1 files changed, 76 insertions, 0 deletions
diff --git a/examples/rtnl-link-set.c b/examples/rtnl-link-set.c
new file mode 100644
index 0000000..36bf355
--- /dev/null
+++ b/examples/rtnl-link-set.c
@@ -0,0 +1,76 @@
+#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>
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char buf[getpagesize()];
+	struct nlmsghdr *nlh;
+	struct ifinfomsg *ifm;
+	int ret;
+	unsigned int seq, oper;
+
+	if (argc != 3) {
+		printf("Usage: %s [ifname] [up|down]\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (strncasecmp(argv[2], "up") == 0)
+		oper = IF_OPER_UP;
+	else if (strncasecmp(argv[2], "down") == 0)
+		oper = IF_OPER_DOWN;
+	else {
+		fprintf(stderr, "%s is not `up' nor `down'\n", argv[2]);
+		exit(EXIT_FAILURE);
+	}
+
+	nlh = mnl_nlmsg_put_header(buf);
+	nlh->nlmsg_type	= RTM_SETLINK;
+	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
+	nlh->nlmsg_seq = seq = time(NULL);
+	ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm));
+	ifm->ifi_family = AF_PACKET;
+
+	mnl_attr_put_u8(nlh, IFLA_OPERSTATE, oper);
+	mnl_attr_put_str(nlh, IFLA_IFNAME, argv[1]);
+
+	nl = mnl_socket_open(NETLINK_ROUTE);
+	if (nl == NULL) {
+		perror("mnl_socket_open");
+		exit(EXIT_FAILURE);
+	}
+
+	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
+		perror("mnl_socket_bind");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_nlmsg_print(nlh);
+
+	if (mnl_socket_sendto(nl, nlh, mnl_nlmsg_get_len(nlh)) < 0) {
+		perror("mnl_socket_send");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
+	if (ret == -1) {
+		perror("read");
+		exit(EXIT_FAILURE);
+	}
+
+	ret = mnl_cb_run(buf, ret, seq, NULL, NULL);
+	if (ret == -1){
+		perror("callback");
+		exit(EXIT_FAILURE);
+	}
+
+	mnl_socket_close(nl);
+
+	return 0;
+}