Adding upstream version 2.4.56.upstream/2.4.56

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 371 insertions, 0 deletions

diff --git a/modules/metadata/mod_cern_meta.c b/modules/metadata/mod_cern_meta.c
new file mode 100644
index 0000000..3f36b2d
--- /dev/null
+++ b/modules/metadata/mod_cern_meta.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.
+ */
+
+/*
+ * mod_cern_meta.c
+ * version 0.1.0
+ * status beta
+ *
+ * Andrew Wilson <Andrew.Wilson@cm.cf.ac.uk> 25.Jan.96
+ *
+ * *** IMPORTANT ***
+ * This version of mod_cern_meta.c controls Meta File behaviour on a
+ * per-directory basis.  Previous versions of the module defined behaviour
+ * on a per-server basis.  The upshot is that you'll need to revisit your
+ * configuration files in order to make use of the new module.
+ * ***
+ *
+ * Emulate the CERN HTTPD Meta file semantics.  Meta files are HTTP
+ * headers that can be output in addition to the normal range of
+ * headers for each file accessed.  They appear rather like the Apache
+ * .asis files, and are able to provide a crude way of influencing
+ * the Expires: header, as well as providing other curiosities.
+ * There are many ways to manage meta information, this one was
+ * chosen because there is already a large number of CERN users
+ * who can exploit this module.  It should be noted that there are probably
+ * more sensitive ways of managing the Expires: header specifically.
+ *
+ * The module obeys the following directives, which can appear
+ * in the server's .conf files and in .htaccess files.
+ *
+ *  MetaFiles <on|off>
+ *
+ *    turns on|off meta file processing for any directory.
+ *    Default value is off
+ *
+ *        # turn on MetaFiles in this directory
+ *        MetaFiles on
+ *
+ *  MetaDir <directory name>
+ *
+ *    specifies the name of the directory in which Apache can find
+ *    meta information files.  The directory is usually a 'hidden'
+ *    subdirectory of the directory that contains the file being
+ *    accessed.  eg:
+ *
+ *        # .meta files are in the *same* directory as the
+ *        # file being accessed
+ *        MetaDir .
+ *
+ *    the default is to look in a '.web' subdirectory. This is the
+ *    same as for CERN 3.+ webservers and behaviour is the same as
+ *    for the directive:
+ *
+ *        MetaDir .web
+ *
+ *  MetaSuffix <meta file suffix>
+ *
+ *    specifies the file name suffix for the file containing the
+ *    meta information.  eg:
+ *
+ *       # our meta files are suffixed with '.cern_meta'
+ *       MetaSuffix .cern_meta
+ *
+ *    the default is to look for files with the suffix '.meta'.  This
+ *    behaviour is the same as for the directive:
+ *
+ *       MetaSuffix .meta
+ *
+ * When accessing the file
+ *
+ *   DOCUMENT_ROOT/somedir/index.html
+ *
+ * this module will look for the file
+ *
+ *   DOCUMENT_ROOT/somedir/.web/index.html.meta
+ *
+ * and will use its contents to generate additional MIME header
+ * information.
+ *
+ * For more information on the CERN Meta file semantics see:
+ *
+ *   http://www.w3.org/hypertext/WWW/Daemon/User/Config/General.html#MetaDir
+ *
+ * Change-log:
+ * 29.Jan.96 pfopen/pfclose instead of fopen/fclose
+ *           DECLINE when real file not found, we may be checking each
+ *           of the index.html/index.shtml/index.htm variants and don't
+ *           need to report missing ones as spurious errors.
+ * 31.Jan.96 log_error reports about a malformed .meta file, rather
+ *           than a script error.
+ * 20.Jun.96 MetaFiles <on|off> default off, added, so that module
+ *           can be configured per-directory.  Prior to this the module
+ *           was running for each request anywhere on the server, naughty..
+ * 29.Jun.96 All directives made per-directory.
+ */
+
+#include "apr.h"
+#include "apr_strings.h"
+
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "util_script.h"
+#include "http_log.h"
+#include "http_request.h"
+#include "http_protocol.h"
+#include "apr_lib.h"
+
+#define DIR_CMD_PERMS OR_INDEXES
+
+#define DEFAULT_METADIR     ".web"
+#define DEFAULT_METASUFFIX  ".meta"
+#define DEFAULT_METAFILES   0
+
+module AP_MODULE_DECLARE_DATA cern_meta_module;
+
+typedef struct {
+    const char *metadir;
+    const char *metasuffix;
+    int metafiles;
+} cern_meta_dir_config;
+
+static void *create_cern_meta_dir_config(apr_pool_t *p, char *dummy)
+{
+    cern_meta_dir_config *new =
+    (cern_meta_dir_config *) apr_palloc(p, sizeof(cern_meta_dir_config));
+
+    new->metadir = NULL;
+    new->metasuffix = NULL;
+    new->metafiles = DEFAULT_METAFILES;
+
+    return new;
+}
+
+static void *merge_cern_meta_dir_configs(apr_pool_t *p, void *basev, void *addv)
+{
+    cern_meta_dir_config *base = (cern_meta_dir_config *) basev;
+    cern_meta_dir_config *add = (cern_meta_dir_config *) addv;
+    cern_meta_dir_config *new =
+    (cern_meta_dir_config *) apr_palloc(p, sizeof(cern_meta_dir_config));
+
+    new->metadir = add->metadir ? add->metadir : base->metadir;
+    new->metasuffix = add->metasuffix ? add->metasuffix : base->metasuffix;
+    new->metafiles = add->metafiles;
+
+    return new;
+}
+
+static const char *set_metadir(cmd_parms *parms, void *in_dconf, const char *arg)
+{
+    cern_meta_dir_config *dconf = in_dconf;
+
+    dconf->metadir = arg;
+    return NULL;
+}
+
+static const char *set_metasuffix(cmd_parms *parms, void *in_dconf, const char *arg)
+{
+    cern_meta_dir_config *dconf = in_dconf;
+
+    dconf->metasuffix = arg;
+    return NULL;
+}
+
+static const char *set_metafiles(cmd_parms *parms, void *in_dconf, int arg)
+{
+    cern_meta_dir_config *dconf = in_dconf;
+
+    dconf->metafiles = arg;
+    return NULL;
+}
+
+
+static const command_rec cern_meta_cmds[] =
+{
+    AP_INIT_FLAG("MetaFiles", set_metafiles, NULL, DIR_CMD_PERMS,
+                 "Limited to 'on' or 'off'"),
+    AP_INIT_TAKE1("MetaDir", set_metadir, NULL, DIR_CMD_PERMS,
+                  "the name of the directory containing meta files"),
+    AP_INIT_TAKE1("MetaSuffix", set_metasuffix, NULL, DIR_CMD_PERMS,
+                  "the filename suffix for meta files"),
+    {NULL}
+};
+
+/* XXX: this is very similar to ap_scan_script_header_err_core...
+ * are the differences deliberate, or just a result of bit rot?
+ */
+static int scan_meta_file(request_rec *r, apr_file_t *f)
+{
+    char w[MAX_STRING_LEN];
+    char *l;
+    int p;
+    apr_table_t *tmp_headers;
+
+    tmp_headers = apr_table_make(r->pool, 5);
+    while (apr_file_gets(w, MAX_STRING_LEN - 1, f) == APR_SUCCESS) {
+
+    /* Delete terminal (CR?)LF */
+        p = strlen(w);
+        if (p > 0 && w[p - 1] == '\n') {
+            if (p > 1 && w[p - 2] == '\015')
+                w[p - 2] = '\0';
+            else
+                w[p - 1] = '\0';
+        }
+
+        if (w[0] == '\0') {
+            return OK;
+        }
+
+        /* if we see a bogus header don't ignore it. Shout and scream */
+
+        if (!(l = strchr(w, ':'))) {
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01560)
+                "malformed header in meta file: %s", r->filename);
+            return HTTP_INTERNAL_SERVER_ERROR;
+        }
+
+        *l++ = '\0';
+        while (apr_isspace(*l))
+            ++l;
+
+        if (!ap_cstr_casecmp(w, "Content-type")) {
+            char *tmp;
+            /* Nuke trailing whitespace */
+
+            char *endp = l + strlen(l) - 1;
+            while (endp > l && apr_isspace(*endp))
+                *endp-- = '\0';
+
+            tmp = apr_pstrdup(r->pool, l);
+            ap_content_type_tolower(tmp);
+            ap_set_content_type(r, tmp);
+        }
+        else if (!ap_cstr_casecmp(w, "Status")) {
+            sscanf(l, "%d", &r->status);
+            r->status_line = apr_pstrdup(r->pool, l);
+        }
+        else {
+            apr_table_set(tmp_headers, w, l);
+        }
+    }
+    apr_table_overlap(r->headers_out, tmp_headers, APR_OVERLAP_TABLES_SET);
+    return OK;
+}
+
+static int add_cern_meta_data(request_rec *r)
+{
+    char *metafilename;
+    char *leading_slash;
+    char *last_slash;
+    char *real_file;
+    char *scrap_book;
+    apr_file_t *f = NULL;
+    apr_status_t retcode;
+    cern_meta_dir_config *dconf;
+    int rv;
+    request_rec *rr;
+
+    dconf = ap_get_module_config(r->per_dir_config, &cern_meta_module);
+
+    if (!dconf->metafiles) {
+        return DECLINED;
+    }
+
+    /* if ./.web/$1.meta exists then output 'asis' */
+
+    if (r->finfo.filetype == APR_NOFILE) {
+        return DECLINED;
+    }
+
+    /* is this a directory? */
+    if (r->finfo.filetype == APR_DIR || r->uri[strlen(r->uri) - 1] == '/') {
+        return DECLINED;
+    }
+
+    /* what directory is this file in? */
+    scrap_book = apr_pstrdup(r->pool, r->filename);
+
+    leading_slash = strchr(scrap_book, '/');
+    last_slash = strrchr(scrap_book, '/');
+    if ((last_slash != NULL) && (last_slash != leading_slash)) {
+        /* skip over last slash */
+        real_file = last_slash;
+        real_file++;
+        *last_slash = '\0';
+    }
+    else {
+        /* no last slash, buh?! */
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01561)
+            "internal error in mod_cern_meta: %s", r->filename);
+        /* should really barf, but hey, let's be friends... */
+        return DECLINED;
+    }
+
+    metafilename = apr_pstrcat(r->pool, scrap_book, "/",
+               dconf->metadir ? dconf->metadir : DEFAULT_METADIR,
+               "/", real_file,
+         dconf->metasuffix ? dconf->metasuffix : DEFAULT_METASUFFIX,
+               NULL);
+
+    /* It sucks to require this subrequest to complete, because this
+     * means people must leave their meta files accessible to the world.
+     * A better solution might be a "safe open" feature of pfopen to avoid
+     * pipes, symlinks, and crap like that.
+     *
+     * In fact, this doesn't suck.  Because <Location > blocks are never run
+     * against sub_req_lookup_file, the meta can be somewhat protected by
+     * either masking it with a <Location > directive or alias, or stowing
+     * the file outside of the web document tree, while providing the
+     * appropriate directory blocks to allow access to it as a file.
+     */
+    rr = ap_sub_req_lookup_file(metafilename, r, NULL);
+    if (rr->status != HTTP_OK) {
+        ap_destroy_sub_req(rr);
+        return DECLINED;
+    }
+    ap_destroy_sub_req(rr);
+
+    retcode = apr_file_open(&f, metafilename, APR_READ, APR_OS_DEFAULT, r->pool);
+    if (retcode != APR_SUCCESS) {
+        if (APR_STATUS_IS_ENOENT(retcode)) {
+            return DECLINED;
+        }
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(01562)
+            "meta file permissions deny server access: %s", metafilename);
+        return HTTP_FORBIDDEN;
+    }
+
+    /* read the headers in */
+    rv = scan_meta_file(r, f);
+    apr_file_close(f);
+
+    return rv;
+}
+
+static void register_hooks(apr_pool_t *p)
+{
+    ap_hook_fixups(add_cern_meta_data,NULL,NULL,APR_HOOK_MIDDLE);
+}
+
+AP_DECLARE_MODULE(cern_meta) =
+{
+    STANDARD20_MODULE_STUFF,
+    create_cern_meta_dir_config, /* dir config creater */
+    merge_cern_meta_dir_configs, /* dir merger --- default is to override */
+    NULL,                        /* server config */
+    NULL,                        /* merge server configs */
+    cern_meta_cmds,              /* command apr_table_t */
+    register_hooks               /* register hooks */
+};