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middleware/erratic: add delaying queries (#614)

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* middleware/erratic: add delying queries

* Dont println
This commit is contained in:
Miek Gieben
2017-04-13 16:26:17 +01:00
committed by GitHub
parent acbf522ceb
commit a83d97a5c4
5 changed files with 131 additions and 21 deletions
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33
middleware/erratic/README.md
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@@ -4,10 +4,6 @@
queries, but the responses can be delayed by a random amount of time or dropped all together, i.e.
no answer at all.
~~~ txt
._<transport>.qname. 0 IN SRV 0 0 <port> .
~~~
The *erratic* middleware will respond to every A or AAAA query. For any other type it will return
a SERVFAIL response. The reply for A will return 192.0.2.53 (see RFC 5737), for AAAA it returns
2001:DB8::53 (see RFC 3849).
@@ -16,11 +12,14 @@ a SERVFAIL response. The reply for A will return 192.0.2.53 (see RFC 5737), for
~~~ txt
erratic {
drop AMOUNT
drop [AMOUNT]
delay [AMOUNT [DURATION]]
}
~~~
* **AMOUNT** drop 1 per **AMOUNT** of the queries, the default is 2.
* `drop`: drop 1 per **AMOUNT** of the queries, the default is 2.
* `delay`: delay 1 per **AMOUNT** of queries for **DURATION**, the default for **AMOUNT** is 2 and
the default for **DURATION** is 100ms.
## Examples
@@ -32,7 +31,7 @@ erratic {
}
~~~
Or even shorter if the defaults suits you:
Or even shorter if the defaults suits you. Note this only drops queries, it does not delay them.
~~~ txt
. {
@@ -40,6 +39,22 @@ Or even shorter if the defaults suits you:
}
~~~
## Bugs
Delay 1 in 3 queries for 50ms, but also drop 1 in 2.
Delaying answers is not implemented.
~~~ txt
. {
erratic {
delay 3 50ms
}
}
~~~
To stop dropping you'll need to explicitally set that to 0:
~~~ txt
. {
erratic {
delay 3 50ms
drop 0
}
}
~~~