Merge r1814968 from trunk:

core: silently ignore a not existent file path when IncludeOptional
     is used.

In https://bz.apache.org/bugzilla/show_bug.cgi?id=57585 some use cases
were reported in which IncludeOptional seems to be too strict in its
sanity checks.

This change is a proposal to relax IncludeOptional checks to silently
fail when a file path is not existent rather than returning SyntaxError.

Submitted by: elukey
Reviewed by: elukey, jim, niq


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1818964 13f79535-47bb-0310-9956-ffa450edef68

3 files changed, 24 insertions, 5 deletions

diff --git a/CHANGES b/CHANGES
index 3a0f27bafd..95a7dda78e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ Changes with Apache 2.4.30
      the workers when the latter fails to add a connection to the pollset.
      [Yann Ylavic]
 
+  *) core: silently ignore a not existent file path when IncludeOptional
+     is used. PR 57585. [Alberto Murillo Silva <powerbsd yahoo.com>, Luca Toscano]
+
   *) mod_macro: fix usability of globally defined macros in .htaccess files.
      PR 57525.  [Jose Kahan <jose w3.org>, Yann Ylavic]
 
diff --git a/docs/manual/mod/core.xml b/docs/manual/mod/core.xml
index a1c10e7718..24401d6ef4 100644
--- a/docs/manual/mod/core.xml
+++ b/docs/manual/mod/core.xml
@@ -2404,15 +2404,16 @@ the server configuration files</description>
 <contextlist><context>server config</context><context>virtual host</context>
 <context>directory</context>
 </contextlist>
-<compatibility>Available in 2.3.6 and later</compatibility>
+<compatibility>Available in 2.3.6 and later. Not existent file paths without wildcards
+               do not cause SyntaxError after 2.4.30</compatibility>
 
 <usage>
     <p>This directive allows inclusion of other configuration files
     from within the server configuration files. It works identically to the
-    <directive module="core">Include</directive> directive, with the
-    exception that if wildcards do not match any file or directory, the
-    <directive module="core">IncludeOptional</directive> directive will be
-    silently ignored instead of causing an error.</p>
+    <directive module="core">Include</directive> directive, but it will be
+    silently ignored (instead of causing an error) if wildcards are used and
+    they do not match any file or directory or if a file path does not exist
+    on the file system.</p>
 </usage>
 
 <seealso><directive module="core">Include</directive></seealso>
diff --git a/server/config.c b/server/config.c
index 983c7dfae3..30bd6d66bd 100644
--- a/server/config.c
+++ b/server/config.c
@@ -1951,6 +1951,15 @@ static const char *process_resource_config_nofnmatch(server_rec *s,
 
         return NULL;
     }
+    else if (optional) {
+        /* If the optinal flag is set (like for IncludeOptional) we can
+         * tolerate that no file or directory is present and bail out.
+         */
+        apr_finfo_t finfo;
+        if (apr_stat(&finfo, fname, APR_FINFO_TYPE, ptemp) != APR_SUCCESS
+            || finfo.filetype == APR_NOFILE)
+            return NULL;
+    }
 
     return ap_process_resource_config(s, fname, conftree, p, ptemp);
 }
@@ -2001,6 +2010,12 @@ static const char *process_resource_config_fnmatch(server_rec *s,
      */
     rv = apr_dir_open(&dirp, path, ptemp);
     if (rv != APR_SUCCESS) {
+        /* If the directory doesn't exist and the optional flag is set
+         * there is no need to return an error.
+         */
+        if (rv == APR_ENOENT && optional) {
+            return NULL;
+        }
         return apr_psprintf(p, "Could not open config directory %s: %pm",
                             path, &rv);
     }