#!/usr/sbin/dtrace -s
/*
 * Copyright (c) 2015 George V. Neville-Neil
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The tcptrack D script shows various information about TCP
 * connections including acceptance and refusal of inbound and
 * outbound connections as well as state changes.
 *
 * Usage: tcptrack
 */

#pragma D option quiet
tcp:kernel::accept-established
{
	printf("Accept connection from %s:%d\tto %s:%d\n",
		       args[2]->ip_saddr,
		       args[4]->tcp_sport,
		       args[2]->ip_daddr,
		       args[4]->tcp_dport);

}

tcp:kernel::accept-refused
{
	printf("Refused connection from %s:%d\tto %s:%d\n", 
		       args[2]->ip_daddr,
		       args[4]->tcp_dport,
		       args[2]->ip_saddr,
		       args[4]->tcp_sport);

}

tcp:kernel::connect-established
{
	printf("Connection established to %s:%d from %s:%d\n",
		       args[2]->ip_saddr,
		       args[4]->tcp_sport,
		       args[2]->ip_daddr,
		       args[4]->tcp_dport);

}

tcp:kernel::connect-refused
{
	printf("Connection refused by %s:%d from %s:%d\n", 
		       args[2]->ip_saddr,
		       args[4]->tcp_sport,
		       args[2]->ip_daddr,
		       args[4]->tcp_dport);
}

tcp:kernel::state-change
{
	newstate = args[3]->tcps_state;
	oldstate = args[5]->tcps_state;
	printf("State changed from %s\t\t%s\n", tcp_state_string[oldstate],
				     tcp_state_string[newstate]);
}