function conn_id_string(id: conn_id): string
	{
	return fmt("%s/%d=>%s/%s",
		id$orig_h, id$orig_p,
		id$resp_h, id$resp_p);
	}

function connection_state(c: connection, trans: transport_proto): string
	{
	local os = c$orig$state;
	local rs = c$resp$state;

	local o_inactive = os == TCP_INACTIVE || os == TCP_PARTIAL;
	local r_inactive = rs == TCP_INACTIVE || rs == TCP_PARTIAL;

	if ( trans == tcp )
		{
		if ( rs == TCP_RESET )
			{
			if ( os == TCP_SYN_SENT || os == TCP_SYN_ACK_SENT ||
			     (os == TCP_RESET &&
			      c$orig$size == 0 && c$resp$size == 0) )
				return "REJ";
			else if ( o_inactive )
				return "RSTRH";
			else
				return "RSTR";
			}
		else if ( os == TCP_RESET )
			return r_inactive ? "RSTOS0" : "RSTO";
		else if ( rs == TCP_CLOSED && os == TCP_CLOSED )
			return "SF";
		else if ( os == TCP_CLOSED )
			return r_inactive ? "SH" : "S2";
		else if ( rs == TCP_CLOSED )
			return o_inactive ? "SHR" : "S3";
		else if ( os == TCP_SYN_SENT && rs == TCP_INACTIVE )
			return "S0";
		else if ( os == TCP_ESTABLISHED && rs == TCP_ESTABLISHED )
			return "S1";
		else
			return "OTH";
		}

	else if ( trans == udp )
		{
		if ( os == UDP_ACTIVE )
			return rs == UDP_ACTIVE ? "SF" : "S0";
		else
			return rs == UDP_ACTIVE ? "SHR" : "OTH";
		}

	else
		return "OTH";
	}