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6501dd31 | 1 | /*** |
96b2fb93 | 2 | Copyright © 2017 Dmitry Rozhkov |
6501dd31 DR |
3 | ***/ |
4 | ||
5 | #include "conf-files.h" | |
6 | #include "conf-parser.h" | |
7 | #include "resolved-dnssd.h" | |
8 | #include "resolved-dns-rr.h" | |
9 | #include "resolved-manager.h" | |
10 | #include "specifier.h" | |
11 | #include "strv.h" | |
12 | ||
13 | const char* const dnssd_service_dirs[] = { | |
14 | "/etc/systemd/dnssd", | |
15 | "/run/systemd/dnssd", | |
16 | "/usr/lib/systemd/dnssd", | |
17 | #ifdef HAVE_SPLIT_USR | |
18 | "/lib/systemd/dnssd", | |
19 | #endif | |
20 | NULL | |
21 | }; | |
22 | ||
400f54fb DR |
23 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
24 | if (!txt_data) | |
25 | return NULL; | |
26 | ||
27 | dns_resource_record_unref(txt_data->rr); | |
28 | dns_txt_item_free_all(txt_data->txt); | |
29 | ||
30 | return mfree(txt_data); | |
31 | } | |
32 | ||
33 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
34 | DnssdTxtData *next; | |
35 | ||
36 | if (!txt_data) | |
37 | return NULL; | |
38 | ||
39 | next = txt_data->items_next; | |
40 | ||
41 | dnssd_txtdata_free(txt_data); | |
42 | ||
43 | return dnssd_txtdata_free_all(next); | |
44 | } | |
45 | ||
6501dd31 DR |
46 | DnssdService *dnssd_service_free(DnssdService *service) { |
47 | if (!service) | |
48 | return NULL; | |
49 | ||
50 | if (service->manager) | |
51 | hashmap_remove(service->manager->dnssd_services, service->name); | |
52 | ||
53 | dns_resource_record_unref(service->ptr_rr); | |
54 | dns_resource_record_unref(service->srv_rr); | |
400f54fb DR |
55 | |
56 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 DR |
57 | |
58 | free(service->filename); | |
59 | free(service->name); | |
60 | free(service->type); | |
61 | free(service->name_template); | |
6501dd31 DR |
62 | |
63 | return mfree(service); | |
64 | } | |
65 | ||
66 | static int dnssd_service_load(Manager *manager, const char *filename) { | |
67 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; | |
400f54fb | 68 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
6501dd31 DR |
69 | char *d; |
70 | const char *dropin_dirname; | |
71 | int r; | |
72 | ||
73 | assert(manager); | |
74 | assert(filename); | |
75 | ||
76 | service = new0(DnssdService, 1); | |
77 | if (!service) | |
78 | return log_oom(); | |
79 | ||
80 | service->filename = strdup(filename); | |
81 | if (!service->filename) | |
82 | return log_oom(); | |
83 | ||
84 | service->name = strdup(basename(filename)); | |
85 | if (!service->name) | |
86 | return log_oom(); | |
87 | ||
88 | d = endswith(service->name, ".dnssd"); | |
89 | if (!d) | |
90 | return -EINVAL; | |
91 | ||
92 | assert(streq(d, ".dnssd")); | |
93 | ||
94 | *d = '\0'; | |
95 | ||
96 | dropin_dirname = strjoina(service->name, ".dnssd.d"); | |
97 | ||
98 | r = config_parse_many(filename, dnssd_service_dirs, dropin_dirname, | |
99 | "Service\0", | |
100 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
101 | false, service); | |
102 | if (r < 0) | |
103 | return r; | |
104 | ||
105 | if (!service->name_template) { | |
106 | log_error("%s doesn't define service instance name", service->name); | |
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | if (!service->type) { | |
111 | log_error("%s doesn't define service type", service->name); | |
112 | return -EINVAL; | |
113 | } | |
114 | ||
400f54fb DR |
115 | if (LIST_IS_EMPTY(service->txt_data_items)) { |
116 | txt_data = new0(DnssdTxtData, 1); | |
117 | if (!txt_data) | |
118 | return log_oom(); | |
119 | ||
120 | r = dns_txt_item_new_empty(&txt_data->txt); | |
6501dd31 DR |
121 | if (r < 0) |
122 | return r; | |
400f54fb DR |
123 | |
124 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
125 | txt_data = NULL; | |
6501dd31 DR |
126 | } |
127 | ||
128 | r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops); | |
129 | if (r < 0) | |
130 | return r; | |
131 | ||
132 | r = hashmap_put(manager->dnssd_services, service->name, service); | |
133 | if (r < 0) | |
134 | return r; | |
135 | ||
136 | service->manager = manager; | |
137 | ||
6db6a464 DR |
138 | r = dnssd_update_rrs(service); |
139 | if (r < 0) | |
140 | return r; | |
141 | ||
6501dd31 DR |
142 | service = NULL; |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int specifier_dnssd_host_name(char specifier, void *data, void *userdata, char **ret) { | |
148 | DnssdService *s = (DnssdService *) userdata; | |
149 | char *n; | |
150 | ||
151 | assert(s); | |
152 | assert(s->manager); | |
153 | assert(s->manager->llmnr_hostname); | |
154 | ||
155 | n = strdup(s->manager->llmnr_hostname); | |
156 | if (!n) | |
157 | return -ENOMEM; | |
158 | ||
159 | *ret = n; | |
160 | return 0; | |
161 | } | |
162 | ||
163 | int dnssd_render_instance_name(DnssdService *s, char **ret_name) { | |
164 | static const Specifier specifier_table[] = { | |
165 | { 'b', specifier_boot_id, NULL }, | |
166 | { 'H', specifier_dnssd_host_name, NULL }, | |
24eb8621 | 167 | { 'm', specifier_machine_id, NULL }, |
6501dd31 DR |
168 | { 'v', specifier_kernel_release, NULL }, |
169 | {} | |
170 | }; | |
171 | _cleanup_free_ char *name = NULL; | |
172 | int r; | |
173 | ||
174 | assert(s); | |
175 | assert(s->name_template); | |
176 | ||
177 | r = specifier_printf(s->name_template, specifier_table, s, &name); | |
178 | if (r < 0) | |
179 | return log_debug_errno(r, "Failed to replace specifiers: %m"); | |
180 | ||
181 | if (!dns_service_name_is_valid(name)) { | |
182 | log_debug("Service instance name '%s' is invalid.", name); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
ae2a15bc | 186 | *ret_name = TAKE_PTR(name); |
6501dd31 DR |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
191 | int dnssd_load(Manager *manager) { | |
192 | _cleanup_strv_free_ char **files = NULL; | |
193 | char **f; | |
194 | int r; | |
195 | ||
196 | assert(manager); | |
197 | ||
198 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
199 | return 0; | |
200 | ||
201 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, dnssd_service_dirs); | |
202 | if (r < 0) | |
203 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
204 | ||
205 | STRV_FOREACH_BACKWARDS(f, files) { | |
206 | r = dnssd_service_load(manager, *f); | |
207 | if (r < 0) | |
208 | log_warning_errno(r, "Failed to load '%s': %m", *f);; | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
6db6a464 DR |
214 | int dnssd_update_rrs(DnssdService *s) { |
215 | _cleanup_free_ char *n = NULL; | |
216 | _cleanup_free_ char *service_name = NULL; | |
217 | _cleanup_free_ char *full_name = NULL; | |
400f54fb | 218 | DnssdTxtData *txt_data; |
6db6a464 DR |
219 | int r; |
220 | ||
221 | assert(s); | |
400f54fb | 222 | assert(s->txt_data_items); |
6db6a464 DR |
223 | assert(s->manager); |
224 | ||
225 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
226 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
400f54fb DR |
227 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
228 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
229 | |
230 | r = dnssd_render_instance_name(s, &n); | |
231 | if (r < 0) | |
232 | return r; | |
233 | ||
234 | r = dns_name_concat(s->type, "local", &service_name); | |
235 | if (r < 0) | |
236 | return r; | |
237 | r = dns_name_concat(n, service_name, &full_name); | |
238 | if (r < 0) | |
239 | return r; | |
240 | ||
400f54fb DR |
241 | LIST_FOREACH(items, txt_data, s->txt_data_items) { |
242 | txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT, | |
243 | full_name); | |
244 | if (!txt_data->rr) | |
245 | goto oom; | |
6db6a464 | 246 | |
400f54fb DR |
247 | txt_data->rr->ttl = MDNS_DEFAULT_TTL; |
248 | txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt); | |
249 | if (!txt_data->rr->txt.items) | |
250 | goto oom; | |
251 | } | |
6db6a464 DR |
252 | |
253 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
254 | service_name); | |
255 | if (!s->ptr_rr) | |
256 | goto oom; | |
257 | ||
258 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
259 | s->ptr_rr->ptr.name = strdup(full_name); | |
260 | if (!s->ptr_rr->ptr.name) | |
261 | goto oom; | |
262 | ||
263 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, | |
264 | full_name); | |
265 | if (!s->srv_rr) | |
266 | goto oom; | |
267 | ||
268 | s->srv_rr->ttl = MDNS_DEFAULT_TTL; | |
269 | s->srv_rr->srv.priority = s->priority; | |
270 | s->srv_rr->srv.weight = s->weight; | |
271 | s->srv_rr->srv.port = s->port; | |
272 | s->srv_rr->srv.name = strdup(s->manager->mdns_hostname); | |
273 | if (!s->srv_rr->srv.name) | |
274 | goto oom; | |
275 | ||
276 | return 0; | |
277 | ||
278 | oom: | |
400f54fb DR |
279 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
280 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
281 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
282 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
283 | return -ENOMEM; | |
284 | } | |
285 | ||
6501dd31 DR |
286 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
287 | size_t length; | |
288 | DnsTxtItem *i; | |
289 | ||
290 | length = strlen(key); | |
291 | ||
292 | if (!isempty(value)) | |
293 | length += strlen(value) + 1; /* length of value plus '=' */ | |
294 | ||
295 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
296 | if (!i) | |
297 | return -ENOMEM; | |
298 | ||
299 | memcpy(i->data, key, strlen(key)); | |
300 | if (!isempty(value)) { | |
301 | memcpy(i->data + strlen(key), "=", 1); | |
302 | memcpy(i->data + strlen(key) + 1, value, strlen(value)); | |
303 | } | |
304 | i->length = length; | |
305 | ||
ae2a15bc | 306 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
307 | |
308 | return 0; | |
309 | } | |
310 | ||
311 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
312 | size_t length; | |
313 | DnsTxtItem *i; | |
314 | ||
315 | length = strlen(key); | |
316 | ||
317 | if (size > 0) | |
318 | length += size + 1; /* size of date plus '=' */ | |
319 | ||
320 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
321 | if (!i) | |
322 | return -ENOMEM; | |
323 | ||
324 | memcpy(i->data, key, strlen(key)); | |
325 | if (size > 0) { | |
326 | memcpy(i->data + strlen(key), "=", 1); | |
327 | memcpy(i->data + strlen(key) + 1, data, size); | |
328 | } | |
329 | i->length = length; | |
330 | ||
ae2a15bc | 331 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
332 | |
333 | return 0; | |
334 | } | |
c3036641 DR |
335 | |
336 | void dnssd_signal_conflict(Manager *manager, const char *name) { | |
337 | Iterator i; | |
338 | DnssdService *s; | |
339 | int r; | |
340 | ||
341 | HASHMAP_FOREACH(s, manager->dnssd_services, i) { | |
342 | if (s->withdrawn) | |
343 | continue; | |
344 | ||
345 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) { | |
346 | _cleanup_free_ char *path = NULL; | |
347 | ||
348 | s->withdrawn = true; | |
349 | ||
350 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path); | |
351 | if (r < 0) { | |
352 | log_error_errno(r, "Can't get D-BUS object path: %m"); | |
353 | return; | |
354 | } | |
355 | ||
356 | r = sd_bus_emit_signal(manager->bus, | |
357 | path, | |
358 | "org.freedesktop.resolve1.DnssdService", | |
359 | "Conflicted", | |
360 | NULL); | |
361 | if (r < 0) { | |
362 | log_error_errno(r, "Cannot emit signal: %m"); | |
363 | return; | |
364 | } | |
365 | ||
366 | break; | |
367 | } | |
368 | } | |
369 | } |