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

   1 #include "tdb2-source.h"
   2 #include "tap-interface.h"
   3 #include <stdlib.h>
   4 #include <err.h>
   5 #include "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 tdb_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->file->map_ptr)
  32                 ((unsigned char *)tdb->file->map_ptr)[off] ^= mask;
  33         else {
  34                 unsigned char c;
  35                 if (pread(tdb->file->fd, &c, 1, off) != 1)
  36                         err(1, "pread");
  37                 c ^= mask;
  38                 if (pwrite(tdb->file->fd, &c, 1, off) != 1)
  39                         err(1, "pwrite");
  40         }
  41 }
  42
  43 static void check_test(struct tdb_context *tdb)
  44 {
  45         TDB_DATA key, data;
  46         unsigned int i, verifiable, corrupt, sizes[2], dsize, ksize;
  47
  48         ok1(tdb_check(tdb, NULL, NULL) == TDB_SUCCESS);
  49
  50         key = tdb_mkdata("hello", strlen("hello"));
  51         data = tdb_mkdata("world", strlen("world"));
  52
  53         /* Key and data size respectively. */
  54         dsize = ksize = 0;
  55
  56         /* 5 keys in hash size 2 means we'll have multichains. */
  57         for (key.dsize = 1; key.dsize <= 5; key.dsize++) {
  58                 ksize += key.dsize;
  59                 dsize += data.dsize;
  60                 if (tdb_store(tdb, key, data, TDB_INSERT) != TDB_SUCCESS)
  61                         abort();
  62         }
  63
  64         /* This is how many bytes we expect to be verifiable. */
  65         /* From the file header. */
  66         verifiable = strlen(TDB_MAGIC_FOOD) + 1
  67                 + 2 * sizeof(uint32_t) + 2 * sizeof(tdb1_off_t)
  68                 + 2 * sizeof(uint32_t);
  69         /* From the free list chain and hash chains. */
  70         verifiable += 3 * sizeof(tdb1_off_t);
  71         /* From the record headers & tailer */
  72         verifiable += 5 * (sizeof(struct tdb1_record) + sizeof(uint32_t));
  73         /* The free block: we ignore datalen, keylen, full_hash. */
  74         verifiable += sizeof(struct tdb1_record) - 3*sizeof(uint32_t) +
  75                 sizeof(uint32_t);
  76         /* Our check function verifies the key and data. */
  77         verifiable += ksize + dsize;
  78
  79         /* Flip one bit at a time, make sure it detects verifiable bytes. */
  80         for (i = 0, corrupt = 0; i < tdb->file->map_size * CHAR_BIT; i++) {
  81                 tdb1_flip_bit(tdb, i);
  82                 memset(sizes, 0, sizeof(sizes));
  83                 if (tdb_check(tdb, check, sizes) == TDB_ERR_CORRUPT)
  84                         corrupt++;
  85                 else if (sizes[0] != ksize || sizes[1] != dsize)
  86                         corrupt++;
  87                 tdb1_flip_bit(tdb, i);
  88         }
  89         ok(corrupt == verifiable * CHAR_BIT, "corrupt %u should be %u",
  90            corrupt, verifiable * CHAR_BIT);
  91 }
  92
  93 int main(int argc, char *argv[])
  94 {
  95         struct tdb_context *tdb;
  96         union tdb_attribute hsize;
  97
  98         hsize.base.attr = TDB_ATTRIBUTE_TDB1_HASHSIZE;
  99         hsize.base.next = &tap_log_attr;
 100         hsize.tdb1_hashsize.hsize = 2;
 101
 102         plan_tests(4);
 103         /* This should use mmap. */
 104         tdb = tdb_open("run-corrupt.tdb1", TDB_VERSION1,
 105                        O_CREAT|O_TRUNC|O_RDWR, 0600, &hsize);
 106
 107         if (!tdb)
 108                 abort();
 109         check_test(tdb);
 110         tdb_close(tdb);
 111
 112         /* This should not. */
 113         tdb = tdb_open("run-corrupt.tdb1", TDB_VERSION1|TDB_NOMMAP,
 114                        O_CREAT|O_TRUNC|O_RDWR, 0600, &hsize);
 115
 116         if (!tdb)
 117                 abort();
 118         check_test(tdb);
 119         tdb_close(tdb);
 120
 121         return exit_status();
 122 }