lib-ssl-iostream: Detect OpenSSL memory functions' parameters via con…

…figure

The version number check doesn't work correctly for LibreSSL.

configure.ac

@@ -1747,6 +1747,28 @@ if test $want_openssl != no && test $have_ssl = no; then
       AC_DEFINE(HAVE_SSL_CLEAR_OPTIONS,, [Define if you have SSL_clear_options])
     fi
 
+    # New style mem functions? Should be in v1.1+
+    AC_CACHE_CHECK([whether CRYPTO_set_mem_functions has new style parameters],i_cv_have_ssl_new_mem_funcs,[
+      old_LIBS=$LIBS
+      LIBS="$LIBS -lssl"
+      AC_TRY_LINK([
+	#include <openssl/ssl.h>
+	int CRYPTO_set_mem_functions(
+		void *(*m) (size_t, const char *, int),
+		void *(*r) (void *, size_t, const char *, int),
+		void (*f) (void *, const char *, int));
+      ], [
+      ], [
+	i_cv_have_ssl_new_mem_funcs=yes
+      ], [
+	i_cv_have_ssl_new_mem_funcs=no
+      ])
+      LIBS=$old_LIBS
+    ])
+    if test $i_cv_have_ssl_new_mem_funcs = yes; then
+      AC_DEFINE(HAVE_SSL_NEW_MEM_FUNCS,, [Define if CRYPTO_set_mem_functions has new style parameters])
+    fi
+
     AC_CHECK_LIB(ssl, SSL_get_current_compression, [
       AC_DEFINE(HAVE_SSL_COMPRESSION,, [Build with OpenSSL compression])
     ],, $SSL_LIBS)

src/lib-ssl-iostream/dovecot-openssl-common.c

@@ -10,7 +10,7 @@
 static int openssl_init_refcount = 0;
 static ENGINE *dovecot_openssl_engine;
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#ifdef HAVE_SSL_NEW_MEM_FUNCS
 static void *dovecot_openssl_malloc(size_t size, const char *u0 ATTR_UNUSED, int u1 ATTR_UNUSED)
 #else
 static void *dovecot_openssl_malloc(size_t size)
@@ -26,7 +26,7 @@ static void *dovecot_openssl_malloc(size_t size)
 	return mem;
 }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#ifdef HAVE_SSL_NEW_MEM_FUNCS
 static void *dovecot_openssl_realloc(void *ptr, size_t size, const char *u0 ATTR_UNUSED, int u1 ATTR_UNUSED)
 #else
 static void *dovecot_openssl_realloc(void *ptr, size_t size)
@@ -40,7 +40,7 @@ static void *dovecot_openssl_realloc(void *ptr, size_t size)
 	return mem;
 }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#ifdef HAVE_SSL_NEW_MEM_FUNCS
 static void dovecot_openssl_free(void *ptr, const char *u0 ATTR_UNUSED, int u1 ATTR_UNUSED)
 #else
 static void dovecot_openssl_free(void *ptr)