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514fbdd7 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
6501dd31 DR |
2 | |
3 | #include "conf-files.h" | |
4 | #include "conf-parser.h" | |
eb5f4dde | 5 | #include "def.h" |
6501dd31 DR |
6 | #include "resolved-dnssd.h" |
7 | #include "resolved-dns-rr.h" | |
8 | #include "resolved-manager.h" | |
9 | #include "specifier.h" | |
10 | #include "strv.h" | |
11 | ||
eb5f4dde | 12 | #define DNSSD_SERVICE_DIRS ((const char* const*) CONF_PATHS_STRV("systemd/dnssd")) |
6501dd31 | 13 | |
400f54fb DR |
14 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
15 | if (!txt_data) | |
16 | return NULL; | |
17 | ||
18 | dns_resource_record_unref(txt_data->rr); | |
19 | dns_txt_item_free_all(txt_data->txt); | |
20 | ||
21 | return mfree(txt_data); | |
22 | } | |
23 | ||
24 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
25 | DnssdTxtData *next; | |
26 | ||
27 | if (!txt_data) | |
28 | return NULL; | |
29 | ||
30 | next = txt_data->items_next; | |
31 | ||
32 | dnssd_txtdata_free(txt_data); | |
33 | ||
34 | return dnssd_txtdata_free_all(next); | |
35 | } | |
36 | ||
6501dd31 DR |
37 | DnssdService *dnssd_service_free(DnssdService *service) { |
38 | if (!service) | |
39 | return NULL; | |
40 | ||
41 | if (service->manager) | |
42 | hashmap_remove(service->manager->dnssd_services, service->name); | |
43 | ||
44 | dns_resource_record_unref(service->ptr_rr); | |
45 | dns_resource_record_unref(service->srv_rr); | |
400f54fb DR |
46 | |
47 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 DR |
48 | |
49 | free(service->filename); | |
50 | free(service->name); | |
51 | free(service->type); | |
52 | free(service->name_template); | |
6501dd31 DR |
53 | |
54 | return mfree(service); | |
55 | } | |
56 | ||
57 | static int dnssd_service_load(Manager *manager, const char *filename) { | |
58 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; | |
400f54fb | 59 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
6501dd31 DR |
60 | char *d; |
61 | const char *dropin_dirname; | |
62 | int r; | |
63 | ||
64 | assert(manager); | |
65 | assert(filename); | |
66 | ||
67 | service = new0(DnssdService, 1); | |
68 | if (!service) | |
69 | return log_oom(); | |
70 | ||
71 | service->filename = strdup(filename); | |
72 | if (!service->filename) | |
73 | return log_oom(); | |
74 | ||
75 | service->name = strdup(basename(filename)); | |
76 | if (!service->name) | |
77 | return log_oom(); | |
78 | ||
79 | d = endswith(service->name, ".dnssd"); | |
80 | if (!d) | |
81 | return -EINVAL; | |
82 | ||
83 | assert(streq(d, ".dnssd")); | |
84 | ||
85 | *d = '\0'; | |
86 | ||
87 | dropin_dirname = strjoina(service->name, ".dnssd.d"); | |
88 | ||
4f9ff96a LP |
89 | r = config_parse_many( |
90 | filename, DNSSD_SERVICE_DIRS, dropin_dirname, | |
91 | "Service\0", | |
92 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
93 | CONFIG_PARSE_WARN, | |
94 | service, | |
95 | NULL); | |
6501dd31 DR |
96 | if (r < 0) |
97 | return r; | |
98 | ||
99 | if (!service->name_template) { | |
100 | log_error("%s doesn't define service instance name", service->name); | |
101 | return -EINVAL; | |
102 | } | |
103 | ||
104 | if (!service->type) { | |
105 | log_error("%s doesn't define service type", service->name); | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
400f54fb DR |
109 | if (LIST_IS_EMPTY(service->txt_data_items)) { |
110 | txt_data = new0(DnssdTxtData, 1); | |
111 | if (!txt_data) | |
112 | return log_oom(); | |
113 | ||
114 | r = dns_txt_item_new_empty(&txt_data->txt); | |
6501dd31 DR |
115 | if (r < 0) |
116 | return r; | |
400f54fb DR |
117 | |
118 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
119 | txt_data = NULL; | |
6501dd31 DR |
120 | } |
121 | ||
122 | r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops); | |
123 | if (r < 0) | |
124 | return r; | |
125 | ||
126 | r = hashmap_put(manager->dnssd_services, service->name, service); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | service->manager = manager; | |
131 | ||
6db6a464 DR |
132 | r = dnssd_update_rrs(service); |
133 | if (r < 0) | |
134 | return r; | |
135 | ||
6501dd31 DR |
136 | service = NULL; |
137 | ||
138 | return 0; | |
139 | } | |
140 | ||
303ee601 | 141 | static int specifier_dnssd_host_name(char specifier, const void *data, const void *userdata, char **ret) { |
6501dd31 DR |
142 | DnssdService *s = (DnssdService *) userdata; |
143 | char *n; | |
144 | ||
145 | assert(s); | |
146 | assert(s->manager); | |
147 | assert(s->manager->llmnr_hostname); | |
148 | ||
149 | n = strdup(s->manager->llmnr_hostname); | |
150 | if (!n) | |
151 | return -ENOMEM; | |
152 | ||
153 | *ret = n; | |
154 | return 0; | |
155 | } | |
156 | ||
157 | int dnssd_render_instance_name(DnssdService *s, char **ret_name) { | |
158 | static const Specifier specifier_table[] = { | |
268f5a54 | 159 | { 'm', specifier_machine_id, NULL }, |
6501dd31 DR |
160 | { 'b', specifier_boot_id, NULL }, |
161 | { 'H', specifier_dnssd_host_name, NULL }, | |
6501dd31 | 162 | { 'v', specifier_kernel_release, NULL }, |
268f5a54 LP |
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 }, | |
6501dd31 DR |
168 | {} |
169 | }; | |
170 | _cleanup_free_ char *name = NULL; | |
171 | int r; | |
172 | ||
173 | assert(s); | |
174 | assert(s->name_template); | |
175 | ||
176 | r = specifier_printf(s->name_template, specifier_table, s, &name); | |
177 | if (r < 0) | |
178 | return log_debug_errno(r, "Failed to replace specifiers: %m"); | |
179 | ||
baaa35ad ZJS |
180 | if (!dns_service_name_is_valid(name)) |
181 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
182 | "Service instance name '%s' is invalid.", | |
183 | name); | |
6501dd31 | 184 | |
ae2a15bc | 185 | *ret_name = TAKE_PTR(name); |
6501dd31 DR |
186 | |
187 | return 0; | |
188 | } | |
189 | ||
190 | int dnssd_load(Manager *manager) { | |
191 | _cleanup_strv_free_ char **files = NULL; | |
192 | char **f; | |
193 | int r; | |
194 | ||
195 | assert(manager); | |
196 | ||
197 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
198 | return 0; | |
199 | ||
eb5f4dde | 200 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, DNSSD_SERVICE_DIRS); |
6501dd31 DR |
201 | if (r < 0) |
202 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
203 | ||
204 | STRV_FOREACH_BACKWARDS(f, files) { | |
205 | r = dnssd_service_load(manager, *f); | |
206 | if (r < 0) | |
207 | log_warning_errno(r, "Failed to load '%s': %m", *f);; | |
208 | } | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
6db6a464 DR |
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; | |
400f54fb | 217 | DnssdTxtData *txt_data; |
6db6a464 DR |
218 | int r; |
219 | ||
220 | assert(s); | |
400f54fb | 221 | assert(s->txt_data_items); |
6db6a464 DR |
222 | assert(s->manager); |
223 | ||
224 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
225 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
400f54fb DR |
226 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
227 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
228 | |
229 | r = dnssd_render_instance_name(s, &n); | |
230 | if (r < 0) | |
231 | return r; | |
232 | ||
7470cc4c | 233 | r = dns_name_concat(s->type, "local", 0, &service_name); |
6db6a464 DR |
234 | if (r < 0) |
235 | return r; | |
7470cc4c | 236 | r = dns_name_concat(n, service_name, 0, &full_name); |
6db6a464 DR |
237 | if (r < 0) |
238 | return r; | |
239 | ||
400f54fb DR |
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, | |
242 | full_name); | |
243 | if (!txt_data->rr) | |
244 | goto oom; | |
6db6a464 | 245 | |
400f54fb DR |
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) | |
249 | goto oom; | |
250 | } | |
6db6a464 DR |
251 | |
252 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
253 | service_name); | |
254 | if (!s->ptr_rr) | |
255 | goto oom; | |
256 | ||
257 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
258 | s->ptr_rr->ptr.name = strdup(full_name); | |
259 | if (!s->ptr_rr->ptr.name) | |
260 | goto oom; | |
261 | ||
262 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, | |
263 | full_name); | |
264 | if (!s->srv_rr) | |
265 | goto oom; | |
266 | ||
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) | |
273 | goto oom; | |
274 | ||
275 | return 0; | |
276 | ||
277 | oom: | |
400f54fb DR |
278 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
279 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
280 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
281 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
282 | return -ENOMEM; | |
283 | } | |
284 | ||
6501dd31 DR |
285 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
286 | size_t length; | |
287 | DnsTxtItem *i; | |
288 | ||
289 | length = strlen(key); | |
290 | ||
291 | if (!isempty(value)) | |
292 | length += strlen(value) + 1; /* length of value plus '=' */ | |
293 | ||
294 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
295 | if (!i) | |
296 | return -ENOMEM; | |
297 | ||
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)); | |
302 | } | |
303 | i->length = length; | |
304 | ||
ae2a15bc | 305 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
306 | |
307 | return 0; | |
308 | } | |
309 | ||
310 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
311 | size_t length; | |
312 | DnsTxtItem *i; | |
313 | ||
314 | length = strlen(key); | |
315 | ||
316 | if (size > 0) | |
317 | length += size + 1; /* size of date plus '=' */ | |
318 | ||
319 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
320 | if (!i) | |
321 | return -ENOMEM; | |
322 | ||
323 | memcpy(i->data, key, strlen(key)); | |
324 | if (size > 0) { | |
325 | memcpy(i->data + strlen(key), "=", 1); | |
326 | memcpy(i->data + strlen(key) + 1, data, size); | |
327 | } | |
328 | i->length = length; | |
329 | ||
ae2a15bc | 330 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
331 | |
332 | return 0; | |
333 | } | |
c3036641 DR |
334 | |
335 | void dnssd_signal_conflict(Manager *manager, const char *name) { | |
336 | Iterator i; | |
337 | DnssdService *s; | |
338 | int r; | |
339 | ||
340 | HASHMAP_FOREACH(s, manager->dnssd_services, i) { | |
341 | if (s->withdrawn) | |
342 | continue; | |
343 | ||
344 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) { | |
345 | _cleanup_free_ char *path = NULL; | |
346 | ||
347 | s->withdrawn = true; | |
348 | ||
349 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path); | |
350 | if (r < 0) { | |
351 | log_error_errno(r, "Can't get D-BUS object path: %m"); | |
352 | return; | |
353 | } | |
354 | ||
355 | r = sd_bus_emit_signal(manager->bus, | |
356 | path, | |
357 | "org.freedesktop.resolve1.DnssdService", | |
358 | "Conflicted", | |
359 | NULL); | |
360 | if (r < 0) { | |
361 | log_error_errno(r, "Cannot emit signal: %m"); | |
362 | return; | |
363 | } | |
364 | ||
365 | break; | |
366 | } | |
367 | } | |
368 | } |