conntrackd: generalize file descriptor infrastructure

This patch generalizes the select-based file descriptor infrastructure
by allowing you to register file descriptors and its callbacks. Instead
of hardcoding the descriptors that needs to be checked.

Now, struct fds_item contains a callback and pointer to data that is
passed to it:

  struct fds_item {
         struct list_head        head;
         int                     fd;
 +       void                    (*cb)(void *data);
 +       void                    *data;
  };

Then, we check which ones are active in the select_main_step() function:

 list_for_each_entry(cur, &STATE(fds)->list, head) {
         if (FD_ISSET(cur->fd, &readfds))
                 cur->cb(cur->data);
 }

And it invoked the corresponding callback.

I had to slightly modify the channel infrastructure to fit it into
the changes.

This modularity is required for the upcoming cthelper support.

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

1 files changed, 1 insertions, 2 deletions

diff --git a/include/conntrackd.h b/include/conntrackd.h
index 9359dfa..0e203e7 100644
--- a/include/conntrackd.h
+++ b/include/conntrackd.h
@@ -264,7 +264,6 @@ extern struct ct_general_state st;
 struct ct_mode {
 	struct internal_handler *internal;
 	int (*init)(void);
-	void (*run)(fd_set *readfds);
 	int (*local)(int fd, int type, void *data);
 	void (*kill)(void);
 };
@@ -278,7 +277,7 @@ extern struct ct_mode stats_mode;
 /* These live in run.c */
 void killer(int foo);
 int init(void);
-void run(void);
+void select_main_loop(void);
 
 /* from read_config_yy.c */
 int