/*?$Id:?mod_evasive.cv?1.3?2005/10/08?19:17:14?jonz?Exp?$?*/

/*
mod_evasive?for?Apache?1.3
Copyright?（c）?by?Jonathan?A.?Zdziarski

LICENSE

This?program?is?free?software;?you?can?redistribute?it?and/or
modify?it?under?the?terms?of?the?GNU?General?Public?License
as?published?by?the?Free?Software?Foundation;?version?2
of?the?License.

This?program?is?distributed?in?the?hope?that?it?will?be?useful
but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
MERCHANTABILITY?or?FITNESS?FOR?A?PARTICULAR?PURPOSE.??See?the
GNU?General?Public?License?for?more?details.

You?should?have?received?a?copy?of?the?GNU?General?Public?License
along?with?this?program;?if?not?write?to?the?Free?Software
Foundation?Inc.?59?Temple?Place?-?Suite?330?Boston?MA??02111-1307?USA.
????????????????????????????????????????????????????????????????????????????????
*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?

#include?“httpd.h“
#include?“http_core.h“
#include?“http_config.h“
#include?“http_log.h“
#include?“http_request.h“

module?MODULE_VAR_EXPORT?evasive_module;

/*?BEGIN?DoS?Evasive?Maneuvers?Definitions?*/

#define?MAILER	“/bin/mail?-t?%s“
#define??LOG（?A?...?）?{?openlog（“mod_evasive“?LOG_PID?LOG_DAEMON）;?syslog（?A?__VA_ARGS__?）;?closelog（）;?}

#define?DEFAULT_HASH_TBL_SIZE???3079ul??//?Default?hash?table?size
#define?DEFAULT_PAGE_COUNT??????2???????//?Default?max?page?hit?count/interval
#define?DEFAULT_SITE_COUNT??????50??????//?Default?max?site?hit?count/interval
#define?DEFAULT_PAGE_INTERVAL???1???????//?Default?1?second?page?interval
#define?DEFAULT_SITE_INTERVAL???1???????//?Default?1?second?site?interval
#define?DEFAULT_BLOCKING_PERIOD?10??????//?Default?block?time?（Seconds）
#define?DEFAULT_LOG_DIR		“/tmp“

/*?END?DoS?Evasive?Maneuvers?Definitions?*/

/*?BEGIN?NTT?（Named?Timestamp?Tree）?Headers?*/

enum?{?ntt_num_primes?=?28?};

/*?ntt?root?tree?*/
struct?ntt?{
????long?size;
????long?items;
????struct?ntt_node?**tbl;
};

/*?ntt?node?（entry?in?the?ntt?root?tree）?*/
struct?ntt_node?{
????char?*key;
????time_t?timestamp;
????long?count;
????struct?ntt_node?*next;
};

/*?ntt?cursor?*/
struct?ntt_c?{
??long?iter_index;
??struct?ntt_node?*iter_next;
};

struct?ntt?*ntt_create（long?size）;
struct?ntt_node	*ntt_find（struct?ntt?*ntt?const?char?*key）;
struct?ntt_node	*ntt_insert（struct?ntt?*ntt?const?char?*key?time_t?timestamp）;
struct?ntt_node?*c_ntt_first（struct?ntt?*ntt?struct?ntt_c?*c）;
struct?ntt_node?*c_ntt_next（struct?ntt?*ntt?struct?ntt_c?*c）;
int?ntt_destroy（struct?ntt?*ntt）;
int?ntt_delete（struct?ntt?*ntt?const?char?*key）;
long?ntt_hashcode（struct?ntt?*ntt?const?char?*key）;

/*?END?NTT?（Named?Timestamp?Tree）?Headers?*/


/*?BEGIN?DoS?Evasive?Maneuvers?Globals?*/

struct?ntt?*hit_list;	//?Our?dynamic?hash?table
struct?ntt?*white_list?=?NULL;?//?White?list?ta