1 files changed, 27 insertions, 0 deletions
diff --git a/src/libs6/s6_accessrules_keycheck_reversedns.c b/src/libs6/s6_accessrules_keycheck_reversedns.c
new file mode 100644
index 0000000..00d7e21
--- /dev/null
+++ b/src/libs6/s6_accessrules_keycheck_reversedns.c
@@ -0,0 +1,27 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <skalibs/bytestr.h>
+#include <s6/accessrules.h>
+
+s6_accessrules_result_t s6_accessrules_keycheck_reversedns (void const *key, void *data, s6_accessrules_params_t *params, s6_accessrules_backend_func_t_ref check1)
+{
+  char const *name = key ;
+  unsigned int len = str_len(name) ;
+  if (!len) return (errno = EINVAL, S6_ACCESSRULES_ERROR) ;
+  if (name[len-1] == '.') len-- ;
+  {
+    unsigned int i = 0 ;
+    char tmp[len + 11] ;
+    byte_copy(tmp, 11, "reversedns/") ;
+    while (i < len)
+    {
+      register s6_accessrules_result_t r ;
+      byte_copy(tmp+11, len-i, name+i) ;
+      r = (*check1)(tmp, 11+len-i, data, params) ;
+      if (r != S6_ACCESSRULES_NOTFOUND) return r ;
+      i += byte_chr(name+i, len-i, '.') + 1 ;
+    }
+  }
+  return (*check1)("reversedns/@", 12, data, params) ;
+}