lib/fuzzing/fuzz_nmblib_parse_packet.c

   1 /*
   2   Fuzz NMB parse_packet
   3   Copyright (C) Catalyst IT 2020
   4
   5   This program is free software; you can redistribute it and/or modify
   6   it under the terms of the GNU General Public License as published by
   7   the Free Software Foundation; either version 3 of the License, or
   8   (at your option) any later version.
   9
  10   This program is distributed in the hope that it will be useful,
  11   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13   GNU General Public License for more details.
  14
  15   You should have received a copy of the GNU General Public License
  16   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include "../../source3/include/includes.h"
  20 #include "libsmb/libsmb.h"
  21 #include "libsmb/nmblib.h"
  22 #include "fuzzing/fuzzing.h"
  23
  24 #define PORT 138
  25 #define MAX_LENGTH (1024 * 1024)
  26 char buf[MAX_LENGTH + 1];
  27
  28
  29 int LLVMFuzzerTestOneInput(const uint8_t *input, size_t len)
  30 {
  31         struct packet_struct *p = NULL;
  32         struct in_addr ip = {
  33                 0x0100007f /* 127.0.0.1 */
  34         };
  35
  36         p = parse_packet((char *)input,
  37                          len,
  38                          NMB_PACKET,
  39                          ip,
  40                          PORT);
  41         /*
  42          * We expect NULL (parse failure) most of the time.
  43          *
  44          * When it is not NULL we want to ensure the parsed packet is
  45          * reasonably sound.
  46          */
  47
  48         if (p != NULL) {
  49                 struct nmb_packet *nmb = &p->packet.nmb;
  50                 pull_ascii_nstring(buf, MAX_LENGTH,
  51                                    nmb->question.question_name.name);
  52                 build_packet(buf, MAX_LENGTH, p);
  53                 free_packet(p);
  54         }
  55         return 0;
  56 }
  57
  58
  59 int LLVMFuzzerInitialize(int *argc, char ***argv)
  60 {
  61         return 0;
  62 }