Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

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

1 files changed, 89 insertions, 0 deletions

diff --git a/third_party/socket_wrapper/socket_wrapper.h b/third_party/socket_wrapper/socket_wrapper.h
new file mode 100644
index 0000000..3ec5031
--- /dev/null
+++ b/third_party/socket_wrapper/socket_wrapper.h
@@ -0,0 +1,89 @@
+/*
+ * BSD 3-Clause License
+ *
+ * Copyright (c) 2005-2008, Jelmer Vernooij <jelmer@samba.org>
+ * Copyright (c) 2006-2021, Stefan Metzmacher <metze@samba.org>
+ * Copyright (c) 2013-2021, Andreas Schneider <asn@samba.org>
+ * Copyright (c) 2014-2017, Michael Adam <obnox@samba.org>
+ * Copyright (c) 2016-2018, Anoop C S <anoopcs@redhat.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the author nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __SOCKET_WRAPPER_H__
+#define __SOCKET_WRAPPER_H__ 1
+
+#include <stdbool.h>
+
+/*
+   Socket wrapper advanced helpers.
+
+   Applications with the need to alter their behaviour when
+   socket wrapper is active, can link use these functions.
+
+   By default it's required for applications to use any of these
+   functions as libsocket_wrapper.so is injected at runtime via
+   LD_PRELOAD.
+
+   Applications using these functions should link against
+   libsocket_wrapper_noop.so by using -lsocket_wrapper_noop,
+   or implement their own noop stubs.
+*/
+
+/*
+ * This returns true when socket wrapper is actively in use.
+ */
+bool socket_wrapper_enabled(void);
+
+/*
+ * This allows socket_wrapper aware applications to
+ * indicate that the given fd does not belong to
+ * an inet socket.
+ *
+ * socket_wrapper may not be able to intercept the __close_nocancel()
+ * syscall made from within libc.so. As result it's possible
+ * that the in memory meta date of socket_wrapper references
+ * stale file descriptors, which are already reused for unrelated
+ * kernel objects, e.g. files, directories, ...
+ *
+ * Socket wrapper already intercepts a lot of unrelated
+ * functions like eventfd(), timerfd_create(), ... in order
+ * to remove stale meta data for the returned fd, but
+ * it will never be able to handle all possible syscalls.
+ *
+ * socket_wrapper_indicate_no_inet_fd() gives applications a way
+ * to do the same, explicitly without waiting for new syscalls to
+ * be added to libsocket_wrapper.so.
+ *
+ * This is a no-op if socket_wrapper is not in use or
+ * if the there is no in memory meta data for the given fd.
+ */
+void socket_wrapper_indicate_no_inet_fd(int fd);
+
+#endif /* __SOCKET_WRAPPER_H__ */