add support for (Free)BSD extended attributes

enable with `./configure --with-attr` and `mimetype.use-xattr =
"enable"` in the config.

set attribute with:

    setextattr user Content-Type text/plain path/to/www/file

From: Moritz Wilhelmy <mw@barfooze.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2966 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -7,6 +7,7 @@ NEWS
   * use keep-alive timeout while waiting for HTTP headers; use always the read timeout while waiting for the HTTP body
   * fix bad shift in conditional netmask ".../0" handling
   * add more mime types and a script to generate mime.conf (fixes #2579)
+  * add support for (Free)BSD extended attributes
 
 - 1.4.35 - 2014-03-12
   * [network/ssl] fix build error if TLSEXT is disabled

configure.ac

@@ -218,14 +218,23 @@ AC_ARG_WITH(attr, AC_HELP_STRING([--with-attr],[enable extended attribute suppor
 [WITH_ATTR=$withval],[WITH_ATTR=no])
 AC_MSG_RESULT($withval)
 if test "$WITH_ATTR" != "no"; then
- AC_CHECK_LIB(attr, attr_get, [
-	AC_CHECK_HEADERS([attr/attributes.h],[
-		ATTR_LIB=-lattr
-		AC_DEFINE([HAVE_XATTR], [1], [libattr])
-		AC_DEFINE([HAVE_ATTR_ATTRIBUTES_H], [1])
-	])
- ])
- AC_SUBST(ATTR_LIB)
+  # libattr (linux only?)
+  AC_CHECK_LIB(attr, attr_get, [
+    AC_CHECK_HEADERS([attr/attributes.h],[
+      ATTR_LIB=-lattr
+      AC_DEFINE([HAVE_XATTR], [1], [libattr])
+      AC_DEFINE([HAVE_ATTR_ATTRIBUTES_H], [1])
+    ])
+  ])
+  AC_SUBST(ATTR_LIB)
+
+  # (Free)BSD extattr
+  AC_CHECK_FUNC([extattr_get_file], [
+    AC_CHECK_HEADERS([sys/extattr.h],[
+      AC_DEFINE([HAVE_EXTATTR], [1], [BSD extended attributes])
+      AC_DEFINE([HAVE_SYS_EXTATTR_H], [1])
+    ])
+  ])
 fi
 
 dnl openssl on solaris needs -lsocket -lnsl

src/mod_dirlisting.c

@@ -31,6 +31,10 @@
 #include <attr/attributes.h>
 #endif
 
+#ifdef HAVE_SYS_EXTATTR_H
+#include <sys/extattr.h>
+#endif
+
 #include "version.h"
 
 /* plugin config for all request/connections */
@@ -644,7 +648,7 @@ static int http_list_directory(server *srv, connection *con, plugin_data *p, buf
 	size_t k;
 	const char *content_type;
 	long name_max;
-#ifdef HAVE_XATTR
+#if defined(HAVE_XATTR) || defined(HAVE_EXTATTR)
 	char attrval[128];
 	int attrlen;
 #endif
@@ -820,8 +824,7 @@ static int http_list_directory(server *srv, connection *con, plugin_data *p, buf
 		tmp = files.ent[i];
 
 		content_type = NULL;
-#ifdef HAVE_XATTR
-
+#if defined(HAVE_XATTR)
 		if (con->conf.use_xattr) {
 			memcpy(path_file, DIRLIST_ENT_NAME(tmp), tmp->namelen + 1);
 			attrlen = sizeof(attrval) - 1;
@@ -830,6 +833,14 @@ static int http_list_directory(server *srv, connection *con, plugin_data *p, buf
 				content_type = attrval;
 			}
 		}
+#elif defined(HAVE_EXTATTR)
+		if (con->conf.use_xattr) {
+			memcpy(path_file, DIRLIST_ENT_NAME(tmp), tmp->namelen + 1);
+			if(-1 != (attrlen = extattr_get_file(path, EXTATTR_NAMESPACE_USER, "Content-Type", attrval, sizeof(attrval)-1))) {
+				attrval[attrlen] = '\0';
+				content_type = attrval;
+			}
+		}
 #endif
 
 		if (content_type == NULL) {

src/stat_cache.c

@@ -18,6 +18,10 @@
 # include <attr/attributes.h>
 #endif
 
+#ifdef HAVE_SYS_EXTATTR_H
+# include <sys/extattr.h>
+#endif
+
 #ifdef HAVE_FAM_H
 # include <fam.h>
 #endif
@@ -210,7 +214,7 @@ void stat_cache_free(stat_cache *sc) {
 	free(sc);
 }
 
-#ifdef HAVE_XATTR
+#if defined(HAVE_XATTR)
 static int stat_cache_attr_get(buffer *buf, char *name) {
 	int attrlen;
 	int ret;
@@ -224,6 +228,19 @@ static int stat_cache_attr_get(buffer *buf, char *name) {
 	}
 	return ret;
 }
+#elif defined(HAVE_EXTATTR)
+static int stat_cache_attr_get(buffer *buf, char *name) {
+	ssize_t attrlen = 1024;
+
+	buffer_prepare_copy(buf, attrlen);
+
+	if (-1 != (attrlen = extattr_get_file(name, EXTATTR_NAMESPACE_USER, "Content-Type", buf->ptr, attrlen-1))) {
+		buf->used = attrlen + 1;
+		buf->ptr[attrlen] = '\0';
+		return 0;
+	}
+	return -1;
+}
 #endif
 
 /* the famous DJB hash function for strings */
@@ -592,7 +609,7 @@ handler_t stat_cache_get_entry(server *srv, connection *con, buffer *name, stat_
 	if (S_ISREG(st.st_mode)) {
 		/* determine mimetype */
 		buffer_reset(sce->content_type);
-#ifdef HAVE_XATTR
+#if defined(HAVE_XATTR) || defined(HAVE_EXTATTR)
 		if (con->conf.use_xattr) {
 			stat_cache_attr_get(sce->content_type, name->ptr);
 		}