Add "GET tls_library" to provide information on TLS library and version

This new wpa_supplicant and hostapd control interface command can be
used to determine which TLS library is used in the build and what is the
version of that library.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/crypto/tls.h

@@ -556,4 +556,6 @@ void tls_connection_set_log_cb(struct tls_connection *conn,
 
 void tls_connection_set_test_flags(struct tls_connection *conn, u32 flags);
 
+int tls_get_library_version(char *buf, size_t buf_len);
+
 #endif /* TLS_H */

src/crypto/tls_gnutls.c

@@ -1151,3 +1151,10 @@ int tls_connection_set_session_ticket_cb(void *tls_ctx,
 {
 	return -1;
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "GnuTLS build=%s run=%s",
+			   GNUTLS_VERSION, gnutls_check_version(NULL));
+}

src/crypto/tls_internal.c

@@ -672,3 +672,9 @@ int tls_connection_set_session_ticket_cb(void *tls_ctx,
 #endif /* CONFIG_TLS_INTERNAL_SERVER */
 	return -1;
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "internal");
+}

src/crypto/tls_none.c

@@ -192,3 +192,9 @@ unsigned int tls_capabilities(void *tls_ctx)
 {
 	return 0;
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "none");
+}

src/crypto/tls_openssl.c

@@ -3554,3 +3554,11 @@ int tls_connection_set_session_ticket_cb(void *tls_ctx,
 	return -1;
 #endif /* EAP_FAST || EAP_FAST_DYNAMIC || EAP_SERVER_FAST */
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "OpenSSL build=%s run=%s",
+			   OPENSSL_VERSION_TEXT,
+			   SSLeay_version(SSLEAY_VERSION));
+}

src/crypto/tls_schannel.c

@@ -750,3 +750,9 @@ unsigned int tls_capabilities(void *tls_ctx)
 {
 	return 0;
 }
+
+
+int tls_get_library_version(char *buf, size_t buf_len)
+{
+	return os_snprintf(buf, buf_len, "schannel");
+}