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ListenSocket: Fallback to ipv4
If we can't create a listener socket with the ipv6 protocol, try to create one with the ipv4 protocol instead. This fixes the ListenSocket on machines where ipv6 is not available or has been completely disabled. This patch also exists ListenSocket::Listen() early if we fail to create the socket.
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@ -312,6 +312,16 @@ bool ListenSocket::Listen( int port, int backlog )
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if( getaddrinfo( nullptr, portbuf, &hints, &res ) != 0 ) return false;
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m_sock = socket( res->ai_family, res->ai_socktype, res->ai_protocol );
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if (m_sock == -1) {
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// IPV6 protocol may not be available/is disabled. Try to create a socket
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// with the IPV4 protocol
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hints.ai_family = AF_INET;
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if( getaddrinfo( nullptr, portbuf, &hints, &res ) != 0 ) return false;
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}
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m_sock = socket( res->ai_family, res->ai_socktype, res->ai_protocol );
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if (m_sock == -1) {
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return false;
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}
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#if defined _WIN32 || defined __CYGWIN__
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unsigned long val = 0;
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setsockopt( m_sock, IPPROTO_IPV6, IPV6_V6ONLY, (const char*)&val, sizeof( val ) );
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