#include #include static void change_cb(struct nl_cache *cache, struct nl_object *obj, int action, void *data) { struct nfnl_ct *ct = (struct nfnl_ct *) obj; static struct nl_addr *hack = NULL; if (!hack) nl_addr_parse("194.88.212.233", AF_INET, &hack); if (!nl_addr_cmp(hack, nfnl_ct_get_src(ct, 1)) || !nl_addr_cmp(hack, nfnl_ct_get_dst(ct, 1))) { struct nl_dump_params dp = { .dp_type = NL_DUMP_LINE, .dp_fd = stdout, }; printf("UPDATE "); nl_object_dump(obj, &dp); } } int main(int argc, char *argv[]) { struct nl_cache_mngr *mngr; struct nl_sock *sock; struct nl_cache *ct; int err; sock = nl_cli_alloc_socket(); err = nl_cache_mngr_alloc(sock, NETLINK_NETFILTER, NL_AUTO_PROVIDE, &mngr); if (err < 0) { nl_perror(err, "nl_cache_mngr_alloc"); return -1; } err = nl_cache_mngr_add(mngr, "netfilter/ct", &change_cb, NULL, &ct); if (err < 0) { nl_perror(err, "nl_cache_mngr_add(netfilter/ct)"); return -1; } for (;;) { int err = nl_cache_mngr_poll(mngr, 5000); if (err < 0) { nl_perror(err, "nl_cache_mngr_poll()"); return -1; } } nl_cache_mngr_free(mngr); return 0; }