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https://github.com/unrealircd/unrealircd.git
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Bram Matthys
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include <ares.h>
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#include <ares_version.h>
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typedef struct _dnsreq DNSReq;
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struct _dnsreq {
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DNSReq *prev, *next;
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aClient *cptr; /**< Client the request is for, if NULL then the client died */
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char ipv6; /**< Resolving for ipv6 or ipv4? */
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};
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typedef struct _dnscache DNSCache;
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struct _dnscache {
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DNSCache *prev, *next; /**< Previous and next in linked list */
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DNSCache *hprev, *hnext; /**< Previous and next in hash list */
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char *name; /**< The hostname */
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struct IN_ADDR addr; /**< Stored IP address */
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time_t expires; /**< When record expires */
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};
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typedef struct _dnsstats DNSStats;
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struct _dnsstats {
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unsigned int cache_hits;
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unsigned int cache_misses;
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unsigned int cache_adds;
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};
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/** Time to keep cache records. */
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#define DNSCACHE_TTL 600
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/** Size of the hash table (prime!).
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* Consumes <this>*4 on ia32 and <this>*4 on 64 bit
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* 241 seems a good bet.. which ~1k on ia32 and ~2k on ia64.
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*/
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#define DNS_HASH_SIZE 241
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/** Max # of entries we want in our cache.
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* This:
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* a) prevents us from using too much memory, and
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* b) prevents us from keeping useless cache records
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*
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* A dnscache item is roughly ~80 bytes in size (slightly more on x86),
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* so 241*80=~20k, which seems reasonable ;).
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*/
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#define DNS_MAX_ENTRIES DNS_HASH_SIZE
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extern ares_channel resolver_channel;
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extern void init_resolver(void);
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struct hostent *unrealdns_doclient(aClient *cptr);
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