How cachedb encode redis Key and Value?

[Yorgos Thessalonikefs]

Hi wowon,

The function that calculates the hash is in the cachedb module at
https://github.com/NLnetLabs/unbound/blob/5588f66bdb8c8276b98a0fec4c9e04622999cfe3/cachedb/cachedb.c#L332

In short it is a hex representation of a hash that consists of the name, 
type, class and the backend secret.

Best regards,
-- Yorgos

On 06/09/2025 12:30, Bino Oetomo via Unbound-users wrote:
> I'm trying to setup unbound with cachedb and use redis as it's backend
> 
> here is my unbound config:
> ```
> server:
>      module-config: "cachedb validator iterator"
>      pidfile: "/run/unbound/unbound.pid"
>      verbosity: 4
>      log-queries: yes
>      logfile: "/var/log/unbound.log"
> 
> cachedb:
>      backend: redis
>      secret-seed: "mysecretseed2025"
>      redis-server-host: 127.0.0.1
>      redis-server-port: 6379
>      redis-logical-db: 0
> 
> ```
> 
> 
> when i try to do "dig" :
> ```
> dig @127.0.0.1 <http://127.0.0.1> www.vw.com <http://www.vw.com>
> ```
> 
> here what I got from redis-cli monitor:
> ```
> 1757153895.538580 [0 127.0.0.1:45384 <http://127.0.0.1:45384>] "GET" 
> "C17FB95ECEC29435E6559BBB5EAB981D6FDC38E0AA338F30C7E8EB5D0652346B"
> 1757153897.048882 [0 127.0.0.1:45384 <http://127.0.0.1:45384>] "SET" 
> "C17FB95ECEC29435E6559BBB5EAB981D6FDC38E0AA338F30C7E8EB5D0652346B" 
> "\x00\x00\x81\x80\x00\x01\x00\x05\x00\x00\x00\x01\x03www\x02vw\x03com\x00\x00\x01\x00\x01\xc0\x0c\x00\x05\x00\x01\x00\x00\x0e\x0f\x00!\blive-usa\x04vwng\x0elighthouselabs\x02eu\x00\xc0(\x00\x05\x00\x01\x00\x00\a\a\x00\x16\x06vw-goa\tedgesuite\x03net\x00\xc0U\x00\x05\x00\x01\x00\x00T_\x00\x13\x04a995\x04dscr\x06akamai\xc0f\xc0w\x00\x01\x00\x01\x00\x00\x00\x14\x00\x04\xd2\xd2\x91\x93\xc0w\x00\x01\x00\x01\x00\x00\x00\x14\x00\x04\xd2\xd2\x91\x98\x00\x00)\x04\xd0\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00h\xbc\ni\x00\x00\x00\x00h\xbc\n}"
> 
> ```
> 
> my question is: How unbound cachedb module "encode" that two field (key, 
> value)?
> 
> regards
> -wowon-