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/*
* src/nf-monitor.c Monitor netfilter 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) 2003-2008 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
* Copyright (c) 2007 Secure Computing Corporation
*/
#include <netlink/cli/utils.h>
#include <netlink/netfilter/nfnl.h>
static void obj_input(struct nl_object *obj, void *arg)
{
struct nl_dump_params dp = {
.dp_type = NL_DUMP_STATS,
.dp_fd = stdout,
.dp_dump_msgtype = 1,
};
nl_object_dump(obj, &dp);
}
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 *sock;
int err;
int i, idx;
static const struct {
enum nfnetlink_groups gr_id;
const char* gr_name;
} groups[] = {
{ NFNLGRP_CONNTRACK_NEW, "ct-new" },
{ NFNLGRP_CONNTRACK_UPDATE, "ct-update" },
{ NFNLGRP_CONNTRACK_DESTROY, "ct-destroy" },
{ NFNLGRP_NONE, NULL }
};
sock = nl_cli_alloc_socket();
nl_socket_disable_seq_check(sock);
nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
if (argc > 1 && !strcasecmp(argv[1], "-h")) {
printf("Usage: nf-monitor [<groups>]\n");
printf("Known groups:");
for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++)
printf(" %s", groups[i].gr_name);
printf("\n");
return 2;
}
nl_cli_connect(sock, NETLINK_NETFILTER);
for (idx = 1; argc > idx; idx++) {
for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++) {
if (strcmp(argv[idx], groups[i].gr_name))
continue;
err = nl_socket_add_membership(sock, groups[i].gr_id);
if (err < 0)
nl_cli_fatal(err,
"Unable to add membership: %s",
nl_geterror(err));
break;
}
if (groups[i].gr_id == NFNLGRP_NONE)
nl_cli_fatal(NLE_OBJ_NOTFOUND, "Unknown group: \"%s\"",
argv[idx]);
}
while (1) {
fd_set rfds;
int fd, retval;
fd = nl_socket_get_fd(sock);
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
/* wait for an incoming message on the netlink socket */
retval = select(fd+1, &rfds, NULL, NULL, NULL);
if (retval) {
/* FD_ISSET(fd, &rfds) will be true */
nl_recvmsgs_default(sock);
}
}
return 0;
}
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