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Protect your Forgejo instance against AI scrapers with iocaine

Recently AI scrapers started endlessly crawling my forgejo instance and causes a persistent CPU usage above 80%. So I decided to feed them with iocaine. The config is shared to benefit the community

In your flake.nix:

Add iocaine to inputs (The current version in nixpkgs is too old):

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#include <stdio.h>
#include <linux/fcntl.h> /* Definition of AT_* constants */
#include <unistd.h>

int main()
{
    char *argv[] = {"true", "-l", NULL};
    char *envp[] = {"PATH=/bin", NULL};
    int dirfd = open("/bin", O_RDONLY | O_DIRECTORY);
    if (!dirfd)

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namespace std {
     typedef long unsigned int size_t;
     typedef long int ptrdiff_t;
     inline namespace __cxx11 __attribute__((__abi_tag__ ("cxx11"))) {
  }
     constexpr inline bool   __is_constant_evaluated() noexcept   {
      return __builtin_is_constant_evaluated();
    }
   }
    namespace std {

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diff --git a/net/netfilter/xt_qtaguid.c b/net/netfilter/xt_qtaguid.c
index 635fcf7a8a8e..28c34a726666 100644
--- a/net/netfilter/xt_qtaguid.c
+++ b/net/netfilter/xt_qtaguid.c
@@ -739,7 +739,7 @@ static int iface_stat_fmt_proc_show(struct seq_file *m, void *v)
 {
 	struct proc_iface_stat_fmt_info *p = m->private;
 	struct iface_stat *iface_entry;
-	struct rtnl_link_stats64 dev_stats, *stats;
+	struct rtnl_link_stats64 *stats;