support NO_ENGINE (#4763)

* support OPENSSL_NO_ENGINE

* support some new openssl config args

* sigh

2 files changed, 68 insertions, 1 deletions

diff --git a/src/_cffi_src/openssl/engine.py b/src/_cffi_src/openssl/engine.py
index c255bbbc..8996f0c8 100644
--- a/src/_cffi_src/openssl/engine.py
+++ b/src/_cffi_src/openssl/engine.py
@@ -27,6 +27,7 @@ typedef ... UI_METHOD;
 static const unsigned int ENGINE_METHOD_RAND;
 
 static const int ENGINE_R_CONFLICTING_ENGINE_ID;
+static const long Cryptography_HAS_ENGINE;
 """
 
 FUNCTIONS = """
@@ -69,4 +70,71 @@ void ENGINE_cleanup(void);
 """
 
 CUSTOMIZATIONS = """
+#ifdef OPENSSL_NO_ENGINE
+static const long Cryptography_HAS_ENGINE = 0;
+typedef int (*ENGINE_GEN_INT_FUNC_PTR)(ENGINE *);
+typedef void *ENGINE_CTRL_FUNC_PTR;
+typedef void *ENGINE_LOAD_KEY_PTR;
+typedef void *ENGINE_CIPHERS_PTR;
+typedef void *ENGINE_DIGESTS_PTR;
+typedef struct ENGINE_CMD_DEFN_st {
+    unsigned int cmd_num;
+    const char *cmd_name;
+    const char *cmd_desc;
+    unsigned int cmd_flags;
+} ENGINE_CMD_DEFN;
+
+/* This section is so osrandom_engine.c can successfully compile even
+   when engine support is disabled */
+#define ENGINE_CMD_BASE 0
+#define ENGINE_CMD_FLAG_NO_INPUT 0
+#define ENGINE_F_ENGINE_CTRL 0
+#define ENGINE_R_INVALID_ARGUMENT 0
+#define ENGINE_R_CTRL_COMMAND_NOT_IMPLEMENTED 0
+int (*ENGINE_set_cmd_defns)(ENGINE *, const ENGINE_CMD_DEFN *) = NULL;
+
+static const unsigned int ENGINE_METHOD_RAND = 0;
+static const int ENGINE_R_CONFLICTING_ENGINE_ID = 0;
+
+ENGINE *(*ENGINE_get_first)(void) = NULL;
+ENGINE *(*ENGINE_get_last)(void) = NULL;
+int (*ENGINE_add)(ENGINE *) = NULL;
+int (*ENGINE_remove)(ENGINE *) = NULL;
+ENGINE *(*ENGINE_by_id)(const char *) = NULL;
+int (*ENGINE_init)(ENGINE *) = NULL;
+int (*ENGINE_finish)(ENGINE *) = NULL;
+void (*ENGINE_load_builtin_engines)(void) = NULL;
+ENGINE *(*ENGINE_get_default_RAND)(void) = NULL;
+int (*ENGINE_set_default_RAND)(ENGINE *) = NULL;
+int (*ENGINE_register_RAND)(ENGINE *) = NULL;
+void (*ENGINE_unregister_RAND)(ENGINE *) = NULL;
+void (*ENGINE_register_all_RAND)(void) = NULL;
+int (*ENGINE_ctrl)(ENGINE *, int, long, void *, void (*)(void)) = NULL;
+int (*ENGINE_ctrl_cmd)(ENGINE *, const char *, long, void *,
+                       void (*)(void), int) = NULL;
+int (*ENGINE_ctrl_cmd_string)(ENGINE *, const char *, const char *,
+                              int) = NULL;
+
+ENGINE *(*ENGINE_new)(void) = NULL;
+int (*ENGINE_free)(ENGINE *) = NULL;
+int (*ENGINE_up_ref)(ENGINE *) = NULL;
+int (*ENGINE_set_id)(ENGINE *, const char *) = NULL;
+int (*ENGINE_set_name)(ENGINE *, const char *) = NULL;
+int (*ENGINE_set_RAND)(ENGINE *, const RAND_METHOD *) = NULL;
+int (*ENGINE_set_destroy_function)(ENGINE *, ENGINE_GEN_INT_FUNC_PTR) = NULL;
+int (*ENGINE_set_init_function)(ENGINE *, ENGINE_GEN_INT_FUNC_PTR) = NULL;
+int (*ENGINE_set_finish_function)(ENGINE *, ENGINE_GEN_INT_FUNC_PTR) = NULL;
+int (*ENGINE_set_ctrl_function)(ENGINE *, ENGINE_CTRL_FUNC_PTR) = NULL;
+const char *(*ENGINE_get_id)(const ENGINE *) = NULL;
+const char *(*ENGINE_get_name)(const ENGINE *) = NULL;
+const RAND_METHOD *(*ENGINE_get_RAND)(const ENGINE *) = NULL;
+
+void (*ENGINE_add_conf_module)(void) = NULL;
+/* these became macros in 1.1.0 */
+void (*ENGINE_load_openssl)(void) = NULL;
+void (*ENGINE_load_dynamic)(void) = NULL;
+void (*ENGINE_cleanup)(void) = NULL;
+#else
+static const long Cryptography_HAS_ENGINE = 1;
+#endif
 """
diff --git a/src/_cffi_src/openssl/ssl.py b/src/_cffi_src/openssl/ssl.py
index 2218095c..92fd1e3e 100644
--- a/src/_cffi_src/openssl/ssl.py
+++ b/src/_cffi_src/openssl/ssl.py
@@ -334,7 +334,6 @@ int SSL_SESSION_print(BIO *, const SSL_SESSION *);
 const COMP_METHOD *SSL_get_current_compression(SSL *);
 const COMP_METHOD *SSL_get_current_expansion(SSL *);
 const char *SSL_COMP_get_name(const COMP_METHOD *);
-int SSL_CTX_set_client_cert_engine(SSL_CTX *, ENGINE *);
 
 unsigned long SSL_set_mode(SSL *, unsigned long);
 unsigned long SSL_get_mode(SSL *);