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, 0 insertions, 1 deletions

diff --git a/src/tcp.c b/src/tcp.c
index f6b05ef..af27c46 100644
--- a/src/tcp.c
+++ b/src/tcp.c
@@ -264,7 +264,6 @@ int tcp_accept(struct tcp_sock *m)
 
 		m->client_fd = ret;
 		m->state = TCP_SERVER_CONNECTED;
-		register_fd(m->client_fd, STATE(fds));
 	}
 	return m->client_fd;
 }