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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
static int cb(const struct nlmsghdr *nlh,
enum nf_conntrack_msg_type type,
struct nf_conntrack *ct,
void *data)
{
char buf[1024];
if (!(nlh->nlmsg_flags & NLM_F_DUMP_FILTERED))
{
fprintf(stderr, "No filtering in kernel, do filtering in userspace\n");
return NFCT_CB_FAILURE;
}
nfct_snprintf(buf, sizeof(buf), ct, NFCT_T_UNKNOWN, NFCT_O_DEFAULT, NFCT_OF_SHOW_LAYER3 | NFCT_OF_TIMESTAMP);
printf("%s\n", buf);
return NFCT_CB_CONTINUE;
}
int main(void)
{
int ret;
struct nfct_handle *h;
h = nfct_open(CONNTRACK, 0);
if (!h) {
perror("nfct_open");
return -1;
}
struct nfct_filter_dump *filter_dump = nfct_filter_dump_create();
if (filter_dump == NULL) {
perror("nfct_filter_dump_alloc");
return -1;
}
struct nf_conntrack *ct;
ct = nfct_new();
if (!ct) {
perror("nfct_new");
return 0;
}
nfct_set_attr_u8(ct, ATTR_ORIG_L3PROTO, AF_INET);
nfct_set_attr_u8(ct, ATTR_L4PROTO, IPPROTO_ICMP);
nfct_set_attr_u32(ct, ATTR_ORIG_IPV4_DST, inet_addr("203.0.113.55"));
nfct_filter_dump_set_attr(filter_dump, NFCT_FILTER_DUMP_TUPLE, ct);
nfct_callback_register2(h, NFCT_T_ALL, cb, NULL);
ret = nfct_query(h, NFCT_Q_DUMP_FILTER, filter_dump);
nfct_filter_dump_destroy(filter_dump);
printf("TEST: get conntrack ");
if (ret == -1)
printf("(%d)(%s)\n", ret, strerror(errno));
else
printf("(OK)\n");
nfct_close(h);
ret == -1 ? exit(EXIT_FAILURE) : exit(EXIT_SUCCESS);
}
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