1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <time.h>
4
5 #include <libmnl/libmnl.h>
6 #include <libnetfilter_conntrack/libnetfilter_conntrack.h>
7
print_label(struct nf_conntrack * ct,struct nfct_labelmap * map)8 static void print_label(struct nf_conntrack *ct, struct nfct_labelmap *map)
9 {
10 unsigned int i, max;
11 const struct nfct_bitmask *b = nfct_get_attr(ct, ATTR_CONNLABELS);
12 if (!b)
13 return;
14
15 puts("labels:");
16 max = nfct_bitmask_maxbit(b);
17 for (i = 0; i <= max; i++) {
18 if (nfct_bitmask_test_bit(b, i))
19 printf("\t'%s' (%d)\n", map ? nfct_labelmap_get_name(map, i) : "", i);
20 }
21 }
22
data_cb(const struct nlmsghdr * nlh,void * data)23 static int data_cb(const struct nlmsghdr *nlh, void *data)
24 {
25 struct nf_conntrack *ct;
26 char buf[4096];
27
28 ct = nfct_new();
29 if (ct == NULL)
30 return MNL_CB_OK;
31
32 nfct_nlmsg_parse(nlh, ct);
33
34 nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, 0);
35 printf("%s\n", buf);
36
37 print_label(ct, data);
38
39 nfct_destroy(ct);
40
41 return MNL_CB_OK;
42 }
43
main(void)44 int main(void)
45 {
46 struct mnl_socket *nl;
47 struct nlmsghdr *nlh;
48 struct nfgenmsg *nfh;
49 char buf[MNL_SOCKET_BUFFER_SIZE];
50 unsigned int seq, portid;
51 int ret;
52 struct nfct_labelmap *l = nfct_labelmap_new(NULL);
53
54 nl = mnl_socket_open(NETLINK_NETFILTER);
55 if (nl == NULL) {
56 perror("mnl_socket_open");
57 exit(EXIT_FAILURE);
58 }
59
60 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
61 perror("mnl_socket_bind");
62 exit(EXIT_FAILURE);
63 }
64 portid = mnl_socket_get_portid(nl);
65
66 nlh = mnl_nlmsg_put_header(buf);
67 nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_GET;
68 nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP;
69 nlh->nlmsg_seq = seq = time(NULL);
70
71 nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg));
72 nfh->nfgen_family = AF_UNSPEC;
73 nfh->version = NFNETLINK_V0;
74 nfh->res_id = 0;
75
76
77 ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
78 if (ret == -1) {
79 perror("mnl_socket_sendto");
80 exit(EXIT_FAILURE);
81 }
82
83 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
84
85
86 while (ret > 0) {
87 ret = mnl_cb_run(buf, ret, seq, portid, data_cb, l);
88 if (ret <= MNL_CB_STOP)
89 break;
90 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
91 }
92 if (ret == -1) {
93 perror("mnl_socket_recvfrom");
94 exit(EXIT_FAILURE);
95 }
96
97 if (l)
98 nfct_labelmap_destroy(l);
99
100 mnl_socket_close(nl);
101
102 return 0;
103 }
104