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rrd.php

<?php
/*
 +-------------------------------------------------------------------------+
 | Copyright (C) 2004 Ian Berry                                            |
 |                                                                         |
 | This program is free software; you can redistribute it and/or           |
 | modify it under the terms of the GNU General Public License             |
 | as published by the Free Software Foundation; either version 2          |
 | of the License, or (at your option) any later version.                  |
 |                                                                         |
 | This program is distributed in the hope that it will be useful,         |
 | but WITHOUT ANY WARRANTY; without even the implied warranty of          |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           |
 | GNU General Public License for more details.                            |
 +-------------------------------------------------------------------------+
 | cacti: a php-based graphing solution                                    |
 +-------------------------------------------------------------------------+
 | Most of this code has been designed, written and is maintained by       |
 | Ian Berry. See about.php for specific developer credit. Any questions   |
 | or comments regarding this code should be directed to:                  |
 | - iberry@raxnet.net                                                     |
 +-------------------------------------------------------------------------+
 | - raXnet - http://www.raxnet.net/                                       |
 +-------------------------------------------------------------------------+
*/

define("RRD_NL", " \\\n");
define("MAX_FETCH_CACHE_SIZE", 5);

function escape_command($command) {
      return ereg_replace("(\\\$|`)", "", $command);
}

function rrd_init() {
      /* set the rrdtool default font */
      if (read_config_option("path_rrdtool_default_font")) {
            putenv("RRD_DEFAULT_FONT=" . read_config_option("path_rrdtool_default_font"));
      }

      $rrd_struc["fd"] = popen(read_config_option("path_rrdtool") . " -", "w");

      return $rrd_struc;
}

function rrd_close($rrd_struc) {
      /* close the rrdtool file descriptor */
      pclose($rrd_struc["fd"]);
}

function rrd_get_fd(&$rrd_struc, $fd_type) {
      if (sizeof($rrd_struc) == 0) {
            return 0;
      }else{
            return $rrd_struc["fd"];
      }
}

function rrdtool_execute($command_line, $log_to_stdout, $output_flag, $rrd_struc = array(), $logopt = "WEBLOG") {
      global $config;

      if (!is_numeric($output_flag)) {
            $output_flag = RRDTOOL_OUTPUT_STDOUT;
      }

      /* WIN32: before sending this command off to rrdtool, get rid
      of all of the '\' characters. Unix does not care; win32 does.
      Also make sure to replace all of the fancy \'s at the end of the line,
      but make sure not to get rid of the "\n"'s that are supposed to be
      in there (text format) */
      $command_line = str_replace("\\\n", " ", $command_line);

      /* output information to the log file if appropriate */
      if (read_config_option("log_verbosity") >= POLLER_VERBOSITY_DEBUG) {
            cacti_log("CACTI2RRD: " . read_config_option("path_rrdtool") . " $command_line", $log_to_stdout, $logopt);
      }

      /* if we want to see the error output from rrdtool; make sure to specify this */
      if (($output_flag == RRDTOOL_OUTPUT_STDERR) && (sizeof($rrd_struc) == 0)) {
            $command_line .= " 2>&1";
      }

      /* use popen to eliminate the zombie issue */
      if ($config["cacti_server_os"] == "unix") {
            /* an empty $rrd_struc array means no fp is available */
            if (sizeof($rrd_struc) == 0) {
                  $fp = popen(read_config_option("path_rrdtool") . escape_command(" $command_line"), "r");
            }else{
                  fwrite(rrd_get_fd($rrd_struc, RRDTOOL_PIPE_CHILD_READ), escape_command(" $command_line") . "\r\n");
                  fflush(rrd_get_fd($rrd_struc, RRDTOOL_PIPE_CHILD_READ));
            }
      }elseif ($config["cacti_server_os"] == "win32") {
            /* an empty $rrd_struc array means no fp is available */
            if (sizeof($rrd_struc) == 0) {
                  $fp = popen(read_config_option("path_rrdtool") . escape_command(" $command_line"), "rb");
            }else{
                  fwrite(rrd_get_fd($rrd_struc, RRDTOOL_PIPE_CHILD_READ), escape_command(" $command_line") . "\r\n");
                  fflush(rrd_get_fd($rrd_struc, RRDTOOL_PIPE_CHILD_READ));
            }
      }

      switch ($output_flag) {
            case RRDTOOL_OUTPUT_NULL:
                  return; break;
            case RRDTOOL_OUTPUT_STDOUT:
                  if (isset($fp)) {
                        $line = "";
                        while (!feof($fp)) {
                              $line .= fgets($fp, 4096);
                        }

                        return $line;
                  }

                  break;
            case RRDTOOL_OUTPUT_STDERR:
                  if (isset($fp)) {
                        $output = fgets($fp, 1000000);

                        if (substr($output, 1, 3) == "PNG") {
                              return "OK";
                        }

                        if (substr($output, 0, 5) == "GIF87") {
                              return "OK";
                        }

                        print $output;
                  }

                  break;
            case RRDTOOL_OUTPUT_GRAPH_DATA:
                  if (isset($fp)) {
                        return fpassthru($fp);
                  }

                  break;
      }
}

function rrdtool_function_create($local_data_id, $show_source, $rrd_struc) {
      global $config;

      include ($config["include_path"] . "/config_arrays.php");

      $data_source_path = get_data_source_path($local_data_id, true);

      /* ok, if that passes lets check to make sure an rra does not already
      exist, the last thing we want to do is overright data! */
      if ($show_source != true) {
            if (file_exists($data_source_path) == true) {
                  return -1;
            }
      }

      /* the first thing we must do is make sure there is at least one
      rra associated with this data source... *
      UPDATE: As of version 0.6.6, we are splitting this up into two
      SQL strings because of the multiple DS per RRD support. This is
      not a big deal however since this function gets called once per
      data source */

      $rras = db_fetch_assoc("select
            data_template_data.rrd_step,
            rra.x_files_factor,
            rra.steps,
            rra.rows,
            rra_cf.consolidation_function_id,
            (rra.rows*rra.steps) as rra_order
            from data_template_data
            left join data_template_data_rra on (data_template_data.id=data_template_data_rra.data_template_data_id)
            left join rra on (data_template_data_rra.rra_id=rra.id)
            left join rra_cf on (rra.id=rra_cf.rra_id)
            where data_template_data.local_data_id=$local_data_id
            and (rra.steps is not null or rra.rows is not null)
            order by rra_cf.consolidation_function_id,rra_order");

      /* if we find that this DS has no RRA associated; get out */
      if (sizeof($rras) <= 0) {
            cacti_log("ERROR: There are no RRA's assigned to local_data_id: $local_data_id.");
            return false;
      }

      /* create the "--step" line */
      $create_ds = RRD_NL . "--step ". $rras[0]["rrd_step"] . " " . RRD_NL;

      /* query the data sources to be used in this .rrd file */
      $data_sources = db_fetch_assoc("select
            data_template_rrd.id,
            data_template_rrd.rrd_heartbeat,
            data_template_rrd.rrd_minimum,
            data_template_rrd.rrd_maximum,
            data_template_rrd.data_source_type_id
            from data_template_rrd
            where data_template_rrd.local_data_id=$local_data_id");

      /* ONLY make a new DS entry if:
      - There is multiple data sources and this item is not the main one.
      - There is only one data source (then use it) */

      if (sizeof($data_sources) > 0) {
      foreach ($data_sources as $data_source) {
            /* use the cacti ds name by default or the user defined one, if entered */
            $data_source_name = get_data_source_item_name($data_source["id"]);

            $create_ds .= "DS:$data_source_name:" . $data_source_types{$data_source["data_source_type_id"]} . ":" . $data_source["rrd_heartbeat"] . ":" . $data_source["rrd_minimum"] . ":" . (empty($data_source["rrd_maximum"]) ? "U" : $data_source["rrd_maximum"]) . RRD_NL;
      }
      }

      $create_rra = "";
      /* loop through each available RRA for this DS */
      foreach ($rras as $rra) {
            $create_rra .= "RRA:" . $consolidation_functions{$rra["consolidation_function_id"]} . ":" . $rra["x_files_factor"] . ":" . $rra["steps"] . ":" . $rra["rows"] . RRD_NL;
      }

      if ($show_source == true) {
            return read_config_option("path_rrdtool") . " create" . RRD_NL . "$data_source_path$create_ds$create_rra";
      }else{
            rrdtool_execute("create $data_source_path $create_ds$create_rra", true, RRDTOOL_OUTPUT_STDOUT, $rrd_struc, "POLLER");
      }
}

function rrdtool_function_update($update_cache_array, $rrd_struc) {
      /* lets count the number of rrd files processed */
      $rrds_processed = 0;

      while (list($rrd_path, $rrd_fields) = each($update_cache_array)) {
            $create_rrd_file = false;

            /* create the rrd if one does not already exist */
            if (!file_exists($rrd_path)) {
                  rrdtool_function_create($rrd_fields["local_data_id"], false, $rrd_struc);

                  $create_rrd_file = true;
            }

            if ((is_array($rrd_fields["times"])) && (sizeof($rrd_fields["times"]) > 0)) {
                  ksort($rrd_fields["times"]);

                  while (list($update_time, $field_array) = each($rrd_fields["times"])) {
                        if (empty($update_time)) {
                              /* default the rrdupdate time to now */
                              $current_rrd_update_time = "N";
                        }else if ($create_rrd_file == true) {
                              /* for some reason rrdtool will not let you update using times less than the
                              rrd create time */
                              $current_rrd_update_time = "N";
                        }else{
                              $current_rrd_update_time = $update_time;
                        }

                        $i = 0; $rrd_update_template = ""; $rrd_update_values = $current_rrd_update_time . ":";
                        while (list($field_name, $value) = each($field_array)) {
                              $rrd_update_template .= $field_name;

                              /* if we have "invalid data", give rrdtool an Unknown (U) */
                              if ((!isset($value)) || (!is_numeric($value))) {
                                    $value = "U";
                              }

                              $rrd_update_values .= $value;

                              if (($i+1) < count($field_array)) {
                                    $rrd_update_template .= ":";
                                    $rrd_update_values .= ":";
                              }

                              $i++;
                        }

                        rrdtool_execute("update $rrd_path --template $rrd_update_template $rrd_update_values", true, RRDTOOL_OUTPUT_STDOUT, $rrd_struc, "POLLER");
                        $rrds_processed++;
                  }
            }
      }

      return $rrds_processed;
}

function rrdtool_function_tune($rrd_tune_array) {
      global $config;

      include($config["include_path"] . "/config_arrays.php");

      $data_source_name = get_data_source_item_name($rrd_tune_array["data_source_id"]);
      $data_source_type = $data_source_types{$rrd_tune_array["data-source-type"]};
      $data_source_path = get_data_source_path($rrd_tune_array["data_source_id"], true);

      if ($rrd_tune_array["heartbeat"] != "") {
            $rrd_tune .= " --heartbeat $data_source_name:" . $rrd_tune_array["heartbeat"];
      }

      if ($rrd_tune_array["minimum"] != "") {
            $rrd_tune .= " --minimum $data_source_name:" . $rrd_tune_array["minimum"];
      }

      if ($rrd_tune_array["maximum"] != "") {
            $rrd_tune .= " --maximum $data_source_name:" . $rrd_tune_array["maximum"];
      }

      if ($rrd_tune_array["data-source-type"] != "") {
            $rrd_tune .= " --data-source-type $data_source_name:" . $data_source_type;
      }

      if ($rrd_tune_array["data-source-rename"] != "") {
            $rrd_tune .= " --data-source-rename $data_source_name:" . $rrd_tune_array["data-source-rename"];
      }

      if ($rrd_tune != "") {
            if (file_exists($data_source_path) == true) {
                  $fp = popen(read_config_option("path_rrdtool") . " tune $data_source_path $rrd_tune", "r");
                  pclose($fp);

                  if (read_config_option("log_verbosity") >= POLLER_VERBOSITY_DEBUG) {
                        cacti_log("CACTI2RRD: " . read_config_option("path_rrdtool") . " tune $data_source_path $rrd_tune");
                  }
            }
      }
}

$rrd_fetch_cache = array();

/* rrdtool_function_fetch - given a data source, return all of its data in an array
   @arg $local_data_id - the data source to fetch data for
   @arg $start_time - the start time to use for the data calculation. this value can
     either be absolute (unix timestamp) or relative (to now)
   @arg $end_time - the end time to use for the data calculation. this value can
     either be absolute (unix timestamp) or relative (to now)
   @arg $resolution - the accuracy of the data measured in seconds
   @returns - (array) an array containing all data in this data source broken down
     by each data source item. the maximum of all data source items is included in
     an item called 'ninety_fifth_percentile_maximum' */
function &rrdtool_function_fetch($local_data_id, $start_time, $end_time, $resolution = 0) {
      global $rrd_fetch_cache;

      if (empty($local_data_id)) {
            unset($var);
            return $var;
      }

      /* the cache hash is used to identify unique items in the cache */
      $current_hash_cache = md5($local_data_id . $start_time . $end_time . $resolution);

      /* return the cached entry if available */
      if (isset($rrd_fetch_cache[$current_hash_cache])) {
            return $rrd_fetch_cache[$current_hash_cache];
      }

      $regexps = array();
      $fetch_array = array();

      $data_source_path = get_data_source_path($local_data_id, true);

      /* build and run the rrdtool fetch command with all of our data */
      $cmd_line = "fetch $data_source_path AVERAGE -s $start_time -e $end_time";
      if ($resolution > 0) {
            $cmd_line .= " -r $resolution";
      }
      $output = rrdtool_execute($cmd_line, false, RRDTOOL_OUTPUT_STDOUT);

      /* grab the first line of the output which contains a list of data sources
      in this .rrd file */
      $line_one = substr($output, 0, strpos($output, "\n"));

      /* loop through each data source in this .rrd file ... */
      if (preg_match_all("/\S+/", $line_one, $data_source_names)) {
            /* version 1.0.49 changed the output slightly */
            if (preg_match("/^timestamp/", $line_one)) {
                  array_shift($data_source_names[0]);
            }

            $fetch_array["data_source_names"] = $data_source_names[0];

            /* build a unique regexp to match each data source individually when
            passed to preg_match_all() */
            for ($i=0;$i<count($fetch_array["data_source_names"]);$i++) {
                  $regexps[$i] = '/[0-9]+:\s+';

                  for ($j=0;$j<count($fetch_array["data_source_names"]);$j++) {
                        /* it seems that at least some versions of the Windows RRDTool binary pads
                        the exponent to 3 digits, rather than 2 on every Unix version that I have
                        ever seen */
                        if ($j == $i) {
                              $regexps[$i] .= '([\-]?[0-9]{1}\.[0-9]+)e([\+-][0-9]{2,3})';
                        }else{
                              $regexps[$i] .= '[\-]?[0-9]{1}\.[0-9]+e[\+-][0-9]{2,3}';
                        }

                        if ($j < count($fetch_array["data_source_names"])) {
                              $regexps[$i] .= '\s+';
                        }
                  }

                  $regexps[$i] .= '/';
            }
      }

      $max_array = array();

      /* loop through each regexp determined above (or each data source) */
      for ($i=0;$i<count($regexps);$i++) {
            $fetch_array["values"][$i] = array();

            /* match the regexp against the rrdtool fetch output to get a mantisa and
            exponent for each line */
            if (preg_match_all($regexps[$i], $output, $matches)) {
                  for ($j=0; ($j < count($matches[1])); $j++) {
                        $line = ($matches[1][$j] * (pow(10,(float)$matches[2][$j])));
                        array_push($fetch_array["values"][$i], ($line * 1));

                        $max_array[$j][$i] = $line;
                  }
            }
      }

      if (isset($fetch_array["data_source_names"])) {
            $next_index = count($fetch_array["data_source_names"]);

            $fetch_array["data_source_names"][$next_index] = "nth_percentile_maximum";

            /* calculate the max for each row */
            for ($i=0; $i<count($max_array); $i++) {
                  $fetch_array["values"][$next_index][$i] = max($max_array[$i]);
            }
      }

      /* clear the cache if it gets too big */
      if (sizeof($rrd_fetch_cache) >= MAX_FETCH_CACHE_SIZE) {
            $rrd_fetch_cache = array();
      }

      /* update the cache */
      if (MAX_FETCH_CACHE_SIZE > 0) {
            $rrd_fetch_cache[$current_hash_cache] = $fetch_array;
      }

      return $fetch_array;
}

function rrdtool_function_graph($local_graph_id, $rra_id, $graph_data_array, $rrd_struc = array()) {
      global $config;

      include_once($config["library_path"] . "/cdef.php");
      include_once($config["library_path"] . "/graph_variables.php");
      include($config["include_path"] . "/config_arrays.php");

      /* set the rrdtool default font */
      if (read_config_option("path_rrdtool_default_font")) {
            putenv("RRD_DEFAULT_FONT=" . read_config_option("path_rrdtool_default_font"));
      }

      /* before we do anything; make sure the user has permission to view this graph,
      if not then get out */
      if ((read_config_option("global_auth") == "on") && (isset($_SESSION["sess_user_id"]))) {
            $access_denied = !(is_graph_allowed($local_graph_id));

            if ($access_denied == true) {
                  return "GRAPH ACCESS DENIED";
            }
      }

      /* find the step and how often this graph is updated with new data */
      $ds_step = db_fetch_cell("select
            data_template_data.rrd_step
            from (data_template_data,data_template_rrd,graph_templates_item)
            where graph_templates_item.task_item_id=data_template_rrd.id
            and data_template_rrd.local_data_id=data_template_data.local_data_id
            and graph_templates_item.local_graph_id=$local_graph_id
            limit 0,1");
      $ds_step = empty($ds_step) ? 300 : $ds_step;

      /* if no rra was specified, we need to figure out which one RRDTool will choose using
       * "best-fit" resolution fit algorithm */
      if (empty($rra_id)) {
            if ((empty($graph_data_array["graph_start"])) || (empty($graph_data_array["graph_end"]))) {
                  $rra["rows"] = 600;
                  $rra["steps"] = 1;
                  $rra["timespan"] = 86400;
            }else{
                  /* get a list of RRAs related to this graph */
                  $rras = get_associated_rras($local_graph_id);

                  if (sizeof($rras) > 0) {
                        foreach ($rras as $unchosen_rra) {
                              /* the timespan specified in the RRA "timespan" field may not be accurate */
                              $real_timespan = ($ds_step * $unchosen_rra["steps"] * $unchosen_rra["rows"]);

                              /* make sure the current start/end times fit within each RRA's timespan */
                              if ( (($graph_data_array["graph_end"] - $graph_data_array["graph_start"]) <= $real_timespan) && ((time() - $graph_data_array["graph_start"]) <= $real_timespan) ) {
                                    /* is this RRA better than the already chosen one? */
                                    if ((isset($rra)) && ($unchosen_rra["steps"] < $rra["steps"])) {
                                          $rra = $unchosen_rra;
                                    }else if (!isset($rra)) {
                                          $rra = $unchosen_rra;
                                    }
                              }
                        }
                  }

                  if (!isset($rra)) {
                        $rra["rows"] = 600;
                        $rra["steps"] = 1;
                  }
            }
      }else{
            $rra = db_fetch_row("select timespan,rows,steps from rra where id=$rra_id");
      }

      $seconds_between_graph_updates = ($ds_step * $rra["steps"]);

      $graph = db_fetch_row("select
            graph_local.host_id,
            graph_local.snmp_query_id,
            graph_local.snmp_index,
            graph_templates_graph.title_cache,
            graph_templates_graph.vertical_label,
            graph_templates_graph.auto_scale,
            graph_templates_graph.auto_scale_opts,
            graph_templates_graph.auto_scale_log,
            graph_templates_graph.auto_scale_rigid,
            graph_templates_graph.auto_padding,
            graph_templates_graph.base_value,
            graph_templates_graph.upper_limit,
            graph_templates_graph.lower_limit,
            graph_templates_graph.height,
            graph_templates_graph.width,
            graph_templates_graph.image_format_id,
            graph_templates_graph.unit_value,
            graph_templates_graph.unit_exponent_value,
            graph_templates_graph.export
            from (graph_templates_graph,graph_local)
            where graph_local.id=graph_templates_graph.local_graph_id
            and graph_templates_graph.local_graph_id=$local_graph_id");

      /* lets make that sql query... */
      $graph_items = db_fetch_assoc("select
            graph_templates_item.id as graph_templates_item_id,
            graph_templates_item.cdef_id,
            graph_templates_item.text_format,
            graph_templates_item.value,
            graph_templates_item.hard_return,
            graph_templates_item.consolidation_function_id,
            graph_templates_item.graph_type_id,
            graph_templates_gprint.gprint_text,
            colors.hex,
            data_template_rrd.id as data_template_rrd_id,
            data_template_rrd.local_data_id,
            data_template_rrd.rrd_minimum,
            data_template_rrd.rrd_maximum,
            data_template_rrd.data_source_name,
            data_template_rrd.local_data_template_rrd_id
            from graph_templates_item
            left join data_template_rrd on (graph_templates_item.task_item_id=data_template_rrd.id)
            left join colors on (graph_templates_item.color_id=colors.id)
            left join graph_templates_gprint on (graph_templates_item.gprint_id=graph_templates_gprint.id)
            where graph_templates_item.local_graph_id=$local_graph_id
            order by graph_templates_item.sequence");

      /* +++++++++++++++++++++++ GRAPH OPTIONS +++++++++++++++++++++++ */

      /* define some variables */
      $scale = "";
      $rigid = "";
      $unit_exponent_value = "";
      $graph_legend = "";
      $graph_defs = "";
      $txt_graph_items = "";
      $text_padding = "";
      $greatest_text_format = 0;
      $last_graph_type = "";

      if ($graph["auto_scale"] == "on") {
            if ($graph["auto_scale_opts"] == "1") {
                  $scale = "--alt-autoscale" . RRD_NL;
            }elseif ($graph["auto_scale_opts"] == "2") {
                  $scale = "--alt-autoscale-max" . RRD_NL;
                  $scale .= "--lower-limit=" . $graph["lower_limit"] . RRD_NL;
            }

            if ($graph["auto_scale_log"] == "on") {
                  $scale .= "--logarithmic" . RRD_NL;
            }
      }else{
            $scale =  "--upper-limit=" . $graph["upper_limit"] . RRD_NL;
            $scale .= "--lower-limit=" . $graph["lower_limit"] . RRD_NL;
      }

      if ($graph["auto_scale_rigid"] == "on") {
            $rigid = "--rigid" . RRD_NL;
      }

      if (!empty($graph["unit_value"])) {
            $unit_value = "--unit=" . $graph["unit_value"] . RRD_NL;
      }

      if (ereg("^[0-9]+$", $graph["unit_exponent_value"])) {
            $unit_exponent_value = "--units-exponent=" . $graph["unit_exponent_value"] . RRD_NL;
      }

      /*
       * optionally you can specify and array that overrides some of the db's values, lets set
       * that all up here
       */

      /* override: graph start time */
      if ((!isset($graph_data_array["graph_start"])) || ($graph_data_array["graph_start"] == "0")) {
            $graph_start = -($rra["timespan"]);
      }else{
            $graph_start = $graph_data_array["graph_start"];
      }

      /* override: graph end time */
      if ((!isset($graph_data_array["graph_end"])) || ($graph_data_array["graph_end"] == "0")) {
            $graph_end = -($seconds_between_graph_updates);
      }else{
            $graph_end = $graph_data_array["graph_end"];
      }

      /* override: graph height (in pixels) */
      if (isset($graph_data_array["graph_height"])) {
            $graph_height = $graph_data_array["graph_height"];
      }else{
            $graph_height = $graph["height"];
      }

      /* override: graph width (in pixels) */
      if (isset($graph_data_array["graph_width"])) {
            $graph_width = $graph_data_array["graph_width"];
      }else{
            $graph_width = $graph["width"];
      }

      /* override: skip drawing the legend? */
      if (isset($graph_data_array["graph_nolegend"])) {
            $graph_legend = "--no-legend" . RRD_NL;
      }else{
            $graph_legend = "";
      }

      /* export options */
      if (isset($graph_data_array["export"])) {
            $graph_opts = read_config_option("path_html_export") . "/" . $graph_data_array["export_filename"] . RRD_NL;
      }else{
            if (empty($graph_data_array["output_filename"])) {
                        $graph_opts = "-" . RRD_NL;
            }else{
                  $graph_opts = $graph_data_array["output_filename"] . RRD_NL;
            }
      }

      /* setup date format */
      $date_fmt = read_graph_config_option("default_date_format");
      $datechar = read_graph_config_option("default_datechar");

      if ($datechar == GDC_HYPHEN) {
            $datechar = "-";
      }else {
            $datechar = "/";
      }

      switch ($date_fmt) {
            case GD_MO_D_Y:
                  $graph_date = "m" . $datechar . "d" . $datechar . "Y H:i:s";
                  break;
            case GD_MN_D_Y:
                  $graph_date = "M" . $datechar . "d" . $datechar . "Y H:i:s";
                  break;
            case GD_D_MO_Y:
                  $graph_date = "d" . $datechar . "m" . $datechar . "Y H:i:s";
                  break;
            case GD_D_MN_Y:
                  $graph_date = "d" . $datechar . "M" . $datechar . "Y H:i:s";
                  break;
            case GD_Y_MO_D:
                  $graph_date = "Y" . $datechar . "m" . $datechar . "d H:i:s";
                  break;
            case GD_Y_MN_D:
                  $graph_date = "Y" . $datechar . "M" . $datechar . "d H:i:s";
                  break;
      }

      /* display the timespan for zoomed graphs */
      if ((isset($graph_data_array["graph_start"])) && (isset($graph_data_array["graph_end"]))) {
            if (($graph_data_array["graph_start"] < 0) && ($graph_data_array["graph_end"] < 0)) {
                  if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
                        $graph_legend .= "COMMENT:\"From " . str_replace(":", "\:", date($graph_date, time()+$graph_data_array["graph_start"])) . " To " . str_replace(":", "\:", date($graph_date, time()+$graph_data_array["graph_end"])) . "\\c\"" . RRD_NL . "COMMENT:\"  \\n\"" . RRD_NL;
                  }else {
                        $graph_legend .= "COMMENT:\"From " . date($graph_date, time()+$graph_data_array["graph_start"]) . " To " . date($graph_date, time()+$graph_data_array["graph_end"]) . "\\c\"" . RRD_NL . "COMMENT:\"  \\n\"" . RRD_NL;
                  }
            }else if (($graph_data_array["graph_start"] >= 0) && ($graph_data_array["graph_end"] >= 0)) {
                  if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
                        $graph_legend .= "COMMENT:\"From " . str_replace(":", "\:", date($graph_date, $graph_data_array["graph_start"])) . " To " . str_replace(":", "\:", date($graph_date, $graph_data_array["graph_end"])) . "\\c\"" . RRD_NL . "COMMENT:\"  \\n\"" . RRD_NL;
                  }else {
                        $graph_legend .= "COMMENT:\"From " . date($graph_date, $graph_data_array["graph_start"]) . " To " . date($graph_date, $graph_data_array["graph_end"]) . "\\c\"" . RRD_NL . "COMMENT:\"  \\n\"" . RRD_NL;
                  }
            }
      }

      /* basic graph options */
      $graph_opts .=
            "--imgformat=" . $image_types{$graph["image_format_id"]} . RRD_NL .
            "--start=$graph_start" . RRD_NL .
            "--end=$graph_end" . RRD_NL .
            "--title=\"" . str_replace("\"", "\\\"", $graph["title_cache"]) . "\"" . RRD_NL .
            "$rigid" .
            "--base=" . $graph["base_value"] . RRD_NL .
            "--height=$graph_height" . RRD_NL .
            "--width=$graph_width" . RRD_NL .
            "$scale" .
            "$unit_exponent_value" .
            "$graph_legend" .
            "--vertical-label=\"" . $graph["vertical_label"] . "\"" . RRD_NL;

      /* rrdtool 1.2.x does not provide smooth lines, let's force it */
      if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
            $graph_opts .= "--slope-mode" . RRD_NL;
      }

      /* rrdtool 1.2 font options */
      if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
            /* title fonts */
            if (file_exists(read_graph_config_option("title_font"))) {
                  $graph_opts .= "--font TITLE:" . read_graph_config_option("title_size") . ":" . read_graph_config_option("title_font") . RRD_NL;
            }elseif (file_exists(read_config_option("title_font"))) {
                  $graph_opts .= "--font TITLE:" . read_config_option("title_size") . ":" . read_config_option("title_font") . RRD_NL;
            }

            /* axis fonts */
            if (file_exists(read_graph_config_option("axis_font"))) {
                  $graph_opts .= "--font AXIS:" . read_graph_config_option("axis_size") . ":" . read_graph_config_option("axis_font") . RRD_NL;
            }elseif (file_exists(read_config_option("axis_font"))) {
                  $graph_opts .= "--font AXIS:" . read_config_option("axis_size") . ":" . read_config_option("axis_font") . RRD_NL;
            }

            /* legend fonts */
            if (file_exists(read_graph_config_option("legend_font"))) {
                  $graph_opts .= "--font LEGEND:" . read_graph_config_option("legend_size") . ":" . read_graph_config_option("legend_font") . RRD_NL;
            }elseif (file_exists(read_config_option("legend_font"))) {
                  $graph_opts .= "--font LEGEND:" . read_config_option("legend_size") . ":" . read_config_option("legend_font") . RRD_NL;
            }

            /* unit fonts */
            if (file_exists(read_graph_config_option("unit_font"))) {
                  $graph_opts .= "--font UNIT:" . read_graph_config_option("unit_size") . ":" . read_graph_config_option("unit_font") . RRD_NL;
            }elseif (file_exists(read_config_option("unit_font"))) {
                  $graph_opts .= "--font UNIT:" . read_config_option("unit_size") . ":" . read_config_option("unit_font") . RRD_NL;
            }
      }

      $i = 0; $j = 0;
      if (sizeof($graph_items > 0)) {

            foreach ($graph_items as $graph_item) {
                  if ((ereg("(AREA|STACK|LINE[123])", $graph_item_types{$graph_item["graph_type_id"]})) && ($graph_item["data_source_name"] != "")) {
                        /* use a user-specified ds path if one is entered */
                        $data_source_path = get_data_source_path($graph_item["local_data_id"], true);

                        /* FOR WIN32: Escape all colon for drive letters (ex. D\:/path/to/rra) */
                        $data_source_path = str_replace(":", "\:", $data_source_path);

                        if (!empty($data_source_path)) {
                              /* NOTE: (Update) Data source DEF names are created using the graph_item_id; then passed
                              to a function that matches the digits with letters. rrdtool likes letters instead
                              of numbers in DEF names; especially with CDEF's. cdef's are created
                              the same way, except a 'cdef' is put on the beginning of the hash */
                              $graph_defs .= "DEF:" . generate_graph_def_name(strval($i)) . "=\"$data_source_path\":" . $graph_item["data_source_name"] . ":" . $consolidation_functions{$graph_item["consolidation_function_id"]} . RRD_NL;

                              //print "ds: " . $graph_item["data_template_rrd_id"] . "<br>";
                              $cf_ds_cache{$graph_item["data_template_rrd_id"]}{$graph_item["consolidation_function_id"]} = "$i";

                              $i++;
                        }
                  }

                  /* cache cdef value here to support data query variables in the cdef string */
                  if (empty($graph_item["cdef_id"])) {
                        $graph_item["cdef_cache"] = "";
                        $graph_items[$j]["cdef_cache"] = "";
                  }else{
                        $graph_item["cdef_cache"] = get_cdef($graph_item["cdef_id"]);
                        $graph_items[$j]["cdef_cache"] = get_cdef($graph_item["cdef_id"]);
                  }

                  /* +++++++++++++++++++++++ LEGEND: TEXT SUBSITUTION (<>'s) +++++++++++++++++++++++ */

                  /* note the current item_id for easy access */
                  $graph_item_id = $graph_item["graph_templates_item_id"];

                  /* the following fields will be searched for graph variables */
                  $variable_fields = array(
                        "text_format" => array(
                              "process_no_legend" => false
                              ),
                        "value" => array(
                              "process_no_legend" => true
                              ),
                        "cdef_cache" => array(
                              "process_no_legend" => true
                              )
                        );

                  /* loop through each field that we want to substitute values for:
                  currently: text format and value */
                  while (list($field_name, $field_array) = each($variable_fields)) {
                        /* certain fields do not require values when the legend is not to be shown */
                        if (($field_array["process_no_legend"] == false) && (isset($graph_data_array["graph_nolegend"]))) {
                              continue;
                        }

                        $graph_variables[$field_name][$graph_item_id] = $graph_item[$field_name];

                        /* date/time substitution */
                        if (strstr($graph_variables[$field_name][$graph_item_id], "|date_time|")) {
                              $graph_variables[$field_name][$graph_item_id] = str_replace("|date_time|", date('D d M H:i:s T Y', strtotime(db_fetch_cell("select value from settings where name='date'"))), $graph_variables[$field_name][$graph_item_id]);
                        }

                        /* data query variables */
                        if (preg_match("/\|query_[a-zA-Z0-9_]+\|/", $graph_variables[$field_name][$graph_item_id])) {
                              /* default to the graph data query information from the graph */
                              if (empty($graph_item["local_data_id"])) {
                                    $graph_variables[$field_name][$graph_item_id] = substitute_snmp_query_data($graph_variables[$field_name][$graph_item_id], $graph["host_id"], $graph["snmp_query_id"], $graph["snmp_index"]);
                              /* use the data query information from the data source if possible */
                              }else{
                                    $data_local = db_fetch_row("select snmp_index,snmp_query_id,host_id from data_local where id='" . $graph_item["local_data_id"] . "'");
                                    $graph_variables[$field_name][$graph_item_id] = substitute_snmp_query_data($graph_variables[$field_name][$graph_item_id], $data_local["host_id"], $data_local["snmp_query_id"], $data_local["snmp_index"]);
                              }
                        }

                        /* Nth percentile */
                        if (preg_match_all("/\|([0-9]{1,2}):(bits|bytes):(\d):(current|total|max|total_peak|all_max_current|all_max_peak|aggregate_max|aggregate_sum|aggregate)(:(\d))?\|/", $graph_variables[$field_name][$graph_item_id], $matches, PREG_SET_ORDER)) {
                              foreach ($matches as $match) {
                                    $graph_variables[$field_name][$graph_item_id] = str_replace($match[0], variable_nth_percentile($match, $graph_item, $graph_items, $graph_start, $graph_end), $graph_variables[$field_name][$graph_item_id]);
                              }
                        }

                        /* bandwidth summation */
                        if (preg_match_all("/\|sum:(\d|auto):(current|total|atomic):(\d):(\d+|auto)\|/", $graph_variables[$field_name][$graph_item_id], $matches, PREG_SET_ORDER)) {
                              foreach ($matches as $match) {
                                    $graph_variables[$field_name][$graph_item_id] = str_replace($match[0], variable_bandwidth_summation($match, $graph_item, $graph_items, $graph_start, $graph_end, $rra["steps"], $ds_step), $graph_variables[$field_name][$graph_item_id]);
                              }
                        }
                  }

                  /* if we are not displaying a legend there is no point in us even processing the auto padding,
                  text format stuff. */
                  if (!isset($graph_data_array["graph_nolegend"])) {
                        /* set hard return variable if selected (\n) */
                        if ($graph_item["hard_return"] == "on") {
                              $hardreturn[$graph_item_id] = "\\n";
                        }else{
                              $hardreturn[$graph_item_id] = "";
                        }

                        /* +++++++++++++++++++++++ LEGEND: AUTO PADDING (<>'s) +++++++++++++++++++++++ */

                        /* PADDING: remember this is not perfect! its main use is for the basic graph setup of:
                        AREA - GPRINT-CURRENT - GPRINT-AVERAGE - GPRINT-MAXIMUM \n
                        of course it can be used in other situations, however may not work as intended.
                        If you have any additions to this small peice of code, feel free to send them to me. */
                        if ($graph["auto_padding"] == "on") {
                              /* only applies to AREA and STACK */
                              if (ereg("(AREA|STACK|LINE[123])", $graph_item_types{$graph_item["graph_type_id"]})) {
                                    $text_format_lengths{$graph_item["data_template_rrd_id"]} = strlen($graph_variables["text_format"][$graph_item_id]);

                                    if ((strlen($graph_variables["text_format"][$graph_item_id]) > $greatest_text_format) && ($graph_item_types{$graph_item["graph_type_id"]} != "COMMENT")) {
                                          $greatest_text_format = strlen($graph_variables["text_format"][$graph_item_id]);
                                    }
                              }
                        }
                  }

                  $j++;
            }
      }

      /* +++++++++++++++++++++++ GRAPH ITEMS: CDEF's +++++++++++++++++++++++ */

      $i = 0;
      reset($graph_items);

      /* hack for rrdtool 1.2.x support */
      $graph_item_stack_type = "";

      if (sizeof($graph_items) > 0) {
      foreach ($graph_items as $graph_item) {
            /* first we need to check if there is a DEF for the current data source/cf combination. if so,
            we will use that */
            if (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}{$graph_item["consolidation_function_id"]})) {
                  $cf_id = $graph_item["consolidation_function_id"];
            }else{
            /* if there is not a DEF defined for the current data source/cf combination, then we will have to
            improvise. choose the first available cf in the following order: AVERAGE, MAX, MIN, LAST */
                  if (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[1])) {
                        $cf_id = 1; /* CF: AVERAGE */
                  }elseif (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[3])) {
                        $cf_id = 3; /* CF: MAX */
                  }elseif (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[2])) {
                        $cf_id = 2; /* CF: MIN */
                  }elseif (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[4])) {
                        $cf_id = 4; /* CF: LAST */
                  }else{
                        $cf_id = 1; /* CF: AVERAGE */
                  }
            }

            /* make cdef string here; a note about CDEF's in cacti. A CDEF is neither unique to a
            data source of global cdef, but is unique when those two variables combine. */
            $cdef_graph_defs = ""; $cdef_total_ds = ""; $cdef_similar_ds = "";

            if ((!empty($graph_item["cdef_id"])) && (!isset($cdef_cache{$graph_item["cdef_id"]}{$graph_item["data_template_rrd_id"]}[$cf_id]))) {
                  $cdef_string = $graph_variables["cdef_cache"]{$graph_item["graph_templates_item_id"]};

                  /* create cdef string for "total all data sources" if requested */
                  if (ereg("ALL_DATA_SOURCES_(NO)?DUPS", $cdef_string)) {
                        $item_count = 0;
                        for ($t=0;($t<count($graph_items));$t++) {
                              if ((ereg("(AREA|STACK|LINE[123])", $graph_item_types{$graph_items[$t]["graph_type_id"]})) && (!empty($graph_items[$t]["data_template_rrd_id"]))) {
                                    /* if the user screws up CF settings, PHP will generate warnings if left unchecked */
                                    if (isset($cf_ds_cache{$graph_items[$t]["data_template_rrd_id"]}[$cf_id])) {
                                          $def_name = generate_graph_def_name(strval($cf_ds_cache{$graph_items[$t]["data_template_rrd_id"]}[$cf_id]));
                                          $cdef_total_ds .= ($item_count == 0 ? "" : ",") . "TIME," . (time() - $seconds_between_graph_updates) . ",GT,$def_name,$def_name,UN,0,$def_name,IF,IF"; /* convert unknowns to '0' first */
                                          $item_count++;
                                    }
                              }
                        }

                        /* if there is only one item to total, don't even bother with the summation. otherwise
                        cdef=a,b,c,+,+ is fine. */
                        if ($item_count > 1) {
                              $cdef_total_ds .= str_repeat(",+", ($item_count - 2)) . ",+";
                        }
                  }

                  /* create cdef string for "total similar data sources" if requested */
                  if (ereg("SIMILAR_DATA_SOURCES_(NO)?DUPS", $cdef_string) ) {
                        $sources_seen = array();
                        $item_count = 0;

                        for ($t=0;($t<count($graph_items));$t++) {
                              if ((ereg("(AREA|STACK|LINE[123])", $graph_item_types{$graph_items[$t]["graph_type_id"]})) && (!empty($graph_items[$t]["data_template_rrd_id"])) && ($graph_item["data_source_name"] == $graph_items[$t]["data_source_name"]) && ($graph_item["graph_templates_item_id"] != $graph_items[$t]["graph_templates_item_id"])) {
                                    /* if the user screws up CF settings, PHP will generate warnings if left unchecked */
                                    if (isset($cf_ds_cache{$graph_items[$t]["data_template_rrd_id"]}[$cf_id]) && (!isset($sources_seen{$graph_items[$t]["data_template_rrd_id"]}))) {
                                          $def_name = generate_graph_def_name(strval($cf_ds_cache{$graph_items[$t]["data_template_rrd_id"]}[$cf_id]));
                                          $cdef_similar_ds .= ($item_count == 0 ? "" : ",") . "TIME," . (time() - $seconds_between_graph_updates) . ",GT,$def_name,$def_name,UN,0,$def_name,IF,IF"; /* convert unknowns to '0' first */
                                          $sources_seen{$graph_items[$t]["data_template_rrd_id"]} = 1;
                                          $item_count++;
                                    }
                              }
                        }

                        /* if there is only one item to total, don't even bother with the summation. otherwise
                        cdef=a,b,c,+,+ is fine. */
                        if ($item_count > 1) {
                              $cdef_similar_ds .= str_repeat(",+", ($item_count - 2)) . ",+";
                        }
                  }

                  $cdef_string = str_replace("CURRENT_DATA_SOURCE", generate_graph_def_name(strval((isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[$cf_id]) ? $cf_ds_cache{$graph_item["data_template_rrd_id"]}[$cf_id] : "0"))), $cdef_string);
                  $cdef_string = str_replace("ALL_DATA_SOURCES_NODUPS", $cdef_total_ds, $cdef_string);
                  $cdef_string = str_replace("SIMILAR_DATA_SOURCES_NODUPS", $cdef_similar_ds, $cdef_string);

                  /* data source item variables */
                  $cdef_string = str_replace("CURRENT_DS_MINIMUM_VALUE", (empty($graph_item["rrd_minimum"]) ? "0" : $graph_item["rrd_minimum"]), $cdef_string);
                  $cdef_string = str_replace("CURRENT_DS_MAXIMUM_VALUE", (empty($graph_item["rrd_maximum"]) ? "0" : $graph_item["rrd_maximum"]), $cdef_string);
                  $cdef_string = str_replace("CURRENT_GRAPH_MINIMUM_VALUE", (empty($graph["lower_limit"]) ? "0" : $graph["lower_limit"]), $cdef_string);
                  $cdef_string = str_replace("CURRENT_GRAPH_MAXIMUM_VALUE", (empty($graph["upper_limit"]) ? "0" : $graph["upper_limit"]), $cdef_string);

                  /* make the initial "virtual" cdef name: 'cdef' + [a,b,c,d...] */
                  $cdef_graph_defs .= "CDEF:cdef" . generate_graph_def_name(strval($i)) . "=";
                  $cdef_graph_defs .= $cdef_string;
                  $cdef_graph_defs .= " \\\n";

                  /* the CDEF cache is so we do not create duplicate CDEF's on a graph */
                  $cdef_cache{$graph_item["cdef_id"]}{$graph_item["data_template_rrd_id"]}[$cf_id] = "$i";
            }

            /* add the cdef string to the end of the def string */
            $graph_defs .= $cdef_graph_defs;

            /* note the current item_id for easy access */
            $graph_item_id = $graph_item["graph_templates_item_id"];

            /* if we are not displaying a legend there is no point in us even processing the auto padding,
            text format stuff. */
            if ((!isset($graph_data_array["graph_nolegend"])) && ($graph["auto_padding"] == "on") && (isset($text_format_lengths{$graph_item["data_template_rrd_id"]}))) {
                  /* we are basing how much to pad on area and stack text format,
                  not gprint. but of course the padding has to be displayed in gprint,
                  how fun! */

                  $pad_number = ($greatest_text_format - $text_format_lengths{$graph_item["data_template_rrd_id"]});
                  //cacti_log("MAX: $greatest_text_format, CURR: $text_format_lengths[$item_dsid], DSID: $item_dsid");
                  $text_padding = str_pad("", $pad_number);

                  /* two GPRINT's in a row screws up the padding, lets not do that */
                  if (($graph_item_types{$graph_item["graph_type_id"]} == "GPRINT") && ($last_graph_type == "GPRINT")) {
                        $text_padding = "";
                  }

                  $last_graph_type = $graph_item_types{$graph_item["graph_type_id"]};
            }

            /* we put this in a variable so it can be manipulated before mainly used
            if we want to skip it, like below */
            $current_graph_item_type = $graph_item_types{$graph_item["graph_type_id"]};

            /* IF this graph item has a data source... get a DEF name for it, or the cdef if that applies
            to this graph item */
            if ($graph_item["cdef_id"] == "0") {
                  if (isset($cf_ds_cache{$graph_item["data_template_rrd_id"]}[$cf_id])) {
                        $data_source_name = generate_graph_def_name(strval($cf_ds_cache{$graph_item["data_template_rrd_id"]}[$cf_id]));
                  }else{
                        $data_source_name = "";
                  }
            }else{
                  $data_source_name = "cdef" . generate_graph_def_name(strval($cdef_cache{$graph_item["cdef_id"]}{$graph_item["data_template_rrd_id"]}[$cf_id]));
            }

            /* to make things easier... if there is no text format set; set blank text */
            if (!isset($graph_variables["text_format"][$graph_item_id])) {
                  $graph_variables["text_format"][$graph_item_id] = "";
            }

            if (!isset($hardreturn[$graph_item_id])) {
                  $hardreturn[$graph_item_id] = "";
            }

            /* +++++++++++++++++++++++ GRAPH ITEMS +++++++++++++++++++++++ */

            /* most of the calculations have been done above. now we have for print everything out
            in an RRDTool-friendly fashion */

            $need_rrd_nl = TRUE;

            if ($graph_item_types{$graph_item["graph_type_id"]} == "COMMENT") {
                  if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
                        $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":\"" . str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]) . $hardreturn[$graph_item_id] . "\" ";
                  }else {
                        $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\" ";
                  }
            }elseif (($graph_item_types{$graph_item["graph_type_id"]} == "GPRINT") && (!isset($graph_data_array["graph_nolegend"]))) {
                  $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */
                  $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":" . $data_source_name . ":" . $consolidation_functions{$graph_item["consolidation_function_id"]} . ":\"$text_padding" . $graph_variables["text_format"][$graph_item_id] . $graph_item["gprint_text"] . $hardreturn[$graph_item_id] . "\" ";
            }elseif (ereg("^(AREA|LINE[123]|STACK|HRULE|VRULE)$", $graph_item_types{$graph_item["graph_type_id"]})) {

                  /* initialize any color syntax for graph item */
                  if (empty($graph_item["hex"])) {
                        $graph_item_color_code = "";
                  }else{
                        $graph_item_color_code = "#" . $graph_item["hex"];
                  }

                  if (ereg("^(AREA|LINE[123])$", $graph_item_types{$graph_item["graph_type_id"]})) {
                        $graph_item_stack_type = $graph_item_types{$graph_item["graph_type_id"]};
                        $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */
                        $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":" . $data_source_name . $graph_item_color_code . ":" . "\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\" ";
                  }elseif ($graph_item_types{$graph_item["graph_type_id"]} == "STACK") {
                        if (read_config_option("rrdtool_version") == "rrd-1.2.x") {
                              $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */
                              $txt_graph_items .= $graph_item_stack_type . ":" . $data_source_name . $graph_item_color_code . ":" . "\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\":STACK";
                        }else {
                              $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */
                              $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":" . $data_source_name . $graph_item_color_code . ":" . "\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\" ";
                        }
                  }elseif ($graph_item_types{$graph_item["graph_type_id"]} == "HRULE") {
                        $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */
                        $graph_variables["value"][$graph_item_id] = str_replace(":", "\:", $graph_variables["value"][$graph_item_id]); /* escape colons */
                        $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":" . $graph_variables["value"][$graph_item_id] . $graph_item_color_code . ":\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\" ";
                  }elseif ($graph_item_types{$graph_item["graph_type_id"]} == "VRULE") {
                        $graph_variables["text_format"][$graph_item_id] = str_replace(":", "\:", $graph_variables["text_format"][$graph_item_id]); /* escape colons */

                        $value_array = explode(":", $graph_item["value"]);

                        if ($value_array[0] < 0) {
                              $value = date("U") - (-3600 * $value_array[0]) - 60 * $value_array[1];
                        }else{
                              $value = date("U", mktime($value_array[0],$value_array[1],0));
                        }

                        $txt_graph_items .= $graph_item_types{$graph_item["graph_type_id"]} . ":" . $value . $graph_item_color_code . ":\"" . $graph_variables["text_format"][$graph_item_id] . $hardreturn[$graph_item_id] . "\" ";
                  }
            }else{
                  $need_rrd_nl = FALSE;
            }

            $i++;

            if (($i < sizeof($graph_items)) && ($need_rrd_nl)) {
                  $txt_graph_items .= RRD_NL;
            }
      }
      }

      /* either print out the source or pass the source onto rrdtool to get us a nice PNG */
      if (isset($graph_data_array["print_source"])) {
            print "<PRE>" . read_config_option("path_rrdtool") . " graph $graph_opts$graph_defs$txt_graph_items</PRE>";
      }else{
            if (isset($graph_data_array["export"])) {
                  rrdtool_execute("graph $graph_opts$graph_defs$txt_graph_items", false, RRDTOOL_OUTPUT_NULL, $rrd_struc);
                  return 0;
            }else{
                  if (isset($graph_data_array["output_flag"])) {
                        $output_flag = $graph_data_array["output_flag"];
                  }else{
                        $output_flag = RRDTOOL_OUTPUT_GRAPH_DATA;
                  }

                  return rrdtool_execute("graph $graph_opts$graph_defs$txt_graph_items", false, $output_flag, $rrd_struc);
            }
      }
}

?>

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