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-rw-r--r--examples/nfexp-mnl-event.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/examples/nfexp-mnl-event.c b/examples/nfexp-mnl-event.c
new file mode 100644
index 0000000..5de97ec
--- /dev/null
+++ b/examples/nfexp-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_expect *exp;
+ uint32_t type = NFCT_T_UNKNOWN;
+ char buf[4096];
+
+ switch(nlh->nlmsg_type & 0xFF) {
+ case IPCTNL_MSG_EXP_NEW:
+ if (nlh->nlmsg_flags & (NLM_F_CREATE|NLM_F_EXCL))
+ type = NFCT_T_NEW;
+ else
+ type = NFCT_T_UPDATE;
+ break;
+ case IPCTNL_MSG_EXP_DELETE:
+ type = NFCT_T_DESTROY;
+ break;
+ }
+
+ exp = nfexp_new();
+ if (exp == NULL)
+ return MNL_CB_OK;
+
+ nfexp_nlmsg_parse(nlh, exp);
+
+ nfexp_snprintf(buf, sizeof(buf), exp,
+ type, NFCT_O_DEFAULT, 0);
+ printf("%s\n", buf);
+
+ nfexp_destroy(exp);
+
+ 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_EXP_NEW |
+ NF_NETLINK_CONNTRACK_EXP_UPDATE |
+ NF_NETLINK_CONNTRACK_EXP_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;
+}