#define QUERY 0 /**< Forward (normal) DNS query operation. */
#define NO_ERRORS 0 /**< No errors processing a query. */
#define SERVFAIL 2 /**< Server error while processing a query. */
+#define NXDOMAIN 3 /**< Domain name in query does not exist. */
#define T_A 1 /**< Hostname -> IPv4 query type. */
#define T_AAAA 28 /**< Hostname -> IPv6 query type. */
#define T_PTR 12 /**< IP(v4 or v6) -> hostname query type. */
unsigned short port; /**< Port number, host-endian. */
};
-/** DNS reply structure. */
-struct DNSReply
-{
- char *h_name; /**< Hostname. */
- struct irc_in_addr addr; /**< IP address. */
-};
-
-/** DNS callback structure. */
-struct DNSQuery
-{
- void *vptr; /**< pointer used by callback to identify request */
- void (*callback)(void* vptr, struct DNSReply *reply); /**< callback to call */
-};
+/** DNS callback function signature. */
+typedef void (*dns_callback_f)(void *vptr, const struct irc_in_addr *addr, const char *h_name);
/** DNS query and response header. */
typedef struct
} HEADER;
extern void restart_resolver(void);
+extern void clear_nameservers(void);
+extern void add_nameserver(const char *ipaddr);
extern void add_local_domain(char *hname, size_t size);
extern size_t cres_mem(struct Client* cptr);
extern void delete_resolver_queries(const void *vptr);
extern void report_dns_servers(struct Client *source_p, const struct StatDesc *sd, char *param);
-extern void gethost_byname(const char *name, const struct DNSQuery *query);
-extern void gethost_byaddr(const struct irc_in_addr *addr, const struct DNSQuery *query);
-
-extern int irc_in_addr_valid(const struct irc_in_addr *addr);
-extern int irc_in_addr_cmp(const struct irc_in_addr *a, const struct irc_in_addr *b);
-extern int irc_in_addr_is_ipv4(const struct irc_in_addr *addr);
-extern int irc_in_addr_is_loopback(const struct irc_in_addr *addr);
+extern void gethost_byname(const char *name, dns_callback_f callback, void *ctx);
+extern void gethost_byaddr(const struct irc_in_addr *addr, dns_callback_f callback, void *ctx);
+
+/** Evaluate to non-zero if \a ADDR is an unspecified (all zeros) address. */
+#define irc_in_addr_unspec(ADDR) (((ADDR)->in6_16[0] == 0) \
+ && ((ADDR)->in6_16[1] == 0) \
+ && ((ADDR)->in6_16[2] == 0) \
+ && ((ADDR)->in6_16[3] == 0) \
+ && ((ADDR)->in6_16[4] == 0) \
+ && ((ADDR)->in6_16[6] == 0) \
+ && ((ADDR)->in6_16[7] == 0) \
+ && ((ADDR)->in6_16[5] == 0 \
+ || (ADDR)->in6_16[5] == 65535))
+/** Evaluate to non-zero if \a ADDR is a valid address (not all 0s and not all 1s). */
+#define irc_in_addr_valid(ADDR) (((ADDR)->in6_16[0] && ~(ADDR)->in6_16[0]) \
+ || (ADDR)->in6_16[1] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[2] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[3] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[4] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[5] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[6] != (ADDR)->in6_16[0] \
+ || (ADDR)->in6_16[7] != (ADDR)->in6_16[0])
+/** Evaluate to non-zero if \a ADDR (of type struct irc_in_addr) is an IPv4 address. */
+#define irc_in_addr_is_ipv4(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
+ && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \
+ && ((!(ADDR)->in6_16[5] && (ADDR)->in6_16[6]) \
+ || (ADDR)->in6_16[5] == 65535))
+/** Evaluate to non-zero if \a A is a different IP than \a B. */
+#define irc_in_addr_cmp(A,B) (irc_in_addr_is_ipv4(A) ? ((A)->in6_16[6] != (B)->in6_16[6] \
+ || (A)->in6_16[7] != (B)->in6_16[7] || !irc_in_addr_is_ipv4(B)) \
+ : memcmp((A), (B), sizeof(struct irc_in_addr)))
+/** Evaluate to non-zero if \a ADDR is a loopback address. */
+#define irc_in_addr_is_loopback(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
+ && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \
+ && ((!(ADDR)->in6_16[5] \
+ && ((!(ADDR)->in6_16[6] && (ADDR)->in6_16[7] == htons(1)) \
+ || (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)) \
+ || (((ADDR)->in6_16[5] == 65535) \
+ && (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)))
#endif