Fix build with LibreSSL

When using LibreSSL instead of OpenSSL, linkage of hostapd executable
fails with the following error when using some LibreSSL versions

    ../src/crypto/tls_openssl.o: In function `tls_verify_cb':
    tls_openssl.c:(.text+0x1273): undefined reference to `ASN1_STRING_get0_data'
    ../src/crypto/tls_openssl.o: In function `tls_connection_peer_serial_num':
    tls_openssl.c:(.text+0x3023): undefined reference to `ASN1_STRING_get0_data'
    collect2: error: ld returned 1 exit status
    make: *** [Makefile:1278: hostapd] Error 1

ASN1_STRING_get0_data is present in recent OpenSSL, but absent in some
versions of LibreSSL (confirmed for version 2.6.5), so fallback needs to
be defined in this case, just like for old OpenSSL.

This patch was inspired by similar patches to other projects, such as
spice-gtk, pjsip.

Link: https://bugs.gentoo.org/672834
Signed-off-by: Andrey Utkin <andrey_utkin@gentoo.org>

diff --git a/src/crypto/tls_openssl.c b/src/crypto/tls_openssl.c
index 0d5ebda699f02891e4c14a796fb4d222c55d713c..c2b0dfaec1e914f5cf13060ebadb9fd9b7e611f1 100644 (file)
--- a/src/crypto/tls_openssl.c
+++ b/src/crypto/tls_openssl.c
@@ -104,7 +104,9 @@ static size_t SSL_SESSION_get_master_key(const SSL_SESSION *session,
 
 #endif
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
+       (defined(LIBRESSL_VERSION_NUMBER) && \
+        LIBRESSL_VERSION_NUMBER < 0x20700000L)
 #ifdef CONFIG_SUITEB
 static int RSA_bits(const RSA *r)
 {