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Add a bit of jitter to the TTL of xtransport cached IP addresses

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This commit is contained in:
Frank Denis 2025-03-26 23:00:30 +01:00
parent 5d2519e2c1
commit c030e346b5
1 changed files with 2 additions and 0 deletions
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2
dnscrypt-proxy/xtransport.go
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@ -36,6 +36,7 @@ const (
DefaultTimeout = 30 * time.Second DefaultTimeout = 30 * time.Second
SystemResolverIPTTL = 12 * time.Hour SystemResolverIPTTL = 12 * time.Hour
MinResolverIPTTL = 4 * time.Hour MinResolverIPTTL = 4 * time.Hour
ResolverIPTTLMaxJitter = 15 * time.Minute
ExpiredCachedIPGraceTTL = 15 * time.Minute ExpiredCachedIPGraceTTL = 15 * time.Minute
) )
@ -111,6 +112,7 @@ func (xTransport *XTransport) saveCachedIP(host string, ip net.IP, ttl time.Dura
if ttl < MinResolverIPTTL { if ttl < MinResolverIPTTL {
ttl = MinResolverIPTTL ttl = MinResolverIPTTL
} }
ttl += time.Duration(rand.Int63n(int64(ResolverIPTTLMaxJitter)))
expiration := time.Now().Add(ttl) expiration := time.Now().Add(ttl)
item.expiration = &expiration item.expiration = &expiration
} }