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Test: proper ipv6 support, still sending v4 to client tun

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DcruBro
2025-12-10 16:02:55 +01:00
parent 4ff33ffdab
commit 5e3aef78a5
4 changed files with 85 additions and 29 deletions
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33
include/columnlynx/server/net/tcp/tcp_server.hpp
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@@ -34,24 +34,33 @@ namespace ColumnLynx::Net::TCP {
// Preload the config map
mRawServerConfig = Utils::getConfigMap("server_config", {"NETWORK", "SUBNET_MASK"});
asio::error_code ec;
asio::error_code ec_open, ec_v6only, ec_bind;
if (!ipv4Only) {
// Try IPv6 first (dual-stack check)
// Try IPv6 (dual-stack if supported)
asio::ip::tcp::endpoint endpoint_v6(asio::ip::tcp::v6(), port);
mAcceptor.open(endpoint_v6.protocol(), ec);
if (!ec) {
mAcceptor.set_option(asio::ip::v6_only(false), ec); // Allow dual-stack if possible
mAcceptor.bind(endpoint_v6, ec);
mAcceptor.open(endpoint_v6.protocol(), ec_open);
if (!ec_open) {
// Try enabling dual-stack, but DO NOT treat failure as fatal
mAcceptor.set_option(asio::ip::v6_only(false), ec_v6only);
// Try binding IPv6
mAcceptor.bind(endpoint_v6, ec_bind);
}
}
// Fallback to IPv4 if anything failed
if (ec || ipv4Only) {
Utils::warn("TCP: IPv6 unavailable (" + ec.message() + "), falling back to IPv4 only");
// If IPv6 bind failed OR IPv6 open failed OR forced IPv4-only
if (ipv4Only || ec_open || ec_bind) {
if (!ipv4Only)
Utils::warn("TCP: IPv6 unavailable (open=" + ec_open.message() +
", bind=" + ec_bind.message() +
"), falling back to IPv4 only");
asio::ip::tcp::endpoint endpoint_v4(asio::ip::tcp::v4(), port);
mAcceptor.close(); // ensure clean state
mAcceptor.close(); // guarantee clean state
mAcceptor.open(endpoint_v4.protocol());
mAcceptor.bind(endpoint_v4);
}