lib/tdb/test/run-corrupt.c

   1 #include "../common/tdb_private.h"
   2 #include "../common/io.c"
   3 #include "../common/tdb.c"
   4 #include "../common/lock.c"
   5 #include "../common/freelist.c"
   6 #include "../common/traverse.c"
   7 #include "../common/transaction.c"
   8 #include "../common/error.c"
   9 #include "../common/open.c"
  10 #include "../common/check.c"
  11 #include "../common/hash.c"
  12 #include "tap-interface.h"
  13 #include <stdlib.h>
  14 #include "logging.h"
  15
  16 static int check(TDB_DATA key, TDB_DATA data, void *private)
  17 {
  18         unsigned int *sizes = private;
  19
  20         if (key.dsize > strlen("hello"))
  21                 return -1;
  22         if (memcmp(key.dptr, "hello", key.dsize) != 0)
  23                 return -1;
  24
  25         if (data.dsize != strlen("world"))
  26                 return -1;
  27         if (memcmp(data.dptr, "world", data.dsize) != 0)
  28                 return -1;
  29
  30         sizes[0] += key.dsize;
  31         sizes[1] += data.dsize;
  32         return 0;
  33 }
  34
  35 static void tdb_flip_bit(struct tdb_context *tdb, unsigned int bit)
  36 {
  37         unsigned int off = bit / CHAR_BIT;
  38         unsigned char mask = (1 << (bit % CHAR_BIT));
  39
  40         if (tdb->map_ptr)
  41                 ((unsigned char *)tdb->map_ptr)[off] ^= mask;
  42         else {
  43                 unsigned char c;
  44                 if (pread(tdb->fd, &c, 1, off) != 1) {
  45                         fprintf(stderr, "pread: %s\n", strerror(errno));
  46                         exit(1);
  47                 }
  48                 c ^= mask;
  49                 if (pwrite(tdb->fd, &c, 1, off) != 1) {
  50                         fprintf(stderr, "pwrite: %s\n", strerror(errno));
  51                         exit(1);
  52                 }
  53         }
  54 }
  55
  56 static void check_test(struct tdb_context *tdb)
  57 {
  58         TDB_DATA key, data;
  59         unsigned int i, verifiable, corrupt, sizes[2], dsize, ksize;
  60
  61         ok1(tdb_check(tdb, NULL, NULL) == 0);
  62
  63         key.dptr = (void *)"hello";
  64         data.dsize = strlen("world");
  65         data.dptr = (void *)"world";
  66
  67         /* Key and data size respectively. */
  68         dsize = ksize = 0;
  69
  70         /* 5 keys in hash size 2 means we'll have multichains. */
  71         for (key.dsize = 1; key.dsize <= 5; key.dsize++) {
  72                 ksize += key.dsize;
  73                 dsize += data.dsize;
  74                 if (tdb_store(tdb, key, data, TDB_INSERT) != 0)
  75                         abort();
  76         }
  77
  78         /* This is how many bytes we expect to be verifiable. */
  79         /* From the file header. */
  80         verifiable = strlen(TDB_MAGIC_FOOD) + 1
  81                 + 2 * sizeof(uint32_t) + 2 * sizeof(tdb_off_t)
  82                 + 2 * sizeof(uint32_t);
  83         /* From the free list chain and hash chains. */
  84         verifiable += 3 * sizeof(tdb_off_t);
  85         /* From the record headers & tailer */
  86         verifiable += 5 * (sizeof(struct tdb_record) + sizeof(uint32_t));
  87         /* The free block: we ignore datalen, keylen, full_hash. */
  88         verifiable += sizeof(struct tdb_record) - 3*sizeof(uint32_t) +
  89                 sizeof(uint32_t);
  90         /* Our check function verifies the key and data. */
  91         verifiable += ksize + dsize;
  92
  93         /* Flip one bit at a time, make sure it detects verifiable bytes. */
  94         for (i = 0, corrupt = 0; i < tdb->map_size * CHAR_BIT; i++) {
  95                 tdb_flip_bit(tdb, i);
  96                 memset(sizes, 0, sizeof(sizes));
  97                 if (tdb_check(tdb, check, sizes) != 0)
  98                         corrupt++;
  99                 else if (sizes[0] != ksize || sizes[1] != dsize)
 100                         corrupt++;
 101                 tdb_flip_bit(tdb, i);
 102         }
 103         ok(corrupt == verifiable * CHAR_BIT, "corrupt %u should be %u",
 104            corrupt, verifiable * CHAR_BIT);
 105 }
 106
 107 int main(int argc, char *argv[])
 108 {
 109         struct tdb_context *tdb;
 110
 111         plan_tests(4);
 112         /* This should use mmap. */
 113         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST,
 114                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 115
 116         if (!tdb)
 117                 abort();
 118         check_test(tdb);
 119         tdb_close(tdb);
 120
 121         /* This should not. */
 122         tdb = tdb_open_ex("run-corrupt.tdb", 2, TDB_CLEAR_IF_FIRST|TDB_NOMMAP,
 123                           O_CREAT|O_TRUNC|O_RDWR, 0600, &taplogctx, NULL);
 124
 125         if (!tdb)
 126                 abort();
 127         check_test(tdb);
 128         tdb_close(tdb);
 129
 130         return exit_status();
 131 }