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>
37 #include <avahi-common/defs.h>
39 #ifndef DOXYGEN_SHOULD_SKIP_THIS
43 /** An mDNS responder object */
44 typedef struct AvahiServer AvahiServer;
46 /** A locally registered DNS resource record */
47 typedef struct AvahiEntry AvahiEntry;
49 /** A group of locally registered DNS RRs */
50 typedef struct AvahiEntryGroup AvahiEntryGroup;
52 #ifndef DOXYGEN_SHOULD_SKIP_THIS
56 #include <avahi-common/address.h>
57 #include <avahi-common/rr.h>
58 #include <avahi-common/alternative.h>
60 #ifndef DOXYGEN_SHOULD_SKIP_THIS
64 /** Error codes used by avahi */
66 AVAHI_OK = 0, /**< OK */
67 AVAHI_ERR_FAILURE = -1, /**< Generic error code */
68 AVAHI_ERR_BAD_STATE = -2, /**< Object was in a bad state */
69 AVAHI_ERR_INVALID_HOST_NAME = -3, /**< Invalid host name */
70 AVAHI_ERR_INVALID_DOMAIN_NAME = -4, /**< Invalid domain name */
71 AVAHI_ERR_NO_NETWORK = -5, /**< No suitable network protocol available */
72 AVAHI_ERR_INVALID_TTL = -6, /**< Invalid DNS TTL */
73 AVAHI_ERR_IS_PATTERN = -7, /**< RR key is pattern */
74 AVAHI_ERR_LOCAL_COLLISION = -8, /**< Local name collision */
75 AVAHI_ERR_INVALID_RECORD = -9, /**< Invalid RR */
76 AVAHI_ERR_INVALID_SERVICE_NAME = -10, /**< Invalid service name */
77 AVAHI_ERR_INVALID_SERVICE_TYPE = -11, /**< Invalid service type */
78 AVAHI_ERR_INVALID_PORT = -12, /**< Invalid port number */
79 AVAHI_ERR_INVALID_KEY = -13, /**< Invalid key */
80 AVAHI_ERR_INVALID_ADDRESS = -14, /**< Invalid address */
81 AVAHI_ERR_TIMEOUT = -15, /**< Timeout reached */
82 AVAHI_ERR_TOO_MANY_CLIENTS = -16, /**< Too many clients */
83 AVAHI_ERR_TOO_MANY_OBJECTS = -17, /**< Too many objects */
84 AVAHI_ERR_TOO_MANY_ENTRIES = -18, /**< Too many entries */
85 AVAHI_ERR_OS = -19, /**< OS error */
86 AVAHI_ERR_ACCESS_DENIED = -20, /**< Access denied */
87 AVAHI_ERR_INVALID_OPERATION = -21, /**< Invalid operation */
91 /** Flags for server entries */
93 AVAHI_ENTRY_NULL = 0, /**< No special flags */
94 AVAHI_ENTRY_UNIQUE = 1, /**< The RRset is intended to be unique */
95 AVAHI_ENTRY_NOPROBE = 2, /**< Though the RRset is intended to be unique no probes shall be sent */
96 AVAHI_ENTRY_NOANNOUNCE = 4, /**< Do not announce this RR to other hosts */
97 AVAHI_ENTRY_ALLOWMUTIPLE = 8 /**< Allow multiple local records of this type, even if they are intended to be unique */
100 /** Prototype for callback functions which are called whenever the state of an AvahiServer object changes */
101 typedef void (*AvahiServerCallback) (AvahiServer *s, AvahiServerState state, gpointer userdata);
103 /** Prototype for callback functions which are called whenever the state of an AvahiEntryGroup object changes */
104 typedef void (*AvahiEntryGroupCallback) (AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, gpointer userdata);
106 /** Stores configuration options for a server instance */
107 typedef struct AvahiServerConfig {
108 gchar *host_name; /**< Default host name. If left empty defaults to the result of gethostname(2) of the libc */
109 gchar *domain_name; /**< Default domain name. If left empty defaults to .local */
110 gboolean use_ipv4; /**< Enable IPv4 support */
111 gboolean use_ipv6; /**< Enable IPv6 support */
112 gboolean publish_hinfo; /**< Register a HINFO record for the host containing the local OS and CPU type */
113 gboolean publish_addresses; /**< Register A, AAAA and PTR records for all local IP addresses */
114 gboolean publish_workstation; /**< Register a _workstation._tcp service */
115 gboolean publish_domain; /**< Announce the local domain for browsing */
116 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. */
117 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. */
118 gboolean enable_reflector; /**< Reflect incoming mDNS traffic to all local networks. This allows mDNS based network browsing beyond ethernet borders */
119 gboolean reflect_ipv; /**< if enable_reflector is TRUE, enable/disable reflecting between IPv4 and IPv6 */
122 /** Allocate a new mDNS responder object. */
123 AvahiServer *avahi_server_new(
124 GMainContext *c, /**< The GLIB main loop context to attach to */
125 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. */
126 AvahiServerCallback callback, /**< A callback which is called whenever the state of the server changes */
127 gpointer userdata, /**< An opaque pointer which is passed to the callback function */
130 /** Free an mDNS responder object */
131 void avahi_server_free(AvahiServer* s);
133 /** Fill in default values for a server configuration structure. If you
134 * make use of an AvahiServerConfig structure be sure to initialize
135 * it with this function for the sake of upwards library
136 * compatibility. This call may allocate strings on the heap. To
137 * release this memory make sure to call
138 * avahi_server_config_done(). If you want to replace any strings in
139 * the structure be sure to free the strings filled in by this
140 * function with g_free() first and allocate the replacements with
141 * g_malloc() (or g_strdup()).*/
142 AvahiServerConfig* avahi_server_config_init(
143 AvahiServerConfig *c /**< A structure which shall be filled in */ );
145 /** Make a deep copy of the configuration structure *c to *ret. */
146 AvahiServerConfig* avahi_server_config_copy(
147 AvahiServerConfig *ret /**< destination */,
148 const AvahiServerConfig *c /**< source */);
150 /** Free the data in a server configuration structure. */
151 void avahi_server_config_free(AvahiServerConfig *c);
153 /** Return the currently chosen domain name of the server object. The
154 * return value points to an internally allocated string. Be sure to
155 * make a copy of the string before calling any other library
157 const gchar* avahi_server_get_domain_name(AvahiServer *s);
159 /** Return the currently chosen host name. The return value points to a internally allocated string. */
160 const gchar* avahi_server_get_host_name(AvahiServer *s);
162 /** Return the currently chosen host name as a FQDN ("fully qualified
163 * domain name", i.e. the concatenation of the host and domain
164 * name). The return value points to a internally allocated string. */
165 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s);
167 /** Change the host name of a running mDNS responder. This will drop
168 all automicatilly generated RRs and readd them with the new
169 name. Since the responder has to probe for the new RRs this function
170 takes some time to take effect altough it returns immediately. This
171 function is intended to be called when a host name conflict is
172 reported using AvahiServerCallback. The caller should readd all user
173 defined RRs too since they otherwise continue to point to the outdated
175 gint avahi_server_set_host_name(AvahiServer *s, const gchar *host_name);
177 /** Change the domain name of a running mDNS responder. The same rules
178 * as with avahi_server_set_host_name() apply. */
179 gint avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name);
181 /** Return the opaque user data pointer attached to a server object */
182 gpointer avahi_server_get_data(AvahiServer *s);
184 /** Change the opaque user data pointer attached to a server object */
185 void avahi_server_set_data(AvahiServer *s, gpointer userdata);
187 /** Return the current state of the server object */
188 AvahiServerState avahi_server_get_state(AvahiServer *s);
190 /** Iterate through all local entries of the server. (when g is NULL)
191 * or of a specified entry group. At the first call state should point
192 * to a NULL initialized void pointer, That pointer is used to track
193 * the current iteration. It is not safe to call any other
194 * avahi_server_xxx() function during the iteration. If the last entry
195 * has been read, NULL is returned. */
196 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state);
198 /** Callback prototype for avahi_server_dump() */
199 typedef void (*AvahiDumpCallback)(const gchar *text, gpointer userdata);
201 /** Dump the current server status by calling "callback" for each line. */
202 void avahi_server_dump(AvahiServer *s, AvahiDumpCallback callback, gpointer userdata);
204 /** Create a new entry group. The specified callback function is
205 * called whenever the state of the group changes. Use entry group
206 * objects to keep track of you RRs. Add new RRs to a group using
207 * avahi_server_add_xxx(). Make sure to call avahi_entry_group_commit()
208 * to start the registration process for your RRs */
209 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata);
211 /** Free an entry group. All RRs assigned to the group are removed from the server */
212 void avahi_entry_group_free(AvahiEntryGroup *g);
214 /** Commit an entry group. This starts the probing and registration process for all RRs in the group */
215 gint avahi_entry_group_commit(AvahiEntryGroup *g);
217 /** Remove all entries from the entry group and reset the state to AVAHI_ENTRY_GROUP_UNCOMMITED. */
218 void avahi_entry_group_reset(AvahiEntryGroup *g);
220 /** Return TRUE if the entry group is empty, i.e. has no records attached. */
221 gboolean avahi_entry_group_is_empty(AvahiEntryGroup *g);
223 /** Return the current state of the specified entry group */
224 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g);
226 /** Change the opaque user data pointer attached to an entry group object */
227 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata);
229 /** Return the opaque user data pointer currently set for the entry group object */
230 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g);
232 /** Add a new resource record to the server. Returns 0 on success, negative otherwise. */
233 gint avahi_server_add(
234 AvahiServer *s, /**< The server object to add this record to */
235 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. */
236 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 */
237 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). */
238 AvahiEntryFlags flags, /**< Special flags for this record */
239 AvahiRecord *r /**< The record to add. This function increases the reference counter of this object. */ );
241 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
242 gint avahi_server_add_ptr(
245 AvahiIfIndex interface,
246 AvahiProtocol protocol,
247 AvahiEntryFlags flags,
248 guint32 ttl, /**< DNS TTL for this record */
249 const gchar *name, /**< PTR record name */
250 const gchar *dest /**< pointer destination */ );
252 /** Add a PTR RR to the server. See avahi_server_add() for more information. */
253 gint avahi_server_add_txt(
256 AvahiIfIndex interface,
257 AvahiProtocol protocol,
258 AvahiEntryFlags flags,
259 guint32 ttl, /**< DNS TTL for this record */
260 const gchar *name, /**< TXT record name */
261 ... /**< Text record data, terminated by NULL */);
263 /** Add a PTR RR to the server. Mostly identical to
264 * avahi_server_add_text but takes a va_list instead of a variable
265 * number of arguments */
266 gint avahi_server_add_txt_va(
269 AvahiIfIndex interface,
270 AvahiProtocol protocol,
271 AvahiEntryFlags flags,
276 /** Add a PTR RR to the server. Mostly identical to
277 * avahi_server_add_text but takes an AvahiStringList record instead of a variable
278 * number of arguments. */
279 gint avahi_server_add_txt_strlst(
282 AvahiIfIndex interface,
283 AvahiProtocol protocol,
284 AvahiEntryFlags flags,
287 AvahiStringList *strlst /**< TXT decord data as a AvahiString. This routine makes a deep copy of this object. */ );
289 /** Add an IP address mapping to the server. This will add both the
290 * host-name-to-address and the reverse mapping to the server. See
291 * avahi_server_add() for more information. If adding one of the RRs
292 * fails, the function returns with an error, but it is not defined if
293 * the other RR is deleted from the server or not. Therefore, you have
294 * to free the AvahiEntryGroup and create a new one before
296 gint avahi_server_add_address(
299 AvahiIfIndex interface,
300 AvahiProtocol protocol,
301 AvahiEntryFlags flags,
305 /** Add an DNS-SD service to the Server. This will add all required
306 * RRs to the server. See avahi_server_add() for more information. If
307 * adding one of the RRs fails, the function returns with an error,
308 * but it is not defined if the other RR is deleted from the server or
309 * not. Therefore, you have to free the AvahiEntryGroup and create a
310 * new one before proceeding. */
311 gint avahi_server_add_service(
314 AvahiIfIndex interface,
315 AvahiProtocol protocol,
316 const gchar *name, /**< Service name, e.g. "Lennart's Files" */
317 const gchar *type, /**< DNS-SD type, e.g. "_http._tcp" */
319 const gchar *host, /**< Host name where this servcie resides, or NULL if on the local host */
320 guint16 port, /**< Port number of the service */
321 ... /**< Text records, terminated by NULL */);
323 /** Mostly identical to avahi_server_add_service(), but takes an va_list for the TXT records. */
324 gint avahi_server_add_service_va(
327 AvahiIfIndex interface,
328 AvahiProtocol protocol,
336 /** Mostly identical to avahi_server_add_service(), but takes an AvahiStringList object for the TXT records. The AvahiStringList object is copied. */
337 gint avahi_server_add_service_strlst(
340 AvahiIfIndex interface,
341 AvahiProtocol protocol,
347 AvahiStringList *strlst);
349 /** The type of DNS server */
351 AVAHI_DNS_SERVER_RESOLVE, /**< Unicast DNS servers for normal resolves (_domain._udp)*/
352 AVAHI_DNS_SERVER_UPDATE /**< Unicast DNS servers for updates (_dns-update._udp)*/
353 } AvahiDNSServerType;
355 /** Publish the specified unicast DNS server address via mDNS. You may
356 * browse for records create this way wit
357 * avahi_dns_server_browser_new(). */
358 gint avahi_server_add_dns_server_address(
361 AvahiIfIndex interface,
362 AvahiProtocol protocol,
364 AvahiDNSServerType type,
365 const AvahiAddress *address,
366 guint16 port /** should be 53 */);
368 /** Similar to avahi_server_add_dns_server_address(), but specify a
369 host name instead of an address. The specified host name should be
370 resolvable via mDNS */
371 gint avahi_server_add_dns_server_name(
374 AvahiIfIndex interface,
375 AvahiProtocol protocol,
377 AvahiDNSServerType type,
379 guint16 port /** should be 53 */);
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 /** A local domain browsing object. May be used to enumerate domains used on the local LAN */
457 typedef struct AvahiDomainBrowser AvahiDomainBrowser;
459 /** Callback prototype for AvahiDomainBrowser events */
460 typedef void (*AvahiDomainBrowserCallback)(
461 AvahiDomainBrowser *b,
462 AvahiIfIndex interface,
463 AvahiProtocol protocol,
464 AvahiBrowserEvent event,
468 /** Create a new AvahiDomainBrowser object */
469 AvahiDomainBrowser *avahi_domain_browser_new(
471 AvahiIfIndex interface,
472 AvahiProtocol protocol,
474 AvahiDomainBrowserType type,
475 AvahiDomainBrowserCallback callback,
478 /** Free an AvahiDomainBrowser object */
479 void avahi_domain_browser_free(AvahiDomainBrowser *b);
481 /** A DNS-SD service type browsing object. May be used to enumerate the service types of all available services on the local LAN */
482 typedef struct AvahiServiceTypeBrowser AvahiServiceTypeBrowser;
484 /** Callback prototype for AvahiServiceTypeBrowser events */
485 typedef void (*AvahiServiceTypeBrowserCallback)(
486 AvahiServiceTypeBrowser *b,
487 AvahiIfIndex interface,
488 AvahiProtocol protocol,
489 AvahiBrowserEvent event,
494 /** Create a new AvahiServiceTypeBrowser object. */
495 AvahiServiceTypeBrowser *avahi_service_type_browser_new(
497 AvahiIfIndex interface,
498 AvahiProtocol protocol,
500 AvahiServiceTypeBrowserCallback callback,
503 /** Free an AvahiServiceTypeBrowser object */
504 void avahi_service_type_browser_free(AvahiServiceTypeBrowser *b);
506 /** 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. */
507 typedef struct AvahiServiceBrowser AvahiServiceBrowser;
509 /** Callback prototype for AvahiServiceBrowser events */
510 typedef void (*AvahiServiceBrowserCallback)(
511 AvahiServiceBrowser *b,
512 AvahiIfIndex interface,
513 AvahiProtocol protocol,
514 AvahiBrowserEvent event,
515 const gchar *name /**< Service name, e.g. "Lennart's Files" */,
516 const gchar *type /**< DNS-SD type, e.g. "_http._tcp" */,
517 const gchar *domain /**< Domain of this service, e.g. "local" */,
520 /** Create a new AvahiServiceBrowser object. */
521 AvahiServiceBrowser *avahi_service_browser_new(
523 AvahiIfIndex interface,
524 AvahiProtocol protocol,
525 const gchar *service_type /** DNS-SD service type, e.g. "_http._tcp" */,
527 AvahiServiceBrowserCallback callback,
530 /** Free an AvahiServiceBrowser object */
531 void avahi_service_browser_free(AvahiServiceBrowser *b);
533 /** A DNS-SD service resolver. Use this to retrieve addres, port and TXT data for a DNS-SD service */
534 typedef struct AvahiServiceResolver AvahiServiceResolver;
536 /** Callback prototype for AvahiServiceResolver events */
537 typedef void (*AvahiServiceResolverCallback)(
538 AvahiServiceResolver *r,
539 AvahiIfIndex interface,
540 AvahiProtocol protocol,
541 AvahiResolverEvent event,
542 const gchar *name, /**< Service name */
543 const gchar *type, /**< Service Type */
545 const gchar *host_name, /**< Host name of the service */
546 const AvahiAddress *a, /**< The resolved host name */
547 guint16 port, /**< Service name */
548 AvahiStringList *txt, /**< TXT record data */
551 /** Create a new AvahiServiceResolver object */
552 AvahiServiceResolver *avahi_service_resolver_new(
554 AvahiIfIndex interface,
555 AvahiProtocol protocol,
559 AvahiProtocol aprotocol, /**< Address family of the desired service address. Use AVAHI_PROTO_UNSPEC if you don't care */
560 AvahiServiceResolverCallback calback,
563 /** Free an AvahiServiceResolver object */
564 void avahi_service_resolver_free(AvahiServiceResolver *r);
566 /** A domain service browser object. Use this to browse for
567 * conventional unicast DNS servers which may be used to resolve
568 * conventional domain names */
569 typedef struct AvahiDNSServerBrowser AvahiDNSServerBrowser;
571 /** Callback prototype for AvahiDNSServerBrowser events */
572 typedef void (*AvahiDNSServerBrowserCallback)(
573 AvahiDNSServerBrowser *b,
574 AvahiIfIndex interface,
575 AvahiProtocol protocol,
576 AvahiBrowserEvent event,
577 const gchar *host_name, /**< Host name of the DNS server, probably useless */
578 const AvahiAddress *a, /**< Address of the DNS server */
579 guint16 port, /**< Port number of the DNS servers, probably 53 */
582 /** Create a new AvahiDNSServerBrowser object */
583 AvahiDNSServerBrowser *avahi_dns_server_browser_new(
585 AvahiIfIndex interface,
586 AvahiProtocol protocol,
588 AvahiDNSServerType type,
589 AvahiProtocol aprotocol, /**< Address protocol for the DNS server */
590 AvahiDNSServerBrowserCallback callback,
593 /** Free an AvahiDNSServerBrowser object */
594 void avahi_dns_server_browser_free(AvahiDNSServerBrowser *b);
596 /** Return a human readable error string for the specified error code */
597 const gchar *avahi_strerror(gint error);
599 /** Return the last error code */
600 gint avahi_server_errno(AvahiServer *s);
602 #ifndef DOXYGEN_SHOULD_SKIP_THIS