{
if ((rv = apr_filepath_merge(&r->path_info, r->filename,
r->path_info,
APR_FILEPATH_NOTABOVEROOT, r->pool))
!= APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"dir_walk error, path_info %s is not relative "
"to the filename path %s for uri %s",
r->path_info, r->filename, r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
save_path_info = NULL;
}
else {
save_path_info = r->path_info;
r->path_info = r->filename;
}
#ifdef CASE_BLIND_FILESYSTEM
canonical_len = 0;
while (r->canonical_filename && r->canonical_filename[canonical_len]
&& (r->canonical_filename[canonical_len]
== r->path_info[canonical_len])) {
++canonical_len;
}
while (canonical_len
&& ((r->canonical_filename[canonical_len - 1] != '/'
&& r->canonical_filename[canonical_len - 1])
|| (r->path_info[canonical_len - 1] != '/'
&& r->path_info[canonical_len - 1]))) {
--canonical_len;
}
/*
* Now build r->filename component by component, starting
* with the root (on Unix, simply "/"). We will make a huge
* assumption here for efficiency, that any canonical path
* already given included a canonical root.
*/
rv = apr_filepath_root((const char **)&r->filename,
(const char **)&r->path_info,
canonical_len ? 0 : APR_FILEPATH_TRUENAME,
r->pool);
filename_len = strlen(r->filename);
/*
* Bad assumption above? If the root's length is longer
* than the canonical length, then it cannot be trusted as
* a truename. So try again, this time more seriously.
*/
if ((rv == APR_SUCCESS) && canonical_len
&& (filename_len > canonical_len)) {
rv = apr_filepath_root((const char **)&r->filename,
(const char **)&r->path_info,
APR_FILEPATH_TRUENAME, r->pool);
filename_len = strlen(r->filename);
canonical_len = 0;
}
#else /* ndef CASE_BLIND_FILESYSTEM, really this simple for Unix today; */
rv = apr_filepath_root((const char **)&r->filename,
(const char **)&r->path_info,
0, r->pool);
filename_len = strlen(r->filename);
#endif
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"dir_walk error, could not determine the root "
"path of filename %s%s for uri %s",
r->filename, r->path_info, r->uri);
return HTTP_INTERNAL_SERVER_ERROR;
}
/* Working space for terminating null and an extra / is required.
*/
buflen = filename_len + strlen(r->path_info) + 2;
buf = apr_palloc(r->pool, buflen);
memcpy(buf, r->filename, filename_len + 1);
r->filename = buf;
thisinfo.valid = APR_FINFO_TYPE;
thisinfo.filetype = APR_DIR; /* It's the root, of course it's a dir */
/*
* seg keeps track of which segment we've copied.
* sec_idx keeps track of which section we're on, since sections are
* ordered by number of segments. See core_reorder_directories
* startseg tells us how many segments describe the root path
* e.g. the complete path "//host/foo/" to a UNC share (4)
*/
startseg = seg = ap_count_dirs(r->filename);
sec_idx = 0;
/*
* Go down the directory hierarchy. Where we have to check for
* symlinks, do so. Where a .htaccess file has permission to
* override anything, try to find one.
*/
do {
int res;
char *seg_name;
char *delim;
int temp_slash=0;
/* We have no trailing slash, but we sure would appreciate one.
* However, we don't want to append a / our first time through.
*/
if ((seg > startseg) && r->filename[filename_len-1] != '/') {
r->filename[filename_len++] = '/';
r->filename[filename_len] = 0;
temp_slash=1;
}
/* Begin *this* level by looking for matching <Directory> sections
* from the server config.
*/
for (; sec_idx < num_sec; ++sec_idx) {
ap_conf_vector_t *entry_config = sec_ent[sec_idx];
core_dir_config *entry_core;
entry_core = ap_get_module_config(entry_config, &core_module);
/* No more possible matches for this many segments?
* We are done when we find relative/regex/longer components.
*/
if (entry_core->r || entry_core->d_components > seg) {
break;
}
/* We will never skip '0' element components, e.g. plain old
* <Directory >, and <Directory "/"> are classified as zero
* so that Win32/Netware/OS2 etc all pick them up.
* Otherwise, skip over the mismatches.
*/
if (entry_core->d_components
&& ((entry_core->d_components < seg)
|| (entry_core->d_is_fnmatch
? (apr_fnmatch(entry_core->d, r->filename,
APR_FNM_PATHNAME) != APR_SUCCESS)
: (strcmp(r->filename, entry_core->d) != 0)))) {
continue;
}
/* If we haven't continue'd above, we have a match.
*
* Calculate our full-context core opts & override.
*/
core_opts_merge(sec_ent[sec_idx], &opts);
/* If we merged this same section last time, reuse it
*/
if (matches) {
if (last_walk->matched == sec_ent[sec_idx]) {
now_merged = last_walk->merged;
++last_walk;
--matches;
continue;
}
/* We fell out of sync. This is our own copy of walked,
* so truncate the remaining matches and reset remaining.
*/
cache->walked->nelts -= matches;
matches = 0;
}
if (now_merged) {
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
sec_ent[sec_idx]);
}
else {
now_merged = sec_ent[sec_idx];
}
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = sec_ent[sec_idx];
last_walk->merged = now_merged;
}
/* If .htaccess files are enabled, check for one, provided we
* have reached a real path.
*/
do { /* Not really a loop, just a break'able code block */
ap_conf_vector_t *htaccess_conf = NULL;
/* No htaccess in an incomplete root path,
* nor if it's disabled
*/
if (seg < startseg || !opts.override) {
break;
}
res = ap_parse_htaccess(&htaccess_conf, r, opts.override,
opts.override_opts,
apr_pstrdup(r->pool, r->filename),
sconf->access_name);
if (res) {
return res;
}
if (!htaccess_conf) {
break;
}
/* If we are still here, we found our htaccess.
*
* Calculate our full-context core opts & override.
*/
core_opts_merge(htaccess_conf, &opts);
/* If we merged this same htaccess last time, reuse it...
* this wouldn't work except that we cache the htaccess
* sections for the lifetime of the request, so we match
* the same conf. Good planning (no, pure luck ;)
*/
if (matches) {
if (last_walk->matched == htaccess_conf) {
now_merged = last_walk->merged;
++last_walk;
--matches;
break;
}
/* We fell out of sync. This is our own copy of walked,
* so truncate the remaining matches and reset
* remaining.
*/
cache->walked->nelts -= matches;
matches = 0;
}
if (now_merged) {
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
htaccess_conf);
}
else {
now_merged = htaccess_conf;
}
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = htaccess_conf;
last_walk->merged = now_merged;
} while (0); /* Only one htaccess, not a real loop */
/* That temporary trailing slash was useful, now drop it.
*/
if (temp_slash) {
r->filename[--filename_len] = '\0';
}
/* Time for all good things to come to an end?
*/
if (!r->path_info || !*r->path_info) {
break;
}
/* Now it's time for the next segment...
* We will assume the next element is an end node, and fix it up
* below as necessary...
*/
seg_name = r->filename + filename_len;
delim = strchr(r->path_info + (*r->path_info == '/' ? 1 : 0), '/');
if (delim) {
size_t path_info_len = delim - r->path_info;
*delim = '\0';
memcpy(seg_name, r->path_info, path_info_len + 1);
filename_len += path_info_len;
r->path_info = delim;
*delim = '/';
}
else {
size_t path_info_len = strlen(r->path_info);
memcpy(seg_name, r->path_info, path_info_len + 1);
filename_len += path_info_len;
r->path_info += path_info_len;
}
if (*seg_name == '/')
++seg_name;
/* If nothing remained but a '/' string, we are finished
* XXX: NO WE ARE NOT!!! Now process this puppy!!! */
if (!*seg_name) {
break;
}
/* First optimization;
* If...we knew r->filename was a file, and
* if...we have strict (case-sensitive) filenames, or
* we know the canonical_filename matches to _this_ name, and
* if...we have allowed symlinks
* skip the lstat and dummy up an APR_DIR value for thisinfo.
*/
if (r->finfo.filetype
#ifdef CASE_BLIND_FILESYSTEM
&& (filename_len <= canonical_len)
#endif
&& ((opts.opts & (OPT_SYM_OWNER | OPT_SYM_LINKS)) == OPT_SYM_LINKS))
{
thisinfo.filetype = APR_DIR;
++seg;
continue;
}
/* We choose apr_stat with flag APR_FINFO_LINK here, rather that
* plain apr_stat, so that we capture this path object rather than
* its target. We will replace the info with our target's info
* below. We especially want the name of this 'link' object, not
* the name of its target, if we are fixing the filename
* case/resolving aliases.
*/
rv = apr_stat(&thisinfo, r->filename,
APR_FINFO_MIN | APR_FINFO_NAME | APR_FINFO_LINK,
r->pool);
if (APR_STATUS_IS_ENOENT(rv)) {
/* Nothing? That could be nice. But our directory
* walk is done.
*/
thisinfo.filetype = APR_NOFILE;
break;
}
else if (APR_STATUS_IS_EACCES(rv)) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"access to %s denied", r->uri);
return r->status = HTTP_FORBIDDEN;
}
else if ((rv != APR_SUCCESS && rv != APR_INCOMPLETE)
|| !(thisinfo.valid & APR_FINFO_TYPE)) {
/* If we hit ENOTDIR, we must have over-optimized, deny
* rather than assume not found.
*/
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
"access to %s failed", r->uri);
return r->status = HTTP_FORBIDDEN;
}
/* Fix up the path now if we have a name, and they don't agree
*/
if ((thisinfo.valid & APR_FINFO_NAME)
&& strcmp(seg_name, thisinfo.name)) {
/* TODO: provide users an option that an internal/external
* redirect is required here? We need to walk the URI and
* filename in tandem to properly correlate these.
*/
strcpy(seg_name, thisinfo.name);
filename_len = strlen(r->filename);
}
if (thisinfo.filetype == APR_LNK) {
/* Is this a possibly acceptable symlink?
*/
if ((res = resolve_symlink(r->filename, &thisinfo,
opts.opts, r->pool)) != OK) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Symbolic link not allowed "
"or link target not accessible: %s",
r->filename);
return r->status = res;
}
}
/* Ok, we are done with the link's info, test the real target
*/
if (thisinfo.filetype == APR_REG ||
thisinfo.filetype == APR_NOFILE) {
/* That was fun, nothing left for us here
*/
break;
}
else if (thisinfo.filetype != APR_DIR) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Forbidden: %s doesn't point to "
"a file or directory",
r->filename);
return r->status = HTTP_FORBIDDEN;
}
++seg;
} while (thisinfo.filetype == APR_DIR);
/* If we have _not_ optimized, this is the time to recover
* the final stat result.
*/
if (!r->finfo.filetype || r->finfo.filetype == APR_LNK) {
r->finfo = thisinfo;
}
/* Now splice the saved path_info back onto any new path_info
*/
if (save_path_info) {
if (r->path_info && *r->path_info) {
r->path_info = ap_make_full_path(r->pool, r->path_info,
save_path_info);
}
else {
r->path_info = save_path_info;
}
}
/*
* Now we'll deal with the regexes, note we pick up sec_idx
* where we left off (we gave up after we hit entry_core->r)
*/
for (; sec_idx < num_sec; ++sec_idx) {
core_dir_config *entry_core;
entry_core = ap_get_module_config(sec_ent[sec_idx], &core_module);
if (!entry_core->r) {
continue;
}
if (ap_regexec(entry_core->r, r->filename, 0, NULL, AP_REG_NOTEOL)) {
continue;
}
/* If we haven't already continue'd above, we have a match.
*
* Calculate our full-context core opts & override.
*/
core_opts_merge(sec_ent[sec_idx], &opts);
/* If we merged this same section last time, reuse it
*/
if (matches) {
if (last_walk->matched == sec_ent[sec_idx]) {
now_merged = last_walk->merged;
++last_walk;
--matches;
continue;
}
/* We fell out of sync. This is our own copy of walked,
* so truncate the remaining matches and reset remaining.
*/
cache->walked->nelts -= matches;
matches = 0;
}
if (now_merged) {
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
sec_ent[sec_idx]);
}
else {
now_merged = sec_ent[sec_idx];
}
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = sec_ent[sec_idx];
last_walk->merged = now_merged;
}
/* Whoops - everything matched in sequence, but the original walk
* found some additional matches. Truncate them.
*/
if (matches) {
cache->walked->nelts -= matches;
}
}
/* It seems this shouldn't be needed anymore. We translated the
x symlink above into a real resource, and should have died up there.
x Even if we keep this, it needs more thought (maybe an r->file_is_symlink)
x perhaps it should actually happen in file_walk, so we catch more
x obscure cases in autoindex subrequests, etc.
x
x * Symlink permissions are determined by the parent. If the request is
x * for a directory then applying the symlink test here would use the
x * permissions of the directory as opposed to its parent. Consider a
x * symlink pointing to a dir with a .htaccess disallowing symlinks. If
x * you access /symlink (or /symlink/) you would get a 403 without this
x * APR_DIR test. But if you accessed /symlink/index.html, for example,
x * you would *not* get the 403.
x
x if (r->finfo.filetype != APR_DIR
x && (res = resolve_symlink(r->filename, r->info, ap_allow_options(r),
x r->pool))) {
x ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
x "Symbolic link not allowed: %s", r->filename);
x return res;
x }
*/
/* Save future sub-requestors much angst in processing
* this subrequest. If dir_walk couldn't canonicalize
* the file path, nothing can.
*/
r->canonical_filename = r->filename;
if (r->finfo.filetype == APR_DIR) {
cache->cached = r->filename;
}
else {
cache->cached = ap_make_dirstr_parent(r->pool, r->filename);
}
cache->dir_conf_tested = sec_ent;
cache->dir_conf_merged = r->per_dir_config;
/* Merge our cache->dir_conf_merged construct with the r->per_dir_configs,
* and note the end result to (potentially) skip this step next time.
*/
if (now_merged) {
r->per_dir_config = ap_merge_per_dir_configs(r->pool,
r->per_dir_config,
now_merged);
}
cache->per_dir_result = r->per_dir_config;
return OK;
}
AP_DECLARE(int) ap_location_walk(request_rec *r)
{
ap_conf_vector_t *now_merged = NULL;
core_server_config *sconf = ap_get_module_config(r->server->module_config,
&core_module);
ap_conf_vector_t **sec_ent = (ap_conf_vector_t **)sconf->sec_url->elts;
int num_sec = sconf->sec_url->nelts;
walk_cache_t *cache;
const char *entry_uri;
/* No tricks here, there are no <Locations > to parse in this vhost.
* We won't destroy the cache, just in case _this_ redirect is later
* redirected again to a vhost with <Location > blocks to optimize.
*/
if (!num_sec) {
return OK;
}
cache = prep_walk_cache(AP_NOTE_LOCATION_WALK, r);
/* Location and LocationMatch differ on their behaviour w.r.t. multiple
* slashes. Location matches multiple slashes with a single slash,
* LocationMatch doesn't. An exception, for backwards brokenness is
* absoluteURIs... in which case neither match multiple slashes.
*/
if (r->uri[0] != '/') {
entry_uri = r->uri;
}
else {
char *uri = apr_pstrdup(r->pool, r->uri);
ap_no2slash(uri);
entry_uri = uri;
}
/* If we have an cache->cached location that matches r->uri,
* and the vhost's list of locations hasn't changed, we can skip
* rewalking the location_walk entries.
*/
if (cache->cached
&& (cache->dir_conf_tested == sec_ent)
&& (strcmp(entry_uri, cache->cached) == 0)) {
/* Well this looks really familiar! If our end-result (per_dir_result)
* didn't change, we have absolutely nothing to do :)
* Otherwise (as is the case with most dir_merged/file_merged requests)
* we must merge our dir_conf_merged onto this new r->per_dir_config.
*/
if (r->per_dir_config == cache->per_dir_result) {
return OK;
}
if (r->per_dir_config == cache->dir_conf_merged) {
r->per_dir_config = cache->per_dir_result;
return OK;
}
if (cache->walked->nelts) {
now_merged = ((walk_walked_t*)cache->walked->elts)
[cache->walked->nelts - 1].merged;
}
}
else {
/* We start now_merged from NULL since we want to build
* a locations list that can be merged to any vhost.
*/
int len, sec_idx;
int matches = cache->walked->nelts;
walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts;
cache->cached = entry_uri;
/* Go through the location entries, and check for matches.
* We apply the directive sections in given order, we should
* really try them with the most general first.
*/
for (sec_idx = 0; sec_idx < num_sec; ++sec_idx) {
core_dir_config *entry_core;
entry_core = ap_get_module_config(sec_ent[sec_idx], &core_module);
/* ### const strlen can be optimized in location config parsing */
len = strlen(entry_core->d);
/* Test the regex, fnmatch or string as appropriate.
* If it's a strcmp, and the <Location > pattern was
* not slash terminated, then this uri must be slash
* terminated (or at the end of the string) to match.
*/
if (entry_core->r
? ap_regexec(entry_core->r, r->uri, 0, NULL, 0)
: (entry_core->d_is_fnmatch
? apr_fnmatch(entry_core->d, cache->cached, APR_FNM_PATHNAME)
: (strncmp(entry_core->d, cache->cached, len)
|| (entry_core->d[len - 1] != '/'
&& cache->cached[len] != '/'
&& cache->cached[len] != '\0')))) {
continue;
}
/* If we merged this same section last time, reuse it
*/
if (matches) {
if (last_walk->matched == sec_ent[sec_idx]) {
now_merged = last_walk->merged;
++last_walk;
--matches;
continue;
}
/* We fell out of sync. This is our own copy of walked,
* so truncate the remaining matches and reset remaining.
*/
cache->walked->nelts -= matches;
matches = 0;
}
if (now_merged) {
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
sec_ent[sec_idx]);
}
else {
now_merged = sec_ent[sec_idx];
}
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = sec_ent[sec_idx];
last_walk->merged = now_merged;
}
/* Whoops - everything matched in sequence, but the original walk
* found some additional matches. Truncate them.
*/
if (matches) {
cache->walked->nelts -= matches;
}
}
cache->dir_conf_tested = sec_ent;
cache->dir_conf_merged = r->per_dir_config;
/* Merge our cache->dir_conf_merged construct with the r->per_dir_configs,
* and note the end result to (potentially) skip this step next time.
*/
if (now_merged) {
r->per_dir_config = ap_merge_per_dir_configs(r->pool,
r->per_dir_config,
now_merged);
}
cache->per_dir_result = r->per_dir_config;
return OK;
}
AP_DECLARE(int) ap_file_walk(request_rec *r)
{
ap_conf_vector_t *now_merged = NULL;
core_dir_config *dconf = ap_get_module_config(r->per_dir_config,
&core_module);
ap_conf_vector_t **sec_ent = (ap_conf_vector_t **)dconf->sec_file->elts;
int num_sec = dconf->sec_file->nelts;
walk_cache_t *cache;
const char *test_file;
/* To allow broken modules to proceed, we allow missing filenames to pass.
* We will catch it later if it's heading for the core handler.
* directory_walk already posted an INFO note for module debugging.
*/
if (r->filename == NULL) {
return OK;
}
cache = prep_walk_cache(AP_NOTE_FILE_WALK, r);
/* No tricks here, there are just no <Files > to parse in this context.
* We won't destroy the cache, just in case _this_ redirect is later
* redirected again to a context containing the same or similar <Files >.
*/
if (!num_sec) {
return OK;
}
/* Get the basename .. and copy for the cache just
* in case r->filename is munged by another module
*/
test_file = strrchr(r->filename, '/');
if (test_file == NULL) {
test_file = apr_pstrdup(r->pool, r->filename);
}
else {
test_file = apr_pstrdup(r->pool, ++test_file);
}
/* If we have an cache->cached file name that matches test_file,
* and the directory's list of file sections hasn't changed, we
* can skip rewalking the file_walk entries.
*/
if (cache->cached
&& (cache->dir_conf_tested == sec_ent)
&& (strcmp(test_file, cache->cached) == 0)) {
/* Well this looks really familiar! If our end-result (per_dir_result)
* didn't change, we have absolutely nothing to do :)
* Otherwise (as is the case with most dir_merged requests)
* we must merge our dir_conf_merged onto this new r->per_dir_config.
*/
if (r->per_dir_config == cache->per_dir_result) {
return OK;
}
if (r->per_dir_config == cache->dir_conf_merged) {
r->per_dir_config = cache->per_dir_result;
return OK;
}
if (cache->walked->nelts) {
now_merged = ((walk_walked_t*)cache->walked->elts)
[cache->walked->nelts - 1].merged;
}
}
else {
/* We start now_merged from NULL since we want to build
* a file section list that can be merged to any dir_walk.
*/
int sec_idx;
int matches = cache->walked->nelts;
walk_walked_t *last_walk = (walk_walked_t*)cache->walked->elts;
cache->cached = test_file;
/* Go through the location entries, and check for matches.
* We apply the directive sections in given order, we should
* really try them with the most general first.
*/
for (sec_idx = 0; sec_idx < num_sec; ++sec_idx) {
core_dir_config *entry_core;
entry_core = ap_get_module_config(sec_ent[sec_idx], &core_module);
if (entry_core->r
? ap_regexec(entry_core->r, cache->cached , 0, NULL, 0)
: (entry_core->d_is_fnmatch
? apr_fnmatch(entry_core->d, cache->cached, APR_FNM_PATHNAME)
: strcmp(entry_core->d, cache->cached))) {
continue;
}
/* If we merged this same section last time, reuse it
*/
if (matches) {
if (last_walk->matched == sec_ent[sec_idx]) {
now_merged = last_walk->merged;
++last_walk;
--matches;
continue;
}
/* We fell out of sync. This is our own copy of walked,
* so truncate the remaining matches and reset remaining.
*/
cache->walked->nelts -= matches;
matches = 0;
}
if (now_merged) {
now_merged = ap_merge_per_dir_configs(r->pool,
now_merged,
sec_ent[sec_idx]);
}
else {
now_merged = sec_ent[sec_idx];
}
last_walk = (walk_walked_t*)apr_array_push(cache->walked);
last_walk->matched = sec_ent[sec_idx];
last_walk->merged = now_merged;
}
/* Whoops - everything matched in sequence, but the original walk
* found some additional matches. Truncate them.
*/
if (matches) {
cache->walked->nelts -= matches;
}
}
cache->dir_conf_tested = sec_ent;
cache->dir_conf_merged = r->per_dir_config;
/* Merge our cache->dir_conf_merged construct with the r->per_dir_configs,
* and note the end result to (potentially) skip this step next time.
*/
if (now_merged) {
r->per_dir_config = ap_merge_per_dir_configs(r->pool,
r->per_dir_config,
now_merged);
}
cache->per_dir_result = r->per_dir_config;
return OK;
}
/*****************************************************************
*
* The sub_request mechanism.
*
* Fns to look up a relative URI from, e.g., a map file or SSI document.
* These do all access checks, etc., but don't actually run the transaction
* ... use run_sub_req below for that. Also, be sure to use destroy_sub_req
* as appropriate if you're likely to be creating more than a few of these.
* (An early Apache version didn't destroy the sub_reqs used in directory
* indexing. The result, when indexing a directory with 800-odd files in
* it, was massively excessive storage allocation).
*
* Note more manipulation of protocol-specific vars in the request
* structure...
*/
static request_rec *make_sub_request(const request_rec *r,
ap_filter_t *next_filter)
{
apr_pool_t *rrp;
request_rec *rnew;
apr_pool_create(&rrp, r->pool);
apr_pool_tag(rrp, "subrequest");
rnew = apr_pcalloc(rrp, sizeof(request_rec));
rnew->pool = rrp;
rnew->hostname = r->hostname;
rnew->request_time = r->request_time;
rnew->connection = r->connection;
rnew->server = r->server;
rnew->request_config = ap_create_request_config(rnew->pool);
/* Start a clean config from this subrequest's vhost. Optimization in
* Location/File/Dir walks from the parent request assure that if the
* config blocks of the subrequest match the parent request, no merges
* will actually occur (and generally a minimal number of merges are
* required, even if the parent and subrequest aren't quite identical.)
*/
rnew->per_dir_config = r->server->lookup_defaults;
rnew->htaccess = r->htaccess;
rnew->allowed_methods = ap_make_method_list(rnew->pool, 2);
/* make a copy of the allowed-methods list */
ap_copy_method_list(rnew->allowed_methods, r->allowed_methods);
/* start with the same set of output filters */
if (next_filter) {
/* while there are no input filters for a subrequest, we will
* try to insert some, so if we don't have valid data, the code
* will seg fault.
*/
rnew->input_filters = r->input_filters;
rnew->proto_input_filters = r->proto_input_filters;
rnew->output_filters = next_filter;
rnew->proto_output_filters = r->proto_output_filters;
ap_add_output_filter_handle(ap_subreq_core_filter_handle,
NULL, rnew, rnew->connection);
}
else {
/* If NULL - we are expecting to be internal_fast_redirect'ed
* to this subrequest - or this request will never be invoked.
* Ignore the original request filter stack entirely, and
* drill the input and output stacks back to the connection.
*/
rnew->proto_input_filters = r->proto_input_filters;
rnew->proto_output_filters = r->proto_output_filters;
rnew->input_filters = r->proto_input_filters;
rnew->output_filters = r->proto_output_filters;
}
/* no input filters for a subrequest */
ap_set_sub_req_protocol(rnew, r);
/* We have to run this after we fill in sub req vars,
* or the r->main pointer won't be setup
*/
ap_run_create_request(rnew);
/* Begin by presuming any module can make its own path_info assumptions,
* until some module interjects and changes the value.
*/
rnew->used_path_info = AP_REQ_DEFAULT_PATH_INFO;
return rnew;
}
AP_CORE_DECLARE_NONSTD(apr_status_t) ap_sub_req_output_filter(ap_filter_t *f,
apr_bucket_brigade *bb)
{
apr_bucket *e = APR_BRIGADE_LAST(bb);
if (APR_BUCKET_IS_EOS(e)) {
apr_bucket_delete(e);
}
if (!APR_BRIGADE_EMPTY(bb)) {
return ap_pass_brigade(f->next, bb);
}
return APR_SUCCESS;
}
AP_DECLARE(int) ap_some_auth_required(request_rec *r)
{
/* Is there a require line configured for the type of *this* req? */
const apr_array_header_t *reqs_arr = ap_requires(r);
require_line *reqs;
int i;
if (!reqs_arr) {
return 0;
}
reqs = (require_line *) reqs_arr->elts;
for (i = 0; i < reqs_arr->nelts; ++i) {
if (reqs[i].method_mask & (AP_METHOD_BIT << r->method_number)) {
return 1;
}
}
return 0;
}
AP_DECLARE(request_rec *) ap_sub_req_method_uri(const char *method,
const char *new_uri,
const request_rec *r,
ap_filter_t *next_filter)
{
request_rec *rnew;
/* Initialise res, to avoid a gcc warning */
int res = HTTP_INTERNAL_SERVER_ERROR;
char *udir;
rnew = make_sub_request(r, next_filter);
/* would be nicer to pass "method" to ap_set_sub_req_protocol */
rnew->method = method;
rnew->method_number = ap_method_number_of(method);
if (new_uri[0] == '/') {
ap_parse_uri(rnew, new_uri);
}
else {
udir = ap_make_dirstr_parent(rnew->pool, r->uri);
udir = ap_escape_uri(rnew->pool, udir); /* re-escape it */
ap_parse_uri(rnew, ap_make_full_path(rnew->pool, udir, new_uri));
}
/* We cannot return NULL without violating the API. So just turn this
* subrequest into a 500 to indicate the failure. */
if (ap_is_recursion_limit_exceeded(r)) {
rnew->status = HTTP_INTERNAL_SERVER_ERROR;
return rnew;
}
/* lookup_uri
* If the content can be served by the quick_handler, we can
* safely bypass request_internal processing.
*
* If next_filter is NULL we are expecting to be
* internal_fast_redirect'ed to the subrequest, or the subrequest will
* never be invoked. We need to make sure that the quickhandler is not
* invoked by any lookups. Since an internal_fast_redirect will always
* occur too late for the quickhandler to handle the request.
*/
if (next_filter) {
res = ap_run_quick_handler(rnew, 1);
}
if (next_filter == NULL || res != OK) {
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
}
return rnew;
}
AP_DECLARE(request_rec *) ap_sub_req_lookup_uri(const char *new_uri,
const request_rec *r,
ap_filter_t *next_filter)
{
return ap_sub_req_method_uri("GET", new_uri, r, next_filter);
}
AP_DECLARE(request_rec *) ap_sub_req_lookup_dirent(const apr_finfo_t *dirent,
const request_rec *r,
int subtype,
ap_filter_t *next_filter)
{
request_rec *rnew;
int res;
char *fdir;
char *udir;
rnew = make_sub_request(r, next_filter);
/* Special case: we are looking at a relative lookup in the same directory.
* This is 100% safe, since dirent->name just came from the filesystem.
*/
if (r->path_info && *r->path_info) {
/* strip path_info off the end of the uri to keep it in sync
* with r->filename, which has already been stripped by directory_walk,
* merge the dirent->name, and then, if the caller wants us to remerge
* the original path info, do so. Note we never fix the path_info back
* to r->filename, since dir_walk would do so (but we don't expect it
* to happen in the usual cases)
*/
udir = apr_pstrdup(rnew->pool, r->uri);
udir[ap_find_path_info(udir, r->path_info)] = '\0';
udir = ap_make_dirstr_parent(rnew->pool, udir);
rnew->uri = ap_make_full_path(rnew->pool, udir, dirent->name);
if (subtype == AP_SUBREQ_MERGE_ARGS) {
rnew->uri = ap_make_full_path(rnew->pool, rnew->uri, r->path_info + 1);
rnew->path_info = apr_pstrdup(rnew->pool, r->path_info);
}
rnew->uri = ap_escape_uri(rnew->pool, rnew->uri);
}
else {
udir = ap_make_dirstr_parent(rnew->pool, r->uri);
rnew->uri = ap_escape_uri(rnew->pool, ap_make_full_path(rnew->pool,
udir,
dirent->name));
}
fdir = ap_make_dirstr_parent(rnew->pool, r->filename);
rnew->filename = ap_make_full_path(rnew->pool, fdir, dirent->name);
if (r->canonical_filename == r->filename) {
rnew->canonical_filename = rnew->filename;
}
/* XXX This is now less relevant; we will do a full location walk
* these days for this case. Preserve the apr_stat results, and
* perhaps we also tag that symlinks were tested and/or found for
* r->filename.
*/
rnew->per_dir_config = r->server->lookup_defaults;
if ((dirent->valid & APR_FINFO_MIN) != APR_FINFO_MIN) {
/*
* apr_dir_read isn't very complete on this platform, so
* we need another apr_stat (with or without APR_FINFO_LINK
* depending on whether we allow all symlinks here.) If this
* is an APR_LNK that resolves to an APR_DIR, then we will rerun
* everything anyways... this should be safe.
*/
apr_status_t rv;
if (ap_allow_options(rnew) & OPT_SYM_LINKS) {
if (((rv = apr_stat(&rnew->finfo, rnew->filename,
APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE)) {
rnew->finfo.filetype = 0;
}
}
else {
if (((rv = apr_stat(&rnew->finfo, rnew->filename,
APR_FINFO_LINK | APR_FINFO_MIN,
rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE)) {
rnew->finfo.filetype = 0;
}
}
}
else {
memcpy(&rnew->finfo, dirent, sizeof(apr_finfo_t));
}
if (rnew->finfo.filetype == APR_LNK) {
/*
* Resolve this symlink. We should tie this back to dir_walk's cache
*/
if ((res = resolve_symlink(rnew->filename, &rnew->finfo,
ap_allow_options(rnew), rnew->pool))
!= OK) {
rnew->status = res;
return rnew;
}
}
if (rnew->finfo.filetype == APR_DIR) {
/* ap_make_full_path overallocated the buffers
* by one character to help us out here.
*/
strcat(rnew->filename, "/");
if (!rnew->path_info || !*rnew->path_info) {
strcat(rnew->uri, "/");
}
}
/* fill in parsed_uri values
*/
if (r->args && *r->args && (subtype == AP_SUBREQ_MERGE_ARGS)) {
ap_parse_uri(rnew, apr_pstrcat(r->pool, rnew->uri, "?",
r->args, NULL));
}
else {
ap_parse_uri(rnew, rnew->uri);
}
/* We cannot return NULL without violating the API. So just turn this
* subrequest into a 500. */
if (ap_is_recursion_limit_exceeded(r)) {
rnew->status = HTTP_INTERNAL_SERVER_ERROR;
return rnew;
}
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
return rnew;
}
AP_DECLARE(request_rec *) ap_sub_req_lookup_file(const char *new_file,
const request_rec *r,
ap_filter_t *next_filter)
{
request_rec *rnew;
int res;
char *fdir;
apr_size_t fdirlen;
rnew = make_sub_request(r, next_filter);
fdir = ap_make_dirstr_parent(rnew->pool, r->filename);
fdirlen = strlen(fdir);
/* Translate r->filename, if it was canonical, it stays canonical
*/
if (r->canonical_filename == r->filename) {
rnew->canonical_filename = (char*)(1);
}
if (apr_filepath_merge(&rnew->filename, fdir, new_file,
APR_FILEPATH_TRUENAME, rnew->pool) != APR_SUCCESS) {
rnew->status = HTTP_FORBIDDEN;
return rnew;
}
if (rnew->canonical_filename) {
rnew->canonical_filename = rnew->filename;
}
/*
* Check for a special case... if there are no '/' characters in new_file
* at all, and the path was the same, then we are looking at a relative
* lookup in the same directory. Fixup the URI to match.
*/
if (strncmp(rnew->filename, fdir, fdirlen) == 0
&& rnew->filename[fdirlen]
&& ap_strchr_c(rnew->filename + fdirlen, '/') == NULL) {
apr_status_t rv;
if (ap_allow_options(rnew) & OPT_SYM_LINKS) {
if (((rv = apr_stat(&rnew->finfo, rnew->filename,
APR_FINFO_MIN, rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE)) {
rnew->finfo.filetype = 0;
}
}
else {
if (((rv = apr_stat(&rnew->finfo, rnew->filename,
APR_FINFO_LINK | APR_FINFO_MIN,
rnew->pool)) != APR_SUCCESS)
&& (rv != APR_INCOMPLETE)) {
rnew->finfo.filetype = 0;
}
}
if (r->uri && *r->uri) {
char *udir = ap_make_dirstr_parent(rnew->pool, r->uri);
rnew->uri = ap_make_full_path(rnew->pool, udir,
rnew->filename + fdirlen);
ap_parse_uri(rnew, rnew->uri); /* fill in parsed_uri values */
}
else {
ap_parse_uri(rnew, new_file); /* fill in parsed_uri values */
rnew->uri = apr_pstrdup(rnew->pool, "");
}
}
else {
/* XXX: @@@: What should be done with the parsed_uri values?
* We would be better off stripping down to the 'common' elements
* of the path, then reassembling the URI as best as we can.
*/
ap_parse_uri(rnew, new_file); /* fill in parsed_uri values */
/*
* XXX: this should be set properly like it is in the same-dir case
* but it's actually sometimes to impossible to do it... because the
* file may not have a uri associated with it -djg
*/
rnew->uri = apr_pstrdup(rnew->pool, "");
}
/* We cannot return NULL without violating the API. So just turn this
* subrequest into a 500. */
if (ap_is_recursion_limit_exceeded(r)) {
rnew->status = HTTP_INTERNAL_SERVER_ERROR;
return rnew;
}
if ((res = ap_process_request_internal(rnew))) {
rnew->status = res;
}
return rnew;
}
AP_DECLARE(int) ap_run_sub_req(request_rec *r)
{
int retval = DECLINED;
/* Run the quick handler if the subrequest is not a dirent or file
* subrequest
*/
if (!(r->filename && r->finfo.filetype)) {
retval = ap_run_quick_handler(r, 0);
}
if (retval != OK) {
retval = ap_invoke_handler(r);
if (retval == DONE) {
retval = OK;
}
}
ap_finalize_sub_req_protocol(r);
return retval;
}
AP_DECLARE(void) ap_destroy_sub_req(request_rec *r)
{
/* Reclaim the space */
apr_pool_destroy(r->pool);
}
/*
* Function to set the r->mtime field to the specified value if it's later
* than what's already there.
*/
AP_DECLARE(void) ap_update_mtime(request_rec *r, apr_time_t dependency_mtime)
{
if (r->mtime < dependency_mtime) {
r->mtime = dependency_mtime;
}
}
/*
* Is it the initial main request, which we only get *once* per HTTP request?
*/
AP_DECLARE(int) ap_is_initial_req(request_rec *r)
{
return (r->main == NULL) /* otherwise, this is a sub-request */
&& (r->prev == NULL); /* otherwise, this is an internal redirect */
}