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-rw-r--r--backend/session/logind.c121
1 files changed, 118 insertions, 3 deletions
diff --git a/backend/session/logind.c b/backend/session/logind.c
index 5bde16c2..0bacfbcd 100644
--- a/backend/session/logind.c
+++ b/backend/session/logind.c
@@ -487,6 +487,123 @@ static int dbus_event(int fd, uint32_t mask, void *data) {
return 1;
}
+static bool contains_str(const char *needle, const char **haystack) {
+ for (int i = 0; haystack[i]; i++) {
+ if (strcmp(haystack[i], needle) == 0) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool get_greeter_session(char **session_id) {
+ char *class = NULL;
+ char **user_sessions = NULL;
+ int user_session_count = sd_uid_get_sessions(getuid(), 1, &user_sessions);
+
+ if (user_session_count < 0) {
+ wlr_log(WLR_ERROR, "Failed to get sessions");
+ goto out;
+ }
+
+ if (user_session_count == 0) {
+ wlr_log(WLR_ERROR, "User has no sessions");
+ goto out;
+ }
+
+ for (int i = 0; i < user_session_count; ++i) {
+ int ret = sd_session_get_class(user_sessions[i], &class);
+ if (ret < 0) {
+ continue;
+ }
+
+ if (strcmp(class, "greeter") == 0) {
+ *session_id = strdup(user_sessions[i]);
+ goto out;
+ }
+ }
+
+out:
+ free(class);
+ for (int i = 0; i < user_session_count; ++i) {
+ free(user_sessions[i]);
+ }
+ free(user_sessions);
+
+ return *session_id != NULL;
+}
+
+static bool get_display_session(char **session_id) {
+ assert(session_id != NULL);
+ int ret;
+
+ // If there's a session active for the current process then just use that
+ ret = sd_pid_get_session(getpid(), session_id);
+ if (ret == 0) {
+ return true;
+ }
+
+ char *type = NULL;
+ char *state = NULL;
+
+ // Find any active sessions for the user if the process isn't part of an
+ // active session itself
+ ret = sd_uid_get_display(getuid(), session_id);
+ if (ret < 0 && ret != -ENODATA) {
+ wlr_log(WLR_ERROR, "Failed to get display: %s", strerror(-ret));
+ goto error;
+ }
+
+ if (ret != 0 && !get_greeter_session(session_id)) {
+ wlr_log(WLR_ERROR, "Couldn't find an active session or a greeter session");
+ goto error;
+ }
+
+ assert(*session_id != NULL);
+
+ // Check that the available session is graphical
+ ret = sd_session_get_type(*session_id, &type);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Couldn't get a type for session '%s': %s",
+ *session_id, strerror(-ret));
+ goto error;
+ }
+
+ const char *graphical_session_types[] = {"wayland", "x11", "mir", NULL};
+ if (!contains_str(type, graphical_session_types)) {
+ wlr_log(WLR_ERROR, "Session '%s' isn't a graphical session (type: '%s')",
+ *session_id, type);
+ goto error;
+ }
+
+ // Check that the session is active
+ ret = sd_session_get_state(*session_id, &state);
+ if (ret < 0) {
+ wlr_log(WLR_ERROR, "Couldn't get state for session '%s': %s",
+ *session_id, strerror(-ret));
+ goto error;
+ }
+
+ const char *active_states[] = {"active", "online", NULL};
+ if (!contains_str(state, active_states)) {
+ wlr_log(WLR_ERROR, "Session '%s' is not active", *session_id);
+ goto error;
+ }
+
+ free(type);
+ free(state);
+ return true;
+
+error:
+ free(type);
+ free(state);
+ free(*session_id);
+ *session_id = NULL;
+
+ return false;
+}
+
static struct wlr_session *logind_session_create(struct wl_display *disp) {
int ret;
struct logind_session *session = calloc(1, sizeof(*session));
@@ -495,9 +612,7 @@ static struct wlr_session *logind_session_create(struct wl_display *disp) {
return NULL;
}
- ret = sd_pid_get_session(getpid(), &session->id);
- if (ret < 0) {
- wlr_log(WLR_ERROR, "Failed to get session id: %s", strerror(-ret));
+ if (!get_display_session(&session->id)) {
goto error;
}