#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
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#include <libnetfilter_conntrack/libnetfilter_conntrack_tcp.h>
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static int event_cb(enum nf_conntrack_msg_type type,
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struct nf_conntrack *ct,
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void *data)
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{
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static int n = 0;
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char buf[1024];
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nfct_snprintf(buf, sizeof(buf), ct, type, NFCT_O_PLAIN, NFCT_OF_TIME);
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printf("%s\n", buf);
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if (++n == 10)
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return NFCT_CB_STOP;
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return NFCT_CB_CONTINUE;
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}
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int main(void)
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{
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int ret;
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struct nfct_handle *h;
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struct nfct_filter *filter;
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h = nfct_open(CONNTRACK, NF_NETLINK_CONNTRACK_NEW |
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NF_NETLINK_CONNTRACK_UPDATE);
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if (!h) {
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perror("nfct_open");
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return 0;
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}
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filter = nfct_filter_create();
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if (!filter) {
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perror("nfct_create_filter");
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return 0;
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}
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nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_UDP);
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nfct_filter_add_attr_u32(filter, NFCT_FILTER_L4PROTO, IPPROTO_TCP);
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struct nfct_filter_proto filter_proto = {
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.proto = IPPROTO_TCP,
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.state = TCP_CONNTRACK_ESTABLISHED
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};
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nfct_filter_add_attr(filter, NFCT_FILTER_L4PROTO_STATE, &filter_proto);
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/* BSF always wants data in host-byte order */
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struct nfct_filter_ipv4 filter_ipv4 = {
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.addr = ntohl(inet_addr("127.0.0.1")),
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.mask = 0xffffffff,
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};
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/* ignore whatever that comes from 127.0.0.1 */
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nfct_filter_set_logic(filter,
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NFCT_FILTER_SRC_IPV4,
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NFCT_FILTER_LOGIC_NEGATIVE);
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nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV4, &filter_ipv4);
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/* BSF always wants data in host-byte order */
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struct nfct_filter_ipv6 filter_ipv6 = {
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.addr = { 0x0, 0x0, 0x0, 0x1 },
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.mask = { 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff },
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};
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/* ignore whatever that comes from ::1 (loopback) */
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nfct_filter_set_logic(filter,
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NFCT_FILTER_SRC_IPV6,
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NFCT_FILTER_LOGIC_NEGATIVE);
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nfct_filter_add_attr(filter, NFCT_FILTER_SRC_IPV6, &filter_ipv6);
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if (nfct_filter_attach(nfct_fd(h), filter) == -1) {
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perror("nfct_filter_attach");
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return 0;
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}
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/* release the filter object, this does not detach the filter */
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nfct_filter_destroy(filter);
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nfct_callback_register(h, NFCT_T_ALL, event_cb, NULL);
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printf("TEST: waiting for 10 events...\n");
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ret = nfct_catch(h);
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printf("TEST: conntrack events ");
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if (ret == -1)
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printf("(%d)(%s)\n", ret, strerror(errno));
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else
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printf("(OK)\n");
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nfct_close(h);
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ret == -1 ? exit(EXIT_FAILURE) : exit(EXIT_SUCCESS);
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}
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