1 files changed, 73 insertions, 0 deletions
diff --git a/src/edns_bufsiz_index.c b/src/edns_bufsiz_index.c
new file mode 100644
index 0000000..7f8f056
--- /dev/null
+++ b/src/edns_bufsiz_index.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2008-2024 OARC, Inc.
+ * Copyright (c) 2007-2008, Internet Systems Consortium, Inc.
+ * Copyright (c) 2003-2007, The Measurement Factory, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "edns_bufsiz_index.h"
+
+int edns_bufsiz_max = 0;
+
+int edns_bufsiz_indexer(const dns_message* m)
+{
+    int index;
+    if (m->malformed)
+        return -1;
+    if (0 == m->edns.found)
+        return 0;
+    index = (int)(m->edns.bufsiz >> 9) + 1;
+    if (index > edns_bufsiz_max)
+        edns_bufsiz_max = index;
+    return index;
+}
+
+int edns_bufsiz_iterator(const char** label)
+{
+    static int  next_iter = 0;
+    static char buf[20];
+    if (NULL == label) {
+        next_iter = 0;
+        return 0;
+    }
+    if (next_iter > edns_bufsiz_max) {
+        return -1;
+    } else if (0 == next_iter) {
+        *label = "None";
+    } else {
+        snprintf(buf, sizeof(buf), "%d-%d", (next_iter - 1) << 9, (next_iter << 9) - 1);
+        *label = buf;
+    }
+    return next_iter++;
+}