src/modules/module-x11-publish.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #include <X11/Xlib.h>
  34 #include <X11/Xatom.h>
  35
  36 #include <pulse/util.h>
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/sink.h>
  41 #include <pulsecore/core-scache.h>
  42 #include <pulsecore/modargs.h>
  43 #include <pulsecore/namereg.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/x11wrap.h>
  46 #include <pulsecore/core-util.h>
  47 #include <pulsecore/native-common.h>
  48 #include <pulsecore/authkey-prop.h>
  49 #include <pulsecore/authkey.h>
  50 #include <pulsecore/x11prop.h>
  51 #include <pulsecore/strlist.h>
  52 #include <pulsecore/props.h>
  53
  54 #include "module-x11-publish-symdef.h"
  55
  56 PA_MODULE_AUTHOR("Lennart Poettering")
  57 PA_MODULE_DESCRIPTION("X11 Credential Publisher")
  58 PA_MODULE_VERSION(PACKAGE_VERSION)
  59 PA_MODULE_USAGE("display=<X11 display>")
  60
  61 static const char* const valid_modargs[] = {
  62     "display",
  63     "sink",
  64     "source",
  65     "cookie",
  66     NULL
  67 };
  68
  69 struct userdata {
  70     pa_core *core;
  71     pa_x11_wrapper *x11_wrapper;
  72     char *id;
  73     uint8_t auth_cookie[PA_NATIVE_COOKIE_LENGTH];
  74     int auth_cookie_in_property;
  75 };
  76
  77 static int load_key(struct userdata *u, const char*fn) {
  78     pa_assert(u);
  79
  80     u->auth_cookie_in_property = 0;
  81
  82     if (!fn && pa_authkey_prop_get(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0) {
  83         pa_log_debug("using already loaded auth cookie.");
  84         pa_authkey_prop_ref(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME);
  85         u->auth_cookie_in_property = 1;
  86         return 0;
  87     }
  88
  89     if (!fn)
  90         fn = PA_NATIVE_COOKIE_FILE;
  91
  92     if (pa_authkey_load_auto(fn, u->auth_cookie, sizeof(u->auth_cookie)) < 0)
  93         return -1;
  94
  95     pa_log_debug("Loading cookie from disk.");
  96
  97     if (pa_authkey_prop_put(u->core, PA_NATIVE_COOKIE_PROPERTY_NAME, u->auth_cookie, sizeof(u->auth_cookie)) >= 0)
  98         u->auth_cookie_in_property = 1;
  99
 100     return 0;
 101 }
 102
 103 int pa__init(pa_module*m) {
 104     struct userdata *u;
 105     pa_modargs *ma = NULL;
 106     char hn[256], un[128];
 107     char hx[PA_NATIVE_COOKIE_LENGTH*2+1];
 108     const char *t;
 109     char *s;
 110     pa_strlist *l;
 111
 112     pa_assert(m);
 113
 114     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 115         pa_log("failed to parse module arguments");
 116         goto fail;
 117     }
 118
 119     m->userdata = u = pa_xmalloc(sizeof(struct userdata));
 120     u->core = m->core;
 121     u->id = NULL;
 122     u->auth_cookie_in_property = 0;
 123
 124     if (load_key(u, pa_modargs_get_value(ma, "cookie", NULL)) < 0)
 125         goto fail;
 126
 127     if (!(u->x11_wrapper = pa_x11_wrapper_get(m->core, pa_modargs_get_value(ma, "display", NULL))))
 128         goto fail;
 129
 130     if (!(l = pa_property_get(m->core, PA_NATIVE_SERVER_PROPERTY_NAME)))
 131         goto fail;
 132
 133     l = pa_strlist_reverse(l);
 134     s = pa_strlist_tostring(l);
 135     l = pa_strlist_reverse(l);
 136
 137     pa_x11_set_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SERVER", s);
 138     pa_xfree(s);
 139
 140     if (!pa_get_fqdn(hn, sizeof(hn)) || !pa_get_user_name(un, sizeof(un)))
 141         goto fail;
 142
 143     u->id = pa_sprintf_malloc("%s@%s/%u", un, hn, (unsigned) getpid());
 144     pa_x11_set_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_ID", u->id);
 145
 146     if ((t = pa_modargs_get_value(ma, "source", NULL)))
 147         pa_x11_set_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SOURCE", t);
 148
 149     if ((t = pa_modargs_get_value(ma, "sink", NULL)))
 150         pa_x11_set_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SINK", t);
 151
 152     pa_x11_set_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_COOKIE", pa_hexstr(u->auth_cookie, sizeof(u->auth_cookie), hx, sizeof(hx)));
 153
 154     pa_modargs_free(ma);
 155     return 0;
 156
 157 fail:
 158     if (ma)
 159         pa_modargs_free(ma);
 160
 161     pa__done(m);
 162     return -1;
 163 }
 164
 165 void pa__done(pa_module*m) {
 166     struct userdata*u;
 167
 168     pa_assert(m);
 169
 170     if (!(u = m->userdata))
 171         return;
 172
 173     if (u->x11_wrapper) {
 174         char t[256];
 175
 176         /* Yes, here is a race condition */
 177         if (!pa_x11_get_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_ID", t, sizeof(t)) || strcmp(t, u->id))
 178             pa_log_warn("PulseAudio information vanished from X11!");
 179         else {
 180             pa_x11_del_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_ID");
 181             pa_x11_del_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SERVER");
 182             pa_x11_del_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SINK");
 183             pa_x11_del_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_SOURCE");
 184             pa_x11_del_prop(pa_x11_wrapper_get_display(u->x11_wrapper), "PULSE_COOKIE");
 185             XSync(pa_x11_wrapper_get_display(u->x11_wrapper), False);
 186         }
 187     }
 188
 189     if (u->x11_wrapper)
 190         pa_x11_wrapper_unref(u->x11_wrapper);
 191
 192     if (u->auth_cookie_in_property)
 193         pa_authkey_prop_unref(m->core, PA_NATIVE_COOKIE_PROPERTY_NAME);
 194
 195     pa_xfree(u->id);
 196     pa_xfree(u);
 197 }