From 18b67d6eafbecb8ff3f6cb514594d115e099117d Mon Sep 17 00:00:00 2001
From: Dmitry Podgorny <pasis.ua@gmail.com>
Date: Fri, 11 Oct 2019 01:59:34 +0300
Subject: [PATCH] tls/openssl: add LibreSSL support

OpenSSL and LibreSSL versions are incompatible. Moreover, LibreSSL
always define OPENSSL_VERSION_NUMBER as 0x20000000L. Instead of checking
for LibreSSL everywhere explicitly, redefine OPENSSL_VERSION_NUMBER.

See similar issues with nginx project: https://trac.nginx.org/nginx/ticket/1605
---
 src/tls_openssl.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/tls_openssl.c b/src/tls_openssl.c
index 9d55e36..503084d 100644
--- a/src/tls_openssl.c
+++ b/src/tls_openssl.c
@@ -31,6 +31,22 @@
 #include "tls.h"
 #include "sock.h"
 
+/*
+ * Redefine OPENSSL_VERSION_NUMBER for LibreSSL.
+ * LibreSSL and OpenSSL use different and incompatible version schemes. Solve
+ * this issue in the way how nginx project did.
+ */
+#if (defined LIBRESSL_VERSION_NUMBER && OPENSSL_VERSION_NUMBER == 0x20000000L)
+#undef OPENSSL_VERSION_NUMBER
+#if (LIBRESSL_VERSION_NUMBER >= 0x2080000fL)
+#define OPENSSL_VERSION_NUMBER  0x1010000fL
+#elif (LIBRESSL_VERSION_NUMBER >= 0x2070000fL)
+#define OPENSSL_VERSION_NUMBER  0x1000200fL
+#else
+#define OPENSSL_VERSION_NUMBER  0x1000107fL
+#endif
+#endif
+
 struct _tls {
     xmpp_ctx_t *ctx;
     sock_t sock;