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, 21 insertions, 0 deletions

diff --git a/include/msg_buff.h b/include/msg_buff.h
new file mode 100644
index 0000000..f4eea36
--- /dev/null
+++ b/include/msg_buff.h
@@ -0,0 +1,21 @@
+#ifndef _MSG_BUFF_H_
+#define _MSG_BUFF_H_
+
+#include <stdint.h>
+
+struct msg_buff;
+
+struct msg_buff *msgb_alloc(uint32_t size);
+void msgb_free(struct msg_buff *msgb);
+
+uint32_t msgb_len(struct msg_buff *msgb);
+uint32_t msgb_size(struct msg_buff *msgb);
+
+unsigned char *msgb_data(struct msg_buff *msgb);
+unsigned char *msgb_tail(struct msg_buff *msgb);
+
+void *msgb_put(struct msg_buff *msgb, uint32_t len);
+void *msgb_pull(struct msg_buff *msgb, uint32_t len);
+void msgb_burp(struct msg_buff *msgb);
+
+#endif