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Use passed in neg and key cache if non-NULL.

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With this the neg and key caches can be shared between multiple
libunbound contexts.

The msg and rrset caches already allowed this since context_finalize()
did not touch those if they are already available and have the correct
size.

Care must be taken to properly unhook the caches from the validator
environment before calling ub_ctx_delete() otherwise one risks double
free or use after free bugs.
This commit is contained in:
Florian Obser 2019-12-19 13:20:34 +01:00
parent 1d45b4a1e0
commit da6ac0c4ff
1 changed files with 4 additions and 0 deletions
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4
validator/validator.c
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@ -121,6 +121,8 @@ val_apply_cfg(struct module_env* env, struct val_env* val_env,
log_err("out of memory");
return 0;
}
if (env->key_cache)
val_env->kcache = env->key_cache;
if(!val_env->kcache)
val_env->kcache = key_cache_create(cfg);
if(!val_env->kcache) {
@ -146,6 +148,8 @@ val_apply_cfg(struct module_env* env, struct val_env* val_env,
log_err("validator: cannot apply nsec3 key iterations");
return 0;
}
if (env->neg_cache)
val_env->neg_cache = env->neg_cache;
if(!val_env->neg_cache)
val_env->neg_cache = val_neg_create(cfg,
val_env->nsec3_maxiter[val_env->nsec3_keyiter_count-1]);