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workaround for lack of RFC 5746 support

This is required for openSSL 3.0 clients

--- a/cpu.c

+++ b/cpu.c

@@ -49,7 +49,8 @@

 		sysfatal("can't authenticate");

 	memset(pass, 0, strlen(pass));

-	SSL_set_fd(ssl_conn, fd);

+	if(SSL_set_fd(ssl_conn, fd) == 0)

+		sysfatal("set fd failed");

 	if(SSL_connect(ssl_conn) < 0)

 		sysfatal("ssl could not connect");

@@ -130,9 +131,17 @@

 	SSL_load_error_strings();

 	ssl_ctx = SSL_CTX_new(TLSv1_2_client_method());

 	SSL_CTX_set_psk_client_callback(ssl_ctx, psk_client_cb);

+

+#if OPENSSL_VERSION_MAJOR==3

+	/* 9front support for RFC 5746 is not guranteed but we never do renegotiation anyway... */

+	SSL_CTX_set_options(ssl_ctx, SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION);

+#endif

+

 	if(ssl_ctx == nil)

 		sysfatal("could not init openssl");

 	ssl_conn = SSL_new(ssl_ctx);

+	if(ssl_conn == nil)

+		sysfatal("could not init openssl");

 	if(*argv && !Rflag){

 		pipe(pin);