libnftnl  1.2.3
nft-ct-timeout-get.c
1 /*
2  * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
10  */
11 
12 
13 #include <stdlib.h>
14 #include <time.h>
15 #include <string.h>
16 #include <netinet/in.h>
17 
18 #include <linux/netfilter.h>
19 #include <linux/netfilter/nf_tables.h>
20 
21 #include <libmnl/libmnl.h>
22 #include <libnftnl/object.h>
23 
24 static int obj_cb(const struct nlmsghdr *nlh, void *data)
25 {
26  struct nftnl_obj *t;
27  char buf[4096];
28  uint32_t *type = data;
29 
30  t = nftnl_obj_alloc();
31  if (t == NULL) {
32  perror("OOM");
33  goto err;
34  }
35 
36  if (nftnl_obj_nlmsg_parse(nlh, t) < 0) {
37  perror("nftnl_obj_nlmsg_parse");
38  goto err_free;
39  }
40 
41  nftnl_obj_snprintf(buf, sizeof(buf), t, *type, 0);
42  printf("%s\n", buf);
43 
44 err_free:
45  nftnl_obj_free(t);
46 err:
47  return MNL_CB_OK;
48 }
49 
50 int main(int argc, char *argv[])
51 {
52  struct mnl_socket *nl;
53  char buf[MNL_SOCKET_BUFFER_SIZE];
54  struct nlmsghdr *nlh;
55  uint32_t portid, seq, family;
56  struct nftnl_obj *t = NULL;
57  int ret;
58  uint32_t type = NFTNL_OUTPUT_DEFAULT;
59 
60  if (argc < 3 || argc > 5) {
61  fprintf(stderr, "%s <family> <table> [<obj>]\n", argv[0]);
62  return EXIT_FAILURE;
63  }
64 
65  if (strcmp(argv[1], "ip") == 0)
66  family = NFPROTO_IPV4;
67  else if (strcmp(argv[1], "ip6") == 0)
68  family = NFPROTO_IPV6;
69  else if (strcmp(argv[1], "inet") == 0)
70  family = NFPROTO_INET;
71  else if (strcmp(argv[1], "unspec") == 0)
72  family = NFPROTO_UNSPEC;
73  else {
74  fprintf(stderr, "Unknown family: ip, ip6, inet, unspec");
75  exit(EXIT_FAILURE);
76  }
77 
78  if (argc == 3 || argc == 4) {
79  t = nftnl_obj_alloc();
80  if (t == NULL) {
81  perror("OOM");
82  exit(EXIT_FAILURE);
83  }
84  }
85 
86  seq = time(NULL);
87  nftnl_obj_set_u32(t, NFTNL_OBJ_TYPE, NFT_OBJECT_CT_TIMEOUT);
88  if (argc < 4) {
89  nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family,
90  NLM_F_DUMP, seq);
91  if (argc == 3) {
92  nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
93  nftnl_obj_nlmsg_build_payload(nlh, t);
94  nftnl_obj_free(t);
95  }
96  } else {
97  nftnl_obj_set_str(t, NFTNL_OBJ_TABLE, argv[2]);
98  nftnl_obj_set_str(t, NFTNL_OBJ_NAME, argv[3]);
99 
100  nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETOBJ, family,
101  NLM_F_ACK, seq);
102  nftnl_obj_nlmsg_build_payload(nlh, t);
103  nftnl_obj_free(t);
104  }
105 
106  nl = mnl_socket_open(NETLINK_NETFILTER);
107  if (nl == NULL) {
108  perror("mnl_socket_open");
109  exit(EXIT_FAILURE);
110  }
111 
112  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
113  perror("mnl_socket_bind");
114  exit(EXIT_FAILURE);
115  }
116  portid = mnl_socket_get_portid(nl);
117 
118  if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
119  perror("mnl_socket_send");
120  exit(EXIT_FAILURE);
121  }
122 
123  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
124  while (ret > 0) {
125  ret = mnl_cb_run(buf, ret, seq, portid, obj_cb, &type);
126  if (ret <= 0)
127  break;
128  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
129  }
130  if (ret == -1) {
131  perror("error");
132  exit(EXIT_FAILURE);
133  }
134  mnl_socket_close(nl);
135 
136  return EXIT_SUCCESS;
137 }