Add support for OpenSSL, mbedTLS 2 and mbedTLS 3

Brings the previous OpenSSL implementation into src/IO/tls_openssl.c.

Now, the TLS functions have the implementation name as prefix, like
a_Tls_openssl_connect().

The generic interface at IO/tls.h hides the implementation which is
selected at configure time. The appropriate functions of that
implementation are called from IO/tls.c to IO/tls_<impl>.c. In this way,
support for more TLS libraries can easily be added.

In the case of mbedTLS, there are some incompatible changes from version
2 to 3, so we use some ifdefs to fix the differences.

1 files changed, 27 insertions, 38 deletions

diff --git a/src/IO/tls_mbedtls.h b/src/IO/tls_mbedtls.h
index a3bf9ba5..4a679698 100644
--- a/src/IO/tls_mbedtls.h
+++ b/src/IO/tls_mbedtls.h
@@ -1,5 +1,19 @@
-#ifndef __TLS_H__
-#define __TLS_H__
+/*
+ * File: tls_mbedtls.h
+ *
+ * Copyright (C) 2011 Benjamin Johnson <obeythepenguin@users.sourceforge.net>
+ * (for the https code offered from dplus browser that formed the basis...)
+ * Copyright 2016 corvid
+ * Copyright (C) 2023 Rodrigo Arias Mallo <rodarima@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __TLS_MBEDTLS_H__
+#define __TLS_MBEDTLS_H__
 
 #ifdef __cplusplus
 extern "C" {
@@ -7,44 +21,19 @@ extern "C" {
 
 #include "../url.h"
 
-#define TLS_CONNECT_NEVER -1
-#define TLS_CONNECT_NOT_YET 0
-#define TLS_CONNECT_READY 1
+void a_Tls_mbedtls_init();
+int a_Tls_mbedtls_certificate_is_clean(const DilloUrl *url);
+int a_Tls_mbedtls_connect_ready(const DilloUrl *url);
+void a_Tls_mbedtls_reset_server_state(const DilloUrl *url);
+void a_Tls_mbedtls_connect(int fd, const DilloUrl *url);
+void *a_Tls_mbedtls_connection(int fd);
+void a_Tls_mbedtls_freeall();
+void a_Tls_mbedtls_close_by_fd(int fd);
+int a_Tls_mbedtls_read(void *conn, void *buf, size_t len);
+int a_Tls_mbedtls_write(void *conn, void *buf, size_t len);
 
-void a_Tls_init();
-
-
-#ifdef ENABLE_SSL
-int a_Tls_certificate_is_clean(const DilloUrl *url);
-int a_Tls_connect_ready(const DilloUrl *url);
-void a_Tls_reset_server_state(const DilloUrl *url);
-
-/* Use to initiate a TLS connection. */
-void a_Tls_connect(int fd, const DilloUrl *url);
-
-void *a_Tls_connection(int fd);
-
-void a_Tls_freeall();
-
-void a_Tls_close_by_fd(int fd);
-int a_Tls_read(void *conn, void *buf, size_t len);
-int a_Tls_write(void *conn, void *buf, size_t len);
-#else
-
-#define a_Tls_certificate_is_clean(host) 0
-#define a_Tls_connect_ready(url) TLS_CONNECT_NEVER
-#define a_Tls_reset_server_state(url) ;
-#define a_Tls_handshake(fd, url) ;
-#define a_Tls_connect(fd, url) ;
-#define a_Tls_connection(fd) NULL
-#define a_Tls_freeall() ;
-#define a_Tls_close_by_fd(fd) ;
-#define a_Tls_read(conn, buf, len) 0
-#define a_Tls_write(conn, buf, len) 0
-#endif
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* __TLS_H__ */
-
+#endif /* __TLS_MBEDTLS_H__ */