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qemu/tests/test-util-filemonitor.c
Daniel P. Berrangé b4682a63f8 filemon: fix watch IDs to avoid potential wraparound issues 
Watch IDs are allocated from incrementing a int counter against
the QFileMonitor object. In very long life QEMU processes with
a huge amount of USB MTP activity creating & deleting directories
it is just about conceivable that the int counter can wrap
around. This would result in incorrect behaviour of the file
monitor watch APIs due to clashing watch IDs.

Instead of trying to detect this situation, this patch changes
the way watch IDs are allocated. It is turned into an int64_t
variable where the high 32 bits are set from the underlying
inotify "int" ID. This gives an ID that is guaranteed unique
for the directory as a whole, and we can rely on the kernel
to enforce this. QFileMonitor then sets the low 32 bits from
a per-directory counter.

The USB MTP device only sets watches on the directory as a
whole, not files within, so there is no risk of guest
triggered wrap around on the low 32 bits.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-04-02 13:52:02 +01:00

682 lines
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/*
* Tests for util/filemonitor-*.c
*
* Copyright 2018 Red Hat, Inc.
*
* 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 library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "qapi/error.h"
#include "qemu/filemonitor.h"
#include <utime.h>
enum {
QFILE_MONITOR_TEST_OP_ADD_WATCH,
QFILE_MONITOR_TEST_OP_DEL_WATCH,
QFILE_MONITOR_TEST_OP_EVENT,
QFILE_MONITOR_TEST_OP_CREATE,
QFILE_MONITOR_TEST_OP_APPEND,
QFILE_MONITOR_TEST_OP_TRUNC,
QFILE_MONITOR_TEST_OP_RENAME,
QFILE_MONITOR_TEST_OP_TOUCH,
QFILE_MONITOR_TEST_OP_UNLINK,
QFILE_MONITOR_TEST_OP_MKDIR,
QFILE_MONITOR_TEST_OP_RMDIR,
};
typedef struct {
int type;
const char *filesrc;
const char *filedst;
int64_t *watchid;
int eventid;
} QFileMonitorTestOp;
typedef struct {
int64_t id;
QFileMonitorEvent event;
char *filename;
} QFileMonitorTestRecord;
typedef struct {
QemuMutex lock;
GList *records;
} QFileMonitorTestData;
static QemuMutex evlock;
static bool evstopping;
static bool evrunning;
static bool debug;
/*
* Main function for a background thread that is
* running the event loop during the test
*/
static void *
qemu_file_monitor_test_event_loop(void *opaque G_GNUC_UNUSED)
{
qemu_mutex_lock(&evlock);
while (!evstopping) {
qemu_mutex_unlock(&evlock);
main_loop_wait(true);
qemu_mutex_lock(&evlock);
}
evrunning = false;
qemu_mutex_unlock(&evlock);
return NULL;
}
/*
* File monitor event handler which simply maintains
* an ordered list of all events that it receives
*/
static void
qemu_file_monitor_test_handler(int64_t id,
QFileMonitorEvent event,
const char *filename,
void *opaque)
{
QFileMonitorTestData *data = opaque;
QFileMonitorTestRecord *rec = g_new0(QFileMonitorTestRecord, 1);
rec->id = id;
rec->event = event;
rec->filename = g_strdup(filename);
qemu_mutex_lock(&data->lock);
data->records = g_list_append(data->records, rec);
qemu_mutex_unlock(&data->lock);
}
static void
qemu_file_monitor_test_record_free(QFileMonitorTestRecord *rec)
{
g_free(rec->filename);
g_free(rec);
}
/*
* Get the next event record that has been received by
* the file monitor event handler. Since events are
* emitted in the background thread running the event
* loop, we can't assume there is a record available
* immediately. Thus we will sleep for upto 5 seconds
* to wait for the event to be queued for us.
*/
static QFileMonitorTestRecord *
qemu_file_monitor_test_next_record(QFileMonitorTestData *data)
{
GTimer *timer = g_timer_new();
QFileMonitorTestRecord *record = NULL;
GList *tmp;
qemu_mutex_lock(&data->lock);
while (!data->records && g_timer_elapsed(timer, NULL) < 5) {
qemu_mutex_unlock(&data->lock);
usleep(10 * 1000);
qemu_mutex_lock(&data->lock);
}
if (data->records) {
record = data->records->data;
tmp = data->records;
data->records = g_list_remove_link(data->records, tmp);
g_list_free(tmp);
}
qemu_mutex_unlock(&data->lock);
g_timer_destroy(timer);
return record;
}
/*
* Check whether the event record we retrieved matches
* data we were expecting to see for the event
*/
static bool
qemu_file_monitor_test_expect(QFileMonitorTestData *data,
int64_t id,
QFileMonitorEvent event,
const char *filename)
{
QFileMonitorTestRecord *rec;
bool ret = false;
rec = qemu_file_monitor_test_next_record(data);
if (!rec) {
g_printerr("Missing event watch id %" PRIx64 " event %d file %s\n",
id, event, filename);
return false;
}
if (id != rec->id) {
g_printerr("Expected watch id %" PRIx64 " but got %" PRIx64 "\n",
id, rec->id);
goto cleanup;
}
if (event != rec->event) {
g_printerr("Expected event %d but got %d\n", event, rec->event);
goto cleanup;
}
if (!g_str_equal(filename, rec->filename)) {
g_printerr("Expected filename %s but got %s\n",
filename, rec->filename);
goto cleanup;
}
ret = true;
cleanup:
qemu_file_monitor_test_record_free(rec);
return ret;
}
static void
test_file_monitor_events(void)
{
int64_t watch0 = 0;
int64_t watch1 = 0;
int64_t watch2 = 0;
int64_t watch3 = 0;
int64_t watch4 = 0;
int64_t watch5 = 0;
QFileMonitorTestOp ops[] = {
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = NULL, .watchid = &watch0 },
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = "one.txt", .watchid = &watch1 },
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = "two.txt", .watchid = &watch2 },
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
.filesrc = "one.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch1,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
.filesrc = "two.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
.filesrc = "three.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "three.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_UNLINK,
.filesrc = "three.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "three.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_RENAME,
.filesrc = "one.txt", .filedst = "two.txt" },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch1,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_APPEND,
.filesrc = "two.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_MODIFIED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_MODIFIED },
{ .type = QFILE_MONITOR_TEST_OP_TOUCH,
.filesrc = "two.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_ATTRIBUTES },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_ATTRIBUTES },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = "one.txt", .watchid = &watch1 },
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = "one.txt", .watchid = &watch3 },
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
.filesrc = "one.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch3,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = "one.txt", .watchid = &watch3 },
{ .type = QFILE_MONITOR_TEST_OP_UNLINK,
.filesrc = "one.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_MKDIR,
.filesrc = "fish", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "fish", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = "fish/", .watchid = &watch4 },
{ .type = QFILE_MONITOR_TEST_OP_ADD_WATCH,
.filesrc = "fish/one.txt", .watchid = &watch5 },
{ .type = QFILE_MONITOR_TEST_OP_CREATE,
.filesrc = "fish/one.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch4,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch5,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = "fish/one.txt", .watchid = &watch5 },
{ .type = QFILE_MONITOR_TEST_OP_RENAME,
.filesrc = "fish/one.txt", .filedst = "two.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "one.txt", .watchid = &watch4,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_CREATED },
{ .type = QFILE_MONITOR_TEST_OP_RMDIR,
.filesrc = "fish", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "", .watchid = &watch4,
.eventid = QFILE_MONITOR_EVENT_IGNORED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "fish", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = "fish", .watchid = &watch4 },
{ .type = QFILE_MONITOR_TEST_OP_UNLINK,
.filesrc = "two.txt", },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch0,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_EVENT,
.filesrc = "two.txt", .watchid = &watch2,
.eventid = QFILE_MONITOR_EVENT_DELETED },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = "two.txt", .watchid = &watch2 },
{ .type = QFILE_MONITOR_TEST_OP_DEL_WATCH,
.filesrc = NULL, .watchid = &watch0 },
};
Error *local_err = NULL;
GError *gerr = NULL;
QFileMonitor *mon = qemu_file_monitor_new(&local_err);
QemuThread th;
GTimer *timer;
gchar *dir = NULL;
int err = -1;
gsize i;
char *pathsrc = NULL;
char *pathdst = NULL;
QFileMonitorTestData data;
GHashTable *ids = g_hash_table_new(g_int64_hash, g_int64_equal);
qemu_mutex_init(&data.lock);
data.records = NULL;
/*
* The file monitor needs the main loop running in
* order to receive events from inotify. We must
* thus spawn a background thread to run an event
* loop impl, while this thread triggers the
* actual file operations we're testing
*/
evrunning = 1;
evstopping = 0;
qemu_thread_create(&th, "event-loop",
qemu_file_monitor_test_event_loop, NULL,
QEMU_THREAD_JOINABLE);
if (local_err) {
g_printerr("File monitoring not available: %s",
error_get_pretty(local_err));
error_free(local_err);
return;
}
dir = g_dir_make_tmp("test-util-filemonitor-XXXXXX",
&gerr);
if (!dir) {
g_printerr("Unable to create tmp dir %s",
gerr->message);
g_error_free(gerr);
abort();
}
/*
* Run through the operation sequence validating events
* as we go
*/
for (i = 0; i < G_N_ELEMENTS(ops); i++) {
const QFileMonitorTestOp *op = &(ops[i]);
int fd;
struct utimbuf ubuf;
char *watchdir;
const char *watchfile;
pathsrc = g_strdup_printf("%s/%s", dir, op->filesrc);
if (op->filedst) {
pathdst = g_strdup_printf("%s/%s", dir, op->filedst);
}
switch (op->type) {
case QFILE_MONITOR_TEST_OP_ADD_WATCH:
if (debug) {
g_printerr("Add watch %s %s\n",
dir, op->filesrc);
}
if (op->filesrc && strchr(op->filesrc, '/')) {
watchdir = g_strdup_printf("%s/%s", dir, op->filesrc);
watchfile = strrchr(watchdir, '/');
*(char *)watchfile = '\0';
watchfile++;
if (*watchfile == '\0') {
watchfile = NULL;
}
} else {
watchdir = g_strdup(dir);
watchfile = op->filesrc;
}
*op->watchid =
qemu_file_monitor_add_watch(mon,
watchdir,
watchfile,
qemu_file_monitor_test_handler,
&data,
&local_err);
g_free(watchdir);
if (*op->watchid < 0) {
g_printerr("Unable to add watch %s",
error_get_pretty(local_err));
goto cleanup;
}
if (debug) {
g_printerr("Watch ID %" PRIx64 "\n", *op->watchid);
}
if (g_hash_table_contains(ids, op->watchid)) {
g_printerr("Watch ID %" PRIx64 "already exists", *op->watchid);
goto cleanup;
}
g_hash_table_add(ids, op->watchid);
break;
case QFILE_MONITOR_TEST_OP_DEL_WATCH:
if (debug) {
g_printerr("Del watch %s %" PRIx64 "\n", dir, *op->watchid);
}
if (op->filesrc && strchr(op->filesrc, '/')) {
watchdir = g_strdup_printf("%s/%s", dir, op->filesrc);
watchfile = strrchr(watchdir, '/');
*(char *)watchfile = '\0';
} else {
watchdir = g_strdup(dir);
}
g_hash_table_remove(ids, op->watchid);
qemu_file_monitor_remove_watch(mon,
watchdir,
*op->watchid);
g_free(watchdir);
break;
case QFILE_MONITOR_TEST_OP_EVENT:
if (debug) {
g_printerr("Event id=%" PRIx64 " event=%d file=%s\n",
*op->watchid, op->eventid, op->filesrc);
}
if (!qemu_file_monitor_test_expect(
&data, *op->watchid, op->eventid, op->filesrc))
goto cleanup;
break;
case QFILE_MONITOR_TEST_OP_CREATE:
if (debug) {
g_printerr("Create %s\n", pathsrc);
}
fd = open(pathsrc, O_WRONLY | O_CREAT, 0700);
if (fd < 0) {
g_printerr("Unable to create %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
close(fd);
break;
case QFILE_MONITOR_TEST_OP_APPEND:
if (debug) {
g_printerr("Append %s\n", pathsrc);
}
fd = open(pathsrc, O_WRONLY | O_APPEND, 0700);
if (fd < 0) {
g_printerr("Unable to open %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
if (write(fd, "Hello World", 10) != 10) {
g_printerr("Unable to write %s: %s",
pathsrc, strerror(errno));
close(fd);
goto cleanup;
}
close(fd);
break;
case QFILE_MONITOR_TEST_OP_TRUNC:
if (debug) {
g_printerr("Truncate %s\n", pathsrc);
}
if (truncate(pathsrc, 4) < 0) {
g_printerr("Unable to truncate %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_RENAME:
if (debug) {
g_printerr("Rename %s -> %s\n", pathsrc, pathdst);
}
if (rename(pathsrc, pathdst) < 0) {
g_printerr("Unable to rename %s to %s: %s",
pathsrc, pathdst, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_UNLINK:
if (debug) {
g_printerr("Unlink %s\n", pathsrc);
}
if (unlink(pathsrc) < 0) {
g_printerr("Unable to unlink %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_TOUCH:
if (debug) {
g_printerr("Touch %s\n", pathsrc);
}
ubuf.actime = 1024;
ubuf.modtime = 1025;
if (utime(pathsrc, &ubuf) < 0) {
g_printerr("Unable to touch %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_MKDIR:
if (debug) {
g_printerr("Mkdir %s\n", pathsrc);
}
if (mkdir(pathsrc, 0700) < 0) {
g_printerr("Unable to mkdir %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
case QFILE_MONITOR_TEST_OP_RMDIR:
if (debug) {
g_printerr("Rmdir %s\n", pathsrc);
}
if (rmdir(pathsrc) < 0) {
g_printerr("Unable to rmdir %s: %s",
pathsrc, strerror(errno));
goto cleanup;
}
break;
default:
g_assert_not_reached();
}
g_free(pathsrc);
g_free(pathdst);
pathsrc = pathdst = NULL;
}
g_assert_cmpint(g_hash_table_size(ids), ==, 0);
err = 0;
cleanup:
g_free(pathsrc);
g_free(pathdst);
qemu_mutex_lock(&evlock);
evstopping = 1;
timer = g_timer_new();
while (evrunning && g_timer_elapsed(timer, NULL) < 5) {
qemu_mutex_unlock(&evlock);
usleep(10 * 1000);
qemu_mutex_lock(&evlock);
}
qemu_mutex_unlock(&evlock);
if (g_timer_elapsed(timer, NULL) >= 5) {
g_printerr("Event loop failed to quit after 5 seconds\n");
}
g_timer_destroy(timer);
qemu_file_monitor_free(mon);
g_list_foreach(data.records,
(GFunc)qemu_file_monitor_test_record_free, NULL);
g_list_free(data.records);
qemu_mutex_destroy(&data.lock);
if (dir) {
for (i = 0; i < G_N_ELEMENTS(ops); i++) {
const QFileMonitorTestOp *op = &(ops[i]);
char *path = g_strdup_printf("%s/%s",
dir, op->filesrc);
if (op->type == QFILE_MONITOR_TEST_OP_MKDIR) {
rmdir(path);
g_free(path);
} else {
unlink(path);
g_free(path);
if (op->filedst) {
path = g_strdup_printf("%s/%s",
dir, op->filedst);
unlink(path);
g_free(path);
}
}
}
if (rmdir(dir) < 0) {
g_printerr("Failed to remove %s: %s\n",
dir, strerror(errno));
abort();
}
}
g_hash_table_unref(ids);
g_free(dir);
g_assert(err == 0);
}
int main(int argc, char **argv)
{
g_test_init(&argc, &argv, NULL);
qemu_init_main_loop(&error_abort);
qemu_mutex_init(&evlock);
debug = getenv("FILEMONITOR_DEBUG") != NULL;
g_test_add_func("/util/filemonitor", test_file_monitor_events);
return g_test_run();
}
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