/* vi:set et sw=2 sts=2 cin cino=t0,f0,(0,{s,>2s,n-s,^-s,e-s:
* Copyright © 2014-2019 Red Hat, Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see .
*
* Authors:
* Alexander Larsson
*/
#include "config.h"
#include "flatpak-run-pulseaudio-private.h"
#include "flatpak-utils-private.h"
/* Try to find a default server from a pulseaudio confguration file */
static char *
flatpak_run_get_pulseaudio_server_user_config (const char *path)
{
g_autoptr(GFile) file = g_file_new_for_path (path);
g_autoptr(GError) my_error = NULL;
g_autoptr(GFileInputStream) input_stream = NULL;
g_autoptr(GDataInputStream) data_stream = NULL;
size_t len;
input_stream = g_file_read (file, NULL, &my_error);
if (my_error)
{
g_info ("Pulseaudio user configuration file '%s': %s", path, my_error->message);
return NULL;
}
data_stream = g_data_input_stream_new (G_INPUT_STREAM (input_stream));
while (TRUE)
{
g_autofree char *line = g_data_input_stream_read_line (data_stream, &len, NULL, NULL);
if (line == NULL)
break;
g_strchug (line);
if ((*line == '\0') || (*line == ';') || (*line == '#'))
continue;
if (g_str_has_prefix (line, ".include "))
{
g_autofree char *rec_path = g_strdup (line + 9);
g_strstrip (rec_path);
char *found = flatpak_run_get_pulseaudio_server_user_config (rec_path);
if (found)
return found;
}
else if (g_str_has_prefix (line, "["))
{
return NULL;
}
else
{
g_auto(GStrv) tokens = g_strsplit (line, "=", 2);
if ((tokens[0] != NULL) && (tokens[1] != NULL))
{
g_strchomp (tokens[0]);
if (strcmp ("default-server", tokens[0]) == 0)
{
g_strstrip (tokens[1]);
g_info ("Found pulseaudio socket from configuration file '%s': %s", path, tokens[1]);
return g_strdup (tokens[1]);
}
}
}
}
return NULL;
}
static char *
flatpak_run_get_pulseaudio_server (void)
{
const char * pulse_clientconfig;
char *pulse_server;
g_autofree char *pulse_user_config = NULL;
pulse_server = g_strdup (g_getenv ("PULSE_SERVER"));
if (pulse_server)
return pulse_server;
pulse_clientconfig = g_getenv ("PULSE_CLIENTCONFIG");
if (pulse_clientconfig)
return flatpak_run_get_pulseaudio_server_user_config (pulse_clientconfig);
pulse_user_config = g_build_filename (g_get_user_config_dir (), "pulse/client.conf", NULL);
pulse_server = flatpak_run_get_pulseaudio_server_user_config (pulse_user_config);
if (pulse_server)
return pulse_server;
pulse_server = flatpak_run_get_pulseaudio_server_user_config ("/etc/pulse/client.conf");
if (pulse_server)
return pulse_server;
return NULL;
}
/*
* Parse a PulseAudio server string, as documented on
* https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/ServerStrings/.
* Returns the first supported server address, or NULL if none are supported,
* or NULL with @remote set if @value points to a remote server.
*/
static char *
flatpak_run_parse_pulse_server (const char *value,
gboolean *remote)
{
g_auto(GStrv) servers = g_strsplit (value, " ", 0);
gsize i;
for (i = 0; servers[i] != NULL; i++)
{
const char *server = servers[i];
if (g_str_has_prefix (server, "{"))
{
/*
* TODO: compare the value within {} to the local hostname and D-Bus machine ID,
* and skip if it matches neither.
*/
const char * closing = strstr (server, "}");
if (closing == NULL)
continue;
server = closing + 1;
}
if (g_str_has_prefix (server, "unix:"))
return g_strdup (server + 5);
if (server[0] == '/')
return g_strdup (server);
if (g_str_has_prefix (server, "tcp:"))
{
*remote = TRUE;
return NULL;
}
}
return NULL;
}
/*
* Get the machine ID as used by PulseAudio. This is the systemd/D-Bus
* machine ID, or failing that, the hostname.
*/
static char *
flatpak_run_get_pulse_machine_id (void)
{
static const char * const machine_ids[] =
{
"/etc/machine-id",
"/var/lib/dbus/machine-id",
};
gsize i;
for (i = 0; i < G_N_ELEMENTS (machine_ids); i++)
{
g_autofree char *ret = NULL;
if (g_file_get_contents (machine_ids[i], &ret, NULL, NULL))
{
gsize j;
g_strstrip (ret);
for (j = 0; ret[j] != '\0'; j++)
{
if (!g_ascii_isxdigit (ret[j]))
break;
}
if (ret[0] != '\0' && ret[j] == '\0')
return g_steal_pointer (&ret);
}
}
return g_strdup (g_get_host_name ());
}
/*
* Get the directory used by PulseAudio for its configuration.
*/
static char *
flatpak_run_get_pulse_home (void)
{
/* Legacy path ~/.pulse is tried first, for compatibility */
{
const char *parent = g_get_home_dir ();
g_autofree char *ret = g_build_filename (parent, ".pulse", NULL);
if (g_file_test (ret, G_FILE_TEST_IS_DIR))
return g_steal_pointer (&ret);
}
/* The more modern path, usually ~/.config/pulse */
{
const char *parent = g_get_user_config_dir ();
/* Usually ~/.config/pulse */
g_autofree char *ret = g_build_filename (parent, "pulse", NULL);
if (g_file_test (ret, G_FILE_TEST_IS_DIR))
return g_steal_pointer (&ret);
}
return NULL;
}
/*
* Get the runtime directory used by PulseAudio for its socket.
*/
static char *
flatpak_run_get_pulse_runtime_dir (void)
{
const char *val = NULL;
val = g_getenv ("PULSE_RUNTIME_PATH");
if (val != NULL)
return realpath (val, NULL);
{
const char *user_runtime_dir = g_get_user_runtime_dir ();
if (user_runtime_dir != NULL)
{
g_autofree char *dir = g_build_filename (user_runtime_dir, "pulse", NULL);
if (g_file_test (dir, G_FILE_TEST_IS_DIR))
return realpath (dir, NULL);
}
}
{
g_autofree char *pulse_home = flatpak_run_get_pulse_home ();
g_autofree char *machine_id = flatpak_run_get_pulse_machine_id ();
if (pulse_home != NULL && machine_id != NULL)
{
/* This is usually a symlink, but we take its realpath() anyway */
g_autofree char *dir = g_strdup_printf ("%s/%s-runtime", pulse_home, machine_id);
if (g_file_test (dir, G_FILE_TEST_IS_DIR))
return realpath (dir, NULL);
}
}
return NULL;
}
void
flatpak_run_add_pulseaudio_args (FlatpakBwrap *bwrap,
FlatpakContextShares shares)
{
g_autofree char *pulseaudio_server = flatpak_run_get_pulseaudio_server ();
g_autofree char *pulseaudio_socket = NULL;
g_autofree char *pulse_runtime_dir = flatpak_run_get_pulse_runtime_dir ();
gboolean remote = FALSE;
if (pulseaudio_server)
pulseaudio_socket = flatpak_run_parse_pulse_server (pulseaudio_server,
&remote);
if (pulseaudio_socket == NULL && !remote)
{
pulseaudio_socket = g_build_filename (pulse_runtime_dir, "native", NULL);
if (!g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
g_clear_pointer (&pulseaudio_socket, g_free);
}
if (pulseaudio_socket == NULL && !remote)
{
pulseaudio_socket = realpath ("/var/run/pulse/native", NULL);
if (pulseaudio_socket && !g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
g_clear_pointer (&pulseaudio_socket, g_free);
}
flatpak_bwrap_unset_env (bwrap, "PULSE_SERVER");
if (remote)
{
if ((shares & FLATPAK_CONTEXT_SHARED_NETWORK) == 0)
{
g_warning ("Remote PulseAudio server configured.");
g_warning ("PulseAudio access will require --share=network permission.");
}
g_info ("Using remote PulseAudio server \"%s\"", pulseaudio_server);
flatpak_bwrap_set_env (bwrap, "PULSE_SERVER", pulseaudio_server, TRUE);
}
else if (pulseaudio_socket && g_file_test (pulseaudio_socket, G_FILE_TEST_EXISTS))
{
static const char sandbox_socket_path[] = "/run/flatpak/pulse/native";
static const char pulse_server[] = "unix:/run/flatpak/pulse/native";
static const char config_path[] = "/run/flatpak/pulse/config";
gboolean share_shm = FALSE; /* TODO: When do we add this? */
g_autofree char *client_config = g_strdup_printf ("enable-shm=%s\n", share_shm ? "yes" : "no");
/* FIXME - error handling */
if (!flatpak_bwrap_add_args_data (bwrap, "pulseaudio", client_config, -1, config_path, NULL))
return;
flatpak_bwrap_add_args (bwrap,
"--ro-bind", pulseaudio_socket, sandbox_socket_path,
NULL);
flatpak_bwrap_set_env (bwrap, "PULSE_SERVER", pulse_server, TRUE);
flatpak_bwrap_set_env (bwrap, "PULSE_CLIENTCONFIG", config_path, TRUE);
flatpak_bwrap_add_runtime_dir_member (bwrap, "pulse");
}
else
g_info ("Could not find pulseaudio socket");
/* Also allow ALSA access. This was added in 1.8, and is not ideally named. However,
* since the practical permission of ALSA and PulseAudio are essentially the same, and
* since we don't want to add more permissions for something we plan to replace with
* portals/pipewire going forward we reinterpret pulseaudio to also mean ALSA.
*/
if (!remote && g_file_test ("/dev/snd", G_FILE_TEST_IS_DIR))
flatpak_bwrap_add_args (bwrap, "--dev-bind", "/dev/snd", "/dev/snd", NULL);
}