conntrackd: add cthelper infrastructure (+ example FTP helper)

This patch adds the user-space helper infrastructure. It also
contains the implementation of the FTP helper in user-space.

There's one example file that you can use to configure conntrackd
as user-space connection tracking helper under:

 doc/helper/conntrackd.conf

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

1 files changed, 2 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index 26f6c14..831a3c2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -19,6 +19,7 @@
 
 #include "conntrackd.h"
 #include "log.h"
+#include "helper.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -31,7 +32,7 @@
 #include <limits.h>
 
 struct ct_general_state st;
-union ct_state state;
+struct ct_state state;
 
 static const char usage_daemon_commands[] =
 	"Daemon mode commands:\n"