MEDIUM: Add parsing of mailers section

As mailer and mailers structures and allow parsing of
a mailers section into those structures.

These structures will subsequently be freed as it is
not yet possible to use reference them in the configuration.

Signed-off-by: Simon Horman <horms@verge.net.au>
diff --git a/include/types/mailers.h b/include/types/mailers.h
new file mode 100644
index 0000000..582bb94
--- /dev/null
+++ b/include/types/mailers.h
@@ -0,0 +1,65 @@
+/*
+ * include/types/mailer.h
+ * This file defines everything related to mailer.
+ *
+ * Copyright 2015 Horms Solutions Ltd., Simon Horman <horms@verge.net.au>
+ *
+ * Based on include/types/peers.h
+ *
+ * Copyright 2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
+ *
+ * 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_EMAIL_ALERT_H
+#define _TYPES_EMAIL_ALERT_H
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+struct mailer {
+	char *id;
+	struct mailers *mailers;
+	struct {
+		const char *file;	/* file where the section appears */
+		int line;		/* line where the section appears */
+	} conf;				/* config information */
+	struct sockaddr_storage addr;	/* SMTP server address */
+	struct protocol *proto;		/* SMTP server address's protocol */
+	struct xprt_ops *xprt;		/* SMTP server socket operations at transport layer */
+	void *sock_init_arg;		/* socket operations's opaque init argument if needed */
+	struct mailer *next;		/* next mailer in the list */
+};
+
+
+struct mailers {
+	char *id;			/* mailers section name */
+	struct mailer *mailer_list;	/* mailers in this mailers section */
+	struct {
+		const char *file;	/* file where the section appears */
+		int line;		/* line where the section appears */
+	} conf;				/* config information */
+	struct mailers *next;	        /* next mailers section */
+	int count;			/* total number of mailers in this mailers section */
+	int users;			/* number of users of this mailers section */
+};
+
+
+extern struct mailers *mailers;
+
+#endif /* _TYPES_EMAIL_ALERT_H */
+