135#ifndef EVENT2_DNS_H_INCLUDED_
136#define EVENT2_DNS_H_INCLUDED_
138#include <event2/visibility.h>
148#define DNS_ERR_NONE 0
150#define DNS_ERR_FORMAT 1
153#define DNS_ERR_SERVERFAILED 2
155#define DNS_ERR_NOTEXIST 3
157#define DNS_ERR_NOTIMPL 4
160#define DNS_ERR_REFUSED 5
162#define DNS_ERR_TRUNCATED 65
164#define DNS_ERR_UNKNOWN 66
166#define DNS_ERR_TIMEOUT 67
168#define DNS_ERR_SHUTDOWN 68
170#define DNS_ERR_CANCEL 69
174#define DNS_ERR_NODATA 70
178#define DNS_IPv6_AAAA 3
180#define DNS_QUERY_NO_SEARCH 1
183#define DNS_OPTION_SEARCH 1
185#define DNS_OPTION_NAMESERVERS 2
195#define DNS_OPTION_MISC 4
197#define DNS_OPTION_HOSTSFILE 8
205#define DNS_OPTIONS_ALL ( \
206 DNS_OPTION_SEARCH | \
207 DNS_OPTION_NAMESERVERS | \
209 DNS_OPTION_HOSTSFILE | \
214#define DNS_OPTION_NAMESERVERS_NO_DEFAULT 16
217#define DNS_NO_SEARCH DNS_QUERY_NO_SEARCH
229typedef void (*
evdns_callback_type) (
int result,
char type,
int count,
int ttl,
void *addresses,
void *arg);
235#define EVDNS_BASE_INITIALIZE_NAMESERVERS 1
238#define EVDNS_BASE_DISABLE_WHEN_INACTIVE 0x8000
242#define EVDNS_BASE_NAMESERVERS_NO_DEFAULT 0x10000
308 unsigned long int address);
370 const char *ip_as_string);
378 const struct sockaddr *sa, ev_socklen_t len,
unsigned flags);
514#if defined(EVENT_IN_DOXYGEN_) || defined(_WIN32)
527#define EVDNS_BASE_CONFIG_WINDOWS_NAMESERVERS_IMPLEMENTED
606struct evdns_server_request;
607struct evdns_server_question;
621#define EVDNS_ANSWER_SECTION 0
622#define EVDNS_AUTHORITY_SECTION 1
623#define EVDNS_ADDITIONAL_SECTION 2
625#define EVDNS_TYPE_A 1
626#define EVDNS_TYPE_NS 2
627#define EVDNS_TYPE_CNAME 5
628#define EVDNS_TYPE_SOA 6
629#define EVDNS_TYPE_PTR 12
630#define EVDNS_TYPE_MX 15
631#define EVDNS_TYPE_TXT 16
632#define EVDNS_TYPE_AAAA 28
634#define EVDNS_QTYPE_AXFR 252
635#define EVDNS_QTYPE_ALL 255
637#define EVDNS_CLASS_INET 1
640#define EVDNS_FLAGS_AA 0x400
641#define EVDNS_FLAGS_RD 0x080
669int 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);
671int evdns_server_request_add_a_reply(
struct evdns_server_request *req,
const char *name,
int n,
const void *addrs,
int ttl);
673int evdns_server_request_add_aaaa_reply(
struct evdns_server_request *req,
const char *name,
int n,
const void *addrs,
int ttl);
675int evdns_server_request_add_ptr_reply(
struct evdns_server_request *req,
struct in_addr *in,
const char *inaddr_name,
const char *hostname,
int ttl);
677int evdns_server_request_add_cname_reply(
struct evdns_server_request *req,
const char *name,
const char *cname,
int ttl);
700struct evdns_getaddrinfo_request;
720 struct evdns_base *dns_base,
721 const char *nodename,
const char *servname,
729void evdns_getaddrinfo_cancel(
struct evdns_getaddrinfo_request *req);
745 struct sockaddr *sa, ev_socklen_t len);
void(* evdns_request_callback_fn_type)(struct evdns_server_request *, void *)
A callback to implement a DNS server.
Definition: dns.h:620
EVENT2_EXPORT_SYMBOL void evdns_cancel_request(struct evdns_base *base, struct evdns_request *req)
Cancels a pending DNS resolution request.
EVENT2_EXPORT_SYMBOL int evdns_server_request_get_requesting_addr(struct evdns_server_request *req, struct sockaddr *sa, int addr_len)
Get the address that made a DNS request.
EVENT2_EXPORT_SYMBOL int evdns_base_nameserver_ip_add(struct evdns_base *base, const char *ip_as_string)
Add a nameserver by string address.
void(* evdns_getaddrinfo_cb)(int result, struct evutil_addrinfo *res, void *arg)
Callback for evdns_getaddrinfo.
Definition: dns.h:697
EVENT2_EXPORT_SYMBOL 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)
Lookup a PTR record for a given IPv6 address.
EVENT2_EXPORT_SYMBOL int evdns_server_request_drop(struct evdns_server_request *req)
Free a DNS request without sending back a reply.
EVENT2_EXPORT_SYMBOL int evdns_base_get_nameserver_addr(struct evdns_base *base, int idx, struct sockaddr *sa, ev_socklen_t len)
Retrieve the address of the 'idx'th configured nameserver.
EVENT2_EXPORT_SYMBOL void evdns_base_clear_host_addresses(struct evdns_base *base)
Remove all hosts entries that have been loaded into the event_base via evdns_base_load_hosts or via e...
EVENT2_EXPORT_SYMBOL void evdns_set_transaction_id_fn(ev_uint16_t(*fn)(void))
Set a callback that will be invoked to generate transaction IDs.
EVENT2_EXPORT_SYMBOL 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 IP address.
EVENT2_EXPORT_SYMBOL int evdns_base_resume(struct evdns_base *base)
Resume normal operation and continue any suspended resolve requests.
void(* evdns_callback_type)(int result, char type, int count, int ttl, void *addresses, void *arg)
The callback that contains the results from a lookup.
Definition: dns.h:229
EVENT2_EXPORT_SYMBOL int evdns_base_load_hosts(struct evdns_base *base, const char *hosts_fname)
Load an /etc/hosts-style file from 'hosts_fname' into 'base'.
EVENT2_EXPORT_SYMBOL int evdns_base_nameserver_add(struct evdns_base *base, unsigned long int address)
Add a nameserver.
EVENT2_EXPORT_SYMBOL int evdns_server_request_respond(struct evdns_server_request *req, int err)
Send back a response to a DNS request, and free the request structure.
EVENT2_EXPORT_SYMBOL const char * evdns_err_to_string(int err)
Convert a DNS error code to a string.
EVENT2_EXPORT_SYMBOL struct evdns_request * evdns_base_resolve_ipv6(struct evdns_base *base, const char *name, int flags, evdns_callback_type callback, void *ptr)
Lookup an AAAA record for a given name.
EVENT2_EXPORT_SYMBOL int evdns_base_count_nameservers(struct evdns_base *base)
Get the number of configured nameservers.
EVENT2_EXPORT_SYMBOL struct evdns_base * evdns_base_new(struct event_base *event_base, int initialize_nameservers)
Initialize the asynchronous DNS library.
EVENT2_EXPORT_SYMBOL int evdns_base_set_option(struct evdns_base *base, const char *option, const char *val)
Set the value of a configuration option.
EVENT2_EXPORT_SYMBOL int evdns_base_resolv_conf_parse(struct evdns_base *base, int flags, const char *const filename)
Parse a resolv.conf file.
EVENT2_EXPORT_SYMBOL void evdns_base_search_add(struct evdns_base *base, const char *domain)
Add a domain to the list of search domains.
EVENT2_EXPORT_SYMBOL void evdns_server_request_set_flags(struct evdns_server_request *req, int flags)
Sets some flags in a reply we're building.
void(* evdns_debug_log_fn_type)(int is_warning, const char *msg)
A callback that is invoked when a log message is generated.
Definition: dns.h:564
EVENT2_EXPORT_SYMBOL void evdns_set_random_bytes_fn(void(*fn)(char *, size_t))
Set a callback used to generate random bytes.
EVENT2_EXPORT_SYMBOL void evdns_base_search_clear(struct evdns_base *base)
Clear the list of search domains.
EVENT2_EXPORT_SYMBOL void evdns_base_free(struct evdns_base *base, int fail_requests)
Shut down the asynchronous DNS resolver and terminate all active requests.
EVENT2_EXPORT_SYMBOL void evdns_close_server_port(struct evdns_server_port *port)
Close down a DNS server port, and free associated structures.
EVENT2_EXPORT_SYMBOL int evdns_base_config_windows_nameservers(struct evdns_base *)
Obtain nameserver information using the Windows API.
EVENT2_EXPORT_SYMBOL int evdns_base_nameserver_sockaddr_add(struct evdns_base *base, const struct sockaddr *sa, ev_socklen_t len, unsigned flags)
Add a nameserver by sockaddr.
EVENT2_EXPORT_SYMBOL struct evdns_request * evdns_base_resolve_ipv4(struct evdns_base *base, const char *name, int flags, evdns_callback_type callback, void *ptr)
Lookup an A record for a given name.
EVENT2_EXPORT_SYMBOL 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)
Create a new DNS server port.
EVENT2_EXPORT_SYMBOL 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)
Make a non-blocking getaddrinfo request using the dns_base in 'dns_base'.
EVENT2_EXPORT_SYMBOL void evdns_base_search_ndots_set(struct evdns_base *base, const int ndots)
Set the 'ndots' parameter for searches.
EVENT2_EXPORT_SYMBOL void evdns_set_log_fn(evdns_debug_log_fn_type fn)
Set the callback function to handle DNS log messages.
EVENT2_EXPORT_SYMBOL int evdns_base_clear_nameservers_and_suspend(struct evdns_base *base)
Remove all configured nameservers, and suspend all pending resolves.
Structure to hold information and state for a Libevent dispatch loop.
Definition: event.h:219
A definition of struct addrinfo for systems that lack it.
Definition: util.h:679
Common convenience functions for cross-platform portability and related socket manipulations.
#define evutil_socket_t
A type wide enough to hold the output of "socket()" or "accept()".
Definition: util.h:310