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a simple blocklist for ssh
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attack.h (444B)

      1 #ifndef _ATTACK_H
      2 #define _ATTACK_H
      3 
      4 #include <time.h>
      5 
      6 #include "queue.h"
      7 
      8 extern int fd_black;
      9 extern int fd_white;
     10 
     11 enum list {
     12 	BLACK,
     13 	WHITE,
     14 	GREY,
     15 };
     16 
     17 struct attacker {
     18 	char ip[16];
     19 	int nban;		/* [-1,8] */
     20 	time_t last;
     21 	enum list list;
     22 	SLIST_ENTRY(attacker) attackers;
     23 };
     24 
     25 int blacklist(struct attacker *);
     26 int whitelist(struct attacker *);
     27 int isattack(char *, char *);
     28 int isexpire(struct attacker *);
     29 int islogin(char *);
     30 
     31 #endif