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* src/nf-monitor.c Monitor netfilter events
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation version 2.1
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* Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
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* Copyright (c) 2007 Philip Craig <philipc@snapgear.com>
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* Copyright (c) 2007 Secure Computing Corporation
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#include <netlink/cli/utils.h>
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#include <netlink/netfilter/nfnl.h>
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static void obj_input(struct nl_object *obj, void *arg)
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struct nl_dump_params dp = {
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.dp_type = NL_DUMP_STATS,
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nl_object_dump(obj, &dp);
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static int event_input(struct nl_msg *msg, void *arg)
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if (nl_msg_parse(msg, &obj_input, NULL) < 0)
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fprintf(stderr, "<<EVENT>> Unknown message type\n");
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/* Exit nl_recvmsgs_def() and return to the main select() */
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int main(int argc, char *argv[])
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enum nfnetlink_groups gr_id;
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{ NFNLGRP_CONNTRACK_NEW, "ct-new" },
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{ NFNLGRP_CONNTRACK_UPDATE, "ct-update" },
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{ NFNLGRP_CONNTRACK_DESTROY, "ct-destroy" },
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{ NFNLGRP_NONE, NULL }
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sock = nl_cli_alloc_socket();
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nl_socket_disable_seq_check(sock);
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nl_socket_modify_cb(sock, NL_CB_VALID, NL_CB_CUSTOM, event_input, NULL);
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if (argc > 1 && !strcasecmp(argv[1], "-h")) {
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printf("Usage: nf-monitor [<groups>]\n");
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printf("Known groups:");
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for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++)
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printf(" %s", groups[i].gr_name);
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nl_cli_connect(sock, NETLINK_NETFILTER);
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for (idx = 1; argc > idx; idx++) {
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for (i = 0; groups[i].gr_id != NFNLGRP_NONE; i++) {
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if (strcmp(argv[idx], groups[i].gr_name))
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err = nl_socket_add_membership(sock, groups[i].gr_id);
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"Unable to add membership: %s",
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if (groups[i].gr_id == NFNLGRP_NONE)
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nl_cli_fatal(NLE_OBJ_NOTFOUND, "Unknown group: \"%s\"",
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fd = nl_socket_get_fd(sock);
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/* wait for an incoming message on the netlink socket */
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retval = select(fd+1, &rfds, NULL, NULL, NULL);
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/* FD_ISSET(fd, &rfds) will be true */
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nl_recvmsgs_default(sock);