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
8static 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
23static 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
44int 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