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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
6501dd31 DR |
2 | |
3 | #include "conf-files.h" | |
4 | #include "conf-parser.h" | |
28db6fbf | 5 | #include "constants.h" |
0ef0e269 LP |
6 | #include "path-util.h" |
7 | #include "resolved-conf.h" | |
6501dd31 | 8 | #include "resolved-dns-rr.h" |
0ef0e269 | 9 | #include "resolved-dnssd.h" |
6501dd31 DR |
10 | #include "resolved-manager.h" |
11 | #include "specifier.h" | |
12 | #include "strv.h" | |
13 | ||
eb5f4dde | 14 | #define DNSSD_SERVICE_DIRS ((const char* const*) CONF_PATHS_STRV("systemd/dnssd")) |
6501dd31 | 15 | |
400f54fb DR |
16 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
17 | if (!txt_data) | |
18 | return NULL; | |
19 | ||
20 | dns_resource_record_unref(txt_data->rr); | |
d70f15f5 | 21 | dns_txt_item_free_all(txt_data->txts); |
400f54fb DR |
22 | |
23 | return mfree(txt_data); | |
24 | } | |
25 | ||
26 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
27 | DnssdTxtData *next; | |
28 | ||
29 | if (!txt_data) | |
30 | return NULL; | |
31 | ||
32 | next = txt_data->items_next; | |
33 | ||
34 | dnssd_txtdata_free(txt_data); | |
35 | ||
36 | return dnssd_txtdata_free_all(next); | |
37 | } | |
38 | ||
6501dd31 DR |
39 | DnssdService *dnssd_service_free(DnssdService *service) { |
40 | if (!service) | |
41 | return NULL; | |
42 | ||
43 | if (service->manager) | |
0ef0e269 | 44 | hashmap_remove(service->manager->dnssd_services, service->id); |
6501dd31 DR |
45 | |
46 | dns_resource_record_unref(service->ptr_rr); | |
88123aa2 | 47 | dns_resource_record_unref(service->sub_ptr_rr); |
6501dd31 | 48 | dns_resource_record_unref(service->srv_rr); |
400f54fb DR |
49 | |
50 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 | 51 | |
40763016 | 52 | free(service->path); |
0ef0e269 | 53 | free(service->id); |
6501dd31 | 54 | free(service->type); |
88123aa2 | 55 | free(service->subtype); |
6501dd31 | 56 | free(service->name_template); |
6501dd31 DR |
57 | |
58 | return mfree(service); | |
59 | } | |
60 | ||
14a52176 LB |
61 | void dnssd_service_clear_on_reload(Hashmap *services) { |
62 | DnssdService *service; | |
63 | ||
64 | HASHMAP_FOREACH(service, services) | |
65 | if (service->config_source == RESOLVE_CONFIG_SOURCE_FILE) { | |
0ef0e269 | 66 | hashmap_remove(services, service->id); |
14a52176 LB |
67 | dnssd_service_free(service); |
68 | } | |
69 | } | |
70 | ||
0ef0e269 LP |
71 | static int dnssd_id_from_path(const char *path, char **ret_id) { |
72 | int r; | |
73 | ||
74 | assert(path); | |
75 | assert(ret_id); | |
76 | ||
77 | _cleanup_free_ char *fn = NULL; | |
78 | r = path_extract_filename(path, &fn); | |
79 | if (r < 0) | |
80 | return r; | |
81 | ||
82 | char *d = endswith(fn, ".dnssd"); | |
83 | if (!d) | |
84 | return -EINVAL; | |
85 | ||
86 | *d = '\0'; | |
87 | ||
88 | *ret_id = TAKE_PTR(fn); | |
89 | return 0; | |
90 | } | |
91 | ||
40763016 | 92 | static int dnssd_service_load(Manager *manager, const char *path) { |
6501dd31 | 93 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; |
400f54fb | 94 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
0ef0e269 | 95 | _cleanup_free_ char *dropin_dirname = NULL; |
6501dd31 DR |
96 | int r; |
97 | ||
98 | assert(manager); | |
40763016 | 99 | assert(path); |
6501dd31 DR |
100 | |
101 | service = new0(DnssdService, 1); | |
102 | if (!service) | |
103 | return log_oom(); | |
104 | ||
40763016 LP |
105 | service->path = strdup(path); |
106 | if (!service->path) | |
6501dd31 DR |
107 | return log_oom(); |
108 | ||
0ef0e269 LP |
109 | r = dnssd_id_from_path(path, &service->id); |
110 | if (r < 0) | |
111 | return log_error_errno(r, "Failed to extract DNS-SD service id from filename: %m"); | |
6501dd31 | 112 | |
0ef0e269 LP |
113 | dropin_dirname = strjoin(service->id, ".dnssd.d"); |
114 | if (!dropin_dirname) | |
115 | return log_oom(); | |
6501dd31 | 116 | |
4f9ff96a | 117 | r = config_parse_many( |
40763016 | 118 | STRV_MAKE_CONST(path), DNSSD_SERVICE_DIRS, dropin_dirname, /* root = */ NULL, |
4f9ff96a LP |
119 | "Service\0", |
120 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
121 | CONFIG_PARSE_WARN, | |
122 | service, | |
ead3a3fc | 123 | NULL, |
4f9ff96a | 124 | NULL); |
6501dd31 DR |
125 | if (r < 0) |
126 | return r; | |
127 | ||
d7a0f1f4 FS |
128 | if (!service->name_template) |
129 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
130 | "%s doesn't define service instance name", | |
0ef0e269 | 131 | service->id); |
d7a0f1f4 FS |
132 | |
133 | if (!service->type) | |
134 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
135 | "%s doesn't define service type", | |
0ef0e269 | 136 | service->id); |
6501dd31 | 137 | |
64903d18 | 138 | if (!service->txt_data_items) { |
400f54fb DR |
139 | txt_data = new0(DnssdTxtData, 1); |
140 | if (!txt_data) | |
141 | return log_oom(); | |
142 | ||
d70f15f5 | 143 | r = dns_txt_item_new_empty(&txt_data->txts); |
6501dd31 DR |
144 | if (r < 0) |
145 | return r; | |
400f54fb DR |
146 | |
147 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
15c69d07 | 148 | TAKE_PTR(txt_data); |
6501dd31 DR |
149 | } |
150 | ||
0ef0e269 | 151 | r = hashmap_ensure_put(&manager->dnssd_services, &string_hash_ops, service->id, service); |
6501dd31 DR |
152 | if (r < 0) |
153 | return r; | |
154 | ||
155 | service->manager = manager; | |
156 | ||
6db6a464 DR |
157 | r = dnssd_update_rrs(service); |
158 | if (r < 0) | |
159 | return r; | |
160 | ||
15c69d07 | 161 | TAKE_PTR(service); |
6501dd31 DR |
162 | |
163 | return 0; | |
164 | } | |
165 | ||
9a5893e9 | 166 | static int specifier_dnssd_hostname(char specifier, const void *data, const char *root, const void *userdata, char **ret) { |
a3f87e32 | 167 | const Manager *m = ASSERT_PTR(userdata); |
6501dd31 | 168 | |
a3f87e32 | 169 | assert(m->llmnr_hostname); |
6501dd31 | 170 | |
454318d3 | 171 | return strdup_to(ret, m->llmnr_hostname); |
6501dd31 DR |
172 | } |
173 | ||
a3f87e32 | 174 | int dnssd_render_instance_name(Manager *m, DnssdService *s, char **ret) { |
6501dd31 | 175 | static const Specifier specifier_table[] = { |
9a5893e9 ZJS |
176 | { 'a', specifier_architecture, NULL }, |
177 | { 'b', specifier_boot_id, NULL }, | |
178 | { 'B', specifier_os_build_id, NULL }, | |
179 | { 'H', specifier_dnssd_hostname, NULL }, | |
180 | { 'm', specifier_machine_id, NULL }, | |
181 | { 'o', specifier_os_id, NULL }, | |
182 | { 'v', specifier_kernel_release, NULL }, | |
183 | { 'w', specifier_os_version_id, NULL }, | |
184 | { 'W', specifier_os_variant_id, NULL }, | |
6501dd31 DR |
185 | {} |
186 | }; | |
187 | _cleanup_free_ char *name = NULL; | |
188 | int r; | |
189 | ||
a3f87e32 | 190 | assert(m); |
07e4a8dc RB |
191 | assert(s); |
192 | assert(s->name_template); | |
6501dd31 | 193 | |
a3f87e32 | 194 | r = specifier_printf(s->name_template, DNS_LABEL_MAX, specifier_table, NULL, m, &name); |
6501dd31 | 195 | if (r < 0) |
07e4a8dc | 196 | return log_debug_errno(r, "Failed to replace specifiers: %m"); |
6501dd31 | 197 | |
baaa35ad | 198 | if (!dns_service_name_is_valid(name)) |
07e4a8dc RB |
199 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), |
200 | "Service instance name '%s' is invalid.", | |
201 | name); | |
6501dd31 | 202 | |
a3f87e32 YW |
203 | if (ret) |
204 | *ret = TAKE_PTR(name); | |
6501dd31 DR |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
209 | int dnssd_load(Manager *manager) { | |
210 | _cleanup_strv_free_ char **files = NULL; | |
6501dd31 DR |
211 | int r; |
212 | ||
213 | assert(manager); | |
214 | ||
215 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
216 | return 0; | |
217 | ||
eb5f4dde | 218 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, DNSSD_SERVICE_DIRS); |
6501dd31 DR |
219 | if (r < 0) |
220 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
221 | ||
222 | STRV_FOREACH_BACKWARDS(f, files) { | |
223 | r = dnssd_service_load(manager, *f); | |
224 | if (r < 0) | |
aea29a30 | 225 | log_warning_errno(r, "Failed to load '%s': %m", *f); |
6501dd31 DR |
226 | } |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
6db6a464 | 231 | int dnssd_update_rrs(DnssdService *s) { |
88123aa2 | 232 | _cleanup_free_ char *n = NULL, *service_name = NULL, *full_name = NULL, *sub_name = NULL, *selective_name = NULL; |
6db6a464 DR |
233 | int r; |
234 | ||
235 | assert(s); | |
400f54fb | 236 | assert(s->txt_data_items); |
6db6a464 DR |
237 | assert(s->manager); |
238 | ||
239 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
88123aa2 | 240 | s->sub_ptr_rr = dns_resource_record_unref(s->sub_ptr_rr); |
6db6a464 | 241 | s->srv_rr = dns_resource_record_unref(s->srv_rr); |
400f54fb DR |
242 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
243 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 | 244 | |
a3f87e32 | 245 | r = dnssd_render_instance_name(s->manager, s, &n); |
6db6a464 DR |
246 | if (r < 0) |
247 | return r; | |
248 | ||
7470cc4c | 249 | r = dns_name_concat(s->type, "local", 0, &service_name); |
6db6a464 DR |
250 | if (r < 0) |
251 | return r; | |
7470cc4c | 252 | r = dns_name_concat(n, service_name, 0, &full_name); |
6db6a464 DR |
253 | if (r < 0) |
254 | return r; | |
88123aa2 RP |
255 | if (s->subtype) { |
256 | r = dns_name_concat("_sub", service_name, 0, &sub_name); | |
257 | if (r < 0) | |
258 | return r; | |
259 | r = dns_name_concat(s->subtype, sub_name, 0, &selective_name); | |
260 | if (r < 0) | |
261 | return r; | |
262 | } | |
6db6a464 | 263 | |
400f54fb DR |
264 | LIST_FOREACH(items, txt_data, s->txt_data_items) { |
265 | txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT, | |
266 | full_name); | |
267 | if (!txt_data->rr) | |
268 | goto oom; | |
6db6a464 | 269 | |
400f54fb | 270 | txt_data->rr->ttl = MDNS_DEFAULT_TTL; |
d70f15f5 | 271 | txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txts); |
400f54fb DR |
272 | if (!txt_data->rr->txt.items) |
273 | goto oom; | |
274 | } | |
6db6a464 DR |
275 | |
276 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
277 | service_name); | |
278 | if (!s->ptr_rr) | |
279 | goto oom; | |
280 | ||
281 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
282 | s->ptr_rr->ptr.name = strdup(full_name); | |
283 | if (!s->ptr_rr->ptr.name) | |
284 | goto oom; | |
285 | ||
88123aa2 RP |
286 | if (selective_name) { |
287 | s->sub_ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, selective_name); | |
288 | if (!s->sub_ptr_rr) | |
289 | goto oom; | |
290 | ||
291 | s->sub_ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
292 | s->sub_ptr_rr->ptr.name = strdup(full_name); | |
293 | if (!s->sub_ptr_rr->ptr.name) | |
294 | goto oom; | |
295 | } | |
296 | ||
6db6a464 DR |
297 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, |
298 | full_name); | |
299 | if (!s->srv_rr) | |
300 | goto oom; | |
301 | ||
302 | s->srv_rr->ttl = MDNS_DEFAULT_TTL; | |
303 | s->srv_rr->srv.priority = s->priority; | |
304 | s->srv_rr->srv.weight = s->weight; | |
305 | s->srv_rr->srv.port = s->port; | |
306 | s->srv_rr->srv.name = strdup(s->manager->mdns_hostname); | |
307 | if (!s->srv_rr->srv.name) | |
308 | goto oom; | |
309 | ||
310 | return 0; | |
311 | ||
312 | oom: | |
400f54fb DR |
313 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
314 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 | 315 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
88123aa2 | 316 | s->sub_ptr_rr = dns_resource_record_unref(s->sub_ptr_rr); |
6db6a464 DR |
317 | s->srv_rr = dns_resource_record_unref(s->srv_rr); |
318 | return -ENOMEM; | |
319 | } | |
320 | ||
6501dd31 DR |
321 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
322 | size_t length; | |
323 | DnsTxtItem *i; | |
324 | ||
325 | length = strlen(key); | |
326 | ||
327 | if (!isempty(value)) | |
328 | length += strlen(value) + 1; /* length of value plus '=' */ | |
329 | ||
330 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
331 | if (!i) | |
332 | return -ENOMEM; | |
333 | ||
334 | memcpy(i->data, key, strlen(key)); | |
335 | if (!isempty(value)) { | |
336 | memcpy(i->data + strlen(key), "=", 1); | |
337 | memcpy(i->data + strlen(key) + 1, value, strlen(value)); | |
338 | } | |
339 | i->length = length; | |
340 | ||
ae2a15bc | 341 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
342 | |
343 | return 0; | |
344 | } | |
345 | ||
346 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
347 | size_t length; | |
348 | DnsTxtItem *i; | |
349 | ||
350 | length = strlen(key); | |
351 | ||
352 | if (size > 0) | |
353 | length += size + 1; /* size of date plus '=' */ | |
354 | ||
355 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
356 | if (!i) | |
357 | return -ENOMEM; | |
358 | ||
359 | memcpy(i->data, key, strlen(key)); | |
360 | if (size > 0) { | |
361 | memcpy(i->data + strlen(key), "=", 1); | |
362 | memcpy(i->data + strlen(key) + 1, data, size); | |
363 | } | |
364 | i->length = length; | |
365 | ||
ae2a15bc | 366 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
367 | |
368 | return 0; | |
369 | } | |
c3036641 | 370 | |
b8d6689a | 371 | int dnssd_signal_conflict(Manager *manager, const char *name) { |
c3036641 DR |
372 | DnssdService *s; |
373 | int r; | |
374 | ||
b8d6689a YW |
375 | if (sd_bus_is_ready(manager->bus) <= 0) |
376 | return 0; | |
377 | ||
90e74a66 | 378 | HASHMAP_FOREACH(s, manager->dnssd_services) { |
c3036641 DR |
379 | if (s->withdrawn) |
380 | continue; | |
381 | ||
3ee27b25 | 382 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name) > 0) { |
c3036641 DR |
383 | _cleanup_free_ char *path = NULL; |
384 | ||
385 | s->withdrawn = true; | |
386 | ||
0ef0e269 | 387 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->id, &path); |
b8d6689a YW |
388 | if (r < 0) |
389 | return log_error_errno(r, "Can't get D-BUS object path: %m"); | |
c3036641 DR |
390 | |
391 | r = sd_bus_emit_signal(manager->bus, | |
392 | path, | |
393 | "org.freedesktop.resolve1.DnssdService", | |
394 | "Conflicted", | |
395 | NULL); | |
b8d6689a YW |
396 | if (r < 0) |
397 | return log_error_errno(r, "Cannot emit signal: %m"); | |
c3036641 DR |
398 | |
399 | break; | |
400 | } | |
401 | } | |
b8d6689a YW |
402 | |
403 | return 0; | |
c3036641 | 404 | } |