Adding upstream version 0.3.65.upstream/0.3.65upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 156 insertions, 0 deletions

diff --git a/src/modules/flatpak-utils.h b/src/modules/flatpak-utils.h
new file mode 100644
index 0000000..8952ac4
--- /dev/null
+++ b/src/modules/flatpak-utils.h
@@ -0,0 +1,156 @@
+/* PipeWire
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef FLATPAK_UTILS_H
+#define FLATPAK_UTILS_H
+
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_VFS_H
+#include <sys/vfs.h>
+#endif
+
+#include "config.h"
+
+#ifdef HAVE_GLIB2
+#include <glib.h>
+#endif
+
+#include <spa/utils/result.h>
+#include <pipewire/log.h>
+
+static int pw_check_flatpak_parse_metadata(const char *buf, size_t size, char **app_id, char **devices)
+{
+#ifdef HAVE_GLIB2
+	/*
+	 * See flatpak-metadata(5)
+	 *
+	 * The .flatpak-info file is in GLib key_file .ini format.
+	 */
+	g_autoptr(GKeyFile) metadata = NULL;
+	char *s;
+
+	metadata = g_key_file_new();
+	if (!g_key_file_load_from_data(metadata, buf, size, G_KEY_FILE_NONE, NULL))
+		return -EINVAL;
+
+	if (app_id) {
+		s = g_key_file_get_value(metadata, "Application", "name", NULL);
+		*app_id = s ? strdup(s) : NULL;
+		g_free(s);
+	}
+
+	if (devices) {
+		s = g_key_file_get_value(metadata, "Context", "devices", NULL);
+		*devices = s ? strdup(s) : NULL;
+		g_free(s);
+	}
+
+	return 0;
+#else
+	return -ENOTSUP;
+#endif
+}
+
+static int pw_check_flatpak(pid_t pid, char **app_id, char **devices)
+{
+#if defined(__linux__)
+	char root_path[2048];
+	int root_fd, info_fd, res;
+	struct stat stat_buf;
+
+	if (app_id)
+		*app_id = NULL;
+	if (devices)
+		*devices = NULL;
+
+	snprintf(root_path, sizeof(root_path), "/proc/%d/root", (int)pid);
+	root_fd = openat (AT_FDCWD, root_path, O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_CLOEXEC | O_NOCTTY);
+	if (root_fd == -1) {
+		res = -errno;
+		if (res == -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 0;
+		}
+		/* 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. */
+		pw_log_info("failed to open \"%s\": %s", root_path, spa_strerror(res));
+		return res;
+	}
+	info_fd = openat (root_fd, ".flatpak-info", O_RDONLY | O_CLOEXEC | O_NOCTTY);
+	close (root_fd);
+	if (info_fd == -1) {
+		if (errno == ENOENT) {
+			pw_log_debug("no .flatpak-info, client on the host");
+			/* No file => on the host */
+			return 0;
+		}
+		res = -errno;
+		pw_log_error("error opening .flatpak-info: %m");
+		return res;
+        }
+	if (fstat (info_fd, &stat_buf) != 0 || !S_ISREG (stat_buf.st_mode)) {
+		/* Some weird fd => failure, assume sandboxed */
+		pw_log_error("error fstat .flatpak-info: %m");
+	} else if (app_id || devices) {
+		/* Parse the application ID if needed */
+		const size_t size = stat_buf.st_size;
+
+		if (size > 0) {
+			void *buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, info_fd, 0);
+			if (buf != MAP_FAILED) {
+				res = pw_check_flatpak_parse_metadata(buf, size, app_id, devices);
+				munmap(buf, size);
+			} else {
+				res = -errno;
+			}
+		} else {
+			res = -EINVAL;
+		}
+
+		if (res == -EINVAL)
+			pw_log_error("PID %d .flatpak-info file is malformed",
+					(int)pid);
+		else if (res < 0)
+			pw_log_error("PID %d .flatpak-info parsing failed: %s",
+					(int)pid, spa_strerror(res));
+	}
+	close(info_fd);
+	return 1;
+#else
+	return 0;
+#endif
+}
+
+#endif /* FLATPAK_UTILS_H */