summaryrefslogtreecommitdiffstats
path: root/examples/nfct-mnl-event.c
diff options
context:
space:
mode:
authorPablo Neira Ayuso <pablo@netfilter.org>2012-04-13 17:15:27 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2012-05-26 17:24:36 +0200
commit44dcf793ea4439978fbaae5b426912c4beb9425b (patch)
tree9885854cc5f878c3a323bd151e2b9b0e5e78c340 /examples/nfct-mnl-event.c
parentd773fb2afc097a08d51eae42740c63142b1752cf (diff)
examples: add example using libmnl and the new low-level API (conntrack)
This patch adds the following examples: nfct-mnl-create nfct-mnl-del nfct-mnl-dump nfct-mnl-event nfct-mnl-flush nfct-mnl-get Basically, we re-use the existing object oriented handling and we provide full control on the netlink socket at the same time. Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
Diffstat (limited to 'examples/nfct-mnl-event.c')
-rw-r--r--examples/nfct-mnl-event.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/examples/nfct-mnl-event.c b/examples/nfct-mnl-event.c
new file mode 100644
index 0000000..4fbf72e
--- /dev/null
+++ b/examples/nfct-mnl-event.c
@@ -0,0 +1,79 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+
+#include <libmnl/libmnl.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+
+static int data_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nf_conntrack *ct;
+ uint32_t type = NFCT_T_UNKNOWN;
+ char buf[4096];
+
+ switch(nlh->nlmsg_type & 0xFF) {
+ case IPCTNL_MSG_CT_NEW:
+ if (nlh->nlmsg_flags & (NLM_F_CREATE|NLM_F_EXCL))
+ type = NFCT_T_NEW;
+ else
+ type = NFCT_T_UPDATE;
+ break;
+ case IPCTNL_MSG_CT_DELETE:
+ type = NFCT_T_DESTROY;
+ break;
+ }
+
+ ct = nfct_new();
+ if (ct == NULL)
+ return MNL_CB_OK;
+
+ nfct_nlmsg_parse(nlh, ct);
+
+ nfct_snprintf(buf, sizeof(buf), ct,
+ type, NFCT_O_DEFAULT, 0);
+ printf("%s\n", buf);
+
+ nfct_destroy(ct);
+
+ return MNL_CB_OK;
+}
+
+int main(void)
+{
+ struct mnl_socket *nl;
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ int ret;
+
+ nl = mnl_socket_open(NETLINK_NETFILTER);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, NF_NETLINK_CONNTRACK_NEW |
+ NF_NETLINK_CONNTRACK_UPDATE |
+ NF_NETLINK_CONNTRACK_DESTROY,
+ MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ while (1) {
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ if (ret == -1) {
+ perror("mnl_socket_recvfrom");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL);
+ if (ret == -1) {
+ perror("mnl_cb_run");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ mnl_socket_close(nl);
+
+ return 0;
+}