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1 /***
2     This file is part of PulseAudio.
3 
4     Copyright 2012 Lennart Poettering
5 
6     PulseAudio is free software; you can redistribute it and/or modify
7     it under the terms of the GNU Lesser General Public License as published
8     by the Free Software Foundation; either version 2.1 of the License,
9     or (at your option) any later version.
10 
11     PulseAudio is distributed in the hope that it will be useful, but
12     WITHOUT ANY WARRANTY; without even the implied warranty of
13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14     General Public License for more details.
15 
16     You should have received a copy of the GNU Lesser General Public License
17     along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18 ***/
19 
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23 
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <stdlib.h>
27 #include <errno.h>
28 #include <stdlib.h>
29 #include <sys/types.h>
30 
31 #include <systemd/sd-login.h>
32 
33 #include <pulse/xmalloc.h>
34 
35 #include <pulsecore/module.h>
36 #include <pulsecore/log.h>
37 #include <pulsecore/hashmap.h>
38 #include <pulsecore/idxset.h>
39 #include <pulsecore/modargs.h>
40 
41 PA_MODULE_AUTHOR("Lennart Poettering");
42 PA_MODULE_DESCRIPTION("Create a client for each login session of this user");
43 PA_MODULE_VERSION(PACKAGE_VERSION);
44 PA_MODULE_LOAD_ONCE(true);
45 
46 static const char* const valid_modargs[] = {
47     NULL
48 };
49 
50 struct session {
51     char *id;
52     pa_client *client;
53 };
54 
55 struct userdata {
56     pa_module *module;
57     pa_core *core;
58     pa_hashmap *sessions, *previous_sessions;
59     sd_login_monitor *monitor;
60     pa_io_event *io;
61 };
62 
add_session(struct userdata * u,const char * id)63 static int add_session(struct userdata *u, const char *id) {
64     struct session *session;
65     pa_client_new_data data;
66 
67     session = pa_xnew(struct session, 1);
68     session->id = pa_xstrdup(id);
69 
70     pa_client_new_data_init(&data);
71     data.module = u->module;
72     data.driver = __FILE__;
73     pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "Login Session %s", id);
74     pa_proplist_sets(data.proplist, "systemd-login.session", id);
75     session->client = pa_client_new(u->core, &data);
76     pa_client_new_data_done(&data);
77 
78     if (!session->client) {
79         pa_xfree(session->id);
80         pa_xfree(session);
81         return -1;
82     }
83 
84     pa_hashmap_put(u->sessions, session->id, session);
85 
86     pa_log_debug("Added new session %s", id);
87 
88     /* Positive exit_idle_time is only useful when we have no session tracking
89      * capability, so we can set it to 0 now that we have detected a session.
90      * The benefit of setting exit_idle_time to 0 is that pulseaudio will exit
91      * immediately when the session ends. That in turn is useful, because some
92      * systems (those that use pam_systemd but don't use systemd for managing
93      * pulseaudio) clean $XDG_RUNTIME_DIR on logout, but fail to terminate all
94      * services that depend on the files in $XDG_RUNTIME_DIR. The directory
95      * contains our sockets, and if the sockets are removed without terminating
96      * pulseaudio, a quick relogin will likely cause trouble, because a new
97      * instance will be spawned while the old instance is still running. */
98     if (u->core->exit_idle_time > 0)
99         pa_core_set_exit_idle_time(u->core, 0);
100 
101     return 0;
102 }
103 
free_session(struct session * session)104 static void free_session(struct session *session) {
105     pa_assert(session);
106 
107     pa_log_debug("Removing session %s", session->id);
108 
109     pa_client_free(session->client);
110     pa_xfree(session->id);
111     pa_xfree(session);
112 }
113 
get_session_list(struct userdata * u)114 static int get_session_list(struct userdata *u) {
115     int r;
116     char **sessions;
117     pa_hashmap *h;
118     struct session *o;
119 
120     pa_assert(u);
121 
122     r = sd_uid_get_sessions(getuid(), 0, &sessions);
123     if (r < 0)
124         return -1;
125 
126     /* We copy all sessions that still exist from one hashmap to the
127      * other and then flush the remaining ones */
128 
129     h = u->previous_sessions;
130     u->previous_sessions = u->sessions;
131     u->sessions = h;
132 
133     if (sessions) {
134         char **s;
135 
136         /* Note that the sessions array is allocated with libc's
137          * malloc()/free() calls, hence do not use pa_xfree() to free
138          * this here. */
139 
140         for (s = sessions; *s; s++) {
141             o = pa_hashmap_remove(u->previous_sessions, *s);
142             if (o)
143                 pa_hashmap_put(u->sessions, o->id, o);
144             else
145                 add_session(u, *s);
146 
147             free(*s);
148         }
149 
150         free(sessions);
151     }
152 
153     pa_hashmap_remove_all(u->previous_sessions);
154 
155     return 0;
156 }
157 
monitor_cb(pa_mainloop_api * a,pa_io_event * e,int fd,pa_io_event_flags_t events,void * userdata)158 static void monitor_cb(
159         pa_mainloop_api*a,
160         pa_io_event* e,
161         int fd,
162         pa_io_event_flags_t events,
163         void *userdata) {
164 
165     struct userdata *u = userdata;
166 
167     pa_assert(u);
168 
169     sd_login_monitor_flush(u->monitor);
170     get_session_list(u);
171 }
172 
pa__init(pa_module * m)173 int pa__init(pa_module *m) {
174     struct userdata *u = NULL;
175     pa_modargs *ma;
176     sd_login_monitor *monitor = NULL;
177     int r;
178 
179     pa_assert(m);
180 
181     /* If we are not actually running logind become a NOP */
182     if (access("/run/systemd/seats/", F_OK) < 0)
183         return 0;
184 
185     ma = pa_modargs_new(m->argument, valid_modargs);
186     if (!ma) {
187         pa_log("Failed to parse module arguments");
188         goto fail;
189     }
190 
191     r = sd_login_monitor_new("session", &monitor);
192     if (r < 0) {
193         pa_log("Failed to create session monitor: %s", strerror(-r));
194         goto fail;
195     }
196 
197     m->userdata = u = pa_xnew0(struct userdata, 1);
198     u->core = m->core;
199     u->module = m;
200     u->sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
201     u->previous_sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
202     u->monitor = monitor;
203 
204     u->io = u->core->mainloop->io_new(u->core->mainloop, sd_login_monitor_get_fd(monitor), PA_IO_EVENT_INPUT, monitor_cb, u);
205 
206     if (get_session_list(u) < 0)
207         goto fail;
208 
209     pa_modargs_free(ma);
210 
211     return 0;
212 
213 fail:
214     if (ma)
215         pa_modargs_free(ma);
216 
217     pa__done(m);
218 
219     return -1;
220 }
221 
pa__done(pa_module * m)222 void pa__done(pa_module *m) {
223     struct userdata *u;
224 
225     pa_assert(m);
226 
227     u = m->userdata;
228     if (!u)
229         return;
230 
231     if (u->sessions) {
232         pa_hashmap_free(u->sessions);
233         pa_hashmap_free(u->previous_sessions);
234     }
235 
236     if (u->io)
237         m->core->mainloop->io_free(u->io);
238 
239     if (u->monitor)
240         sd_login_monitor_unref(u->monitor);
241 
242     pa_xfree(u);
243 }
244