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#!rsc by RouterOS
# RouterOS script: netwatch-notify
# Copyright (c) 2020-2022 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# monitor netwatch and send notifications
# https://git.eworm.de/cgit/routeros-scripts/about/doc/netwatch-notify.md
:local 0 "netwatch-notify";
:global GlobalFunctionsReady;
:while ($GlobalFunctionsReady != true) do={ :delay 500ms; }
:global NetwatchNotify;
:global DNSIsResolving;
:global IfThenElse;
:global LogPrintExit2;
:global ParseKeyValueStore;
:global ScriptLock;
:global SendNotification2;
:global SymbolForNotification;
:local NetwatchNotifyHook do={
:local Name [ :tostr $1 ];
:local Type [ :tostr $2 ];
:local Hook [ :tostr $3 ];
:global LogPrintExit2;
:global ValidateSyntax;
:if ([ $ValidateSyntax $Hook ] = true) do={
:do {
[ :parse $Hook ];
} on-error={
$LogPrintExit2 warning $0 ("The " . $Type . "-hook for host " . $Name . " failed to run.") false;
:return ("The hook failed to run.");
}
} else={
$LogPrintExit2 warning $0 ("The " . $Type . "-hook for host " . $Name . " failed syntax validation.") false;
:return ("The hook failed syntax validation.");
}
$LogPrintExit2 info $0 ("Ran hook on host " . $Name . " " . $Type . ": " . $Hook) false;
:return ("Ran hook:\n" . $Hook);
}
$ScriptLock $0;
:if ([ /system/resource/get uptime ] < 5m) do={
$LogPrintExit2 info $0 ("System just booted, giving netwatch some time to settle.") true;
}
:if ([ :typeof $NetwatchNotify ] = "nothing") do={
:set NetwatchNotify [ :toarray "" ];
}
:foreach Host in=[ /tool/netwatch/find where comment~"notify" disabled=no ] do={
:local HostVal [ /tool/netwatch/get $Host ];
:local HostInfo [ $ParseKeyValueStore ($HostVal->"comment") ];
:if ($HostInfo->"notify" = true && $HostInfo->"disabled" != true) do={
:local HostName ($HostInfo->"hostname");
:local Metric { "count"=0; "notified"=false };
:if ([ :typeof ($NetwatchNotify->$HostName) ] = "array") do={
:set $Metric ($NetwatchNotify->$HostName);
}
:if ([ :typeof ($HostInfo->"resolve") ] = "str") do={
:if ([ $DNSIsResolving ] = true) do={
:do {
:local Resolve [ :resolve ($HostInfo->"resolve") ];
:if ($Resolve != $HostVal->"host") do={
$LogPrintExit2 info $0 ("Name '" . $HostInfo->"resolve" . [ $IfThenElse ($HostInfo->"resolve" != \
$HostInfo->"hostname") ("' for host '" . $HostInfo->"hostname") "" ] . \
"' resolves to different address " . $Resolve . ", updating.") false;
/tool/netwatch/set host=$Resolve $Host;
:set ($Metric->"resolve-failed") false;
}
} on-error={
:if ($Metric->"resolve-failed" != true) do={
$LogPrintExit2 warning $0 ("Resolving name '" . $HostInfo->"resolve" . [ $IfThenElse ($HostInfo->"resolve" != \
$HostInfo->"hostname") ("' for host '" . $HostInfo->"hostname") "" ] . "' failed.") false;
:set ($Metric->"resolve-failed") true;
}
}
}
}
:if ($HostVal->"status" = "up") do={
:local Count ($Metric->"count");
:if ($Count > 0) do={
$LogPrintExit2 info $0 ("Host " . $HostName . " (" . $HostVal->"host" . ") is up.") false;
:set ($Metric->"count") 0;
}
:if ($Metric->"notified" = true) do={
:local Message ("Host " . $HostName . " (" . $HostVal->"host" . ") is up since " . $HostVal->"since" . ".\n" . \
"It was down for " . $Count . " checks since " . ($Metric->"since") . ".");
:if ([ :typeof ($HostInfo->"up-hook") ] = "str") do={
:set Message ($Message . "\n\n" . [ $NetwatchNotifyHook $HostName "up" ($HostInfo->"up-hook") ]);
}
$SendNotification2 ({ origin=$0; \
subject=([ $SymbolForNotification "white-heavy-check-mark" ] . "Netwatch Notify: " . $HostName . " up"); \
message=$Message });
}
:set ($Metric->"notified") false;
:set ($Metric->"parent") ($HostInfo->"parent");
:set ($Metric->"since");
} else={
:set ($Metric->"count") ($Metric->"count" + 1);
:set ($Metric->"parent") ($HostInfo->"parent");
:set ($Metric->"since") ($HostVal->"since");
:local Count [ $IfThenElse ([ :tonum ($HostInfo->"count") ] > 0) ($HostInfo->"count") 5 ];
:local Parent ($HostInfo->"parent");
:while ([ :len $Parent ] > 0) do={
:set Count ($Count + 1);
:set Parent ($NetwatchNotify->$Parent->"parent");
}
:set Parent ($HostInfo->"parent");
:local ParentNotified false;
:while ($ParentNotified = false && [ :len $Parent ] > 0) do={
:set ParentNotified [ $IfThenElse (($NetwatchNotify->$Parent->"notified") = true) true false ];
:if ($ParentNotified = false) do={
:set Parent ($NetwatchNotify->$Parent->"parent");
}
}
$LogPrintExit2 [ $IfThenElse ($HostInfo->"no-down-notification" != true) info debug ] $0 \
("Host " . $HostName . " (" . $HostVal->"host" . ") is down for " . $Metric->"count" . " checks, " . \
[ $IfThenElse ($ParentNotified = false) [ $IfThenElse ($Metric->"notified" = true) ("already notified.") \
($Count - $Metric->"count" . " to go.") ] ("parent host " . $Parent . " is down.") ]) false;
:if ((($Count * 2) - ($Metric->"count" * 3)) / 2 = 0 && [ :typeof ($HostInfo->"pre-down-hook") ] = "str") do={
$NetwatchNotifyHook $HostName "pre-down" ($HostInfo->"pre-down-hook");
}
:if ($ParentNotified = false && $Metric->"count" >= $Count && $Metric->"notified" != true) do={
:local Message ("Host " . $HostName . " (" . $HostVal->"host" . ") is down since " . $HostVal->"since" . ".");
:if ([ :typeof ($HostInfo->"down-hook") ] = "str") do={
:set Message ($Message . "\n\n" . [ $NetwatchNotifyHook $HostName "down" ($HostInfo->"down-hook") ]);
}
:if ($HostInfo->"no-down-notification" != true) do={
$SendNotification2 ({ origin=$0; \
subject=([ $SymbolForNotification "cross-mark" ] . "Netwatch Notify: " . $HostName . " down"); \
message=$Message });
}
:set ($Metric->"notified") true;
}
}
:set ($NetwatchNotify->$HostName) {
"count"=($Metric->"count");
"notified"=($Metric->"notified");
"parent"=($Metric->"parent");
"resolve-failed"=($Metric->"resolve-failed");
"since"=($Metric->"since") };
}
}
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