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Implement workaround for qWAVE issues handling IPv4-mapped IPv6 addresses

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This commit is contained in:
Cameron Gutman 2024-02-01 18:04:55 -06:00
parent 190ea41b2e
commit fe8b0bad92
1 changed files with 33 additions and 1 deletions
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34
src/platform/windows/misc.cpp
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@ -1214,6 +1214,7 @@ namespace platf {
SOCKADDR_IN saddr_v4;
SOCKADDR_IN6 saddr_v6;
PSOCKADDR dest_addr;
bool using_connect_hack = false;
static std::once_flag load_qwave_once_flag;
std::call_once(load_qwave_once_flag, []() {
@ -1252,9 +1253,40 @@ namespace platf {
return nullptr;
}
auto disconnect_fg = util::fail_guard([&]() {
if (using_connect_hack) {
SOCKADDR_IN6 empty = {};
empty.sin6_family = AF_INET6;
if (connect((SOCKET) native_socket, (PSOCKADDR) &empty, sizeof(empty)) < 0) {
auto wsaerr = WSAGetLastError();
BOOST_LOG(error) << "qWAVE dual-stack workaround failed: "sv << wsaerr;
}
}
});
if (address.is_v6()) {
saddr_v6 = to_sockaddr(address.to_v6(), port);
auto address_v6 = address.to_v6();
saddr_v6 = to_sockaddr(address_v6, port);
dest_addr = (PSOCKADDR) &saddr_v6;
// qWAVE doesn't properly support IPv4-mapped IPv6 addresses, nor does it
// correctly support IPv4 addresses on a dual-stack socket (despite MSDN's
// claims to the contrary). To get proper QoS tagging when hosting in dual
// stack mode, we will temporarily connect() the socket to allow qWAVE to
// successfully initialize a flow, then disconnect it again so WSASendMsg()
// works later on.
if (address_v6.is_v4_mapped()) {
if (connect((SOCKET) native_socket, (PSOCKADDR) &saddr_v6, sizeof(saddr_v6)) < 0) {
auto wsaerr = WSAGetLastError();
BOOST_LOG(error) << "qWAVE dual-stack workaround failed: "sv << wsaerr;
}
else {
BOOST_LOG(debug) << "Using qWAVE connect() workaround for QoS tagging"sv;
using_connect_hack = true;
dest_addr = nullptr;
}
}
}
else {
saddr_v4 = to_sockaddr(address.to_v4(), port);