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6501dd31 DR |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2017 Dmitry Rozhkov | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include "conf-files.h" | |
21 | #include "conf-parser.h" | |
22 | #include "resolved-dnssd.h" | |
23 | #include "resolved-dns-rr.h" | |
24 | #include "resolved-manager.h" | |
25 | #include "specifier.h" | |
26 | #include "strv.h" | |
27 | ||
28 | const char* const dnssd_service_dirs[] = { | |
29 | "/etc/systemd/dnssd", | |
30 | "/run/systemd/dnssd", | |
31 | "/usr/lib/systemd/dnssd", | |
32 | #ifdef HAVE_SPLIT_USR | |
33 | "/lib/systemd/dnssd", | |
34 | #endif | |
35 | NULL | |
36 | }; | |
37 | ||
400f54fb DR |
38 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
39 | if (!txt_data) | |
40 | return NULL; | |
41 | ||
42 | dns_resource_record_unref(txt_data->rr); | |
43 | dns_txt_item_free_all(txt_data->txt); | |
44 | ||
45 | return mfree(txt_data); | |
46 | } | |
47 | ||
48 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
49 | DnssdTxtData *next; | |
50 | ||
51 | if (!txt_data) | |
52 | return NULL; | |
53 | ||
54 | next = txt_data->items_next; | |
55 | ||
56 | dnssd_txtdata_free(txt_data); | |
57 | ||
58 | return dnssd_txtdata_free_all(next); | |
59 | } | |
60 | ||
6501dd31 DR |
61 | DnssdService *dnssd_service_free(DnssdService *service) { |
62 | if (!service) | |
63 | return NULL; | |
64 | ||
65 | if (service->manager) | |
66 | hashmap_remove(service->manager->dnssd_services, service->name); | |
67 | ||
68 | dns_resource_record_unref(service->ptr_rr); | |
69 | dns_resource_record_unref(service->srv_rr); | |
400f54fb DR |
70 | |
71 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 DR |
72 | |
73 | free(service->filename); | |
74 | free(service->name); | |
75 | free(service->type); | |
76 | free(service->name_template); | |
6501dd31 DR |
77 | |
78 | return mfree(service); | |
79 | } | |
80 | ||
81 | static int dnssd_service_load(Manager *manager, const char *filename) { | |
82 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; | |
400f54fb | 83 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
6501dd31 DR |
84 | char *d; |
85 | const char *dropin_dirname; | |
86 | int r; | |
87 | ||
88 | assert(manager); | |
89 | assert(filename); | |
90 | ||
91 | service = new0(DnssdService, 1); | |
92 | if (!service) | |
93 | return log_oom(); | |
94 | ||
95 | service->filename = strdup(filename); | |
96 | if (!service->filename) | |
97 | return log_oom(); | |
98 | ||
99 | service->name = strdup(basename(filename)); | |
100 | if (!service->name) | |
101 | return log_oom(); | |
102 | ||
103 | d = endswith(service->name, ".dnssd"); | |
104 | if (!d) | |
105 | return -EINVAL; | |
106 | ||
107 | assert(streq(d, ".dnssd")); | |
108 | ||
109 | *d = '\0'; | |
110 | ||
111 | dropin_dirname = strjoina(service->name, ".dnssd.d"); | |
112 | ||
113 | r = config_parse_many(filename, dnssd_service_dirs, dropin_dirname, | |
114 | "Service\0", | |
115 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
116 | false, service); | |
117 | if (r < 0) | |
118 | return r; | |
119 | ||
120 | if (!service->name_template) { | |
121 | log_error("%s doesn't define service instance name", service->name); | |
122 | return -EINVAL; | |
123 | } | |
124 | ||
125 | if (!service->type) { | |
126 | log_error("%s doesn't define service type", service->name); | |
127 | return -EINVAL; | |
128 | } | |
129 | ||
400f54fb DR |
130 | if (LIST_IS_EMPTY(service->txt_data_items)) { |
131 | txt_data = new0(DnssdTxtData, 1); | |
132 | if (!txt_data) | |
133 | return log_oom(); | |
134 | ||
135 | r = dns_txt_item_new_empty(&txt_data->txt); | |
6501dd31 DR |
136 | if (r < 0) |
137 | return r; | |
400f54fb DR |
138 | |
139 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
140 | txt_data = NULL; | |
6501dd31 DR |
141 | } |
142 | ||
143 | r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops); | |
144 | if (r < 0) | |
145 | return r; | |
146 | ||
147 | r = hashmap_put(manager->dnssd_services, service->name, service); | |
148 | if (r < 0) | |
149 | return r; | |
150 | ||
151 | service->manager = manager; | |
152 | ||
6db6a464 DR |
153 | r = dnssd_update_rrs(service); |
154 | if (r < 0) | |
155 | return r; | |
156 | ||
6501dd31 DR |
157 | service = NULL; |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static int specifier_dnssd_host_name(char specifier, void *data, void *userdata, char **ret) { | |
163 | DnssdService *s = (DnssdService *) userdata; | |
164 | char *n; | |
165 | ||
166 | assert(s); | |
167 | assert(s->manager); | |
168 | assert(s->manager->llmnr_hostname); | |
169 | ||
170 | n = strdup(s->manager->llmnr_hostname); | |
171 | if (!n) | |
172 | return -ENOMEM; | |
173 | ||
174 | *ret = n; | |
175 | return 0; | |
176 | } | |
177 | ||
178 | int dnssd_render_instance_name(DnssdService *s, char **ret_name) { | |
179 | static const Specifier specifier_table[] = { | |
180 | { 'b', specifier_boot_id, NULL }, | |
181 | { 'H', specifier_dnssd_host_name, NULL }, | |
182 | { 'm', specifier_machine_id, NULL }, | |
183 | { 'v', specifier_kernel_release, NULL }, | |
184 | {} | |
185 | }; | |
186 | _cleanup_free_ char *name = NULL; | |
187 | int r; | |
188 | ||
189 | assert(s); | |
190 | assert(s->name_template); | |
191 | ||
192 | r = specifier_printf(s->name_template, specifier_table, s, &name); | |
193 | if (r < 0) | |
194 | return log_debug_errno(r, "Failed to replace specifiers: %m"); | |
195 | ||
196 | if (!dns_service_name_is_valid(name)) { | |
197 | log_debug("Service instance name '%s' is invalid.", name); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
ae2a15bc | 201 | *ret_name = TAKE_PTR(name); |
6501dd31 DR |
202 | |
203 | return 0; | |
204 | } | |
205 | ||
206 | int dnssd_load(Manager *manager) { | |
207 | _cleanup_strv_free_ char **files = NULL; | |
208 | char **f; | |
209 | int r; | |
210 | ||
211 | assert(manager); | |
212 | ||
213 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
214 | return 0; | |
215 | ||
216 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, dnssd_service_dirs); | |
217 | if (r < 0) | |
218 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
219 | ||
220 | STRV_FOREACH_BACKWARDS(f, files) { | |
221 | r = dnssd_service_load(manager, *f); | |
222 | if (r < 0) | |
223 | log_warning_errno(r, "Failed to load '%s': %m", *f);; | |
224 | } | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
6db6a464 DR |
229 | int dnssd_update_rrs(DnssdService *s) { |
230 | _cleanup_free_ char *n = NULL; | |
231 | _cleanup_free_ char *service_name = NULL; | |
232 | _cleanup_free_ char *full_name = NULL; | |
400f54fb | 233 | DnssdTxtData *txt_data; |
6db6a464 DR |
234 | int r; |
235 | ||
236 | assert(s); | |
400f54fb | 237 | assert(s->txt_data_items); |
6db6a464 DR |
238 | assert(s->manager); |
239 | ||
240 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
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 DR |
244 | |
245 | r = dnssd_render_instance_name(s, &n); | |
246 | if (r < 0) | |
247 | return r; | |
248 | ||
249 | r = dns_name_concat(s->type, "local", &service_name); | |
250 | if (r < 0) | |
251 | return r; | |
252 | r = dns_name_concat(n, service_name, &full_name); | |
253 | if (r < 0) | |
254 | return r; | |
255 | ||
400f54fb DR |
256 | LIST_FOREACH(items, txt_data, s->txt_data_items) { |
257 | txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT, | |
258 | full_name); | |
259 | if (!txt_data->rr) | |
260 | goto oom; | |
6db6a464 | 261 | |
400f54fb DR |
262 | txt_data->rr->ttl = MDNS_DEFAULT_TTL; |
263 | txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt); | |
264 | if (!txt_data->rr->txt.items) | |
265 | goto oom; | |
266 | } | |
6db6a464 DR |
267 | |
268 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
269 | service_name); | |
270 | if (!s->ptr_rr) | |
271 | goto oom; | |
272 | ||
273 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
274 | s->ptr_rr->ptr.name = strdup(full_name); | |
275 | if (!s->ptr_rr->ptr.name) | |
276 | goto oom; | |
277 | ||
278 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, | |
279 | full_name); | |
280 | if (!s->srv_rr) | |
281 | goto oom; | |
282 | ||
283 | s->srv_rr->ttl = MDNS_DEFAULT_TTL; | |
284 | s->srv_rr->srv.priority = s->priority; | |
285 | s->srv_rr->srv.weight = s->weight; | |
286 | s->srv_rr->srv.port = s->port; | |
287 | s->srv_rr->srv.name = strdup(s->manager->mdns_hostname); | |
288 | if (!s->srv_rr->srv.name) | |
289 | goto oom; | |
290 | ||
291 | return 0; | |
292 | ||
293 | oom: | |
400f54fb DR |
294 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
295 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
296 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
297 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
298 | return -ENOMEM; | |
299 | } | |
300 | ||
6501dd31 DR |
301 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
302 | size_t length; | |
303 | DnsTxtItem *i; | |
304 | ||
305 | length = strlen(key); | |
306 | ||
307 | if (!isempty(value)) | |
308 | length += strlen(value) + 1; /* length of value plus '=' */ | |
309 | ||
310 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
311 | if (!i) | |
312 | return -ENOMEM; | |
313 | ||
314 | memcpy(i->data, key, strlen(key)); | |
315 | if (!isempty(value)) { | |
316 | memcpy(i->data + strlen(key), "=", 1); | |
317 | memcpy(i->data + strlen(key) + 1, value, strlen(value)); | |
318 | } | |
319 | i->length = length; | |
320 | ||
ae2a15bc | 321 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
322 | |
323 | return 0; | |
324 | } | |
325 | ||
326 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
327 | size_t length; | |
328 | DnsTxtItem *i; | |
329 | ||
330 | length = strlen(key); | |
331 | ||
332 | if (size > 0) | |
333 | length += size + 1; /* size of date plus '=' */ | |
334 | ||
335 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
336 | if (!i) | |
337 | return -ENOMEM; | |
338 | ||
339 | memcpy(i->data, key, strlen(key)); | |
340 | if (size > 0) { | |
341 | memcpy(i->data + strlen(key), "=", 1); | |
342 | memcpy(i->data + strlen(key) + 1, data, size); | |
343 | } | |
344 | i->length = length; | |
345 | ||
ae2a15bc | 346 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
347 | |
348 | return 0; | |
349 | } | |
c3036641 DR |
350 | |
351 | void dnssd_signal_conflict(Manager *manager, const char *name) { | |
352 | Iterator i; | |
353 | DnssdService *s; | |
354 | int r; | |
355 | ||
356 | HASHMAP_FOREACH(s, manager->dnssd_services, i) { | |
357 | if (s->withdrawn) | |
358 | continue; | |
359 | ||
360 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) { | |
361 | _cleanup_free_ char *path = NULL; | |
362 | ||
363 | s->withdrawn = true; | |
364 | ||
365 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path); | |
366 | if (r < 0) { | |
367 | log_error_errno(r, "Can't get D-BUS object path: %m"); | |
368 | return; | |
369 | } | |
370 | ||
371 | r = sd_bus_emit_signal(manager->bus, | |
372 | path, | |
373 | "org.freedesktop.resolve1.DnssdService", | |
374 | "Conflicted", | |
375 | NULL); | |
376 | if (r < 0) { | |
377 | log_error_errno(r, "Cannot emit signal: %m"); | |
378 | return; | |
379 | } | |
380 | ||
381 | break; | |
382 | } | |
383 | } | |
384 | } |