1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
* (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 <string.h>
#include <time.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[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
struct ifinfomsg *ifm;
int ret;
unsigned int seq, portid, change = 0, flags = 0;
if (argc != 3) {
printf("Usage: %s [ifname] [up|down]\n", argv[0]);
exit(EXIT_FAILURE);
}
if (strncasecmp(argv[2], "up", strlen("up")) == 0) {
change |= IFF_UP;
flags |= IFF_UP;
} else if (strncasecmp(argv[2], "down", strlen("down")) == 0) {
change |= IFF_UP;
flags &= ~IFF_UP;
} 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_NEWLINK;
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_UNSPEC;
ifm->ifi_change = change;
ifm->ifi_flags = flags;
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_fprintf(stdout, nlh, nlh->nlmsg_len,
sizeof(struct ifinfomsg));
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;
}
|
