MEDIUM: protocol: add minimalist UDP protocol client
Basic introduction of a UDP layer in HAProxy. It can be used as a
client only and manages UDP exchanges with servers.
It can't be used to load-balance UDP protocols, but only used by
internal features such as DNS resolution.
diff --git a/include/types/proto_udp.h b/include/types/proto_udp.h
new file mode 100644
index 0000000..2604418
--- /dev/null
+++ b/include/types/proto_udp.h
@@ -0,0 +1,52 @@
+/*
+ * include/types/proto_udp.h
+ * This file provides structures and types for UDP protocol.
+ *
+ * Copyright (C) 2014 Baptiste Assmann <bedis9@gmail.com>
+ *
+ * This library 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
+ * exclusively.
+ *
+ * This library 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _TYPES_PROTO_UDP_H
+#define _TYPES_PROTO_UDP_H
+
+#include <arpa/inet.h>
+
+/*
+ * datagram related structure
+ */
+struct dgram_conn {
+ const struct dgram_data_cb *data; /* data layer callbacks. Must be set before */
+ void *owner; /* pointer to upper layer's entity */
+ union { /* definitions which depend on connection type */
+ struct { /*** information used by socket-based dgram ***/
+ int fd; /* file descriptor */
+ } sock;
+ } t;
+ struct {
+ struct sockaddr_storage from; /* client address, or address to spoof when connecting to the server */
+ struct sockaddr_storage to; /* address reached by the client, or address to connect to */
+ } addr; /* addresses of the remote side, client for producer and server for consumer */
+};
+
+/*
+ * datagram callback structure
+ */
+struct dgram_data_cb {
+ void (*recv)(struct dgram_conn *dgram); /* recv callback */
+ void (*send)(struct dgram_conn *dgram); /* send callback */
+};
+
+#endif /* _TYPES_PROTO_UDP_H */