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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" | |
5 | #include "resolved-dnssd.h" | |
6 | #include "resolved-dns-rr.h" | |
7 | #include "resolved-manager.h" | |
8 | #include "specifier.h" | |
9 | #include "strv.h" | |
10 | ||
11 | const char* const dnssd_service_dirs[] = { | |
12 | "/etc/systemd/dnssd", | |
13 | "/run/systemd/dnssd", | |
14 | "/usr/lib/systemd/dnssd", | |
545cdb90 | 15 | #if HAVE_SPLIT_USR |
6501dd31 DR |
16 | "/lib/systemd/dnssd", |
17 | #endif | |
18 | NULL | |
19 | }; | |
20 | ||
400f54fb DR |
21 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
22 | if (!txt_data) | |
23 | return NULL; | |
24 | ||
25 | dns_resource_record_unref(txt_data->rr); | |
26 | dns_txt_item_free_all(txt_data->txt); | |
27 | ||
28 | return mfree(txt_data); | |
29 | } | |
30 | ||
31 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
32 | DnssdTxtData *next; | |
33 | ||
34 | if (!txt_data) | |
35 | return NULL; | |
36 | ||
37 | next = txt_data->items_next; | |
38 | ||
39 | dnssd_txtdata_free(txt_data); | |
40 | ||
41 | return dnssd_txtdata_free_all(next); | |
42 | } | |
43 | ||
6501dd31 DR |
44 | DnssdService *dnssd_service_free(DnssdService *service) { |
45 | if (!service) | |
46 | return NULL; | |
47 | ||
48 | if (service->manager) | |
49 | hashmap_remove(service->manager->dnssd_services, service->name); | |
50 | ||
51 | dns_resource_record_unref(service->ptr_rr); | |
52 | dns_resource_record_unref(service->srv_rr); | |
400f54fb DR |
53 | |
54 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 DR |
55 | |
56 | free(service->filename); | |
57 | free(service->name); | |
58 | free(service->type); | |
59 | free(service->name_template); | |
6501dd31 DR |
60 | |
61 | return mfree(service); | |
62 | } | |
63 | ||
64 | static int dnssd_service_load(Manager *manager, const char *filename) { | |
65 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; | |
400f54fb | 66 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
6501dd31 DR |
67 | char *d; |
68 | const char *dropin_dirname; | |
69 | int r; | |
70 | ||
71 | assert(manager); | |
72 | assert(filename); | |
73 | ||
74 | service = new0(DnssdService, 1); | |
75 | if (!service) | |
76 | return log_oom(); | |
77 | ||
78 | service->filename = strdup(filename); | |
79 | if (!service->filename) | |
80 | return log_oom(); | |
81 | ||
82 | service->name = strdup(basename(filename)); | |
83 | if (!service->name) | |
84 | return log_oom(); | |
85 | ||
86 | d = endswith(service->name, ".dnssd"); | |
87 | if (!d) | |
88 | return -EINVAL; | |
89 | ||
90 | assert(streq(d, ".dnssd")); | |
91 | ||
92 | *d = '\0'; | |
93 | ||
94 | dropin_dirname = strjoina(service->name, ".dnssd.d"); | |
95 | ||
96 | r = config_parse_many(filename, dnssd_service_dirs, dropin_dirname, | |
97 | "Service\0", | |
98 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
99 | false, service); | |
100 | if (r < 0) | |
101 | return r; | |
102 | ||
103 | if (!service->name_template) { | |
104 | log_error("%s doesn't define service instance name", service->name); | |
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | if (!service->type) { | |
109 | log_error("%s doesn't define service type", service->name); | |
110 | return -EINVAL; | |
111 | } | |
112 | ||
400f54fb DR |
113 | if (LIST_IS_EMPTY(service->txt_data_items)) { |
114 | txt_data = new0(DnssdTxtData, 1); | |
115 | if (!txt_data) | |
116 | return log_oom(); | |
117 | ||
118 | r = dns_txt_item_new_empty(&txt_data->txt); | |
6501dd31 DR |
119 | if (r < 0) |
120 | return r; | |
400f54fb DR |
121 | |
122 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
123 | txt_data = NULL; | |
6501dd31 DR |
124 | } |
125 | ||
126 | r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops); | |
127 | if (r < 0) | |
128 | return r; | |
129 | ||
130 | r = hashmap_put(manager->dnssd_services, service->name, service); | |
131 | if (r < 0) | |
132 | return r; | |
133 | ||
134 | service->manager = manager; | |
135 | ||
6db6a464 DR |
136 | r = dnssd_update_rrs(service); |
137 | if (r < 0) | |
138 | return r; | |
139 | ||
6501dd31 DR |
140 | service = NULL; |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
303ee601 | 145 | static int specifier_dnssd_host_name(char specifier, const void *data, const void *userdata, char **ret) { |
6501dd31 DR |
146 | DnssdService *s = (DnssdService *) userdata; |
147 | char *n; | |
148 | ||
149 | assert(s); | |
150 | assert(s->manager); | |
151 | assert(s->manager->llmnr_hostname); | |
152 | ||
153 | n = strdup(s->manager->llmnr_hostname); | |
154 | if (!n) | |
155 | return -ENOMEM; | |
156 | ||
157 | *ret = n; | |
158 | return 0; | |
159 | } | |
160 | ||
161 | int dnssd_render_instance_name(DnssdService *s, char **ret_name) { | |
162 | static const Specifier specifier_table[] = { | |
163 | { 'b', specifier_boot_id, NULL }, | |
164 | { 'H', specifier_dnssd_host_name, NULL }, | |
24eb8621 | 165 | { 'm', specifier_machine_id, NULL }, |
6501dd31 DR |
166 | { 'v', specifier_kernel_release, NULL }, |
167 | {} | |
168 | }; | |
169 | _cleanup_free_ char *name = NULL; | |
170 | int r; | |
171 | ||
172 | assert(s); | |
173 | assert(s->name_template); | |
174 | ||
175 | r = specifier_printf(s->name_template, specifier_table, s, &name); | |
176 | if (r < 0) | |
177 | return log_debug_errno(r, "Failed to replace specifiers: %m"); | |
178 | ||
baaa35ad ZJS |
179 | if (!dns_service_name_is_valid(name)) |
180 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
181 | "Service instance name '%s' is invalid.", | |
182 | name); | |
6501dd31 | 183 | |
ae2a15bc | 184 | *ret_name = TAKE_PTR(name); |
6501dd31 DR |
185 | |
186 | return 0; | |
187 | } | |
188 | ||
189 | int dnssd_load(Manager *manager) { | |
190 | _cleanup_strv_free_ char **files = NULL; | |
191 | char **f; | |
192 | int r; | |
193 | ||
194 | assert(manager); | |
195 | ||
196 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
197 | return 0; | |
198 | ||
199 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, dnssd_service_dirs); | |
200 | if (r < 0) | |
201 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
202 | ||
203 | STRV_FOREACH_BACKWARDS(f, files) { | |
204 | r = dnssd_service_load(manager, *f); | |
205 | if (r < 0) | |
206 | log_warning_errno(r, "Failed to load '%s': %m", *f);; | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
6db6a464 DR |
212 | int dnssd_update_rrs(DnssdService *s) { |
213 | _cleanup_free_ char *n = NULL; | |
214 | _cleanup_free_ char *service_name = NULL; | |
215 | _cleanup_free_ char *full_name = NULL; | |
400f54fb | 216 | DnssdTxtData *txt_data; |
6db6a464 DR |
217 | int r; |
218 | ||
219 | assert(s); | |
400f54fb | 220 | assert(s->txt_data_items); |
6db6a464 DR |
221 | assert(s->manager); |
222 | ||
223 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
224 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
400f54fb DR |
225 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
226 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
227 | |
228 | r = dnssd_render_instance_name(s, &n); | |
229 | if (r < 0) | |
230 | return r; | |
231 | ||
7470cc4c | 232 | r = dns_name_concat(s->type, "local", 0, &service_name); |
6db6a464 DR |
233 | if (r < 0) |
234 | return r; | |
7470cc4c | 235 | r = dns_name_concat(n, service_name, 0, &full_name); |
6db6a464 DR |
236 | if (r < 0) |
237 | return r; | |
238 | ||
400f54fb DR |
239 | LIST_FOREACH(items, txt_data, s->txt_data_items) { |
240 | txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT, | |
241 | full_name); | |
242 | if (!txt_data->rr) | |
243 | goto oom; | |
6db6a464 | 244 | |
400f54fb DR |
245 | txt_data->rr->ttl = MDNS_DEFAULT_TTL; |
246 | txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt); | |
247 | if (!txt_data->rr->txt.items) | |
248 | goto oom; | |
249 | } | |
6db6a464 DR |
250 | |
251 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
252 | service_name); | |
253 | if (!s->ptr_rr) | |
254 | goto oom; | |
255 | ||
256 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
257 | s->ptr_rr->ptr.name = strdup(full_name); | |
258 | if (!s->ptr_rr->ptr.name) | |
259 | goto oom; | |
260 | ||
261 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, | |
262 | full_name); | |
263 | if (!s->srv_rr) | |
264 | goto oom; | |
265 | ||
266 | s->srv_rr->ttl = MDNS_DEFAULT_TTL; | |
267 | s->srv_rr->srv.priority = s->priority; | |
268 | s->srv_rr->srv.weight = s->weight; | |
269 | s->srv_rr->srv.port = s->port; | |
270 | s->srv_rr->srv.name = strdup(s->manager->mdns_hostname); | |
271 | if (!s->srv_rr->srv.name) | |
272 | goto oom; | |
273 | ||
274 | return 0; | |
275 | ||
276 | oom: | |
400f54fb DR |
277 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
278 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
279 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
280 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
281 | return -ENOMEM; | |
282 | } | |
283 | ||
6501dd31 DR |
284 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
285 | size_t length; | |
286 | DnsTxtItem *i; | |
287 | ||
288 | length = strlen(key); | |
289 | ||
290 | if (!isempty(value)) | |
291 | length += strlen(value) + 1; /* length of value plus '=' */ | |
292 | ||
293 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
294 | if (!i) | |
295 | return -ENOMEM; | |
296 | ||
297 | memcpy(i->data, key, strlen(key)); | |
298 | if (!isempty(value)) { | |
299 | memcpy(i->data + strlen(key), "=", 1); | |
300 | memcpy(i->data + strlen(key) + 1, value, strlen(value)); | |
301 | } | |
302 | i->length = length; | |
303 | ||
ae2a15bc | 304 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
305 | |
306 | return 0; | |
307 | } | |
308 | ||
309 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
310 | size_t length; | |
311 | DnsTxtItem *i; | |
312 | ||
313 | length = strlen(key); | |
314 | ||
315 | if (size > 0) | |
316 | length += size + 1; /* size of date plus '=' */ | |
317 | ||
318 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
319 | if (!i) | |
320 | return -ENOMEM; | |
321 | ||
322 | memcpy(i->data, key, strlen(key)); | |
323 | if (size > 0) { | |
324 | memcpy(i->data + strlen(key), "=", 1); | |
325 | memcpy(i->data + strlen(key) + 1, data, size); | |
326 | } | |
327 | i->length = length; | |
328 | ||
ae2a15bc | 329 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
330 | |
331 | return 0; | |
332 | } | |
c3036641 DR |
333 | |
334 | void dnssd_signal_conflict(Manager *manager, const char *name) { | |
335 | Iterator i; | |
336 | DnssdService *s; | |
337 | int r; | |
338 | ||
339 | HASHMAP_FOREACH(s, manager->dnssd_services, i) { | |
340 | if (s->withdrawn) | |
341 | continue; | |
342 | ||
343 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) { | |
344 | _cleanup_free_ char *path = NULL; | |
345 | ||
346 | s->withdrawn = true; | |
347 | ||
348 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path); | |
349 | if (r < 0) { | |
350 | log_error_errno(r, "Can't get D-BUS object path: %m"); | |
351 | return; | |
352 | } | |
353 | ||
354 | r = sd_bus_emit_signal(manager->bus, | |
355 | path, | |
356 | "org.freedesktop.resolve1.DnssdService", | |
357 | "Conflicted", | |
358 | NULL); | |
359 | if (r < 0) { | |
360 | log_error_errno(r, "Cannot emit signal: %m"); | |
361 | return; | |
362 | } | |
363 | ||
364 | break; | |
365 | } | |
366 | } | |
367 | } |