code.delx.au - pulseaudio/blob - src/modules/module-systemd-login.c

   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, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19     USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32
  33 #include <systemd/sd-login.h>
  34 #include <systemd/sd-daemon.h>
  35
  36 #include <pulse/xmalloc.h>
  37
  38 #include <pulsecore/module.h>
  39 #include <pulsecore/log.h>
  40 #include <pulsecore/hashmap.h>
  41 #include <pulsecore/idxset.h>
  42 #include <pulsecore/modargs.h>
  43
  44 #include "module-systemd-login-symdef.h"
  45
  46 PA_MODULE_AUTHOR("Lennart Poettering");
  47 PA_MODULE_DESCRIPTION("Create a client for each login session of this user");
  48 PA_MODULE_VERSION(PACKAGE_VERSION);
  49 PA_MODULE_LOAD_ONCE(TRUE);
  50
  51 static const char* const valid_modargs[] = {
  52     NULL
  53 };
  54
  55 struct session {
  56     char *id;
  57     pa_client *client;
  58 };
  59
  60 struct userdata {
  61     pa_module *module;
  62     pa_core *core;
  63     pa_hashmap *sessions, *previous_sessions;
  64     sd_login_monitor *monitor;
  65     pa_io_event *io;
  66 };
  67
  68 static int add_session(struct userdata *u, const char *id) {
  69     struct session *session;
  70     pa_client_new_data data;
  71
  72     session = pa_xnew(struct session, 1);
  73     session->id = pa_xstrdup(id);
  74
  75     pa_client_new_data_init(&data);
  76     data.module = u->module;
  77     data.driver = __FILE__;
  78     pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "Login Session %s", id);
  79     pa_proplist_sets(data.proplist, "systemd-login.session", id);
  80     session->client = pa_client_new(u->core, &data);
  81     pa_client_new_data_done(&data);
  82
  83     if (!session->client) {
  84         pa_xfree(session->id);
  85         pa_xfree(session);
  86         return -1;
  87     }
  88
  89     pa_hashmap_put(u->sessions, session->id, session);
  90
  91     pa_log_debug("Added new session %s", id);
  92     return 0;
  93 }
  94
  95 static void free_session(struct session *session) {
  96     pa_assert(session);
  97
  98     pa_log_debug("Removing session %s", session->id);
  99
 100     pa_client_free(session->client);
 101     pa_xfree(session->id);
 102     pa_xfree(session);
 103 }
 104
 105 static int get_session_list(struct userdata *u) {
 106     int r;
 107     char **sessions;
 108     pa_hashmap *h;
 109     struct session *o;
 110
 111     pa_assert(u);
 112
 113     r = sd_uid_get_sessions(getuid(), 0, &sessions);
 114     if (r < 0)
 115         return -1;
 116
 117     /* We copy all sessions that still exist from one hashmap to the
 118      * other and then flush the remaining ones */
 119
 120     h = u->previous_sessions;
 121     u->previous_sessions = u->sessions;
 122     u->sessions = h;
 123
 124     if (sessions) {
 125         char **s;
 126
 127         /* Note that the sessions array is allocated with libc's
 128          * malloc()/free() calls, hence do not use pa_xfree() to free
 129          * this here. */
 130
 131         for (s = sessions; *s; s++) {
 132             o = pa_hashmap_remove(u->previous_sessions, *s);
 133             if (o)
 134                 pa_hashmap_put(u->sessions, o->id, o);
 135             else
 136                 add_session(u, *s);
 137
 138             free(*s);
 139         }
 140
 141         free(sessions);
 142     }
 143
 144     pa_hashmap_remove_all(u->previous_sessions, (pa_free_cb_t) free_session);
 145
 146     return 0;
 147 }
 148
 149 static void monitor_cb(
 150         pa_mainloop_api*a,
 151         pa_io_event* e,
 152         int fd,
 153         pa_io_event_flags_t events,
 154         void *userdata) {
 155
 156     struct userdata *u = userdata;
 157
 158     pa_assert(u);
 159
 160     sd_login_monitor_flush(u->monitor);
 161     get_session_list(u);
 162 }
 163
 164 int pa__init(pa_module *m) {
 165     struct userdata *u = NULL;
 166     pa_modargs *ma;
 167     sd_login_monitor *monitor = NULL;
 168     int r;
 169
 170     pa_assert(m);
 171
 172     /* If we are not actually booting with systemd become a NOP */
 173     if (sd_booted() <= 0)
 174         return 0;
 175
 176     ma = pa_modargs_new(m->argument, valid_modargs);
 177     if (!ma) {
 178         pa_log("Failed to parse module arguments");
 179         goto fail;
 180     }
 181
 182     r = sd_login_monitor_new("session", &monitor);
 183     if (r < 0) {
 184         pa_log("Failed to create session monitor: %s", strerror(-r));
 185         goto fail;
 186     }
 187
 188     m->userdata = u = pa_xnew0(struct userdata, 1);
 189     u->core = m->core;
 190     u->module = m;
 191     u->sessions = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 192     u->previous_sessions = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 193     u->monitor = monitor;
 194
 195     u->io = u->core->mainloop->io_new(u->core->mainloop, sd_login_monitor_get_fd(monitor), PA_IO_EVENT_INPUT, monitor_cb, u);
 196
 197     if (get_session_list(u) < 0)
 198         goto fail;
 199
 200     pa_modargs_free(ma);
 201
 202     return 0;
 203
 204 fail:
 205     if (ma)
 206         pa_modargs_free(ma);
 207
 208     pa__done(m);
 209
 210     return -1;
 211 }
 212
 213 void pa__done(pa_module *m) {
 214     struct userdata *u;
 215     struct session *session;
 216
 217     pa_assert(m);
 218
 219     u = m->userdata;
 220     if (!u)
 221         return;
 222
 223     if (u->sessions) {
 224         pa_hashmap_free(u->sessions, (pa_free_cb_t) free_session);
 225         pa_hashmap_free(u->previous_sessions, (pa_free_cb_t) free_session);
 226     }
 227
 228     if (u->io)
 229         m->core->mainloop->io_free(u->io);
 230
 231     if (u->monitor)
 232         sd_login_monitor_unref(u->monitor);
 233
 234     pa_xfree(u);
 235 }