libnftnl  1.2.6
nft-chain-del.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 #include <stdlib.h>
13 #include <time.h>
14 #include <string.h>
15 #include <netinet/in.h>
16 
17 #include <linux/netfilter.h>
18 #include <linux/netfilter/nf_tables.h>
19 
20 #include <libmnl/libmnl.h>
21 #include <libnftnl/chain.h>
22 
23 static struct nftnl_chain *chain_del_parse(int argc, char *argv[])
24 {
25  struct nftnl_chain *t;
26 
27  t = nftnl_chain_alloc();
28  if (t == NULL) {
29  perror("OOM");
30  return NULL;
31  }
32 
33  nftnl_chain_set_str(t, NFTNL_CHAIN_TABLE, argv[2]);
34  nftnl_chain_set_str(t, NFTNL_CHAIN_NAME, argv[3]);
35 
36  return t;
37 }
38 
39 int main(int argc, char *argv[])
40 {
41  struct mnl_socket *nl;
42  struct mnl_nlmsg_batch *batch;
43  char buf[MNL_SOCKET_BUFFER_SIZE];
44  struct nlmsghdr *nlh;
45  uint32_t portid, seq, chain_seq;
46  struct nftnl_chain *t;
47  int ret, family;
48 
49  if (argc != 4) {
50  fprintf(stderr, "Usage: %s <family> <table> <chain>\n",
51  argv[0]);
52  exit(EXIT_FAILURE);
53  }
54 
55  if (strcmp(argv[1], "ip") == 0)
56  family = NFPROTO_IPV4;
57  else if (strcmp(argv[1], "ip6") == 0)
58  family = NFPROTO_IPV6;
59  else if (strcmp(argv[1], "inet") == 0)
60  family = NFPROTO_INET;
61  else if (strcmp(argv[1], "bridge") == 0)
62  family = NFPROTO_BRIDGE;
63  else if (strcmp(argv[1], "arp") == 0)
64  family = NFPROTO_ARP;
65  else {
66  fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp\n");
67  exit(EXIT_FAILURE);
68  }
69 
70  t = chain_del_parse(argc, argv);
71  if (t == NULL)
72  exit(EXIT_FAILURE);
73 
74  seq = time(NULL);
75  batch = mnl_nlmsg_batch_start(buf, sizeof(buf));
76 
77  nftnl_batch_begin(mnl_nlmsg_batch_current(batch), seq++);
78  mnl_nlmsg_batch_next(batch);
79 
80  chain_seq = seq;
81  nlh = nftnl_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch),
82  NFT_MSG_DELCHAIN, family, NLM_F_ACK, seq++);
83  nftnl_chain_nlmsg_build_payload(nlh, t);
84  nftnl_chain_free(t);
85  mnl_nlmsg_batch_next(batch);
86 
87  nftnl_batch_end(mnl_nlmsg_batch_current(batch), seq++);
88  mnl_nlmsg_batch_next(batch);
89 
90  nl = mnl_socket_open(NETLINK_NETFILTER);
91  if (nl == NULL) {
92  perror("mnl_socket_open");
93  exit(EXIT_FAILURE);
94  }
95 
96  if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
97  perror("mnl_socket_bind");
98  exit(EXIT_FAILURE);
99  }
100  portid = mnl_socket_get_portid(nl);
101 
102  if (mnl_socket_sendto(nl, mnl_nlmsg_batch_head(batch),
103  mnl_nlmsg_batch_size(batch)) < 0) {
104  perror("mnl_socket_send");
105  exit(EXIT_FAILURE);
106  }
107 
108  mnl_nlmsg_batch_stop(batch);
109 
110  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
111  while (ret > 0) {
112  ret = mnl_cb_run(buf, ret, chain_seq, portid, NULL, NULL);
113  if (ret <= 0)
114  break;
115  ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
116  }
117  if (ret == -1) {
118  perror("error");
119  exit(EXIT_FAILURE);
120  }
121  mnl_socket_close(nl);
122 
123  return EXIT_SUCCESS;
124 }