# -*- tab-width: 4 -*- ;; Emacs
# vi: set filetype=sh tabstop=8 shiftwidth=8 noexpandtab :: Vi/ViM
############################################################ IDENT(1)
#
# $Title: dwatch(8) module for dtrace_udp(4) $
# $Copyright: 2014-2018 Devin Teske. All rights reserved. $
#
############################################################ DESCRIPTION
#
# Display local/remote UDP addresses/ports and bytes sent/received for UDP I/O
#
############################################################ PROBE

case "$PROFILE" in
udp) : ${PROBE:=udp:::send, udp:::receive} ;;
  *) : ${PROBE:=udp:::${PROFILE#udp-}}
esac

############################################################ ACTIONS

exec 9<<EOF
this string	flow;
this string	local;
this string	remote;
this u_char	local6;
this u_char	recv;
this u_char	remote6;
this uint16_t	length;
this uint16_t	lport;
this uint16_t	rport;

$PROBE /* probe ID $ID */
{${TRACE:+
	printf("<$ID>");
}
	/*
	 * dtrace_udp(4)
	 */
	this->recv = probename == "receive" ? 1 : 0;
	this->flow = this->recv ? "<-" : "->";

	/*
	 * ipinfo_t *
	 */
	this->local  = this->recv ? args[2]->ip_daddr : args[2]->ip_saddr;
	this->remote = this->recv ? args[2]->ip_saddr : args[2]->ip_daddr;

	/*
	 * udpinfo_t *
	 */
	this->length = (uint16_t)args[4]->udp_length;
	this->lport  = this->recv ? args[4]->udp_dport : args[4]->udp_sport;
	this->rport  = this->recv ? args[4]->udp_sport : args[4]->udp_dport;

	/*
	 * IPv6 support
	 */
	this->local6 = strstr(this->local, ":") != NULL ? 1 : 0;
	this->remote6 = strstr(this->remote, ":") != NULL ? 1 : 0;
	this->local = strjoin(strjoin(this->local6 ? "[" : "",
		this->local), this->local6 ? "]" : "");
	this->remote = strjoin(strjoin(this->remote6 ? "[" : "",
		this->remote), this->remote6 ? "]" : "");
}
EOF
ACTIONS=$( cat <&9 )
ID=$(( $ID + 1 ))

############################################################ EVENT DETAILS

if [ ! "$CUSTOM_DETAILS" ]; then
exec 9<<EOF
	/*
	 * Print network I/O details
	 */
	printf("%s:%u %s %s:%u %d byte%s",
		this->local, this->lport,
		this->flow,
		this->remote, this->rport,
		this->length,
		this->length == 1 ? "" : "s");
EOF
EVENT_DETAILS=$( cat <&9 )
fi

################################################################################
# END
################################################################################