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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>
int main(int argc, char *argv[])
{
struct mnl_socket *nl;
char buf[getpagesize()];
struct nlmsghdr *nlh;
struct ifinfomsg *ifm;
int ret;
unsigned int seq, portid, 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);
}
portid = mnl_socket_get_portid(nl);
mnl_nlmsg_print(nlh);
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 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, portid, NULL, NULL);
if (ret == -1){
perror("callback");
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return 0;
}
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