Whole-project: partial implementation of protocol.

This commit is part of ticket #31. Branch is not in a compiling state.
Work is being done on utility functions and protocol implementation. To
be completed later.

Signed-off-by: Ramūnas Mažeikis <ramunasnezinomas@gmail.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/src/common/protocol_private.h b/src/common/protocol_private.h
new file mode 100644
index 0000000..3a4b1b2
--- /dev/null
+++ b/src/common/protocol_private.h
@@ -0,0 +1,66 @@
+/*
+ * Usurpataion --- server-client protocol private interface.
+ *
+ * Copyright (C) 2019 Ramūnas Mažeikis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; version 2.1
+ * of the License.
+ *
+ * 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef PROTOCOL_H_PRIVATE
+#define PROTOCOL_H_PRIVATE
+
+#define TLV_ARR_SIZE	(16)
+
+/* Pease don't rape the buffer with long messages, daemon-kun. */
+#define MSG_BUF_SIZE	(257)
+
+/* UDP can carry bigger packets but memory is hard to come by and more won't be
+ * needed anyway.
+ * */
+#define PACKET_MAX_SIZE	(512)
+
+/* Returns the amount of tlv's int a packet.
+ *
+ * If a tlv reports length that goes beyond the end of a packet, errno is set
+ * to TLV_OVERFLOW. To check this, set errno to 0 first.
+ * */
+size_t tlv_count(const struct packet_data * const packet);
+
+/* Parses a data packet, fills buffer of tlv's of size `buf_size` and returns
+ * the number of tlv's actually parsed.
+ *
+ * To check for errors, set errno to 0 and check after calling.
+ * */
+size_t get_tlvs(	const struct packet_data * const data,
+			const struct tlv *buf,
+			size_t buf_size);
+
+/* Takes a null-terminated string and appends it to the next outgoing packet.
+ * */
+void push_string(char *str);
+
+void push_fpi1(fpi1_t num);
+
+void push_timestamp(char *data);
+
+void push_request(char *data);
+
+void push_reply(char *data);
+
+void push_uuid(char *data);
+
+
+
+#endif /* PROTOCOL_H_PRIVATE */