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swaybar: handle SNI signals better

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This fixes a crash caused by callbacks not matching the right sender,
and frees old values later, before they are re-assigned.
This commit is contained in:
Ian Fan 2019-01-04 11:57:18 +00:00
parent b666fc76a6
commit d093c3ac55
2 changed files with 65 additions and 33 deletions
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4
include/swaybar/tray/item.h
View file

@ -35,6 +35,10 @@ struct swaybar_sni {
bool item_is_menu;
char *menu;
char *icon_theme_path; // non-standard KDE property
sd_bus_slot *new_icon_slot;
sd_bus_slot *new_attention_icon_slot;
sd_bus_slot *new_status_slot;
};
struct swaybar_sni *create_sni(char *id, struct swaybar_tray *tray);

94
swaybar/tray/item.c
View file

@ -78,6 +78,7 @@ static int read_pixmap(sd_bus_message *msg, struct swaybar_sni *sni,
sd_bus_message_exit_container(msg);
}
list_free_items_and_destroy(*dest);
*dest = pixmaps;
return ret;
@ -121,6 +122,10 @@ static int get_property_callback(sd_bus_message *msg, void *data,
goto cleanup;
}
} else {
if (*type == 's' || *type == 'o') {
free(*(char **)dest);
}
ret = sd_bus_message_read(msg, type, dest);
if (ret < 0) {
wlr_log(WLR_DEBUG, "Failed to read property %s: %s", prop,
@ -156,55 +161,73 @@ static void sni_get_property_async(struct swaybar_sni *sni, const char *prop,
}
}
/*
* There is a quirk in sd-bus that in some systems, it is unable to get the
* well-known names on the bus, so it cannot identify if an incoming signal,
* which uses the sender's unique name, actually matches the callback's matching
* sender if the callback uses a well-known name, in which case it just calls
* the callback and hopes for the best, resulting in false positives. In the
* case of NewIcon & NewAttentionIcon, this doesn't affect anything, but it
* means that for NewStatus, if the SNI does not definitely match the sender,
* then the safe thing to do is to query the status independently.
* This function returns 1 if the SNI definitely matches the signal sender,
* which is returned by the calling function to indicate that signal matching
* can stop since it has already found the required callback, otherwise, it
* returns 0, which allows matching to continue.
*/
static int sni_check_msg_sender(struct swaybar_sni *sni, sd_bus_message *msg,
const char *signal) {
bool has_well_known_names =
sd_bus_creds_get_mask(sd_bus_message_get_creds(msg)) & SD_BUS_CREDS_WELL_KNOWN_NAMES;
if (sni->service[0] == ':' || has_well_known_names) {
wlr_log(WLR_DEBUG, "%s has new %s", sni->watcher_id, signal);
return 1;
} else {
wlr_log(WLR_DEBUG, "%s may have new %s", sni->watcher_id, signal);
return 0;
}
}
static int handle_new_icon(sd_bus_message *msg, void *data, sd_bus_error *error) {
struct swaybar_sni *sni = data;
wlr_log(WLR_DEBUG, "%s has new IconName", sni->watcher_id);
free(sni->icon_name);
sni->icon_name = NULL;
sni_get_property_async(sni, "IconName", "s", &sni->icon_name);
list_free_items_and_destroy(sni->icon_pixmap);
sni->icon_pixmap = NULL;
sni_get_property_async(sni, "IconPixmap", NULL, &sni->icon_pixmap);
return 0;
return sni_check_msg_sender(sni, msg, "icon");
}
static int handle_new_attention_icon(sd_bus_message *msg, void *data,
sd_bus_error *error) {
struct swaybar_sni *sni = data;
wlr_log(WLR_DEBUG, "%s has new AttentionIconName", sni->watcher_id);
free(sni->attention_icon_name);
sni->attention_icon_name = NULL;
sni_get_property_async(sni, "AttentionIconName", "s", &sni->attention_icon_name);
list_free_items_and_destroy(sni->attention_icon_pixmap);
sni->attention_icon_pixmap = NULL;
sni_get_property_async(sni, "AttentionIconPixmap", NULL, &sni->attention_icon_pixmap);
return 0;
return sni_check_msg_sender(sni, msg, "attention icon");
}
static int handle_new_status(sd_bus_message *msg, void *data, sd_bus_error *error) {
char *status;
int ret = sd_bus_message_read(msg, "s", &status);
if (ret < 0) {
wlr_log(WLR_DEBUG, "Failed to read new status message: %s", strerror(-ret));
struct swaybar_sni *sni = data;
int ret = sni_check_msg_sender(sni, msg, "status");
if (ret == 1) {
char *status;
int r = sd_bus_message_read(msg, "s", &status);
if (r < 0) {
wlr_log(WLR_ERROR, "Failed to read new status message: %s", strerror(-ret));
ret = r;
} else {
free(sni->status);
sni->status = strdup(status);
wlr_log(WLR_DEBUG, "%s has new status: %s", sni->watcher_id, status);
set_sni_dirty(sni);
}
} else {
struct swaybar_sni *sni = data;
free(sni->status);
sni->status = strdup(status);
wlr_log(WLR_DEBUG, "%s has new Status '%s'", sni->watcher_id, status);
set_sni_dirty(sni);
sni_get_property_async(sni, "Status", "s", &sni->status);
}
return ret;
}
static void sni_match_signal(struct swaybar_sni *sni, char *signal,
sd_bus_message_handler_t callback) {
int ret = sd_bus_match_signal(sni->tray->bus, NULL, sni->service, sni->path,
static void sni_match_signal(struct swaybar_sni *sni, sd_bus_slot **slot,
char *signal, sd_bus_message_handler_t callback) {
int ret = sd_bus_match_signal(sni->tray->bus, slot, sni->service, sni->path,
sni->interface, signal, callback, sni);
if (ret < 0) {
wlr_log(WLR_DEBUG, "Failed to subscribe to signal %s: %s", signal,
@ -241,9 +264,10 @@ struct swaybar_sni *create_sni(char *id, struct swaybar_tray *tray) {
sni_get_property_async(sni, "ItemIsMenu", "b", &sni->item_is_menu);
sni_get_property_async(sni, "Menu", "o", &sni->menu);
sni_match_signal(sni, "NewIcon", handle_new_icon);
sni_match_signal(sni, "NewAttentionIcon", handle_new_attention_icon);
sni_match_signal(sni, "NewStatus", handle_new_status);
sni_match_signal(sni, &sni->new_icon_slot, "NewIcon", handle_new_icon);
sni_match_signal(sni, &sni->new_attention_icon_slot, "NewAttentionIcon",
handle_new_attention_icon);
sni_match_signal(sni, &sni->new_status_slot, "NewStatus", handle_new_status);
return sni;
}
@ -253,6 +277,10 @@ void destroy_sni(struct swaybar_sni *sni) {
return;
}
sd_bus_slot_unref(sni->new_icon_slot);
sd_bus_slot_unref(sni->new_attention_icon_slot);
sd_bus_slot_unref(sni->new_status_slot);
free(sni->watcher_id);
free(sni->service);
free(sni->path);