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plugin/rewrite: Allow configuring min and max TTL values when rewriting TTL (#5508)

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AndreasHuber-CH
2022-08-17 21:33:51 +02:00
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commit b55cee4d1a
3 changed files with 93 additions and 23 deletions
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plugin/rewrite/README.md
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@@ -311,7 +311,27 @@ The syntax for the TTL rewrite rule is as follows. The meaning of
An omitted type is defaulted to `exact`.
```
rewrite [continue|stop] ttl [exact|prefix|suffix|substring|regex] STRING SECONDS
rewrite [continue|stop] ttl [exact|prefix|suffix|substring|regex] STRING [SECONDS|MIN-MAX]
```
It is possible to supply a range of TTL values in the `SECONDS` parameters instead of a single value.
If a range is supplied, the TTL value is set to `MIN` if it is below, or set to `MAX` if it is above.
The TTL value is left unchanged if it is already inside the provided range.
The ranges can be unbounded on either side.
TTL examples with ranges:
```
# rewrite TTL to be between 30s and 300s
rewrite ttl example.com. 30-300
# cap TTL at 30s
rewrite ttl example.com. -30 # equivalent to rewrite ttl example.com. 0-30
# increase TTL to a minimum of 30s
rewrite ttl example.com. 30-
# set TTL to 30s
rewrite ttl example.com. 30 # equivalent to rewrite ttl example.com. 30-30
```
## EDNS0 Options