Add Slippi option to use port mapping via UPnP and NAT-PMP

CMakeLists.txt

@@ -689,6 +689,9 @@ include_directories(Externals/semver/include)
 add_subdirectory(Externals/open-vcdiff)
 include_directories(Externals/open-vcdiff)
 
+add_subdirectory(Externals/libnatpmp)
+include_directories(Externals/libnatpmp)
+
 if(USE_SHARED_ENET)
 	check_lib(ENET libenet enet enet/enet.h QUIET)
 	include(CheckSymbolExists)

Externals/libnatpmp/CMakeLists.txt

@@ -0,0 +1,35 @@
+cmake_minimum_required(VERSION 2.8.12)
+
+if(POLICY CMP0048)
+	cmake_policy(SET CMP0048 NEW)
+endif()
+
+project(natpmp)
+
+set (NATPMP_SOURCES
+        natpmp.c
+        getgateway.c
+)
+
+if (WIN32)
+    set (NATPMP_SOURCES ${NATPMP_SOURCES} wingettimeofday.c)
+endif (WIN32)
+
+# Library itself
+add_library(natpmp STATIC ${NATPMP_SOURCES})
+target_include_directories(natpmp PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+target_compile_definitions(natpmp PRIVATE -DENABLE_STRNATPMPERR)
+
+if (WIN32)
+	target_link_libraries(natpmp PUBLIC ws2_32 Iphlpapi)
+	target_compile_definitions(natpmp PUBLIC -DNATPMP_STATICLIB)
+endif (WIN32)
+
+# Executables
+add_executable(natpmpc natpmpc.c)
+target_link_libraries(natpmpc natpmp)
+
+add_executable(testgetgateway
+	testgetgateway.c
+	getgateway.c)
+target_link_libraries(testgetgateway natpmp)

Externals/libnatpmp/Changelog.txt

@@ -0,0 +1,98 @@
+$Id: Changelog.txt,v 1.34 2023/04/23 10:46:11 nanard Exp $
+
+2013/11/26:
+  enforce strict aliasing rules.
+
+2013/09/10:
+  small patch for MSVC >= 16
+  rename win32 implementation of gettimeofday() to natpmp_gettimeofday()
+
+2012/08/21:
+  Little change in Makefile
+  removed warnings in testgetgateway.c
+  Fixed bugs in command line argumentparsing in natpmpc.c
+
+2011/08/07:
+  Patch to build on debian/kFreeBSD.
+
+2011/07/15:
+  Put 3 clauses BSD licence at the top of source files.
+
+2011/06/18:
+  --no-undefined => -Wl,--no-undefined
+  adding a natpmpc.1 man page
+
+2011/05/19:
+  Small fix in libnatpmpmodule.c thanks to Manuel Mausz
+
+2011/01/03:
+  Added an argument to initnatpmp() in order to force the gateway to be used
+
+2011/01/01:
+  fix in make install
+
+2010/05/21:
+  make install now working under MacOSX (and BSD)
+
+2010/04/12:
+  cplusplus stuff in natpmp.h
+
+2010/02/02:
+  Fixed compilation under Mac OS X
+
+2009/12/19:
+  improve and fix building under Windows.
+  Project files for MS Visual Studio 2008
+  More simple (and working) code for Win32.
+  More checks in the /proc/net/route parsing. Add some comments.
+
+2009/08/04:
+  improving getgateway.c for windows
+
+2009/07/13:
+  Adding Haiku code in getgateway.c
+
+2009/06/04:
+  Adding Python module thanks to David Wu
+
+2009/03/10:
+  Trying to have windows get gateway working if not using DHCP
+
+2009/02/27:
+  don't include declspec.h if not under WIN32.
+
+2009/01/23:
+  Prefixed the libraries name with lib
+
+2008/10/06:
+  Fixed a memory leak in getdefaultgateway() (USE_SYSCTL_NET_ROUTE)
+
+2008/07/03:
+  Adding WIN32 code from Robbie Hanson
+
+2008/06/30:
+  added a Solaris implementation for getgateway().
+  added a LICENCE file to the distribution
+
+2008/05/29:
+  Anonymous unions are forbidden in ANSI C. That was causing problems with
+  non-GCC compilers.
+
+2008/04/28:
+  introduced strnatpmperr()
+  improved natpmpc.c sample
+  make install now install the binary
+
+2007/12/13:
+  Fixed getgateway.c for working under OS X ;)
+  Fixed values for NATPMP_PROTOCOL_TCP and NATPMP_PROTOCOL_UDP
+
+2007/12/11:
+  Fixed getgateway.c for compilation under Mac OS X
+
+2007/12/01:
+  added some comments in .h
+
+2007/11/30:
+  implemented almost everything
+

Externals/libnatpmp/LICENSE

@@ -0,0 +1,29 @@
+BSD 3-Clause License
+
+Copyright (c) 2007-2022, Thomas BERNARD
+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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

Externals/libnatpmp/README

@@ -0,0 +1,8 @@
+libnatpmp (c) 2007-2023 Thomas Bernard
+contact : [email protected]
+
+see http://miniupnp.free.fr/libnatpmp.html
+or http://miniupnp.tuxfamily.org/libnatpmp.html
+for some documentation and code samples.
+
+github : https://github.com/miniupnp/libnatpmp

Externals/libnatpmp/declspec.h

@@ -0,0 +1,21 @@
+#ifndef DECLSPEC_H_INCLUDED
+#define DECLSPEC_H_INCLUDED
+
+#if defined(WIN32) && !defined(STATICLIB)
+	/* for windows dll */
+	#ifdef NATPMP_EXPORTS
+		#define LIBSPEC __declspec(dllexport)
+	#else
+		#define LIBSPEC __declspec(dllimport)
+	#endif
+#else
+	#if defined(__GNUC__) && __GNUC__ >= 4
+		/* fix dynlib for OS X 10.9.2 and Apple LLVM version 5.0 */
+		#define LIBSPEC __attribute__ ((visibility ("default")))
+	#else
+		#define LIBSPEC
+	#endif
+#endif
+
+#endif
+