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#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_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[IFLA_MAX+1];
struct ifinfomsg *ifm = mnl_nlmsg_get_data(nlh);
int len = mnl_nlmsg_get_len(nlh);
struct nlattr *attr;
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_at_offset(nlh, sizeof(*ifm), tb, IFLA_MAX);
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()];
struct nlmsghdr *nlh;
struct rtgenmsg *rt;
int ret;
unsigned int seq;
nlh = mnl_nlmsg_put_header(buf);
nlh->nlmsg_type = RTM_GETLINK;
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
nlh->nlmsg_seq = seq = time(NULL);
rt = mnl_nlmsg_put_extra_header(nlh, sizeof(struct rtgenmsg));
rt->rtgen_family = AF_PACKET;
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);
}
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));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, seq, data_cb, NULL);
if (ret <= MNL_CB_STOP)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
perror("error");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return 0;
}
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