#!rsc by RouterOS
# RouterOS script: netwatch-notify
# Copyright (c) 2020-2024 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# requires RouterOS, version=7.12
#
# monitor netwatch and send notifications
# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-notify.md
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
:local Main do={
:local ScriptName [ :tostr $1 ];
:global NetwatchNotify;
:global EitherOr;
:global IfThenElse;
:global IsDNSResolving;
:global LogPrintExit2;
:global ParseKeyValueStore;
:global ScriptFromTerminal;
:global ScriptLock;
:global SendNotification2;
:global SymbolForNotification;
:local NetwatchNotifyHook do={
:local Name [ :tostr $1 ];
:local Type [ :tostr $2 ];
:local State [ :tostr $3 ];
:local Hook [ :tostr $4 ];
:global LogPrintExit2;
:global ValidateSyntax;
:if ([ $ValidateSyntax $Hook ] = true) do={
:do {
[ :parse $Hook ];
} on-error={
$LogPrintExit2 warning $0 ("The " . $State . "-hook for " . $Type . " '" . $Name . \
"' failed to run.") false;
:return ("The hook failed to run.");
}
} else={
$LogPrintExit2 warning $0 ("The " . $State . "-hook for " . $Type . " '" . $Name . \
"' failed syntax validation.") false;
:return ("The hook failed syntax validation.");
}
$LogPrintExit2 info $0 ("Ran hook on " . $Type . " '" . $Name . "' " . $State . ": " . \
$Hook) false;
:return ("Ran hook:\n" . $Hook);
}
:local ResolveExpected do={
:local Name [ :tostr $1 ];
:local Expected [ :tostr $2 ];
:global GetRandom20CharAlNum;
:local FwAddrList ($0 . "-" . [ $GetRandom20CharAlNum ]);
/ip/firewall/address-list/add address=$Name list=$FwAddrList dynamic=yes timeout=1s;
:delay 20ms;
:if ([ :len [ /ip/firewall/address-list/find where list=$FwAddrList address=$Expected ] ] > 0) do={
:return true;
}
/ipv6/firewall/address-list/add address=$Name list=$FwAddrList dynamic=yes timeout=1s;
:delay 20ms;
:if ([ :len [ /ipv6/firewall/address-list/find where list=$FwAddrList address=$Expected ] ] > 0) do={
:return true;
}
:return false;
}
:if ([ $ScriptLock $ScriptName ] = false) do={
:return false;
}
:local ScriptFromTerminalCached [ $ScriptFromTerminal $ScriptName ];
:if ([ :typeof $NetwatchNotify ] = "nothing") do={
:set NetwatchNotify ({});
}
:foreach Host in=[ /tool/netwatch/find where comment~"\\bnotify\\b" !disabled status!="unknown" ] do={
:local HostVal [ /tool/netwatch/get $Host ];
:local Type [ $IfThenElse ($HostVal->"type" ~ "^(https?-get|tcp-conn)\$") "service" "host" ];
:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
:local HostDetails ($HostVal->"host" . \
[ $IfThenElse ([ :len ($HostInfo->"resolve") ] > 0) (", " . $HostInfo->"resolve") ]);
:if ($HostInfo->"notify" = true && $HostInfo->"disabled" != true) do={
:local Name [ $EitherOr ($HostInfo->"name") ($HostVal->"name") ];
:local Metric { "count-down"=0; "count-up"=0; "notified"=false; "resolve-failcnt"=0 };
:if ([ :typeof ($NetwatchNotify->$Name) ] = "array") do={
:set $Metric ($NetwatchNotify->$Name);
}
:if ([ :typeof ($HostInfo->"resolve") ] = "str") do={
:if ([ $IsDNSResolving ] = true) do={
:do {
:local Resolve [ :resolve ($HostInfo->"resolve") ];
:if ($Resolve != $HostVal->"host") do={
:if ([ $ResolveExpected ($HostInfo->"resolve") ($HostVal->"host") ] = false) do={
$LogPrintExit2 info $ScriptName ("Name '" . $HostInfo->"resolve" . [ $IfThenElse \
($HostInfo->"resolve" != $HostInfo->"name") ("' for " . $Type . " '" . \
$HostInfo->"name") "" ] . "' resolves to different address " . $Resolve . \
", updating.") false;
/tool/netwatch/set host=$Resolve $Host;
:set ($Metric->"resolve-failcnt") 0;
:set ($HostVal->"status") "unknown";
}
}
} on-error={
:set ($Metric->"resolve-failcnt") ($Metric->"resolve-failcnt" + 1);
:if ($Metric->"resolve-failcnt" = 3) do={
$LogPrintExit2 warning $ScriptName ("Resolving name '" . $HostInfo->"resolve" . [ $IfThenElse \
($HostInfo->"resolve" != $HostInfo->"name") ("' for " . $Type . " '" . \
$HostInfo->"name") "" ] . "' failed.") false;
}
}
}
}
:if ($HostVal->"status" = "up") do={
:local CountDown ($Metric->"count-down");
:if ($CountDown > 0) do={
$LogPrintExit2 info $ScriptName \
("The " . $Type . " '" . $Name . "' (" . $HostDetails . ") is up.") false;
:set ($Metric->"count-down") 0;
}
:set ($Metric->"count-up") ($Metric->"count-up" + 1);
:if ($Metric->"notified" = true) do={
:local Message ("The " . $Type . " '" . $Name . "' (" . $HostDetails . \
") is up since " . $HostVal->"since" . ".\n" . \
"It was down for " . $CountDown . " checks since " . ($Metric->"since") . ".");
:if ([ :typeof ($HostInfo->"note") ] = "str") do={
:set Message ($Message . "\n\nNote:\n" . ($HostInfo->"note"));
}
:if ([ :typeof ($HostInfo->"up-hook") ] = "str") do={
:set Message ($Message . "\n\n" . [ $NetwatchNotifyHook $Name $Type "up" \
($HostInfo->"up-hook") ]);
}
$SendNotification2 ({ origin=[ $EitherOr ($HostInfo->"origin") $ScriptName ]; silent=($HostInfo->"silent"); \
subject=([ $SymbolForNotification "white-heavy-check-mark" ] . "Netwatch Notify: " . $Name . " up"); \
message=$Message });
}
:set ($Metric->"notified") false;
:set ($Metric->"parent") ($HostInfo->"parent");
:set ($Metric->"since");
}
:if ($HostVal->"status" = "down") do={
:set ($Metric->"count-down") ($Metric->"count-down" + 1);
:set ($Metric->"count-up") 0;
:set ($Metric->"parent") ($HostInfo->"parent");
:set ($Metric->"since") ($HostVal->"since");
:local CountDown [ $IfThenElse ([ :tonum ($HostInfo->"count") ] > 0) ($HostInfo->"count") 5 ];
:local Parent ($HostInfo->"parent");
:local ParentUp false;
:while ([ :len $Parent ] > 0) do={
:set CountDown ($CountDown + 1);
:set Parent ($NetwatchNotify->$Parent->"parent");
}
:set Parent ($HostInfo->"parent");
:local ParentNotified false;
:while ($ParentNotified = false && [ :len $Parent ] > 0) do={
:set ParentNotified [ $IfThenElse (($NetwatchNotify->$Parent->"notified") = true) \
true false ];
:set ParentUp ($NetwatchNotify->$Parent->"count-up");
:if ($ParentNotified = false) do={
:set Parent ($NetwatchNotify->$Parent->"parent");
}
}
:if ($Metric->"notified" = false || $Metric->"count-down" % 120 = 0 || \
$ScriptFromTerminalCached = true) do={
$LogPrintExit2 [ $IfThenElse ($HostInfo->"no-down-notification" != true) info debug ] $ScriptName \
("The " . $Type . " '" . $Name . "' (" . $HostDetails . ") is down for " . \
$Metric->"count-down" . " checks, " . [ $IfThenElse ($ParentNotified = false) [ $IfThenElse \
($Metric->"notified" = true) ("already notified.") ($CountDown - $Metric->"count-down" . \
" to go.") ] ("parent " . $Type . " " . $Parent . " is down.") ]) false;
}
:if ((($CountDown * 2) - ($Metric->"count-down" * 3)) / 2 = 0 && \
[ :typeof ($HostInfo->"pre-down-hook") ] = "str") do={
$NetwatchNotifyHook $Name $Type "pre-down" ($HostInfo->"pre-down-hook");
}
:if ($ParentNotified = false && $Metric->"count-down" >= $CountDown && \
($ParentUp = false || $ParentUp > 2) && $Metric->"notified" != true) do={
:local Message ("The " . $Type . " '" . $Name . "' (" . $HostDetails . \
") is down since " . $HostVal->"since" . ".");
:if ([ :typeof ($HostInfo->"note") ] = "str") do={
:set Message ($Message . "\n\nNote:\n" . ($HostInfo->"note"));
}
:if ([ :typeof ($HostInfo->"down-hook") ] = "str") do={
:set Message ($Message . "\n\n" . [ $NetwatchNotifyHook $Name $Type "down" \
($HostInfo->"down-hook") ]);
}
:if ($HostInfo->"no-down-notification" != true) do={
$SendNotification2 ({ origin=[ $EitherOr ($HostInfo->"origin") $ScriptName ]; silent=($HostInfo->"silent"); \
subject=([ $SymbolForNotification "cross-mark" ] . "Netwatch Notify: " . $Name . " down"); \
message=$Message });
}
:set ($Metric->"notified") true;
}
}
:set ($NetwatchNotify->$Name) {
"count-down"=($Metric->"count-down");
"count-up"=($Metric->"count-up");
"notified"=($Metric->"notified");
"parent"=($Metric->"parent");
"resolve-failcnt"=($Metric->"resolve-failcnt");
"since"=($Metric->"since") };
}
}
}
$Main [ :jobname ];