1 files changed, 77 insertions, 0 deletions
diff --git a/src/transport_index.c b/src/transport_index.c
new file mode 100644
index 0000000..b21b6e2
--- /dev/null
+++ b/src/transport_index.c
@@ -0,0 +1,77 @@
+/*
+ * 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 "transport_index.h"
+
+/*
+ * This is very similar to ip_proto_index, but this
+ * indexer is applied only for DNS messages, rather than
+ * all IP packets.
+ */
+
+#include "md_array.h"
+
+#define LARGEST 2
+
+int transport_indexer(const dns_message* m)
+{
+    if (IPPROTO_UDP == m->tm->proto)
+        return 0;
+    if (IPPROTO_TCP == m->tm->proto)
+        return 1;
+    return LARGEST;
+}
+
+static int next_iter = 0;
+
+int transport_iterator(const char** label)
+{
+    if (NULL == label) {
+        next_iter = 0;
+        return LARGEST + 1;
+    }
+    if (0 == next_iter)
+        *label = "udp";
+    else if (1 == next_iter)
+        *label = "tcp";
+    else if (LARGEST == next_iter)
+        *label = "else";
+    else
+        return -1;
+    return next_iter++;
+}