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