Add port mapping for Slippi via UPnP or NAT-PMP #5
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NikhilNarayana
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There's no guarantee that directory initialization has completed by this point, so we can't safely use NativeLibrary. I'm making this change because of a crash being reported in Google Play Console. The exact way it's crashing is mysterious to me, so I'm not sure if this commit fixes the crash, but I think this commit is a reasonable change to make even if it doesn't fix the crash. Backtrace from Google Play Console: #00 pc 0x0000000000469074 /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (std::__ndk1::pair<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>> const, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>::pair[abi:nn180000]<char const* const&, char const* const&, 0>(char const* const&, char const* const&)) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc) #1 pc 0x0000000000468e9c /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (std::__ndk1::pair<std::__ndk1::__tree_iterator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, void*>*, long>, bool> std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>>>::__emplace_unique_impl<char const* const&, char const* const&>(char const* const&, char const* const&)) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc) #2 pc 0x0000000000462f08 /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (Common::Log::LogManager::GetLogTypes()) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc) #3 pc 0x000000000044339c /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (Java_org_dolphinemu_dolphinemu_NativeLibrary_GetLogTypeNames+56) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc) #4 pc 0x000000000031456c /data/misc/apexdata/com.android.art/dalvik-cache/arm64/boot.oat (art_jni_trampoline+108) #5 pc 0x0000000000781508 /apex/com.android.art/lib64/libart.so (nterp_helper+152) #6 pc 0x00000000002d94d4 /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/base.apk (org.dolphinemu.dolphinemu.features.settings.ui.SettingsFragmentPresenter.<clinit>+16) [...]
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screenshot: https://imgur.com/a/KDD0uEr
Note that I intend to have most users set this config via my Slippi Launcher network diagnostic tool (as a follow-up to project-slippi/slippi-launcher#391)
In cases where UPnP or NAT-PMP are available, enabling this option will improve connecting to other players while behind symmetric NAT. Regardless of own NAT type, it may also help connecting with other players who are behind symmetric NAT.
Note that while we don't specifically use PCP, NAT-PMP is literally PCP version 0 and routers which nominally support only PCP may be backward compatible.
While there are some security concerns with UPnP, all 3 major consoles support it and we literally already tell users who have connection problems to enable it on their router if possible (
!connect). In How NAT traversal works, the author notes:There's also a possibly of using port mapping to improve connections for players who are behind the same CGNAT/double NAT in the future.