From 099af5e395b843f86694005704111049f22e5d39 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Fri, 20 Jul 2018 15:10:06 +1000
Subject: src/openssl.c: Add SSL_CTX_up_ref shim for OpenSSL < 1.1.0

---
 src/openssl.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/openssl.c b/src/openssl.c
index 102408e..c66c270 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -311,6 +311,10 @@
 #define HAVE_SSL_CTX_SET1_PARAM (OPENSSL_PREREQ(1,0,2) || LIBRESSL_PREREQ(2,1,0))
 #endif
 
+#ifndef HAVE_SSL_CTX_UP_REF
+#define HAVE_SSL_CTX_UP_REF (OPENSSL_PREREQ(1,1,0) || LIBRESSL_PREREQ(2,7,0))
+#endif
+
 #ifndef HAVE_SSL_CTX_CERT_STORE
 #define HAVE_SSL_CTX_CERT_STORE (!OPENSSL_PREREQ(1,1,0))
 #endif
@@ -1853,6 +1857,18 @@ static int compat_SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm) {
 } /* compat_SSL_CTX_set1_param() */
 #endif
 
+#if !HAVE_SSL_CTX_UP_REF
+#define SSL_CTX_up_ref(...) EXPAND( compat_SSL_CTX_up_ref(__VA_ARGS__) )
+
+static int compat_SSL_CTX_up_ref(SSL_CTX *ctx) {
+	/* our caller should already have had a proper reference */
+	if (CRYPTO_add(&ctx->references, 1, CRYPTO_LOCK_SSL_CTX) < 2)
+		return 0; /* fail */
+
+	return 1;
+} /* compat_SSL_CTX_up_ref() */
+#endif
+
 #if !HAVE_STACK_OPENSSL_STRING_FUNCS
 #define sk_OPENSSL_STRING_num(s) sk_num(s)
 #define sk_OPENSSL_STRING_value(s, i) sk_value((s), (i))
-- 
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