code.delx.au - pulseaudio/blob - src/modules/x11/module-x11-publish.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 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 <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 #include <xcb/xcb.h>
  32
  33 #include <pulse/xmalloc.h>
  34
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/modargs.h>
  37 #include <pulsecore/log.h>
  38 #include <pulsecore/x11wrap.h>
  39 #include <pulsecore/core-util.h>
  40 #include <pulsecore/native-common.h>
  41 #include <pulsecore/auth-cookie.h>
  42 #include <pulsecore/x11prop.h>
  43 #include <pulsecore/strlist.h>
  44 #include <pulsecore/protocol-native.h>
  45
  46 #include "module-x11-publish-symdef.h"
  47
  48 PA_MODULE_AUTHOR("Lennart Poettering");
  49 PA_MODULE_DESCRIPTION("X11 credential publisher");
  50 PA_MODULE_VERSION(PACKAGE_VERSION);
  51 PA_MODULE_LOAD_ONCE(FALSE);
  52 PA_MODULE_USAGE(
  53         "display=<X11 display> "
  54         "sink=<Sink to publish> "
  55         "source=<Source to publish> "
  56         "cookie=<Cookie file to publish> ");
  57
  58 static const char* const valid_modargs[] = {
  59     "display",
  60     "sink",
  61     "source",
  62     "cookie",
  63     NULL
  64 };
  65
  66 struct userdata {
  67     pa_core *core;
  68     pa_module *module;
  69     pa_native_protocol *protocol;
  70
  71     char *id;
  72     pa_auth_cookie *auth_cookie;
  73
  74     pa_x11_wrapper *x11_wrapper;
  75     pa_x11_client *x11_client;
  76
  77     pa_hook_slot *hook_slot;
  78 };
  79
  80 static void publish_servers(struct userdata *u, pa_strlist *l) {
  81
  82     int screen = DefaultScreen(pa_x11_wrapper_get_display(u->x11_wrapper));
  83
  84     if (l) {
  85         char *s;
  86
  87         l = pa_strlist_reverse(l);
  88         s = pa_strlist_tostring(l);
  89         pa_strlist_reverse(l);
  90
  91         pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SERVER", s);
  92         pa_xfree(s);
  93     } else
  94         pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SERVER");
  95 }
  96
  97 static pa_hook_result_t servers_changed_cb(void *hook_data, void *call_data, void *slot_data) {
  98     pa_strlist *servers = call_data;
  99     struct userdata *u = slot_data;
 100     char t[256];
 101     int screen;
 102
 103     pa_assert(u);
 104
 105     screen = DefaultScreen(pa_x11_wrapper_get_display(u->x11_wrapper));
 106     if (!pa_x11_get_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_ID", t, sizeof(t)) || strcmp(t, u->id)) {
 107         pa_log_warn("PulseAudio information vanished from X11!");
 108         return PA_HOOK_OK;
 109     }
 110
 111     publish_servers(u, servers);
 112     return PA_HOOK_OK;
 113 }
 114
 115 static void x11_kill_cb(pa_x11_wrapper *w, void *userdata) {
 116     struct userdata *u = userdata;
 117
 118     pa_assert(w);
 119     pa_assert(u);
 120     pa_assert(u->x11_wrapper == w);
 121
 122     if (u->x11_client)
 123         pa_x11_client_free(u->x11_client);
 124
 125     if (u->x11_wrapper)
 126         pa_x11_wrapper_unref(u->x11_wrapper);
 127
 128     u->x11_client = NULL;
 129     u->x11_wrapper = NULL;
 130
 131     pa_module_unload_request(u->module, TRUE);
 132 }
 133
 134 int pa__init(pa_module*m) {
 135     struct userdata *u;
 136     pa_modargs *ma = NULL;
 137     char *mid, *sid;
 138     char hx[PA_NATIVE_COOKIE_LENGTH*2+1];
 139     const char *t;
 140     int screen;
 141
 142     pa_assert(m);
 143
 144     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 145         pa_log("failed to parse module arguments");
 146         goto fail;
 147     }
 148
 149     m->userdata = u = pa_xnew(struct userdata, 1);
 150     u->core = m->core;
 151     u->module = m;
 152     u->protocol = pa_native_protocol_get(m->core);
 153     u->id = NULL;
 154     u->auth_cookie = NULL;
 155     u->x11_client = NULL;
 156     u->x11_wrapper = NULL;
 157
 158     u->hook_slot = pa_hook_connect(&pa_native_protocol_hooks(u->protocol)[PA_NATIVE_HOOK_SERVERS_CHANGED], PA_HOOK_NORMAL, servers_changed_cb, u);
 159
 160     if (!(u->auth_cookie = pa_auth_cookie_get(m->core, pa_modargs_get_value(ma, "cookie", PA_NATIVE_COOKIE_FILE), TRUE, PA_NATIVE_COOKIE_LENGTH)))
 161         goto fail;
 162
 163     if (!(u->x11_wrapper = pa_x11_wrapper_get(m->core, pa_modargs_get_value(ma, "display", NULL))))
 164         goto fail;
 165
 166     screen = DefaultScreen(pa_x11_wrapper_get_display(u->x11_wrapper));
 167     mid = pa_machine_id();
 168     u->id = pa_sprintf_malloc("%lu@%s/%lu", (unsigned long) getuid(), mid, (unsigned long) getpid());
 169     pa_xfree(mid);
 170
 171     pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_ID", u->id);
 172
 173     if ((sid = pa_session_id())) {
 174         pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SESSION_ID", sid);
 175         pa_xfree(sid);
 176     }
 177
 178     publish_servers(u, pa_native_protocol_servers(u->protocol));
 179
 180     if ((t = pa_modargs_get_value(ma, "source", NULL)))
 181         pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SOURCE", t);
 182
 183     if ((t = pa_modargs_get_value(ma, "sink", NULL)))
 184         pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SINK", t);
 185
 186     pa_x11_set_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_COOKIE",
 187                     pa_hexstr(pa_auth_cookie_read(u->auth_cookie, PA_NATIVE_COOKIE_LENGTH), PA_NATIVE_COOKIE_LENGTH, hx, sizeof(hx)));
 188
 189     u->x11_client = pa_x11_client_new(u->x11_wrapper, NULL, x11_kill_cb, u);
 190
 191     pa_modargs_free(ma);
 192
 193     return 0;
 194
 195 fail:
 196     if (ma)
 197         pa_modargs_free(ma);
 198
 199     pa__done(m);
 200
 201     return -1;
 202 }
 203
 204 void pa__done(pa_module*m) {
 205     struct userdata*u;
 206
 207     pa_assert(m);
 208
 209     if (!(u = m->userdata))
 210         return;
 211
 212     if (u->x11_client)
 213         pa_x11_client_free(u->x11_client);
 214
 215     if (u->x11_wrapper) {
 216         char t[256];
 217         int screen = DefaultScreen(pa_x11_wrapper_get_display(u->x11_wrapper));
 218
 219         /* Yes, here is a race condition */
 220         if (!pa_x11_get_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_ID", t, sizeof(t)) || strcmp(t, u->id))
 221             pa_log_warn("PulseAudio information vanished from X11!");
 222         else {
 223             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_ID");
 224             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SERVER");
 225             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SINK");
 226             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SOURCE");
 227             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_COOKIE");
 228             pa_x11_del_prop(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper), screen, "PULSE_SESSION_ID");
 229             xcb_flush(pa_x11_wrapper_get_xcb_connection(u->x11_wrapper));
 230         }
 231
 232         pa_x11_wrapper_unref(u->x11_wrapper);
 233     }
 234
 235     if (u->auth_cookie)
 236         pa_auth_cookie_unref(u->auth_cookie);
 237
 238     if (u->hook_slot)
 239         pa_hook_slot_free(u->hook_slot);
 240
 241     if (u->protocol)
 242         pa_native_protocol_unref(u->protocol);
 243
 244     pa_xfree(u->id);
 245     pa_xfree(u);
 246 }