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-rw-r--r--examples/rtnl/rtnl-link-event.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/examples/rtnl/rtnl-link-event.c b/examples/rtnl/rtnl-link-event.c
new file mode 100644
index 0000000..aa51a1e
--- /dev/null
+++ b/examples/rtnl/rtnl-link-event.c
@@ -0,0 +1,100 @@
+/*
+ * (C) 2009-2010 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <libmnl/libmnl.h>
+#include <linux/if.h>
+#include <linux/if_link.h>
+#include <linux/rtnetlink.h>
+
+static int data_attr_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = (const struct nlattr **)data;
+ int type = mnl_attr_get_type(attr);
+
+ /* skip unsupported attribute in user-space */
+ if (mnl_attr_type_valid(attr, IFLA_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch(type) {
+ case IFLA_MTU:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
+ perror("mnl_attr_validate");
+ return MNL_CB_ERROR;
+ }
+ break;
+ case IFLA_IFNAME:
+ if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
+ perror("mnl_attr_validate2");
+ return MNL_CB_ERROR;
+ }
+ break;
+ }
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static int data_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nlattr *tb[IFLA_MAX+1] = {};
+ struct ifinfomsg *ifm = mnl_nlmsg_get_payload(nlh);
+
+ printf("index=%d type=%d flags=%d family=%d ",
+ ifm->ifi_index, ifm->ifi_type,
+ ifm->ifi_flags, ifm->ifi_family);
+
+ if (ifm->ifi_flags & IFF_RUNNING)
+ printf("[RUNNING] ");
+ else
+ printf("[NOT RUNNING] ");
+
+ mnl_attr_parse(nlh, sizeof(*ifm), data_attr_cb, tb);
+ if (tb[IFLA_MTU]) {
+ printf("mtu=%d ", mnl_attr_get_u32(tb[IFLA_MTU]));
+ }
+ if (tb[IFLA_IFNAME]) {
+ printf("name=%s", mnl_attr_get_str(tb[IFLA_IFNAME]));
+ }
+ printf("\n");
+ return MNL_CB_OK;
+}
+
+int main()
+{
+ struct mnl_socket *nl;
+ char buf[getpagesize()];
+ int ret;
+
+ nl = mnl_socket_open(NETLINK_ROUTE);
+ if (nl == NULL) {
+ perror("mnl_socket_open");
+ exit(EXIT_FAILURE);
+ }
+
+ if (mnl_socket_bind(nl, RTMGRP_LINK, MNL_SOCKET_AUTOPID) < 0) {
+ perror("mnl_socket_bind");
+ exit(EXIT_FAILURE);
+ }
+
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ while (ret > 0) {
+ ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL);
+ if (ret <= 0)
+ break;
+ ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+ }
+ if (ret == -1) {
+ perror("error");
+ exit(EXIT_FAILURE);
+ }
+
+ mnl_socket_close(nl);
+
+ return 0;
+}