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/*
* Copyright © 2014 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 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 <http://www.gnu.org/licenses/>.
*
* Authors:
* Alexander Larsson <alexl@redhat.com>
*
* Code borrowed from xdg-desktop-portal/src/xdp-utils.[ch]
*/
#include "config.h"
#include <glib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "tracker-portal-utils.h"
#define DBUS_NAME_DBUS "org.freedesktop.DBus"
#define DBUS_INTERFACE_DBUS DBUS_NAME_DBUS
#define DBUS_PATH_DBUS "/org/freedesktop/DBus"
static GKeyFile *
parse_app_info_from_flatpak_info (int pid, GError **error)
{
g_autofree char *root_path = NULL;
int root_fd = -1;
int info_fd = -1;
struct stat stat_buf;
g_autoptr(GError) local_error = NULL;
g_autoptr(GMappedFile) mapped = NULL;
g_autoptr(GKeyFile) metadata = NULL;
root_path = g_strdup_printf ("/proc/%u/root", pid);
root_fd = openat (AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
if (root_fd == -1) {
/* Not able to open the root dir shouldn't happen. Probably the app died and
* we're failing due to /proc/$pid not existing. In that case fail instead
* of treating this as privileged. */
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to open %s", root_path);
return NULL;
}
metadata = g_key_file_new ();
info_fd = openat (root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
close (root_fd);
if (info_fd == -1) {
if (errno == ENOENT) {
/* No file => on the host, return NULL with no error */
return NULL;
}
/* Some weird error => failure */
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to open application info file");
return NULL;
}
if (fstat (info_fd, &stat_buf) != 0 || !S_ISREG (stat_buf.st_mode)) {
/* Some weird fd => failure */
close (info_fd);
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Unable to open application info file");
return NULL;
}
mapped = g_mapped_file_new_from_fd (info_fd, FALSE, &local_error);
if (mapped == NULL) {
close (info_fd);
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Can't map .flatpak-info file: %s", local_error->message);
return NULL;
}
if (!g_key_file_load_from_data (metadata,
g_mapped_file_get_contents (mapped),
g_mapped_file_get_length (mapped),
G_KEY_FILE_NONE, &local_error)) {
close (info_fd);
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Can't load .flatpak-info file: %s", local_error->message);
return NULL;
}
close (info_fd);
return g_steal_pointer (&metadata);
}
static GKeyFile *
tracker_connection_lookup_app_info_sync (GDBusConnection *connection,
const char *sender,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GDBusMessage) msg = NULL;
g_autoptr(GDBusMessage) reply = NULL;
GVariant *body;
g_autoptr(GVariantIter) iter = NULL;
g_autoptr(GKeyFile) app_info = NULL;
const char *key;
GVariant *value;
g_autoptr(GError) local_error = NULL;
guint32 pid = 0;
msg = g_dbus_message_new_method_call (DBUS_NAME_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetConnectionCredentials");
g_dbus_message_set_body (msg, g_variant_new ("(s)", sender));
reply = g_dbus_connection_send_message_with_reply_sync (connection, msg,
G_DBUS_SEND_MESSAGE_FLAGS_NONE,
30000,
NULL,
cancellable,
error);
if (reply == NULL)
return NULL;
if (g_dbus_message_get_message_type (reply) == G_DBUS_MESSAGE_TYPE_ERROR) {
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Can't find peer app id");
return NULL;
}
body = g_dbus_message_get_body (reply);
g_variant_get (body, "(a{sv})", &iter);
while (g_variant_iter_loop (iter, "{&sv}", &key, &value)) {
if (strcmp (key, "ProcessID") == 0)
pid = g_variant_get_uint32 (value);
}
if (pid == 0) {
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Can't find app PID");
return NULL;
}
app_info = parse_app_info_from_flatpak_info (pid, &local_error);
if (app_info == NULL && local_error) {
g_propagate_error (error, g_steal_pointer (&local_error));
return NULL;
}
return g_steal_pointer (&app_info);
}
GKeyFile *
tracker_invocation_lookup_app_info_sync (GDBusMethodInvocation *invocation,
GCancellable *cancellable,
GError **error)
{
GDBusConnection *connection = g_dbus_method_invocation_get_connection (invocation);
const gchar *sender = g_dbus_method_invocation_get_sender (invocation);
return tracker_connection_lookup_app_info_sync (connection, sender, cancellable, error);
}
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