Bring in compatibility for OpenSSL 1.1 style init functions.

This adds OPENSSL_init_crypto and OPENSSL_init_ssl, as well
thread safety modifications for the existing LibreSSL init
functions.  The initialization routines are called automatically
by the normal entry points into the library, as in newer OpenSSL

ok jsing@, nits by tb@ and deraadt@

1 files changed, 50 insertions, 0 deletions

diff --git a/lib/libssl/ssl_init.c b/lib/libssl/ssl_init.c
new file mode 100644
index 00000000000..0ef80956ed1
--- /dev/null
+++ b/lib/libssl/ssl_init.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 Bob Beck <beck@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* OpenSSL style init */
+
+#include <pthread.h>
+#include <stdio.h>
+
+#include <openssl/objects.h>
+
+#include "ssl_locl.h"
+
+static pthread_t ssl_init_thread;
+
+static void
+OPENSSL_init_ssl_internal(void)
+{
+	ssl_init_thread = pthread_self();
+	SSL_load_error_strings();
+	SSL_library_init();
+}
+
+int
+OPENSSL_init_ssl(uint64_t opts, const void *settings)
+{
+	static pthread_once_t once = PTHREAD_ONCE_INIT;
+
+	if (pthread_equal(pthread_self(), ssl_init_thread))
+		return 1; /* don't recurse */
+
+	OPENSSL_init_crypto(opts, settings);
+
+	if (pthread_once(&once, OPENSSL_init_ssl_internal) != 0)
+		return 0;
+
+	return 1;
+}