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/*
* src/nf-queue.c Monitor netfilter queue events
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation version 2.1
* of the License.
*
* Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2010 Karl Hiramoto <karl@hiramoto.org>
*/
#include <netlink/cli/utils.h>
#include <netlink/cli/link.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <netlink/netfilter/nfnl.h>
#include <netlink/netfilter/queue.h>
#include <netlink/netfilter/queue_msg.h>
static struct nl_sock *nf_sock;
static struct nfnl_queue *alloc_queue(void)
{
struct nfnl_queue *queue;
queue = nfnl_queue_alloc();
if (!queue)
nl_cli_fatal(ENOMEM, "Unable to allocate queue object");
return queue;
}
static void obj_input(struct nl_object *obj, void *arg)
{
struct nfnl_queue_msg *msg = (struct nfnl_queue_msg *) obj;
struct nl_dump_params dp = {
.dp_type = NL_DUMP_STATS,
.dp_fd = stdout,
.dp_dump_msgtype = 1,
};
nfnl_queue_msg_set_verdict(msg, NF_ACCEPT);
nl_object_dump(obj, &dp);
nfnl_queue_msg_send_verdict(nf_sock, msg);
}
static int event_input(struct nl_msg *msg, void *arg)
{
if (nl_msg_parse(msg, &obj_input, NULL) < 0)
fprintf(stderr, "<<EVENT>> Unknown message type\n");
/* Exit nl_recvmsgs_def() and return to the main select() */
return NL_STOP;
}
int main(int argc, char *argv[])
{
struct nl_sock *rt_sock;
struct nl_cache *link_cache;
struct nfnl_queue *queue;
enum nfnl_queue_copy_mode copy_mode;
uint32_t copy_range;
int err = 1;
int family;
nf_sock = nfnl_queue_socket_alloc();
if (nf_sock == NULL)
nl_cli_fatal(ENOBUFS, "Unable to allocate netlink socket");
nl_socket_disable_seq_check(nf_sock);
nl_socket_modify_cb(nf_sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
if ((argc > 1 && !strcasecmp(argv[1], "-h")) || argc < 3) {
printf("Usage: nf-queue family group [ copy_mode ] "
"[ copy_range ]\n");
printf("family: [ inet | inet6 | ... ] \n");
printf("group: the --queue-num arg that you gave to iptables\n");
printf("copy_mode: [ none | meta | packet ] \n");
return 2;
}
nl_cli_connect(nf_sock, NETLINK_NETFILTER);
if ((family = nl_str2af(argv[1])) == AF_UNSPEC)
nl_cli_fatal(NLE_INVAL, "Unknown family \"%s\"", argv[1]);
nfnl_queue_pf_unbind(nf_sock, family);
if ((err = nfnl_queue_pf_bind(nf_sock, family)) < 0)
nl_cli_fatal(err, "Unable to bind logger: %s",
nl_geterror(err));
queue = alloc_queue();
nfnl_queue_set_group(queue, atoi(argv[2]));
copy_mode = NFNL_QUEUE_COPY_PACKET;
if (argc > 3) {
copy_mode = nfnl_queue_str2copy_mode(argv[3]);
if (copy_mode < 0)
nl_cli_fatal(copy_mode,
"Unable to parse copy mode \"%s\": %s",
argv[3], nl_geterror(copy_mode));
}
nfnl_queue_set_copy_mode(queue, copy_mode);
copy_range = 0xFFFF;
if (argc > 4)
copy_range = atoi(argv[4]);
nfnl_queue_set_copy_range(queue, copy_range);
if ((err = nfnl_queue_create(nf_sock, queue)) < 0)
nl_cli_fatal(err, "Unable to bind queue: %s", nl_geterror(err));
rt_sock = nl_cli_alloc_socket();
nl_cli_connect(rt_sock, NETLINK_ROUTE);
link_cache = nl_cli_link_alloc_cache(rt_sock);
nl_socket_set_buffer_size(nf_sock, 1024*127, 1024*127);
while (1) {
fd_set rfds;
int nffd, rtfd, maxfd, retval;
FD_ZERO(&rfds);
maxfd = nffd = nl_socket_get_fd(nf_sock);
FD_SET(nffd, &rfds);
rtfd = nl_socket_get_fd(rt_sock);
FD_SET(rtfd, &rfds);
if (maxfd < rtfd)
maxfd = rtfd;
/* wait for an incoming message on the netlink socket */
retval = select(maxfd+1, &rfds, NULL, NULL, NULL);
if (retval) {
if (FD_ISSET(nffd, &rfds))
nl_recvmsgs_default(nf_sock);
if (FD_ISSET(rtfd, &rfds))
nl_recvmsgs_default(rt_sock);
}
}
return 0;
}
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