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diff -up openssl-1.1.1k/apps/s_socket.c.addr-ipv6 openssl-1.1.1k/apps/s_socket.c
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--- openssl-1.1.1k/apps/s_socket.c.addr-ipv6 2021-07-16 15:14:08.491986682 +0200
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+++ openssl-1.1.1k/apps/s_socket.c 2021-07-16 15:23:21.271329197 +0200
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@@ -214,6 +214,8 @@ int do_server(int *accept_sock, const ch
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const BIO_ADDRINFO *next;
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int sock_family, sock_type, sock_protocol, sock_port;
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const BIO_ADDR *sock_address;
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+ int sock_family_fallback = AF_UNSPEC;
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+ const BIO_ADDR *sock_address_fallback = NULL;
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int sock_options = BIO_SOCK_REUSEADDR;
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int ret = 0;
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@@ -244,6 +246,10 @@ int do_server(int *accept_sock, const ch
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&& BIO_ADDRINFO_protocol(next) == sock_protocol) {
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if (sock_family == AF_INET
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&& BIO_ADDRINFO_family(next) == AF_INET6) {
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+ /* In case AF_INET6 is returned but not supported by the
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+ * kernel, retry with the first detected address family */
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+ sock_family_fallback = sock_family;
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+ sock_address_fallback = sock_address;
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sock_family = AF_INET6;
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sock_address = BIO_ADDRINFO_address(next);
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} else if (sock_family == AF_INET6
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@@ -253,6 +259,10 @@ int do_server(int *accept_sock, const ch
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}
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asock = BIO_socket(sock_family, sock_type, sock_protocol, 0);
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+ if (asock == INVALID_SOCKET && sock_family_fallback != AF_UNSPEC) {
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+ asock = BIO_socket(sock_family_fallback, sock_type, sock_protocol, 0);
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+ sock_address = sock_address_fallback;
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+ }
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if (asock == INVALID_SOCKET
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|| !BIO_listen(asock, sock_address, sock_options)) {
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BIO_ADDRINFO_free(res);
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