src/test/fuzz/fuzz_diff.c

   1 /* Copyright (c) 2016-2021, The Tor Project, Inc. */
   2 /* See LICENSE for licensing information */
   3
   4 #define CONSDIFF_PRIVATE
   5
   6 #include "orconfig.h"
   7 #include "core/or/or.h"
   8 #include "feature/dircommon/consdiff.h"
   9
  10 #include "test/fuzz/fuzzing.h"
  11
  12 static int
  13 mock_consensus_compute_digest_(const char *c, size_t len,
  14                                consensus_digest_t *d)
  15 {
  16   (void)c;
  17   (void)len;
  18   memset(d->sha3_256, 3, sizeof(d->sha3_256));
  19   return 0;
  20 }
  21
  22 int
  23 fuzz_init(void)
  24 {
  25   MOCK(consensus_compute_digest, mock_consensus_compute_digest_);
  26   MOCK(consensus_compute_digest_as_signed, mock_consensus_compute_digest_);
  27   return 0;
  28 }
  29
  30 int
  31 fuzz_cleanup(void)
  32 {
  33   UNMOCK(consensus_compute_digest);
  34   UNMOCK(consensus_compute_digest_as_signed);
  35   return 0;
  36 }
  37
  38 int
  39 fuzz_main(const uint8_t *stdin_buf, size_t data_size)
  40 {
  41 #define SEP "=====\n"
  42 #define SEPLEN strlen(SEP)
  43   const uint8_t *separator = tor_memmem(stdin_buf, data_size, SEP, SEPLEN);
  44   if (! separator)
  45     return 0;
  46   size_t c1_len = separator - stdin_buf;
  47   const char *c1 = (const char *)stdin_buf;
  48   size_t c2_len = data_size - c1_len - SEPLEN;
  49   const char *c2 = (const char *)separator + SEPLEN;
  50
  51   const char *cp = memchr(c1, 0, c1_len);
  52   if (cp)
  53     c1_len = cp - c1;
  54
  55   cp = memchr(c2, 0, c2_len);
  56   if (cp)
  57     c2_len = cp - c2;
  58
  59   char *c3 = consensus_diff_generate(c1, c1_len, c2, c2_len);
  60
  61   if (c3) {
  62     char *c4 = consensus_diff_apply(c1, c1_len, c3, strlen(c3));
  63     tor_assert(c4);
  64     int equal = (c2_len == strlen(c4)) && fast_memeq(c2, c4, c2_len);
  65     if (! equal) {
  66       //printf("%s\n", escaped(c1));
  67       //printf("%s\n", escaped(c2));
  68       printf("%s\n", escaped(c3));
  69       printf("%s\n", escaped(c4));
  70     }
  71     tor_assert(equal);
  72     tor_free(c3);
  73     tor_free(c4);
  74   }
  75
  76   return 0;
  77 }