unrealircd

- supernets unrealircd source & configuration
git clone git://git.acid.vegas/unrealircd.git
dns.h (1965B)
      1 /* OMG... OMG! WHAT AN INCLUDE HORROR !!! */
      2 #include <ares.h>
      3 #include <ares_version.h>
      4 
      5 typedef enum {
      6 	DNSREQ_CLIENT = 1,
      7 	DNSREQ_LINKCONF = 2,
      8 	DNSREQ_CONNECT = 3
      9 } DNSReqType;
     10 
     11 typedef struct DNSReq DNSReq;
     12 
     13 /* Depending on the request type, some fields are filled in:
     14  * cptr: DNSREQ_CLIENT, DNSREQ_CONNECT
     15  * link: DNSREQ_LINKCONF, DNSREQ_CONNECT
     16  */
     17 
     18 struct DNSReq {
     19 	DNSReq *prev, *next;
     20 	char *name; /**< Name being resolved (only for DNSREQ_LINKCONF and DNSREQ_CONNECT) */
     21 	char ipv6; /**< Resolving for ipv6 or ipv4? */
     22 	DNSReqType type; /**< DNS Request type (DNSREQ_*) */
     23 	Client *client; /**< Client the request is for, NULL if client died OR unavailable */
     24 	ConfigItem_link *linkblock; /**< Linkblock */
     25 };
     26 
     27 typedef struct DNSCache DNSCache;
     28 
     29 struct DNSCache {
     30 	DNSCache *prev, *next;		/**< Previous and next in linked list */
     31 	DNSCache *hprev, *hnext;	/**< Previous and next in hash list */
     32 	char *name;					/**< The hostname */
     33 	char *ip;					/**< The IP address */
     34 	time_t expires;				/**< When record expires */
     35 };
     36 
     37 typedef struct DNSStats DNSStats;
     38 
     39 struct DNSStats {
     40 	unsigned int cache_hits;
     41 	unsigned int cache_misses;
     42 	unsigned int cache_adds;
     43 };
     44 
     45 /** Time to keep cache records. */
     46 #define DNSCACHE_TTL			600
     47 
     48 /** Size of the hash table (prime!).
     49  * Consumes <this>*4 on ia32 and <this>*4 on 64 bit
     50  * 241 seems a good bet.. which ~1k on ia32 and ~2k on ia64.
     51  */
     52 #define DNS_HASH_SIZE	241
     53 
     54 /** Max # of entries we want in our cache.
     55  * This:
     56  * a) prevents us from using too much memory, and
     57  * b) prevents us from keeping useless cache records
     58  *
     59  * A dnscache item is roughly ~80 bytes in size (slightly more on x86),
     60  * so 241*80=~20k, which seems reasonable ;).
     61  */
     62 #define DNS_MAX_ENTRIES	DNS_HASH_SIZE
     63 
     64 
     65 extern ares_channel resolver_channel;
     66 
     67 extern void init_resolver(int);
     68 
     69 struct hostent *unrealdns_doclient(Client *cptr);
     70 
     71 extern void unreal_gethostbyname(const char *name, int family, ares_host_callback callback, void *arg);
     72