libnetfilter_conntrack 1.0.9
test_filter.c
1/*
2 * Test for the filter API
3 */
4
5#include <stdio.h>
6#include <stdlib.h>
7#include <string.h>
8#include <arpa/inet.h>
9#include <errno.h>
10
11#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
12
13static int event_cb(enum nf_conntrack_msg_type type,
14 struct nf_conntrack *ct,
15 void *data)
16{
17 static int n = 0;
18 char buf[1024];
19
20 nfct_snprintf(buf, sizeof(buf), ct, type, NFCT_O_PLAIN, NFCT_OF_TIME);
21 printf("%s\n", buf);
22
23 if (++n == 10)
24 return NFCT_CB_STOP;
25
26 return NFCT_CB_CONTINUE;
27}
28
29int main(void)
30{
31 int i, ret;
32 struct nfct_handle *h;
33 struct nfct_filter *filter;
34
35 h = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW |
36 NF_NETLINK_CONNTRACK_UPDATE);
37 if (!h) {
38 perror("nfct_open");
39 return 0;
40 }
41
42 filter = nfct_filter_create();
43 if (!filter) {
44 perror("nfct_create_filter");
45 return 0;
46 }
47
48 if (nfct_filter_attach(nfct_fd(h), filter) == -1) {
49 perror("nfct_filter_attach");
50 return 0;
51 }
52
53 /* protocol 255 is skipped since we support up to 255 protocols max */
54 for (i=0; i<IPPROTO_MAX; i++)
55 nfct_filter_add_attr_u32(filter,NFCT_FILTER_L4PROTO,i);
56
57 /* up to 127 IP addresses, above that adding is noop */
58 for (i=0; i<128; i++) {
59 /* BSF always wants data in host-byte order */
60 struct nfct_filter_ipv4 fltr_ipv4 = {
61 .addr = ntohl(inet_addr("127.0.0.1")) + i,
62 .mask = 0xffffffff,
63 };
64 nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &fltr_ipv4);
65 };
66
67 if (nfct_filter_attach(nfct_fd(h), filter) == -1) {
68 perror("nfct_filter_attach");
69 return 0;
70 }
71
72 nfct_filter_destroy(filter);
73
74 nfct_callback_register(h, NFCT_T_ALL, event_cb, NULL);
75
76 ret = nfct_catch(h);
77 printf("test ret=%d (%s)\n", ret, strerror(errno));
78 return EXIT_SUCCESS;
79}
int nfct_callback_register(struct nfct_handle *h, enum nf_conntrack_msg_type type, int(*cb)(enum nf_conntrack_msg_type type, struct nf_conntrack *ct, void *data), void *data)
struct nfct_handle * nfct_open(uint8_t, unsigned)
Definition main.c:84
int nfct_fd(struct nfct_handle *cth)
Definition main.c:144
void nfct_filter_destroy(struct nfct_filter *filter)
int nfct_filter_attach(int fd, struct nfct_filter *filter)
void nfct_filter_add_attr_u32(struct nfct_filter *filter, const enum nfct_filter_attr attr, const uint32_t value)
void nfct_filter_add_attr(struct nfct_filter *filter, const enum nfct_filter_attr attr, const void *value)
struct nfct_filter * nfct_filter_create(void)
int nfct_catch(struct nfct_handle *h)
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)