initial commit

This patch bootstrap the new nft-sync software. Basically, this
software aims to support two different setups:

1) Rule-set repository server. The software serves the nft rule-set to
   clients that request the ruleset.

   Basically from the system that acts as repository, you have to run:

   # nft-sync -c ../contrib/nft-sync.conf.server

   Then, from the client:

   # nft-sync -c ../contrib/nft-sync.conf.client --fetch

   Which displays the nft rule-set in the standard output, so you
   can inspect the nft rule-set.

   Alternatively, the client can also retrieve and apply the nft
   rule-set using the pull command instead:

   # nft-sync -c ../contrib/nft-sync.conf.client --pull

   [ Note that this command above does not work in this bootstrap yet ]

2) Rule-set synchronization: In case of primary-backup and multiprimary
   firewall configurations, the software makes sure that the firewall
   cluster is deploying the same filtering policy. In this case, you have
   to launch the process:

   # nft-sync -c ../contrib/nft-sync.conf --sync

   [ Note that this command above does not work in this bootstrap yet ]

This bootstrap provides the basic infrastructure as a proof-of-concept.
Many of the necessary features are still lacking:

* Implement --sync and --pull commands.

* Interaction with nft through libnftnl, which allows the software to
  retrieve the local nft rule-set, as well as to parse it and apply it.

* SSL support, specifically the repository mode needs it to make sure
  nobody can steal your filtering policy from the network.

* IPv6 support.

* Allow to serve different rule-sets in the repository mode.

And many others that will be added progressively.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/src/timer.c b/src/timer.c
new file mode 100644
index 0000000..7e39076
--- /dev/null
+++ b/src/timer.c
@@ -0,0 +1,50 @@
+/*
+ * (C) 2014 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <event.h>
+#include "timer.h"
+
+void *nft_timer_data(struct nft_timer *timer)
+{
+	return timer->data;
+}
+
+static void nft_timer_callback(int fd, short mask, void *data)
+{
+	struct nft_timer *timer = data;
+
+	timer->callback(timer);
+}
+
+void nft_timer_setup(struct nft_timer *timer, void (*cb)(struct nft_timer *),
+		     void *data)
+{
+	// assert: evtimer_pending(timer->event, NULL) == 0;
+	timer->callback	= cb;
+}
+
+void nft_timer_add(struct nft_timer *timer, unsigned int sec,
+		   unsigned int usec)
+{
+	struct timeval tv = {
+		.tv_sec		= sec,
+		.tv_usec	= usec,
+	};
+
+	if (evtimer_pending(&timer->event, NULL))
+		evtimer_del(&timer->event);
+
+	evtimer_set(&timer->event, nft_timer_callback, timer);
+	evtimer_add(&timer->event, &tv);
+}
+
+void nft_timer_del(struct nft_timer *timer)
+{
+	evtimer_del(&timer->event);
+}