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Allow Windows >= Vista to listen on dual-stack #34

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Allow Windows >= Vista to listen on dual-stack #34

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14 changes: 11 additions & 3 deletions Socket.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -404,9 +404,17 @@ bool Socket::Bind(unsigned short port)
name.sin_port = htons(port);
addr = reinterpret_cast<sockaddr*>(&name);
len = sizeof(name);
}
else
{
} else {
#ifdef _WIN32
// attempt to listen on dual-stack instead of v6-only
// don't fail if this can't be set, just listen on v6-only
// this option only available on Vista and later
// ref: https://learn.microsoft.com/en-us/windows/win32/winsock/dual-stack-sockets
DWORD flag = 0; // defaults to 1
if (0 != setsockopt((ZSOCKET)m_socket, IPPROTO_IPV6, IPV6_V6ONLY, (const char *)&flag, sizeof(DWORD)))
LogWarning("Can't enable dual-stack socket, listening on IPv6 only\n");
#endif

memset(&name6, 0, sizeof(name6));

//Set port number
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