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dhcp_protect
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A userspace application that filters DHCP floods to protect a DHCP server. It uses the Netfilter userspace packet queuing API.
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dhcp_protect/dhcp_protect.h

dhcp_protect.h 671B
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  1. typedef struct dp_conf {

  2. 	int pktint;

  3. 	int interval;

  4. 	int debug;

  5. 	int bltime;

  6. 	int queue;

  7. } dp_conf;

  8. 

  9. typedef struct dp_blacklist {

  10. 	char remoteid[256];

  11. 	int len;

  12. 	int count;

  13. 	UT_hash_handle hh;

  14. } dp_blacklist;

  15. 

  16. static dp_blacklist *blacklists = NULL;

  17. static time_t dp_timestamp = 0;

  18. 

  19. void       usage       (char*);

  20. dp_conf   *load_config (dp_conf*, char*);

  21. u_int32_t  dhcp_check  (struct nfq_data*, int*, dp_conf*);

  22. static int dp_callback (struct nfq_q_handle*, struct nfgenmsg*, struct nfq_data*, void*);

  23. void       nfq_start   (dp_conf*);

  24. void       dp_blacklist_count (dp_conf*, unsigned char *, int);

  25. int        dp_blacklist_check (dp_conf*, unsigned char *, int);