lib/tdb/test/run-corrupt.c

   1 #define _XOPEN_SOURCE 500
   2 #include "../common/tdb_private.h"
   3 #include "../common/io.c"
   4 #include "../common/tdb.c"
   5 #include "../common/lock.c"
   6 #include "../common/freelist.c"
   7 #include "../common/traverse.c"
   8 #include "../common/transaction.c"
   9 #include "../common/error.c"
  10 #include "../common/open.c"
  11 #include "../common/check.c"
  12 #include "../common/hash.c"
  13 #include "tap-interface.h"
  14 #include <stdlib.h>
  15 #include <err.h>
  16 #include "logging.h"
  17
  18 static int check(TDB_DATA key, TDB_DATA data, void *private)
  19 {
  20         unsigned int *sizes = private;
  21
  22         if (key.dsize > strlen("hello"))
  23                 return -1;
  24         if (memcmp(key.dptr, "hello", key.dsize) != 0)
  25                 return -1;
  26
  27         if (data.dsize != strlen("world"))
  28                 return -1;
  29         if (memcmp(data.dptr, "world", data.dsize) != 0)
  30                 return -1;
  31
  32         sizes[0] += key.dsize;
  33         sizes[1] += data.dsize;
  34         return 0;
  35 }
  36
  37 static void tdb_flip_bit(struct tdb_context *tdb, unsigned int bit)
  38 {
  39         unsigned int off = bit / CHAR_BIT;
  40         unsigned char mask = (1 << (bit % CHAR_BIT));
  41
  42         if (tdb->map_ptr)
  43                 ((unsigned char *)tdb->map_ptr)[off] ^= mask;
  44         else {
  45                 unsigned char c;
  46                 if (pread(tdb->fd, &c, 1, off) != 1)
  47                         err(1, "pread");
  48                 c ^= mask;
  49                 if (pwrite(tdb->fd, &c, 1, off) != 1)
  50                         err(1, "pwrite");
  51         }
  52 }
  53
  54 static void check_test(struct tdb_context *tdb)
  55 {
  56         TDB_DATA key, data;
  57         unsigned int i, verifiable, corrupt, sizes[2], dsize, ksize;
  58
  59         ok1(tdb_check(tdb, NULL, NULL) == 0);
  60
  61         key.dptr = (void *)"hello";
  62         data.dsize = strlen("world");
  63         data.dptr = (void *)"world";
  64
  65         /* Key and data size respectively. */
  66         dsize = ksize = 0;
  67
  68         /* 5 keys in hash size 2 means we'll have multichains. */
  69         for (key.dsize = 1; key.dsize <= 5; key.dsize++) {
  70                 ksize += key.dsize;
  71                 dsize += data.dsize;
  72                 if (tdb_store(tdb, key, data, TDB_INSERT) != 0)
  73                         abort();
  74         }
  75
  76         /* This is how many bytes we expect to be verifiable. */
  77         /* From the file header. */
  78         verifiable = strlen(TDB_MAGIC_FOOD) + 1
  79                 + 2 * sizeof(uint32_t) + 2 * sizeof(tdb_off_t)
  80                 + 2 * sizeof(uint32_t);
  81         /* From the free list chain and hash chains. */
  82         verifiable += 3 * sizeof(tdb_off_t);
  83         /* From the record headers & tailer */
  84         verifiable += 5 * (sizeof(struct tdb_record) + sizeof(uint32_t));
  85         /* The free block: we ignore datalen, keylen, full_hash. */
  86         verifiable += sizeof(struct tdb_record) - 3*sizeof(uint32_t) +
  87                 sizeof(uint32_t);
  88         /* Our check function verifies the key and data. */
  89         verifiable += ksize + dsize;
  90
  91         /* Flip one bit at a time, make sure it detects verifiable bytes. */
  92         for (i = 0, corrupt = 0; i < tdb->map_size * CHAR_BIT; i++) {
  93                 tdb_flip_bit(tdb, i);
  94                 memset(sizes, 0, sizeof(sizes));
  95                 if (tdb_check(tdb, check, sizes) != 0)
  96                         corrupt++;
  97                 else if (sizes[0] != ksize || sizes[1] != dsize)
  98                         corrupt++;
  99                 tdb_flip_bit(tdb, i);
 100         }
 101         ok(corrupt == verifiable * CHAR_BIT, "corrupt %u should be %u",
 102            corrupt, verifiable * CHAR_BIT);
 103 }
 104
 105 int main(int argc, char *argv[])
 106 {
 107         struct tdb_context *tdb;
 108
 109         plan_tests(4);
 110         /* This should use mmap. */
 111         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST,
 112                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 113
 114         if (!tdb)
 115                 abort();
 116         check_test(tdb);
 117         tdb_close(tdb);
 118
 119         /* This should not. */
 120         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST|TDB_NOMMAP,
 121                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 122
 123         if (!tdb)
 124                 abort();
 125         check_test(tdb);
 126         tdb_close(tdb);
 127
 128         return exit_status();
 129 }