nfct-mnl-dump.c revision 8a44513648da0c5f5551f96b329cf56b66f5b303 
1#include <stdio.h>
2#include <stdlib.h>
3#include <unistd.h>
4#include <time.h>
5#include <arpa/inet.h>
6
7#include <libmnl/libmnl.h>
8#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
9
10static int data_cb(const struct nlmsghdr *nlh, void *data)
11{
12	struct nf_conntrack *ct;
13	char buf[4096];
14
15	ct = nfct_new();
16	if (ct == NULL)
17		return MNL_CB_OK;
18
19	nfct_nlmsg_parse(nlh, ct);
20
21	nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, 0);
22	printf("%s\n", buf);
23
24	nfct_destroy(ct);
25
26	return MNL_CB_OK;
27}
28
29int main(void)
30{
31	struct mnl_socket *nl;
32	struct nlmsghdr *nlh;
33	struct nfgenmsg *nfh;
34	char buf[MNL_SOCKET_BUFFER_SIZE];
35	unsigned int seq, portid;
36	int ret;
37
38	nl = mnl_socket_open(NETLINK_NETFILTER);
39	if (nl == NULL) {
40		perror("mnl_socket_open");
41		exit(EXIT_FAILURE);
42	}
43
44	if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
45		perror("mnl_socket_bind");
46		exit(EXIT_FAILURE);
47	}
48	portid = mnl_socket_get_portid(nl);
49
50	nlh = mnl_nlmsg_put_header(buf);
51	nlh->nlmsg_type = (NFNL_SUBSYS_CTNETLINK << 8) | IPCTNL_MSG_CT_GET;
52	nlh->nlmsg_flags = NLM_F_REQUEST|NLM_F_DUMP;
53	nlh->nlmsg_seq = seq = time(NULL);
54
55	nfh = mnl_nlmsg_put_extra_header(nlh, sizeof(struct nfgenmsg));
56	nfh->nfgen_family = AF_INET;
57	nfh->version = NFNETLINK_V0;
58	nfh->res_id = 0;
59
60	ret = mnl_socket_sendto(nl, nlh, nlh->nlmsg_len);
61	if (ret == -1) {
62		perror("mnl_socket_recvfrom");
63		exit(EXIT_FAILURE);
64	}
65
66	ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
67	while (ret > 0) {
68		ret = mnl_cb_run(buf, ret, seq, portid, data_cb, NULL);
69		if (ret <= MNL_CB_STOP)
70			break;
71		ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
72	}
73	if (ret == -1) {
74		perror("mnl_socket_recvfrom");
75		exit(EXIT_FAILURE);
76	}
77
78	mnl_socket_close(nl);
79
80	return 0;
81}
82