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* Fix unlocked accesses to feature_list. The feature_list is now also 

protected by the features_lock.

* Made all calls to ast_find_call_feature() have the features_lock held.

* Fixed set_config_flags() to actually use find_group() to look for
feature groups in DYNAMIC_FEATURES.  The code originally assumed all
feature groups were listed in DYNAMIC_FEATURES.

* Make everyone use ast_rdlock_call_features(),
ast_unlock_call_features(), and new ast_wrlock_call_features() instead of
directly calling the rwlock API on features_lock.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@385277 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett 2013-04-10 23:03:30 +00:00
parent ff7ecd3dbf
commit eb2d144195
2 changed files with 80 additions and 66 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

141
main/features.c
View File

@ -3126,6 +3126,25 @@ static int builtin_atxfer(struct ast_channel *chan, struct ast_channel *peer, st
AST_RWLOCK_DEFINE_STATIC(features_lock);
/*! \note This is protected by features_lock. */
static AST_LIST_HEAD_NOLOCK_STATIC(feature_list, ast_call_feature);
static void ast_wrlock_call_features(void)
{
ast_rwlock_wrlock(&features_lock);
}
void ast_rdlock_call_features(void)
{
ast_rwlock_rdlock(&features_lock);
}
void ast_unlock_call_features(void)
{
ast_rwlock_unlock(&features_lock);
}
/*! \note This is protected by features_lock. */
static struct ast_call_feature builtin_features[] = {
{ AST_FEATURE_REDIRECT, "Blind Transfer", "blindxfer", "#", "#", builtin_blindtransfer, AST_FEATURE_FLAG_NEEDSDTMF, "" },
{ AST_FEATURE_REDIRECT, "Attended Transfer", "atxfer", "", "", builtin_atxfer, AST_FEATURE_FLAG_NEEDSDTMF, "" },
@ -3135,10 +3154,7 @@ static struct ast_call_feature builtin_features[] = {
{ AST_FEATURE_AUTOMIXMON, "One Touch MixMonitor", "automixmon", "", "", builtin_automixmonitor, AST_FEATURE_FLAG_NEEDSDTMF, "" },
};
static AST_RWLIST_HEAD_STATIC(feature_list, ast_call_feature);
/*! \brief register new feature into feature_list*/
/*! \brief register new feature into feature_list */
void ast_register_feature(struct ast_call_feature *feature)
{
if (!feature) {
@ -3146,9 +3162,9 @@ void ast_register_feature(struct ast_call_feature *feature)
return;
}
AST_RWLIST_WRLOCK(&feature_list);
AST_RWLIST_INSERT_HEAD(&feature_list,feature,feature_entry);
AST_RWLIST_UNLOCK(&feature_list);
ast_wrlock_call_features();
AST_LIST_INSERT_HEAD(&feature_list, feature, feature_entry);
ast_unlock_call_features();
ast_verb(2, "Registered Feature '%s'\n",feature->sname);
}
@ -3225,9 +3241,9 @@ void ast_unregister_feature(struct ast_call_feature *feature)
return;
}
AST_RWLIST_WRLOCK(&feature_list);
AST_RWLIST_REMOVE(&feature_list, feature, feature_entry);
AST_RWLIST_UNLOCK(&feature_list);
ast_wrlock_call_features();
AST_LIST_REMOVE(&feature_list, feature, feature_entry);
ast_unlock_call_features();
ast_free(feature);
}
@ -3237,19 +3253,23 @@ static void ast_unregister_features(void)
{
struct ast_call_feature *feature;
AST_RWLIST_WRLOCK(&feature_list);
while ((feature = AST_RWLIST_REMOVE_HEAD(&feature_list, feature_entry))) {
ast_wrlock_call_features();
while ((feature = AST_LIST_REMOVE_HEAD(&feature_list, feature_entry))) {
ast_free(feature);
}
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
}
/*! \brief find a call feature by name */
/*!
* \internal
* \brief find a dynamic call feature by name
* \pre Expects features_lock to be at least readlocked
*/
static struct ast_call_feature *find_dynamic_feature(const char *name)
{
struct ast_call_feature *tmp;
AST_RWLIST_TRAVERSE(&feature_list, tmp, feature_entry) {
AST_LIST_TRAVERSE(&feature_list, tmp, feature_entry) {
if (!strcasecmp(tmp->sname, name)) {
break;
}
@ -3295,19 +3315,9 @@ static struct feature_group *find_group(const char *name)
return fg;
}
void ast_rdlock_call_features(void)
{
ast_rwlock_rdlock(&features_lock);
}
void ast_unlock_call_features(void)
{
ast_rwlock_unlock(&features_lock);
}
/*!
* \internal
* \pre Expects feature_lock to be readlocked
* \pre Expects features_lock to be at least readlocked
*/
struct ast_call_feature *ast_find_call_feature(const char *name)
{
@ -3453,7 +3463,7 @@ static struct ast_datastore *get_feature_chan_ds(struct ast_channel *chan)
* \internal
* \brief Get the extension for a given builtin feature
*
* \pre expects feature_lock to be readlocked
* \pre expects features_lock to be readlocked
*
* \retval 0 success
* \retval non-zero failiure
@ -3570,17 +3580,17 @@ static void unmap_features(void)
{
int x;
ast_rwlock_wrlock(&features_lock);
ast_wrlock_call_features();
for (x = 0; x < FEATURES_COUNT; x++)
strcpy(builtin_features[x].exten, builtin_features[x].default_exten);
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
}
static int remap_feature(const char *name, const char *value)
{
int x, res = -1;
ast_rwlock_wrlock(&features_lock);
ast_wrlock_call_features();
for (x = 0; x < FEATURES_COUNT; x++) {
if (strcasecmp(builtin_features[x].sname, name))
continue;
@ -3589,7 +3599,7 @@ static int remap_feature(const char *name, const char *value)
res = 0;
break;
}
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
return res;
}
@ -3620,7 +3630,7 @@ static int feature_interpret_helper(struct ast_channel *chan, struct ast_channel
return -1; /* can not run feature operation */
}
ast_rwlock_rdlock(&features_lock);
ast_rdlock_call_features();
for (x = 0; x < FEATURES_COUNT; x++) {
char feature_exten[FEATURE_MAX_LEN] = "";
@ -3662,7 +3672,7 @@ static int feature_interpret_helper(struct ast_channel *chan, struct ast_channel
"Result: fail");
}
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
if (!dynamic_features_buf || !ast_str_strlen(dynamic_features_buf) || feature_detected) {
return res;
@ -3672,9 +3682,7 @@ static int feature_interpret_helper(struct ast_channel *chan, struct ast_channel
while ((tok = strsep(&tmp, "#"))) {
AST_RWLIST_RDLOCK(&feature_groups);
fg = find_group(tok);
if (fg) {
AST_LIST_TRAVERSE(&fg->features, fge, entry) {
if (!strcmp(fge->exten, code)) {
@ -3697,13 +3705,12 @@ static int feature_interpret_helper(struct ast_channel *chan, struct ast_channel
break;
}
}
AST_RWLIST_UNLOCK(&feature_groups);
AST_RWLIST_RDLOCK(&feature_list);
ast_rdlock_call_features();
if (!(tmpfeature = find_dynamic_feature(tok))) {
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
continue;
}
@ -3719,14 +3726,14 @@ static int feature_interpret_helper(struct ast_channel *chan, struct ast_channel
memcpy(feature, tmpfeature, sizeof(*feature));
}
if (res != AST_FEATURE_RETURN_KEEPTRYING) {
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
break;
}
res = AST_FEATURE_RETURN_PASSDIGITS;
} else if (!strncmp(tmpfeature->exten, code, strlen(code)))
res = AST_FEATURE_RETURN_STOREDIGITS;
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
}
return res;
@ -3809,7 +3816,7 @@ static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config
ast_clear_flag(config, AST_FLAGS_ALL);
ast_rwlock_rdlock(&features_lock);
ast_rdlock_call_features();
for (x = 0; x < FEATURES_COUNT; x++) {
if (!ast_test_flag(builtin_features + x, AST_FEATURE_FLAG_NEEDSDTMF))
continue;
@ -3820,7 +3827,7 @@ static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config
if (ast_test_flag(&(config->features_callee), builtin_features[x].feature_mask))
ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
}
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
if (!(ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_0) && ast_test_flag(config, AST_BRIDGE_DTMF_CHANNEL_1))) {
const char *dynamic_features = pbx_builtin_getvar_helper(chan, "DYNAMIC_FEATURES");
@ -3835,7 +3842,8 @@ static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config
struct feature_group *fg;
AST_RWLIST_RDLOCK(&feature_groups);
AST_RWLIST_TRAVERSE(&feature_groups, fg, entry) {
fg = find_group(tok);
if (fg) {
struct feature_group_exten *fge;
AST_LIST_TRAVERSE(&fg->features, fge, entry) {
@ -3849,7 +3857,7 @@ static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config
}
AST_RWLIST_UNLOCK(&feature_groups);
AST_RWLIST_RDLOCK(&feature_list);
ast_rdlock_call_features();
if ((feature = find_dynamic_feature(tok)) && ast_test_flag(feature, AST_FEATURE_FLAG_NEEDSDTMF)) {
if (ast_test_flag(feature, AST_FEATURE_FLAG_BYCALLER)) {
ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_0);
@ -3858,7 +3866,7 @@ static void set_config_flags(struct ast_channel *chan, struct ast_bridge_config
ast_set_flag(config, AST_BRIDGE_DTMF_CHANNEL_1);
}
}
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
}
}
}
@ -3974,7 +3982,7 @@ static struct ast_channel *feature_request_and_dial(struct ast_channel *caller,
}
/* support dialing of the featuremap disconnect code while performing an attended tranfer */
ast_rwlock_rdlock(&features_lock);
ast_rdlock_call_features();
for (x = 0; x < FEATURES_COUNT; x++) {
if (strcasecmp(builtin_features[x].sname, "disconnect"))
continue;
@ -3985,7 +3993,7 @@ static struct ast_channel *feature_request_and_dial(struct ast_channel *caller,
memset(dialed_code, 0, len);
break;
}
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
x = 0;
started = ast_tvnow();
to = timeout;
@ -6247,14 +6255,14 @@ static void process_applicationmap_line(struct ast_variable *var)
return;
}
AST_RWLIST_RDLOCK(&feature_list);
ast_rdlock_call_features();
if (find_dynamic_feature(var->name)) {
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
ast_log(LOG_WARNING, "Dynamic Feature '%s' specified more than once!\n",
var->name);
return;
}
AST_RWLIST_UNLOCK(&feature_list);
ast_unlock_call_features();
if (!(feature = ast_calloc(1, sizeof(*feature)))) {
return;
@ -6456,14 +6464,13 @@ static int process_config(struct ast_config *cfg)
for (var = ast_variable_browse(cfg, ctg); var; var = var->next) {
struct ast_call_feature *feature;
AST_RWLIST_RDLOCK(&feature_list);
if (!(feature = find_dynamic_feature(var->name)) &&
!(feature = ast_find_call_feature(var->name))) {
AST_RWLIST_UNLOCK(&feature_list);
ast_rdlock_call_features();
feature = ast_find_call_feature(var->name);
ast_unlock_call_features();
if (!feature) {
ast_log(LOG_WARNING, "Feature '%s' was not found.\n", var->name);
continue;
}
AST_RWLIST_UNLOCK(&feature_list);
register_group_feature(fg, var->value, feature);
}
@ -7263,41 +7270,41 @@ static char *handle_feature_show(struct ast_cli_entry *e, int cmd, struct ast_cl
ast_cli(a->fd, HFS_FORMAT, "Pickup", "*8", ast_pickup_ext()); /* default hardcoded above, so we'll hardcode it here */
ast_rwlock_rdlock(&features_lock);
ast_rdlock_call_features();
for (i = 0; i < FEATURES_COUNT; i++)
ast_cli(a->fd, HFS_FORMAT, builtin_features[i].fname, builtin_features[i].default_exten, builtin_features[i].exten);
ast_rwlock_unlock(&features_lock);
ast_unlock_call_features();
ast_cli(a->fd, "\n");
ast_cli(a->fd, HFS_FORMAT, "Dynamic Feature", "Default", "Current");
ast_cli(a->fd, HFS_FORMAT, "---------------", "-------", "-------");
if (AST_RWLIST_EMPTY(&feature_list)) {
ast_rdlock_call_features();
if (AST_LIST_EMPTY(&feature_list)) {
ast_cli(a->fd, "(none)\n");
} else {
AST_RWLIST_RDLOCK(&feature_list);
AST_RWLIST_TRAVERSE(&feature_list, feature, feature_entry) {
AST_LIST_TRAVERSE(&feature_list, feature, feature_entry) {
ast_cli(a->fd, HFS_FORMAT, feature->sname, "no def", feature->exten);
}
AST_RWLIST_UNLOCK(&feature_list);
}
ast_unlock_call_features();
ast_cli(a->fd, "\nFeature Groups:\n");
ast_cli(a->fd, "---------------\n");
AST_RWLIST_RDLOCK(&feature_groups);
if (AST_RWLIST_EMPTY(&feature_groups)) {
ast_cli(a->fd, "(none)\n");
} else {
struct feature_group *fg;
struct feature_group_exten *fge;
AST_RWLIST_RDLOCK(&feature_groups);
AST_RWLIST_TRAVERSE(&feature_groups, fg, entry) {
ast_cli(a->fd, "===> Group: %s\n", fg->gname);
AST_LIST_TRAVERSE(&fg->features, fge, entry) {
ast_cli(a->fd, "===> --> %s (%s)\n", fge->feature->sname, fge->exten);
}
}
AST_RWLIST_UNLOCK(&feature_groups);
}
AST_RWLIST_UNLOCK(&feature_groups);
iter = ao2_iterator_init(parkinglots, 0);
while ((curlot = ao2_iterator_next(&iter))) {
@ -7667,7 +7674,7 @@ static int manager_parkinglot_list(struct mansession *s, const struct message *m
return RESULT_SUCCESS;
}
/*!
/*!
* \brief Dump parking lot status
* \param s
* \param m
@ -9079,8 +9086,12 @@ static int featuremap_write(struct ast_channel *chan, const char *cmd, char *dat
{
struct feature_datastore *feature_ds;
struct feature_exten *fe;
struct ast_call_feature *feat;
if (!ast_find_call_feature(data)) {
ast_rdlock_call_features();
feat = ast_find_call_feature(data);
ast_unlock_call_features();
if (!feat) {
ast_log(LOG_WARNING, "Invalid argument '%s' to FEATUREMAP()\n", data);
return -1;
}

5
main/manager.c
View File

@ -3902,7 +3902,10 @@ static int action_atxfer(struct mansession *s, const struct message *m)
return 0;
}
if (!(atxfer_feature = ast_find_call_feature("atxfer"))) {
ast_rdlock_call_features();
atxfer_feature = ast_find_call_feature("atxfer");
ast_unlock_call_features();
if (!atxfer_feature) {
astman_send_error(s, m, "No attended transfer feature found");
return 0;
}