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 All host RRs have been withdrawn, the user should set a new host name via avahi_server_set_host_name() */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 AVAHI_ENTRY_GROUP_SLEEPING /**< Rate limiting of probe packets is active */
88 } AvahiEntryGroupState;
90 /** Prototype for callback functions which are called whenever the state of an AvahiServer object changes */
91 typedef void (*AvahiServerCallback) (AvahiServer *s, AvahiServerState state, gpointer userdata);
93 /** Prototype for callback functions which are called whenever the state of an AvahiEntryGroup object changes */
94 typedef void (*AvahiEntryGroupCallback) (AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, gpointer userdata);
96 /** Stores configuration options for a server instance */
97 typedef struct AvahiServerConfig {
98 gchar *host_name; /**< Default host name. If left empty defaults to the result of gethostname(2) of the libc */
99 gchar *domain_name; /**< Default domain name. If left empty defaults to .local */
100 gboolean use_ipv4; /**< Enable IPv4 support */
101 gboolean use_ipv6; /**< Enable IPv6 support */
102 gboolean publish_hinfo; /**< Register a HINFO record for the host containing the local OS and CPU type */
103 gboolean publish_addresses; /**< Register A, AAAA and PTR records for all local IP addresses */
104 gboolean publish_workstation; /**< Register a _workstation._tcp service */
105 gboolean publish_domain; /**< Announce the local domain for browsing */
106 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. */
107 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. */
108 gboolean enable_reflector; /**< Reflect incoming mDNS traffic to all local networks. This allows mDNS based network browsing beyond ethernet borders */
109 gboolean reflect_ipv; /**< if enable_reflector is TRUE, enable/disable reflecting between IPv4 and IPv6 */
112 /** Allocate a new mDNS responder object. */
113 AvahiServer *avahi_server_new(
114 GMainContext *c, /**< The GLIB main loop context to attach to */
115 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. */
116 AvahiServerCallback callback, /**< A callback which is called whenever the state of the server changes */
117 gpointer userdata /**< An opaque pointer which is passed to the callback function */);
119 /** Free an mDNS responder object */
120 void avahi_server_free(AvahiServer* s);
122 /** Fill in default values for a server configuration structure. If you
123 * make use of an AvahiServerConfig structure be sure to initialize
124 * it with this function for the sake of upwards library
125 * compatibility. This call may allocate strings on the heap. To
126 * release this memory make sure to call
127 * avahi_server_config_done(). If you want to replace any strings in
128 * the structure be sure to free the strings filled in by this
129 * function with g_free() first and allocate the replacements with
130 * g_malloc() (or g_strdup()).*/
131 AvahiServerConfig* avahi_server_config_init(
132 AvahiServerConfig *c /**< A structure which shall be filled in */ );
134 /** Make a deep copy of the configuration structure *c to *ret. */
135 AvahiServerConfig* avahi_server_config_copy(
136 AvahiServerConfig *ret /**< destination */,
137 const AvahiServerConfig *c /**< source */);
139 /** Free the data in a server configuration structure. */
140 void avahi_server_config_free(AvahiServerConfig *c);
142 /** Return the currently chosen domain name of the server object. The
143 * return value points to an internally allocated string. Be sure to
144 * make a copy of the string before calling any other library
146 const gchar* avahi_server_get_domain_name(AvahiServer *s);
148 /** Return the currently chosen host name. The return value points to a internally allocated string. */
149 const gchar* avahi_server_get_host_name(AvahiServer *s);
151 /** Return the currently chosen host name as a FQDN ("fully qualified
152 * domain name", i.e. the concatenation of the host and domain
153 * name). The return value points to a internally allocated string. */
154 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s);
156 /** Change the host name of a running mDNS responder. This will drop
157 all automicatilly generated RRs and readd them with the new
158 name. Since the responder has to probe for the new RRs this function
159 takes some time to take effect altough it returns immediately. This
160 function is intended to be called when a host name conflict is
161 reported using AvahiServerCallback. The caller should readd all user
162 defined RRs too since they otherwise continue to point to the outdated
164 gint avahi_server_set_host_name(AvahiServer *s, const gchar *host_name);
166 /** Change the domain name of a running mDNS responder. The same rules
167 * as with avahi_server_set_host_name() apply. */
168 gint avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name);
170 /** Return the opaque user data pointer attached to a server object */
171 gpointer avahi_server_get_data(AvahiServer *s);
173 /** Change the opaque user data pointer attached to a server object */
174 void avahi_server_set_data(AvahiServer *s, gpointer userdata);
176 /** Return the current state of the server object */
177 AvahiServerState avahi_server_get_state(AvahiServer *s);
179 /** Iterate through all local entries of the server. (when g is NULL)
180 * or of a specified entry group. At the first call state should point
181 * to a NULL initialized void pointer, That pointer is used to track
182 * the current iteration. It is not safe to call any other
183 * avahi_server_xxx() function during the iteration. If the last entry
184 * has been read, NULL is returned. */
185 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state);
187 /** Callback prototype for avahi_server_dump() */
188 typedef void (*AvahiDumpCallback)(const gchar *text, gpointer userdata);
190 /** Dump the current server status by calling "callback" for each line. */
191 void avahi_server_dump(AvahiServer *s, AvahiDumpCallback callback, gpointer userdata);
193 /** Create a new entry group. The specified callback function is
194 * called whenever the state of the group changes. Use entry group
195 * objects to keep track of you RRs. Add new RRs to a group using
196 * avahi_server_add_xxx(). Make sure to call avahi_entry_group_commit()
197 * to start the registration process for your RRs */
198 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata);
200 /** Free an entry group. All RRs assigned to the group are removed from the server */
201 void avahi_entry_group_free(AvahiEntryGroup *g);
203 /** Commit an entry group. This starts the probing and registration process for all RRs in the group */
204 gint avahi_entry_group_commit(AvahiEntryGroup *g);
206 /** Remove all entries from the entry group and reset the state to AVAHI_ENTRY_GROUP_UNCOMMITED. */
207 void avahi_entry_group_reset(AvahiEntryGroup *g);
209 /** Return TRUE if the entry group is empty, i.e. has no records attached. */
210 gboolean avahi_entry_group_is_empty(AvahiEntryGroup *g);
212 /** Return the current state of the specified entry group */
213 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g);
215 /** Change the opaque user data pointer attached to an entry group object */
216 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata);
218 /** Return the opaque user data pointer currently set for the entry group object */
219 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g);
221 /** Add a new resource record to the server. Returns 0 on success, negative otherwise. */
222 gint avahi_server_add(
223 AvahiServer *s, /**< The server object to add this record to */
224 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. */
225 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 */
226 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). */
227 AvahiEntryFlags flags, /**< Special flags for this record */
228 AvahiRecord *r /**< The record to add. This function increases the reference counter of this object. */ );
230 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
231 gint avahi_server_add_ptr(
234 AvahiIfIndex interface,
235 AvahiProtocol protocol,
236 AvahiEntryFlags flags,
237 guint32 ttl, /**< DNS TTL for this record */
238 const gchar *name, /**< PTR record name */
239 const gchar *dest /**< pointer destination */ );
241 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
242 gint avahi_server_add_txt(
245 AvahiIfIndex interface,
246 AvahiProtocol protocol,
247 AvahiEntryFlags flags,
248 guint32 ttl, /**< DNS TTL for this record */
249 const gchar *name, /**< TXT record name */
250 ... /**< Text record data, terminated by NULL */);
252 /** Add a PTR RR to the server. Mostly identical to
253 * avahi_server_add_text but takes a va_list instead of a variable
254 * number of arguments */
255 gint avahi_server_add_txt_va(
258 AvahiIfIndex interface,
259 AvahiProtocol protocol,
260 AvahiEntryFlags flags,
265 /** Add a PTR RR to the server. Mostly identical to
266 * avahi_server_add_text but takes an AvahiStringList record instead of a variable
267 * number of arguments. */
268 gint avahi_server_add_txt_strlst(
271 AvahiIfIndex interface,
272 AvahiProtocol protocol,
273 AvahiEntryFlags flags,
276 AvahiStringList *strlst /**< TXT decord data as a AvahiString. This routine makes a deep copy of this object. */ );
278 /** Add an IP address mapping to the server. This will add both the
279 * host-name-to-address and the reverse mapping to the server. See
280 * avahi_server_add() for more information. If adding one of the RRs
281 * fails, the function returns with an error, but it is not defined if
282 * the other RR is deleted from the server or not. Therefore, you have
283 * to free the AvahiEntryGroup and create a new one before
285 gint avahi_server_add_address(
288 AvahiIfIndex interface,
289 AvahiProtocol protocol,
290 AvahiEntryFlags flags,
294 /** Add an DNS-SD service to the Server. This will add all required
295 * RRs to the server. See avahi_server_add() for more information. If
296 * adding one of the RRs fails, the function returns with an error,
297 * but it is not defined if the other RR is deleted from the server or
298 * not. Therefore, you have to free the AvahiEntryGroup and create a
299 * new one before proceeding. */
300 gint avahi_server_add_service(
303 AvahiIfIndex interface,
304 AvahiProtocol protocol,
305 const gchar *name, /**< Service name, e.g. "Lennart's Files" */
306 const gchar *type, /**< DNS-SD type, e.g. "_http._tcp" */
308 const gchar *host, /**< Host name where this servcie resides, or NULL if on the local host */
309 guint16 port, /**< Port number of the service */
310 ... /**< Text records, terminated by NULL */);
312 /** Mostly identical to avahi_server_add_service(), but takes an va_list for the TXT records. */
313 gint avahi_server_add_service_va(
316 AvahiIfIndex interface,
317 AvahiProtocol protocol,
325 /** Mostly identical to avahi_server_add_service(), but takes an AvahiStringList object for the TXT records. The AvahiStringList object is copied. */
326 gint avahi_server_add_service_strlst(
329 AvahiIfIndex interface,
330 AvahiProtocol protocol,
336 AvahiStringList *strlst);
338 /** The type of DNS server */
340 AVAHI_DNS_SERVER_RESOLVE, /**< Unicast DNS servers for normal resolves (_domain._udp)*/
341 AVAHI_DNS_SERVER_UPDATE /**< Unicast DNS servers for updates (_dns-update._udp)*/
342 } AvahiDNSServerType;
344 /** Publish the specified unicast DNS server address via mDNS. You may
345 * browse for records create this way wit
346 * avahi_dns_server_browser_new(). */
347 gint avahi_server_add_dns_server_address(
350 AvahiIfIndex interface,
351 AvahiProtocol protocol,
353 AvahiDNSServerType type,
354 const AvahiAddress *address,
355 guint16 port /** should be 53 */);
357 /** Similar to avahi_server_add_dns_server_address(), but specify a
358 host name instead of an address. The specified host name should be
359 resolvable via mDNS */
360 gint avahi_server_add_dns_server_name(
363 AvahiIfIndex interface,
364 AvahiProtocol protocol,
366 AvahiDNSServerType type,
368 guint16 port /** should be 53 */);
370 /** Type of callback event when browsing */
372 AVAHI_BROWSER_NEW = 0, /**< The object is new on the network */
373 AVAHI_BROWSER_REMOVE = -1 /**< The object has been removed from the network */
376 /** Type of callback event when resolving */
378 AVAHI_RESOLVER_FOUND = 0, /**< RR found, resolving successful */
379 AVAHI_RESOLVER_TIMEOUT = -1 /**< Noone responded within the timeout, resolving failed */
380 } AvahiResolverEvent;
382 /** A browsing object for arbitrary RRs */
383 typedef struct AvahiRecordBrowser AvahiRecordBrowser;
385 /** Callback prototype for AvahiRecordBrowser events */
386 typedef void (*AvahiRecordBrowserCallback)(
387 AvahiRecordBrowser *b, /**< The AvahiRecordBrowser object that is emitting this callback */
388 AvahiIfIndex interface, /**< Logical OS network interface number the record was found on */
389 AvahiProtocol protocol, /**< Protocol number the record was found. */
390 AvahiBrowserEvent event, /**< Browsing event, either AVAHI_BROWSER_NEW or AVAHI_BROWSER_REMOVE */
391 AvahiRecord *record, /**< The record that was found */
392 gpointer userdata /**< Arbitrary user data passed to avahi_record_browser_new() */ );
394 /** Create a new browsing object for arbitrary RRs */
395 AvahiRecordBrowser *avahi_record_browser_new(
396 AvahiServer *server, /**< The server object to which attach this query */
397 AvahiIfIndex interface, /**< Logical OS interface number where to look for the records, or AVAHI_IF_UNSPEC to look on interfaces */
398 AvahiProtocol protocol, /**< Protocol number to use when looking for the record, or AVAHI_PROTO_UNSPEC to look on all protocols */
399 AvahiKey *key, /**< The search key */
400 AvahiRecordBrowserCallback callback, /**< The callback to call on browsing events */
401 gpointer userdata /**< Arbitrary use suppliable data which is passed to the callback */);
403 /** Free an AvahiRecordBrowser object */
404 void avahi_record_browser_free(AvahiRecordBrowser *b);
406 /** A host name to IP adddress resolver object */
407 typedef struct AvahiHostNameResolver AvahiHostNameResolver;
409 /** Callback prototype for AvahiHostNameResolver events */
410 typedef void (*AvahiHostNameResolverCallback)(
411 AvahiHostNameResolver *r,
412 AvahiIfIndex interface,
413 AvahiProtocol protocol,
414 AvahiResolverEvent event, /**< Resolving event */
415 const gchar *host_name, /**< Host name which should be resolved. May differ in case from the query */
416 const AvahiAddress *a, /**< The address, or NULL if the host name couldn't be resolved. */
419 /** Create an AvahiHostNameResolver object for resolving a host name to an adddress. See AvahiRecordBrowser for more info on the paramters. */
420 AvahiHostNameResolver *avahi_host_name_resolver_new(
422 AvahiIfIndex interface,
423 AvahiProtocol protocol,
424 const gchar *host_name, /**< The host name to look for */
425 AvahiProtocol aprotocol, /**< The address family of the desired address or AVAHI_PROTO_UNSPEC if doesn't matter. */
426 AvahiHostNameResolverCallback calback,
429 /** Free a AvahiHostNameResolver object */
430 void avahi_host_name_resolver_free(AvahiHostNameResolver *r);
432 /** An IP address to host name resolver object ("reverse lookup") */
433 typedef struct AvahiAddressResolver AvahiAddressResolver;
435 /** Callback prototype for AvahiAddressResolver events */
436 typedef void (*AvahiAddressResolverCallback)(
437 AvahiAddressResolver *r,
438 AvahiIfIndex interface,
439 AvahiProtocol protocol,
440 AvahiResolverEvent event,
441 const AvahiAddress *a,
442 const gchar *host_name, /**< A host name for the specified address, if one was found, i.e. event == AVAHI_RESOLVER_FOUND */
445 /** Create an AvahiAddressResolver object. See AvahiRecordBrowser for more info on the paramters. */
446 AvahiAddressResolver *avahi_address_resolver_new(
448 AvahiIfIndex interface,
449 AvahiProtocol protocol,
450 const AvahiAddress *address,
451 AvahiAddressResolverCallback calback,
454 /** Free an AvahiAddressResolver object */
455 void avahi_address_resolver_free(AvahiAddressResolver *r);
457 /** The type of domain to browse for */
459 AVAHI_DOMAIN_BROWSER_REGISTER, /**< Browse for a list of available registering domains */
460 AVAHI_DOMAIN_BROWSER_REGISTER_DEFAULT, /**< Browse for the default registering domain */
461 AVAHI_DOMAIN_BROWSER_BROWSE, /**< Browse for a list of available browsing domains */
462 AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT, /**< Browse for the default browsing domain */
463 AVAHI_DOMAIN_BROWSER_BROWSE_LEGACY, /**< Legacy browse domain - see DNS-SD spec for more information */
464 AVAHI_DOMAIN_BROWSER_MAX
465 } AvahiDomainBrowserType;
467 /** A local domain browsing object. May be used to enumerate domains used on the local LAN */
468 typedef struct AvahiDomainBrowser AvahiDomainBrowser;
470 /** Callback prototype for AvahiDomainBrowser events */
471 typedef void (*AvahiDomainBrowserCallback)(
472 AvahiDomainBrowser *b,
473 AvahiIfIndex interface,
474 AvahiProtocol protocol,
475 AvahiBrowserEvent event,
479 /** Create a new AvahiDomainBrowser object */
480 AvahiDomainBrowser *avahi_domain_browser_new(
482 AvahiIfIndex interface,
483 AvahiProtocol protocol,
485 AvahiDomainBrowserType type,
486 AvahiDomainBrowserCallback callback,
489 /** Free an AvahiDomainBrowser object */
490 void avahi_domain_browser_free(AvahiDomainBrowser *b);
492 /** A DNS-SD service type browsing object. May be used to enumerate the service types of all available services on the local LAN */
493 typedef struct AvahiServiceTypeBrowser AvahiServiceTypeBrowser;
495 /** Callback prototype for AvahiServiceTypeBrowser events */
496 typedef void (*AvahiServiceTypeBrowserCallback)(
497 AvahiServiceTypeBrowser *b,
498 AvahiIfIndex interface,
499 AvahiProtocol protocol,
500 AvahiBrowserEvent event,
505 /** Create a new AvahiServiceTypeBrowser object. */
506 AvahiServiceTypeBrowser *avahi_service_type_browser_new(
508 AvahiIfIndex interface,
509 AvahiProtocol protocol,
511 AvahiServiceTypeBrowserCallback callback,
514 /** Free an AvahiServiceTypeBrowser object */
515 void avahi_service_type_browser_free(AvahiServiceTypeBrowser *b);
517 /** 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. */
518 typedef struct AvahiServiceBrowser AvahiServiceBrowser;
520 /** Callback prototype for AvahiServiceBrowser events */
521 typedef void (*AvahiServiceBrowserCallback)(
522 AvahiServiceBrowser *b,
523 AvahiIfIndex interface,
524 AvahiProtocol protocol,
525 AvahiBrowserEvent event,
526 const gchar *name /**< Service name, e.g. "Lennart's Files" */,
527 const gchar *type /**< DNS-SD type, e.g. "_http._tcp" */,
528 const gchar *domain /**< Domain of this service, e.g. "local" */,
531 /** Create a new AvahiServiceBrowser object. */
532 AvahiServiceBrowser *avahi_service_browser_new(
534 AvahiIfIndex interface,
535 AvahiProtocol protocol,
536 const gchar *service_type /** DNS-SD service type, e.g. "_http._tcp" */,
538 AvahiServiceBrowserCallback callback,
541 /** Free an AvahiServiceBrowser object */
542 void avahi_service_browser_free(AvahiServiceBrowser *b);
544 /** A DNS-SD service resolver. Use this to retrieve addres, port and TXT data for a DNS-SD service */
545 typedef struct AvahiServiceResolver AvahiServiceResolver;
547 /** Callback prototype for AvahiServiceResolver events */
548 typedef void (*AvahiServiceResolverCallback)(
549 AvahiServiceResolver *r,
550 AvahiIfIndex interface,
551 AvahiProtocol protocol,
552 AvahiResolverEvent event,
553 const gchar *name, /**< Service name */
554 const gchar *type, /**< Service Type */
556 const gchar *host_name, /**< Host name of the service */
557 const AvahiAddress *a, /**< The resolved host name */
558 guint16 port, /**< Service name */
559 AvahiStringList *txt, /**< TXT record data */
562 /** Create a new AvahiServiceResolver object */
563 AvahiServiceResolver *avahi_service_resolver_new(
565 AvahiIfIndex interface,
566 AvahiProtocol protocol,
570 AvahiProtocol aprotocol, /**< Address family of the desired service address. Use AVAHI_PROTO_UNSPEC if you don't care */
571 AvahiServiceResolverCallback calback,
574 /** Free an AvahiServiceResolver object */
575 void avahi_service_resolver_free(AvahiServiceResolver *r);
577 /** A domain service browser object. Use this to browse for
578 * conventional unicast DNS servers which may be used to resolve
579 * conventional domain names */
580 typedef struct AvahiDNSServerBrowser AvahiDNSServerBrowser;
582 /** Callback prototype for AvahiDNSServerBrowser events */
583 typedef void (*AvahiDNSServerBrowserCallback)(
584 AvahiDNSServerBrowser *b,
585 AvahiIfIndex interface,
586 AvahiProtocol protocol,
587 AvahiBrowserEvent event,
588 const gchar *host_name, /**< Host name of the DNS server, probably useless */
589 const AvahiAddress *a, /**< Address of the DNS server */
590 guint16 port, /**< Port number of the DNS servers, probably 53 */
593 /** Create a new AvahiDNSServerBrowser object */
594 AvahiDNSServerBrowser *avahi_dns_server_browser_new(
596 AvahiIfIndex interface,
597 AvahiProtocol protocol,
599 AvahiDNSServerType type,
600 AvahiProtocol aprotocol, /**< Address protocol for the DNS server */
601 AvahiDNSServerBrowserCallback callback,
604 /** Free an AvahiDNSServerBrowser object */
605 void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b);