libnetfilter_conntrack  1.0.6
nfct-mnl-dump-labels.c
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 
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 
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 
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)
99 
100  mnl_socket_close(nl);
101 
102  return 0;
103 }
const char * nfct_labelmap_get_name(struct nfct_labelmap *m, unsigned int bit)
void nfct_destroy(struct nf_conntrack *ct)
Definition: conntrack/api.c:92
int nfct_snprintf(char *buf, unsigned int size, const struct nf_conntrack *ct, const unsigned int msg_type, const unsigned int out_type, const unsigned int out_flags)
struct nfct_labelmap * nfct_labelmap_new(const char *mapfile)
struct nf_conntrack * nfct_new(void)
Definition: conntrack/api.c:75
const void * nfct_get_attr(const struct nf_conntrack *ct, const enum nf_conntrack_attr type)
void nfct_labelmap_destroy(struct nfct_labelmap *map)