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libcares/ares_private.h  view on Meta::CPAN

  /* Query status */
  int try_count; /* Number of times we tried this query already. */
  int server; /* Server this query has last been sent to. */
  struct query_server_info *server_info;   /* per-server state */
  int using_tcp;
  int error_status;
  int timeouts; /* number of timeouts we saw for this request */
};

/* Per-server state for a query */
struct query_server_info {
  int skip_server;  /* should we skip server, due to errors, etc? */
  int tcp_connection_generation;  /* into which TCP connection did we send? */
};

/* An IP address pattern; matches an IP address X if X & mask == addr */
#define PATTERN_MASK 0x1
#define PATTERN_CIDR 0x2

struct apattern {
  union
  {
    struct in_addr       addr4;
    struct ares_in6_addr addr6;
  } addr;
  union
  {
    struct in_addr       addr4;
    struct ares_in6_addr addr6;
    unsigned short       bits;
  } mask;
  int family;
  unsigned short type;
};

typedef struct rc4_key
{
  unsigned char state[256];
  unsigned char x;
  unsigned char y;
} rc4_key;

struct ares_channeldata {
  /* Configuration data */
  int flags;
  int timeout; /* in milliseconds */
  int tries;
  int ndots;
  int rotate; /* if true, all servers specified are used */
  int udp_port; /* stored in network order */
  int tcp_port; /* stored in network order */
  int socket_send_buffer_size;
  int socket_receive_buffer_size;
  char **domains;
  int ndomains;
  struct apattern *sortlist;
  int nsort;
  char *lookups;
  int ednspsz;

  /* For binding to local devices and/or IP addresses.  Leave
   * them null/zero for no binding.
   */
  char local_dev_name[32];
  unsigned int local_ip4;
  unsigned char local_ip6[16];

  int optmask; /* the option bitfield passed in at init time */

  /* Server addresses and communications state */
  struct server_state *servers;
  int nservers;

  /* ID to use for next query */
  unsigned short next_id;
  /* key to use when generating new ids */
  rc4_key id_key;

  /* Generation number to use for the next TCP socket open/close */
  int tcp_connection_generation;

  /* The time at which we last called process_timeouts(). Uses integer seconds
     just to draw the line somewhere. */
  time_t last_timeout_processed;

  /* Last server we sent a query to. */
  int last_server;

  /* Circular, doubly-linked list of queries, bucketed various ways.... */
  /* All active queries in a single list: */
  struct list_node all_queries;
  /* Queries bucketed by qid, for quickly dispatching DNS responses: */
#define ARES_QID_TABLE_SIZE 2048
  struct list_node queries_by_qid[ARES_QID_TABLE_SIZE];
  /* Queries bucketed by timeout, for quickly handling timeouts: */
#define ARES_TIMEOUT_TABLE_SIZE 1024
  struct list_node queries_by_timeout[ARES_TIMEOUT_TABLE_SIZE];

  ares_sock_state_cb sock_state_cb;
  void *sock_state_cb_data;

  ares_sock_create_callback sock_create_cb;
  void *sock_create_cb_data;

  ares_sock_config_callback sock_config_cb;
  void *sock_config_cb_data;

  const struct ares_socket_functions * sock_funcs;
  void *sock_func_cb_data;

  /* Path for resolv.conf file, configurable via ares_options */
  char *resolvconf_path;
};

/* Does the domain end in ".onion" or ".onion."? Case-insensitive. */
int ares__is_onion_domain(const char *name);

/* Memory management functions */
extern void *(*ares_malloc)(size_t size);
extern void *(*ares_realloc)(void *ptr, size_t size);
extern void (*ares_free)(void *ptr);