1 /*
2 * Copyright 2018 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * This fuzzer exercises the SNMP PDU parsing code, including ASN.1.
17 */
18 #include <net-snmp/net-snmp-config.h>
19 #include <net-snmp/net-snmp-includes.h>
20 #include <stddef.h>
21 #include <stdint.h>
22 #include <stdlib.h>
23
LLVMFuzzerInitialize(int * argc,char *** argv)24 int LLVMFuzzerInitialize(int *argc, char ***argv) {
25 if (getenv("NETSNMP_DEBUGGING") != NULL) {
26 /*
27 * Turn on all debugging, to help understand what
28 * bits of the parser are running.
29 */
30 snmp_enable_stderrlog();
31 snmp_set_do_debugging(1);
32 debug_register_tokens("");
33 }
34 return 0;
35 }
36
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)37 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
38 size_t bytes_remaining = size;
39 netsnmp_pdu *pdu = SNMP_MALLOC_TYPEDEF(netsnmp_pdu);
40
41 snmp_pdu_parse(pdu, (unsigned char *)data, &bytes_remaining);
42 snmp_free_pdu(pdu);
43 return 0;
44 }
45