libnetfilter_conntrack 1.1.0
conntrack_dump_filter_tuple.c
1#include <stdio.h>
2#include <stdlib.h>
3#include <string.h>
4#include <errno.h>
5#include <arpa/inet.h>
6
7#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
8
9static int cb(const struct nlmsghdr *nlh,
10 enum nf_conntrack_msg_type type,
11 struct nf_conntrack *ct,
12 void *data)
13{
14 char buf[1024];
15
16 if (!(nlh->nlmsg_flags & NLM_F_DUMP_FILTERED))
17 {
18 fprintf(stderr, "No filtering in kernel, do filtering in userspace\n");
19 return NFCT_CB_FAILURE;
20 }
21
22 nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, NFCT_OF_SHOW_LAYER3 | NFCT_OF_TIMESTAMP);
23 printf("%s\n", buf);
24
25 return NFCT_CB_CONTINUE;
26}
27
28int main(void)
29{
30 int ret;
31 struct nfct_handle *h;
32
33 h = nfct_open(CONNTRACK, 0);
34 if (!h) {
35 perror("nfct_open");
36 return -1;
37 }
38 struct nfct_filter_dump *filter_dump = nfct_filter_dump_create();
39 if (filter_dump == NULL) {
40 perror("nfct_filter_dump_alloc");
41 return -1;
42 }
43
44 struct nf_conntrack *ct;
45 ct = nfct_new();
46 if (!ct) {
47 perror("nfct_new");
48 return 0;
49 }
50
51 nfct_set_attr_u8(ct, ATTR_ORIG_L3PROTO, AF_INET);
52 nfct_set_attr_u8(ct, ATTR_L4PROTO, IPPROTO_ICMP);
53 nfct_set_attr_u32(ct, ATTR_ORIG_IPV4_DST, inet_addr("203.0.113.55"));
54 nfct_filter_dump_set_attr(filter_dump, NFCT_FILTER_DUMP_TUPLE, ct);
55
56 nfct_callback_register2(h, NFCT_T_ALL, cb, NULL);
57 ret = nfct_query(h, NFCT_Q_DUMP_FILTER, filter_dump);
58
59 nfct_filter_dump_destroy(filter_dump);
60
61 printf("TEST: get conntrack ");
62 if (ret == -1)
63 printf("(%d)(%s)\n", ret, strerror(errno));
64 else
65 printf("(OK)\n");
66
67 nfct_close(h);
68
69 ret == -1 ? exit(EXIT_FAILURE) : exit(EXIT_SUCCESS);
70}
struct nfct_handle * nfct_open(uint8_t, unsigned)
Definition main.c:84
int nfct_close(struct nfct_handle *cth)
Definition main.c:105
int nfct_callback_register2(struct nfct_handle *h, enum nf_conntrack_msg_type type, int(*cb)(const struct nlmsghdr *nlh, enum nf_conntrack_msg_type type, struct nf_conntrack *ct, void *data), void *data)
int nfct_query(struct nfct_handle *h, const enum nf_conntrack_query query, const void *data)
void nfct_set_attr_u32(struct nf_conntrack *ct, const enum nf_conntrack_attr type, uint32_t value)
void nfct_set_attr_u8(struct nf_conntrack *ct, const enum nf_conntrack_attr type, uint8_t value)
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 nf_conntrack * nfct_new(void)
struct nfct_filter_dump * nfct_filter_dump_create(void)
void nfct_filter_dump_destroy(struct nfct_filter_dump *filter)
void nfct_filter_dump_set_attr(struct nfct_filter_dump *filter_dump, const enum nfct_filter_dump_attr type, const void *data)