res_private.h

   1 #ifndef res_9_private_h
   2 #define res_9_private_h
   3 #include <arpa/inet.h>
   4 #include <sys/time.h>
   5 #include <stdint.h>
   6
   7 #pragma GCC visibility push(hidden)
   8
   9 /*
  10  * status codes from dns_res_xxx SPIs
  11  * positive numbers are ns_rcode values.
  12  */
  13 #define DNS_RES_STATUS_TIMEOUT -1001
  14 #define DNS_RES_STATUS_CANCELLED -1002
  15 #define DNS_RES_STATUS_INVALID_QUERY -1003
  16 #define DNS_RES_STATUS_INVALID_ARGUMENT -1004
  17 #define DNS_RES_STATUS_INVALID_RES_STATE -1005
  18 #define DNS_RES_STATUS_INVALID_REPLY -1006
  19 #define DNS_RES_STATUS_CONNECTION_REFUSED -1007
  20 #define DNS_RES_STATUS_SEND_FAILED -1008
  21 #define DNS_RES_STATUS_CONNECTION_FAILED -1009
  22 #define DNS_RES_STATUS_SYSTEM_ERROR -1010
  23
  24 #define RES_EXT_SUFFIX_LEN 64
  25
  26 typedef struct {
  27         unsigned        id :16;         /* query identification number */
  28 #if BYTE_ORDER == BIG_ENDIAN
  29                         /* fields in third byte */
  30         unsigned        qr: 1;          /* response flag */
  31         unsigned        opcode: 4;      /* purpose of message */
  32         unsigned        aa: 1;          /* authoritive answer */
  33         unsigned        tc: 1;          /* truncated message */
  34         unsigned        rd: 1;          /* recursion desired */
  35                         /* fields in fourth byte */
  36         unsigned        ra: 1;          /* recursion available */
  37         unsigned        unused :3;      /* unused bits (MBZ as of 4.9.3a3) */
  38         unsigned        rcode :4;       /* response code */
  39 #endif
  40 #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
  41                         /* fields in third byte */
  42         unsigned        rd :1;          /* recursion desired */
  43         unsigned        tc :1;          /* truncated message */
  44         unsigned        aa :1;          /* authoritive answer */
  45         unsigned        opcode :4;      /* purpose of message */
  46         unsigned        qr :1;          /* response flag */
  47                         /* fields in fourth byte */
  48         unsigned        rcode :4;       /* response code */
  49         unsigned        unused :3;      /* unused bits (MBZ as of 4.9.3a3) */
  50         unsigned        ra :1;          /* recursion available */
  51 #endif
  52                         /* remaining bytes */
  53         unsigned        qdcount :16;    /* number of question entries */
  54         unsigned        ancount :16;    /* number of answer entries */
  55         unsigned        nscount :16;    /* number of authority entries */
  56         unsigned        arcount :16;    /* number of resource entries */
  57 } HEADER;
  58
  59 #ifndef __res_state_ext
  60 #define __res_state_ext __res_9_res_state_ext
  61 #endif
  62
  63 struct __res_state_ext {
  64         union res_sockaddr_union nsaddrs[MAXNS];
  65         struct sort_list {
  66                 int af;
  67                 union {
  68                         struct in_addr  ina;
  69                         struct in6_addr in6a;
  70                 } addr, mask;
  71         } sort_list[MAXRESOLVSORT];
  72         char nsuffix[64];
  73         char bsuffix[64];
  74         char nsuffix2[64];
  75 };
  76
  77 #define get_nsaddr res_9_get_nsaddr
  78 struct sockaddr *get_nsaddr __P((res_state, size_t));
  79
  80 #define res_nsend_2 res_9_nsend_2
  81 int res_nsend_2(res_state, const u_char *, int, u_char *, int, struct sockaddr *, int *);
  82
  83 #define res_ourserver_p res_9_ourserver_p
  84 int res_ourserver_p(const res_state, const struct sockaddr *);
  85
  86 res_state res_state_new();
  87 void res_client_close(res_state res);
  88
  89 /*
  90  * From lookupd Thread.h.  We use this to signal threads to quit, since pthread_cancel() doesn't work.
  91  */
  92 #define ThreadStateExitRequested 4
  93
  94 /*
  95  * notification SPI
  96  */
  97 extern uint32_t notify_register_plain(const char *name, int *out_token);
  98
  99 extern int res_query_mDNSResponder(res_state statp, const char *name, int class, int type, u_char *answer, int anslen, struct sockaddr *from, uint32_t *fromlen);
 100
 101 int dns_res_once(struct sockaddr *server, struct timeval *timeout, int options, const char *name, int class, int type, u_char *res, int *reslen);
 102
 103 /*
 104  * Interrupt a thread blocked in select()
 105  */
 106 void res_interrupt_requests_enable(void);
 107 void res_interrupt_requests_disable(void);
 108 void res_interrupt_request(void *token);
 109 void *res_init_interrupt_token(void);
 110 void res_delete_interrupt_token(void *token);
 111
 112 extern void res_client_close(res_state res);
 113 extern int __res_nquery(res_state statp, const char *name, int class, int type, u_char *answer, int anslen);
 114 extern int dns_res_send(res_state statp, const u_char *buf, int buflen, u_char *ans, int *anssiz, struct sockaddr *from, int *fromlen);
 115
 116 #pragma GCC visibility pop
 117
 118 #endif