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xdp-utils.c
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xdp-utils.c
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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>
*/
#include "config.h"
#include <json-glib/json-glib.h>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <sys/vfs.h>
#include <gio/gdesktopappinfo.h>
#include "xdp-utils.h"
#define DBUS_NAME_DBUS "org.freedesktop.DBus"
#define DBUS_INTERFACE_DBUS DBUS_NAME_DBUS
#define DBUS_PATH_DBUS "/org/freedesktop/DBus"
G_LOCK_DEFINE (app_infos);
static GHashTable *app_info_by_unique_name;
/* Based on g_mkstemp from glib */
gint
xdp_mkstempat (int dir_fd,
gchar *tmpl,
int flags,
int mode)
{
char *XXXXXX;
int count, fd;
static const char letters[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
static const int NLETTERS = sizeof (letters) - 1;
glong value;
GTimeVal tv;
static int counter = 0;
g_return_val_if_fail (tmpl != NULL, -1);
/* find the last occurrence of "XXXXXX" */
XXXXXX = g_strrstr (tmpl, "XXXXXX");
if (!XXXXXX || strncmp (XXXXXX, "XXXXXX", 6))
{
errno = EINVAL;
return -1;
}
/* Get some more or less random data. */
g_get_current_time (&tv);
value = (tv.tv_usec ^ tv.tv_sec) + counter++;
for (count = 0; count < 100; value += 7777, ++count)
{
glong v = value;
/* Fill in the random bits. */
XXXXXX[0] = letters[v % NLETTERS];
v /= NLETTERS;
XXXXXX[1] = letters[v % NLETTERS];
v /= NLETTERS;
XXXXXX[2] = letters[v % NLETTERS];
v /= NLETTERS;
XXXXXX[3] = letters[v % NLETTERS];
v /= NLETTERS;
XXXXXX[4] = letters[v % NLETTERS];
v /= NLETTERS;
XXXXXX[5] = letters[v % NLETTERS];
fd = openat (dir_fd, tmpl, flags | O_CREAT | O_EXCL, mode);
if (fd >= 0)
return fd;
else if (errno != EEXIST)
/* Any other error will apply also to other names we might
* try, and there are 2^32 or so of them, so give up now.
*/
return -1;
}
/* We got out of the loop because we ran out of combinations to try. */
errno = EEXIST;
return -1;
}
typedef enum
{
XDP_APP_INFO_KIND_HOST = 0,
XDP_APP_INFO_KIND_FLATPAK = 1,
XDP_APP_INFO_KIND_SNAP = 2,
} XdpAppInfoKind;
struct _XdpAppInfo {
volatile gint ref_count;
char *id;
XdpAppInfoKind kind;
union
{
struct
{
GKeyFile *keyfile;
/* pid namespace mapping */
GMutex *pidns_lock;
ino_t pidns_id;
} flatpak;
struct
{
GKeyFile *keyfile;
} snap;
} u;
};
static XdpAppInfo *
xdp_app_info_new (XdpAppInfoKind kind)
{
XdpAppInfo *app_info = g_new0 (XdpAppInfo, 1);
app_info->ref_count = 1;
app_info->kind = kind;
return app_info;
}
static XdpAppInfo *
xdp_app_info_new_host (void)
{
XdpAppInfo *app_info = xdp_app_info_new (XDP_APP_INFO_KIND_HOST);
app_info->id = g_strdup ("");
return app_info;
}
static void
xdp_app_info_free (XdpAppInfo *app_info)
{
g_free (app_info->id);
switch (app_info->kind)
{
case XDP_APP_INFO_KIND_FLATPAK:
g_clear_pointer (&app_info->u.flatpak.keyfile, g_key_file_free);
break;
case XDP_APP_INFO_KIND_SNAP:
g_clear_pointer (&app_info->u.snap.keyfile, g_key_file_free);
break;
case XDP_APP_INFO_KIND_HOST:
default:
break;
}
g_free (app_info);
}
XdpAppInfo *
xdp_app_info_ref (XdpAppInfo *app_info)
{
g_return_val_if_fail (app_info != NULL, NULL);
g_atomic_int_inc (&app_info->ref_count);
return app_info;
}
void
xdp_app_info_unref (XdpAppInfo *app_info)
{
g_return_if_fail (app_info != NULL);
if (g_atomic_int_dec_and_test (&app_info->ref_count))
xdp_app_info_free (app_info);
}
const char *
xdp_app_info_get_id (XdpAppInfo *app_info)
{
g_return_val_if_fail (app_info != NULL, NULL);
return app_info->id;
}
GAppInfo *
xdp_app_info_load_app_info (XdpAppInfo *app_info)
{
g_autofree char *desktop_id = NULL;
g_return_val_if_fail (app_info != NULL, NULL);
switch (app_info->kind)
{
case XDP_APP_INFO_KIND_FLATPAK:
desktop_id = g_strconcat (app_info->id, ".desktop", NULL);
break;
case XDP_APP_INFO_KIND_SNAP:
desktop_id = g_key_file_get_string (app_info->u.snap.keyfile,
SNAP_METADATA_GROUP_INFO,
SNAP_METADATA_KEY_DESKTOP_FILE,
NULL);
break;
case XDP_APP_INFO_KIND_HOST:
default:
desktop_id = NULL;
break;
}
if (desktop_id == NULL)
return NULL;
return G_APP_INFO (g_desktop_app_info_new (desktop_id));
}
char **
xdp_app_info_rewrite_commandline (XdpAppInfo *app_info,
const char * const *commandline)
{
g_return_val_if_fail (app_info != NULL, NULL);
if (app_info->kind == XDP_APP_INFO_KIND_HOST)
{
return g_strdupv ((char **)commandline);
}
else if (app_info->kind == XDP_APP_INFO_KIND_FLATPAK)
{
g_autoptr(GPtrArray) args = NULL;
args = g_ptr_array_new_with_free_func (g_free);
g_ptr_array_add (args, g_strdup ("flatpak"));
g_ptr_array_add (args, g_strdup ("run"));
if (commandline && commandline[0])
{
int i;
g_ptr_array_add (args, g_strdup_printf ("--command=%s", commandline[0]));
g_ptr_array_add (args, g_strdup (app_info->id));
for (i = 1; commandline[i]; i++)
g_ptr_array_add (args, g_strdup (commandline[i]));
}
else
g_ptr_array_add (args, g_strdup (app_info->id));
g_ptr_array_add (args, NULL);
return (char **)g_ptr_array_free (g_steal_pointer (&args), FALSE);
}
else
return NULL;
}
char *
xdp_app_info_get_instance (XdpAppInfo *app_info)
{
g_return_val_if_fail (app_info != NULL, NULL);
if (app_info->kind != XDP_APP_INFO_KIND_FLATPAK)
return NULL;
return g_key_file_get_string (app_info->u.flatpak.keyfile,
FLATPAK_METADATA_GROUP_INSTANCE,
FLATPAK_METADATA_KEY_INSTANCE_ID,
NULL);
}
gboolean
xdp_app_info_is_host (XdpAppInfo *app_info)
{
g_return_val_if_fail (app_info != NULL, FALSE);
return app_info->kind == XDP_APP_INFO_KIND_HOST;
}
gboolean
xdp_app_info_supports_opath (XdpAppInfo *app_info)
{
return
app_info->kind == XDP_APP_INFO_KIND_FLATPAK ||
app_info->kind == XDP_APP_INFO_KIND_HOST;
}
char *
xdp_app_info_remap_path (XdpAppInfo *app_info,
const char *path)
{
if (app_info->kind == XDP_APP_INFO_KIND_FLATPAK)
{
g_autofree char *app_path = g_key_file_get_string (app_info->u.flatpak.keyfile,
FLATPAK_METADATA_GROUP_INSTANCE,
FLATPAK_METADATA_KEY_APP_PATH, NULL);
g_autofree char *runtime_path = g_key_file_get_string (app_info->u.flatpak.keyfile,
FLATPAK_METADATA_GROUP_INSTANCE,
FLATPAK_METADATA_KEY_RUNTIME_PATH,
NULL);
/* For apps we translate /app and /usr to the installed locations.
Also, we need to rewrite to drop the /newroot prefix added by
bubblewrap for other files to work. See
https://github.com/projectatomic/bubblewrap/pull/172
for a bit more information on the /newroot issue.
*/
if (g_str_has_prefix (path, "/newroot/"))
path = path + strlen ("/newroot");
if (app_path != NULL && g_str_has_prefix (path, "/app/"))
return g_build_filename (app_path, path + strlen ("/app/"), NULL);
else if (runtime_path != NULL && g_str_has_prefix (path, "/usr/"))
return g_build_filename (runtime_path, path + strlen ("/usr/"), NULL);
else if (g_str_has_prefix (path, "/run/host/usr/"))
return g_build_filename ("/usr", path + strlen ("/run/host/usr/"), NULL);
else if (g_str_has_prefix (path, "/run/host/etc/"))
return g_build_filename ("/etc", path + strlen ("/run/host/etc/"), NULL);
else if (g_str_has_prefix (path, "/run/flatpak/app/"))
return g_build_filename (g_get_user_runtime_dir (), "app",
path + strlen ("/run/flatpak/app/"), NULL);
else if (g_str_has_prefix (path, "/var/config/"))
return g_build_filename (g_get_home_dir (), ".var", "app",
app_info->id, "config",
path + strlen ("/var/config/"), NULL);
else if (g_str_has_prefix (path, "/var/data/"))
return g_build_filename (g_get_home_dir (), ".var", "app",
app_info->id, "data",
path + strlen ("/var/data/"), NULL);
}
return g_strdup (path);
}
gboolean
xdp_app_info_has_network (XdpAppInfo *app_info)
{
gboolean has_network;
switch (app_info->kind)
{
case XDP_APP_INFO_KIND_FLATPAK:
{
g_auto(GStrv) shared = g_key_file_get_string_list (app_info->u.flatpak.keyfile,
"Context", "shared",
NULL, NULL);
if (shared)
has_network = g_strv_contains ((const char * const *)shared, "network");
else
has_network = FALSE;
}
break;
case XDP_APP_INFO_KIND_SNAP:
has_network = g_key_file_get_boolean (app_info->u.snap.keyfile,
SNAP_METADATA_GROUP_INFO,
SNAP_METADATA_KEY_NETWORK, NULL);
break;
case XDP_APP_INFO_KIND_HOST:
default:
has_network = TRUE;
break;
}
return has_network;
}
static void
ensure_app_info_by_unique_name (void)
{
if (app_info_by_unique_name == NULL)
app_info_by_unique_name = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free,
(GDestroyNotify)xdp_app_info_unref);
}
/* Returns NULL with error set on failure, NULL with no error set if not a flatpak, and app-info otherwise */
static XdpAppInfo *
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;
g_autoptr(XdpAppInfo) app_info = NULL;
const char *group;
g_autofree char *id = 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)
{
if (errno == EACCES)
{
struct statfs buf;
/* Access to the root dir isn't allowed. This can happen if the root is on a fuse
* filesystem, such as in a toolbox container. We will never have a fuse rootfs
* in the flatpak case, so in that case its safe to ignore this and
* continue to detect other types of apps.
*/
if (statfs (root_path, &buf) == 0 &&
buf.f_type == 0x65735546) /* FUSE_SUPER_MAGIC */
return NULL;
}
/* Otherwise, we should be able to open the root dir. 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;
}
group = "Application";
if (g_key_file_has_group (metadata, "Runtime"))
group = "Runtime";
id = g_key_file_get_string (metadata, group, "name", error);
if (id == NULL)
{
close (info_fd);
return NULL;
}
close (info_fd);
app_info = xdp_app_info_new (XDP_APP_INFO_KIND_FLATPAK);
app_info->id = g_steal_pointer (&id);
app_info->u.flatpak.keyfile = g_steal_pointer (&metadata);
return g_steal_pointer (&app_info);
}
int
_xdp_parse_cgroup_file (FILE *f, gboolean *is_snap)
{
ssize_t n;
g_autofree char *id = NULL;
g_autofree char *controller = NULL;
g_autofree char *cgroup = NULL;
size_t id_len = 0, controller_len = 0, cgroup_len = 0;
g_return_val_if_fail(f != NULL, -1);
g_return_val_if_fail(is_snap != NULL, -1);
*is_snap = FALSE;
do
{
n = getdelim (&id, &id_len, ':', f);
if (n == -1) break;
n = getdelim (&controller, &controller_len, ':', f);
if (n == -1) break;
n = getdelim (&cgroup, &cgroup_len, '\n', f);
if (n == -1) break;
/* Only consider the freezer, systemd group or unified cgroup
* hierarchies */
if ((!strcmp (controller, "freezer:") != 0 ||
!strcmp (controller, "name=systemd:") != 0 ||
!strcmp (controller, ":") != 0) &&
strstr (cgroup, "/snap.") != NULL)
{
*is_snap = TRUE;
break;
}
}
while (n >= 0);
if (n < 0 && !feof(f)) return -1;
return 0;
}
static gboolean
pid_is_snap (pid_t pid, GError **error)
{
g_autofree char *cgroup_path = NULL;;
int fd;
FILE *f = NULL;
gboolean is_snap = FALSE;
int err = 0;
g_return_val_if_fail(pid > 0, FALSE);
cgroup_path = g_strdup_printf ("/proc/%u/cgroup", (guint) pid);
fd = open (cgroup_path, O_RDONLY | O_CLOEXEC | O_NOCTTY);
if (fd == -1)
{
err = errno;
goto end;
}
f = fdopen (fd, "r");
if (f == NULL)
{
err = errno;
goto end;
}
fd = -1; /* fd is now owned by f */
if (_xdp_parse_cgroup_file (f, &is_snap) == -1)
err = errno;
fclose (f);
end:
/* Silence ENOENT, treating it as "not a snap" */
if (err != 0 && err != ENOENT)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (err),
"Could not parse cgroup info for pid %u: %s", (guint) pid,
g_strerror (err));
}
return is_snap;
}
/* Returns NULL with error set on failure, NULL with no error set if not a snap, and app-info otherwise */
static XdpAppInfo *
parse_app_info_from_snap (pid_t pid, GError **error)
{
g_autoptr(GError) local_error = NULL;
g_autofree char *pid_str = NULL;
const char *argv[] = { "snap", "routine", "portal-info", NULL, NULL };
g_autofree char *output = NULL;
g_autoptr(GKeyFile) metadata = NULL;
g_autoptr(XdpAppInfo) app_info = NULL;
g_autofree char *snap_name = NULL;
/* Check the process's cgroup membership to fail quickly for non-snaps */
if (!pid_is_snap (pid, error)) return NULL;
pid_str = g_strdup_printf ("%u", (guint) pid);
argv[3] = pid_str;
if (!xdp_spawnv (NULL, &output, 0, error, argv))
{
return NULL;
}
metadata = g_key_file_new ();
if (!g_key_file_load_from_data (metadata, output, -1, G_KEY_FILE_NONE, &local_error))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"Can't read snap info for pid %u: %s", pid, local_error->message);
return NULL;
}
snap_name = g_key_file_get_string (metadata, SNAP_METADATA_GROUP_INFO,
SNAP_METADATA_KEY_INSTANCE_NAME, error);
if (snap_name == NULL)
{
return NULL;
}
app_info = xdp_app_info_new (XDP_APP_INFO_KIND_SNAP);
app_info->id = g_strconcat ("snap.", snap_name, NULL);
app_info->u.snap.keyfile = g_steal_pointer (&metadata);
return g_steal_pointer (&app_info);
}
XdpAppInfo *
xdp_get_app_info_from_pid (pid_t pid,
GError **error)
{
g_autoptr(XdpAppInfo) app_info = NULL;
g_autoptr(GError) local_error = 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;
}
if (app_info == NULL)
{
app_info = parse_app_info_from_snap (pid, &local_error);
if (app_info == NULL && local_error)
{
g_propagate_error (error, g_steal_pointer (&local_error));
return NULL;
}
}
if (app_info == NULL)
app_info = xdp_app_info_new_host ();
return g_steal_pointer (&app_info);
}
static XdpAppInfo *
lookup_cached_app_info_by_sender (const char *sender)
{
XdpAppInfo *app_info = NULL;
G_LOCK (app_infos);
if (app_info_by_unique_name)
{
app_info = g_hash_table_lookup (app_info_by_unique_name, sender);
if (app_info)
xdp_app_info_ref (app_info);
}
G_UNLOCK (app_infos);
return app_info;
}
static XdpAppInfo *
xdp_connection_lookup_app_info_sync (GDBusConnection *connection,
const char *sender,
GCancellable *cancellable,
GError **error)
{
g_autoptr(GDBusMessage) msg = NULL;
g_autoptr(GDBusMessage) reply = NULL;
g_autoptr(XdpAppInfo) app_info = NULL;
GVariant *body;
guint32 pid = 0;
app_info = lookup_cached_app_info_by_sender (sender);
if (app_info)
return g_steal_pointer (&app_info);
msg = g_dbus_message_new_method_call (DBUS_NAME_DBUS,
DBUS_PATH_DBUS,
DBUS_INTERFACE_DBUS,
"GetConnectionUnixProcessID");
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, "(u)", &pid);
app_info = xdp_get_app_info_from_pid (pid, error);
if (app_info == NULL)
return NULL;
G_LOCK (app_infos);
ensure_app_info_by_unique_name ();
g_hash_table_insert (app_info_by_unique_name, g_strdup (sender),
xdp_app_info_ref (app_info));
G_UNLOCK (app_infos);
return g_steal_pointer (&app_info);
}
XdpAppInfo *
xdp_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 xdp_connection_lookup_app_info_sync (connection, sender, cancellable, error);
}
static void
name_owner_changed (GDBusConnection *connection,
const gchar *sender_name,
const gchar *object_path,
const gchar *interface_name,
const gchar *signal_name,
GVariant *parameters,
gpointer user_data)
{
const char *name, *from, *to;
XdpPeerDiedCallback peer_died_cb = user_data;
g_variant_get (parameters, "(&s&s&s)", &name, &from, &to);
if (name[0] == ':' &&
strcmp (name, from) == 0 &&
strcmp (to, "") == 0)
{
G_LOCK (app_infos);
if (app_info_by_unique_name)
g_hash_table_remove (app_info_by_unique_name, name);
G_UNLOCK (app_infos);
if (peer_died_cb)
peer_died_cb (name);
}
}
void
xdp_connection_track_name_owners (GDBusConnection *connection,
XdpPeerDiedCallback peer_died_cb)
{
g_dbus_connection_signal_subscribe (connection,
DBUS_NAME_DBUS,
DBUS_INTERFACE_DBUS,
"NameOwnerChanged",
DBUS_PATH_DBUS,
NULL,
G_DBUS_SIGNAL_FLAGS_NONE,
name_owner_changed,
peer_died_cb, NULL);
}
gboolean
xdp_filter_options (GVariant *options,
GVariantBuilder *filtered,
XdpOptionKey *supported_options,
int n_supported_options,
GError **error)
{
int i;
gboolean ret = TRUE;
for (i = 0; i < n_supported_options; i++)
{
g_autoptr(GVariant) value = NULL;
value = g_variant_lookup_value (options,
supported_options[i].key,
supported_options[i].type);
if (!value)
{
value = g_variant_lookup_value (options, supported_options[i].key, NULL);
if (value)
{
if (*error == NULL)
g_set_error (error, XDG_DESKTOP_PORTAL_ERROR, XDG_DESKTOP_PORTAL_ERROR_INVALID_ARGUMENT,
"Expected type '%s' for option '%s', got '%s'",
g_variant_type_peek_string (supported_options[i].type),
supported_options[i].key,
g_variant_type_peek_string (g_variant_get_type (value)));
ret = FALSE;
}
continue;
}
if (supported_options[i].validate)
{
g_autoptr(GError) local_error = NULL;
if (!supported_options[i].validate (supported_options[i].key, value, options, &local_error))
{
if (ret)
{
ret = FALSE;
if (error && *error == NULL)
{
g_propagate_error (error, local_error);
local_error = NULL;
}
}
continue;
}
}
g_variant_builder_add (filtered, "{sv}", supported_options[i].key, g_steal_pointer (&value));
}
return ret;
}
static const GDBusErrorEntry xdg_desktop_portal_error_entries[] = {
{ XDG_DESKTOP_PORTAL_ERROR_FAILED, "org.freedesktop.portal.Error.Failed" },
{ XDG_DESKTOP_PORTAL_ERROR_INVALID_ARGUMENT, "org.freedesktop.portal.Error.InvalidArgument" },
{ XDG_DESKTOP_PORTAL_ERROR_NOT_FOUND, "org.freedesktop.portal.Error.NotFound" },
{ XDG_DESKTOP_PORTAL_ERROR_EXISTS, "org.freedesktop.portal.Error.Exists" },
{ XDG_DESKTOP_PORTAL_ERROR_NOT_ALLOWED, "org.freedesktop.portal.Error.NotAllowed" },
{ XDG_DESKTOP_PORTAL_ERROR_CANCELLED, "org.freedesktop.portal.Error.Cancelled" },
{ XDG_DESKTOP_PORTAL_ERROR_WINDOW_DESTROYED, "org.freedesktop.portal.Error.WindowDestroyed" }
};
GQuark
xdg_desktop_portal_error_quark (void)
{
static volatile gsize quark_volatile = 0;
g_dbus_error_register_error_domain ("xdg-desktop-portal-error-quark",
&quark_volatile,
xdg_desktop_portal_error_entries,
G_N_ELEMENTS (xdg_desktop_portal_error_entries));
return (GQuark) quark_volatile;
}
static char *
verify_proc_self_fd (XdpAppInfo *app_info,
const char *proc_path,
GError **error)
{
char path_buffer[PATH_MAX + 1];
ssize_t symlink_size;
int saved_errno;
symlink_size = readlink (proc_path, path_buffer, PATH_MAX);
if (symlink_size < 0)
{
saved_errno = errno;
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (saved_errno),
"readlink %s: %s", proc_path, g_strerror (saved_errno));
return NULL;
}
path_buffer[symlink_size] = 0;
/* All normal paths start with /, but some weird things
don't, such as socket:[27345] or anon_inode:[eventfd].
We don't support any of these */
if (path_buffer[0] != '/')
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_FILENAME,
"Not a regular file or directory: %s", path_buffer);
return NULL;
}
/* File descriptors to actually deleted files have " (deleted)"
appended to them. This also happens to some fake fd types
like shmem which are "/<name> (deleted)". All such
files are considered invalid. Unfortunatelly this also
matches files with filenames that actually end in " (deleted)",
but there is not much to do about this. */
if (g_str_has_suffix (path_buffer, " (deleted)"))
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_FILENAME,
"Cannot share deleted file: %s", path_buffer);
return NULL;
}
/* remap from sandbox to host if needed */
return xdp_app_info_remap_path (app_info, path_buffer);
}
static char *documents_mountpoint = NULL;
void
xdp_set_documents_mountpoint (const char *path)
{
g_clear_pointer (&documents_mountpoint, g_free);
documents_mountpoint = g_strdup (path);
}
/* alternate_document_path converts a file path */
char *
xdp_get_alternate_document_path (const char *path, const char *app_id)
{
int len;
/* If we don't know where the document portal is mounted, then there
* is no alternate path */
if (documents_mountpoint == NULL)
return NULL;
/* If the path is not within the document portal, then there is no
* alternative path */
len = strlen (documents_mountpoint);
if (!g_str_has_prefix (path, documents_mountpoint) || path[len] != '/')
return NULL;
return g_strconcat (documents_mountpoint, "/by-app/", app_id, &path[len], NULL);
}
static gboolean
check_same_file (const char *path,
struct stat *expected_st_buf,
GError **error)
{
struct stat real_st_buf;
int saved_errno;
if (stat (path, &real_st_buf) < 0)
{
saved_errno = errno;
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (saved_errno),
"stat %s: %s", path, g_strerror (saved_errno));
return FALSE;
}
if (expected_st_buf->st_dev != real_st_buf.st_dev ||
expected_st_buf->st_ino != real_st_buf.st_ino)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
"\"%s\" identity (%ju,%ju) does not match expected (%ju,%ju)",
path,
(uintmax_t) expected_st_buf->st_dev,
(uintmax_t) expected_st_buf->st_ino,
(uintmax_t) real_st_buf.st_dev,
(uintmax_t) real_st_buf.st_ino);
return FALSE;
}
return TRUE;
}
char *
xdp_app_info_get_path_for_fd (XdpAppInfo *app_info,
int fd,
int require_st_mode,
struct stat *st_buf,
gboolean *writable_out,
GError **error)
{
g_autofree char *proc_path = NULL;
int fd_flags;
struct stat st_buf_store;
gboolean writable = FALSE;
g_autofree char *path = NULL;
int saved_errno;
if (st_buf == NULL)
st_buf = &st_buf_store;
if (fd == -1)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"Invalid file descriptor");
return NULL;
}
/* Must be able to get fd flags */