libnftnl 1.2.9
nft-set-get.c
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
4 *
5 * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
6 */
7
8#include <stdlib.h>
9#include <time.h>
10#include <string.h>
11#include <netinet/in.h>
12
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
15
16#include <libmnl/libmnl.h>
17#include <libnftnl/set.h>
18
19static int set_cb(const struct nlmsghdr *nlh, void *data)
20{
21 struct nftnl_set *t;
22 char buf[4096];
23 uint32_t *type = data;
24
25 t = nftnl_set_alloc();
26 if (t == NULL) {
27 perror("OOM");
28 goto err;
29 }
30
31 if (nftnl_set_nlmsg_parse(nlh, t) < 0) {
32 perror("nftnl_set_nlmsg_parse");
33 goto err_free;
34 }
35
36 nftnl_set_snprintf(buf, sizeof(buf), t, *type, 0);
37 printf("%s\n", buf);
38
39err_free:
40 nftnl_set_free(t);
41err:
42 return MNL_CB_OK;
43}
44
45int main(int argc, char *argv[])
46{
47 struct mnl_socket *nl;
48 char buf[MNL_SOCKET_BUFFER_SIZE];
49 struct nlmsghdr *nlh;
50 uint32_t portid, seq, family;
51 uint32_t type = NFTNL_OUTPUT_DEFAULT;
52 struct nftnl_set *t = NULL;
53 int ret;
54
55 if (argc < 2 || argc > 3) {
56 fprintf(stderr, "%s <family>\n", argv[0]);
57 return EXIT_FAILURE;
58 }
59 t = nftnl_set_alloc();
60 if (t == NULL) {
61 perror("OOM");
62 exit(EXIT_FAILURE);
63 }
64 seq = time(NULL);
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], "bridge") == 0)
72 family = NFPROTO_BRIDGE;
73 else if (strcmp(argv[1], "arp") == 0)
74 family = NFPROTO_ARP;
75 else if (strcmp(argv[1], "unspec") == 0)
76 family = NFPROTO_UNSPEC;
77 else {
78 fprintf(stderr, "Unknown family: ip, ip6, inet, bridge, arp, unspec\n");
79 exit(EXIT_FAILURE);
80 }
81
82 nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETSET, family,
83 NLM_F_DUMP | NLM_F_ACK, seq);
84 /* Use this below if you want to obtain sets per table */
85/* nftnl_set_set(t, NFT_SET_TABLE, argv[2]); */
86 nftnl_set_nlmsg_build_payload(nlh, t);
87 nftnl_set_free(t);
88
89 nl = mnl_socket_open(NETLINK_NETFILTER);
90 if (nl == NULL) {
91 perror("mnl_socket_open");
92 exit(EXIT_FAILURE);
93 }
94
95 if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) {
96 perror("mnl_socket_bind");
97 exit(EXIT_FAILURE);
98 }
99 portid = mnl_socket_get_portid(nl);
100
101 if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) {
102 perror("mnl_socket_send");
103 exit(EXIT_FAILURE);
104 }
105
106 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
107 while (ret > 0) {
108 ret = mnl_cb_run(buf, ret, seq, portid, set_cb, &type);
109 if (ret <= 0)
110 break;
111 ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
112 }
113 if (ret == -1) {
114 perror("error");
115 exit(EXIT_FAILURE);
116 }
117 mnl_socket_close(nl);
118
119 return EXIT_SUCCESS;
120}