1
/* Licensed to the Apache Software Foundation (ASF) under one or more
2
* contributor license agreements. See the NOTICE file distributed with
3
* this work for additional information regarding copyright ownership.
4
* The ASF licenses this file to You under the Apache License, Version 2.0
5
* (the "License"); you may not use this file except in compliance with
6
* the License. You may obtain a copy of the License at
8
* http://www.apache.org/licenses/LICENSE-2.0
10
* Unless required by applicable law or agreed to in writing, software
11
* distributed under the License is distributed on an "AS IS" BASIS,
12
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13
* See the License for the specific language governing permissions and
14
* limitations under the License.
22
* Andrew Wilson <Andrew.Wilson@cm.cf.ac.uk> 25.Jan.96
25
* This version of mod_cern_meta.c controls Meta File behaviour on a
26
* per-directory basis. Previous versions of the module defined behaviour
27
* on a per-server basis. The upshot is that you'll need to revisit your
28
* configuration files in order to make use of the new module.
31
* Emulate the CERN HTTPD Meta file semantics. Meta files are HTTP
32
* headers that can be output in addition to the normal range of
33
* headers for each file accessed. They appear rather like the Apache
34
* .asis files, and are able to provide a crude way of influencing
35
* the Expires: header, as well as providing other curiosities.
36
* There are many ways to manage meta information, this one was
37
* chosen because there is already a large number of CERN users
38
* who can exploit this module. It should be noted that there are probably
39
* more sensitive ways of managing the Expires: header specifically.
41
* The module obeys the following directives, which can appear
42
* in the server's .conf files and in .htaccess files.
46
* turns on|off meta file processing for any directory.
47
* Default value is off
49
* # turn on MetaFiles in this directory
52
* MetaDir <directory name>
54
* specifies the name of the directory in which Apache can find
55
* meta information files. The directory is usually a 'hidden'
56
* subdirectory of the directory that contains the file being
59
* # .meta files are in the *same* directory as the
60
* # file being accessed
63
* the default is to look in a '.web' subdirectory. This is the
64
* same as for CERN 3.+ webservers and behaviour is the same as
69
* MetaSuffix <meta file suffix>
71
* specifies the file name suffix for the file containing the
72
* meta information. eg:
74
* # our meta files are suffixed with '.cern_meta'
75
* MetaSuffix .cern_meta
77
* the default is to look for files with the suffix '.meta'. This
78
* behaviour is the same as for the directive:
82
* When accessing the file
84
* DOCUMENT_ROOT/somedir/index.html
86
* this module will look for the file
88
* DOCUMENT_ROOT/somedir/.web/index.html.meta
90
* and will use its contents to generate additional MIME header
93
* For more information on the CERN Meta file semantics see:
95
* http://www.w3.org/hypertext/WWW/Daemon/User/Config/General.html#MetaDir
98
* 29.Jan.96 pfopen/pfclose instead of fopen/fclose
99
* DECLINE when real file not found, we may be checking each
100
* of the index.html/index.shtml/index.htm variants and don't
101
* need to report missing ones as spurious errors.
102
* 31.Jan.96 log_error reports about a malformed .meta file, rather
103
* than a script error.
104
* 20.Jun.96 MetaFiles <on|off> default off, added, so that module
105
* can be configured per-directory. Prior to this the module
106
* was running for each request anywhere on the server, naughty..
107
* 29.Jun.96 All directives made per-directory.
111
#include "apr_strings.h"
113
#define APR_WANT_STRFUNC
114
#include "apr_want.h"
116
#if APR_HAVE_SYS_TYPES_H
117
#include <sys/types.h>
120
#include "ap_config.h"
122
#include "http_config.h"
123
#include "util_script.h"
124
#include "http_log.h"
125
#include "http_request.h"
126
#include "http_protocol.h"
129
#define DIR_CMD_PERMS OR_INDEXES
131
#define DEFAULT_METADIR ".web"
132
#define DEFAULT_METASUFFIX ".meta"
133
#define DEFAULT_METAFILES 0
135
module AP_MODULE_DECLARE_DATA cern_meta_module;
139
const char *metasuffix;
141
} cern_meta_dir_config;
143
static void *create_cern_meta_dir_config(apr_pool_t *p, char *dummy)
145
cern_meta_dir_config *new =
146
(cern_meta_dir_config *) apr_palloc(p, sizeof(cern_meta_dir_config));
149
new->metasuffix = NULL;
150
new->metafiles = DEFAULT_METAFILES;
155
static void *merge_cern_meta_dir_configs(apr_pool_t *p, void *basev, void *addv)
157
cern_meta_dir_config *base = (cern_meta_dir_config *) basev;
158
cern_meta_dir_config *add = (cern_meta_dir_config *) addv;
159
cern_meta_dir_config *new =
160
(cern_meta_dir_config *) apr_palloc(p, sizeof(cern_meta_dir_config));
162
new->metadir = add->metadir ? add->metadir : base->metadir;
163
new->metasuffix = add->metasuffix ? add->metasuffix : base->metasuffix;
164
new->metafiles = add->metafiles;
169
static const char *set_metadir(cmd_parms *parms, void *in_dconf, const char *arg)
171
cern_meta_dir_config *dconf = in_dconf;
173
dconf->metadir = arg;
177
static const char *set_metasuffix(cmd_parms *parms, void *in_dconf, const char *arg)
179
cern_meta_dir_config *dconf = in_dconf;
181
dconf->metasuffix = arg;
185
static const char *set_metafiles(cmd_parms *parms, void *in_dconf, int arg)
187
cern_meta_dir_config *dconf = in_dconf;
189
dconf->metafiles = arg;
194
static const command_rec cern_meta_cmds[] =
196
AP_INIT_FLAG("MetaFiles", set_metafiles, NULL, DIR_CMD_PERMS,
197
"Limited to 'on' or 'off'"),
198
AP_INIT_TAKE1("MetaDir", set_metadir, NULL, DIR_CMD_PERMS,
199
"the name of the directory containing meta files"),
200
AP_INIT_TAKE1("MetaSuffix", set_metasuffix, NULL, DIR_CMD_PERMS,
201
"the filename suffix for meta files"),
205
/* XXX: this is very similar to ap_scan_script_header_err_core...
206
* are the differences deliberate, or just a result of bit rot?
208
static int scan_meta_file(request_rec *r, apr_file_t *f)
210
char w[MAX_STRING_LEN];
213
apr_table_t *tmp_headers;
215
tmp_headers = apr_table_make(r->pool, 5);
216
while (apr_file_gets(w, MAX_STRING_LEN - 1, f) == APR_SUCCESS) {
218
/* Delete terminal (CR?)LF */
220
if (p > 0 && w[p - 1] == '\n') {
221
if (p > 1 && w[p - 2] == '\015')
231
/* if we see a bogus header don't ignore it. Shout and scream */
233
if (!(l = strchr(w, ':'))) {
234
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
235
"malformed header in meta file: %s", r->filename);
236
return HTTP_INTERNAL_SERVER_ERROR;
240
while (*l && apr_isspace(*l))
243
if (!strcasecmp(w, "Content-type")) {
245
/* Nuke trailing whitespace */
247
char *endp = l + strlen(l) - 1;
248
while (endp > l && apr_isspace(*endp))
251
tmp = apr_pstrdup(r->pool, l);
252
ap_content_type_tolower(tmp);
253
ap_set_content_type(r, tmp);
255
else if (!strcasecmp(w, "Status")) {
256
sscanf(l, "%d", &r->status);
257
r->status_line = apr_pstrdup(r->pool, l);
260
apr_table_set(tmp_headers, w, l);
263
apr_table_overlap(r->headers_out, tmp_headers, APR_OVERLAP_TABLES_SET);
267
static int add_cern_meta_data(request_rec *r)
274
apr_file_t *f = NULL;
275
apr_status_t retcode;
276
cern_meta_dir_config *dconf;
280
dconf = ap_get_module_config(r->per_dir_config, &cern_meta_module);
282
if (!dconf->metafiles) {
286
/* if ./.web/$1.meta exists then output 'asis' */
288
if (r->finfo.filetype == 0) {
292
/* is this a directory? */
293
if (r->finfo.filetype == APR_DIR || r->uri[strlen(r->uri) - 1] == '/') {
297
/* what directory is this file in? */
298
scrap_book = apr_pstrdup(r->pool, r->filename);
300
leading_slash = strchr(scrap_book, '/');
301
last_slash = strrchr(scrap_book, '/');
302
if ((last_slash != NULL) && (last_slash != leading_slash)) {
303
/* skip over last slash */
304
real_file = last_slash;
309
/* no last slash, buh?! */
310
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
311
"internal error in mod_cern_meta: %s", r->filename);
312
/* should really barf, but hey, let's be friends... */
316
metafilename = apr_pstrcat(r->pool, scrap_book, "/",
317
dconf->metadir ? dconf->metadir : DEFAULT_METADIR,
319
dconf->metasuffix ? dconf->metasuffix : DEFAULT_METASUFFIX,
322
/* It sucks to require this subrequest to complete, because this
323
* means people must leave their meta files accessible to the world.
324
* A better solution might be a "safe open" feature of pfopen to avoid
325
* pipes, symlinks, and crap like that.
327
* In fact, this doesn't suck. Because <Location > blocks are never run
328
* against sub_req_lookup_file, the meta can be somewhat protected by
329
* either masking it with a <Location > directive or alias, or stowing
330
* the file outside of the web document tree, while providing the
331
* appropriate directory blocks to allow access to it as a file.
333
rr = ap_sub_req_lookup_file(metafilename, r, NULL);
334
if (rr->status != HTTP_OK) {
335
ap_destroy_sub_req(rr);
338
ap_destroy_sub_req(rr);
340
retcode = apr_file_open(&f, metafilename, APR_READ, APR_OS_DEFAULT, r->pool);
341
if (retcode != APR_SUCCESS) {
342
if (APR_STATUS_IS_ENOENT(retcode)) {
345
ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
346
"meta file permissions deny server access: %s", metafilename);
347
return HTTP_FORBIDDEN;
350
/* read the headers in */
351
rv = scan_meta_file(r, f);
357
static void register_hooks(apr_pool_t *p)
359
ap_hook_fixups(add_cern_meta_data,NULL,NULL,APR_HOOK_MIDDLE);
362
module AP_MODULE_DECLARE_DATA cern_meta_module =
364
STANDARD20_MODULE_STUFF,
365
create_cern_meta_dir_config, /* dir config creater */
366
merge_cern_meta_dir_configs, /* dir merger --- default is to override */
367
NULL, /* server config */
368
NULL, /* merge server configs */
369
cern_meta_cmds, /* command apr_table_t */
370
register_hooks /* register hooks */