1 files changed, 45 insertions, 0 deletions
diff --git a/projects/net-snmp/snmp_parse_fuzzer.c b/projects/net-snmp/snmp_parse_fuzzer.c
new file mode 100644
index 00000000..bc247f58
--- /dev/null
+++ b/projects/net-snmp/snmp_parse_fuzzer.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This fuzzer exercises the SNMP PDU parsing code, including ASN.1.
+ */
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+int LLVMFuzzerInitialize(int *argc, char ***argv) {
+    if (getenv("NETSNMP_DEBUGGING") != NULL) {
+        /*
+         * Turn on all debugging, to help understand what
+         * bits of the parser are running.
+         */
+        snmp_enable_stderrlog();
+        snmp_set_do_debugging(1);
+        debug_register_tokens("");
+    }
+    return 0;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+    size_t bytes_remaining = size;
+    netsnmp_pdu *pdu = SNMP_MALLOC_TYPEDEF(netsnmp_pdu);
+
+    netsnmp_session sess = { };
+    snmpv3_parse(pdu, (unsigned char *)data, &bytes_remaining, NULL, &sess);
+    snmp_free_pdu(pdu);
+    return 0;
+}