ct_events_reliable.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>

#include <libnetfilter_conntrack/libnetfilter_conntrack.h>

static int events = 0;
static int new, update, destroy;

static int event_cb(enum nf_conntrack_msg_type type,
                    struct nf_conntrack *ct,
                    void *data)
{
        if (type == NFCT_T_NEW)
                new++;
        else if (type == NFCT_T_UPDATE)
                update++;
        else if (type == NFCT_T_DESTROY)
                destroy++;

        if ((++events % 10000) == 0)
                printf("%d events received (%d new, %d update, %d destroy)\n",
                        events, new, update, destroy);

        return NFCT_CB_CONTINUE;
}

static void sighandler(int foo)
{
        printf("%d events received (%d new, %d update, %d destroy)\n",
                events, new, update, destroy);
        exit(EXIT_SUCCESS);
}

int main(void)
{
        int ret;
        struct nfct_handle *h;
        int on = 1;

        signal(SIGINT, sighandler);

        h = nfct_open(CONNTRACK, NFCT_ALL_CT_GROUPS);
        if (!h) {
                perror("nfct_open");
                return 0;
        }

        setsockopt(nfct_fd(h), SOL_NETLINK,
                        NETLINK_BROADCAST_SEND_ERROR, &on, sizeof(int));
        setsockopt(nfct_fd(h), SOL_NETLINK,
                        NETLINK_NO_ENOBUFS, &on, sizeof(int));

        nfct_callback_register(h, NFCT_T_ALL, event_cb, NULL);

        printf("TEST: waiting for events...\n");

        ret = nfct_catch(h);

        printf("TEST: conntrack events ");
        if (ret == -1)
                printf("(%d)(%s)\n", ret, strerror(errno));
        else
                printf("(OK)\n");

        nfct_close(h);

        ret == -1 ? exit(EXIT_FAILURE) : exit(EXIT_SUCCESS);
}