libnetfilter_cthelper  1.0.1
nfct-helper-add.c
1 /* This example is in the public domain. */
2 #include <stdlib.h>
3 #include <time.h>
4 #include <string.h>
5 #include <netinet/in.h>
6 #include <libmnl/libmnl.h>
7 #include <libnetfilter_cthelper/libnetfilter_cthelper.h>
8 
9 int main(int argc, char *argv[])
10 {
11  struct mnl_socket *nl;
12  char buf[MNL_SOCKET_BUFFER_SIZE];
13  struct nlmsghdr *nlh;
14  uint32_t portid, seq;
15  struct nfct_helper *nfct_helper;
16  struct nfct_helper_policy *p;
17  int ret;
18 
19  if (argc != 3) {
20  printf("Usage: %s [helper-name] [queue-num]\n", argv[0]);
21  exit(EXIT_FAILURE);
22  }
23 
25  if (nfct_helper == NULL) {
26  perror("OOM");
27  exit(EXIT_FAILURE);
28  }
29 
30  nfct_helper_attr_set(nfct_helper, NFCTH_ATTR_NAME, argv[1]);
31  nfct_helper_attr_set_u32(nfct_helper, NFCTH_ATTR_QUEUE_NUM, atoi(argv[2]));
32  nfct_helper_attr_set_u16(nfct_helper, NFCTH_ATTR_PROTO_L3NUM, AF_INET);
33  nfct_helper_attr_set_u8(nfct_helper, NFCTH_ATTR_PROTO_L4NUM, IPPROTO_TCP);
34  nfct_helper_attr_set_u32(nfct_helper, NFCTH_ATTR_PRIV_DATA_LEN, 0);
35 
36  /* Will be freed by nfct_helper_free. */
38  if (p == NULL) {
39  perror("OOM");
40  exit(EXIT_FAILURE);
41  }
42  nfct_helper_policy_attr_set(p, NFCTH_ATTR_POLICY_NAME, "test");
43  nfct_helper_policy_attr_set_u32(p, NFCTH_ATTR_POLICY_TIMEOUT, 100);
44  nfct_helper_policy_attr_set_u32(p, NFCTH_ATTR_POLICY_MAX, 100);
45 
46  nfct_helper_attr_set(nfct_helper, NFCTH_ATTR_POLICY, p);
47 
48  seq = time(NULL);
49  nlh = nfct_helper_nlmsg_build_hdr(buf, NFNL_MSG_CTHELPER_NEW,
50  NLM_F_CREATE | NLM_F_ACK, seq);
52 
54 
55  nl = mnl_socket_open(NETLINK_NETFILTER);
56  if (nl == NULL) {
57  perror("mnl_socket_open");
58  exit(EXIT_FAILURE);
59  }
60 
61  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
62  perror("mnl_socket_bind");
63  exit(EXIT_FAILURE);
64  }
65  portid = mnl_socket_get_portid(nl);
66 
67  if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
68  perror("mnl_socket_send");
69  exit(EXIT_FAILURE);
70  }
71 
72  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
73  while (ret > 0) {
74  ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
75  if (ret <= 0)
76  break;
77  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
78  }
79  if (ret == -1) {
80  perror("error");
81  exit(EXIT_FAILURE);
82  }
83  mnl_socket_close(nl);
84 
85  return EXIT_SUCCESS;
86 }
void nfct_helper_policy_attr_set(struct nfct_helper_policy *p, enum nfct_helper_policy_attr_type type, const void *data)
struct nfct_helper * nfct_helper_alloc(void)
void nfct_helper_free(struct nfct_helper *h)
void nfct_helper_attr_set(struct nfct_helper *nfct_helper, enum nfct_helper_attr_type type, const void *data)
struct nfct_helper_policy * nfct_helper_policy_alloc(void)
void nfct_helper_nlmsg_build_payload(struct nlmsghdr *nlh, struct nfct_helper *nfct_helper)
struct nlmsghdr * nfct_helper_nlmsg_build_hdr(char *buf, uint8_t cmd, uint16_t flags, uint32_t seq)