Merging upstream version 2.4.59.

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

9 files changed, 872 insertions, 230 deletions

diff --git a/modules/dav/fs/dbm.c b/modules/dav/fs/dbm.c
index 821168e..347d75d 100644
--- a/modules/dav/fs/dbm.c
+++ b/modules/dav/fs/dbm.c
@@ -37,6 +37,11 @@
 #define APR_WANT_BYTEFUNC
 #include "apr_want.h"       /* for ntohs and htons */
 
+#include "apr_version.h"
+#if !APR_VERSION_AT_LEAST(2,0,0)
+#include "apu_version.h"
+#endif
+
 #include "mod_dav.h"
 #include "repos.h"
 #include "http_log.h"
@@ -127,11 +132,30 @@ void dav_fs_ensure_state_dir(apr_pool_t * p, const char *dirname)
 dav_error * dav_dbm_open_direct(apr_pool_t *p, const char *pathname, int ro,
                                 dav_db **pdb)
 {
-    apr_status_t status;
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+    const apr_dbm_driver_t *driver;
+    const apu_err_t *err;
+#endif
     apr_dbm_t *file = NULL;
+    apr_status_t status;
 
     *pdb = NULL;
 
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+    if ((status = apr_dbm_get_driver(&driver, NULL, &err, p)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(10289)
+                     "mod_dav_fs: The DBM library '%s' could not be loaded: %s",
+                             err->reason, err->msg);
+        return dav_new_error(p, HTTP_INTERNAL_SERVER_ERROR, 1, status,
+                "Could not load library for property database.");
+    }
+    if ((status = apr_dbm_open2(&file, driver, pathname,
+                               ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
+                               APR_OS_DEFAULT, p))
+                               != APR_SUCCESS && !ro) {
+        return dav_fs_dbm_error(NULL, p, status);
+    }
+#else
     if ((status = apr_dbm_open(&file, pathname,
                                ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
                                APR_OS_DEFAULT, p))
@@ -143,6 +167,7 @@ dav_error * dav_dbm_open_direct(apr_pool_t *p, const char *pathname, int ro,
            and we need to write */
         return dav_fs_dbm_error(NULL, p, status);
     }
+#endif
 
     /* may be NULL if we tried to open a non-existent db as read-only */
     if (file != NULL) {
@@ -355,29 +380,33 @@ static void dav_append_prop(apr_pool_t *pool,
         /* the property is an empty value */
         if (*name == ':') {
             /* "no namespace" case */
-            s = apr_psprintf(pool, "<%s/>" DEBUG_CR, name+1);
+            s = apr_pstrcat(pool, "<", name+1, "/>" DEBUG_CR, NULL);
         }
         else {
-            s = apr_psprintf(pool, "<ns%s/>" DEBUG_CR, name);
+            s = apr_pstrcat(pool, "<ns", name, "/>" DEBUG_CR, NULL);
         }
     }
     else if (*lang != '\0') {
         if (*name == ':') {
             /* "no namespace" case */
-            s = apr_psprintf(pool, "<%s xml:lang=\"%s\">%s</%s>" DEBUG_CR,
-                             name+1, lang, value, name+1);
+            s = apr_pstrcat(pool, "<", name+1, " xml:lang=\"",
+                            lang, "\">", value, "</", name+1, ">" DEBUG_CR,
+                            NULL);
         }
         else {
-            s = apr_psprintf(pool, "<ns%s xml:lang=\"%s\">%s</ns%s>" DEBUG_CR,
-                             name, lang, value, name);
+            s = apr_pstrcat(pool, "<ns", name, " xml:lang=\"",
+                            lang, "\">", value, "</ns", name, ">" DEBUG_CR,
+                            NULL);
         }
     }
     else if (*name == ':') {
         /* "no namespace" case */
-        s = apr_psprintf(pool, "<%s>%s</%s>" DEBUG_CR, name+1, value, name+1);
+        s = apr_pstrcat(pool, "<", name+1, ">", value, "</", name+1, ">"
+                        DEBUG_CR, NULL);
     }
     else {
-        s = apr_psprintf(pool, "<ns%s>%s</ns%s>" DEBUG_CR, name, value, name);
+        s = apr_pstrcat(pool, "<ns", name, ">", value, "</ns", name, ">"
+                        DEBUG_CR, NULL);
     }
 
     apr_text_append(pool, phdr, s);
diff --git a/modules/dav/fs/lock.c b/modules/dav/fs/lock.c
index c058e2e..ef18c4a 100644
--- a/modules/dav/fs/lock.c
+++ b/modules/dav/fs/lock.c
@@ -953,7 +953,7 @@ static dav_error * dav_fs_add_locknull_state(
 
 /*
 ** dav_fs_remove_locknull_state:  Given a request, check to see if r->filename
-**    is/was a lock-null resource.  If so, return it to an existant state, i.e.
+**    is/was a lock-null resource.  If so, return it to an existent state, i.e.
 **    remove it from the list in the appropriate .DAV/locknull file.
 */
 static dav_error * dav_fs_remove_locknull_state(
diff --git a/modules/dav/fs/repos.c b/modules/dav/fs/repos.c
index 6a5ff76..64bc894 100644
--- a/modules/dav/fs/repos.c
+++ b/modules/dav/fs/repos.c
@@ -35,6 +35,7 @@
 #include "mod_dav.h"
 #include "repos.h"
 
+APLOG_USE_MODULE(dav_fs);
 
 /* to assist in debugging mod_dav's GET handling */
 #define DEBUG_GET_HANDLER       0
@@ -948,15 +949,29 @@ static dav_error * dav_fs_open_stream(const dav_resource *resource,
         else if (APR_STATUS_IS_EEXIST(rv)) {
             rv = apr_file_open(&ds->f, ds->pathname, flags, APR_OS_DEFAULT,
                                ds->p);
+            if (rv != APR_SUCCESS) {
+                return dav_new_error(p, MAP_IO2HTTP(rv), 0, rv,
+                                    apr_psprintf(p, "Could not open an existing "
+                                                 "resource for writing: %s.",
+                                                 ds->pathname));
+            }
         }
     }
     else {
         rv = apr_file_open(&ds->f, ds->pathname, flags, APR_OS_DEFAULT, ds->p);
+        if (rv != APR_SUCCESS) {
+            return dav_new_error(p, MAP_IO2HTTP(rv), 0, rv,
+                                 apr_psprintf(p, "Could not open an existing "
+                                              "resource for reading: %s.",
+                                              ds->pathname));
+        }
     }
 
     if (rv != APR_SUCCESS) {
         return dav_new_error(p, MAP_IO2HTTP(rv), 0, rv,
-                             "An error occurred while opening a resource.");
+                             apr_psprintf(p, "An error occurred while opening "
+                                          "a resource for writing: %s.",
+                                          ds->pathname));
     }
 
     /* (APR registers cleanups for the fd with the pool) */
@@ -1572,6 +1587,19 @@ static dav_error * dav_fs_walker(dav_fs_walker_context *fsctx, int depth)
         status = apr_stat(&fsctx->info1.finfo, fsctx->path1.buf,
                           DAV_FINFO_MASK, pool);
         if (status != APR_SUCCESS && status != APR_INCOMPLETE) {
+            dav_resource_private *ctx = params->root->info;
+
+            ap_log_rerror(APLOG_MARK, APLOG_ERR, status, ctx->r,
+                          APLOGNO(10472) "could not access file (%s) during directory walk",
+                          fsctx->path1.buf);
+
+            /* If being tolerant, ignore failure due to losing a race
+             * with some other process deleting files out from under
+             * the directory walk. */
+            if ((params->walk_type & DAV_WALKTYPE_TOLERANT)
+                && APR_STATUS_IS_ENOENT(status)) {
+                continue;
+            }
             /* woah! where'd it go? */
             /* ### should have a better error here */
             err = dav_new_error(pool, HTTP_NOT_FOUND, 0, status, NULL);
@@ -1663,7 +1691,7 @@ static dav_error * dav_fs_walker(dav_fs_walker_context *fsctx, int depth)
         /* put a slash back on the end of the directory */
         fsctx->path1.buf[fsctx->path1.cur_len - 1] = '/';
 
-        /* these are all non-existant (files) */
+        /* these are all non-existent (files) */
         fsctx->res1.exists = 0;
         fsctx->res1.collection = 0;
         memset(&fsctx->info1.finfo, 0, sizeof(fsctx->info1.finfo));
@@ -1853,27 +1881,26 @@ static dav_error * dav_fs_walk(const dav_walk_params *params, int depth,
     return dav_fs_internal_walk(params, depth, 0, NULL, response);
 }
 
-/* dav_fs_etag:  Stolen from ap_make_etag.  Creates a strong etag
- *    for file path.
- * ### do we need to return weak tags sometimes?
+/* dav_fs_etag: Creates an etag for the file path.
  */
 static const char *dav_fs_getetag(const dav_resource *resource)
 {
-    dav_resource_private *ctx = resource->info;
-    /* XXX: This should really honor the FileETag setting */
+    etag_rec er;
 
-    if (!resource->exists)
-        return apr_pstrdup(ctx->pool, "");
+    dav_resource_private *ctx = resource->info;
 
-    if (ctx->finfo.filetype != APR_NOFILE) {
-        return apr_psprintf(ctx->pool, "\"%" APR_UINT64_T_HEX_FMT "-%"
-                            APR_UINT64_T_HEX_FMT "\"",
-                            (apr_uint64_t) ctx->finfo.size,
-                            (apr_uint64_t) ctx->finfo.mtime);
+    if (!resource->exists || !ctx->r) {
+        return "";
     }
 
-    return apr_psprintf(ctx->pool, "\"%" APR_UINT64_T_HEX_FMT "\"",
-                       (apr_uint64_t) ctx->finfo.mtime);
+    er.vlist_validator = NULL;
+    er.request_time = ctx->r->request_time;
+    er.finfo = &ctx->finfo;
+    er.pathname = ctx->pathname;
+    er.fd = NULL;
+    er.force_weak = 0;
+
+    return ap_make_etag_ex(ctx->r, &er);
 }
 
 static const dav_hooks_repository dav_hooks_repository_fs =
@@ -1913,7 +1940,7 @@ static dav_prop_insert dav_fs_insert_prop(const dav_resource *resource,
     const char *s;
     apr_pool_t *p = resource->info->pool;
     const dav_liveprop_spec *info;
-    int global_ns;
+    long global_ns;
 
     /* an HTTP-date can be 29 chars plus a null term */
     /* a 64-bit size can be 20 chars plus a null term */
@@ -1994,18 +2021,20 @@ static dav_prop_insert dav_fs_insert_prop(const dav_resource *resource,
     /* DBG3("FS: inserting lp%d:%s  (local %d)", ns, scan->name, scan->ns); */
 
     if (what == DAV_PROP_INSERT_VALUE) {
-        s = apr_psprintf(p, "<lp%d:%s>%s</lp%d:%s>" DEBUG_CR,
+        s = apr_psprintf(p, "<lp%ld:%s>%s</lp%ld:%s>" DEBUG_CR,
                          global_ns, info->name, value, global_ns, info->name);
     }
     else if (what == DAV_PROP_INSERT_NAME) {
-        s = apr_psprintf(p, "<lp%d:%s/>" DEBUG_CR, global_ns, info->name);
+        s = apr_psprintf(p, "<lp%ld:%s/>" DEBUG_CR, global_ns, info->name);
     }
     else {
         /* assert: what == DAV_PROP_INSERT_SUPPORTED */
-        s = apr_psprintf(p,
-                         "<D:supported-live-property D:name=\"%s\" "
-                         "D:namespace=\"%s\"/>" DEBUG_CR,
-                         info->name, dav_fs_namespace_uris[info->ns]);
+        s = apr_pstrcat(p,
+                        "<D:supported-live-property D:name=\"",
+                        info->name,
+                        "\" D:namespace=\"",
+                        dav_fs_namespace_uris[info->ns],
+                        "\"/>" DEBUG_CR, NULL);
     }
     apr_text_append(p, phdr, s);
 
diff --git a/modules/dav/lock/locks.c b/modules/dav/lock/locks.c
index 17b9ee6..0f072ec 100644
--- a/modules/dav/lock/locks.c
+++ b/modules/dav/lock/locks.c
@@ -26,8 +26,14 @@
 #define APR_WANT_MEMFUNC
 #include "apr_want.h"
 
+#include "apr_version.h"
+#if !APR_VERSION_AT_LEAST(2,0,0)
+#include "apu_version.h"
+#endif
+
 #include "httpd.h"
 #include "http_log.h"
+#include "http_main.h"      /* for ap_server_conf */
 
 #include "mod_dav.h"
 
@@ -311,16 +317,36 @@ static int dav_generic_compare_locktoken(const dav_locktoken *lt1,
  */
 static dav_error * dav_generic_really_open_lockdb(dav_lockdb *lockdb)
 {
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+    const apr_dbm_driver_t *driver;
+    const apu_err_t *er;
+#endif
     dav_error *err;
-    apr_status_t status;
+    apr_status_t status = APR_SUCCESS;
 
     if (lockdb->info->opened) {
         return NULL;
     }
 
+#if APU_MAJOR_VERSION > 1 || (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 7)
+    status = apr_dbm_get_driver(&driver, NULL, &er, lockdb->info->pool);
+
+    if (status) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, status, ap_server_conf, APLOGNO(10288)
+                     "mod_dav_lock: The DBM library '%s' could not be loaded: %s",
+                             er->reason, er->msg);
+        return dav_new_error(lockdb->info->pool, HTTP_INTERNAL_SERVER_ERROR, 1,
+                status, "Could not load library for property database.");
+    }
+
+    status = apr_dbm_open2(&lockdb->info->db, driver, lockdb->info->lockdb_path,
+                          lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
+                          APR_OS_DEFAULT, lockdb->info->pool);
+#else
     status = apr_dbm_open(&lockdb->info->db, lockdb->info->lockdb_path,
                           lockdb->ro ? APR_DBM_READONLY : APR_DBM_RWCREATE,
                           APR_OS_DEFAULT, lockdb->info->pool);
+#endif
 
     if (status) {
         err = dav_generic_dbm_new_error(lockdb->info->db, lockdb->info->pool,
diff --git a/modules/dav/main/mod_dav.c b/modules/dav/main/mod_dav.c
index 84012f2..dea3f18 100644
--- a/modules/dav/main/mod_dav.c
+++ b/modules/dav/main/mod_dav.c
@@ -81,8 +81,10 @@ typedef struct {
     const char *provider_name;
     const dav_provider *provider;
     const char *dir;
+    const char *base;
     int locktimeout;
     int allow_depthinfinity;
+    int allow_lockdiscovery;
 
 } dav_dir_conf;
 
@@ -195,8 +197,11 @@ static void *dav_merge_dir_config(apr_pool_t *p, void *base, void *overrides)
 
     newconf->locktimeout = DAV_INHERIT_VALUE(parent, child, locktimeout);
     newconf->dir = DAV_INHERIT_VALUE(parent, child, dir);
+    newconf->base = DAV_INHERIT_VALUE(parent, child, base);
     newconf->allow_depthinfinity = DAV_INHERIT_VALUE(parent, child,
                                                      allow_depthinfinity);
+    newconf->allow_lockdiscovery = DAV_INHERIT_VALUE(parent, child,
+                                                     allow_lockdiscovery);
 
     return newconf;
 }
@@ -207,7 +212,7 @@ DAV_DECLARE(const char *) dav_get_provider_name(request_rec *r)
     return conf ? conf->provider_name : NULL;
 }
 
-static const dav_provider *dav_get_provider(request_rec *r)
+DAV_DECLARE(const dav_provider *) dav_get_provider(request_rec *r)
 {
     dav_dir_conf *conf;
 
@@ -280,6 +285,18 @@ static const char *dav_cmd_dav(cmd_parms *cmd, void *config, const char *arg1)
 }
 
 /*
+ * Command handler for the DAVBasePath directive, which is TAKE1
+ */
+static const char *dav_cmd_davbasepath(cmd_parms *cmd, void *config, const char *arg1)
+{
+    dav_dir_conf *conf = config;
+
+    conf->base = arg1;
+
+    return NULL;
+}
+
+/*
  * Command handler for the DAVDepthInfinity directive, which is FLAG.
  */
 static const char *dav_cmd_davdepthinfinity(cmd_parms *cmd, void *config,
@@ -295,6 +312,21 @@ static const char *dav_cmd_davdepthinfinity(cmd_parms *cmd, void *config,
 }
 
 /*
+ * Command handler for the DAVLockDiscovery directive, which is FLAG.
+ */
+static const char *dav_cmd_davlockdiscovery(cmd_parms *cmd, void *config,
+                                            int arg)
+{
+    dav_dir_conf *conf = (dav_dir_conf *)config;
+
+    if (arg)
+        conf->allow_lockdiscovery = DAV_ENABLED_ON;
+    else
+        conf->allow_lockdiscovery = DAV_ENABLED_OFF;
+    return NULL;
+}
+
+/*
  * Command handler for DAVMinTimeout directive, which is TAKE1
  */
 static const char *dav_cmd_davmintimeout(cmd_parms *cmd, void *config,
@@ -436,7 +468,7 @@ static const char *dav_xml_escape_uri(apr_pool_t *p, const char *uri)
 }
 
 
-/* Write a complete RESPONSE object out as a <DAV:repsonse> xml
+/* Write a complete RESPONSE object out as a <DAV:response> xml
    element.  Data is sent into brigade BB, which is auto-flushed into
    the output filter stack for request R.  Use POOL for any temporary
    allocations.
@@ -557,6 +589,7 @@ DAV_DECLARE(void) dav_send_multistatus(request_rec *r, int status,
     dav_begin_multistatus(bb, r, status, namespaces);
 
     apr_pool_create(&subpool, r->pool);
+    apr_pool_tag(subpool, "mod_dav-multistatus");
 
     for (; first != NULL; first = first->next) {
       apr_pool_clear(subpool);
@@ -662,8 +695,8 @@ static int dav_created(request_rec *r, const char *locn, const char *what,
 
     /* Apache doesn't allow us to set a variable body for HTTP_CREATED, so
      * we must manufacture the entire response. */
-    body = apr_psprintf(r->pool, "%s %s has been created.",
-                        what, ap_escape_html(r->pool, locn));
+    body = apr_pstrcat(r->pool, what, " ", ap_escape_html(r->pool, locn),
+                       " has been created.", NULL);
     return dav_error_response(r, HTTP_CREATED, body);
 }
 
@@ -676,7 +709,7 @@ DAV_DECLARE(int) dav_get_depth(request_rec *r, int def_depth)
         return def_depth;
     }
 
-    if (strcasecmp(depth, "infinity") == 0) {
+    if (ap_cstr_casecmp(depth, "infinity") == 0) {
         return DAV_INFINITY;
     }
     else if (strcmp(depth, "0") == 0) {
@@ -725,11 +758,11 @@ static int dav_get_overwrite(request_rec *r)
  * the resource identified by the DAV:checked-in property of the resource
  * identified by the Request-URI.
  */
-static dav_error *dav_get_resource(request_rec *r, int label_allowed,
+DAV_DECLARE(dav_error *) dav_get_resource(request_rec *r, int label_allowed,
                                    int use_checked_in, dav_resource **res_p)
 {
     dav_dir_conf *conf;
-    const char *label = NULL;
+    const char *label = NULL, *base;
     dav_error *err;
 
     /* if the request target can be overridden, get any target selector */
@@ -746,11 +779,27 @@ static dav_error *dav_get_resource(request_rec *r, int label_allowed,
                              ap_escape_html(r->pool, r->uri)));
     }
 
+    /* Take the repos root from DAVBasePath if configured, else the
+     * path of the enclosing section. */
+    base = conf->base ? conf->base : conf->dir;
+
     /* resolve the resource */
-    err = (*conf->provider->repos->get_resource)(r, conf->dir,
+    err = (*conf->provider->repos->get_resource)(r, base,
                                                  label, use_checked_in,
                                                  res_p);
     if (err != NULL) {
+        /* In the error path, give a hint that DavBasePath needs to be
+         * used if the location was configured via a regex match. */
+        if (!conf->base) {
+            core_dir_config *cdc = ap_get_core_module_config(r->per_dir_config);
+
+            if (cdc->r) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, APLOGNO(10484)
+                             "failed to find repository for location configured "
+                             "via regex match - missing DAVBasePath?");
+            }
+        }
+
         err = dav_push_error(r->pool, err->status, 0,
                              "Could not fetch resource information.", err);
         return err;
@@ -774,7 +823,9 @@ static dav_error *dav_get_resource(request_rec *r, int label_allowed,
     return NULL;
 }
 
-static dav_error * dav_open_lockdb(request_rec *r, int ro, dav_lockdb **lockdb)
+DAV_DECLARE(dav_error *) dav_open_lockdb(request_rec *r,
+                                         int ro,
+                                         dav_lockdb **lockdb)
 {
     const dav_hooks_locks *hooks = DAV_GET_HOOKS_LOCKS(r);
 
@@ -787,6 +838,11 @@ static dav_error * dav_open_lockdb(request_rec *r, int ro, dav_lockdb **lockdb)
     return (*hooks->open_lockdb)(r, ro, 0, lockdb);
 }
 
+DAV_DECLARE(void) dav_close_lockdb(dav_lockdb *lockdb)
+{
+    (lockdb->hooks->close_lockdb)(lockdb);
+}
+
 /**
  * @return  1 if valid content-range,
  *          0 if no content-range,
@@ -799,16 +855,15 @@ static int dav_parse_range(request_rec *r,
     char *range;
     char *dash;
     char *slash;
-    char *errp;
 
     range_c = apr_table_get(r->headers_in, "content-range");
     if (range_c == NULL)
         return 0;
 
     range = apr_pstrdup(r->pool, range_c);
-    if (strncasecmp(range, "bytes ", 6) != 0
-        || (dash = ap_strchr(range, '-')) == NULL
-        || (slash = ap_strchr(range, '/')) == NULL) {
+    if (ap_cstr_casecmpn(range, "bytes ", 6) != 0
+        || (dash = ap_strchr(range + 6, '-')) == NULL
+        || (slash = ap_strchr(range + 6, '/')) == NULL) {
         /* malformed header */
         return -1;
     }
@@ -816,20 +871,19 @@ static int dav_parse_range(request_rec *r,
     *dash++ = *slash++ = '\0';
 
     /* detect invalid ranges */
-    if (apr_strtoff(range_start, range + 6, &errp, 10)
-        || *errp || *range_start < 0) {
+    if (!ap_parse_strict_length(range_start, range + 6)) {
         return -1;
     }
-    if (apr_strtoff(range_end, dash, &errp, 10)
-        || *errp || *range_end < 0 || *range_end < *range_start) {
+    if (!ap_parse_strict_length(range_end, dash)
+            || *range_end < *range_start) {
         return -1;
     }
 
     if (*slash != '*') {
         apr_off_t dummy;
 
-        if (apr_strtoff(&dummy, slash, &errp, 10)
-            || *errp || dummy <= *range_end) {
+        if (!ap_parse_strict_length(&dummy, slash)
+                || dummy <= *range_end) {
             return -1;
         }
     }
@@ -854,6 +908,12 @@ static int dav_method_get(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -901,6 +961,12 @@ static int dav_method_post(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* Note: depth == 0. Implies no need for a multistatus response. */
     if ((err = dav_validate_request(r, resource, 0, NULL, NULL,
                                     DAV_VALIDATE_RESOURCE, NULL)) != NULL) {
@@ -934,6 +1000,12 @@ static int dav_method_put(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* If not a file or collection resource, PUT not allowed */
     if (resource->type != DAV_RESOURCE_TYPE_REGULAR
         && resource->type != DAV_RESOURCE_TYPE_WORKING) {
@@ -996,12 +1068,17 @@ static int dav_method_put(request_rec *r)
     /* Create the new file in the repository */
     if ((err = (*resource->hooks->open_stream)(resource, mode,
                                                &stream)) != NULL) {
-        /* ### assuming FORBIDDEN is probably not quite right... */
-        err = dav_push_error(r->pool, HTTP_FORBIDDEN, 0,
-                             apr_psprintf(r->pool,
-                                          "Unable to PUT new contents for %s.",
-                                          ap_escape_html(r->pool, r->uri)),
-                             err);
+        int status = err->status ? err->status : HTTP_FORBIDDEN;
+        if (status > 299) {
+            err = dav_push_error(r->pool, status, 0,
+                                 apr_psprintf(r->pool,
+                                              "Unable to PUT new contents for %s.",
+                                              ap_escape_html(r->pool, r->uri)),
+                                 err);
+        }
+        else {
+            err = NULL;
+        }
     }
 
     if (err == NULL && has_range) {
@@ -1204,6 +1281,13 @@ static int dav_method_delete(request_rec *r)
                            &resource);
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
+
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -1319,10 +1403,10 @@ static dav_error *dav_gen_supported_methods(request_rec *r,
             if (elts[i].key == NULL)
                 continue;
 
-            s = apr_psprintf(r->pool,
-                             "<D:supported-method D:name=\"%s\"/>"
-                             DEBUG_CR,
-                             elts[i].key);
+            s = apr_pstrcat(r->pool,
+                            "<D:supported-method D:name=\"",
+                            elts[i].key,
+                            "\"/>" DEBUG_CR, NULL);
             apr_text_append(r->pool, body, s);
         }
     }
@@ -1348,10 +1432,9 @@ static dav_error *dav_gen_supported_methods(request_rec *r,
 
                 /* see if method is supported */
                 if (apr_table_get(methods, name) != NULL) {
-                    s = apr_psprintf(r->pool,
-                                     "<D:supported-method D:name=\"%s\"/>"
-                                     DEBUG_CR,
-                                     name);
+                    s = apr_pstrcat(r->pool,
+                                    "<D:supported-method D:name=\"",
+                                    name, "\"/>" DEBUG_CR, NULL);
                     apr_text_append(r->pool, body, s);
                 }
             }
@@ -1375,8 +1458,7 @@ static dav_error *dav_gen_supported_live_props(request_rec *r,
     dav_error *err;
 
     /* open lock database, to report on supported lock properties */
-    /* ### should open read-only */
-    if ((err = dav_open_lockdb(r, 0, &lockdb)) != NULL) {
+    if ((err = dav_open_lockdb(r, 1, &lockdb)) != NULL) {
         return dav_push_error(r->pool, err->status, 0,
                               "The lock database could not be opened, "
                               "preventing the reporting of supported lock "
@@ -1385,7 +1467,7 @@ static dav_error *dav_gen_supported_live_props(request_rec *r,
     }
 
     /* open the property database (readonly) for the resource */
-    if ((err = dav_open_propdb(r, lockdb, resource, 1, NULL,
+    if ((err = dav_open_propdb(r, lockdb, resource, DAV_PROPDB_RO, NULL,
                                &propdb)) != NULL) {
         if (lockdb != NULL)
             (*lockdb->hooks->close_lockdb)(lockdb);
@@ -1451,89 +1533,95 @@ static dav_error *dav_gen_supported_live_props(request_rec *r,
     return err;
 }
 
+
 /* generate DAV:supported-report-set OPTIONS response */
 static dav_error *dav_gen_supported_reports(request_rec *r,
                                             const dav_resource *resource,
                                             const apr_xml_elem *elem,
-                                            const dav_hooks_vsn *vsn_hooks,
                                             apr_text_header *body)
 {
     apr_xml_elem *child;
     apr_xml_attr *attr;
-    dav_error *err;
+    dav_error *err = NULL;
     char *s;
+    apr_array_header_t *reports;
+    const dav_report_elem *rp;
 
     apr_text_append(r->pool, body, "<D:supported-report-set>" DEBUG_CR);
 
-    if (vsn_hooks != NULL) {
-        const dav_report_elem *reports;
-        const dav_report_elem *rp;
+    reports = apr_array_make(r->pool, 5, sizeof(const char *));
+    dav_run_gather_reports(r, resource, reports, &err);
+    if (err != NULL) {
+        return dav_push_error(r->pool, err->status, 0,
+                "DAV:supported-report-set could not be "
+                "determined due to a problem fetching the "
+                "available reports for this resource.",
+                err);
+    }
 
-        if ((err = (*vsn_hooks->avail_reports)(resource, &reports)) != NULL) {
-            return dav_push_error(r->pool, err->status, 0,
-                                  "DAV:supported-report-set could not be "
-                                  "determined due to a problem fetching the "
-                                  "available reports for this resource.",
-                                  err);
+    if (elem->first_child == NULL) {
+        int i;
+
+        /* show all supported reports */
+        rp = (const dav_report_elem *)reports->elts;
+        for (i = 0; i < reports->nelts; i++, rp++) {
+            /* Note: we presume reports->namespace is
+             * properly XML/URL quoted */
+            s = apr_pstrcat(r->pool,
+                    "<D:supported-report D:name=\"",
+                    rp->name,
+                    "\" D:namespace=\"",
+                    rp->nmspace,
+                    "\"/>" DEBUG_CR, NULL);
+            apr_text_append(r->pool, body, s);
         }
+    }
+    else {
+        /* check for support of specific report */
+        for (child = elem->first_child; child != NULL; child = child->next) {
+            if (child->ns == APR_XML_NS_DAV_ID
+                    && strcmp(child->name, "supported-report") == 0) {
+                const char *name = NULL;
+                const char *nmspace = NULL;
+                int i;
 
-        if (reports != NULL) {
-            if (elem->first_child == NULL) {
-                /* show all supported reports */
-                for (rp = reports; rp->nmspace != NULL; ++rp) {
-                    /* Note: we presume reports->namespace is
-                     * properly XML/URL quoted */
-                    s = apr_psprintf(r->pool,
-                                     "<D:supported-report D:name=\"%s\" "
-                                     "D:namespace=\"%s\"/>" DEBUG_CR,
-                                     rp->name, rp->nmspace);
-                    apr_text_append(r->pool, body, s);
+                /* go through attributes to find name and namespace */
+                for (attr = child->attr; attr != NULL; attr = attr->next) {
+                    if (attr->ns == APR_XML_NS_DAV_ID) {
+                        if (strcmp(attr->name, "name") == 0)
+                            name = attr->value;
+                        else if (strcmp(attr->name, "namespace") == 0)
+                            nmspace = attr->value;
+                    }
                 }
-            }
-            else {
-                /* check for support of specific report */
-                for (child = elem->first_child; child != NULL; child = child->next) {
-                    if (child->ns == APR_XML_NS_DAV_ID
-                        && strcmp(child->name, "supported-report") == 0) {
-                        const char *name = NULL;
-                        const char *nmspace = NULL;
-
-                        /* go through attributes to find name and namespace */
-                        for (attr = child->attr; attr != NULL; attr = attr->next) {
-                            if (attr->ns == APR_XML_NS_DAV_ID) {
-                                if (strcmp(attr->name, "name") == 0)
-                                    name = attr->value;
-                                else if (strcmp(attr->name, "namespace") == 0)
-                                    nmspace = attr->value;
-                            }
-                        }
-
-                        if (name == NULL) {
-                            return dav_new_error(r->pool, HTTP_BAD_REQUEST, 0, 0,
-                                                 "A DAV:supported-report element "
-                                                 "does not have a \"name\" attribute");
-                        }
-
-                        /* default namespace to DAV: */
-                        if (nmspace == NULL)
-                            nmspace = "DAV:";
-
-                        for (rp = reports; rp->nmspace != NULL; ++rp) {
-                            if (strcmp(name, rp->name) == 0
-                                && strcmp(nmspace, rp->nmspace) == 0) {
-                                /* Note: we presume reports->nmspace is
-                                 * properly XML/URL quoted
-                                 */
-                                s = apr_psprintf(r->pool,
-                                                 "<D:supported-report "
-                                                 "D:name=\"%s\" "
-                                                 "D:namespace=\"%s\"/>"
-                                                 DEBUG_CR,
-                                                 rp->name, rp->nmspace);
-                                apr_text_append(r->pool, body, s);
-                                break;
-                            }
-                        }
+
+                if (name == NULL) {
+                    return dav_new_error(r->pool, HTTP_BAD_REQUEST, 0, 0,
+                            "A DAV:supported-report element "
+                            "does not have a \"name\" attribute");
+                }
+
+                /* default namespace to DAV: */
+                if (nmspace == NULL) {
+                    nmspace = "DAV:";
+                }
+
+                rp = (const dav_report_elem *)reports->elts;
+                for (i = 0; i < reports->nelts; i++, rp++) {
+                    if (strcmp(name, rp->name) == 0
+                            && strcmp(nmspace, rp->nmspace) == 0) {
+                        /* Note: we presume reports->nmspace is
+                         * properly XML/URL quoted
+                         */
+                        s = apr_pstrcat(r->pool,
+                                "<D:supported-report "
+                                "D:name=\"",
+                                rp->name,
+                                "\" D:namespace=\"",
+                                rp->nmspace,
+                                "\"/>" DEBUG_CR, NULL);
+                        apr_text_append(r->pool, body, s);
+                        break;
                     }
                 }
             }
@@ -1640,6 +1728,12 @@ static int dav_method_options(request_rec *r)
     }
     /* note: doc == NULL if no request body */
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (doc && !dav_validate_root(doc, "options")) {
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00584)
                       "The \"options\" element was not found.");
@@ -1903,7 +1997,7 @@ static int dav_method_options(request_rec *r)
                 core_option = 1;
             }
             else if (strcmp(elem->name, "supported-report-set") == 0) {
-                err = dav_gen_supported_reports(r, resource, elem, vsn_hooks, &body);
+                err = dav_gen_supported_reports(r, resource, elem, &body);
                 core_option = 1;
             }
         }
@@ -1968,10 +2062,23 @@ static void dav_cache_badprops(dav_walker_ctx *ctx)
 static dav_error * dav_propfind_walker(dav_walk_resource *wres, int calltype)
 {
     dav_walker_ctx *ctx = wres->walk_ctx;
+    dav_dir_conf *conf;
+    int flags = DAV_PROPDB_RO;
     dav_error *err;
     dav_propdb *propdb;
     dav_get_props_result propstats = { 0 };
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(ctx->r, NULL, wres->resource, ctx->doc, &err) != DECLINED
+            && err) {
+        apr_pool_clear(ctx->scratchpool);
+        return NULL;
+    }
+
+    conf = ap_get_module_config(ctx->r->per_dir_config, &dav_module);
+    if (conf && conf->allow_lockdiscovery == DAV_ENABLED_OFF)
+        flags |= DAV_PROPDB_DISABLE_LOCKDISCOVERY;
+
     /*
     ** Note: ctx->doc can only be NULL for DAV_PROPFIND_IS_ALLPROP. Since
     ** dav_get_allprops() does not need to do namespace translation,
@@ -1980,8 +2087,9 @@ static dav_error * dav_propfind_walker(dav_walk_resource *wres, int calltype)
     ** Note: we cast to lose the "const". The propdb won't try to change
     ** the resource, however, since we are opening readonly.
     */
-    err = dav_open_propdb(ctx->r, ctx->w.lockdb, wres->resource, 1,
-                          ctx->doc ? ctx->doc->namespaces : NULL, &propdb);
+    err = dav_popen_propdb(ctx->scratchpool,
+                           ctx->r, ctx->w.lockdb, wres->resource, flags,
+                           ctx->doc ? ctx->doc->namespaces : NULL, &propdb);
     if (err != NULL) {
         /* ### do something with err! */
 
@@ -2012,10 +2120,10 @@ static dav_error * dav_propfind_walker(dav_walk_resource *wres, int calltype)
                                  : DAV_PROP_INSERT_NAME;
         propstats = dav_get_allprops(propdb, what);
     }
-    dav_close_propdb(propdb);
-
     dav_stream_response(wres, 0, &propstats, ctx->scratchpool);
 
+    dav_close_propdb(propdb);
+
     /* at this point, ctx->scratchpool has been used to stream a
        single response.  this function fully controls the pool, and
        thus has the right to clear it for the next iteration of this
@@ -2042,6 +2150,17 @@ static int dav_method_propfind(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    if ((result = ap_xml_parse_input(r, &doc)) != OK) {
+        return result;
+    }
+    /* note: doc == NULL if no request body */
+
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (dav_get_resource_state(r, resource) == DAV_RESOURCE_NULL) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -2069,11 +2188,6 @@ static int dav_method_propfind(request_rec *r)
         }
     }
 
-    if ((result = ap_xml_parse_input(r, &doc)) != OK) {
-        return result;
-    }
-    /* note: doc == NULL if no request body */
-
     if (doc && !dav_validate_root(doc, "propfind")) {
         /* This supplies additional information for the default message. */
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00585)
@@ -2103,7 +2217,7 @@ static int dav_method_propfind(request_rec *r)
         return HTTP_BAD_REQUEST;
     }
 
-    ctx.w.walk_type = DAV_WALKTYPE_NORMAL | DAV_WALKTYPE_AUTH;
+    ctx.w.walk_type = DAV_WALKTYPE_NORMAL | DAV_WALKTYPE_AUTH | DAV_WALKTYPE_TOLERANT;
     ctx.w.func = dav_propfind_walker;
     ctx.w.walk_ctx = &ctx;
     ctx.w.pool = r->pool;
@@ -2113,9 +2227,9 @@ static int dav_method_propfind(request_rec *r)
     ctx.r = r;
     ctx.bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
     apr_pool_create(&ctx.scratchpool, r->pool);
+    apr_pool_tag(ctx.scratchpool, "mod_dav-scratch");
 
-    /* ### should open read-only */
-    if ((err = dav_open_lockdb(r, 0, &ctx.w.lockdb)) != NULL) {
+    if ((err = dav_open_lockdb(r, 1, &ctx.w.lockdb)) != NULL) {
         err = dav_push_error(r->pool, err->status, 0,
                              "The lock database could not be opened, "
                              "preventing access to the various lock "
@@ -2318,16 +2432,23 @@ static int dav_method_proppatch(request_rec *r)
                            &resource);
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
-    if (!resource->exists) {
-        /* Apache will supply a default error for this. */
-        return HTTP_NOT_FOUND;
-    }
 
     if ((result = ap_xml_parse_input(r, &doc)) != OK) {
         return result;
     }
     /* note: doc == NULL if no request body */
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
+    if (!resource->exists) {
+        /* Apache will supply a default error for this. */
+        return HTTP_NOT_FOUND;
+    }
+
     if (doc == NULL || !dav_validate_root(doc, "propertyupdate")) {
         /* This supplies additional information for the default message. */
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00587)
@@ -2352,7 +2473,8 @@ static int dav_method_proppatch(request_rec *r)
         return dav_handle_err(r, err, NULL);
     }
 
-    if ((err = dav_open_propdb(r, NULL, resource, 0, doc->namespaces,
+    if ((err = dav_open_propdb(r, NULL, resource,
+                               DAV_PROPDB_NONE, doc->namespaces,
                                &propdb)) != NULL) {
         /* undo any auto-checkout */
         dav_auto_checkin(r, resource, 1 /*undo*/, 0 /*unlock*/, &av_info);
@@ -2470,7 +2592,7 @@ static int process_mkcol_body(request_rec *r)
     r->remaining = 0;
 
     if (tenc) {
-        if (strcasecmp(tenc, "chunked")) {
+        if (ap_cstr_casecmp(tenc, "chunked")) {
             /* Use this instead of Apache's default error string */
             ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00589)
                           "Unknown Transfer-Encoding %s", tenc);
@@ -2480,20 +2602,13 @@ static int process_mkcol_body(request_rec *r)
         r->read_chunked = 1;
     }
     else if (lenp) {
-        const char *pos = lenp;
-
-        while (apr_isdigit(*pos) || apr_isspace(*pos)) {
-            ++pos;
-        }
-
-        if (*pos != '\0') {
+        if (!ap_parse_strict_length(&r->remaining, lenp)) {
+            r->remaining = 0;
             /* This supplies additional information for the default message. */
             ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00590)
                           "Invalid Content-Length %s", lenp);
             return HTTP_BAD_REQUEST;
         }
-
-        r->remaining = apr_atoi64(lenp);
     }
 
     if (r->read_chunked || r->remaining > 0) {
@@ -2534,6 +2649,12 @@ static int dav_method_mkcol(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (resource->exists) {
         /* oops. something was already there! */
 
@@ -2654,6 +2775,12 @@ static int dav_method_copymove(request_rec *r, int is_move)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -2676,7 +2803,7 @@ static int dav_method_copymove(request_rec *r, int is_move)
         const char *nscp_path = apr_table_get(r->headers_in, "New-uri");
 
         if (nscp_host != NULL && nscp_path != NULL)
-            dest = apr_psprintf(r->pool, "http://%s%s", nscp_host, nscp_path);
+            dest = apr_pstrcat(r->pool, "http://", nscp_host, nscp_path, NULL);
     }
     if (dest == NULL) {
         /* This supplies additional information for the default message. */
@@ -2720,6 +2847,12 @@ static int dav_method_copymove(request_rec *r, int is_move)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, resnew, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* are the two resources handled by the same repository? */
     if (resource->hooks != resnew->hooks) {
         /* ### this message exposes some backend config, but screw it... */
@@ -3071,6 +3204,12 @@ static int dav_method_lock(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* Check if parent collection exists */
     if ((err = resource->hooks->get_parent_resource(resource, &parent)) != NULL) {
         /* ### add a higher-level description? */
@@ -3270,6 +3409,12 @@ static int dav_method_unlock(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     resource_state = dav_get_resource_state(r, resource);
 
     /*
@@ -3294,8 +3439,8 @@ static int dav_method_unlock(request_rec *r)
 
     /* ### RFC 2518 s. 8.11: If this resource is locked by locktoken,
      *     _all_ resources locked by locktoken are released.  It does not say
-     *     resource has to be the root of an infinte lock.  Thus, an UNLOCK
-     *     on any part of an infinte lock will remove the lock on all resources.
+     *     resource has to be the root of an infinite lock.  Thus, an UNLOCK
+     *     on any part of an infinite lock will remove the lock on all resources.
      *
      *     For us, if r->filename represents an indirect lock (part of an infinity lock),
      *     we must actually perform an UNLOCK on the direct lock for this resource.
@@ -3329,15 +3474,21 @@ static int dav_method_vsn_control(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
-    /* remember the pre-creation resource state */
-    resource_state = dav_get_resource_state(r, resource);
-
     /* parse the request body (may be a version-control element) */
     if ((result = ap_xml_parse_input(r, &doc)) != OK) {
         return result;
     }
     /* note: doc == NULL if no request body */
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
+    /* remember the pre-creation resource state */
+    resource_state = dav_get_resource_state(r, resource);
+
     if (doc != NULL) {
         const apr_xml_elem *child;
         apr_size_t tsize;
@@ -3582,6 +3733,12 @@ static int dav_method_checkout(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -3658,6 +3815,12 @@ static int dav_method_uncheckout(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -3735,6 +3898,12 @@ static int dav_method_checkin(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -3856,6 +4025,12 @@ static int dav_method_update(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -3930,6 +4105,9 @@ typedef struct dav_label_walker_ctx
     /* input: */
     dav_walk_params w;
 
+    /* original request */
+    request_rec *r;
+
     /* label being manipulated */
     const char *label;
 
@@ -3949,13 +4127,19 @@ static dav_error * dav_label_walker(dav_walk_resource *wres, int calltype)
     dav_label_walker_ctx *ctx = wres->walk_ctx;
     dav_error *err = NULL;
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(ctx->r, NULL, wres->resource, NULL, &err) != DECLINED
+            && err) {
+    	/* precondition failed, dropping through */
+    }
+
     /* Check the state of the resource: must be a version or
      * non-checkedout version selector
      */
     /* ### need a general mechanism for reporting precondition violations
      * ### (should be returning XML document for 403/409 responses)
      */
-    if (wres->resource->type != DAV_RESOURCE_TYPE_VERSION &&
+    else if (wres->resource->type != DAV_RESOURCE_TYPE_VERSION &&
         (wres->resource->type != DAV_RESOURCE_TYPE_REGULAR
          || !wres->resource->versioned)) {
         err = dav_new_error(ctx->w.pool, HTTP_CONFLICT, 0, 0,
@@ -4001,11 +4185,23 @@ static int dav_method_label(request_rec *r)
     if (vsn_hooks == NULL || vsn_hooks->add_label == NULL)
         return DECLINED;
 
+    /* parse the request body */
+    if ((result = ap_xml_parse_input(r, &doc)) != OK) {
+        return result;
+    }
+
     /* Ask repository module to resolve the resource */
     err = dav_get_resource(r, 1 /* label_allowed */, 0 /* use_checked_in */,
                            &resource);
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
+
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -4017,11 +4213,6 @@ static int dav_method_label(request_rec *r)
         return HTTP_BAD_REQUEST;
     }
 
-    /* parse the request body */
-    if ((result = ap_xml_parse_input(r, &doc)) != OK) {
-        return result;
-    }
-
     if (doc == NULL || !dav_validate_root(doc, "label")) {
         /* This supplies additional information for the default message. */
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00610)
@@ -4070,6 +4261,7 @@ static int dav_method_label(request_rec *r)
     ctx.w.walk_ctx = &ctx;
     ctx.w.pool = r->pool;
     ctx.w.root = resource;
+    ctx.r = r;
     ctx.vsn_hooks = vsn_hooks;
 
     err = (*resource->hooks->walk)(&ctx.w, depth, &multi_status);
@@ -4109,21 +4301,60 @@ static int dav_method_label(request_rec *r)
     return DONE;
 }
 
+static int dav_core_deliver_report(request_rec *r,
+                          const dav_resource *resource,
+                          const apr_xml_doc *doc,
+                          ap_filter_t *output, dav_error **err)
+{
+    const dav_hooks_vsn *vsn_hooks = DAV_GET_HOOKS_VSN(r);
+
+    if (vsn_hooks) {
+        *err = (*vsn_hooks->deliver_report)(r, resource, doc,
+                                            r->output_filters);
+        return OK;
+    }
+
+    return DECLINED;
+}
+
+static void dav_core_gather_reports(
+    request_rec *r,
+    const dav_resource *resource,
+    apr_array_header_t *reports,
+    dav_error **err)
+{
+    const dav_hooks_vsn *vsn_hooks = DAV_GET_HOOKS_VSN(r);
+
+    if (vsn_hooks) {
+        const dav_report_elem *rp;
+
+        (*err) = (*vsn_hooks->avail_reports)(resource, &rp);
+        while (rp && rp->name) {
+
+            dav_report_elem *report = apr_array_push(reports);
+
+            report->nmspace = rp->nmspace;
+            report->name = rp->name;
+
+            rp++;
+        }
+    }
+
+}
+
 static int dav_method_report(request_rec *r)
 {
     dav_resource *resource;
     const dav_hooks_vsn *vsn_hooks = DAV_GET_HOOKS_VSN(r);
-    int result;
-    int label_allowed;
     apr_xml_doc *doc;
-    dav_error *err;
+    dav_error *err = NULL;
 
-    /* If no versioning provider, decline the request */
-    if (vsn_hooks == NULL)
-        return DECLINED;
+    int result;
+    int label_allowed;
 
-    if ((result = ap_xml_parse_input(r, &doc)) != OK)
+    if ((result = ap_xml_parse_input(r, &doc)) != OK) {
         return result;
+    }
     if (doc == NULL) {
         /* This supplies additional information for the default msg. */
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00614)
@@ -4135,11 +4366,18 @@ static int dav_method_report(request_rec *r)
      * First determine whether a Target-Selector header is allowed
      * for this report.
      */
-    label_allowed = (*vsn_hooks->report_label_header_allowed)(doc);
+    label_allowed = vsn_hooks ? (*vsn_hooks->report_label_header_allowed)(doc) : 0;
     err = dav_get_resource(r, label_allowed, 0 /* use_checked_in */,
                            &resource);
-    if (err != NULL)
+    if (err != NULL) {
+        return dav_handle_err(r, err, NULL);
+    }
+
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
         return dav_handle_err(r, err, NULL);
+    }
 
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
@@ -4149,13 +4387,17 @@ static int dav_method_report(request_rec *r)
     /* set up defaults for the report response */
     r->status = HTTP_OK;
     ap_set_content_type(r, DAV_XML_CONTENT_TYPE);
+    err = NULL;
 
     /* run report hook */
-    if ((err = (*vsn_hooks->deliver_report)(r, resource, doc,
-                                            r->output_filters)) != NULL) {
-        if (! r->sent_bodyct)
+    result = dav_run_deliver_report(r, resource, doc,
+            r->output_filters, &err);
+    if (err != NULL) {
+
+        if (! r->sent_bodyct) {
           /* No data has been sent to client yet;  throw normal error. */
           return dav_handle_err(r, err, NULL);
+        }
 
         /* If an error occurred during the report delivery, there's
            basically nothing we can do but abort the connection and
@@ -4168,6 +4410,16 @@ static int dav_method_report(request_rec *r)
                              " a REPORT response.", err);
         dav_log_err(r, err, APLOG_ERR);
         r->connection->aborted = 1;
+
+        return DONE;
+    }
+    switch (result) {
+    case OK:
+        return DONE;
+    case DECLINED:
+        /* No one handled the report */
+        return HTTP_NOT_IMPLEMENTED;
+    default:
         return DONE;
     }
 
@@ -4199,6 +4451,12 @@ static int dav_method_make_workspace(request_rec *r)
         return result;
     }
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (doc == NULL
         || !dav_validate_root(doc, "mkworkspace")) {
         ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(00615)
@@ -4258,6 +4516,12 @@ static int dav_method_make_activity(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* MKACTIVITY does not have a defined request body. */
     if ((result = ap_discard_request_body(r)) != OK) {
         return result;
@@ -4383,6 +4647,12 @@ static int dav_method_merge(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, source_resource, NULL, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     no_auto_merge = dav_find_child(doc->root, "no-auto-merge") != NULL;
     no_checkout = dav_find_child(doc->root, "no-checkout") != NULL;
 
@@ -4400,6 +4670,13 @@ static int dav_method_merge(request_rec *r)
                            &resource);
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
+
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, source_resource, resource, doc, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -4467,6 +4744,12 @@ static int dav_method_bind(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, NULL, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     if (!resource->exists) {
         /* Apache will supply a default error for this. */
         return HTTP_NOT_FOUND;
@@ -4517,6 +4800,12 @@ static int dav_method_bind(request_rec *r)
     if (err != NULL)
         return dav_handle_err(r, err, NULL);
 
+    /* check for any method preconditions */
+    if (dav_run_method_precondition(r, resource, binding, NULL, &err) != DECLINED
+            && err) {
+        return dav_handle_err(r, err, NULL);
+    }
+
     /* are the two resources handled by the same repository? */
     if (resource->hooks != binding->hooks) {
         /* ### this message exposes some backend config, but screw it... */
@@ -4886,6 +5175,11 @@ static void register_hooks(apr_pool_t *p)
     dav_hook_insert_all_liveprops(dav_core_insert_all_liveprops,
                                   NULL, NULL, APR_HOOK_MIDDLE);
 
+    dav_hook_deliver_report(dav_core_deliver_report,
+                            NULL, NULL, APR_HOOK_LAST);
+    dav_hook_gather_reports(dav_core_gather_reports,
+                            NULL, NULL, APR_HOOK_LAST);
+
     dav_core_register_uris(p);
 }
 
@@ -4900,6 +5194,10 @@ static const command_rec dav_cmds[] =
     AP_INIT_TAKE1("DAV", dav_cmd_dav, NULL, ACCESS_CONF,
                   "specify the DAV provider for a directory or location"),
 
+    /* per directory/location */
+    AP_INIT_TAKE1("DAVBasePath", dav_cmd_davbasepath, NULL, ACCESS_CONF,
+                  "specify the DAV repository base URL"),
+
     /* per directory/location, or per server */
     AP_INIT_TAKE1("DAVMinTimeout", dav_cmd_davmintimeout, NULL,
                   ACCESS_CONF|RSRC_CONF,
@@ -4910,6 +5208,11 @@ static const command_rec dav_cmds[] =
                  ACCESS_CONF|RSRC_CONF,
                  "allow Depth infinity PROPFIND requests"),
 
+    /* per directory/location, or per server */
+    AP_INIT_FLAG("DAVLockDiscovery", dav_cmd_davlockdiscovery, NULL,
+                 ACCESS_CONF|RSRC_CONF,
+                 "allow lock discovery by PROPFIND requests"),
+
     { NULL }
 };
 
@@ -4928,6 +5231,9 @@ APR_HOOK_STRUCT(
     APR_HOOK_LINK(gather_propsets)
     APR_HOOK_LINK(find_liveprop)
     APR_HOOK_LINK(insert_all_liveprops)
+    APR_HOOK_LINK(deliver_report)
+    APR_HOOK_LINK(gather_reports)
+    APR_HOOK_LINK(method_precondition)
     )
 
 APR_IMPLEMENT_EXTERNAL_HOOK_VOID(dav, DAV, gather_propsets,
@@ -4944,3 +5250,22 @@ APR_IMPLEMENT_EXTERNAL_HOOK_VOID(dav, DAV, insert_all_liveprops,
                                  (request_rec *r, const dav_resource *resource,
                                   dav_prop_insert what, apr_text_header *phdr),
                                  (r, resource, what, phdr))
+
+APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(dav, DAV, int, deliver_report,
+                                      (request_rec *r,
+                                       const dav_resource *resource,
+                                       const apr_xml_doc *doc,
+                                       ap_filter_t *output, dav_error **err),
+                                      (r, resource, doc, output, err), DECLINED)
+
+APR_IMPLEMENT_EXTERNAL_HOOK_VOID(dav, DAV, gather_reports,
+                                   (request_rec *r, const dav_resource *resource,
+                                    apr_array_header_t *reports, dav_error **err),
+                                   (r, resource, reports, err))
+
+APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(dav, DAV, int, method_precondition,
+                                      (request_rec *r,
+                                       dav_resource *src, const dav_resource *dest,
+                                       const apr_xml_doc *doc,
+                                       dav_error **err),
+                                       (r, src, dest, doc, err), DECLINED)
diff --git a/modules/dav/main/mod_dav.h b/modules/dav/main/mod_dav.h
index 80ad117..c8c54f3 100644
--- a/modules/dav/main/mod_dav.h
+++ b/modules/dav/main/mod_dav.h
@@ -50,7 +50,7 @@ extern "C" {
 
 #define DAV_READ_BLOCKSIZE      2048    /* used for reading input blocks */
 
-#define DAV_RESPONSE_BODY_1     "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n<html><head>\n<title>"
+#define DAV_RESPONSE_BODY_1	"<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">\n<html>\n<head>\n<title>"
 #define DAV_RESPONSE_BODY_2     "</title>\n</head><body>\n<h1>"
 #define DAV_RESPONSE_BODY_3     "</h1>\n<p>"
 #define DAV_RESPONSE_BODY_4     "</p>\n"
@@ -427,6 +427,9 @@ typedef struct dav_resource {
 */
 typedef struct dav_locktoken dav_locktoken;
 
+DAV_DECLARE(dav_error *) dav_get_resource(request_rec *r, int label_allowed,
+                                          int use_checked_in, dav_resource **res_p);
+
 
 /* --------------------------------------------------------------------
 **
@@ -574,8 +577,22 @@ DAV_DECLARE(int) dav_get_depth(request_rec *r, int def_depth);
 
 DAV_DECLARE(int) dav_validate_root(const apr_xml_doc *doc,
                                    const char *tagname);
+DAV_DECLARE(int) dav_validate_root_ns(const apr_xml_doc *doc,
+                                      int ns, const char *tagname);
 DAV_DECLARE(apr_xml_elem *) dav_find_child(const apr_xml_elem *elem,
                                            const char *tagname);
+DAV_DECLARE(apr_xml_elem *) dav_find_child_ns(const apr_xml_elem *elem,
+                                              int ns, const char *tagname);
+DAV_DECLARE(apr_xml_elem *) dav_find_next_ns(const apr_xml_elem *elem,
+                                             int ns, const char *tagname);
+
+/* find and return the attribute with a name in the given namespace */
+DAV_DECLARE(apr_xml_attr *) dav_find_attr_ns(const apr_xml_elem *elem,
+                                             int ns, const char *attrname);
+
+/* find and return the attribute with a given DAV: tagname */
+DAV_DECLARE(apr_xml_attr *) dav_find_attr(const apr_xml_elem *elem,
+                                          const char *attrname);
 
 /* gather up all the CDATA into a single string */
 DAV_DECLARE(const char *) dav_xml_get_cdata(const apr_xml_elem *elem, apr_pool_t *pool,
@@ -644,10 +661,10 @@ DAV_DECLARE(void) dav_xmlns_generate(dav_xmlns_info *xi,
 ** mod_dav 1.0). There are too many dependencies between a dav_resource
 ** (defined by <repos>) and the other functionality.
 **
-** Live properties are not part of the dav_provider structure because they
-** are handled through the APR_HOOK interface (to allow for multiple liveprop
-** providers). The core always provides some properties, and then a given
-** provider will add more properties.
+** Live properties and report extensions are not part of the dav_provider
+** structure because they are handled through the APR_HOOK interface (to
+** allow for multiple providers). The core always provides some
+** properties, and then a given provider will add more properties.
 **
 ** Some providers may need to associate a context with the dav_provider
 ** structure -- the ctx field is available for storing this context. Just
@@ -711,6 +728,68 @@ APR_DECLARE_EXTERNAL_HOOK(dav, DAV, void, insert_all_liveprops,
                          (request_rec *r, const dav_resource *resource,
                           dav_prop_insert what, apr_text_header *phdr))
 
+/*
+** deliver_report: given a parsed report request, process the request
+**                 an deliver the resulting report.
+**
+** The hook implementer should decide whether it should handle the given
+** report, and if so, write the response to the output filter. If the
+** report is not relevant, return DECLINED.
+*/
+APR_DECLARE_EXTERNAL_HOOK(dav, DAV, int, deliver_report,
+                         (request_rec *r,
+                          const dav_resource *resource,
+                          const apr_xml_doc *doc,
+                          ap_filter_t *output, dav_error **err))
+
+/*
+** gather_reports: get all reports.
+**
+** The hook implementor should push one or more dav_report_elem structures
+** containing report names into the specified array. These names are returned
+** in the DAV:supported-reports-set property to let clients know
+** what reports are supported by the installation.
+**
+*/
+APR_DECLARE_EXTERNAL_HOOK(dav, DAV, void, gather_reports,
+                          (request_rec *r, const dav_resource *resource,
+                           apr_array_header_t *reports, dav_error **err))
+
+/*
+ ** method_precondition: check method preconditions.
+ **
+ ** If a WebDAV extension needs to set any preconditions on a method, this
+ ** hook is where to do it. If the precondition fails, return an error
+ ** response with the tagname set to the value of the failed precondition.
+ **
+ ** If the method requires an XML body, this will be read and provided as
+ ** the doc value. If not, doc is NULL. An extension that needs to verify
+ ** the non-XML body of a request should register an input filter to do so
+ ** within this hook.
+ **
+ ** Methods like PUT will supply a single src resource, and the dst will
+ ** be NULL.
+ **
+ ** Methods like COPY or MOVE will trigger this hook twice. The first
+ ** invocation will supply just the source resource. The second invocation
+ ** will supply a source and destination. This allows preconditions on the
+ ** source resource to be verified before making an attempt to get the
+ ** destination resource.
+ **
+ ** Methods like PROPFIND and LABEL will trigger this hook initially for
+ ** the src resource, and then subsequently for each resource that has
+ ** been walked during processing, with the walked resource passed in dst,
+ ** and NULL passed in src.
+ **
+ ** As a rule, the src resource originates from a request that has passed
+ ** through httpd's authn/authz hooks, while the dst resource has not.
+ */
+APR_DECLARE_EXTERNAL_HOOK(dav, DAV, int, method_precondition,
+                          (request_rec *r,
+                           dav_resource *src, const dav_resource *dst,
+                           const apr_xml_doc *doc, dav_error **err))
+
+
 DAV_DECLARE(const dav_hooks_locks *) dav_get_lock_hooks(request_rec *r);
 DAV_DECLARE(const dav_hooks_propdb *) dav_get_propdb_hooks(request_rec *r);
 DAV_DECLARE(const dav_hooks_vsn *) dav_get_vsn_hooks(request_rec *r);
@@ -721,6 +800,7 @@ DAV_DECLARE(void) dav_register_provider(apr_pool_t *p, const char *name,
                                         const dav_provider *hooks);
 DAV_DECLARE(const dav_provider *) dav_lookup_provider(const char *name);
 DAV_DECLARE(const char *) dav_get_provider_name(request_rec *r);
+DAV_DECLARE(const dav_provider *) dav_get_provider(request_rec *r);
 
 
 /* ### deprecated */
@@ -827,6 +907,14 @@ struct dav_hooks_liveprop
     ** property, and does not want it handled as a dead property, it should
     ** return DAV_PROP_INSERT_NOTSUPP.
     **
+    ** Some DAV extensions, like CalDAV, specify both document elements
+    ** and property elements that need to be taken into account when
+    ** generating a property. The document element and property element
+    ** are made available in the dav_liveprop_elem structure under the
+    ** resource, accessible as follows:
+    **
+    ** dav_get_liveprop_element(resource);
+    **
     ** Returns one of DAV_PROP_INSERT_* based on what happened.
     **
     ** ### we may need more context... ie. the lock database
@@ -974,6 +1062,18 @@ DAV_DECLARE(long) dav_get_liveprop_ns_count(void);
 DAV_DECLARE(void) dav_add_all_liveprop_xmlns(apr_pool_t *p,
                                              apr_text_header *phdr);
 
+typedef struct {
+    const apr_xml_doc *doc;
+    const apr_xml_elem *elem;
+} dav_liveprop_elem;
+
+/*
+ ** When calling insert_prop(), the associated request element and
+ ** document is accessible using the following call.
+ */
+DAV_DECLARE(dav_liveprop_elem *) dav_get_liveprop_element(const dav_resource
+                                                          *resource);
+
 /*
 ** The following three functions are part of mod_dav's internal handling
 ** for the core WebDAV properties. They are not part of mod_dav's API.
@@ -1314,8 +1414,12 @@ DAV_DECLARE(const char *)dav_lock_get_activelock(request_rec *r,
                                                  dav_buffer *pbuf);
 
 /* LockDB-related public lock functions */
+DAV_DECLARE(dav_error *) dav_open_lockdb(request_rec *r,
+                                         int ro,
+                                         dav_lockdb **lockdb);
+DAV_DECLARE(void) dav_close_lockdb(dav_lockdb *lockdb);
 DAV_DECLARE(dav_error *) dav_lock_parse_lockinfo(request_rec *r,
-                                                 const dav_resource *resrouce,
+                                                 const dav_resource *resource,
                                                  dav_lockdb *lockdb,
                                                  const apr_xml_doc *doc,
                                                  dav_lock **lock_request);
@@ -1581,15 +1685,28 @@ struct dav_hooks_locks
 
 typedef struct dav_propdb dav_propdb;
 
+#define DAV_PROPDB_NONE                  0 
+#define DAV_PROPDB_RO                    1
+#define DAV_PROPDB_DISABLE_LOCKDISCOVERY 2 
 
 DAV_DECLARE(dav_error *) dav_open_propdb(
     request_rec *r,
     dav_lockdb *lockdb,
     const dav_resource *resource,
-    int ro,
+    int flags,
     apr_array_header_t *ns_xlate,
     dav_propdb **propdb);
 
+DAV_DECLARE(dav_error *) dav_popen_propdb(
+    apr_pool_t *p,
+    request_rec *r,
+    dav_lockdb *lockdb,
+    const dav_resource *resource,
+    int flags,
+    apr_array_header_t *ns_xlate,
+    dav_propdb **propdb);
+
+
 DAV_DECLARE(void) dav_close_propdb(dav_propdb *db);
 
 DAV_DECLARE(dav_get_props_result) dav_get_props(
@@ -1706,6 +1823,7 @@ typedef struct
 #define DAV_WALKTYPE_AUTH       0x0001  /* limit to authorized files */
 #define DAV_WALKTYPE_NORMAL     0x0002  /* walk normal files */
 #define DAV_WALKTYPE_LOCKNULL   0x0004  /* walk locknull resources */
+#define DAV_WALKTYPE_TOLERANT   0x0008  /* tolerate non-fatal errors */
 
     /* callback function and a client context for the walk */
     dav_error * (*func)(dav_walk_resource *wres, int calltype);
diff --git a/modules/dav/main/props.c b/modules/dav/main/props.c
index f64878e..c320f8a 100644
--- a/modules/dav/main/props.c
+++ b/modules/dav/main/props.c
@@ -167,6 +167,8 @@
 
 #define DAV_EMPTY_VALUE                "\0"    /* TWO null terms */
 
+#define DAV_PROP_ELEMENT "mod_dav-element"
+
 struct dav_propdb {
     apr_pool_t *p;                /* the pool we should use */
     request_rec *r;               /* the request record */
@@ -183,6 +185,8 @@ struct dav_propdb {
 
     dav_buffer wb_lock;           /* work buffer for lockdiscovery property */
 
+    int flags;                    /* ro, disable lock discovery */
+
     /* if we ever run a GET subreq, it will be stored here */
     request_rec *subreq;
 
@@ -323,7 +327,7 @@ static void dav_do_prop_subreq(dav_propdb *propdb)
 {
     /* need to escape the uri that's in the resource struct because during
      * the property walker it's not encoded. */
-    const char *e_uri = ap_escape_uri(propdb->resource->pool,
+    const char *e_uri = ap_escape_uri(propdb->p,
                                       propdb->resource->uri);
 
     /* perform a "GET" on the resource's URI (note that the resource
@@ -349,6 +353,11 @@ static dav_error * dav_insert_coreprop(dav_propdb *propdb,
     switch (propid) {
 
     case DAV_PROPID_CORE_lockdiscovery:
+        if (propdb->flags & DAV_PROPDB_DISABLE_LOCKDISCOVERY) {
+            value = "";
+            break;
+        }
+
         if (propdb->lockdb != NULL) {
             dav_lock *locks;
 
@@ -421,18 +430,18 @@ static dav_error * dav_insert_coreprop(dav_propdb *propdb,
             /* use D: prefix to refer to the DAV: namespace URI,
              * and let the namespace attribute default to "DAV:"
              */
-            s = apr_psprintf(propdb->p,
-                            "<D:supported-live-property D:name=\"%s\"/>" DEBUG_CR,
-                            name);
+            s = apr_pstrcat(propdb->p,
+                            "<D:supported-live-property D:name=\"",
+                            name, "\"/>" DEBUG_CR, NULL);
         }
         else if (what == DAV_PROP_INSERT_VALUE && *value != '\0') {
             /* use D: prefix to refer to the DAV: namespace URI */
-            s = apr_psprintf(propdb->p, "<D:%s>%s</D:%s>" DEBUG_CR,
-                            name, value, name);
+            s = apr_pstrcat(propdb->p, "<D:", name, ">", value, "</D:", name,
+                            ">" DEBUG_CR, NULL);
         }
         else {
             /* use D: prefix to refer to the DAV: namespace URI */
-            s = apr_psprintf(propdb->p, "<D:%s/>" DEBUG_CR, name);
+            s = apr_pstrcat(propdb->p, "<D:", name, "/>" DEBUG_CR, NULL);
         }
         apr_text_append(propdb->p, phdr, s);
 
@@ -473,11 +482,11 @@ static void dav_output_prop_name(apr_pool_t *pool,
     const char *s;
 
     if (*name->ns == '\0')
-        s = apr_psprintf(pool, "<%s/>" DEBUG_CR, name->name);
+        s = apr_pstrcat(pool, "<", name->name, "/>" DEBUG_CR, NULL);
     else {
         const char *prefix = dav_xmlns_add_uri(xi, name->ns);
 
-        s = apr_psprintf(pool, "<%s:%s/>" DEBUG_CR, prefix, name->name);
+        s = apr_pstrcat(pool, "<", prefix, ":", name->name, "/>" DEBUG_CR, NULL);
     }
 
     apr_text_append(pool, phdr, s);
@@ -520,11 +529,25 @@ static dav_error *dav_really_open_db(dav_propdb *propdb, int ro)
 
 DAV_DECLARE(dav_error *)dav_open_propdb(request_rec *r, dav_lockdb *lockdb,
                                         const dav_resource *resource,
-                                        int ro,
+                                        int flags,
                                         apr_array_header_t * ns_xlate,
                                         dav_propdb **p_propdb)
 {
-    dav_propdb *propdb = apr_pcalloc(r->pool, sizeof(*propdb));
+    return dav_popen_propdb(r->pool, r, lockdb, resource,
+                            flags, ns_xlate, p_propdb);
+}
+
+DAV_DECLARE(dav_error *)dav_popen_propdb(apr_pool_t *p,
+                                         request_rec *r, dav_lockdb *lockdb,
+                                         const dav_resource *resource,
+                                         int flags,
+                                         apr_array_header_t * ns_xlate,
+                                         dav_propdb **p_propdb)
+{
+    dav_propdb *propdb = NULL;
+
+    propdb = apr_pcalloc(p, sizeof(*propdb));
+    propdb->p = p;
 
     *p_propdb = NULL;
 
@@ -537,7 +560,6 @@ DAV_DECLARE(dav_error *)dav_open_propdb(request_rec *r, dav_lockdb *lockdb,
 #endif
 
     propdb->r = r;
-    apr_pool_create(&propdb->p, r->pool);
     propdb->resource = resource;
     propdb->ns_xlate = ns_xlate;
 
@@ -545,6 +567,8 @@ DAV_DECLARE(dav_error *)dav_open_propdb(request_rec *r, dav_lockdb *lockdb,
 
     propdb->lockdb = lockdb;
 
+    propdb->flags = flags;
+
     /* always defer actual open, to avoid expense of accessing db
      * when only live properties are involved
      */
@@ -562,10 +586,10 @@ DAV_DECLARE(void) dav_close_propdb(dav_propdb *propdb)
         (*propdb->db_hooks->close)(propdb->db);
     }
 
-    /* Currently, mod_dav's pool usage doesn't allow clearing this pool. */
-#if 0
-    apr_pool_destroy(propdb->p);
-#endif
+    if (propdb->subreq) {
+        ap_destroy_sub_req(propdb->subreq);
+        propdb->subreq = NULL;
+    }
 }
 
 DAV_DECLARE(dav_get_props_result) dav_get_allprops(dav_propdb *propdb,
@@ -706,10 +730,24 @@ DAV_DECLARE(dav_get_props_result) dav_get_props(dav_propdb *propdb,
     apr_text_header hdr_ns = { 0 };
     int have_good = 0;
     dav_get_props_result result = { 0 };
+    dav_liveprop_elem *element;
     char *marks_liveprop;
     dav_xmlns_info *xi;
     int xi_filled = 0;
 
+    /* we lose both the document and the element when calling (insert_prop),
+     * make these available in the pool.
+     */
+    element = dav_get_liveprop_element(propdb->resource);
+    if (!element) {
+        element = apr_pcalloc(propdb->resource->pool, sizeof(dav_liveprop_elem));
+        apr_pool_userdata_setn(element, DAV_PROP_ELEMENT, NULL, propdb->resource->pool);
+    }
+    else {
+        memset(element, 0, sizeof(dav_liveprop_elem));
+    }
+    element->doc = doc;
+
     /* ### NOTE: we should pass in TWO buffers -- one for keys, one for
        the marks */
 
@@ -733,13 +771,16 @@ DAV_DECLARE(dav_get_props_result) dav_get_props(dav_propdb *propdb,
         dav_prop_insert inserted;
         dav_prop_name name;
 
+        element->elem = elem;
+
         /*
         ** First try live property providers; if they don't handle
         ** the property, then try looking it up in the propdb.
         */
 
         if (elem->priv == NULL) {
-            elem->priv = apr_pcalloc(propdb->p, sizeof(*priv));
+            /* elem->priv outlives propdb->p. Hence use the request pool */
+            elem->priv = apr_pcalloc(propdb->r->pool, sizeof(*priv));
         }
         priv = elem->priv;
 
@@ -909,6 +950,15 @@ DAV_DECLARE(void) dav_get_liveprop_supported(dav_propdb *propdb,
     }
 }
 
+DAV_DECLARE(dav_liveprop_elem *) dav_get_liveprop_element(const dav_resource *resource)
+{
+    dav_liveprop_elem *element;
+
+    apr_pool_userdata_get((void **)&element, DAV_PROP_ELEMENT, resource->pool);
+
+    return element;
+}
+
 DAV_DECLARE_NONSTD(void) dav_prop_validate(dav_prop_ctx *ctx)
 {
     dav_propdb *propdb = ctx->propdb;
@@ -1047,6 +1097,10 @@ DAV_DECLARE_NONSTD(void) dav_prop_exec(dav_prop_ctx *ctx)
             /*
             ** Delete the property. Ignore errors -- the property is there, or
             ** we are deleting it for a second time.
+            **
+            ** http://tools.ietf.org/html/rfc4918#section-14.23 says
+            ** "Specifying the removal of a property that does not exist is
+            ** not an error"
             */
             /* ### but what about other errors? */
             (void) (*propdb->db_hooks->remove)(propdb->db, &name);
diff --git a/modules/dav/main/std_liveprop.c b/modules/dav/main/std_liveprop.c
index e760c65..cb46b65 100644
--- a/modules/dav/main/std_liveprop.c
+++ b/modules/dav/main/std_liveprop.c
@@ -154,10 +154,10 @@ static dav_prop_insert dav_core_insert_prop(const dav_resource *resource,
     /* assert: info != NULL && info->name != NULL */
 
     if (what == DAV_PROP_INSERT_SUPPORTED) {
-        s = apr_psprintf(p,
-                         "<D:supported-live-property D:name=\"%s\" "
-                         "D:namespace=\"%s\"/>" DEBUG_CR,
-                         info->name, dav_core_namespace_uris[info->ns]);
+        s = apr_pstrcat(p,
+                         "<D:supported-live-property D:name=\"", info->name,
+                         "\" D:namespace=\"", dav_core_namespace_uris[info->ns],
+                         "\"/>" DEBUG_CR, NULL);
     }
     else if (what == DAV_PROP_INSERT_VALUE && *value != '\0') {
         s = apr_psprintf(p, "<lp%ld:%s>%s</lp%ld:%s>" DEBUG_CR,
diff --git a/modules/dav/main/util.c b/modules/dav/main/util.c
index 9f24604..3f7822f 100644
--- a/modules/dav/main/util.c
+++ b/modules/dav/main/util.c
@@ -101,6 +101,9 @@ DAV_DECLARE(dav_error*) dav_join_error(dav_error *dest, dav_error *src)
     return dest;
 }
 
+/* ### Unclear if this was designed to be used with an uninitialized
+ * dav_buffer struct, but is used on by dav_lock_get_activelock().
+ * Hence check for pbuf->buf. */
 DAV_DECLARE(void) dav_check_bufsize(apr_pool_t * p, dav_buffer *pbuf,
                                     apr_size_t extra_needed)
 {
@@ -110,7 +113,8 @@ DAV_DECLARE(void) dav_check_bufsize(apr_pool_t * p, dav_buffer *pbuf,
 
         pbuf->alloc_len += extra_needed + DAV_BUFFER_PAD;
         newbuf = apr_palloc(p, pbuf->alloc_len);
-        memcpy(newbuf, pbuf->buf, pbuf->cur_len);
+        if (pbuf->buf)
+            memcpy(newbuf, pbuf->buf, pbuf->cur_len);
         pbuf->buf = newbuf;
     }
 }
@@ -240,7 +244,7 @@ DAV_DECLARE(dav_lookup_result) dav_lookup_uri(const char *uri,
            request. the port must match our port.
         */
         port = r->connection->local_addr->port;
-        if (strcasecmp(comp.scheme, scheme) != 0
+        if (ap_cstr_casecmp(comp.scheme, scheme) != 0
 #ifdef APACHE_PORT_HANDLING_IS_BUSTED
             || comp.port != port
 #endif
@@ -312,26 +316,71 @@ DAV_DECLARE(dav_lookup_result) dav_lookup_uri(const char *uri,
 */
 
 /* validate that the root element uses a given DAV: tagname (TRUE==valid) */
-DAV_DECLARE(int) dav_validate_root(const apr_xml_doc *doc,
-                                   const char *tagname)
+DAV_DECLARE(int) dav_validate_root_ns(const apr_xml_doc *doc,
+                                      int ns, const char *tagname)
 {
     return doc->root &&
-        doc->root->ns == APR_XML_NS_DAV_ID &&
+        doc->root->ns == ns &&
         strcmp(doc->root->name, tagname) == 0;
 }
 
-/* find and return the (unique) child with a given DAV: tagname */
-DAV_DECLARE(apr_xml_elem *) dav_find_child(const apr_xml_elem *elem,
-                                           const char *tagname)
+/* validate that the root element uses a given DAV: tagname (TRUE==valid) */
+DAV_DECLARE(int) dav_validate_root(const apr_xml_doc *doc,
+                                   const char *tagname)
+{
+	return dav_validate_root_ns(doc, APR_XML_NS_DAV_ID, tagname);
+}
+
+/* find and return the next child with a tagname in the given namespace */
+DAV_DECLARE(apr_xml_elem *) dav_find_next_ns(const apr_xml_elem *elem,
+                                             int ns, const char *tagname)
+{
+    apr_xml_elem *child = elem->next;
+
+    for (; child; child = child->next)
+        if (child->ns == ns && !strcmp(child->name, tagname))
+            return child;
+    return NULL;
+}
+
+/* find and return the (unique) child with a tagname in the given namespace */
+DAV_DECLARE(apr_xml_elem *) dav_find_child_ns(const apr_xml_elem *elem,
+                                              int ns, const char *tagname)
 {
     apr_xml_elem *child = elem->first_child;
 
     for (; child; child = child->next)
-        if (child->ns == APR_XML_NS_DAV_ID && !strcmp(child->name, tagname))
+        if (child->ns == ns && !strcmp(child->name, tagname))
             return child;
     return NULL;
 }
 
+/* find and return the (unique) child with a given DAV: tagname */
+DAV_DECLARE(apr_xml_elem *) dav_find_child(const apr_xml_elem *elem,
+                                           const char *tagname)
+{
+	return dav_find_child_ns(elem, APR_XML_NS_DAV_ID, tagname);
+}
+
+/* find and return the attribute with a name in the given namespace */
+DAV_DECLARE(apr_xml_attr *) dav_find_attr_ns(const apr_xml_elem *elem,
+                                             int ns, const char *attrname)
+{
+    apr_xml_attr *attr = elem->attr;
+
+    for (; attr; attr = attr->next)
+        if (attr->ns == ns && !strcmp(attr->name, attrname))
+            return attr;
+    return NULL;
+}
+
+/* find and return the attribute with a given DAV: tagname */
+DAV_DECLARE(apr_xml_attr *) dav_find_attr(const apr_xml_elem *elem,
+                                          const char *attrname)
+{
+	return dav_find_attr_ns(elem, APR_XML_NS_DAV_ID, attrname);
+}
+
 /* gather up all the CDATA into a single string */
 DAV_DECLARE(const char *) dav_xml_get_cdata(const apr_xml_elem *elem, apr_pool_t *pool,
                               int strip_white)
@@ -470,8 +519,8 @@ DAV_DECLARE(void) dav_xmlns_generate(dav_xmlns_info *xi,
 
         apr_hash_this(hi, &prefix, NULL, &uri);
 
-        s = apr_psprintf(xi->pool, " xmlns:%s=\"%s\"",
-                         (const char *)prefix, (const char *)uri);
+        s = apr_pstrcat(xi->pool, " xmlns:", (const char *)prefix, "=\"",
+                        (const char *)uri, "\"", NULL);
         apr_text_append(xi->pool, phdr, s);
     }
 }
@@ -660,7 +709,13 @@ static dav_error * dav_process_if_header(request_rec *r, dav_if_header **p_ih)
             /* note that parsed_uri.path is allocated; we can trash it */
 
             /* clean up the URI a bit */
-            ap_getparents(parsed_uri.path);
+            if (!ap_normalize_path(parsed_uri.path,
+                                   AP_NORMALIZE_NOT_ABOVE_ROOT |
+                                   AP_NORMALIZE_DECODE_UNRESERVED)) {
+                return dav_new_error(r->pool, HTTP_BAD_REQUEST,
+                                     DAV_ERR_IF_TAGGED, rv,
+                                     "Invalid URI path tagged If-header.");
+            }
 
             /* the resources we will compare to have unencoded paths */
             if (ap_unescape_url(parsed_uri.path) != OK) {
@@ -746,8 +801,14 @@ static dav_error * dav_process_if_header(request_rec *r, dav_if_header **p_ih)
                                                  "for the same state.");
                         }
                         condition = DAV_IF_COND_NOT;
+                        list += 2;
+                    }
+                    else {
+                        return dav_new_error(r->pool, HTTP_BAD_REQUEST,
+                                             DAV_ERR_IF_UNK_CHAR, 0,
+                                             "Invalid \"If:\" header: "
+                                             "Unexpected character in List");
                     }
-                    list += 2;
                     break;
 
                 case ' ':