+++ /dev/null
-/*
- * Copyright (c) 2006-2007 Niels Provos <provos@citi.umich.edu>
- * Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-/*
- * The original DNS code is due to Adam Langley with heavy
- * modifications by Nick Mathewson. Adam put his DNS software in the
- * public domain. You can find his original copyright below. Please,
- * aware that the code as part of Libevent is governed by the 3-clause
- * BSD license above.
- *
- * This software is Public Domain. To view a copy of the public domain dedication,
- * visit http://creativecommons.org/licenses/publicdomain/ or send a letter to
- * Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.
- *
- * I ask and expect, but do not require, that all derivative works contain an
- * attribution similar to:
- * Parts developed by Adam Langley <agl@imperialviolet.org>
- *
- * You may wish to replace the word "Parts" with something else depending on
- * the amount of original code.
- *
- * (Derivative works does not include programs which link against, run or include
- * the source verbatim in their source distributions)
- */
-
-/** @file dns.h
- *
- * Welcome, gentle reader
- *
- * Async DNS lookups are really a whole lot harder than they should be,
- * mostly stemming from the fact that the libc resolver has never been
- * very good at them. Before you use this library you should see if libc
- * can do the job for you with the modern async call getaddrinfo_a
- * (see http://www.imperialviolet.org/page25.html#e498). Otherwise,
- * please continue.
- *
- * The library keeps track of the state of nameservers and will avoid
- * them when they go down. Otherwise it will round robin between them.
- *
- * Quick start guide:
- * #include "evdns.h"
- * void callback(int result, char type, int count, int ttl,
- * void *addresses, void *arg);
- * evdns_resolv_conf_parse(DNS_OPTIONS_ALL, "/etc/resolv.conf");
- * evdns_resolve("www.hostname.com", 0, callback, NULL);
- *
- * When the lookup is complete the callback function is called. The
- * first argument will be one of the DNS_ERR_* defines in evdns.h.
- * Hopefully it will be DNS_ERR_NONE, in which case type will be
- * DNS_IPv4_A, count will be the number of IP addresses, ttl is the time
- * which the data can be cached for (in seconds), addresses will point
- * to an array of uint32_t's and arg will be whatever you passed to
- * evdns_resolve.
- *
- * Searching:
- *
- * In order for this library to be a good replacement for glibc's resolver it
- * supports searching. This involves setting a list of default domains, in
- * which names will be queried for. The number of dots in the query name
- * determines the order in which this list is used.
- *
- * Searching appears to be a single lookup from the point of view of the API,
- * although many DNS queries may be generated from a single call to
- * evdns_resolve. Searching can also drastically slow down the resolution
- * of names.
- *
- * To disable searching:
- * 1. Never set it up. If you never call evdns_resolv_conf_parse or
- * evdns_search_add then no searching will occur.
- *
- * 2. If you do call evdns_resolv_conf_parse then don't pass
- * DNS_OPTION_SEARCH (or DNS_OPTIONS_ALL, which implies it).
- *
- * 3. When calling evdns_resolve, pass the DNS_QUERY_NO_SEARCH flag.
- *
- * The order of searches depends on the number of dots in the name. If the
- * number is greater than the ndots setting then the names is first tried
- * globally. Otherwise each search domain is appended in turn.
- *
- * The ndots setting can either be set from a resolv.conf, or by calling
- * evdns_search_ndots_set.
- *
- * For example, with ndots set to 1 (the default) and a search domain list of
- * ["myhome.net"]:
- * Query: www
- * Order: www.myhome.net, www.
- *
- * Query: www.abc
- * Order: www.abc., www.abc.myhome.net
- *
- * Internals:
- *
- * Requests are kept in two queues. The first is the inflight queue. In
- * this queue requests have an allocated transaction id and nameserver.
- * They will soon be transmitted if they haven't already been.
- *
- * The second is the waiting queue. The size of the inflight ring is
- * limited and all other requests wait in waiting queue for space. This
- * bounds the number of concurrent requests so that we don't flood the
- * nameserver. Several algorithms require a full walk of the inflight
- * queue and so bounding its size keeps thing going nicely under huge
- * (many thousands of requests) loads.
- *
- * If a nameserver loses too many requests it is considered down and we
- * try not to use it. After a while we send a probe to that nameserver
- * (a lookup for google.com) and, if it replies, we consider it working
- * again. If the nameserver fails a probe we wait longer to try again
- * with the next probe.
- */
-
-#ifndef _EVENT2_DNS_H_
-#define _EVENT2_DNS_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/* For integer types. */
-#include <event2/util.h>
-
-/** Error codes 0-5 are as described in RFC 1035. */
-#define DNS_ERR_NONE 0
-/** The name server was unable to interpret the query */
-#define DNS_ERR_FORMAT 1
-/** The name server was unable to process this query due to a problem with the
- * name server */
-#define DNS_ERR_SERVERFAILED 2
-/** The domain name does not exist */
-#define DNS_ERR_NOTEXIST 3
-/** The name server does not support the requested kind of query */
-#define DNS_ERR_NOTIMPL 4
-/** The name server refuses to reform the specified operation for policy
- * reasons */
-#define DNS_ERR_REFUSED 5
-/** The reply was truncated or ill-formatted */
-#define DNS_ERR_TRUNCATED 65
-/** An unknown error occurred */
-#define DNS_ERR_UNKNOWN 66
-/** Communication with the server timed out */
-#define DNS_ERR_TIMEOUT 67
-/** The request was canceled because the DNS subsystem was shut down. */
-#define DNS_ERR_SHUTDOWN 68
-/** The request was canceled via a call to evdns_cancel_request */
-#define DNS_ERR_CANCEL 69
-
-#define DNS_IPv4_A 1
-#define DNS_PTR 2
-#define DNS_IPv6_AAAA 3
-
-#define DNS_QUERY_NO_SEARCH 1
-
-#define DNS_OPTION_SEARCH 1
-#define DNS_OPTION_NAMESERVERS 2
-#define DNS_OPTION_MISC 4
-#define DNS_OPTION_HOSTSFILE 8
-#define DNS_OPTIONS_ALL 15
-
-/* Obsolete name for DNS_QUERY_NO_SEARCH */
-#define DNS_NO_SEARCH DNS_QUERY_NO_SEARCH
-
-/**
- * The callback that contains the results from a lookup.
- * - result is one of the DNS_ERR_* values (DNS_ERR_NONE for success)
- * - type is either DNS_IPv4_A or DNS_PTR or DNS_IPv6_AAAA
- * - count contains the number of addresses of form type
- * - ttl is the number of seconds the resolution may be cached for.
- * - addresses needs to be cast according to type. It will be an array of
- * 4-byte sequences for ipv4, or an array of 16-byte sequences for ipv6,
- * or a nul-terminated string for PTR.
- */
-typedef void (*evdns_callback_type) (int result, char type, int count, int ttl, void *addresses, void *arg);
-
-struct evdns_base;
-struct event_base;
-
-/**
- Initialize the asynchronous DNS library.
-
- This function initializes support for non-blocking name resolution by
- calling evdns_resolv_conf_parse() on UNIX and
- evdns_config_windows_nameservers() on Windows.
-
- @param event_base the event base to associate the dns client with
- @param initialize_nameservers 1 if resolve.conf processing should occur
- @return 0 if successful, or -1 if an error occurred
- @see evdns_base_free()
- */
-struct evdns_base * evdns_base_new(struct event_base *event_base, int initialize_nameservers);
-
-
-/**
- Shut down the asynchronous DNS resolver and terminate all active requests.
-
- If the 'fail_requests' option is enabled, all active requests will return
- an empty result with the error flag set to DNS_ERR_SHUTDOWN. Otherwise,
- the requests will be silently discarded.
-
- @param evdns_base the evdns base to free
- @param fail_requests if zero, active requests will be aborted; if non-zero,
- active requests will return DNS_ERR_SHUTDOWN.
- @see evdns_base_new()
- */
-void evdns_base_free(struct evdns_base *base, int fail_requests);
-
-/**
- Convert a DNS error code to a string.
-
- @param err the DNS error code
- @return a string containing an explanation of the error code
-*/
-const char *evdns_err_to_string(int err);
-
-
-/**
- Add a nameserver.
-
- The address should be an IPv4 address in network byte order.
- The type of address is chosen so that it matches in_addr.s_addr.
-
- @param base the evdns_base to which to add the name server
- @param address an IP address in network byte order
- @return 0 if successful, or -1 if an error occurred
- @see evdns_base_nameserver_ip_add()
- */
-int evdns_base_nameserver_add(struct evdns_base *base,
- unsigned long int address);
-
-/**
- Get the number of configured nameservers.
-
- This returns the number of configured nameservers (not necessarily the
- number of running nameservers). This is useful for double-checking
- whether our calls to the various nameserver configuration functions
- have been successful.
-
- @param base the evdns_base to which to apply this operation
- @return the number of configured nameservers
- @see evdns_base_nameserver_add()
- */
-int evdns_base_count_nameservers(struct evdns_base *base);
-
-/**
- Remove all configured nameservers, and suspend all pending resolves.
-
- Resolves will not necessarily be re-attempted until evdns_resume() is called.
-
- @param base the evdns_base to which to apply this operation
- @return 0 if successful, or -1 if an error occurred
- @see evdns_base_resume()
- */
-int evdns_base_clear_nameservers_and_suspend(struct evdns_base *base);
-
-
-/**
- Resume normal operation and continue any suspended resolve requests.
-
- Re-attempt resolves left in limbo after an earlier call to
- evdns_clear_nameservers_and_suspend().
-
- @param base the evdns_base to which to apply this operation
- @return 0 if successful, or -1 if an error occurred
- @see evdns_base_clear_nameservers_and_suspend()
- */
-int evdns_base_resume(struct evdns_base *base);
-
-/**
- Add a nameserver by string address.
-
- This function parses a n IPv4 or IPv6 address from a string and adds it as a
- nameserver. It supports the following formats:
- - [IPv6Address]:port
- - [IPv6Address]
- - IPv6Address
- - IPv4Address:port
- - IPv4Address
-
- If no port is specified, it defaults to 53.
-
- @param base the evdns_base to which to apply this operation
- @return 0 if successful, or -1 if an error occurred
- @see evdns_base_nameserver_add()
- */
-int evdns_base_nameserver_ip_add(struct evdns_base *base,
- const char *ip_as_string);
-
-/**
- Add a nameserver by sockaddr.
- **/
-int
-evdns_base_nameserver_sockaddr_add(struct evdns_base *base,
- const struct sockaddr *sa, ev_socklen_t len, unsigned flags);
-
-struct evdns_request;
-
-/**
- Lookup an A record for a given name.
-
- @param base the evdns_base to which to apply this operation
- @param name a DNS hostname
- @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
- @param callback a callback function to invoke when the request is completed
- @param ptr an argument to pass to the callback function
- @return an evdns_request object if successful, or NULL if an error occurred.
- @see evdns_resolve_ipv6(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6(), evdns_cancel_request()
- */
-struct evdns_request *evdns_base_resolve_ipv4(struct evdns_base *base, const char *name, int flags, evdns_callback_type callback, void *ptr);
-
-/**
- Lookup an AAAA record for a given name.
-
- @param base the evdns_base to which to apply this operation
- @param name a DNS hostname
- @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
- @param callback a callback function to invoke when the request is completed
- @param ptr an argument to pass to the callback function
- @return an evdns_request object if successful, or NULL if an error occurred.
- @see evdns_resolve_ipv4(), evdns_resolve_reverse(), evdns_resolve_reverse_ipv6(), evdns_cancel_request()
- */
-struct evdns_request *evdns_base_resolve_ipv6(struct evdns_base *base, const char *name, int flags, evdns_callback_type callback, void *ptr);
-
-struct in_addr;
-struct in6_addr;
-
-/**
- Lookup a PTR record for a given IP address.
-
- @param base the evdns_base to which to apply this operation
- @param in an IPv4 address
- @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
- @param callback a callback function to invoke when the request is completed
- @param ptr an argument to pass to the callback function
- @return an evdns_request object if successful, or NULL if an error occurred.
- @see evdns_resolve_reverse_ipv6(), evdns_cancel_request()
- */
-struct evdns_request *evdns_base_resolve_reverse(struct evdns_base *base, const struct in_addr *in, int flags, evdns_callback_type callback, void *ptr);
-
-
-/**
- Lookup a PTR record for a given IPv6 address.
-
- @param base the evdns_base to which to apply this operation
- @param in an IPv6 address
- @param flags either 0, or DNS_QUERY_NO_SEARCH to disable searching for this query.
- @param callback a callback function to invoke when the request is completed
- @param ptr an argument to pass to the callback function
- @return an evdns_request object if successful, or NULL if an error occurred.
- @see evdns_resolve_reverse_ipv6(), evdns_cancel_request()
- */
-struct evdns_request *evdns_base_resolve_reverse_ipv6(struct evdns_base *base, const struct in6_addr *in, int flags, evdns_callback_type callback, void *ptr);
-
-/**
- Cancels a pending DNS resolution request.
-
- @param base the evdns_base that was used to make the request
- @param req the evdns_request that was returned by calling a resolve function
- @see evdns_base_resolve_ip4(), evdns_base_resolve_ipv6, evdns_base_resolve_reverse
-*/
-void evdns_cancel_request(struct evdns_base *base, struct evdns_request *req);
-
-/**
- Set the value of a configuration option.
-
- The currently available configuration options are:
-
- ndots, timeout, max-timeouts, max-inflight, attempts, randomize-case,
- bind-to, initial-probe-timeout, getaddrinfo-allow-skew.
-
- In versions before Libevent 2.0.3-alpha, the option name needed to end with
- a colon.
-
- @param base the evdns_base to which to apply this operation
- @param option the name of the configuration option to be modified
- @param val the value to be set
- @return 0 if successful, or -1 if an error occurred
- */
-int evdns_base_set_option(struct evdns_base *base, const char *option, const char *val);
-
-
-/**
- Parse a resolv.conf file.
-
- The 'flags' parameter determines what information is parsed from the
- resolv.conf file. See the man page for resolv.conf for the format of this
- file.
-
- The following directives are not parsed from the file: sortlist, rotate,
- no-check-names, inet6, debug.
-
- If this function encounters an error, the possible return values are: 1 =
- failed to open file, 2 = failed to stat file, 3 = file too large, 4 = out of
- memory, 5 = short read from file, 6 = no nameservers listed in the file
-
- @param base the evdns_base to which to apply this operation
- @param flags any of DNS_OPTION_NAMESERVERS|DNS_OPTION_SEARCH|DNS_OPTION_MISC|
- DNS_OPTIONS_HOSTSFILE|DNS_OPTIONS_ALL
- @param filename the path to the resolv.conf file
- @return 0 if successful, or various positive error codes if an error
- occurred (see above)
- @see resolv.conf(3), evdns_config_windows_nameservers()
- */
-int evdns_base_resolv_conf_parse(struct evdns_base *base, int flags, const char *const filename);
-
-/**
- Load an /etc/hosts-style file from 'hosts_fname' into 'base'.
-
- If hosts_fname is NULL, add minimal entries for localhost, and nothing
- else.
-
- Note that only evdns_getaddrinfo uses the /etc/hosts entries.
-
- Return 0 on success, negative on failure.
-*/
-int evdns_base_load_hosts(struct evdns_base *base, const char *hosts_fname);
-
-/**
- Obtain nameserver information using the Windows API.
-
- Attempt to configure a set of nameservers based on platform settings on
- a win32 host. Preferentially tries to use GetNetworkParams; if that fails,
- looks in the registry.
-
- @return 0 if successful, or -1 if an error occurred
- @see evdns_resolv_conf_parse()
- */
-#ifdef WIN32
-int evdns_base_config_windows_nameservers(struct evdns_base *);
-#define EVDNS_BASE_CONFIG_WINDOWS_NAMESERVERS_IMPLEMENTED
-#endif
-
-
-/**
- Clear the list of search domains.
- */
-void evdns_base_search_clear(struct evdns_base *base);
-
-
-/**
- Add a domain to the list of search domains
-
- @param domain the domain to be added to the search list
- */
-void evdns_base_search_add(struct evdns_base *base, const char *domain);
-
-
-/**
- Set the 'ndots' parameter for searches.
-
- Sets the number of dots which, when found in a name, causes
- the first query to be without any search domain.
-
- @param ndots the new ndots parameter
- */
-void evdns_base_search_ndots_set(struct evdns_base *base, const int ndots);
-
-/**
- A callback that is invoked when a log message is generated
-
- @param is_warning indicates if the log message is a 'warning'
- @param msg the content of the log message
- */
-typedef void (*evdns_debug_log_fn_type)(int is_warning, const char *msg);
-
-
-/**
- Set the callback function to handle DNS log messages. If this
- callback is not set, evdns log messages are handled with the regular
- Libevent logging system.
-
- @param fn the callback to be invoked when a log message is generated
- */
-void evdns_set_log_fn(evdns_debug_log_fn_type fn);
-
-/**
- Set a callback that will be invoked to generate transaction IDs. By
- default, we pick transaction IDs based on the current clock time, which
- is bad for security.
-
- @param fn the new callback, or NULL to use the default.
-
- NOTE: This function has no effect in Libevent 2.0.4-alpha and later,
- since Libevent now provides its own secure RNG.
- */
-void evdns_set_transaction_id_fn(ev_uint16_t (*fn)(void));
-
-/**
- Set a callback used to generate random bytes. By default, we use
- the same function as passed to evdns_set_transaction_id_fn to generate
- bytes two at a time. If a function is provided here, it's also used
- to generate transaction IDs.
-
- NOTE: This function has no effect in Libevent 2.0.4-alpha and later,
- since Libevent now provides its own secure RNG.
-*/
-void evdns_set_random_bytes_fn(void (*fn)(char *, size_t));
-
-/*
- * Functions used to implement a DNS server.
- */
-
-struct evdns_server_request;
-struct evdns_server_question;
-
-/**
- A callback to implement a DNS server. The callback function receives a DNS
- request. It should then optionally add a number of answers to the reply
- using the evdns_server_request_add_*_reply functions, before calling either
- evdns_server_request_respond to send the reply back, or
- evdns_server_request_drop to decline to answer the request.
-
- @param req A newly received request
- @param user_data A pointer that was passed to
- evdns_add_server_port_with_base().
- */
-typedef void (*evdns_request_callback_fn_type)(struct evdns_server_request *, void *);
-#define EVDNS_ANSWER_SECTION 0
-#define EVDNS_AUTHORITY_SECTION 1
-#define EVDNS_ADDITIONAL_SECTION 2
-
-#define EVDNS_TYPE_A 1
-#define EVDNS_TYPE_NS 2
-#define EVDNS_TYPE_CNAME 5
-#define EVDNS_TYPE_SOA 6
-#define EVDNS_TYPE_PTR 12
-#define EVDNS_TYPE_MX 15
-#define EVDNS_TYPE_TXT 16
-#define EVDNS_TYPE_AAAA 28
-
-#define EVDNS_QTYPE_AXFR 252
-#define EVDNS_QTYPE_ALL 255
-
-#define EVDNS_CLASS_INET 1
-
-/* flags that can be set in answers; as part of the err parameter */
-#define EVDNS_FLAGS_AA 0x400
-#define EVDNS_FLAGS_RD 0x080
-
-/** Create a new DNS server port.
-
- @param base The event base to handle events for the server port.
- @param socket A UDP socket to accept DNS requests.
- @param flags Always 0 for now.
- @param callback A function to invoke whenever we get a DNS request
- on the socket.
- @param user_data Data to pass to the callback.
- @return an evdns_server_port structure for this server port.
- */
-struct evdns_server_port *evdns_add_server_port_with_base(struct event_base *base, evutil_socket_t socket, int flags, evdns_request_callback_fn_type callback, void *user_data);
-/** Close down a DNS server port, and free associated structures. */
-void evdns_close_server_port(struct evdns_server_port *port);
-
-/** Sets some flags in a reply we're building.
- Allows setting of the AA or RD flags
- */
-void evdns_server_request_set_flags(struct evdns_server_request *req, int flags);
-
-/* Functions to add an answer to an in-progress DNS reply.
- */
-int evdns_server_request_add_reply(struct evdns_server_request *req, int section, const char *name, int type, int dns_class, int ttl, int datalen, int is_name, const char *data);
-int evdns_server_request_add_a_reply(struct evdns_server_request *req, const char *name, int n, const void *addrs, int ttl);
-int evdns_server_request_add_aaaa_reply(struct evdns_server_request *req, const char *name, int n, const void *addrs, int ttl);
-int evdns_server_request_add_ptr_reply(struct evdns_server_request *req, struct in_addr *in, const char *inaddr_name, const char *hostname, int ttl);
-int evdns_server_request_add_cname_reply(struct evdns_server_request *req, const char *name, const char *cname, int ttl);
-
-/**
- Send back a response to a DNS request, and free the request structure.
-*/
-int evdns_server_request_respond(struct evdns_server_request *req, int err);
-/**
- Free a DNS request without sending back a reply.
-*/
-int evdns_server_request_drop(struct evdns_server_request *req);
-struct sockaddr;
-/**
- Get the address that made a DNS request.
- */
-int evdns_server_request_get_requesting_addr(struct evdns_server_request *_req, struct sockaddr *sa, int addr_len);
-
-/** Callback for evdns_getaddrinfo. */
-typedef void (*evdns_getaddrinfo_cb)(int result, struct evutil_addrinfo *res, void *arg);
-
-struct evdns_base;
-struct evdns_getaddrinfo_request;
-/** Make a non-blocking getaddrinfo request using the dns_base in 'dns_base'.
- *
- * If we can answer the request immediately (with an error or not!), then we
- * invoke cb immediately and return NULL. Otherwise we return
- * an evdns_getaddrinfo_request and invoke cb later.
- *
- * When the callback is invoked, we pass as its first argument the error code
- * that getaddrinfo would return (or 0 for no error). As its second argument,
- * we pass the evutil_addrinfo structures we found (or NULL on error). We
- * pass 'arg' as the third argument.
- *
- * Limitations:
- *
- * - The AI_V4MAPPED and AI_ALL flags are not currently implemented.
- * - For ai_socktype, we only handle SOCKTYPE_STREAM, SOCKTYPE_UDP, and 0.
- * - For ai_protocol, we only handle IPPROTO_TCP, IPPROTO_UDP, and 0.
- */
-struct evdns_getaddrinfo_request *evdns_getaddrinfo(
- struct evdns_base *dns_base,
- const char *nodename, const char *servname,
- const struct evutil_addrinfo *hints_in,
- evdns_getaddrinfo_cb cb, void *arg);
-
-/* Cancel an in-progress evdns_getaddrinfo. This MUST NOT be called after the
- * getaddrinfo's callback has been invoked. The resolves will be canceled,
- * and the callback will be invoked with the error EVUTIL_EAI_CANCEL. */
-void evdns_getaddrinfo_cancel(struct evdns_getaddrinfo_request *req);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* !_EVENT2_DNS_H_ */
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