1 /* SPDX-License-Identifier: LGPL-2.1+ */
3 #include "conf-files.h"
4 #include "conf-parser.h"
6 #include "resolved-dnssd.h"
7 #include "resolved-dns-rr.h"
8 #include "resolved-manager.h"
12 #define DNSSD_SERVICE_DIRS ((const char* const*) CONF_PATHS_STRV("systemd/dnssd"))
14 DnssdTxtData
*dnssd_txtdata_free(DnssdTxtData
*txt_data
) {
18 dns_resource_record_unref(txt_data
->rr
);
19 dns_txt_item_free_all(txt_data
->txt
);
21 return mfree(txt_data
);
24 DnssdTxtData
*dnssd_txtdata_free_all(DnssdTxtData
*txt_data
) {
30 next
= txt_data
->items_next
;
32 dnssd_txtdata_free(txt_data
);
34 return dnssd_txtdata_free_all(next
);
37 DnssdService
*dnssd_service_free(DnssdService
*service
) {
42 hashmap_remove(service
->manager
->dnssd_services
, service
->name
);
44 dns_resource_record_unref(service
->ptr_rr
);
45 dns_resource_record_unref(service
->srv_rr
);
47 dnssd_txtdata_free_all(service
->txt_data_items
);
49 free(service
->filename
);
52 free(service
->name_template
);
54 return mfree(service
);
57 static int dnssd_service_load(Manager
*manager
, const char *filename
) {
58 _cleanup_(dnssd_service_freep
) DnssdService
*service
= NULL
;
59 _cleanup_(dnssd_txtdata_freep
) DnssdTxtData
*txt_data
= NULL
;
61 const char *dropin_dirname
;
67 service
= new0(DnssdService
, 1);
71 service
->filename
= strdup(filename
);
72 if (!service
->filename
)
75 service
->name
= strdup(basename(filename
));
79 d
= endswith(service
->name
, ".dnssd");
83 assert(streq(d
, ".dnssd"));
87 dropin_dirname
= strjoina(service
->name
, ".dnssd.d");
89 r
= config_parse_many(
90 filename
, DNSSD_SERVICE_DIRS
, dropin_dirname
,
92 config_item_perf_lookup
, resolved_dnssd_gperf_lookup
,
99 if (!service
->name_template
) {
100 log_error("%s doesn't define service instance name", service
->name
);
104 if (!service
->type
) {
105 log_error("%s doesn't define service type", service
->name
);
109 if (LIST_IS_EMPTY(service
->txt_data_items
)) {
110 txt_data
= new0(DnssdTxtData
, 1);
114 r
= dns_txt_item_new_empty(&txt_data
->txt
);
118 LIST_PREPEND(items
, service
->txt_data_items
, txt_data
);
122 r
= hashmap_ensure_allocated(&manager
->dnssd_services
, &string_hash_ops
);
126 r
= hashmap_put(manager
->dnssd_services
, service
->name
, service
);
130 service
->manager
= manager
;
132 r
= dnssd_update_rrs(service
);
141 static int specifier_dnssd_host_name(char specifier
, const void *data
, const void *userdata
, char **ret
) {
142 DnssdService
*s
= (DnssdService
*) userdata
;
147 assert(s
->manager
->llmnr_hostname
);
149 n
= strdup(s
->manager
->llmnr_hostname
);
157 int dnssd_render_instance_name(DnssdService
*s
, char **ret_name
) {
158 static const Specifier specifier_table
[] = {
159 { 'm', specifier_machine_id
, NULL
},
160 { 'b', specifier_boot_id
, NULL
},
161 { 'H', specifier_dnssd_host_name
, NULL
},
162 { 'v', specifier_kernel_release
, NULL
},
163 { 'a', specifier_architecture
, NULL
},
164 { 'o', specifier_os_id
, NULL
},
165 { 'w', specifier_os_version_id
, NULL
},
166 { 'B', specifier_os_build_id
, NULL
},
167 { 'W', specifier_os_variant_id
, NULL
},
170 _cleanup_free_
char *name
= NULL
;
174 assert(s
->name_template
);
176 r
= specifier_printf(s
->name_template
, specifier_table
, s
, &name
);
178 return log_debug_errno(r
, "Failed to replace specifiers: %m");
180 if (!dns_service_name_is_valid(name
))
181 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL
),
182 "Service instance name '%s' is invalid.",
185 *ret_name
= TAKE_PTR(name
);
190 int dnssd_load(Manager
*manager
) {
191 _cleanup_strv_free_
char **files
= NULL
;
197 if (manager
->mdns_support
!= RESOLVE_SUPPORT_YES
)
200 r
= conf_files_list_strv(&files
, ".dnssd", NULL
, 0, DNSSD_SERVICE_DIRS
);
202 return log_error_errno(r
, "Failed to enumerate .dnssd files: %m");
204 STRV_FOREACH_BACKWARDS(f
, files
) {
205 r
= dnssd_service_load(manager
, *f
);
207 log_warning_errno(r
, "Failed to load '%s': %m", *f
);;
213 int dnssd_update_rrs(DnssdService
*s
) {
214 _cleanup_free_
char *n
= NULL
;
215 _cleanup_free_
char *service_name
= NULL
;
216 _cleanup_free_
char *full_name
= NULL
;
217 DnssdTxtData
*txt_data
;
221 assert(s
->txt_data_items
);
224 s
->ptr_rr
= dns_resource_record_unref(s
->ptr_rr
);
225 s
->srv_rr
= dns_resource_record_unref(s
->srv_rr
);
226 LIST_FOREACH(items
, txt_data
, s
->txt_data_items
)
227 txt_data
->rr
= dns_resource_record_unref(txt_data
->rr
);
229 r
= dnssd_render_instance_name(s
, &n
);
233 r
= dns_name_concat(s
->type
, "local", 0, &service_name
);
236 r
= dns_name_concat(n
, service_name
, 0, &full_name
);
240 LIST_FOREACH(items
, txt_data
, s
->txt_data_items
) {
241 txt_data
->rr
= dns_resource_record_new_full(DNS_CLASS_IN
, DNS_TYPE_TXT
,
246 txt_data
->rr
->ttl
= MDNS_DEFAULT_TTL
;
247 txt_data
->rr
->txt
.items
= dns_txt_item_copy(txt_data
->txt
);
248 if (!txt_data
->rr
->txt
.items
)
252 s
->ptr_rr
= dns_resource_record_new_full(DNS_CLASS_IN
, DNS_TYPE_PTR
,
257 s
->ptr_rr
->ttl
= MDNS_DEFAULT_TTL
;
258 s
->ptr_rr
->ptr
.name
= strdup(full_name
);
259 if (!s
->ptr_rr
->ptr
.name
)
262 s
->srv_rr
= dns_resource_record_new_full(DNS_CLASS_IN
, DNS_TYPE_SRV
,
267 s
->srv_rr
->ttl
= MDNS_DEFAULT_TTL
;
268 s
->srv_rr
->srv
.priority
= s
->priority
;
269 s
->srv_rr
->srv
.weight
= s
->weight
;
270 s
->srv_rr
->srv
.port
= s
->port
;
271 s
->srv_rr
->srv
.name
= strdup(s
->manager
->mdns_hostname
);
272 if (!s
->srv_rr
->srv
.name
)
278 LIST_FOREACH(items
, txt_data
, s
->txt_data_items
)
279 txt_data
->rr
= dns_resource_record_unref(txt_data
->rr
);
280 s
->ptr_rr
= dns_resource_record_unref(s
->ptr_rr
);
281 s
->srv_rr
= dns_resource_record_unref(s
->srv_rr
);
285 int dnssd_txt_item_new_from_string(const char *key
, const char *value
, DnsTxtItem
**ret_item
) {
289 length
= strlen(key
);
292 length
+= strlen(value
) + 1; /* length of value plus '=' */
294 i
= malloc0(offsetof(DnsTxtItem
, data
) + length
+ 1); /* for safety reasons we add an extra NUL byte */
298 memcpy(i
->data
, key
, strlen(key
));
299 if (!isempty(value
)) {
300 memcpy(i
->data
+ strlen(key
), "=", 1);
301 memcpy(i
->data
+ strlen(key
) + 1, value
, strlen(value
));
305 *ret_item
= TAKE_PTR(i
);
310 int dnssd_txt_item_new_from_data(const char *key
, const void *data
, const size_t size
, DnsTxtItem
**ret_item
) {
314 length
= strlen(key
);
317 length
+= size
+ 1; /* size of date plus '=' */
319 i
= malloc0(offsetof(DnsTxtItem
, data
) + length
+ 1); /* for safety reasons we add an extra NUL byte */
323 memcpy(i
->data
, key
, strlen(key
));
325 memcpy(i
->data
+ strlen(key
), "=", 1);
326 memcpy(i
->data
+ strlen(key
) + 1, data
, size
);
330 *ret_item
= TAKE_PTR(i
);
335 void dnssd_signal_conflict(Manager
*manager
, const char *name
) {
340 HASHMAP_FOREACH(s
, manager
->dnssd_services
, i
) {
344 if (dns_name_equal(dns_resource_key_name(s
->srv_rr
->key
), name
)) {
345 _cleanup_free_
char *path
= NULL
;
349 r
= sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s
->name
, &path
);
351 log_error_errno(r
, "Can't get D-BUS object path: %m");
355 r
= sd_bus_emit_signal(manager
->bus
,
357 "org.freedesktop.resolve1.DnssdService",
361 log_error_errno(r
, "Cannot emit signal: %m");