Implement simulation mode for cookies (de/en)cryption

This should close #102

This commit can be useful for two use-cases:

1. When deploying Snuffleupagus on big CMS like Magento, and not knowing
   what cookies are modified via javascript.
2. When deploying Snuffleupagus on big websites: you don't want to disconnect
   every single user at once.

When simulation is enabled, if the decryption fails, a log message is
now issued, and the cookie value taken as it (since odds are that it's
non-encrypted).

1 files changed, 1 insertions, 0 deletions

diff --git a/src/sp_config.h b/src/sp_config.h
index 86513f9..3a7a79c 100644
--- a/src/sp_config.h
+++ b/src/sp_config.h
@@ -58,6 +58,7 @@ typedef struct { bool enable; } sp_config_disable_xxe;
 typedef struct {
   enum samesite_type {strict=1, lax=2} samesite;
   bool encrypt;
+        bool simulation;
 } sp_cookie;
 
 typedef struct {