This adds functionality to allow system-level control over handing out
file descriptors for sockets, to allow tighter security when running a
Wayland compositor under a Wayland session server.
Signed-off-by: Bryce Harrington <br...@osg.samsung.com>
Cc: Sung-Jin Park <sj76.p...@samsung.com>
Cc: Sangjin Lee <lsj...@samsung.com>
---
v2:
+ Drop tab corrections
+ Add patch to move if statement into assert
v3:
+ Removed wl_os_socket_check_cloexec
+ Removed wl_display_add_socket_fd_auto
+ Replaced _wl_display_add_socket
+ Rewrote wl_display_add_socket_fd
v4:
+ Rewrote wl_display_add_socket_fd
+ Remove everything except just storing the fd
+ Document that we're assuming the caller sets up the fd properly
src/wayland-server-core.h | 3 +++
src/wayland-server.c | 43 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 46 insertions(+)
diff --git a/src/wayland-server-core.h b/src/wayland-server-core.h
index 85b4b9e..1700cd3 100644
--- a/src/wayland-server-core.h
+++ b/src/wayland-server-core.h
@@ -131,6 +131,9 @@ wl_display_add_socket(struct wl_display *display, const
char *name);
const char *
wl_display_add_socket_auto(struct wl_display *display);
+int
+wl_display_add_socket_fd(struct wl_display *display, int sock_fd);
+
void
wl_display_terminate(struct wl_display *display);
diff --git a/src/wayland-server.c b/src/wayland-server.c
index 1364d5d..a4fcc96 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -1198,6 +1198,49 @@ wl_display_add_socket_auto(struct wl_display *display)
return NULL;
}
+/** Add a socket with an existing fd to Wayland display for the clients to
connect.
+ *
+ * \param display Wayland display to which the socket should be added.
+ * \param name Name of the Unix socket.
+ * \return 0 if success. -1 if failed.
+ *
+ * The existing socket fd must already be created, opened, and locked.
+ * The fd must be properly set to CLOEXEC and bound to a socket file
+ * with both bind() and listen() already called.
+ *
+ * \memberof wl_display
+ */
+WL_EXPORT int
+wl_display_add_socket_fd(struct wl_display *display, int sock_fd)
+{
+ struct wl_socket *s;
+ struct stat buf;
+
+ /* Require a valid fd or fail */
+ if (sock_fd < 0 || fstat(sock_fd, &buf) < 0 || !S_ISSOCK(buf.st_mode)) {
+ return -1;
+ }
+
+ s = wl_socket_alloc();
+ if (s == NULL)
+ return -1;
+
+ /* Reuse the existing fd */
+ s->fd = sock_fd;
+
+ s->source = wl_event_loop_add_fd(display->loop, s->fd,
+ WL_EVENT_READABLE,
+ socket_data, display);
+ if (s->source == NULL) {
+ wl_log("failed to establish event source\n");
+ return -1;
+ }
+
+ wl_list_insert(display->socket_list.prev, &s->link);
+
+ return 0;
+}
+
/** Add a socket to Wayland display for the clients to connect.
*
* \param display Wayland display to which the socket should be added.
--
1.9.1
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