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136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/* PipeWire */
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/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
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/* SPDX-License-Identifier: MIT */
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#ifndef FLATPAK_UTILS_H
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#define FLATPAK_UTILS_H
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#ifdef HAVE_SYS_VFS_H
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#include <sys/vfs.h>
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#endif
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#include "config.h"
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#ifdef HAVE_GLIB2
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#include <glib.h>
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#endif
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#include <spa/utils/result.h>
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#include <pipewire/log.h>
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static int pw_check_flatpak_parse_metadata(const char *buf, size_t size, char **app_id, char **devices)
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{
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#ifdef HAVE_GLIB2
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/*
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* See flatpak-metadata(5)
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*
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* The .flatpak-info file is in GLib key_file .ini format.
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*/
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g_autoptr(GKeyFile) metadata = NULL;
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char *s;
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metadata = g_key_file_new();
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if (!g_key_file_load_from_data(metadata, buf, size, G_KEY_FILE_NONE, NULL))
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return -EINVAL;
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if (app_id) {
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s = g_key_file_get_value(metadata, "Application", "name", NULL);
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*app_id = s ? strdup(s) : NULL;
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g_free(s);
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}
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if (devices) {
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s = g_key_file_get_value(metadata, "Context", "devices", NULL);
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*devices = s ? strdup(s) : NULL;
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g_free(s);
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}
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return 0;
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#else
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return -ENOTSUP;
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#endif
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}
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static int pw_check_flatpak(pid_t pid, char **app_id, char **devices)
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{
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#if defined(__linux__)
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char root_path[2048];
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int root_fd, info_fd, res;
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struct stat stat_buf;
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if (app_id)
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*app_id = NULL;
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if (devices)
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*devices = NULL;
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snprintf(root_path, sizeof(root_path), "/proc/%d/root", (int)pid);
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root_fd = openat (AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
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if (root_fd == -1) {
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res = -errno;
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if (res == -EACCES) {
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struct statfs buf;
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/* Access to the root dir isn't allowed. This can happen if the root is on a fuse
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* filesystem, such as in a toolbox container. We will never have a fuse rootfs
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* in the flatpak case, so in that case its safe to ignore this and
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* continue to detect other types of apps. */
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if (statfs(root_path, &buf) == 0 &&
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buf.f_type == 0x65735546) /* FUSE_SUPER_MAGIC */
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return 0;
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}
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/* Not able to open the root dir shouldn't happen. Probably the app died and
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* we're failing due to /proc/$pid not existing. In that case fail instead
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* of treating this as privileged. */
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pw_log_info("failed to open \"%s\": %s", root_path, spa_strerror(res));
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return res;
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}
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info_fd = openat (root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
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close (root_fd);
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if (info_fd == -1) {
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if (errno == ENOENT) {
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pw_log_debug("no .flatpak-info, client on the host");
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/* No file => on the host */
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return 0;
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}
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res = -errno;
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pw_log_error("error opening .flatpak-info: %m");
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return res;
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}
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if (fstat (info_fd, &stat_buf) != 0 || !S_ISREG (stat_buf.st_mode)) {
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/* Some weird fd => failure, assume sandboxed */
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pw_log_error("error fstat .flatpak-info: %m");
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} else if (app_id || devices) {
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/* Parse the application ID if needed */
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const size_t size = stat_buf.st_size;
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if (size > 0) {
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void *buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, info_fd, 0);
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if (buf != MAP_FAILED) {
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res = pw_check_flatpak_parse_metadata(buf, size, app_id, devices);
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munmap(buf, size);
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} else {
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res = -errno;
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}
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} else {
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res = -EINVAL;
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}
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if (res == -EINVAL)
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pw_log_error("PID %d .flatpak-info file is malformed",
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(int)pid);
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else if (res < 0)
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pw_log_error("PID %d .flatpak-info parsing failed: %s",
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(int)pid, spa_strerror(res));
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}
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close(info_fd);
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return 1;
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#else
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return 0;
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#endif
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}
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#endif /* FLATPAK_UTILS_H */
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