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-rw-r--r--src/modules/module-systemd-login.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/src/modules/module-systemd-login.c b/src/modules/module-systemd-login.c
new file mode 100644
index 0000000..5140157
--- /dev/null
+++ b/src/modules/module-systemd-login.c
@@ -0,0 +1,243 @@
+/***
+ This file is part of PulseAudio.
+
+ Copyright 2012 Lennart Poettering
+
+ PulseAudio is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of the License,
+ or (at your option) any later version.
+
+ PulseAudio 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 Lesser General Public License
+ along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include <systemd/sd-login.h>
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/module.h>
+#include <pulsecore/log.h>
+#include <pulsecore/hashmap.h>
+#include <pulsecore/idxset.h>
+#include <pulsecore/modargs.h>
+
+PA_MODULE_AUTHOR("Lennart Poettering");
+PA_MODULE_DESCRIPTION("Create a client for each login session of this user");
+PA_MODULE_VERSION(PACKAGE_VERSION);
+PA_MODULE_LOAD_ONCE(true);
+
+static const char* const valid_modargs[] = {
+ NULL
+};
+
+struct session {
+ char *id;
+ pa_client *client;
+};
+
+struct userdata {
+ pa_module *module;
+ pa_core *core;
+ pa_hashmap *sessions, *previous_sessions;
+ sd_login_monitor *monitor;
+ pa_io_event *io;
+};
+
+static int add_session(struct userdata *u, const char *id) {
+ struct session *session;
+ pa_client_new_data data;
+
+ session = pa_xnew(struct session, 1);
+ session->id = pa_xstrdup(id);
+
+ pa_client_new_data_init(&data);
+ data.module = u->module;
+ data.driver = __FILE__;
+ pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "Login Session %s", id);
+ pa_proplist_sets(data.proplist, "systemd-login.session", id);
+ session->client = pa_client_new(u->core, &data);
+ pa_client_new_data_done(&data);
+
+ if (!session->client) {
+ pa_xfree(session->id);
+ pa_xfree(session);
+ return -1;
+ }
+
+ pa_hashmap_put(u->sessions, session->id, session);
+
+ pa_log_debug("Added new session %s", id);
+
+ /* Positive exit_idle_time is only useful when we have no session tracking
+ * capability, so we can set it to 0 now that we have detected a session.
+ * The benefit of setting exit_idle_time to 0 is that pulseaudio will exit
+ * immediately when the session ends. That in turn is useful, because some
+ * systems (those that use pam_systemd but don't use systemd for managing
+ * pulseaudio) clean $XDG_RUNTIME_DIR on logout, but fail to terminate all
+ * services that depend on the files in $XDG_RUNTIME_DIR. The directory
+ * contains our sockets, and if the sockets are removed without terminating
+ * pulseaudio, a quick relogin will likely cause trouble, because a new
+ * instance will be spawned while the old instance is still running. */
+ if (u->core->exit_idle_time > 0)
+ pa_core_set_exit_idle_time(u->core, 0);
+
+ return 0;
+}
+
+static void free_session(struct session *session) {
+ pa_assert(session);
+
+ pa_log_debug("Removing session %s", session->id);
+
+ pa_client_free(session->client);
+ pa_xfree(session->id);
+ pa_xfree(session);
+}
+
+static int get_session_list(struct userdata *u) {
+ int r;
+ char **sessions;
+ pa_hashmap *h;
+ struct session *o;
+
+ pa_assert(u);
+
+ r = sd_uid_get_sessions(getuid(), 0, &sessions);
+ if (r < 0)
+ return -1;
+
+ /* We copy all sessions that still exist from one hashmap to the
+ * other and then flush the remaining ones */
+
+ h = u->previous_sessions;
+ u->previous_sessions = u->sessions;
+ u->sessions = h;
+
+ if (sessions) {
+ char **s;
+
+ /* Note that the sessions array is allocated with libc's
+ * malloc()/free() calls, hence do not use pa_xfree() to free
+ * this here. */
+
+ for (s = sessions; *s; s++) {
+ o = pa_hashmap_remove(u->previous_sessions, *s);
+ if (o)
+ pa_hashmap_put(u->sessions, o->id, o);
+ else
+ add_session(u, *s);
+
+ free(*s);
+ }
+
+ free(sessions);
+ }
+
+ pa_hashmap_remove_all(u->previous_sessions);
+
+ return 0;
+}
+
+static void monitor_cb(
+ pa_mainloop_api*a,
+ pa_io_event* e,
+ int fd,
+ pa_io_event_flags_t events,
+ void *userdata) {
+
+ struct userdata *u = userdata;
+
+ pa_assert(u);
+
+ sd_login_monitor_flush(u->monitor);
+ get_session_list(u);
+}
+
+int pa__init(pa_module *m) {
+ struct userdata *u = NULL;
+ pa_modargs *ma;
+ sd_login_monitor *monitor = NULL;
+ int r;
+
+ pa_assert(m);
+
+ /* If we are not actually running logind become a NOP */
+ if (access("/run/systemd/seats/", F_OK) < 0)
+ return 0;
+
+ ma = pa_modargs_new(m->argument, valid_modargs);
+ if (!ma) {
+ pa_log("Failed to parse module arguments");
+ goto fail;
+ }
+
+ r = sd_login_monitor_new("session", &monitor);
+ if (r < 0) {
+ pa_log("Failed to create session monitor: %s", strerror(-r));
+ goto fail;
+ }
+
+ m->userdata = u = pa_xnew0(struct userdata, 1);
+ u->core = m->core;
+ u->module = m;
+ u->sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
+ u->previous_sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
+ u->monitor = monitor;
+
+ u->io = u->core->mainloop->io_new(u->core->mainloop, sd_login_monitor_get_fd(monitor), PA_IO_EVENT_INPUT, monitor_cb, u);
+
+ if (get_session_list(u) < 0)
+ goto fail;
+
+ pa_modargs_free(ma);
+
+ return 0;
+
+fail:
+ if (ma)
+ pa_modargs_free(ma);
+
+ pa__done(m);
+
+ return -1;
+}
+
+void pa__done(pa_module *m) {
+ struct userdata *u;
+
+ pa_assert(m);
+
+ u = m->userdata;
+ if (!u)
+ return;
+
+ if (u->sessions) {
+ pa_hashmap_free(u->sessions);
+ pa_hashmap_free(u->previous_sessions);
+ }
+
+ if (u->io)
+ m->core->mainloop->io_free(u->io);
+
+ if (u->monitor)
+ sd_login_monitor_unref(u->monitor);
+
+ pa_xfree(u);
+}
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