--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/ares.h	Tue Mar 18 17:55:14 2025 -0400
@@ -0,0 +1,1229 @@
+/* MIT License
+ *
+ * Copyright (c) Massachusetts Institute of Technology
+ * Copyright (c) Daniel Stenberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef ARES__H
+#define ARES__H
+
+#include "ares_version.h" /* c-ares version defines   */
+#include "ares_build.h"   /* c-ares build definitions */
+
+#if defined(_WIN32)
+#  ifndef WIN32_LEAN_AND_MEAN
+#    define WIN32_LEAN_AND_MEAN
+#  endif
+#endif
+
+#ifdef CARES_HAVE_SYS_TYPES_H
+#  include <sys/types.h>
+#endif
+
+#ifdef CARES_HAVE_SYS_SOCKET_H
+#  include <sys/socket.h>
+#endif
+
+#ifdef CARES_HAVE_SYS_SELECT_H
+#  include <sys/select.h>
+#endif
+
+#ifdef CARES_HAVE_WINSOCK2_H
+#  include <winsock2.h>
+/* To aid with linking against a static c-ares build, lets tell the microsoft
+ * compiler to pull in needed dependencies */
+#  ifdef _MSC_VER
+#    pragma comment(lib, "ws2_32")
+#    pragma comment(lib, "advapi32")
+#    pragma comment(lib, "iphlpapi")
+#  endif
+#endif
+
+#ifdef CARES_HAVE_WS2TCPIP_H
+#  include <ws2tcpip.h>
+#endif
+
+#ifdef CARES_HAVE_WINDOWS_H
+#  include <windows.h>
+#endif
+
+/* HP-UX systems version 9, 10 and 11 lack sys/select.h and so does oldish
+   libc5-based Linux systems. Only include it on system that are known to
+   require it! */
+#if defined(_AIX) || defined(__NOVELL_LIBC__) || defined(__NetBSD__) || \
+  defined(__minix) || defined(__SYMBIAN32__) || defined(__INTEGRITY) || \
+  defined(ANDROID) || defined(__ANDROID__) || defined(__OpenBSD__) ||   \
+  defined(__QNX__) || defined(__MVS__) || defined(__HAIKU__)
+#  include <sys/select.h>
+#endif
+
+#if (defined(NETWARE) && !defined(__NOVELL_LIBC__))
+#  include <sys/bsdskt.h>
+#endif
+
+#if !defined(_WIN32)
+#  include <netinet/in.h>
+#endif
+
+#ifdef WATT32
+#  include <tcp.h>
+#endif
+
+#if defined(ANDROID) || defined(__ANDROID__)
+#  include <jni.h>
+#endif
+
+typedef CARES_TYPEOF_ARES_SOCKLEN_T ares_socklen_t;
+typedef CARES_TYPEOF_ARES_SSIZE_T   ares_ssize_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+** c-ares external API function linkage decorations.
+*/
+
+#if defined(_WIN32) || defined(__CYGWIN__) || defined(__SYMBIAN32__)
+#  ifdef CARES_STATICLIB
+#    define CARES_EXTERN
+#  else
+#    ifdef CARES_BUILDING_LIBRARY
+#      define CARES_EXTERN __declspec(dllexport)
+#    else
+#      define CARES_EXTERN __declspec(dllimport)
+#    endif
+#  endif
+#else
+#  if defined(__GNUC__) && __GNUC__ >= 4
+#    define CARES_EXTERN __attribute__((visibility("default")))
+#  elif defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 900
+#    define CARES_EXTERN __attribute__((visibility("default")))
+#  elif defined(__SUNPRO_C)
+#    define CARES_EXTERN _global
+#  else
+#    define CARES_EXTERN
+#  endif
+#endif
+
+#ifdef __GNUC__
+#  define CARES_GCC_VERSION \
+    (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
+#else
+#  define CARES_GCC_VERSION 0
+#endif
+
+#ifndef __has_attribute
+#  define __has_attribute(x) 0
+#endif
+
+#ifdef CARES_NO_DEPRECATED
+#  define CARES_DEPRECATED
+#  define CARES_DEPRECATED_FOR(f)
+#else
+#  if CARES_GCC_VERSION >= 30200 || __has_attribute(__deprecated__)
+#    define CARES_DEPRECATED __attribute__((__deprecated__))
+#  else
+#    define CARES_DEPRECATED
+#  endif
+
+#  if CARES_GCC_VERSION >= 40500 || defined(__clang__)
+#    define CARES_DEPRECATED_FOR(f) \
+      __attribute__((deprecated("Use " #f " instead")))
+#  elif defined(_MSC_VER)
+#    define CARES_DEPRECATED_FOR(f) __declspec(deprecated("Use " #f " instead"))
+#  else
+#    define CARES_DEPRECATED_FOR(f) CARES_DEPRECATED
+#  endif
+#endif
+
+typedef enum {
+  ARES_SUCCESS = 0,
+
+  /* Server error codes (ARES_ENODATA indicates no relevant answer) */
+  ARES_ENODATA   = 1,
+  ARES_EFORMERR  = 2,
+  ARES_ESERVFAIL = 3,
+  ARES_ENOTFOUND = 4,
+  ARES_ENOTIMP   = 5,
+  ARES_EREFUSED  = 6,
+
+  /* Locally generated error codes */
+  ARES_EBADQUERY    = 7,
+  ARES_EBADNAME     = 8,
+  ARES_EBADFAMILY   = 9,
+  ARES_EBADRESP     = 10,
+  ARES_ECONNREFUSED = 11,
+  ARES_ETIMEOUT     = 12,
+  ARES_EOF          = 13,
+  ARES_EFILE        = 14,
+  ARES_ENOMEM       = 15,
+  ARES_EDESTRUCTION = 16,
+  ARES_EBADSTR      = 17,
+
+  /* ares_getnameinfo error codes */
+  ARES_EBADFLAGS = 18,
+
+  /* ares_getaddrinfo error codes */
+  ARES_ENONAME   = 19,
+  ARES_EBADHINTS = 20,
+
+  /* Uninitialized library error code */
+  ARES_ENOTINITIALIZED = 21, /* introduced in 1.7.0 */
+
+  /* ares_library_init error codes */
+  ARES_ELOADIPHLPAPI         = 22, /* introduced in 1.7.0 */
+  ARES_EADDRGETNETWORKPARAMS = 23, /* introduced in 1.7.0 */
+
+  /* More error codes */
+  ARES_ECANCELLED = 24, /* introduced in 1.7.0 */
+
+  /* More ares_getaddrinfo error codes */
+  ARES_ESERVICE = 25, /* ares_getaddrinfo() was passed a text service name that
+                       * is not recognized. introduced in 1.16.0 */
+
+  ARES_ENOSERVER = 26 /* No DNS servers were configured */
+} ares_status_t;
+
+typedef enum {
+  ARES_FALSE = 0,
+  ARES_TRUE  = 1
+} ares_bool_t;
+
+/*! Values for ARES_OPT_EVENT_THREAD */
+typedef enum {
+  /*! Default (best choice) event system */
+  ARES_EVSYS_DEFAULT = 0,
+  /*! Win32 IOCP/AFD_POLL event system */
+  ARES_EVSYS_WIN32 = 1,
+  /*! Linux epoll */
+  ARES_EVSYS_EPOLL = 2,
+  /*! BSD/MacOS kqueue */
+  ARES_EVSYS_KQUEUE = 3,
+  /*! POSIX poll() */
+  ARES_EVSYS_POLL = 4,
+  /*! last fallback on Unix-like systems, select() */
+  ARES_EVSYS_SELECT = 5
+} ares_evsys_t;
+
+/* Flag values */
+#define ARES_FLAG_USEVC       (1 << 0)
+#define ARES_FLAG_PRIMARY     (1 << 1)
+#define ARES_FLAG_IGNTC       (1 << 2)
+#define ARES_FLAG_NORECURSE   (1 << 3)
+#define ARES_FLAG_STAYOPEN    (1 << 4)
+#define ARES_FLAG_NOSEARCH    (1 << 5)
+#define ARES_FLAG_NOALIASES   (1 << 6)
+#define ARES_FLAG_NOCHECKRESP (1 << 7)
+#define ARES_FLAG_EDNS        (1 << 8)
+#define ARES_FLAG_NO_DFLT_SVR (1 << 9)
+#define ARES_FLAG_DNS0x20     (1 << 10)
+
+/* Option mask values */
+#define ARES_OPT_FLAGS           (1 << 0)
+#define ARES_OPT_TIMEOUT         (1 << 1)
+#define ARES_OPT_TRIES           (1 << 2)
+#define ARES_OPT_NDOTS           (1 << 3)
+#define ARES_OPT_UDP_PORT        (1 << 4)
+#define ARES_OPT_TCP_PORT        (1 << 5)
+#define ARES_OPT_SERVERS         (1 << 6)
+#define ARES_OPT_DOMAINS         (1 << 7)
+#define ARES_OPT_LOOKUPS         (1 << 8)
+#define ARES_OPT_SOCK_STATE_CB   (1 << 9)
+#define ARES_OPT_SORTLIST        (1 << 10)
+#define ARES_OPT_SOCK_SNDBUF     (1 << 11)
+#define ARES_OPT_SOCK_RCVBUF     (1 << 12)
+#define ARES_OPT_TIMEOUTMS       (1 << 13)
+#define ARES_OPT_ROTATE          (1 << 14)
+#define ARES_OPT_EDNSPSZ         (1 << 15)
+#define ARES_OPT_NOROTATE        (1 << 16)
+#define ARES_OPT_RESOLVCONF      (1 << 17)
+#define ARES_OPT_HOSTS_FILE      (1 << 18)
+#define ARES_OPT_UDP_MAX_QUERIES (1 << 19)
+#define ARES_OPT_MAXTIMEOUTMS    (1 << 20)
+#define ARES_OPT_QUERY_CACHE     (1 << 21)
+#define ARES_OPT_EVENT_THREAD    (1 << 22)
+#define ARES_OPT_SERVER_FAILOVER (1 << 23)
+
+/* Nameinfo flag values */
+#define ARES_NI_NOFQDN        (1 << 0)
+#define ARES_NI_NUMERICHOST   (1 << 1)
+#define ARES_NI_NAMEREQD      (1 << 2)
+#define ARES_NI_NUMERICSERV   (1 << 3)
+#define ARES_NI_DGRAM         (1 << 4)
+#define ARES_NI_TCP           0
+#define ARES_NI_UDP           ARES_NI_DGRAM
+#define ARES_NI_SCTP          (1 << 5)
+#define ARES_NI_DCCP          (1 << 6)
+#define ARES_NI_NUMERICSCOPE  (1 << 7)
+#define ARES_NI_LOOKUPHOST    (1 << 8)
+#define ARES_NI_LOOKUPSERVICE (1 << 9)
+/* Reserved for future use */
+#define ARES_NI_IDN                      (1 << 10)
+#define ARES_NI_IDN_ALLOW_UNASSIGNED     (1 << 11)
+#define ARES_NI_IDN_USE_STD3_ASCII_RULES (1 << 12)
+
+/* Addrinfo flag values */
+#define ARES_AI_CANONNAME   (1 << 0)
+#define ARES_AI_NUMERICHOST (1 << 1)
+#define ARES_AI_PASSIVE     (1 << 2)
+#define ARES_AI_NUMERICSERV (1 << 3)
+#define ARES_AI_V4MAPPED    (1 << 4)
+#define ARES_AI_ALL         (1 << 5)
+#define ARES_AI_ADDRCONFIG  (1 << 6)
+#define ARES_AI_NOSORT      (1 << 7)
+#define ARES_AI_ENVHOSTS    (1 << 8)
+/* Reserved for future use */
+#define ARES_AI_IDN                      (1 << 10)
+#define ARES_AI_IDN_ALLOW_UNASSIGNED     (1 << 11)
+#define ARES_AI_IDN_USE_STD3_ASCII_RULES (1 << 12)
+#define ARES_AI_CANONIDN                 (1 << 13)
+
+#define ARES_AI_MASK                                           \
+  (ARES_AI_CANONNAME | ARES_AI_NUMERICHOST | ARES_AI_PASSIVE | \
+   ARES_AI_NUMERICSERV | ARES_AI_V4MAPPED | ARES_AI_ALL | ARES_AI_ADDRCONFIG)
+#define ARES_GETSOCK_MAXNUM                       \
+  16 /* ares_getsock() can return info about this \
+        many sockets */
+#define ARES_GETSOCK_READABLE(bits, num) (bits & (1 << (num)))
+#define ARES_GETSOCK_WRITABLE(bits, num) \
+  (bits & (1 << ((num) + ARES_GETSOCK_MAXNUM)))
+
+/* c-ares library initialization flag values */
+#define ARES_LIB_INIT_NONE  (0)
+#define ARES_LIB_INIT_WIN32 (1 << 0)
+#define ARES_LIB_INIT_ALL   (ARES_LIB_INIT_WIN32)
+
+/* Server state callback flag values */
+#define ARES_SERV_STATE_UDP (1 << 0) /* Query used UDP */
+#define ARES_SERV_STATE_TCP (1 << 1) /* Query used TCP */
+
+/*
+ * Typedef our socket type
+ */
+
+#ifndef ares_socket_typedef
+#  if defined(_WIN32) && !defined(WATT32)
+typedef SOCKET ares_socket_t;
+#    define ARES_SOCKET_BAD INVALID_SOCKET
+#  else
+typedef int ares_socket_t;
+#    define ARES_SOCKET_BAD -1
+#  endif
+#  define ares_socket_typedef
+#endif /* ares_socket_typedef */
+
+typedef void (*ares_sock_state_cb)(void *data, ares_socket_t socket_fd,
+                                   int readable, int writable);
+
+struct apattern;
+
+/* Options controlling server failover behavior.
+ * The retry chance is the probability (1/N) by which we will retry a failed
+ * server instead of the best server when selecting a server to send queries
+ * to.
+ * The retry delay is the minimum time in milliseconds to wait between doing
+ * such retries (applied per-server).
+ */
+struct ares_server_failover_options {
+  unsigned short retry_chance;
+  size_t         retry_delay;
+};
+
+/* NOTE about the ares_options struct to users and developers.
+
+   This struct will remain looking like this. It will not be extended nor
+   shrunk in future releases, but all new options will be set by ares_set_*()
+   options instead of with the ares_init_options() function.
+
+   Eventually (in a galaxy far far away), all options will be settable by
+   ares_set_*() options and the ares_init_options() function will become
+   deprecated.
+
+   When new options are added to c-ares, they are not added to this
+   struct. And they are not "saved" with the ares_save_options() function but
+   instead we encourage the use of the ares_dup() function. Needless to say,
+   if you add config options to c-ares you need to make sure ares_dup()
+   duplicates this new option.
+
+ */
+struct ares_options {
+  int            flags;
+  int            timeout; /* in seconds or milliseconds, depending on options */
+  int            tries;
+  int            ndots;
+  unsigned short udp_port; /* host byte order */
+  unsigned short tcp_port; /* host byte order */
+  int            socket_send_buffer_size;
+  int            socket_receive_buffer_size;
+  struct in_addr    *servers;
+  int                nservers;
+  char             **domains;
+  int                ndomains;
+  char              *lookups;
+  ares_sock_state_cb sock_state_cb;
+  void              *sock_state_cb_data;
+  struct apattern   *sortlist;
+  int                nsort;
+  int                ednspsz;
+  char              *resolvconf_path;
+  char              *hosts_path;
+  int                udp_max_queries;
+  int                maxtimeout; /* in milliseconds */
+  unsigned int qcache_max_ttl;   /* Maximum TTL for query cache, 0=disabled */
+  ares_evsys_t evsys;
+  struct ares_server_failover_options server_failover_opts;
+};
+
+struct hostent;
+struct timeval;
+struct sockaddr;
+struct ares_channeldata;
+struct ares_addrinfo;
+struct ares_addrinfo_hints;
+
+/* Legacy typedef, don't use, you can't specify "const" */
+typedef struct ares_channeldata *ares_channel;
+
+/* Current main channel typedef */
+typedef struct ares_channeldata  ares_channel_t;
+
+/*
+ * NOTE: before c-ares 1.7.0 we would most often use the system in6_addr
+ * struct below when ares itself was built, but many apps would use this
+ * private version since the header checked a HAVE_* define for it. Starting
+ * with 1.7.0 we always declare and use our own to stop relying on the
+ * system's one.
+ */
+struct ares_in6_addr {
+  union {
+    unsigned char _S6_u8[16];
+  } _S6_un;
+};
+
+struct ares_addr {
+  int family;
+
+  union {
+    struct in_addr       addr4;
+    struct ares_in6_addr addr6;
+  } addr;
+};
+
+/* DNS record parser, writer, and helpers */
+#include "ares_dns_record.h"
+
+typedef void (*ares_callback)(void *arg, int status, int timeouts,
+                              unsigned char *abuf, int alen);
+
+typedef void (*ares_callback_dnsrec)(void *arg, ares_status_t status,
+                                     size_t                   timeouts,
+                                     const ares_dns_record_t *dnsrec);
+
+typedef void (*ares_host_callback)(void *arg, int status, int timeouts,
+                                   struct hostent *hostent);
+
+typedef void (*ares_nameinfo_callback)(void *arg, int status, int timeouts,
+                                       char *node, char *service);
+
+typedef int (*ares_sock_create_callback)(ares_socket_t socket_fd, int type,
+                                         void *data);
+
+typedef int (*ares_sock_config_callback)(ares_socket_t socket_fd, int type,
+                                         void *data);
+
+typedef void (*ares_addrinfo_callback)(void *arg, int status, int timeouts,
+                                       struct ares_addrinfo *res);
+
+typedef void (*ares_server_state_callback)(const char *server_string,
+                                           ares_bool_t success, int flags,
+                                           void *data);
+
+typedef void (*ares_pending_write_cb)(void *data);
+
+CARES_EXTERN int ares_library_init(int flags);
+
+CARES_EXTERN int ares_library_init_mem(int flags, void *(*amalloc)(size_t size),
+                                       void (*afree)(void *ptr),
+                                       void *(*arealloc)(void  *ptr,
+                                                         size_t size));
+
+#if defined(ANDROID) || defined(__ANDROID__)
+CARES_EXTERN void ares_library_init_jvm(JavaVM *jvm);
+CARES_EXTERN int  ares_library_init_android(jobject connectivity_manager);
+CARES_EXTERN int  ares_library_android_initialized(void);
+#endif
+
+#define CARES_HAVE_ARES_LIBRARY_INIT    1
+#define CARES_HAVE_ARES_LIBRARY_CLEANUP 1
+
+CARES_EXTERN int         ares_library_initialized(void);
+
+CARES_EXTERN void        ares_library_cleanup(void);
+
+CARES_EXTERN const char *ares_version(int *version);
+
+CARES_EXTERN             CARES_DEPRECATED_FOR(ares_init_options) int ares_init(
+  ares_channel_t **channelptr);
+
+CARES_EXTERN int  ares_init_options(ares_channel_t           **channelptr,
+                                    const struct ares_options *options,
+                                    int                        optmask);
+
+CARES_EXTERN int  ares_save_options(const ares_channel_t *channel,
+                                    struct ares_options *options, int *optmask);
+
+CARES_EXTERN void ares_destroy_options(struct ares_options *options);
+
+CARES_EXTERN int  ares_dup(ares_channel_t **dest, const ares_channel_t *src);
+
+CARES_EXTERN ares_status_t ares_reinit(ares_channel_t *channel);
+
+CARES_EXTERN void          ares_destroy(ares_channel_t *channel);
+
+CARES_EXTERN void          ares_cancel(ares_channel_t *channel);
+
+/* These next 3 configure local binding for the out-going socket
+ * connection.  Use these to specify source IP and/or network device
+ * on multi-homed systems.
+ */
+CARES_EXTERN void          ares_set_local_ip4(ares_channel_t *channel,
+                                              unsigned int    local_ip);
+
+/* local_ip6 should be 16 bytes in length */
+CARES_EXTERN void          ares_set_local_ip6(ares_channel_t      *channel,
+                                              const unsigned char *local_ip6);
+
+/* local_dev_name should be null terminated. */
+CARES_EXTERN void          ares_set_local_dev(ares_channel_t *channel,
+                                              const char     *local_dev_name);
+
+CARES_EXTERN void          ares_set_socket_callback(ares_channel_t           *channel,
+                                                    ares_sock_create_callback callback,
+                                                    void                     *user_data);
+
+CARES_EXTERN void          ares_set_socket_configure_callback(
+           ares_channel_t *channel, ares_sock_config_callback callback, void *user_data);
+
+CARES_EXTERN void
+                  ares_set_server_state_callback(ares_channel_t            *channel,
+                                                 ares_server_state_callback callback,
+                                                 void                      *user_data);
+
+CARES_EXTERN void ares_set_pending_write_cb(ares_channel_t       *channel,
+                                            ares_pending_write_cb callback,
+                                            void                 *user_data);
+
+CARES_EXTERN void ares_process_pending_write(ares_channel_t *channel);
+
+CARES_EXTERN int  ares_set_sortlist(ares_channel_t *channel,
+                                    const char     *sortstr);
+
+CARES_EXTERN void ares_getaddrinfo(ares_channel_t *channel, const char *node,
+                                   const char                       *service,
+                                   const struct ares_addrinfo_hints *hints,
+                                   ares_addrinfo_callback callback, void *arg);
+
+CARES_EXTERN void ares_freeaddrinfo(struct ares_addrinfo *ai);
+
+/*
+ * Virtual function set to have user-managed socket IO.
+ * Note that all functions need to be defined, and when
+ * set, the library will not do any bind nor set any
+ * socket options, assuming the client handles these
+ * through either socket creation or the
+ * ares_sock_config_callback call.
+ */
+struct iovec;
+
+struct ares_socket_functions {
+  ares_socket_t (*asocket)(int, int, int, void *);
+  int (*aclose)(ares_socket_t, void *);
+  int (*aconnect)(ares_socket_t, const struct sockaddr *, ares_socklen_t,
+                  void *);
+  ares_ssize_t (*arecvfrom)(ares_socket_t, void *, size_t, int,
+                            struct sockaddr *, ares_socklen_t *, void *);
+  ares_ssize_t (*asendv)(ares_socket_t, const struct iovec *, int, void *);
+};
+
+CARES_EXTERN CARES_DEPRECATED_FOR(
+  ares_set_socket_functions_ex) void ares_set_socket_functions(ares_channel_t
+                                                                 *channel,
+                                                               const struct
+                                                               ares_socket_functions
+                                                                    *funcs,
+                                                               void *user_data);
+
+/*! Flags defining behavior of socket functions */
+typedef enum {
+  /*! Strongly recommended to create sockets as non-blocking and set this
+   *  flag */
+  ARES_SOCKFUNC_FLAG_NONBLOCKING = 1 << 0
+} ares_sockfunc_flags_t;
+
+/*! Socket options in request to asetsockopt() in struct
+ *  ares_socket_functions_ex */
+typedef enum {
+  /*! Set the send buffer size. Value is a pointer to an int. (SO_SNDBUF) */
+  ARES_SOCKET_OPT_SENDBUF_SIZE,
+  /*! Set the recv buffer size. Value is a pointer to an int. (SO_RCVBUF) */
+  ARES_SOCKET_OPT_RECVBUF_SIZE,
+  /*! Set the network interface to use as the source for communication.
+   *  Value is a C string. (SO_BINDTODEVICE) */
+  ARES_SOCKET_OPT_BIND_DEVICE,
+  /*! Enable TCP Fast Open.  Value is a pointer to an ares_bool_t.  On some
+   *  systems this could be a no-op if it is known it is on by default and
+   *  return success.  Other systems may be a no-op if known the system does
+   *  not support the feature and returns failure with errno set to ENOSYS or
+   *  WSASetLastError(WSAEOPNOTSUPP).
+   */
+  ARES_SOCKET_OPT_TCP_FASTOPEN
+} ares_socket_opt_t;
+
+/*! Flags for behavior during connect */
+typedef enum {
+  /*! Connect using TCP Fast Open */
+  ARES_SOCKET_CONN_TCP_FASTOPEN = 1 << 0
+} ares_socket_connect_flags_t;
+
+/*! Flags for behavior during bind */
+typedef enum {
+  /*! Bind is for a TCP connection */
+  ARES_SOCKET_BIND_TCP = 1 << 0,
+  /*! Bind is for a client connection, not server */
+  ARES_SOCKET_BIND_CLIENT = 1 << 1
+} ares_socket_bind_flags_t;
+
+/*! Socket functions to call rather than using OS-native functions */
+struct ares_socket_functions_ex {
+  /*! ABI Version: must be "1" */
+  unsigned int version;
+
+  /*! Flags indicating behavior of the subsystem. One or more
+   * ares_sockfunc_flags_t  */
+  unsigned int flags;
+
+  /*! REQUIRED. Create a new socket file descriptor.  The file descriptor must
+   * be opened in non-blocking mode (so that reads and writes never block).
+   * Recommended other options would be to disable signals on write errors
+   * (SO_NOSIGPIPE), Disable the Nagle algorithm on SOCK_STREAM (TCP_NODELAY),
+   * and to automatically close file descriptors on exec (FD_CLOEXEC).
+   *
+   *  \param[in] domain      Socket domain. Valid values are AF_INET, AF_INET6.
+   *  \param[in] type       Socket type. Valid values are SOCK_STREAM (tcp) and
+   *                        SOCK_DGRAM (udp).
+   *  \param[in] protocol   In general this should be ignored, may be passed as
+   *                        0 (use as default for type), or may be IPPROTO_UDP
+   *                        or IPPROTO_TCP.
+   *  \param[in] user_data  Pointer provided to ares_set_socket_functions_ex().
+   *  \return ARES_SOCKET_BAD on error, or socket file descriptor on success.
+   *          On error, it is expected to set errno (or WSASetLastError()) to an
+   *          appropriate reason code such as EAFNOSUPPORT / WSAAFNOSUPPORT. */
+  ares_socket_t (*asocket)(int domain, int type, int protocol, void *user_data);
+
+  /*! REQUIRED. Close a socket file descriptor.
+   *  \param[in] sock      Socket file descriptor returned from asocket.
+   *  \param[in] user_data Pointer provided to ares_set_socket_functions_ex().
+   *  \return 0 on success.  On failure, should set errno (or WSASetLastError)
+   *          to an appropriate code such as EBADF / WSAEBADF */
+  int (*aclose)(ares_socket_t sock, void *user_data);
+
+
+  /*! REQUIRED. Set socket option.  This shares a similar syntax to the BSD
+   *  setsockopt() call, however we use our own options.  The value is typically
+   *  a pointer to the desired value and each option has its own data type it
+   *  will express in the documentation.
+   *
+   * \param[in] sock         Socket file descriptor returned from asocket.
+   * \param[in] opt          Option to set.
+   * \param[in] val          Pointer to value for option.
+   * \param[in] val_size     Size of value.
+   * \param[in] user_data    Pointer provided to
+   * ares_set_socket_functions_ex().
+   * \return Return 0 on success, otherwise -1 should be returned with an
+   *         appropriate errno (or WSASetLastError()) set.  If error is ENOSYS /
+   *         WSAEOPNOTSUPP an error will not be propagated as it will take it
+   *         to mean it is an intentional decision to not support the feature.
+   */
+  int (*asetsockopt)(ares_socket_t sock, ares_socket_opt_t opt, const void *val,
+                     ares_socklen_t val_size, void *user_data);
+
+  /*! REQUIRED. Connect to the remote using the supplied address.  For UDP
+   * sockets this will bind the file descriptor to only send and receive packets
+   * from the remote address provided.
+   *
+   *  \param[in] sock         Socket file descriptor returned from asocket.
+   *  \param[in] address      Address to connect to
+   *  \param[in] address_len  Size of address structure passed
+   *  \param[in] flags        One or more ares_socket_connect_flags_t
+   *  \param[in] user_data    Pointer provided to
+   * ares_set_socket_functions_ex().
+   *  \return Return 0 upon successful establishement, otherwise -1 should be
+   *          returned with an appropriate errno (or WSASetLastError()) set.  It
+   * is generally expected that most TCP connections (not using TCP Fast Open)
+   * will return -1 with an error of EINPROGRESS / WSAEINPROGRESS due to the
+   * non-blocking nature of the connection.  It is then the responsibility of
+   * the implementation to notify of writability on the socket to indicate the
+   * connection has succeeded (or readability on failure to retrieve the
+   * appropriate error).
+   */
+  int (*aconnect)(ares_socket_t sock, const struct sockaddr *address,
+                  ares_socklen_t address_len, unsigned int flags,
+                  void *user_data);
+
+  /*! REQUIRED. Attempt to read data from the remote.
+   *
+   *  \param[in]     sock        Socket file descriptor returned from asocket.
+   *  \param[in,out] buffer      Allocated buffer to place data read from
+   * socket.
+   *  \param[in]     length      Size of buffer
+   *  \param[in]     flags       Unused, always 0.
+   *  \param[in,out] address     Buffer to hold address data was received from.
+   *                             May be NULL if address not desired.
+   *  \param[in,out] address_len Input size of address buffer, output actual
+   *                             written size. Must be NULL if address is NULL.
+   *  \param[in]     user_data   Pointer provided to
+   * ares_set_socket_functions_ex().
+   *  \return -1 on error with appropriate errno (or WSASetLastError()) set,
+   * such as EWOULDBLOCK / EAGAIN / WSAEWOULDBLOCK, or ECONNRESET /
+   * WSAECONNRESET.
+   */
+  ares_ssize_t (*arecvfrom)(ares_socket_t sock, void *buffer, size_t length,
+                            int flags, struct sockaddr *address,
+                            ares_socklen_t *address_len, void *user_data);
+
+  /*! REQUIRED. Attempt to send data to the remote.  Optional address may be
+   * specified which may be useful on unbound UDP sockets (though currently not
+   * used), and TCP FastOpen where the connection is delayed until first write.
+   *
+   *  \param[in]     sock        Socket file descriptor returned from asocket.
+   *  \param[in]     buffer      Containing data to place onto wire.
+   *  \param[in]     length      Size of buffer
+   *  \param[in]     flags       Flags for writing.  Currently only used flag is
+   *                             MSG_NOSIGNAL if the host OS has such a flag. In
+   *                             general flags can be ignored.
+   *  \param[in]     address     Buffer containing address to send data to.  May
+   *                             be NULL.
+   *  \param[in,out] address_len Size of address buffer.  Must be 0 if address
+   *                             is NULL.
+   *  \param[in]     user_data   Pointer provided to
+   * ares_set_socket_functions_ex().
+   *  \return Number of bytes written. -1 on error with appropriate errno (or
+   * WSASetLastError()) set.
+   */
+  ares_ssize_t (*asendto)(ares_socket_t sock, const void *buffer, size_t length,
+                          int flags, const struct sockaddr *address,
+                          ares_socklen_t address_len, void *user_data);
+
+  /*! Optional. Retrieve the local address of the socket.
+   *
+   *  \param[in]     sock        Socket file descriptor returned from asocket
+   *  \param[in,out] address     Buffer to hold address
+   *  \param[in,out] address_len Size of address buffer on input, written size
+   * on output.
+   *  \param[in]     user_data   Pointer provided to
+   * ares_set_socket_functions_ex().
+   *  \return 0 on success. -1 on error with an appropriate errno (or
+   * WSASetLastError()) set.
+   */
+  int (*agetsockname)(ares_socket_t sock, struct sockaddr *address,
+                      ares_socklen_t *address_len, void *user_data);
+
+  /*! Optional. Bind the socket to an address.  This can be used for client
+   *  connections to bind the source address for packets before connect, or
+   *  for server connections to bind to an address and port before listening.
+   *  Currently c-ares only supports client connections.
+   *
+   *  \param[in] sock        Socket file descriptor returned from asocket
+   *  \param[in] flags       ares_socket_bind_flags_t flags.
+   *  \param[in] address     Buffer containing address.
+   *  \param[in] address_len Size of address buffer.
+   *  \param[in] user_data   Pointer provided to
+   * ares_set_socket_functions_ex().
+   *  \return 0 on success. -1 on error with an appropriate errno (or
+   * WSASetLastError()) set.
+   */
+  int (*abind)(ares_socket_t sock, unsigned int flags,
+               const struct sockaddr *address, socklen_t address_len,
+               void *user_data);
+
+  /* Optional. Convert an interface name into the interface index.  If this
+   * callback is not specified, then IPv6 Link-Local DNS servers cannot be used.
+   *
+   * \param[in] ifname  Interface Name as NULL-terminated string.
+   * \param[in] user_data Pointer provided to
+   * ares_set_socket_functions_ex().
+   * \return 0 on failure, otherwise interface index.
+   */
+  unsigned int (*aif_nametoindex)(const char *ifname, void *user_data);
+
+  /* Optional. Convert an interface index into the interface name.  If this
+   * callback is not specified, then IPv6 Link-Local DNS servers cannot be used.
+   *
+   * \param[in] ifindex        Interface index, must be > 0
+   * \param[in] ifname_buf     Buffer to hold interface name. Must be at least
+   *                           IFNAMSIZ in length or 32 bytes if IFNAMSIZ isn't
+   *                           defined.
+   * \param[in] ifname_buf_len Size of ifname_buf for verification.
+   * \param[in] user_data      Pointer provided to
+   * ares_set_socket_functions_ex().
+   * \return NULL on failure, otherwise pointer to provided ifname_buf
+   */
+  const char *(*aif_indextoname)(unsigned int ifindex, char *ifname_buf,
+                                 size_t ifname_buf_len, void *user_data);
+};
+
+/*! Override the native socket functions for the OS with the provided set.
+ *  An optional user data thunk may be specified which will be passed to
+ *  each registered callback.  Replaces ares_set_socket_functions().
+ *
+ *  \param[in] channel   An initialized c-ares channel.
+ *  \param[in] funcs     Structure registering the implementations for the
+ *                       various functions.  See the structure definition.
+ *                       This will be duplicated and does not need to exist
+ *                       past the life of this call.
+ *  \param[in] user_data User data thunk which will be passed to each call of
+ *                       the registered callbacks.
+ *  \return ARES_SUCCESS on success, or another error code such as ARES_EFORMERR
+ *          on misuse.
+ */
+CARES_EXTERN ares_status_t ares_set_socket_functions_ex(
+  ares_channel_t *channel, const struct ares_socket_functions_ex *funcs,
+  void *user_data);
+
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_send_dnsrec) void ares_send(
+  ares_channel_t *channel, const unsigned char *qbuf, int qlen,
+  ares_callback callback, void *arg);
+
+/*! Send a DNS query as an ares_dns_record_t with a callback containing the
+ *  parsed DNS record.
+ *
+ *  \param[in]  channel  Pointer to channel on which queries will be sent.
+ *  \param[in]  dnsrec   DNS Record to send
+ *  \param[in]  callback Callback function invoked on completion or failure of
+ *                       the query sequence.
+ *  \param[in]  arg      Additional argument passed to the callback function.
+ *  \param[out] qid      Query ID
+ *  \return One of the c-ares status codes.
+ */
+CARES_EXTERN ares_status_t ares_send_dnsrec(ares_channel_t          *channel,
+                                            const ares_dns_record_t *dnsrec,
+                                            ares_callback_dnsrec     callback,
+                                            void *arg, unsigned short *qid);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_query_dnsrec) void ares_query(
+  ares_channel_t *channel, const char *name, int dnsclass, int type,
+  ares_callback callback, void *arg);
+
+/*! Perform a DNS query with a callback containing the parsed DNS record.
+ *
+ *  \param[in]  channel  Pointer to channel on which queries will be sent.
+ *  \param[in]  name     Query name
+ *  \param[in]  dnsclass DNS Class
+ *  \param[in]  type     DNS Record Type
+ *  \param[in]  callback Callback function invoked on completion or failure of
+ *                       the query sequence.
+ *  \param[in]  arg      Additional argument passed to the callback function.
+ *  \param[out] qid      Query ID
+ *  \return One of the c-ares status codes.
+ */
+CARES_EXTERN ares_status_t ares_query_dnsrec(ares_channel_t      *channel,
+                                             const char          *name,
+                                             ares_dns_class_t     dnsclass,
+                                             ares_dns_rec_type_t  type,
+                                             ares_callback_dnsrec callback,
+                                             void *arg, unsigned short *qid);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_search_dnsrec) void ares_search(
+  ares_channel_t *channel, const char *name, int dnsclass, int type,
+  ares_callback callback, void *arg);
+
+/*! Search for a complete DNS message.
+ *
+ *  \param[in] channel  Pointer to channel on which queries will be sent.
+ *  \param[in] dnsrec   Pointer to initialized and filled DNS record object.
+ *  \param[in] callback Callback function invoked on completion or failure of
+ *                      the query sequence.
+ *  \param[in] arg      Additional argument passed to the callback function.
+ *  \return One of the c-ares status codes.  In all cases, except
+ *          ARES_EFORMERR due to misuse, this error code will also be sent
+ *          to the provided callback.
+ */
+CARES_EXTERN ares_status_t ares_search_dnsrec(ares_channel_t          *channel,
+                                              const ares_dns_record_t *dnsrec,
+                                              ares_callback_dnsrec     callback,
+                                              void                    *arg);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_getaddrinfo) void ares_gethostbyname(
+  ares_channel_t *channel, const char *name, int family,
+  ares_host_callback callback, void *arg);
+
+CARES_EXTERN int  ares_gethostbyname_file(ares_channel_t *channel,
+                                          const char *name, int family,
+                                          struct hostent **host);
+
+CARES_EXTERN void ares_gethostbyaddr(ares_channel_t *channel, const void *addr,
+                                     int addrlen, int family,
+                                     ares_host_callback callback, void *arg);
+
+CARES_EXTERN void ares_getnameinfo(ares_channel_t        *channel,
+                                   const struct sockaddr *sa,
+                                   ares_socklen_t salen, int flags,
+                                   ares_nameinfo_callback callback, void *arg);
+
+CARES_EXTERN      CARES_DEPRECATED_FOR(
+  ARES_OPT_EVENT_THREAD or
+  ARES_OPT_SOCK_STATE_CB) int ares_fds(const ares_channel_t *channel,
+                                            fd_set *read_fds, fd_set *write_fds);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(
+  ARES_OPT_EVENT_THREAD or
+  ARES_OPT_SOCK_STATE_CB) int ares_getsock(const ares_channel_t *channel,
+                                           ares_socket_t *socks, int numsocks);
+
+CARES_EXTERN struct timeval *ares_timeout(const ares_channel_t *channel,
+                                          struct timeval       *maxtv,
+                                          struct timeval       *tv);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_process_fds) void ares_process(
+  ares_channel_t *channel, fd_set *read_fds, fd_set *write_fds);
+
+/*! Events used by ares_fd_events_t */
+typedef enum {
+  ARES_FD_EVENT_NONE  = 0,      /*!< No events */
+  ARES_FD_EVENT_READ  = 1 << 0, /*!< Read event (including disconnect/error) */
+  ARES_FD_EVENT_WRITE = 1 << 1  /*!< Write event */
+} ares_fd_eventflag_t;
+
+/*! Type holding a file descriptor and mask of events, used by
+ *  ares_process_fds() */
+typedef struct {
+  ares_socket_t fd;     /*!< File descriptor */
+  unsigned int  events; /*!< Mask of ares_fd_eventflag_t */
+} ares_fd_events_t;
+
+/*! Flags used by ares_process_fds() */
+typedef enum {
+  ARES_PROCESS_FLAG_NONE        = 0,     /*!< No flag value */
+  ARES_PROCESS_FLAG_SKIP_NON_FD = 1 << 0 /*!< skip any processing unrelated to
+                                          *   the file descriptor events passed
+                                          *    in */
+} ares_process_flag_t;
+
+/*! Process events on multiple file descriptors based on the event mask
+ *  associated with each file descriptor.  Recommended over calling
+ *  ares_process_fd() multiple times since it would trigger additional logic
+ *  such as timeout processing on each call.
+ *
+ *  \param[in] channel  Initialized ares channel
+ *  \param[in] events   Array of file descriptors with events.  May be NULL if
+ *                      no events, but may have timeouts to process.
+ *  \param[in] nevents  Number of elements in the events array.  May be 0 if
+ *                      no events, but may have timeouts to process.
+ *  \param[in] flags    Flags to alter behavior of the process command.
+ *  \return ARES_ENOMEM on out of memory, ARES_EFORMERR on misuse,
+ *          otherwise ARES_SUCCESS
+ */
+CARES_EXTERN ares_status_t ares_process_fds(ares_channel_t         *channel,
+                                            const ares_fd_events_t *events,
+                                            size_t nevents, unsigned int flags);
+
+CARES_EXTERN void          ares_process_fd(ares_channel_t *channel,
+                                           ares_socket_t   read_fd,
+                                           ares_socket_t   write_fd);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_record_create) int ares_create_query(
+  const char *name, int dnsclass, int type, unsigned short id, int rd,
+  unsigned char **buf, int *buflen, int max_udp_size);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_record_create) int ares_mkquery(
+  const char *name, int dnsclass, int type, unsigned short id, int rd,
+  unsigned char **buf, int *buflen);
+
+CARES_EXTERN int ares_expand_name(const unsigned char *encoded,
+                                  const unsigned char *abuf, int alen, char **s,
+                                  long *enclen);
+
+CARES_EXTERN int ares_expand_string(const unsigned char *encoded,
+                                    const unsigned char *abuf, int alen,
+                                    unsigned char **s, long *enclen);
+
+struct ares_addrttl {
+  struct in_addr ipaddr;
+  int            ttl;
+};
+
+struct ares_addr6ttl {
+  struct ares_in6_addr ip6addr;
+  int                  ttl;
+};
+
+struct ares_caa_reply {
+  struct ares_caa_reply *next;
+  int                    critical;
+  unsigned char         *property;
+  size_t                 plength; /* plength excludes null termination */
+  unsigned char         *value;
+  size_t                 length;  /* length excludes null termination */
+};
+
+struct ares_srv_reply {
+  struct ares_srv_reply *next;
+  char                  *host;
+  unsigned short         priority;
+  unsigned short         weight;
+  unsigned short         port;
+};
+
+struct ares_mx_reply {
+  struct ares_mx_reply *next;
+  char                 *host;
+  unsigned short        priority;
+};
+
+struct ares_txt_reply {
+  struct ares_txt_reply *next;
+  unsigned char         *txt;
+  size_t                 length; /* length excludes null termination */
+};
+
+/* NOTE: This structure is a superset of ares_txt_reply
+ */
+struct ares_txt_ext {
+  struct ares_txt_ext *next;
+  unsigned char       *txt;
+  size_t               length;
+  /* 1 - if start of new record
+   * 0 - if a chunk in the same record */
+  unsigned char        record_start;
+};
+
+struct ares_naptr_reply {
+  struct ares_naptr_reply *next;
+  unsigned char           *flags;
+  unsigned char           *service;
+  unsigned char           *regexp;
+  char                    *replacement;
+  unsigned short           order;
+  unsigned short           preference;
+};
+
+struct ares_soa_reply {
+  char        *nsname;
+  char        *hostmaster;
+  unsigned int serial;
+  unsigned int refresh;
+  unsigned int retry;
+  unsigned int expire;
+  unsigned int minttl;
+};
+
+struct ares_uri_reply {
+  struct ares_uri_reply *next;
+  unsigned short         priority;
+  unsigned short         weight;
+  char                  *uri;
+  int                    ttl;
+};
+
+/*
+ * Similar to addrinfo, but with extra ttl and missing canonname.
+ */
+struct ares_addrinfo_node {
+  int                        ai_ttl;
+  int                        ai_flags;
+  int                        ai_family;
+  int                        ai_socktype;
+  int                        ai_protocol;
+  ares_socklen_t             ai_addrlen;
+  struct sockaddr           *ai_addr;
+  struct ares_addrinfo_node *ai_next;
+};
+
+/*
+ * alias - label of the resource record.
+ * name - value (canonical name) of the resource record.
+ * See RFC2181 10.1.1. CNAME terminology.
+ */
+struct ares_addrinfo_cname {
+  int                         ttl;
+  char                       *alias;
+  char                       *name;
+  struct ares_addrinfo_cname *next;
+};
+
+struct ares_addrinfo {
+  struct ares_addrinfo_cname *cnames;
+  struct ares_addrinfo_node  *nodes;
+  char                       *name;
+};
+
+struct ares_addrinfo_hints {
+  int ai_flags;
+  int ai_family;
+  int ai_socktype;
+  int ai_protocol;
+};
+
+/*
+** Parse the buffer, starting at *abuf and of length alen bytes, previously
+** obtained from an ares_search call.  Put the results in *host, if nonnull.
+** Also, if addrttls is nonnull, put up to *naddrttls IPv4 addresses along with
+** their TTLs in that array, and set *naddrttls to the number of addresses
+** so written.
+*/
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_a_reply(
+  const unsigned char *abuf, int alen, struct hostent **host,
+  struct ares_addrttl *addrttls, int *naddrttls);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_aaaa_reply(
+  const unsigned char *abuf, int alen, struct hostent **host,
+  struct ares_addr6ttl *addrttls, int *naddrttls);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_caa_reply(
+  const unsigned char *abuf, int alen, struct ares_caa_reply **caa_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_ptr_reply(
+  const unsigned char *abuf, int alen, const void *addr, int addrlen,
+  int family, struct hostent **host);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_ns_reply(
+  const unsigned char *abuf, int alen, struct hostent **host);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_srv_reply(
+  const unsigned char *abuf, int alen, struct ares_srv_reply **srv_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_mx_reply(
+  const unsigned char *abuf, int alen, struct ares_mx_reply **mx_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_txt_reply(
+  const unsigned char *abuf, int alen, struct ares_txt_reply **txt_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_txt_reply_ext(
+  const unsigned char *abuf, int alen, struct ares_txt_ext **txt_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_naptr_reply(
+  const unsigned char *abuf, int alen, struct ares_naptr_reply **naptr_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_soa_reply(
+  const unsigned char *abuf, int alen, struct ares_soa_reply **soa_out);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_dns_parse) int ares_parse_uri_reply(
+  const unsigned char *abuf, int alen, struct ares_uri_reply **uri_out);
+
+CARES_EXTERN void        ares_free_string(void *str);
+
+CARES_EXTERN void        ares_free_hostent(struct hostent *host);
+
+CARES_EXTERN void        ares_free_data(void *dataptr);
+
+CARES_EXTERN const char *ares_strerror(int code);
+
+struct ares_addr_node {
+  struct ares_addr_node *next;
+  int                    family;
+
+  union {
+    struct in_addr       addr4;
+    struct ares_in6_addr addr6;
+  } addr;
+};
+
+struct ares_addr_port_node {
+  struct ares_addr_port_node *next;
+  int                         family;
+
+  union {
+    struct in_addr       addr4;
+    struct ares_in6_addr addr6;
+  } addr;
+
+  int udp_port;
+  int tcp_port;
+};
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_set_servers_csv) int ares_set_servers(
+  ares_channel_t *channel, const struct ares_addr_node *servers);
+
+CARES_EXTERN
+CARES_DEPRECATED_FOR(ares_set_servers_ports_csv)
+int                ares_set_servers_ports(ares_channel_t                   *channel,
+                                          const struct ares_addr_port_node *servers);
+
+/* Incoming string format: host[:port][,host[:port]]... */
+CARES_EXTERN int   ares_set_servers_csv(ares_channel_t *channel,
+                                        const char     *servers);
+CARES_EXTERN int   ares_set_servers_ports_csv(ares_channel_t *channel,
+                                              const char     *servers);
+CARES_EXTERN char *ares_get_servers_csv(const ares_channel_t *channel);
+
+CARES_EXTERN CARES_DEPRECATED_FOR(ares_get_servers_csv) int ares_get_servers(
+  const ares_channel_t *channel, struct ares_addr_node **servers);
+
+CARES_EXTERN
+CARES_DEPRECATED_FOR(ares_get_servers_csv)
+int                        ares_get_servers_ports(const ares_channel_t        *channel,
+                                                  struct ares_addr_port_node **servers);
+
+CARES_EXTERN const char   *ares_inet_ntop(int af, const void *src, char *dst,
+                                          ares_socklen_t size);
+
+CARES_EXTERN int           ares_inet_pton(int af, const char *src, void *dst);
+
+/*! Whether or not the c-ares library was built with threadsafety
+ *
+ *  \return ARES_TRUE if built with threadsafety, ARES_FALSE if not
+ */
+CARES_EXTERN ares_bool_t   ares_threadsafety(void);
+
+
+/*! Block until notified that there are no longer any queries in queue, or
+ *  the specified timeout has expired.
+ *
+ *  \param[in] channel    Initialized ares channel
+ *  \param[in] timeout_ms Number of milliseconds to wait for the queue to be
+ *                        empty. -1 for Infinite.
+ *  \return ARES_ENOTIMP if not built with threading support, ARES_ETIMEOUT
+ *          if requested timeout expires, ARES_SUCCESS when queue is empty.
+ */
+CARES_EXTERN ares_status_t ares_queue_wait_empty(ares_channel_t *channel,
+                                                 int             timeout_ms);
+
+
+/*! Retrieve the total number of active queries pending answers from servers.
+ *  Some c-ares requests may spawn multiple queries, such as ares_getaddrinfo()
+ *  when using AF_UNSPEC, which will be reflected in this number.
+ *
+ *  \param[in] channel Initialized ares channel
+ *  \return Number of active queries to servers
+ */
+CARES_EXTERN size_t ares_queue_active_queries(const ares_channel_t *channel);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ARES__H */