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3 (C) 2001-2013 Christian Grothoff (and other contributing authors)
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13 General Public License for more details.
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22 * @file include/gnunet_resolver_service.h
23 * @brief functions related to doing DNS lookups
24 * @author Christian Grothoff
25 * @defgroup resolver asynchronous standard DNS lookups
29 #ifndef GNUNET_RESOLVER_SERVICE_H
30 #define GNUNET_RESOLVER_SERVICE_H
35 #if 0 /* keep Emacsens' auto-indent happy */
40 #include "gnunet_configuration_lib.h"
41 #include "gnunet_scheduler_lib.h"
42 #include "gnunet_time_lib.h"
46 * Function called by the resolver for each address obtained from DNS.
49 * @param addr one of the addresses of the host, NULL for the last address
50 * @param addrlen length of @a addr
53 (*GNUNET_RESOLVER_AddressCallback) (void *cls,
54 const struct sockaddr *addr,
59 * Handle to a request given to the resolver. Can be used to cancel
60 * the request prior to the timeout or successful execution.
62 struct GNUNET_RESOLVER_RequestHandle;
65 * Create the connection to the resolver service.
67 * @param cfg configuration to use
70 GNUNET_RESOLVER_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
74 * Destroy the connection to the resolver service.
77 GNUNET_RESOLVER_disconnect (void);
81 * Convert a string to one or more IP addresses.
83 * @param hostname the hostname to resolve
84 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
85 * @param callback function to call with addresses
86 * @param callback_cls closure for @a callback
87 * @param timeout how long to try resolving
88 * @return handle that can be used to cancel the request, NULL on error
90 struct GNUNET_RESOLVER_RequestHandle *
91 GNUNET_RESOLVER_ip_get (const char *hostname,
93 struct GNUNET_TIME_Relative timeout,
94 GNUNET_RESOLVER_AddressCallback callback,
99 * Resolve our hostname to an IP address.
101 * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
102 * @param callback function to call with addresses
103 * @param cls closure for @a callback
104 * @param timeout how long to try resolving
105 * @return handle that can be used to cancel the request, NULL on error
107 struct GNUNET_RESOLVER_RequestHandle *
108 GNUNET_RESOLVER_hostname_resolve (int af,
109 struct GNUNET_TIME_Relative timeout,
110 GNUNET_RESOLVER_AddressCallback callback,
115 * Function called by the resolver for each hostname obtained from DNS.
118 * @param hostname one of the names for the host, NULL
119 * on the last call to the callback
122 (*GNUNET_RESOLVER_HostnameCallback) (void *cls,
123 const char *hostname);
126 * Get local fully qualified domain name
128 * @return local hostname, caller must free
131 GNUNET_RESOLVER_local_fqdn_get (void);
135 * Perform a reverse DNS lookup.
137 * @param sa host address
138 * @param salen length of @a sa
139 * @param do_resolve use #GNUNET_NO to return numeric hostname
140 * @param timeout how long to try resolving
141 * @param callback function to call with hostnames
142 * @param cls closure for @a callback
143 * @return handle that can be used to cancel the request, NULL on error
145 struct GNUNET_RESOLVER_RequestHandle *
146 GNUNET_RESOLVER_hostname_get (const struct sockaddr *sa,
149 struct GNUNET_TIME_Relative timeout,
150 GNUNET_RESOLVER_HostnameCallback callback,
155 * Cancel a request that is still pending with the resolver.
156 * Note that a client MUST NOT cancel a request that has
157 * been completed (i.e, the callback has been called to
158 * signal timeout or the final result).
160 * @param rh handle of request to cancel
163 GNUNET_RESOLVER_request_cancel (struct GNUNET_RESOLVER_RequestHandle *rh);
166 #if 0 /* keep Emacsens' auto-indent happy */
173 /** @} */ /* end of group resolver */
175 /* ifndef GNUNET_RESOLVER_SERVICE_H */
177 /* end of gnunet_resolver_service.h */