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
28 /** \file core.h The Avahi Multicast DNS and DNS Service Discovery implmentation. */
30 #include <avahi-common/cdecl.h>
34 /** An mDNS responder object */
35 typedef struct AvahiServer AvahiServer;
37 /** A locally registered DNS resource record */
38 typedef struct AvahiEntry AvahiEntry;
40 /** A group of locally registered DNS RRs */
41 typedef struct AvahiEntryGroup AvahiEntryGroup;
45 #include <avahi-common/address.h>
46 #include <avahi-common/rr.h>
47 #include <avahi-common/alternative.h>
51 /** States of a server object */
53 AVAHI_SERVER_INVALID = -1, /**< Invalid state (initial) */
54 AVAHI_SERVER_REGISTERING = 0, /**< Host RRs are being registered */
55 AVAHI_SERVER_RUNNING, /**< All host RRs have been established */
56 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 All host RRs have been withdrawn, the user should set a new host name via avahi_server_set_host_name() */
57 AVAHI_SERVER_SLEEPING /**< The host or domain name has changed and the server waits for old entries to be expired */
60 /** Flags for server entries */
62 AVAHI_ENTRY_NULL = 0, /**< No special flags */
63 AVAHI_ENTRY_UNIQUE = 1, /**< The RRset is intended to be unique */
64 AVAHI_ENTRY_NOPROBE = 2, /**< Though the RRset is intended to be unique no probes shall be sent */
65 AVAHI_ENTRY_NOANNOUNCE = 4, /**< Do not announce this RR to other hosts */
66 AVAHI_ENTRY_ALLOWMUTIPLE = 8 /**< Allow multiple local records of this type, even if they are intended to be unique */
69 /** States of an entry group object */
71 AVAHI_ENTRY_GROUP_UNCOMMITED = -1, /**< The group has not yet been commited, the user must still call avahi_entry_group_commit() */
72 AVAHI_ENTRY_GROUP_REGISTERING = 0, /**< The entries of the group are currently being registered */
73 AVAHI_ENTRY_GROUP_ESTABLISHED, /**< The entries have successfully been established */
74 AVAHI_ENTRY_GROUP_COLLISION /**< A name collision for one of the entries in the group has been detected, the entries have been withdrawn */
75 } AvahiEntryGroupState;
77 /** Prototype for callback functions which are called whenever the state of an AvahiServer object changes */
78 typedef void (*AvahiServerCallback) (AvahiServer *s, AvahiServerState state, gpointer userdata);
80 /** Prototype for callback functions which are called whenever the state of an AvahiEntryGroup object changes */
81 typedef void (*AvahiEntryGroupCallback) (AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, gpointer userdata);
83 /** Stores configuration options for a server instance */
84 typedef struct AvahiServerConfig {
85 gchar *host_name; /**< Default host name. If left empty defaults to the result of gethostname(2) of the libc */
86 gchar *domain_name; /**< Default domain name. If left empty defaults to .local */
87 gboolean use_ipv4; /**< Enable IPv4 support */
88 gboolean use_ipv6; /**< Enable IPv6 support */
89 gboolean publish_hinfo; /**< Register a HINFO record for the host containing the local OS and CPU type */
90 gboolean publish_addresses; /**< Register A, AAAA and PTR records for all local IP addresses */
91 gboolean publish_workstation; /**< Register a _workstation._tcp service */
92 gboolean publish_domain; /**< Announce the local domain for browsing */
93 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. */
94 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. */
95 gboolean enable_reflector; /**< Reflect incoming mDNS traffic to all local networks. This allows mDNS based network browsing beyond ethernet borders */
96 gboolean reflect_ipv; /**< if enable_reflector is TRUE, enable/disable reflecting between IPv4 and IPv6 */
99 /** Allocate a new mDNS responder object. */
100 AvahiServer *avahi_server_new(
101 GMainContext *c, /**< The GLIB main loop context to attach to */
102 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. */
103 AvahiServerCallback callback, /**< A callback which is called whenever the state of the server changes */
104 gpointer userdata /**< An opaque pointer which is passed to the callback function */);
106 /** Free an mDNS responder object */
107 void avahi_server_free(AvahiServer* s);
109 /** Fill in default values for a server configuration structure. If you
110 * make use of an AvahiServerConfig structure be sure to initialize
111 * it with this function for the sake of upwards library
112 * compatibility. This call may allocate strings on the heap. To
113 * release this memory make sure to call
114 * avahi_server_config_done(). If you want to replace any strings in
115 * the structure be sure to free the strings filled in by this
116 * function with g_free() first and allocate the replacements with
117 * g_malloc() (or g_strdup()).*/
118 AvahiServerConfig* avahi_server_config_init(
119 AvahiServerConfig *c /**< A structure which shall be filled in */ );
121 /** Make a deep copy of the configuration structure *c to *ret. */
122 AvahiServerConfig* avahi_server_config_copy(
123 AvahiServerConfig *ret /**< destination */,
124 const AvahiServerConfig *c /**< source */);
126 /** Free the data in a server configuration structure. */
127 void avahi_server_config_free(AvahiServerConfig *c);
129 /** Return the currently chosen domain name of the server object. The
130 * return value points to an internally allocated string. Be sure to
131 * make a copy of the string before calling any other library
133 const gchar* avahi_server_get_domain_name(AvahiServer *s);
135 /** Return the currently chosen host name. The return value points to a internally allocated string. */
136 const gchar* avahi_server_get_host_name(AvahiServer *s);
138 /** Return the currently chosen host name as a FQDN ("fully qualified
139 * domain name", i.e. the concatenation of the host and domain
140 * name). The return value points to a internally allocated string. */
141 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s);
143 /** Change the host name of a running mDNS responder. This will drop
144 all automicatilly generated RRs and readd them with the new
145 name. Since the responder has to probe for the new RRs this function
146 takes some time to take effect altough it returns immediately. This
147 function is intended to be called when a host name conflict is
148 reported using AvahiServerCallback. The caller should readd all user
149 defined RRs too since they otherwise continue to point to the outdated
151 gint avahi_server_set_host_name(AvahiServer *s, const gchar *host_name);
153 /** Change the domain name of a running mDNS responder. The same rules
154 * as with avahi_server_set_host_name() apply. */
155 gint avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name);
157 /** Return the opaque user data pointer attached to a server object */
158 gpointer avahi_server_get_data(AvahiServer *s);
160 /** Change the opaque user data pointer attached to a server object */
161 void avahi_server_set_data(AvahiServer *s, gpointer userdata);
163 /** Return the current state of the server object */
164 AvahiServerState avahi_server_get_state(AvahiServer *s);
166 /** Iterate through all local entries of the server. (when g is NULL)
167 * or of a specified entry group. At the first call state should point
168 * to a NULL initialized void pointer, That pointer is used to track
169 * the current iteration. It is not safe to call any other
170 * avahi_server_xxx() function during the iteration. If the last entry
171 * has been read, NULL is returned. */
172 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state);
174 /** Callback prototype for avahi_server_dump() */
175 typedef void (*AvahiDumpCallback)(const gchar *text, gpointer userdata);
177 /** Dump the current server status by calling "callback" for each line. */
178 void avahi_server_dump(AvahiServer *s, AvahiDumpCallback callback, gpointer userdata);
180 /** Create a new entry group. The specified callback function is
181 * called whenever the state of the group changes. Use entry group
182 * objects to keep track of you RRs. Add new RRs to a group using
183 * avahi_server_add_xxx(). Make sure to call avahi_entry_group_commit()
184 * to start the registration process for your RRs */
185 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata);
187 /** Free an entry group. All RRs assigned to the group are removed from the server */
188 void avahi_entry_group_free(AvahiEntryGroup *g);
190 /** Commit an entry group. This starts the probing and registration process for all RRs in the group */
191 gint avahi_entry_group_commit(AvahiEntryGroup *g);
193 /** Return the current state of the specified entry group */
194 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g);
196 /** Change the opaque user data pointer attached to an entry group object */
197 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata);
199 /** Return the opaque user data pointer currently set for the entry group object */
200 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g);
202 /** Add a new resource record to the server. Returns 0 on success, negative otherwise. */
203 gint avahi_server_add(
204 AvahiServer *s, /**< The server object to add this record to */
205 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. */
206 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 */
207 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). */
208 AvahiEntryFlags flags, /**< Special flags for this record */
209 AvahiRecord *r /**< The record to add. This function increases the reference counter of this object. */ );
211 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
212 gint avahi_server_add_ptr(
215 AvahiIfIndex interface,
216 AvahiProtocol protocol,
217 AvahiEntryFlags flags,
218 guint32 ttl, /**< DNS TTL for this record */
219 const gchar *name, /**< PTR record name */
220 const gchar *dest /**< pointer destination */ );
222 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
223 gint avahi_server_add_txt(
226 AvahiIfIndex interface,
227 AvahiProtocol protocol,
228 AvahiEntryFlags flags,
229 guint32 ttl, /**< DNS TTL for this record */
230 const gchar *name, /**< TXT record name */
231 ... /**< Text record data, terminated by NULL */);
233 /** Add a PTR RR to the server. Mostly identical to
234 * avahi_server_add_text but takes a va_list instead of a variable
235 * number of arguments */
236 gint avahi_server_add_txt_va(
239 AvahiIfIndex interface,
240 AvahiProtocol protocol,
241 AvahiEntryFlags flags,
246 /** Add a PTR RR to the server. Mostly identical to
247 * avahi_server_add_text but takes an AvahiStringList record instead of a variable
248 * number of arguments. */
249 gint avahi_server_add_txt_strlst(
252 AvahiIfIndex interface,
253 AvahiProtocol protocol,
254 AvahiEntryFlags flags,
257 AvahiStringList *strlst /**< TXT decord data as a AvahiString. Only the pointer to the object and not the object itself is copied into the RR. Therefore you should not free the strlst object yourself, this will be done by the library. If you want to add multiple records with the same RR data you MUST copy the strlst object prior to calling this function with avahi_strlst_copy(). */ );
259 /** Add an IP address mapping to the server. This will add both the
260 * host-name-to-address and the reverse mapping to the server. See
261 * avahi_server_add() for more information. If adding one of the RRs
262 * fails, the function returns with an error, but it is not defined if
263 * the other RR is deleted from the server or not. Therefore, you have
264 * to free the AvahiEntryGroup and create a new one before
266 gint avahi_server_add_address(
269 AvahiIfIndex interface,
270 AvahiProtocol protocol,
271 AvahiEntryFlags flags,
275 /** Add an DNS-SD service to the Server. This will add all required
276 * RRs to the server. See avahi_server_add() for more information. If
277 * adding one of the RRs fails, the function returns with an error,
278 * but it is not defined if the other RR is deleted from the server or
279 * not. Therefore, you have to free the AvahiEntryGroup and create a
280 * new one before proceeding. */
281 gint avahi_server_add_service(
284 AvahiIfIndex interface,
285 AvahiProtocol protocol,
286 const gchar *name, /**< Service name, e.g. "Lennart's Files" */
287 const gchar *type, /**< DNS-SD type, e.g. "_http._tcp" */
289 const gchar *host, /**< Host name where this servcie resides, or NULL if on the local host */
290 guint16 port, /**< Port number of the service */
291 ... /**< Text records, terminated by NULL */);
293 /** Mostly identical to avahi_server_add_service(), but takes an va_list for the TXT records. */
294 gint avahi_server_add_service_va(
297 AvahiIfIndex interface,
298 AvahiProtocol protocol,
306 /** Mostly identical to avahi_server_add_service(), but takes an AvahiStringList object for the TXT records. The AvahiStringList object is not copied. You need to make a copy if this object if you want to reuse it. The object is freed if the RR is removed from the server. */
307 gint avahi_server_add_service_strlst(
310 AvahiIfIndex interface,
311 AvahiProtocol protocol,
317 AvahiStringList *strlst);
319 /** The type of DNS server */
321 AVAHI_DNS_SERVER_RESOLVE, /**< Unicast DNS servers for normal resolves (_domain._udp)*/
322 AVAHI_DNS_SERVER_UPDATE /**< Unicast DNS servers for updates (_dns-update._udp)*/
323 } AvahiDNSServerType;
325 /** Publish the specified unicast DNS server address via mDNS. You may
326 * browse for records create this way wit
327 * avahi_dns_server_browser_new(). */
328 gint avahi_server_add_dns_server_address(
331 AvahiIfIndex interface,
332 AvahiProtocol protocol,
334 AvahiDNSServerType type,
335 const AvahiAddress *address,
336 guint16 port /** should be 53 */);
338 /** Similar to avahi_server_add_dns_server_address(), but specify a
339 host name instead of an address. The specified host name should be
340 resolvable via mDNS */
341 gint avahi_server_add_dns_server_name(
344 AvahiIfIndex interface,
345 AvahiProtocol protocol,
347 AvahiDNSServerType type,
349 guint16 port /** should be 53 */);
351 /** Type of callback event when browsing */
353 AVAHI_BROWSER_NEW = 0, /**< The object is new on the network */
354 AVAHI_BROWSER_REMOVE = -1 /**< The object has been removed from the network */
357 /** Type of callback event when resolving */
359 AVAHI_RESOLVER_FOUND = 0, /**< RR found, resolving successful */
360 AVAHI_RESOLVER_TIMEOUT = -1 /**< Noone responded within the timeout, resolving failed */
361 } AvahiResolverEvent;
363 /** A browsing object for arbitrary RRs */
364 typedef struct AvahiRecordBrowser AvahiRecordBrowser;
366 /** Callback prototype for AvahiRecordBrowser events */
367 typedef void (*AvahiRecordBrowserCallback)(
368 AvahiRecordBrowser *b, /**< The AvahiRecordBrowser object that is emitting this callback */
369 AvahiIfIndex interface, /**< Logical OS network interface number the record was found on */
370 AvahiProtocol protocol, /**< Protocol number the record was found. */
371 AvahiBrowserEvent event, /**< Browsing event, either AVAHI_BROWSER_NEW or AVAHI_BROWSER_REMOVE */
372 AvahiRecord *record, /**< The record that was found */
373 gpointer userdata /**< Arbitrary user data passed to avahi_record_browser_new() */ );
375 /** Create a new browsing object for arbitrary RRs */
376 AvahiRecordBrowser *avahi_record_browser_new(
377 AvahiServer *server, /**< The server object to which attach this query */
378 AvahiIfIndex interface, /**< Logical OS interface number where to look for the records, or AVAHI_IF_UNSPEC to look on interfaces */
379 AvahiProtocol protocol, /**< Protocol number to use when looking for the record, or AVAHI_PROTO_UNSPEC to look on all protocols */
380 AvahiKey *key, /**< The search key */
381 AvahiRecordBrowserCallback callback, /**< The callback to call on browsing events */
382 gpointer userdata /**< Arbitrary use suppliable data which is passed to the callback */);
384 /** Free an AvahiRecordBrowser object */
385 void avahi_record_browser_free(AvahiRecordBrowser *b);
387 /** A host name to IP adddress resolver object */
388 typedef struct AvahiHostNameResolver AvahiHostNameResolver;
390 /** Callback prototype for AvahiHostNameResolver events */
391 typedef void (*AvahiHostNameResolverCallback)(
392 AvahiHostNameResolver *r,
393 AvahiIfIndex interface,
394 AvahiProtocol protocol,
395 AvahiResolverEvent event, /**< Resolving event */
396 const gchar *host_name, /**< Host name which should be resolved. May differ in case from the query */
397 const AvahiAddress *a, /**< The address, or NULL if the host name couldn't be resolved. */
400 /** Create an AvahiHostNameResolver object for resolving a host name to an adddress. See AvahiRecordBrowser for more info on the paramters. */
401 AvahiHostNameResolver *avahi_host_name_resolver_new(
403 AvahiIfIndex interface,
404 AvahiProtocol protocol,
405 const gchar *host_name, /**< The host name to look for */
406 AvahiProtocol aprotocol, /**< The address family of the desired address or AVAHI_PROTO_UNSPEC if doesn't matter. */
407 AvahiHostNameResolverCallback calback,
410 /** Free a AvahiHostNameResolver object */
411 void avahi_host_name_resolver_free(AvahiHostNameResolver *r);
413 /** An IP address to host name resolver object ("reverse lookup") */
414 typedef struct AvahiAddressResolver AvahiAddressResolver;
416 /** Callback prototype for AvahiAddressResolver events */
417 typedef void (*AvahiAddressResolverCallback)(
418 AvahiAddressResolver *r,
419 AvahiIfIndex interface,
420 AvahiProtocol protocol,
421 AvahiResolverEvent event,
422 const AvahiAddress *a,
423 const gchar *host_name, /**< A host name for the specified address, if one was found, i.e. event == AVAHI_RESOLVER_FOUND */
426 /** Create an AvahiAddressResolver object. See AvahiRecordBrowser for more info on the paramters. */
427 AvahiAddressResolver *avahi_address_resolver_new(
429 AvahiIfIndex interface,
430 AvahiProtocol protocol,
431 const AvahiAddress *address,
432 AvahiAddressResolverCallback calback,
435 /** Free an AvahiAddressResolver object */
436 void avahi_address_resolver_free(AvahiAddressResolver *r);
438 /** The type of domain to browse for */
440 AVAHI_DOMAIN_BROWSER_REGISTER, /**< Browse for a list of available registering domains */
441 AVAHI_DOMAIN_BROWSER_REGISTER_DEFAULT, /**< Browse for the default registering domain */
442 AVAHI_DOMAIN_BROWSER_BROWSE, /**< Browse for a list of available browsing domains */
443 AVAHI_DOMAIN_BROWSER_BROWSE_DEFAULT, /**< Browse for the default browsing domain */
444 AVAHI_DOMAIN_BROWSER_BROWSE_LEGACY, /**< Legacy browse domain - see DNS-SD spec for more information */
445 AVAHI_DOMAIN_BROWSER_MAX
446 } AvahiDomainBrowserType;
448 /** A local domain browsing object. May be used to enumerate domains used on the local LAN */
449 typedef struct AvahiDomainBrowser AvahiDomainBrowser;
451 /** Callback prototype for AvahiDomainBrowser events */
452 typedef void (*AvahiDomainBrowserCallback)(
453 AvahiDomainBrowser *b,
454 AvahiIfIndex interface,
455 AvahiProtocol protocol,
456 AvahiBrowserEvent event,
460 /** Create a new AvahiDomainBrowser object */
461 AvahiDomainBrowser *avahi_domain_browser_new(
463 AvahiIfIndex interface,
464 AvahiProtocol protocol,
466 AvahiDomainBrowserType type,
467 AvahiDomainBrowserCallback callback,
470 /** Free an AvahiDomainBrowser object */
471 void avahi_domain_browser_free(AvahiDomainBrowser *b);
473 /** A DNS-SD service type browsing object. May be used to enumerate the service types of all available services on the local LAN */
474 typedef struct AvahiServiceTypeBrowser AvahiServiceTypeBrowser;
476 /** Callback prototype for AvahiServiceTypeBrowser events */
477 typedef void (*AvahiServiceTypeBrowserCallback)(
478 AvahiServiceTypeBrowser *b,
479 AvahiIfIndex interface,
480 AvahiProtocol protocol,
481 AvahiBrowserEvent event,
486 /** Create a new AvahiServiceTypeBrowser object. */
487 AvahiServiceTypeBrowser *avahi_service_type_browser_new(
489 AvahiIfIndex interface,
490 AvahiProtocol protocol,
492 AvahiServiceTypeBrowserCallback callback,
495 /** Free an AvahiServiceTypeBrowser object */
496 void avahi_service_type_browser_free(AvahiServiceTypeBrowser *b);
498 /** 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. */
499 typedef struct AvahiServiceBrowser AvahiServiceBrowser;
501 /** Callback prototype for AvahiServiceBrowser events */
502 typedef void (*AvahiServiceBrowserCallback)(
503 AvahiServiceBrowser *b,
504 AvahiIfIndex interface,
505 AvahiProtocol protocol,
506 AvahiBrowserEvent event,
507 const gchar *name /**< Service name, e.g. "Lennart's Files" */,
508 const gchar *type /**< DNS-SD type, e.g. "_http._tcp" */,
509 const gchar *domain /**< Domain of this service, e.g. "local" */,
512 /** Create a new AvahiServiceBrowser object. */
513 AvahiServiceBrowser *avahi_service_browser_new(
515 AvahiIfIndex interface,
516 AvahiProtocol protocol,
517 const gchar *service_type /** DNS-SD service type, e.g. "_http._tcp" */,
519 AvahiServiceBrowserCallback callback,
522 /** Free an AvahiServiceBrowser object */
523 void avahi_service_browser_free(AvahiServiceBrowser *b);
525 /** A DNS-SD service resolver. Use this to retrieve addres, port and TXT data for a DNS-SD service */
526 typedef struct AvahiServiceResolver AvahiServiceResolver;
528 /** Callback prototype for AvahiServiceResolver events */
529 typedef void (*AvahiServiceResolverCallback)(
530 AvahiServiceResolver *r,
531 AvahiIfIndex interface,
532 AvahiProtocol protocol,
533 AvahiResolverEvent event,
534 const gchar *name, /**< Service name */
535 const gchar *type, /**< Service Type */
537 const gchar *host_name, /**< Host name of the service */
538 const AvahiAddress *a, /**< The resolved host name */
539 guint16 port, /**< Service name */
540 AvahiStringList *txt, /**< TXT record data */
543 /** Create a new AvahiServiceResolver object */
544 AvahiServiceResolver *avahi_service_resolver_new(
546 AvahiIfIndex interface,
547 AvahiProtocol protocol,
551 AvahiProtocol aprotocol, /**< Address family of the desired service address. Use AVAHI_PROTO_UNSPEC if you don't care */
552 AvahiServiceResolverCallback calback,
555 /** Free an AvahiServiceResolver object */
556 void avahi_service_resolver_free(AvahiServiceResolver *r);
558 /** A domain service browser object. Use this to browse for
559 * conventional unicast DNS servers which may be used to resolve
560 * conventional domain names */
561 typedef struct AvahiDNSServerBrowser AvahiDNSServerBrowser;
563 /** Callback prototype for AvahiDNSServerBrowser events */
564 typedef void (*AvahiDNSServerBrowserCallback)(
565 AvahiDNSServerBrowser *b,
566 AvahiIfIndex interface,
567 AvahiProtocol protocol,
568 AvahiBrowserEvent event,
569 const gchar *host_name, /**< Host name of the DNS server, probably useless */
570 const AvahiAddress *a, /**< Address of the DNS server */
571 guint16 port, /**< Port number of the DNS servers, probably 53 */
574 /** Create a new AvahiDNSServerBrowser object */
575 AvahiDNSServerBrowser *avahi_dns_server_browser_new(
577 AvahiIfIndex interface,
578 AvahiProtocol protocol,
580 AvahiDNSServerType type,
581 AvahiProtocol aprotocol, /**< Address protocol for the DNS server */
582 AvahiDNSServerBrowserCallback callback,
585 /** Free an AvahiDNSServerBrowser object */
586 void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b);