all: add option to set minimum TTL

In the rescached.cfg, we add option where user can force the minimum
TTL in the DNS answer.
This option is not a standard and not recommended used in public
facing network.
It should be used only for personal and private network.

1 files changed, 7 insertions, 0 deletions

diff --git a/environment.go b/environment.go
index 7df8bcd..af2e364 100644
--- a/environment.go
+++ b/environment.go
@@ -82,6 +82,13 @@ type Environment struct {
 
 	dns.ServerOptions
 
+	// MinimumTTL force the TTL in the answer to this value.
+	// The value is in seconds, default to 0 (disabled).
+	// Note that this option is not standard and obviously not recommended
+	// for resolver facing public networks.
+	// It should be used only in personal or private network.
+	MinimumTTL uint32 `ini:"rescached::minimum_ttl"`
+
 	Debug int `ini:"rescached::debug"`
 }