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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/* dbus-break-loader.c Program to find byte streams that break the message loader
*
* Copyright (C) 2003 Red Hat Inc.
*
* Licensed under the Academic Free License version 2.1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <config.h>
#include <dbus/dbus.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/wait.h>
#include <string.h>
#define DBUS_COMPILATION
#include <dbus/dbus-string.h>
#include <dbus/dbus-internals.h>
#include <dbus/dbus-test.h>
#include <dbus/dbus-marshal-basic.h>
#undef DBUS_COMPILATION
static DBusString failure_dir;
static int total_attempts;
static int failures_this_iteration;
static int
random_int_in_range (int start,
int end)
{
/* such elegant math */
double gap;
double v_double;
int v;
if (start == end)
return start;
_dbus_assert (end > start);
gap = end - start - 1; /* -1 to not include "end" */
v_double = ((double)start) + (((double)rand ())/RAND_MAX) * gap;
if (v_double < 0.0)
v = (v_double - 0.5);
else
v = (v_double + 0.5);
if (v < start)
{
fprintf (stderr, "random_int_in_range() generated %d for range [%d,%d)\n",
v, start, end);
v = start;
}
else if (v >= end)
{
fprintf (stderr, "random_int_in_range() generated %d for range [%d,%d)\n",
v, start, end);
v = end - 1;
}
/* printf (" %d of [%d,%d)\n", v, start, end); */
return v;
}
static dbus_bool_t
try_mutated_data (const DBusString *data)
{
int pid;
total_attempts += 1;
/* printf (" attempt %d\n", total_attempts); */
pid = fork ();
if (pid < 0)
{
fprintf (stderr, "fork() failed: %s\n",
strerror (errno));
exit (1);
return FALSE;
}
if (pid == 0)
{
/* Child, try loading the data */
if (!dbus_internal_do_not_use_try_message_data (data, _DBUS_MESSAGE_UNKNOWN))
exit (1);
else
exit (0);
}
else
{
/* Parent, wait for child */
int status;
DBusString filename;
dbus_bool_t failed;
if (waitpid (pid, &status, 0) < 0)
{
fprintf (stderr, "waitpid() failed: %s\n", strerror (errno));
exit (1);
return FALSE;
}
failed = FALSE;
if (!_dbus_string_init (&filename) ||
!_dbus_string_copy (&failure_dir, 0,
&filename, 0) ||
!_dbus_string_append_byte (&filename, '/'))
{
fprintf (stderr, "out of memory\n");
exit (1);
}
_dbus_string_append_int (&filename, total_attempts);
if (WIFEXITED (status))
{
if (WEXITSTATUS (status) != 0)
{
_dbus_string_append (&filename, "-exited-");
_dbus_string_append_int (&filename, WEXITSTATUS (status));
failed = TRUE;
}
}
else if (WIFSIGNALED (status))
{
_dbus_string_append (&filename, "signaled-");
_dbus_string_append_int (&filename, WTERMSIG (status));
failed = TRUE;
}
if (failed)
{
DBusError error;
_dbus_string_append (&filename, ".message-raw");
printf ("Child failed, writing %s\n", _dbus_string_get_const_data (&filename));
dbus_error_init (&error);
if (!_dbus_string_save_to_file (data, &filename, FALSE, &error))
{
fprintf (stderr, "Failed to save failed message data: %s\n",
error.message);
dbus_error_free (&error);
exit (1); /* so we can see the seed that was printed out */
}
failures_this_iteration += 1;
_dbus_string_free (&filename);
return FALSE;
}
else
{
_dbus_string_free (&filename);
return TRUE;
}
}
_dbus_assert_not_reached ("should not be reached");
return TRUE;
}
static void
randomly_shorten_or_lengthen (const DBusString *orig_data,
DBusString *mutated)
{
int delta;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) == 0)
delta = random_int_in_range (0, 10);
else
delta = random_int_in_range (- _dbus_string_get_length (mutated),
_dbus_string_get_length (mutated) * 3);
if (delta < 0)
_dbus_string_shorten (mutated, - delta);
else if (delta > 0)
{
int i = 0;
i = _dbus_string_get_length (mutated);
if (!_dbus_string_lengthen (mutated, delta))
_dbus_assert_not_reached ("couldn't lengthen string");
while (i < _dbus_string_get_length (mutated))
{
_dbus_string_set_byte (mutated,
i,
random_int_in_range (0, 256));
++i;
}
}
}
static void
randomly_change_one_byte (const DBusString *orig_data,
DBusString *mutated)
{
int i;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) == 0)
return;
i = random_int_in_range (0, _dbus_string_get_length (mutated));
_dbus_string_set_byte (mutated, i,
random_int_in_range (0, 256));
}
static void
randomly_remove_one_byte (const DBusString *orig_data,
DBusString *mutated)
{
int i;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) == 0)
return;
i = random_int_in_range (0, _dbus_string_get_length (mutated));
_dbus_string_delete (mutated, i, 1);
}
static void
randomly_add_one_byte (const DBusString *orig_data,
DBusString *mutated)
{
int i;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
i = random_int_in_range (0, _dbus_string_get_length (mutated));
_dbus_string_insert_bytes (mutated, i, 1,
random_int_in_range (0, 256));
}
static void
randomly_modify_length (const DBusString *orig_data,
DBusString *mutated)
{
int i;
int byte_order;
const char *d;
dbus_uint32_t orig;
int delta;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) < 12)
return;
d = _dbus_string_get_const_data (mutated);
if (!(*d == DBUS_LITTLE_ENDIAN ||
*d == DBUS_BIG_ENDIAN))
return;
byte_order = *d;
i = random_int_in_range (4, _dbus_string_get_length (mutated) - 8);
i = _DBUS_ALIGN_VALUE (i, 4);
orig = _dbus_demarshal_uint32 (mutated, byte_order, i, NULL);
delta = random_int_in_range (-10, 10);
_dbus_marshal_set_uint32 (mutated, byte_order, i,
(unsigned) (orig + delta));
}
static void
randomly_set_extreme_ints (const DBusString *orig_data,
DBusString *mutated)
{
int i;
int byte_order;
const char *d;
dbus_uint32_t orig;
static int which = 0;
unsigned int extreme_ints[] = {
_DBUS_INT_MAX,
_DBUS_UINT_MAX,
_DBUS_INT_MAX - 1,
_DBUS_UINT_MAX - 1,
_DBUS_INT_MAX - 2,
_DBUS_UINT_MAX - 2,
_DBUS_INT_MAX - 17,
_DBUS_UINT_MAX - 17,
_DBUS_INT_MAX / 2,
_DBUS_INT_MAX / 3,
_DBUS_UINT_MAX / 2,
_DBUS_UINT_MAX / 3,
0, 1, 2, 3,
(unsigned int) -1,
(unsigned int) -2,
(unsigned int) -3
};
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) < 12)
return;
d = _dbus_string_get_const_data (mutated);
if (!(*d == DBUS_LITTLE_ENDIAN ||
*d == DBUS_BIG_ENDIAN))
return;
byte_order = *d;
i = random_int_in_range (4, _dbus_string_get_length (mutated) - 8);
i = _DBUS_ALIGN_VALUE (i, 4);
orig = _dbus_demarshal_uint32 (mutated, byte_order, i, NULL);
which = random_int_in_range (0, _DBUS_N_ELEMENTS (extreme_ints));
_dbus_assert (which >= 0);
_dbus_assert (which < _DBUS_N_ELEMENTS (extreme_ints));
_dbus_marshal_set_uint32 (mutated, byte_order, i,
extreme_ints[which]);
}
static int
random_type (void)
{
const char types[] = {
DBUS_TYPE_INVALID,
DBUS_TYPE_NIL,
DBUS_TYPE_BYTE,
DBUS_TYPE_BOOLEAN,
DBUS_TYPE_INT32,
DBUS_TYPE_UINT32,
DBUS_TYPE_INT64,
DBUS_TYPE_UINT64,
DBUS_TYPE_DOUBLE,
DBUS_TYPE_STRING,
DBUS_TYPE_CUSTOM,
DBUS_TYPE_ARRAY,
DBUS_TYPE_DICT,
DBUS_TYPE_OBJECT_PATH
};
_dbus_assert (_DBUS_N_ELEMENTS (types) == DBUS_NUMBER_OF_TYPES + 1);
return types[ random_int_in_range (0, _DBUS_N_ELEMENTS (types)) ];
}
static void
randomly_change_one_type (const DBusString *orig_data,
DBusString *mutated)
{
int i;
int len;
if (orig_data != mutated)
{
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
}
if (_dbus_string_get_length (mutated) == 0)
return;
len = _dbus_string_get_length (mutated);
i = random_int_in_range (0, len);
/* Look for a type starting at a random location,
* and replace with a different type
*/
while (i < len)
{
int b;
b = _dbus_string_get_byte (mutated, i);
if (dbus_type_is_valid (b))
{
_dbus_string_set_byte (mutated, i, random_type ());
return;
}
++i;
}
}
static int times_we_did_each_thing[7] = { 0, };
static void
randomly_do_n_things (const DBusString *orig_data,
DBusString *mutated,
int n)
{
int i;
void (* functions[]) (const DBusString *orig_data,
DBusString *mutated) =
{
randomly_shorten_or_lengthen,
randomly_change_one_byte,
randomly_add_one_byte,
randomly_remove_one_byte,
randomly_modify_length,
randomly_set_extreme_ints,
randomly_change_one_type
};
_dbus_string_set_length (mutated, 0);
if (!_dbus_string_copy (orig_data, 0, mutated, 0))
_dbus_assert_not_reached ("out of mem");
i = 0;
while (i < n)
{
int which;
which = random_int_in_range (0, _DBUS_N_ELEMENTS (functions));
(* functions[which]) (mutated, mutated);
times_we_did_each_thing[which] += 1;
++i;
}
}
static dbus_bool_t
find_breaks_based_on (const DBusString *filename,
dbus_bool_t is_raw,
DBusMessageValidity expected_validity,
void *data)
{
DBusString orig_data;
DBusString mutated;
const char *filename_c;
dbus_bool_t retval;
int i;
filename_c = _dbus_string_get_const_data (filename);
retval = FALSE;
if (!_dbus_string_init (&orig_data))
_dbus_assert_not_reached ("could not allocate string\n");
if (!_dbus_string_init (&mutated))
_dbus_assert_not_reached ("could not allocate string\n");
if (!dbus_internal_do_not_use_load_message_file (filename, is_raw,
&orig_data))
{
fprintf (stderr, "could not load file %s\n", filename_c);
goto failed;
}
printf (" changing one random byte 100 times\n");
i = 0;
while (i < 100)
{
randomly_change_one_byte (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" changing length 50 times\n");
i = 0;
while (i < 50)
{
randomly_modify_length (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" removing one byte 50 times\n");
i = 0;
while (i < 50)
{
randomly_remove_one_byte (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" adding one byte 50 times\n");
i = 0;
while (i < 50)
{
randomly_add_one_byte (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" changing ints to boundary values 50 times\n");
i = 0;
while (i < 50)
{
randomly_set_extreme_ints (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" changing typecodes 50 times\n");
i = 0;
while (i < 50)
{
randomly_change_one_type (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" changing message length 15 times\n");
i = 0;
while (i < 15)
{
randomly_shorten_or_lengthen (&orig_data, &mutated);
try_mutated_data (&mutated);
++i;
}
printf (" randomly making 2 of above modifications 42 times\n");
i = 0;
while (i < 42)
{
randomly_do_n_things (&orig_data, &mutated, 2);
try_mutated_data (&mutated);
++i;
}
printf (" randomly making 3 of above modifications 42 times\n");
i = 0;
while (i < 42)
{
randomly_do_n_things (&orig_data, &mutated, 3);
try_mutated_data (&mutated);
++i;
}
printf (" randomly making 4 of above modifications 42 times\n");
i = 0;
while (i < 42)
{
randomly_do_n_things (&orig_data, &mutated, 4);
try_mutated_data (&mutated);
++i;
}
retval = TRUE;
failed:
_dbus_string_free (&orig_data);
_dbus_string_free (&mutated);
/* FALSE means end the whole process */
return retval;
}
static unsigned int
get_random_seed (void)
{
DBusString bytes;
unsigned int seed;
int fd;
const char *s;
seed = 0;
if (!_dbus_string_init (&bytes))
exit (1);
fd = open ("/dev/urandom", O_RDONLY);
if (fd < 0)
goto use_fallback;
if (_dbus_read (fd, &bytes, 4) != 4)
goto use_fallback;
close (fd);
s = _dbus_string_get_const_data (&bytes);
seed = * (unsigned int*) s;
goto out;
use_fallback:
{
long tv_usec;
fprintf (stderr, "could not open/read /dev/urandom, using current time for seed\n");
_dbus_get_monotonic_time (NULL, &tv_usec);
seed = tv_usec;
}
out:
_dbus_string_free (&bytes);
return seed;
}
int
main (int argc,
char **argv)
{
const char *test_data_dir;
const char *failure_dir_c;
int total_failures_found;
if (argc > 1)
test_data_dir = argv[1];
else
{
fprintf (stderr, "Must specify a top_srcdir/test/data directory\n");
return 1;
}
total_failures_found = 0;
total_attempts = 0;
if (!_dbus_string_init (&failure_dir))
return 1;
/* so you can leave it overnight safely */
#define MAX_FAILURES 1000
while (total_failures_found < MAX_FAILURES)
{
unsigned int seed;
failures_this_iteration = 0;
seed = get_random_seed ();
_dbus_string_set_length (&failure_dir, 0);
if (!_dbus_string_append (&failure_dir, "failures-"))
return 1;
if (!_dbus_string_append_uint (&failure_dir, seed))
return 1;
failure_dir_c = _dbus_string_get_const_data (&failure_dir);
if (mkdir (failure_dir_c, 0700) < 0)
{
if (errno != EEXIST)
fprintf (stderr, "didn't mkdir %s: %s\n",
failure_dir_c, strerror (errno));
}
printf ("next seed = %u \ttotal failures %d of %d attempts\n",
seed, total_failures_found, total_attempts);
srand (seed);
if (!dbus_internal_do_not_use_foreach_message_file (test_data_dir,
find_breaks_based_on,
NULL))
{
fprintf (stderr, "fatal error iterating over message files\n");
rmdir (failure_dir_c);
return 1;
}
printf (" did %d random mutations: %d %d %d %d %d %d %d\n",
_DBUS_N_ELEMENTS (times_we_did_each_thing),
times_we_did_each_thing[0],
times_we_did_each_thing[1],
times_we_did_each_thing[2],
times_we_did_each_thing[3],
times_we_did_each_thing[4],
times_we_did_each_thing[5],
times_we_did_each_thing[6]);
printf ("Found %d failures with seed %u stored in %s\n",
failures_this_iteration, seed, failure_dir_c);
total_failures_found += failures_this_iteration;
rmdir (failure_dir_c); /* does nothing if non-empty */
}
return 0;
}