#!rsc by RouterOS
# RouterOS script: global-functions
# Copyright (c) 2013-2021 Christian Hesse <mail@eworm.de>
#                         Michael Gisbers <michael@gisbers.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# global functions
# https://git.eworm.de/cgit/routeros-scripts/about/

# expected configuration version
:global ExpectedConfigVersion 71;

# global variables not to be changed by user
:global GlobalFunctionsReady false;
:global Identity [ / system identity get name ];

# global functions
:global CertificateAvailable;
:global CertificateDownload;
:global CertificateNameByCN;
:global CharacterReplace;
:global CleanFilePath;
:global DefaultRouteIsReachable;
:global DeviceInfo;
:global DNSIsResolving;
:global DownloadPackage;
:global EitherOr;
:global EscapeForRegEx;
:global FlushEmailQueue;
:global GetMacVendor;
:global GetRandom20CharHex;
:global GetRandomNumber;
:global HexToNum;
:global IfThenElse;
:global LogPrintExit2;
:global MkDir;
:global NotificationFunctions;
:global ParseKeyValueStore;
:global QuotedPrintable;
:global RandomDelay;
:global RequiredRouterOS;
:global ScriptFromTerminal;
:global ScriptInstallUpdate;
:global ScriptLock;
:global SendEMail;
:global SendEMail2;
:global SendNotification;
:global SendNotification2;
:global SymbolByUnicodeName;
:global SymbolForNotification;
:global TimeIsSync;
:global UrlEncode;
:global ValidateSyntax;
:global VersionToNum;
:global WaitDefaultRouteReachable;
:global WaitDNSResolving;
:global WaitForFile;
:global WaitFullyConnected;
:global WaitTimeSync;

# check and download required certificate
:set CertificateAvailable do={
  :local CommonName [ :tostr $1 ];

  :global CertificateDownload;
  :global LogPrintExit2;
  :global ParseKeyValueStore;

  :if ([ / system resource get free-hdd-space ] < 8388608 && \
       [ / certificate settings get crl-download ] = true && \
       [ / certificate settings get crl-store ] = "system") do={
    $LogPrintExit2 warning $0 ("This system has low free flash space but " . \
      "is configured to download certificate CRLs to system!") false;
  }

  :if ([ :len [ / certificate find where common-name=$CommonName ] ] = 0) do={
    $LogPrintExit2 info $0 ("Certificate with CommonName \"" . $CommonName . "\" not available.") false;
    :if ([ $CertificateDownload $CommonName ] = false) do={
      :return false;
    }
  }

  :local CertVal [ / certificate get [ find where common-name=$CommonName ] ];
  :while (($CertVal->"akid") != "" && ($CertVal->"akid") != ($CertVal->"skid")) do={
    :if ([ :len [ / certificate find where skid=($CertVal->"akid") ] ] = 0) do={
      $LogPrintExit2 info $0 ("Certificate chain for \"" . $CommonName . \
        "\" is incomplete, missing \"" . ([ $ParseKeyValueStore ($CertVal->"issuer") ]->"CN") . "\".") false;
      :if ([ $CertificateDownload $CommonName ] = false) do={
        :return false;
      }
    }
    :set CertVal [ / certificate get [ find where skid=($CertVal->"akid") ] ];
  }
  :return true;
}

# download and import certificate
:set CertificateDownload do={
  :local CommonName [ :tostr $1 ];

  :global ScriptUpdatesBaseUrl;
  :global ScriptUpdatesUrlSuffix;

  :global CertificateNameByCN;
  :global LogPrintExit2;
  :global UrlEncode;
  :global WaitForFile;

  $LogPrintExit2 info $0 ("Downloading and importing certificate with " . \
      "CommonName \"" . $CommonName . "\".") false;
  :do {
    :local LocalFileName ($CommonName . ".pem");
    :local UrlFileName ([ $UrlEncode $CommonName ] . ".pem");
    / tool fetch check-certificate=yes-without-crl \
      ($ScriptUpdatesBaseUrl . "certs/" . \
      $UrlFileName . $ScriptUpdatesUrlSuffix) \
      dst-path=$LocalFileName as-value;
    $WaitForFile $LocalFileName;
    / certificate import file-name=$LocalFileName passphrase="" as-value;
    / file remove $LocalFileName;

    :foreach Cert in=[ / certificate find where name~("^" . $LocalFileName . "_[0-9]+\$") ] do={
      $CertificateNameByCN [ / certificate get $Cert common-name ];
    }
  } on-error={
    $LogPrintExit2 warning $0 ("Failed importing certificate with " . \
        "CommonName \"" . $CommonName . "\"!") false;
    :return false;
  }
  :return true;
}

# name a certificate by its common-name
:set CertificateNameByCN do={
  :local CommonName [ :tostr $1 ];

  :global CharacterReplace;

  :local Cert [ / certificate find where common-name=$CommonName ];
  / certificate set $Cert \
    name=[ $CharacterReplace [ $CharacterReplace [ $CharacterReplace $CommonName "'" "-" ] " " "-" ] "---" "-" ];
}

# character replace
:set CharacterReplace do={
  :local String [ :tostr $1 ];
  :local ReplaceFrom [ :tostr $2 ];
  :local ReplaceWith [ :tostr $3 ];
  :local Return "";

  :if ($ReplaceFrom = "") do={
    :return $String;
  }

  :while ([ :typeof [ :find $String $ReplaceFrom ] ] != "nil") do={
    :local Pos [ :find $String $ReplaceFrom ];
    :set Return ($Return . [ :pick $String 0 $Pos ] . $ReplaceWith);
    :set String [ :pick $String ($Pos + [ :len $ReplaceFrom ]) [ :len $String ] ];
  }

  :return ($Return . $String);
}

# clean file path
:set CleanFilePath do={
  :local Path [ :tostr $1 ];

  :global CharacterReplace;

  :while ($Path ~ "//") do={
    :set $Path [ $CharacterReplace $Path "//" "/" ];
  }
  :if ([ :pick $Path 0 ] = "/") do={
    :set Path [ :pick $Path 1 [ :len $Path ] ];
  }
  :if ([ :pick $Path ([ :len $Path ] - 1) ] = "/") do={
    :set Path [ :pick $Path 0 ([ :len $Path ] - 1) ];
  }

  :return $Path;
}

# default route is reachable
:set DefaultRouteIsReachable do={
  :if ([ :len [ / ip route find where dst-address=0.0.0.0/0 active !blackhole !routing-mark !unreachable ] ] > 0) do={
    :return true;
  }
  :return false;
}

# get readable device info
:set DeviceInfo do={
  :global ExpectedConfigVersion;
  :global GlobalConfigVersion;
  :global Identity;

  :global IfThenElse;

  :local Resource [ / system resource get ];
  :local RouterBoard;
  :do {
    :set RouterBoard [ / system routerboard get ];
  } on-error={ }
  :local License [ / system license get ];
  :local Update [ / system package update get ];

  :return ( \
         "Hostname:       " . $Identity . \
       "\nBoard name:     " . $Resource->"board-name" . \
       "\nArchitecture:   " . $Resource->"architecture-name" . \
    [ $IfThenElse ($RouterBoard->"routerboard" = true) \
      ("\nModel:          " . $RouterBoard->"model" . \
         [ $IfThenElse ([ :len ($RouterBoard->"revision") ] > 0) \
           (" " . $RouterBoard->"revision") ] . \
       "\nSerial number:  " . $RouterBoard->"serial-number") ] . \
    [ $IfThenElse ([ :len ($License->"level") ] > 0) \
       ("\nLicense:        " . $License->"level") ] . \
       "\nRouterOS:" . \
       "\n    Channel:    " . $Update->"channel" . \
       "\n    Installed:  " . $Update->"installed-version" . \
    [ $IfThenElse ([ :typeof ($Update->"latest-version") ] != "nothing" && \
        $Update->"installed-version" != $Update->"latest-version") \
      ("\n    Available:  " . $Update->"latest-version") ] . \
    [ $IfThenElse ($RouterBoard->"routerboard" = true) \
       ("\n    Firmware:   " . $RouterBoard->"current-firmware") ] . \
       "\nRouterOS-Scripts:" . \
       "\n    Current:    " . $GlobalConfigVersion . \
    [ $IfThenElse ($GlobalConfigVersion != $ExpectedConfigVersion) \
      ("\n    Expected:   " . $ExpectedConfigVersion) ]);
}

# check if DNS is resolving
:set DNSIsResolving do={
  :global CharacterReplace;

  :do {
    :resolve "low-ttl.eworm.de";
  } on-error={
    :return false;
  }
  :return true;
}

# download package from upgrade server
:set DownloadPackage do={
  :local PkgName [ :tostr $1 ];
  :local PkgVer  [ :tostr $2 ];
  :local PkgArch [ :tostr $3 ];
  :local PkgDir  [ :tostr $4 ];

  :global CertificateAvailable;
  :global CleanFilePath;
  :global LogPrintExit2;
  :global WaitForFile;

  :if ([ :len $PkgName ] = 0) do={ :return false; }
  :if ([ :len $PkgVer  ] = 0) do={ :set PkgVer  [ / system package update get installed-version ]; }
  :if ([ :len $PkgArch ] = 0) do={ :set PkgArch [ / system resource get architecture-name ]; }

  :local PkgFile ($PkgName . "-" . $PkgVer . "-" . $PkgArch . ".npk");
  :if ($PkgArch = "x86_64" || $PkgName ~ "^routeros-") do={
    :set PkgFile ($PkgName . "-" . $PkgVer . ".npk");
  }
  :local PkgDest [ $CleanFilePath ($PkgDir . "/" . $PkgFile) ];

  :if ([ :len [ / file find where name=$PkgDest type="package" ] ] > 0) do={
    $LogPrintExit2 info $0 ("Package file " . $PkgName . " already exists.") false;
    :return true;
  }

  :if ([ $CertificateAvailable "R3" ] = false) do={
    $LogPrintExit2 error $0 ("Downloading required certificate failed.") true;
  }

  $LogPrintExit2 info $0 ("Downloading package file '" . $PkgName . "'...") false;
  :local Retry 3;
  :while ($Retry > 0) do={
    :do {
      / tool fetch check-certificate=yes-without-crl \
        ("https://upgrade.mikrotik.com/routeros/" . $PkgVer . "/" . $PkgFile) \
        dst-path=$PkgDest;
      $WaitForFile $PkgDest;

      :if ([ / file get [ find where name=$PkgDest ] type ] = "package") do={
        :return true;
      }
    } on-error={
      $LogPrintExit2 debug $0 ("Downloading package file failed.") false;
    }

    / file remove [ find where name=$PkgDest ];
    :set Retry ($Retry - 1);
  }

  $LogPrintExit2 warning $0 ("Downloading package file '" . $PkgName . "' failed.") false;
  :return false;
}

# return either first (if "true") or second
:set EitherOr do={
  :global IfThenElse;

  :if ([ :typeof $1 ] = "num") do={
    :return [ $IfThenElse ($1 != 0) $1 $2 ];
  }
  :return [ $IfThenElse ([ :len [ :tostr $1 ] ] > 0) $1 $2 ];
}

# escape for regular expression
:set EscapeForRegEx do={
  :local Input [ :tostr $1 ];

  :if ([ :len $Input ] = 0) do={
    :return "";
  }

  :local Return "";
  :local Chars ("^.[]\$()|*+\?{}\\");

  :for I from=0 to=([ :len $Input ] - 1) do={
    :local Char [ :pick $Input $I ];
    :if ([ :find $Chars $Char ]) do={
      :set Char ("\\" . $Char);
    }
    :set Return ($Return . $Char);
  }

  :return $Return;
}

# flush e-mail queue
:set FlushEmailQueue do={
  :global EmailQueue;

  :global EitherOr;
  :global LogPrintExit2;

  :local AllDone true;
  :local QueueLen [ :len $EmailQueue ];

  :if ([ :len [ / system scheduler find where name="FlushEmailQueue" ] ] > 0 && $QueueLen = 0) do={
    $LogPrintExit2 warning $0 ("Flushing E-Mail messages from scheduler, but queue is empty.") false;
  }

  / system scheduler set interval=($QueueLen . "m") [ find where name="FlushEmailQueue" ];

  :foreach Id,Message in=$EmailQueue do={
    :if ([ :typeof $Message ] = "array" ) do={
      :local Attach [ $EitherOr ($Message->"attach") "" ];
      / tool e-mail send to=($Message->"to") cc=($Message->"cc") subject=($Message->"subject") \
        body=($Message->"body") file=$Attach;
      :local Wait true;
      :do {
        :delay 1s;
        :local Status [ / tool e-mail get last-status ];
        :if ($Status = "succeeded") do={
          :set ($EmailQueue->$Id);
          :set Wait false;
          :if (($Message->"remove-attach") = true) do={
            :foreach File in=[ :toarray $Attach ] do={
              / file remove $File;
            }
          }
        }
        :if ($Status = "failed") do={
          :set AllDone false;
          :set Wait false;
        }
      } while=($Wait = true);
    }
  }

  :if ($AllDone = true && $QueueLen = [ :len $EmailQueue ]) do={
    / system scheduler remove [ find where name="FlushEmailQueue" ];
    :set EmailQueue;
  } else={
    / system scheduler set interval=1m [ find where name="FlushEmailQueue" ];
  }
}

# get MAC vendor
:set GetMacVendor do={
  :local Mac [ :tostr $1 ];

  :global CertificateAvailable;
  :global LogPrintExit2;

  :do {
    :if ([ $CertificateAvailable "Cloudflare Inc ECC CA-3" ] = false) do={
      $LogPrintExit2 warning $0 ("Downloading required certificate failed.") true;
    }
    :local Vendor ([ / tool fetch check-certificate=yes-without-crl \
        ("https://api.macvendors.com/" . [ :pick $Mac 0 8 ]) output=user as-value ]->"data");
    :return $Vendor;
  } on-error={
    :do {
      / tool fetch check-certificate=yes-without-crl ("https://api.macvendors.com/") \
        output=none as-value;
      $LogPrintExit2 debug $0 ("The mac vendor is not known in database.") false;
    } on-error={
      $LogPrintExit2 warning $0 ("Failed getting mac vendor.") false;
    }
    :return "unknown vendor";
  }
}

# generate random 20 chars hex (0-9 and a-f)
:set GetRandom20CharHex do={
  :return ([ / certificate scep-server otp generate minutes-valid=0 as-value ]->"password");
}

# generate random number
:set GetRandomNumber do={
  :local Max 4294967295;
  :if ([ :typeof $1 ] != "nothing" ) do={
    :set Max ([ :tonum $1 ] + 1);
  }

  :global GetRandom20CharHex;
  :global HexToNum;

  :return ([ $HexToNum [ :pick [ $GetRandom20CharHex ] 0 15 ] ] % $Max);
}

# convert from hex (string) to num
:set HexToNum do={
  :local Input [ :tostr $1 ];
  :local Hex "0123456789abcdef0123456789ABCDEF";
  :local Multi 1;
  :local Return 0;

  :for I from=([ :len $Input ] - 1) to=0 do={
    :set Return ($Return + (([ :find $Hex [ :pick $Input $I ] ] % 16) * $Multi));
    :set Multi ($Multi * 16);
  }

  :return $Return;
}

# mimic conditional/ternary operator (condition ? consequent : alternative)
:set IfThenElse do={
  :if ([ :tostr $1 ] = "true" || [ :tobool $1 ] = true) do={
    :return $2;
  }
  :return $3;
}

# log and print with same text, optionally exit
:set LogPrintExit2 do={
  :local Severity [ :tostr $1 ];
  :local Name     [ :tostr $2 ];
  :local Message  [ :tostr $3 ];
  :local Exit     [ :tostr $4 ];

  :global PrintDebug;
  :global PrintDebugOverride;

  :global EitherOr;

  :local Debug [ $EitherOr ($PrintDebugOverride->$Name) $PrintDebug ];

  :local PrintSeverity do={
    :global TerminalColorOutput;

    :if ($TerminalColorOutput != true) do={
      :return $1;
    }

    :local Color { debug=96; info=97; warning=93; error=91 };
    :return ("\1B[" . $Color->$1 . "m" . $1 . "\1B[0m");
  }

  :local Log ($Name . ": " . $Message);
  :if ($Severity ~ ("^(debug|error|info)\$")) do={
    :if ($Severity = "debug") do={ :log debug $Log; }
    :if ($Severity = "error") do={ :log error $Log; }
    :if ($Severity = "info" ) do={ :log info  $Log; }
  } else={
    :log warning $Log;
    :set Severity "warning";
  }

  :if ($Severity != "debug" || $Debug = true) do={
    :if ($Exit = "true") do={
      :error ([ $PrintSeverity $Severity ] . ": " . $Message);
    } else={
      :put ([ $PrintSeverity $Severity ] . ": " . $Message);
    }
  }
}

# create directory
:set MkDir do={
  :local Dir [ :tostr $1 ];

  :global CleanFilePath;
  :global GetRandom20CharHex;
  :global WaitForFile;

  :set Dir [ $CleanFilePath $Dir ];

  :if ([ :len [ / file find where name=$Dir type="directory" ] ] = 1) do={
    :return true;
  }

  :local Return true;
  :local Name ($Dir . "-" . [ $GetRandom20CharHex ])
  :do {
    / ip smb share add disabled=yes directory=$Dir name=$Name;
    $WaitForFile $Dir;
  } on-error={
    :set Return false;
  }
  / ip smb share remove [ find where name=$Name ];
  :return $Return;
}

# prepare NotificationFunctions array
:if ([ :typeof $NotificationFunctions ] != "array") do={
  :set NotificationFunctions [ :toarray "" ];
}

# send notification via e-mail - expects one array argument
:set ($NotificationFunctions->"email") do={
  :local Notification $1;

  :global Identity;
  :global EmailGeneralTo;
  :global EmailGeneralToOverride;
  :global EmailGeneralCc;
  :global EmailGeneralCcOverride;
  :global EmailQueue;

  :global EitherOr;
  :global IfThenElse;
  :global QuotedPrintable;

  :local To [ $EitherOr ($EmailGeneralToOverride->($Notification->"origin")) $EmailGeneralTo ];
  :local Cc [ $EitherOr ($EmailGeneralCcOverride->($Notification->"origin")) $EmailGeneralCc ];

  :local EMailSettings [ / tool e-mail get ];
  :if ([ :len $To ] = 0 || ($EMailSettings->"address") = "0.0.0.0" || ($EMailSettings->"from") = "<>") do={
    :return false;
  }

  :if ([ :typeof $EmailQueue ] = "nothing") do={
      :set EmailQueue [ :toarray "" ];
  }
  :local Signature [ / system note get note ];
  :set ($EmailQueue->[ :len $EmailQueue ]) {
    to=$To; cc=$Cc;
    subject=[ $QuotedPrintable ("[" . $Identity . "] " . ($Notification->"subject")) ];
    body=(($Notification->"message") . \
      [ $IfThenElse ([ :len ($Notification->"link") ] > 0) ("\n\n" . ($Notification->"link")) "" ] . \
      [ $IfThenElse ([ :len $Signature ] > 0) ("\n-- \n" . $Signature) "" ]); \
    attach=($Notification->"attach"); remove-attach=($Notification->"remove-attach") };
  :if ([ :len [ / system scheduler find where name="FlushEmailQueue" ] ] = 0) do={
    / system scheduler add name=FlushEmailQueue interval=1s start-time=startup \
      on-event=(":global FlushEmailQueue; \$FlushEmailQueue;");
  }
}

# parse key value store
:set ParseKeyValueStore do={
  :local Source $1;
  :if ([ :typeof $Source ] != "array") do={
    :set Source [ :tostr $1 ];
  }
  :local Result [ :toarray "" ];
  :foreach KeyValue in=[ :toarray $Source ] do={
    :if ([ :find $KeyValue "=" ]) do={
      :set ($Result->[ :pick $KeyValue 0 [ :find $KeyValue "=" ] ]) \
        [ :pick $KeyValue ([ :find $KeyValue "=" ] + 1) [ :len $KeyValue ] ];
    } else={
      :set ($Result->$KeyValue) true;
    }
  }
  :return $Result;
}

# convert string to quoted-printable
:global QuotedPrintable do={
  :local Input [ :tostr $1 ];

  :if ([ :len $Input ] = 0) do={
    :return $Input;
  }

  :local Return "";
  :local Chars ("\80\81\82\83\84\85\86\87\88\89\8A\8B\8C\8D\8E\8F\90\91\92\93\94\95\96\97" . \
    "\98\99\9A\9B\9C\9D\9E\9F\A0\A1\A2\A3\A4\A5\A6\A7\A8\A9\AA\AB\AC\AD\AE\AF\B0\B1\B2\B3" . \
    "\B4\B5\B6\B7\B8\B9\BA\BB\BC\BD\BE\BF\C0\C1\C2\C3\C4\C5\C6\C7\C8\C9\CA\CB\CC\CD\CE\CF" . \
    "\D0\D1\D2\D3\D4\D5\D6\D7\D8\D9\DA\DB\DC\DD\DE\DF\E0\E1\E2\E3\E4\E5\E6\E7\E8\E9\EA\EB" . \
    "\EC\ED\EE\EF\F0\F1\F2\F3\F4\F5\F6\F7\F8\F9\FA\FB\FC\FD\FE\FF");
  :local Hex { "0"; "1"; "2"; "3"; "4"; "5"; "6"; "7"; "8"; "9"; "A"; "B"; "C"; "D"; "E"; "F" };

  :for I from=0 to=([ :len $Input ] - 1) do={
    :local Char [ :pick $Input $I ];
    :local Replace [ :find $Chars $Char ];

    :if ($Char = "=") do={
      :set Char "=3D";
    }
    :if ([ :typeof $Replace ] = "num") do={
      :set Char ("=" . ($Hex->($Replace / 16 + 8)) . ($Hex->($Replace % 16)));
    }
    :set Return ($Return . $Char);
  }

  :if ($Input = $Return) do={
    :return $Input;
  }

  :return ("=\?utf-8\?Q\?" . $Return . "\?=");
}

# delay a random amount of seconds
:set RandomDelay do={
  :global EitherOr;
  :global GetRandomNumber;

  :delay ([ $GetRandomNumber $1 ] . [ $EitherOr $2 "s" ]);
}

# check for required RouterOS version
:set RequiredRouterOS do={
  :local Caller   [ :tostr  $1 ];
  :local Required [ :tostr  $2 ];
  :local Warn     [ :tobool $3 ];

  :global IfThenElse;
  :global LogPrintExit2;
  :global VersionToNum;

  :if ([ $VersionToNum $Required ] > [ $VersionToNum [ / system package update get installed-version ] ]) do={
    :if ($Warn = true) do={
      $LogPrintExit2 warning $0 ("This " . [ $IfThenElse ([ :pick $Caller 0 ] = ("\$")) "function" "script" ] . \
        " '" . $Caller . "' (at least specific functionality) requires RouterOS " . $Required . ". Please update!") false;
    }
    :return false;
  }
  :return true;
}

# check if script is run from terminal
:set ScriptFromTerminal do={
  :local Script [ :tostr $1 ];

  :global LogPrintExit2;

  :foreach Job in=[ / system script job find where script=$Script ] do={
    :set Job [ / system script job get $Job ];
    :while ([ :typeof ($Job->"parent") ] = "id") do={
      :set Job [ / system script job get [ find where .id=($Job->"parent") ] ];
    }
    :if (($Job->"type") = "login") do={
      $LogPrintExit2 debug $0 ("Script " . $Script . " started from terminal.") false;
      :return true;
    }
  }
  $LogPrintExit2 debug $0 ("Script " . $Script . " NOT started from terminal.") false;

  :return false;
}

# install new scripts, update existing scripts
:set ScriptInstallUpdate do={
  :local Scripts [ :toarray $1 ];

  :global ExpectedConfigVersion;
  :global GlobalConfigVersion;
  :global Identity;
  :global IDonate;
  :global NotificationsWithSymbols;
  :global ScriptUpdatesBaseUrl;
  :global ScriptUpdatesFetch;
  :global ScriptUpdatesUrlSuffix;
  :global SentConfigChangesNotification;

  :global CertificateAvailable;
  :global IfThenElse;
  :global LogPrintExit2;
  :global ParseKeyValueStore;
  :global SendNotification2;
  :global SymbolForNotification;
  :global ValidateSyntax;

  :if ([ $CertificateAvailable "R3" ] = false) do={
    $LogPrintExit2 warning $0 ("Downloading certificate failed, trying without.") false;
  }

  :foreach Script in=$Scripts do={
    :if ([ :len [ / system script find where name=$Script ] ] = 0) do={
      $LogPrintExit2 info $0 ("Adding new script: " . $Script) false;
      / system script add name=$Script source="#!rsc by RouterOS\n";
    }
  }

  :local ExpectedConfigVersionBefore $ExpectedConfigVersion;
  :local ReloadGlobalFunctions false;
  :local ReloadGlobalConfig false;

  :foreach Script in=[ / system script find where source~"^#!rsc by RouterOS\n" ] do={
    :local ScriptVal [ / system script get $Script ];
    :local ScriptFile [ / file find where name=("script-updates/" . $ScriptVal->"name") ];
    :local SourceNew;
    :if ([ :len $ScriptFile ] > 0) do={
      :set SourceNew [ / file get $ScriptFile content ];
      / file remove $ScriptFile;
    }

    :foreach Scheduler in=[ / system scheduler find where on-event~("\\b" . $ScriptVal->"name" . "\\b") ] do={
      :local SchedulerVal [ / system scheduler get $Scheduler ];
      :if ($ScriptVal->"policy" != $SchedulerVal->"policy") do={
        $LogPrintExit2 warning $0 ("Policies differ for script " . $ScriptVal->"name" . \
          " and its scheduler " . $SchedulerVal->"name" . "!") false;
      }
    }

    :if ([ :len $SourceNew ] = 0 && $ScriptUpdatesFetch = true) do={
      :local Comment [ $ParseKeyValueStore ($ScriptVal->"comment") ];
      :if (!($Comment->"ignore" = true)) do={
        $LogPrintExit2 debug $0 ("Fetching script from url: " . $ScriptVal->"name") false;
        :do {
          :local BaseUrl $ScriptUpdatesBaseUrl;
          :local UrlSuffix $ScriptUpdatesUrlSuffix;
          :if ([ :typeof ($Comment->"base-url") ] = "str") do={ :set BaseUrl ($Comment->"base-url"); }
          :if ([ :typeof ($Comment->"url-suffix") ] = "str") do={ :set UrlSuffix ($Comment->"url-suffix"); }

          :local Result [ / tool fetch check-certificate=yes-without-crl \
              ($BaseUrl . $ScriptVal->"name" . $UrlSuffix) output=user as-value ];
          :if ($Result->"status" = "finished") do={
            :set SourceNew ($Result->"data");
          }
        } on-error={
          $LogPrintExit2 warning $0 ("Failed fetching " . $ScriptVal->"name") false;
        }
      }
    }

    :if ([ :len $SourceNew ] > 0) do={
      :if ($SourceNew != $ScriptVal->"source") do={
        :if ([ :pick $SourceNew 0 18 ] = "#!rsc by RouterOS\n") do={
          :if ([ $ValidateSyntax $SourceNew ] = true) do={
            :local DontRequirePermissions \
                ($SourceNew~"\n# requires: dont-require-permissions=yes\n");
            $LogPrintExit2 info $0 ("Updating script: " . $ScriptVal->"name") false;
            / system script set owner=($ScriptVal->"name") source=$SourceNew \
                dont-require-permissions=$DontRequirePermissions $Script;
            :if ($ScriptVal->"name" = "global-config") do={
              :set ReloadGlobalConfig true;
            }
            :if ($ScriptVal->"name" = "global-functions" || $ScriptVal->"name" ~ ("^mod/.")) do={
              :set ReloadGlobalFunctions true;
            }
          } else={
            $LogPrintExit2 warning $0 ("Syntax validation for script " . $ScriptVal->"name" . \
              " failed! Ignoring!") false;
          }
        } else={
          $LogPrintExit2 warning $0 ("Looks like new script " . $ScriptVal->"name" . \
            " is not valid (missing shebang). Ignoring!") false;
        }
      } else={
        $LogPrintExit2 debug $0 ("Script " .  $ScriptVal->"name" . " did not change.") false;
      }
    } else={
      $LogPrintExit2 debug $0 ("No update for script " . $ScriptVal->"name" . ".") false;
    }
  }

  :if ($ReloadGlobalFunctions = true) do={
    $LogPrintExit2 info $0 ("Reloading global functions.") false;
    :do {
      / system script run global-functions;
    } on-error={
      $LogPrintExit2 error $0 ("Reloading global functions failed!") false;
    }
  }

  :if ($ReloadGlobalConfig = true) do={
    $LogPrintExit2 info $0 ("Reloading global configuration.") false;
    :do {
      / system script run global-config;
    } on-error={
      $LogPrintExit2 error $0 ("Reloading global configuration failed!" . \
        " Syntax error or missing overlay\?") false;
    }
  }

  :if ($ExpectedConfigVersionBefore != $ExpectedConfigVersion) do={
    :global GlobalConfigChanges;
    :global GlobalConfigMigration;
    :local ChangeLogCode;

    $LogPrintExit2 debug $0 ("Fetching news, changes and migration.") false;
    :do {
      :local Result [ / tool fetch check-certificate=yes-without-crl \
          ($ScriptUpdatesBaseUrl . "global-config.changes" . $ScriptUpdatesUrlSuffix) \
          output=user as-value ];
      :if ($Result->"status" = "finished") do={
        :set ChangeLogCode ($Result->"data");
      }
    } on-error={
      $LogPrintExit2 warning $0 ("Failed fetching news, changes and migration!") false;
    }

    :if ([ :len $ChangeLogCode ] > 0) do={
      :if ([ $ValidateSyntax $ChangeLogCode ] = true) do={
        :do {
          [ :parse $ChangeLogCode ];
        } on-error={
          $LogPrintExit2 warning $0 ("The changelog failed to run!") false;
        }
      } else={
        $LogPrintExit2 warning $0 ("The changelog failed syntax validation!") false;
      }
    }

    :if ([ :len $GlobalConfigMigration ] > 0) do={
      :for I from=($ExpectedConfigVersionBefore + 1) to=$ExpectedConfigVersion do={
        :local Migration ($GlobalConfigMigration->[ :tostr $I ]);
        :if ([ :typeof $Migration ] = "str") do={
          :if ([ $ValidateSyntax $Migration ] = true) do={
            $LogPrintExit2 info $0 ("Applying migration for change " . $I . ": " . $Migration) false;
            :do {
              [ :parse $Migration ];
            } on-error={
              $LogPrintExit2 warning $0 ("Migration code for change " . $I . " failed to run!") false;
            }
          } else={
            $LogPrintExit2 warning $0 ("Migration code for change " . $I . " failed syntax validation!") false;
          }
        }
      }
    }

    :if ($SentConfigChangesNotification != $ExpectedConfigVersion && \
         $GlobalConfigVersion < $ExpectedConfigVersion) do={
      :local NotificationMessage ("Current configuration on " . $Identity . \
          " is out of date. Please update global-config-overlay, then increase " . \
          "\$GlobalConfigVersion (currently " . $GlobalConfigVersion . \
          ") to " . $ExpectedConfigVersion . " and re-run global-config.");
      $LogPrintExit2 info $0 ($NotificationMessage) false;

      :if ([ :len $GlobalConfigChanges ] > 0) do={
        :set NotificationMessage ($NotificationMessage . "\n\nChanges:");
        :for I from=($GlobalConfigVersion + 1) to=$ExpectedConfigVersion do={
          :local Change ($GlobalConfigChanges->[ :tostr $I ]);
          :set NotificationMessage ($NotificationMessage . "\n " . \
              [ $IfThenElse ($NotificationsWithSymbols = true) ("\E2\97\8F") "*" ] . " " . $Change);
          $LogPrintExit2 info $0 ("Change " . $I . ": " . $Change) false;
        }
      } else={
        :set NotificationMessage ($NotificationMessage . "\n\nNews and changes are not available.");
      }

      :local Link;
      :if ($IDonate != true) do={
        :set NotificationMessage ($NotificationMessage . \
          "\n\n==== donation hint ====\n" . \
          "This project is developed in private spare time and usage is " . \
          "free of charge for you. If you like the scripts and think this is " . \
          "of value for you or your business please consider a donation.");
        :set Link "https://git.eworm.de/cgit/routeros-scripts/about/#donate";
      }

      $SendNotification2 ({ origin=$0; \
        subject=([ $SymbolForNotification "pushpin" ] . "News and configuration changes"); \
        message=$NotificationMessage; link=$Link });
      :set SentConfigChangesNotification $ExpectedConfigVersion;
    }

    :set GlobalConfigChanges;
    :set GlobalConfigMigration;
  }
}

# lock script against multiple invocation
:set ScriptLock do={
  :local Script   [ :tostr $1 ];
  :local DoReturn $2;
  :local WaitMax  ([ :tonum $3 ] * 10);

  :global GetRandom20CharHex;
  :global IfThenElse;
  :global LogPrintExit2;

  :global ScriptLockOrder;
  :if ([ :typeof $ScriptLockOrder ] = "nothing") do={
    :set ScriptLockOrder [ :toarray "" ];
  }
  :if ([ :typeof ($ScriptLockOrder->$Script) ] = "nothing") do={
    :set ($ScriptLockOrder->$Script) [ :toarray "" ];
  }

  :local JobCount do={
    :local Script [ :tostr $1 ];

    :return [ :len [ / system script job find where script=$Script ] ];
  }

  :local TicketCount do={
    :local Script [ :tostr $1 ];

    :global ScriptLockOrder;

    :local Count 0;
    :foreach Ticket in=($ScriptLockOrder->$Script) do={
      :if ([ :typeof $Ticket ] != "nothing") do={
        :set Count ($Count + 1);
      }
    }
    :return $Count;
  }

  :local IsFirstTicket do={
    :local Script [ :tostr $1 ];
    :local Check  [ :tostr $2 ];

    :global ScriptLockOrder;

    :foreach Ticket in=($ScriptLockOrder->$Script) do={
      :if ($Ticket = $Check) do={ :return true; }
      :if ([ :typeof $Ticket ] != "nothing" && $Ticket != $Check) do={ :return false; }
    }
    :return false;
  }

  :local AddTicket do={
    :local Script [ :tostr $1 ];
    :local Add    [ :tostr $2 ];

    :global ScriptLockOrder;

    :while (true) do={
      :local Pos [ :len ($ScriptLockOrder->$Script) ];
      :set ($ScriptLockOrder->$Script->$Pos) $Add;
      :delay 10ms;
      :if (($ScriptLockOrder->$Script->$Pos) = $Add) do={ :return true; }
    }
  }

  :local RemoveTicket do={
    :local Script [ :tostr $1 ];
    :local Remove [ :tostr $2 ];

    :global ScriptLockOrder;

    :foreach Id,Ticket in=($ScriptLockOrder->$Script) do={
      :while (($ScriptLockOrder->$Script->$Id) = $Remove) do={
        :set ($ScriptLockOrder->$Script->$Id);
        :delay 10ms;
      }
    }
  }

  :local CleanupTickets do={
    :local Script [ :tostr $1 ];

    :global ScriptLockOrder;

    :foreach Ticket in=($ScriptLockOrder->$Script) do={
      :if ([ :typeof $Ticket ] != "nothing") do={
        :return false;
      }
    }

    :set ($ScriptLockOrder->$Script) [ :toarray "" ];
  }

  :if ([ :len [ / system script find where name=$Script ] ] = 0) do={
    $LogPrintExit2 error $0 ("A script named '" . $Script . "' does not exist!") true;
  }

  :if ([ $JobCount $Script ] = 0) do={
    $LogPrintExit2 error $0 ("No script '" . $Script . "' is running!") true;
  }

  :if ([ $TicketCount $Script ] >= [ $JobCount $Script ]) do={
    $LogPrintExit2 error $0 ("More tickets than running scripts '" . $Script . "', resetting!") false;
    :set ($ScriptLockOrder->$Script) [ :toarray "" ];
    / system script job remove [ find where script=$Script ];
  }

  :local MyTicket [ $GetRandom20CharHex ];
  $AddTicket $Script $MyTicket;

  :local WaitCount 0;
  :while ($WaitMax > $WaitCount && ([ $IsFirstTicket $Script $MyTicket ] = false || [ $TicketCount $Script ] < [ $JobCount $Script ])) do={
    :set WaitCount ($WaitCount + 1);
    :delay 100ms;
  }

  :if ([ $IsFirstTicket $Script $MyTicket ] = true && [ $TicketCount $Script ] = [ $JobCount $Script ]) do={
    $RemoveTicket $Script $MyTicket;
    $CleanupTickets $Script;
    :return false;
  }

  $RemoveTicket $Script $MyTicket;
  $LogPrintExit2 info $0 ("Script '" . $Script . "' started more than once" . [ $IfThenElse ($WaitCount > 0) \
    " and timed out waiting for lock" "" ] . "... Aborting.") [ $IfThenElse ($DoReturn = true) false true ];
  :return true;
}

# send notification via e-mail - expects at lease two string arguments
:set SendEMail do={
  :global SendEMail2;

  $SendEMail2 ({ subject=$1; message=$2; link=$3 });
}

# send notification via e-mail - expects one array argument
:set SendEMail2 do={
  :local Notification $1;

  :global NotificationFunctions;

  ($NotificationFunctions->"email") ("\$NotificationFunctions->\"email\"") $Notification;
}

# send notification via NotificationFunctions - expects at lease two string arguments
:set SendNotification do={
  :global SendNotification2;

  $SendNotification2 ({ subject=$1; message=$2; link=$3; silent=$4 });
}

# send notification via NotificationFunctions - expects one array argument
:set SendNotification2 do={
  :local Notification $1;

  :global NotificationFunctions;

  :foreach FunctionName,Discard in=$NotificationFunctions do={
    ($NotificationFunctions->$FunctionName) \
      ("\$NotificationFunctions->\"" . $FunctionName . "\"") \
      $Notification;
  }
}

# return UTF-8 symbol for unicode name
:set SymbolByUnicodeName do={
  :local Symbols {
    "alarm-clock"="\E2\8F\B0";
    "calendar"="\F0\9F\93\85";
    "chart-decreasing"="\F0\9F\93\89";
    "chart-increasing"="\F0\9F\93\88";
    "cloud"="\E2\98\81";
    "cross-mark"="\E2\9D\8C";
    "fire"="\F0\9F\94\A5";
    "floppy-disk"="\F0\9F\92\BE";
    "high-voltage-sign"="\E2\9A\A1";
    "incoming-envelope"="\F0\9F\93\A8";
    "link"="\F0\9F\94\97";
    "lock-with-ink-pen"="\F0\9F\94\8F";
    "mobile-phone"="\F0\9F\93\B1";
    "pushpin"="\F0\9F\93\8C";
    "scissors"="\E2\9C\82";
    "sparkles"="\E2\9C\A8";
    "up-arrow"="\E2\AC\86";
    "warning-sign"="\E2\9A\A0";
    "white-heavy-check-mark"="\E2\9C\85"
  }

  :return ($Symbols->$1);
}

# return symbol for notification
:set SymbolForNotification do={
  :global NotificationsWithSymbols;
  :global SymbolByUnicodeName;

  :if ($NotificationsWithSymbols != true) do={
    :return "";
  }
  :local Return "";
  :foreach Symbol in=[ :toarray $1 ] do={
    :set Return ($Return . [ $SymbolByUnicodeName $Symbol ]);
  }
  :return ($Return . " ");
}

# check if system time is sync
:set TimeIsSync do={
  :global LogPrintExit2;

  :if ([ / system ntp client get enabled ] = true) do={
    :do {
      :if ([ / system ntp client get status ] = "synchronized") do={
        :return true;
      }
    } on-error={
      :if ([ :typeof [ / system ntp client get last-adjustment ] ] = "time") do={
        :return true;
      }
    }
    :return false;
  }

  :if ([ / ip cloud get ddns-enabled ] = true && [ / ip cloud get update-time ] = true) do={
    :if ([ :typeof [ / ip cloud get public-address ] ] = "ip") do={
      :return true;
    }
    :return false;
  }

  $LogPrintExit2 debug $0 ("No time source configured! Returning gracefully...") false;
  :return true;
}

# url encoding
:set UrlEncode do={
  :local Input [ :tostr $1 ];

  :if ([ :len $Input ] = 0) do={
    :return "";
  }

  :local Return "";
  :local Chars ("\n\r !\"#\$%&'()*+,:;<=>\?@[\\]^`{|}~");
  :local Subs { "%0A"; "%0D"; "%20"; "%21"; "%22"; "%23"; "%24"; "%25"; "%26"; "%27";
         "%28"; "%29"; "%2A"; "%2B"; "%2C"; "%3A"; "%3B"; "%3C"; "%3D"; "%3E"; "%3F";
         "%40"; "%5B"; "%5C"; "%5D"; "%5E"; "%60"; "%7B"; "%7C"; "%7D"; "%7E" };

  :for I from=0 to=([ :len $Input ] - 1) do={
    :local Char [ :pick $Input $I ];
    :local Replace [ :find $Chars $Char ];

    :if ([ :typeof $Replace ] = "num") do={
      :set Char ($Subs->$Replace);
    }
    :set Return ($Return . $Char);
  }

  :return $Return;
}

# basic syntax validation
:set ValidateSyntax do={
  :local Code [ :tostr $1 ];

  :do {
    [ :parse (":local Validate do={\n" . $Code . "\n}") ];
  } on-error={
    :return false;
  }
  :return true;
}

# convert version string to numeric value
:set VersionToNum do={
  :local Input [ :tostr $1 ];
  :local Multi 0x1000000;
  :local Return 0;

  :global CharacterReplace;

  :set Input [ $CharacterReplace [ $CharacterReplace [ $CharacterReplace $Input \
    "." "," ] "beta" ",beta," ] "rc" ",rc," ];

  :foreach Value in=([ :toarray $Input ], 0) do={
    :local Num [ :tonum $Value ];
    :if ($Multi = 0x100) do={
      :if ([ :typeof $Num ] = "num") do={
        :set Return ($Return + 0xff00);
        :set Multi ($Multi / 0x100);
      } else={
        :if ($Value = "beta") do={ :set Return ($Return + 0x3f00); }
        :if ($Value = "rc") do={ :set Return ($Return + 0x7f00); }
      }
    }
    :if ([ :typeof $Num ] = "num") do={ :set Return ($Return + ($Value * $Multi)); }
    :set Multi ($Multi / 0x100);
  }

  :return $Return;
}

# wait for default route to be reachable
:set WaitDefaultRouteReachable do={
  :global DefaultRouteIsReachable;

  :while ([ $DefaultRouteIsReachable ] = false) do={
    :delay 1s;
  }
}

# wait for DNS to resolve
:set WaitDNSResolving do={
  :global DNSIsResolving;

  :while ([ $DNSIsResolving ] = false) do={
    :delay 1s;
  }
}

# wait for file to be available
:set WaitForFile do={
  :local FileName [ :tostr $1 ];

  :global CleanFilePath;

  :set FileName [ $CleanFilePath $FileName ];
  :local I 0;

  :while ([ :len [ / file find where name=$FileName ] ] = 0) do={
    :if ($I > 20) do={
      :return false;
    }
    :delay 100ms;
    :set I ($I + 1);
  }
  :return true;
}

# wait to be fully connected (default route is reachable, time is sync, DNS resolves)
:set WaitFullyConnected do={
  :global WaitDefaultRouteReachable;
  :global WaitDNSResolving;
  :global WaitTimeSync;

  $WaitDefaultRouteReachable;
  $WaitTimeSync;
  $WaitDNSResolving;
}

# wait for time to become synced
:set WaitTimeSync do={
  :global LogPrintExit2;
  :global TimeIsSync;

  :while ([ $TimeIsSync ] = false) do={
    :if ([ :len [ / system script find where name="rotate-ntp" ] ] > 0 && \
         ([ / system resource get uptime ] % (180 * 1000000000)) = 0s) do={
      :do {
        / system script run rotate-ntp;
      } on-error={
        $LogPrintExit2 debug $0 ("Running rotate-ntp failed.") false;
      }
    }
    :delay 1s;
  }
}

# load modules
:foreach Script in=[ / system script find where name ~ "^mod/." ] do={
  / system script run $Script;
}

# check for required RouterOS version
$RequiredRouterOS "global-functions" "6.47" true;

# ... and give a hint on RouterOS v7.
:if ([ $RequiredRouterOS "global-functions" "7.0" false ] = true) do={
  $LogPrintExit2 warning $0 ("RouterOS v7 brings some incompatible changes. Please switch to branch " . \
    "'routeros-v7', see https://git.eworm.de/cgit/routeros-scripts/about/#changes-for-routeros-v7") false;
}

# signal we are ready
:set GlobalFunctionsReady true;