mirror of
https://github.com/unrealircd/unrealircd.git
synced 2026-06-26 05:16:38 +02:00
Bram Matthys
eddb406807
This should get rid of some annoying untracable (and usually rare) crashbugs in the old resolver. Besides that, it makes things look more clean and understandable. This should be the fix for the following bugids (all the same issue): #2499, #2551, #2558, #2559, #2603, #2642, #2502, #2501, #2618, #2616. Feedback and testing is very much welcomed (syzop@unrealircd.com).
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/* OMG... OMG! WHAT AN INCLUDE HORROR !!! */
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#undef strcasecmp
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#undef strncasecmp
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#ifdef WIN32
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#include <win32/ares/setup.h>
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#endif
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#include <ares.h>
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#include <ares_version.h>
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#undef strcasecmp
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#undef strncasecmp
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#ifndef GOT_STRCASECMP
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#define strcasecmp mycmp
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#define strncasecmp myncmp
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#endif
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typedef enum {
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DNSREQ_CLIENT = 1,
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DNSREQ_LINKCONF = 2,
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DNSREQ_CONNECT = 3
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} DNSReqType;
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typedef struct _dnsreq DNSReq;
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/* Depending on the request type, some fields are filled in:
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* cptr: DNSREQ_CLIENT, DNSREQ_CONNECT
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* link: DNSREQ_LINKCONF, DNSREQ_CONNECT
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*/
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struct _dnsreq {
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DNSReq *prev, *next;
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char *name; /**< Name being resolved (only for DNSREQ_LINKCONF and DNSREQ_CONNECT) */
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char ipv6; /**< Resolving for ipv6 or ipv4? */
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DNSReqType type; /**< DNS Request type (DNSREQ_*) */
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aClient *cptr; /**< Client the request is for, NULL if client died OR unavailable */
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ConfigItem_link *linkblock; /**< Linkblock */
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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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