lib/tdb2/test/run-tdb1-corrupt.c

   1 #include "tdb2-source.h"
   2 #include <ccan/tap/tap.h>
   3 #include <stdlib.h>
   4 #include <err.h>
   5 #include "tdb1-logging.h"
   6
   7 static int check(TDB_DATA key, TDB_DATA data, void *private)
   8 {
   9         unsigned int *sizes = private;
  10
  11         if (key.dsize > strlen("hello"))
  12                 return -1;
  13         if (memcmp(key.dptr, "hello", key.dsize) != 0)
  14                 return -1;
  15
  16         if (data.dsize != strlen("world"))
  17                 return -1;
  18         if (memcmp(data.dptr, "world", data.dsize) != 0)
  19                 return -1;
  20
  21         sizes[0] += key.dsize;
  22         sizes[1] += data.dsize;
  23         return 0;
  24 }
  25
  26 static void tdb1_flip_bit(struct tdb1_context *tdb, unsigned int bit)
  27 {
  28         unsigned int off = bit / CHAR_BIT;
  29         unsigned char mask = (1 << (bit % CHAR_BIT));
  30
  31         if (tdb->map_ptr)
  32                 ((unsigned char *)tdb->map_ptr)[off] ^= mask;
  33         else {
  34                 unsigned char c;
  35                 if (pread(tdb->fd, &c, 1, off) != 1)
  36                         err(1, "pread");
  37                 c ^= mask;
  38                 if (pwrite(tdb->fd, &c, 1, off) != 1)
  39                         err(1, "pwrite");
  40         }
  41 }
  42
  43 static void check_test(struct tdb1_context *tdb)
  44 {
  45         TDB_DATA key, data;
  46         unsigned int i, verifiable, corrupt, sizes[2], dsize, ksize;
  47
  48         ok1(tdb1_check(tdb, NULL, NULL) == 0);
  49
  50         key.dptr = (void *)"hello";
  51         data.dsize = strlen("world");
  52         data.dptr = (void *)"world";
  53
  54         /* Key and data size respectively. */
  55         dsize = ksize = 0;
  56
  57         /* 5 keys in hash size 2 means we'll have multichains. */
  58         for (key.dsize = 1; key.dsize <= 5; key.dsize++) {
  59                 ksize += key.dsize;
  60                 dsize += data.dsize;
  61                 if (tdb1_store(tdb, key, data, TDB_INSERT) != 0)
  62                         abort();
  63         }
  64
  65         /* This is how many bytes we expect to be verifiable. */
  66         /* From the file header. */
  67         verifiable = strlen(TDB_MAGIC_FOOD) + 1
  68                 + 2 * sizeof(uint32_t) + 2 * sizeof(tdb1_off_t)
  69                 + 2 * sizeof(uint32_t);
  70         /* From the free list chain and hash chains. */
  71         verifiable += 3 * sizeof(tdb1_off_t);
  72         /* From the record headers & tailer */
  73         verifiable += 5 * (sizeof(struct tdb1_record) + sizeof(uint32_t));
  74         /* The free block: we ignore datalen, keylen, full_hash. */
  75         verifiable += sizeof(struct tdb1_record) - 3*sizeof(uint32_t) +
  76                 sizeof(uint32_t);
  77         /* Our check function verifies the key and data. */
  78         verifiable += ksize + dsize;
  79
  80         /* Flip one bit at a time, make sure it detects verifiable bytes. */
  81         for (i = 0, corrupt = 0; i < tdb->map_size * CHAR_BIT; i++) {
  82                 tdb1_flip_bit(tdb, i);
  83                 memset(sizes, 0, sizeof(sizes));
  84                 if (tdb1_check(tdb, check, sizes) != 0)
  85                         corrupt++;
  86                 else if (sizes[0] != ksize || sizes[1] != dsize)
  87                         corrupt++;
  88                 tdb1_flip_bit(tdb, i);
  89         }
  90         ok(corrupt == verifiable * CHAR_BIT, "corrupt %u should be %u",
  91            corrupt, verifiable * CHAR_BIT);
  92 }
  93
  94 int main(int argc, char *argv[])
  95 {
  96         struct tdb1_context *tdb;
  97
  98         plan_tests(4);
  99         /* This should use mmap. */
 100         tdb = tdb1_open_ex("run-corrupt.tdb", 2, TDB1_CLEAR_IF_FIRST,
 101                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 102
 103         if (!tdb)
 104                 abort();
 105         check_test(tdb);
 106         tdb1_close(tdb);
 107
 108         /* This should not. */
 109         tdb = tdb1_open_ex("run-corrupt.tdb", 2, TDB1_CLEAR_IF_FIRST|TDB1_NOMMAP,
 110                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 111
 112         if (!tdb)
 113                 abort();
 114         check_test(tdb);
 115         tdb1_close(tdb);
 116
 117         return exit_status();
 118 }