1 files changed, 417 insertions, 0 deletions

diff --git a/modules/mappers/mod_dir.c b/modules/mappers/mod_dir.c
new file mode 100644
index 0000000..3e30198
--- /dev/null
+++ b/modules/mappers/mod_dir.c
@@ -0,0 +1,417 @@
+/* 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;
+    }
+
+    /* 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->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;
+    }
+
+    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_setn(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 */
+};