1 files changed, 171 insertions, 0 deletions

diff --git a/src/microspdy/tls.h b/src/microspdy/tls.h
new file mode 100644
index 00000000..5fb4371a
--- /dev/null
+++ b/src/microspdy/tls.h
@@ -0,0 +1,171 @@
+/*
+    This file is part of libmicrospdy
+    Copyright (C) 2012 Andrey Uzunov
+
+    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.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file tls.h
+ * @brief  TLS handling. openssl with NPN is used, but as long as the
+ *                      functions conform to this interface file, other libraries
+ *                      can be used.
+ * @author Andrey Uzunov
+ */
+
+#ifndef TLS_H
+#define TLS_H
+
+#include "platform.h"
+#include <openssl/err.h>
+#include <openssl/ssl.h>
+#include <openssl/rand.h>
+
+/* macros used in other files instead of types.
+ * useful in case of changing openssl to something else */
+#define SPDYF_TLS_SESSION_CONTEXT SSL
+#define SPDYF_TLS_DAEMON_CONTEXT SSL_CTX
+
+
+/**
+ * Used for return code when reading and writing to the TLS socket.
+ */
+enum SPDY_TLS_ERROR
+{
+        /**
+         * The connection was closed by the other party.
+         */
+        SPDY_TLS_ERROR_CLOSED = 0,
+        
+        /**
+         * Any kind of error ocurred. The session has to be closed.
+         */
+        SPDY_TLS_ERROR_ERROR = -2,
+        
+        /**
+         * The function had to return without processing any data. The whole
+         * cycle of events has to be called again (SPDY_run) as something
+         * either has to be written or read or the the syscall was
+         * interrupted by a signal.
+         */
+        SPDY_TLS_ERROR_AGAIN = -3,
+};
+
+
+/**
+ * Global initializing of openssl. Must be called only once in the program.
+ *
+ */
+void
+SPDYF_tls_global_init();
+
+
+/**
+ * Global deinitializing of openssl for the whole program. Should be called
+ * at the end of the program.
+ *
+ */
+void
+SPDYF_tls_global_deinit();
+
+
+/**
+ * Initializing of openssl for a specific daemon.
+ * Must be called when the daemon starts.
+ *
+ * @param daemon SPDY_Daemon for which openssl will be used. Daemon's
+ *                              certificate and key file are used.
+ * @return SPDY_YES on success or SPDY_NO on error
+ */
+int
+SPDYF_tls_init(struct SPDY_Daemon *daemon);
+
+
+/**
+ * Deinitializing openssl for a daemon. Should be called
+ * when the deamon is stopped.
+ *
+ * @param daemon SPDY_Daemon which is being stopped
+ */
+void
+SPDYF_tls_deinit(struct SPDY_Daemon *daemon);
+
+
+/**
+ * Initializing openssl for a specific connection. Must be called
+ * after the connection has been accepted.
+ *
+ * @param session SPDY_Session whose socket will be used by openssl
+ * @return SPDY_NO if some openssl funcs fail. SPDY_YES otherwise
+ */
+int
+SPDYF_tls_new_session(struct SPDY_Session *session);
+
+
+/**
+ * Deinitializing openssl for a specific connection. Should be called
+ * closing session's socket.
+ *
+ * @param session SPDY_Session whose socket is used by openssl
+ */
+void
+SPDYF_tls_close_session(struct SPDY_Session *session);
+
+
+/**
+ * Reading from a TLS socket. Reads available data and put it to the
+ * buffer.
+ *
+ * @param session for which data is received
+ * @param buffer where data from the socket will be written to
+ * @param size of the buffer
+ * @return number of bytes (at most size) read from the TLS connection
+ *         0 if the other party has closed the connection
+ *         SPDY_TLS_ERROR code on error
+ */
+int
+SPDYF_tls_recv(struct SPDY_Session *session,
+                                void * buffer,
+                                size_t size);
+
+
+/**
+ * Writing to a TLS socket. Writes the data given into the buffer to the
+ * TLS socket.
+ *
+ * @param session whose context is used
+ * @param buffer from where data will be written to the socket
+ * @param size number of bytes to be taken from the buffer
+ * @return number of bytes (at most size) from the buffer that has been
+ *                      written to the TLS connection
+ *         0 if the other party has closed the connection
+ *         SPDY_TLS_ERROR code on error
+ */
+int
+SPDYF_tls_send(struct SPDY_Session *session,
+                                const void * buffer,
+                                size_t size);
+
+
+/**
+ * Checks if there is data staying in the buffers of the underlying
+ * system that waits to be read.
+ *
+ * @param session which is checked
+ * @return SPDY_YES if data is pending or SPDY_NO otherwise
+ */
+int
+SPDYF_tls_is_pending(struct SPDY_Session *session);
+
+#endif