7 This file is part of avahi.
9 avahi is free software; you can redistribute it and/or modify it
10 under the terms of the GNU Lesser General Public License as
11 published by the Free Software Foundation; either version 2.1 of the
12 License, or (at your option) any later version.
14 avahi is distributed in the hope that it will be useful, but WITHOUT
15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
17 Public License for more details.
19 You should have received a copy of the GNU Lesser General Public
20 License along with avahi; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 /** \file core.h The Avahi Multicast DNS and DNS Service Discovery implmentation. */
29 /** \example publish-service.c Example how to register a DNS-SD
30 * service using an embedded mDNS stack. It behaves like a network
31 * printer registering both an IPP and a BSD LPR service. */
33 /** \example browse-services.c Example how to browse for DNS-SD
34 * services using an embedded mDNS stack. */
36 #include <avahi-common/cdecl.h>
40 /** An mDNS responder object */
41 typedef struct AvahiServer AvahiServer;
43 /** A locally registered DNS resource record */
44 typedef struct AvahiEntry AvahiEntry;
46 /** A group of locally registered DNS RRs */
47 typedef struct AvahiEntryGroup AvahiEntryGroup;
51 #include <avahi-common/address.h>
52 #include <avahi-common/rr.h>
53 #include <avahi-common/alternative.h>
57 /** Error codes used by avahi */
59 AVAHI_OK = 0, /**< OK */
60 AVAHI_ERR_FAILURE = -1, /**< Generic error code */
61 AVAHI_ERR_BAD_STATE = -2 /**< Object was in a bad state */
64 /** States of a server object */
66 AVAHI_SERVER_INVALID = -1, /**< Invalid state (initial) */
67 AVAHI_SERVER_REGISTERING = 0, /**< Host RRs are being registered */
68 AVAHI_SERVER_RUNNING, /**< All host RRs have been established */
69 AVAHI_SERVER_COLLISION /**< There is a collision with a host RR. All host RRs have been withdrawn, the user should set a new host name via avahi_server_set_host_name() */
72 /** Flags for server entries */
74 AVAHI_ENTRY_NULL = 0, /**< No special flags */
75 AVAHI_ENTRY_UNIQUE = 1, /**< The RRset is intended to be unique */
76 AVAHI_ENTRY_NOPROBE = 2, /**< Though the RRset is intended to be unique no probes shall be sent */
77 AVAHI_ENTRY_NOANNOUNCE = 4, /**< Do not announce this RR to other hosts */
78 AVAHI_ENTRY_ALLOWMUTIPLE = 8 /**< Allow multiple local records of this type, even if they are intended to be unique */
81 /** States of an entry group object */
83 AVAHI_ENTRY_GROUP_UNCOMMITED = -1, /**< The group has not yet been commited, the user must still call avahi_entry_group_commit() */
84 AVAHI_ENTRY_GROUP_REGISTERING = 0, /**< The entries of the group are currently being registered */
85 AVAHI_ENTRY_GROUP_ESTABLISHED, /**< The entries have successfully been established */
86 AVAHI_ENTRY_GROUP_COLLISION /**< A name collision for one of the entries in the group has been detected, the entries have been withdrawn */
87 } AvahiEntryGroupState;
89 /** Prototype for callback functions which are called whenever the state of an AvahiServer object changes */
90 typedef void (*AvahiServerCallback) (AvahiServer *s, AvahiServerState state, gpointer userdata);
92 /** Prototype for callback functions which are called whenever the state of an AvahiEntryGroup object changes */
93 typedef void (*AvahiEntryGroupCallback) (AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, gpointer userdata);
95 /** Stores configuration options for a server instance */
96 typedef struct AvahiServerConfig {
97 gchar *host_name; /**< Default host name. If left empty defaults to the result of gethostname(2) of the libc */
98 gchar *domain_name; /**< Default domain name. If left empty defaults to .local */
99 gboolean use_ipv4; /**< Enable IPv4 support */
100 gboolean use_ipv6; /**< Enable IPv6 support */
101 gboolean publish_hinfo; /**< Register a HINFO record for the host containing the local OS and CPU type */
102 gboolean publish_addresses; /**< Register A, AAAA and PTR records for all local IP addresses */
103 gboolean publish_workstation; /**< Register a _workstation._tcp service */
104 gboolean publish_domain; /**< Announce the local domain for browsing */
105 gboolean check_response_ttl; /**< If enabled the server ignores all incoming responses with IP TTL != 255. Newer versions of the RFC do no longer contain this check, so it is disabled by default. */
106 gboolean use_iff_running; /**< Require IFF_RUNNING on local network interfaces. This is the official way to check for link beat. Unfortunately this doesn't work with all drivers. So bettere leave this off. */
107 gboolean enable_reflector; /**< Reflect incoming mDNS traffic to all local networks. This allows mDNS based network browsing beyond ethernet borders */
108 gboolean reflect_ipv; /**< if enable_reflector is TRUE, enable/disable reflecting between IPv4 and IPv6 */
111 /** Allocate a new mDNS responder object. */
112 AvahiServer *avahi_server_new(
113 GMainContext *c, /**< The GLIB main loop context to attach to */
114 const AvahiServerConfig *sc, /**< If non-NULL a pointer to a configuration structure for the server. The server makes an internal deep copy of this structure, so you may free it using avahi_server_config_done() immediately after calling this function. */
115 AvahiServerCallback callback, /**< A callback which is called whenever the state of the server changes */
116 gpointer userdata /**< An opaque pointer which is passed to the callback function */);
118 /** Free an mDNS responder object */
119 void avahi_server_free(AvahiServer* s);
121 /** Fill in default values for a server configuration structure. If you
122 * make use of an AvahiServerConfig structure be sure to initialize
123 * it with this function for the sake of upwards library
124 * compatibility. This call may allocate strings on the heap. To
125 * release this memory make sure to call
126 * avahi_server_config_done(). If you want to replace any strings in
127 * the structure be sure to free the strings filled in by this
128 * function with g_free() first and allocate the replacements with
129 * g_malloc() (or g_strdup()).*/
130 AvahiServerConfig* avahi_server_config_init(
131 AvahiServerConfig *c /**< A structure which shall be filled in */ );
133 /** Make a deep copy of the configuration structure *c to *ret. */
134 AvahiServerConfig* avahi_server_config_copy(
135 AvahiServerConfig *ret /**< destination */,
136 const AvahiServerConfig *c /**< source */);
138 /** Free the data in a server configuration structure. */
139 void avahi_server_config_free(AvahiServerConfig *c);
141 /** Return the currently chosen domain name of the server object. The
142 * return value points to an internally allocated string. Be sure to
143 * make a copy of the string before calling any other library
145 const gchar* avahi_server_get_domain_name(AvahiServer *s);
147 /** Return the currently chosen host name. The return value points to a internally allocated string. */
148 const gchar* avahi_server_get_host_name(AvahiServer *s);
150 /** Return the currently chosen host name as a FQDN ("fully qualified
151 * domain name", i.e. the concatenation of the host and domain
152 * name). The return value points to a internally allocated string. */
153 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s);
155 /** Change the host name of a running mDNS responder. This will drop
156 all automicatilly generated RRs and readd them with the new
157 name. Since the responder has to probe for the new RRs this function
158 takes some time to take effect altough it returns immediately. This
159 function is intended to be called when a host name conflict is
160 reported using AvahiServerCallback. The caller should readd all user
161 defined RRs too since they otherwise continue to point to the outdated
163 gint avahi_server_set_host_name(AvahiServer *s, const gchar *host_name);
165 /** Change the domain name of a running mDNS responder. The same rules
166 * as with avahi_server_set_host_name() apply. */
167 gint avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name);
169 /** Return the opaque user data pointer attached to a server object */
170 gpointer avahi_server_get_data(AvahiServer *s);
172 /** Change the opaque user data pointer attached to a server object */
173 void avahi_server_set_data(AvahiServer *s, gpointer userdata);
175 /** Return the current state of the server object */
176 AvahiServerState avahi_server_get_state(AvahiServer *s);
178 /** Iterate through all local entries of the server. (when g is NULL)
179 * or of a specified entry group. At the first call state should point
180 * to a NULL initialized void pointer, That pointer is used to track
181 * the current iteration. It is not safe to call any other
182 * avahi_server_xxx() function during the iteration. If the last entry
183 * has been read, NULL is returned. */
184 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state);
186 /** Callback prototype for avahi_server_dump() */
187 typedef void (*AvahiDumpCallback)(const gchar *text, gpointer userdata);
189 /** Dump the current server status by calling "callback" for each line. */
190 void avahi_server_dump(AvahiServer *s, AvahiDumpCallback callback, gpointer userdata);
192 /** Create a new entry group. The specified callback function is
193 * called whenever the state of the group changes. Use entry group
194 * objects to keep track of you RRs. Add new RRs to a group using
195 * avahi_server_add_xxx(). Make sure to call avahi_entry_group_commit()
196 * to start the registration process for your RRs */
197 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata);
199 /** Free an entry group. All RRs assigned to the group are removed from the server */
200 void avahi_entry_group_free(AvahiEntryGroup *g);
202 /** Commit an entry group. This starts the probing and registration process for all RRs in the group */
203 gint avahi_entry_group_commit(AvahiEntryGroup *g);
205 /** Remove all entries from the entry group and reset the state to AVAHI_ENTRY_GROUP_UNCOMMITED. */
206 void avahi_entry_group_reset(AvahiEntryGroup *g);
208 /** Return TRUE if the entry group is empty, i.e. has no records attached. */
209 gboolean avahi_entry_group_is_empty(AvahiEntryGroup *g);
211 /** Return the current state of the specified entry group */
212 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g);
214 /** Change the opaque user data pointer attached to an entry group object */
215 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata);
217 /** Return the opaque user data pointer currently set for the entry group object */
218 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g);
220 /** Add a new resource record to the server. Returns 0 on success, negative otherwise. */
221 gint avahi_server_add(
222 AvahiServer *s, /**< The server object to add this record to */
223 AvahiEntryGroup *g, /**< An entry group object if this new record shall be attached to one, or NULL. If you plan to remove the record sometime later you a required to pass an entry group object here. */
224 AvahiIfIndex interface, /**< A numeric index of a network interface to attach this record to, or AVAHI_IF_UNSPEC to attach this record to all interfaces */
225 AvahiProtocol protocol, /**< A protocol family to attach this record to. One of the AVAHI_PROTO_xxx constants. Use AVAHI_PROTO_UNSPEC to make this record available on all protocols (wich means on both IPv4 and IPv6). */
226 AvahiEntryFlags flags, /**< Special flags for this record */
227 AvahiRecord *r /**< The record to add. This function increases the reference counter of this object. */ );
229 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
230 gint avahi_server_add_ptr(
233 AvahiIfIndex interface,
234 AvahiProtocol protocol,
235 AvahiEntryFlags flags,
236 guint32 ttl, /**< DNS TTL for this record */
237 const gchar *name, /**< PTR record name */
238 const gchar *dest /**< pointer destination */ );
240 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
241 gint avahi_server_add_txt(
244 AvahiIfIndex interface,
245 AvahiProtocol protocol,
246 AvahiEntryFlags flags,
247 guint32 ttl, /**< DNS TTL for this record */
248 const gchar *name, /**< TXT record name */
249 ... /**< Text record data, terminated by NULL */);
251 /** Add a PTR RR to the server. Mostly identical to
252 * avahi_server_add_text but takes a va_list instead of a variable
253 * number of arguments */
254 gint avahi_server_add_txt_va(
257 AvahiIfIndex interface,
258 AvahiProtocol protocol,
259 AvahiEntryFlags flags,
264 /** Add a PTR RR to the server. Mostly identical to
265 * avahi_server_add_text but takes an AvahiStringList record instead of a variable
266 * number of arguments. */
267 gint avahi_server_add_txt_strlst(
270 AvahiIfIndex interface,
271 AvahiProtocol protocol,
272 AvahiEntryFlags flags,
275 AvahiStringList *strlst /**< TXT decord data as a AvahiString. This routine makes a deep copy of this object. */ );
277 /** Add an IP address mapping to the server. This will add both the
278 * host-name-to-address and the reverse mapping to the server. See
279 * avahi_server_add() for more information. If adding one of the RRs
280 * fails, the function returns with an error, but it is not defined if
281 * the other RR is deleted from the server or not. Therefore, you have
282 * to free the AvahiEntryGroup and create a new one before
284 gint avahi_server_add_address(
287 AvahiIfIndex interface,
288 AvahiProtocol protocol,
289 AvahiEntryFlags flags,
293 /** Add an DNS-SD service to the Server. This will add all required
294 * RRs to the server. See avahi_server_add() for more information. If
295 * adding one of the RRs fails, the function returns with an error,
296 * but it is not defined if the other RR is deleted from the server or
297 * not. Therefore, you have to free the AvahiEntryGroup and create a
298 * new one before proceeding. */
299 gint avahi_server_add_service(
302 AvahiIfIndex interface,
303 AvahiProtocol protocol,
304 const gchar *name, /**< Service name, e.g. "Lennart's Files" */
305 const gchar *type, /**< DNS-SD type, e.g. "_http._tcp" */
307 const gchar *host, /**< Host name where this servcie resides, or NULL if on the local host */
308 guint16 port, /**< Port number of the service */
309 ... /**< Text records, terminated by NULL */);
311 /** Mostly identical to avahi_server_add_service(), but takes an va_list for the TXT records. */
312 gint avahi_server_add_service_va(
315 AvahiIfIndex interface,
316 AvahiProtocol protocol,
324 /** Mostly identical to avahi_server_add_service(), but takes an AvahiStringList object for the TXT records. The AvahiStringList object is copied. */
325 gint avahi_server_add_service_strlst(
328 AvahiIfIndex interface,
329 AvahiProtocol protocol,
335 AvahiStringList *strlst);
337 /** The type of DNS server */
339 AVAHI_DNS_SERVER_RESOLVE, /**< Unicast DNS servers for normal resolves (_domain._udp)*/
340 AVAHI_DNS_SERVER_UPDATE /**< Unicast DNS servers for updates (_dns-update._udp)*/
341 } AvahiDNSServerType;
343 /** Publish the specified unicast DNS server address via mDNS. You may
344 * browse for records create this way wit
345 * avahi_dns_server_browser_new(). */
346 gint avahi_server_add_dns_server_address(
349 AvahiIfIndex interface,
350 AvahiProtocol protocol,
352 AvahiDNSServerType type,
353 const AvahiAddress *address,
354 guint16 port /** should be 53 */);
356 /** Similar to avahi_server_add_dns_server_address(), but specify a
357 host name instead of an address. The specified host name should be
358 resolvable via mDNS */
359 gint avahi_server_add_dns_server_name(
362 AvahiIfIndex interface,
363 AvahiProtocol protocol,
365 AvahiDNSServerType type,
367 guint16 port /** should be 53 */);
369 /** Type of callback event when browsing */
371 AVAHI_BROWSER_NEW = 0, /**< The object is new on the network */
372 AVAHI_BROWSER_REMOVE = -1 /**< The object has been removed from the network */
375 /** Type of callback event when resolving */
377 AVAHI_RESOLVER_FOUND = 0, /**< RR found, resolving successful */
378 AVAHI_RESOLVER_TIMEOUT = -1 /**< Noone responded within the timeout, resolving failed */
379 } AvahiResolverEvent;
381 /** A browsing object for arbitrary RRs */
382 typedef struct AvahiRecordBrowser AvahiRecordBrowser;
384 /** Callback prototype for AvahiRecordBrowser events */
385 typedef void (*AvahiRecordBrowserCallback)(
386 AvahiRecordBrowser *b, /**< The AvahiRecordBrowser object that is emitting this callback */
387 AvahiIfIndex interface, /**< Logical OS network interface number the record was found on */
388 AvahiProtocol protocol, /**< Protocol number the record was found. */
389 AvahiBrowserEvent event, /**< Browsing event, either AVAHI_BROWSER_NEW or AVAHI_BROWSER_REMOVE */
390 AvahiRecord *record, /**< The record that was found */
391 gpointer userdata /**< Arbitrary user data passed to avahi_record_browser_new() */ );
393 /** Create a new browsing object for arbitrary RRs */
394 AvahiRecordBrowser *avahi_record_browser_new(
395 AvahiServer *server, /**< The server object to which attach this query */
396 AvahiIfIndex interface, /**< Logical OS interface number where to look for the records, or AVAHI_IF_UNSPEC to look on interfaces */
397 AvahiProtocol protocol, /**< Protocol number to use when looking for the record, or AVAHI_PROTO_UNSPEC to look on all protocols */
398 AvahiKey *key, /**< The search key */
399 AvahiRecordBrowserCallback callback, /**< The callback to call on browsing events */
400 gpointer userdata /**< Arbitrary use suppliable data which is passed to the callback */);
402 /** Free an AvahiRecordBrowser object */
403 void avahi_record_browser_free(AvahiRecordBrowser *b);
405 /** A host name to IP adddress resolver object */
406 typedef struct AvahiHostNameResolver AvahiHostNameResolver;
408 /** Callback prototype for AvahiHostNameResolver events */
409 typedef void (*AvahiHostNameResolverCallback)(
410 AvahiHostNameResolver *r,
411 AvahiIfIndex interface,
412 AvahiProtocol protocol,
413 AvahiResolverEvent event, /**< Resolving event */
414 const gchar *host_name, /**< Host name which should be resolved. May differ in case from the query */
415 const AvahiAddress *a, /**< The address, or NULL if the host name couldn't be resolved. */
418 /** Create an AvahiHostNameResolver object for resolving a host name to an adddress. See AvahiRecordBrowser for more info on the paramters. */
419 AvahiHostNameResolver *avahi_host_name_resolver_new(
421 AvahiIfIndex interface,
422 AvahiProtocol protocol,
423 const gchar *host_name, /**< The host name to look for */
424 AvahiProtocol aprotocol, /**< The address family of the desired address or AVAHI_PROTO_UNSPEC if doesn't matter. */
425 AvahiHostNameResolverCallback calback,
428 /** Free a AvahiHostNameResolver object */
429 void avahi_host_name_resolver_free(AvahiHostNameResolver *r);
431 /** An IP address to host name resolver object ("reverse lookup") */
432 typedef struct AvahiAddressResolver AvahiAddressResolver;
434 /** Callback prototype for AvahiAddressResolver events */
435 typedef void (*AvahiAddressResolverCallback)(
436 AvahiAddressResolver *r,
437 AvahiIfIndex interface,
438 AvahiProtocol protocol,
439 AvahiResolverEvent event,
440 const AvahiAddress *a,
441 const gchar *host_name, /**< A host name for the specified address, if one was found, i.e. event == AVAHI_RESOLVER_FOUND */
444 /** Create an AvahiAddressResolver object. See AvahiRecordBrowser for more info on the paramters. */
445 AvahiAddressResolver *avahi_address_resolver_new(
447 AvahiIfIndex interface,
448 AvahiProtocol protocol,
449 const AvahiAddress *address,
450 AvahiAddressResolverCallback calback,
453 /** Free an AvahiAddressResolver object */
454 void avahi_address_resolver_free(AvahiAddressResolver *r);
456 /** The type of domain to browse for */
458 AVAHI_DOMAIN_BROWSER_REGISTER, /**< Browse for a list of available registering domains */
459 AVAHI_DOMAIN_BROWSER_REGISTER_DEFAULT, /**< Browse for the default registering domain */
460 AVAHI_DOMAIN_BROWSER_BROWSE, /**< Browse for a list of available browsing domains */
461 AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT, /**< Browse for the default browsing domain */
462 AVAHI_DOMAIN_BROWSER_BROWSE_LEGACY, /**< Legacy browse domain - see DNS-SD spec for more information */
463 AVAHI_DOMAIN_BROWSER_MAX
464 } AvahiDomainBrowserType;
466 /** A local domain browsing object. May be used to enumerate domains used on the local LAN */
467 typedef struct AvahiDomainBrowser AvahiDomainBrowser;
469 /** Callback prototype for AvahiDomainBrowser events */
470 typedef void (*AvahiDomainBrowserCallback)(
471 AvahiDomainBrowser *b,
472 AvahiIfIndex interface,
473 AvahiProtocol protocol,
474 AvahiBrowserEvent event,
478 /** Create a new AvahiDomainBrowser object */
479 AvahiDomainBrowser *avahi_domain_browser_new(
481 AvahiIfIndex interface,
482 AvahiProtocol protocol,
484 AvahiDomainBrowserType type,
485 AvahiDomainBrowserCallback callback,
488 /** Free an AvahiDomainBrowser object */
489 void avahi_domain_browser_free(AvahiDomainBrowser *b);
491 /** A DNS-SD service type browsing object. May be used to enumerate the service types of all available services on the local LAN */
492 typedef struct AvahiServiceTypeBrowser AvahiServiceTypeBrowser;
494 /** Callback prototype for AvahiServiceTypeBrowser events */
495 typedef void (*AvahiServiceTypeBrowserCallback)(
496 AvahiServiceTypeBrowser *b,
497 AvahiIfIndex interface,
498 AvahiProtocol protocol,
499 AvahiBrowserEvent event,
504 /** Create a new AvahiServiceTypeBrowser object. */
505 AvahiServiceTypeBrowser *avahi_service_type_browser_new(
507 AvahiIfIndex interface,
508 AvahiProtocol protocol,
510 AvahiServiceTypeBrowserCallback callback,
513 /** Free an AvahiServiceTypeBrowser object */
514 void avahi_service_type_browser_free(AvahiServiceTypeBrowser *b);
516 /** A DNS-SD service browser. Use this to enumerate available services of a certain kind on the local LAN. Use AvahiServiceResolver to get specific service data like address and port for a service. */
517 typedef struct AvahiServiceBrowser AvahiServiceBrowser;
519 /** Callback prototype for AvahiServiceBrowser events */
520 typedef void (*AvahiServiceBrowserCallback)(
521 AvahiServiceBrowser *b,
522 AvahiIfIndex interface,
523 AvahiProtocol protocol,
524 AvahiBrowserEvent event,
525 const gchar *name /**< Service name, e.g. "Lennart's Files" */,
526 const gchar *type /**< DNS-SD type, e.g. "_http._tcp" */,
527 const gchar *domain /**< Domain of this service, e.g. "local" */,
530 /** Create a new AvahiServiceBrowser object. */
531 AvahiServiceBrowser *avahi_service_browser_new(
533 AvahiIfIndex interface,
534 AvahiProtocol protocol,
535 const gchar *service_type /** DNS-SD service type, e.g. "_http._tcp" */,
537 AvahiServiceBrowserCallback callback,
540 /** Free an AvahiServiceBrowser object */
541 void avahi_service_browser_free(AvahiServiceBrowser *b);
543 /** A DNS-SD service resolver. Use this to retrieve addres, port and TXT data for a DNS-SD service */
544 typedef struct AvahiServiceResolver AvahiServiceResolver;
546 /** Callback prototype for AvahiServiceResolver events */
547 typedef void (*AvahiServiceResolverCallback)(
548 AvahiServiceResolver *r,
549 AvahiIfIndex interface,
550 AvahiProtocol protocol,
551 AvahiResolverEvent event,
552 const gchar *name, /**< Service name */
553 const gchar *type, /**< Service Type */
555 const gchar *host_name, /**< Host name of the service */
556 const AvahiAddress *a, /**< The resolved host name */
557 guint16 port, /**< Service name */
558 AvahiStringList *txt, /**< TXT record data */
561 /** Create a new AvahiServiceResolver object */
562 AvahiServiceResolver *avahi_service_resolver_new(
564 AvahiIfIndex interface,
565 AvahiProtocol protocol,
569 AvahiProtocol aprotocol, /**< Address family of the desired service address. Use AVAHI_PROTO_UNSPEC if you don't care */
570 AvahiServiceResolverCallback calback,
573 /** Free an AvahiServiceResolver object */
574 void avahi_service_resolver_free(AvahiServiceResolver *r);
576 /** A domain service browser object. Use this to browse for
577 * conventional unicast DNS servers which may be used to resolve
578 * conventional domain names */
579 typedef struct AvahiDNSServerBrowser AvahiDNSServerBrowser;
581 /** Callback prototype for AvahiDNSServerBrowser events */
582 typedef void (*AvahiDNSServerBrowserCallback)(
583 AvahiDNSServerBrowser *b,
584 AvahiIfIndex interface,
585 AvahiProtocol protocol,
586 AvahiBrowserEvent event,
587 const gchar *host_name, /**< Host name of the DNS server, probably useless */
588 const AvahiAddress *a, /**< Address of the DNS server */
589 guint16 port, /**< Port number of the DNS servers, probably 53 */
592 /** Create a new AvahiDNSServerBrowser object */
593 AvahiDNSServerBrowser *avahi_dns_server_browser_new(
595 AvahiIfIndex interface,
596 AvahiProtocol protocol,
598 AvahiDNSServerType type,
599 AvahiProtocol aprotocol, /**< Address protocol for the DNS server */
600 AvahiDNSServerBrowserCallback callback,
603 /** Free an AvahiDNSServerBrowser object */
604 void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b);