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6501dd31 DR |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2017 Dmitry Rozhkov | |
6501dd31 DR |
5 | ***/ |
6 | ||
7 | #include "conf-files.h" | |
8 | #include "conf-parser.h" | |
9 | #include "resolved-dnssd.h" | |
10 | #include "resolved-dns-rr.h" | |
11 | #include "resolved-manager.h" | |
12 | #include "specifier.h" | |
13 | #include "strv.h" | |
14 | ||
15 | const char* const dnssd_service_dirs[] = { | |
16 | "/etc/systemd/dnssd", | |
17 | "/run/systemd/dnssd", | |
18 | "/usr/lib/systemd/dnssd", | |
19 | #ifdef HAVE_SPLIT_USR | |
20 | "/lib/systemd/dnssd", | |
21 | #endif | |
22 | NULL | |
23 | }; | |
24 | ||
400f54fb DR |
25 | DnssdTxtData *dnssd_txtdata_free(DnssdTxtData *txt_data) { |
26 | if (!txt_data) | |
27 | return NULL; | |
28 | ||
29 | dns_resource_record_unref(txt_data->rr); | |
30 | dns_txt_item_free_all(txt_data->txt); | |
31 | ||
32 | return mfree(txt_data); | |
33 | } | |
34 | ||
35 | DnssdTxtData *dnssd_txtdata_free_all(DnssdTxtData *txt_data) { | |
36 | DnssdTxtData *next; | |
37 | ||
38 | if (!txt_data) | |
39 | return NULL; | |
40 | ||
41 | next = txt_data->items_next; | |
42 | ||
43 | dnssd_txtdata_free(txt_data); | |
44 | ||
45 | return dnssd_txtdata_free_all(next); | |
46 | } | |
47 | ||
6501dd31 DR |
48 | DnssdService *dnssd_service_free(DnssdService *service) { |
49 | if (!service) | |
50 | return NULL; | |
51 | ||
52 | if (service->manager) | |
53 | hashmap_remove(service->manager->dnssd_services, service->name); | |
54 | ||
55 | dns_resource_record_unref(service->ptr_rr); | |
56 | dns_resource_record_unref(service->srv_rr); | |
400f54fb DR |
57 | |
58 | dnssd_txtdata_free_all(service->txt_data_items); | |
6501dd31 DR |
59 | |
60 | free(service->filename); | |
61 | free(service->name); | |
62 | free(service->type); | |
63 | free(service->name_template); | |
6501dd31 DR |
64 | |
65 | return mfree(service); | |
66 | } | |
67 | ||
68 | static int dnssd_service_load(Manager *manager, const char *filename) { | |
69 | _cleanup_(dnssd_service_freep) DnssdService *service = NULL; | |
400f54fb | 70 | _cleanup_(dnssd_txtdata_freep) DnssdTxtData *txt_data = NULL; |
6501dd31 DR |
71 | char *d; |
72 | const char *dropin_dirname; | |
73 | int r; | |
74 | ||
75 | assert(manager); | |
76 | assert(filename); | |
77 | ||
78 | service = new0(DnssdService, 1); | |
79 | if (!service) | |
80 | return log_oom(); | |
81 | ||
82 | service->filename = strdup(filename); | |
83 | if (!service->filename) | |
84 | return log_oom(); | |
85 | ||
86 | service->name = strdup(basename(filename)); | |
87 | if (!service->name) | |
88 | return log_oom(); | |
89 | ||
90 | d = endswith(service->name, ".dnssd"); | |
91 | if (!d) | |
92 | return -EINVAL; | |
93 | ||
94 | assert(streq(d, ".dnssd")); | |
95 | ||
96 | *d = '\0'; | |
97 | ||
98 | dropin_dirname = strjoina(service->name, ".dnssd.d"); | |
99 | ||
100 | r = config_parse_many(filename, dnssd_service_dirs, dropin_dirname, | |
101 | "Service\0", | |
102 | config_item_perf_lookup, resolved_dnssd_gperf_lookup, | |
103 | false, service); | |
104 | if (r < 0) | |
105 | return r; | |
106 | ||
107 | if (!service->name_template) { | |
108 | log_error("%s doesn't define service instance name", service->name); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | if (!service->type) { | |
113 | log_error("%s doesn't define service type", service->name); | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
400f54fb DR |
117 | if (LIST_IS_EMPTY(service->txt_data_items)) { |
118 | txt_data = new0(DnssdTxtData, 1); | |
119 | if (!txt_data) | |
120 | return log_oom(); | |
121 | ||
122 | r = dns_txt_item_new_empty(&txt_data->txt); | |
6501dd31 DR |
123 | if (r < 0) |
124 | return r; | |
400f54fb DR |
125 | |
126 | LIST_PREPEND(items, service->txt_data_items, txt_data); | |
127 | txt_data = NULL; | |
6501dd31 DR |
128 | } |
129 | ||
130 | r = hashmap_ensure_allocated(&manager->dnssd_services, &string_hash_ops); | |
131 | if (r < 0) | |
132 | return r; | |
133 | ||
134 | r = hashmap_put(manager->dnssd_services, service->name, service); | |
135 | if (r < 0) | |
136 | return r; | |
137 | ||
138 | service->manager = manager; | |
139 | ||
6db6a464 DR |
140 | r = dnssd_update_rrs(service); |
141 | if (r < 0) | |
142 | return r; | |
143 | ||
6501dd31 DR |
144 | service = NULL; |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int specifier_dnssd_host_name(char specifier, void *data, void *userdata, char **ret) { | |
150 | DnssdService *s = (DnssdService *) userdata; | |
151 | char *n; | |
152 | ||
153 | assert(s); | |
154 | assert(s->manager); | |
155 | assert(s->manager->llmnr_hostname); | |
156 | ||
157 | n = strdup(s->manager->llmnr_hostname); | |
158 | if (!n) | |
159 | return -ENOMEM; | |
160 | ||
161 | *ret = n; | |
162 | return 0; | |
163 | } | |
164 | ||
165 | int dnssd_render_instance_name(DnssdService *s, char **ret_name) { | |
166 | static const Specifier specifier_table[] = { | |
167 | { 'b', specifier_boot_id, NULL }, | |
168 | { 'H', specifier_dnssd_host_name, NULL }, | |
169 | { 'm', specifier_machine_id, NULL }, | |
170 | { 'v', specifier_kernel_release, NULL }, | |
171 | {} | |
172 | }; | |
173 | _cleanup_free_ char *name = NULL; | |
174 | int r; | |
175 | ||
176 | assert(s); | |
177 | assert(s->name_template); | |
178 | ||
179 | r = specifier_printf(s->name_template, specifier_table, s, &name); | |
180 | if (r < 0) | |
181 | return log_debug_errno(r, "Failed to replace specifiers: %m"); | |
182 | ||
183 | if (!dns_service_name_is_valid(name)) { | |
184 | log_debug("Service instance name '%s' is invalid.", name); | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
ae2a15bc | 188 | *ret_name = TAKE_PTR(name); |
6501dd31 DR |
189 | |
190 | return 0; | |
191 | } | |
192 | ||
193 | int dnssd_load(Manager *manager) { | |
194 | _cleanup_strv_free_ char **files = NULL; | |
195 | char **f; | |
196 | int r; | |
197 | ||
198 | assert(manager); | |
199 | ||
200 | if (manager->mdns_support != RESOLVE_SUPPORT_YES) | |
201 | return 0; | |
202 | ||
203 | r = conf_files_list_strv(&files, ".dnssd", NULL, 0, dnssd_service_dirs); | |
204 | if (r < 0) | |
205 | return log_error_errno(r, "Failed to enumerate .dnssd files: %m"); | |
206 | ||
207 | STRV_FOREACH_BACKWARDS(f, files) { | |
208 | r = dnssd_service_load(manager, *f); | |
209 | if (r < 0) | |
210 | log_warning_errno(r, "Failed to load '%s': %m", *f);; | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
6db6a464 DR |
216 | int dnssd_update_rrs(DnssdService *s) { |
217 | _cleanup_free_ char *n = NULL; | |
218 | _cleanup_free_ char *service_name = NULL; | |
219 | _cleanup_free_ char *full_name = NULL; | |
400f54fb | 220 | DnssdTxtData *txt_data; |
6db6a464 DR |
221 | int r; |
222 | ||
223 | assert(s); | |
400f54fb | 224 | assert(s->txt_data_items); |
6db6a464 DR |
225 | assert(s->manager); |
226 | ||
227 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); | |
228 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
400f54fb DR |
229 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
230 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
231 | |
232 | r = dnssd_render_instance_name(s, &n); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
236 | r = dns_name_concat(s->type, "local", &service_name); | |
237 | if (r < 0) | |
238 | return r; | |
239 | r = dns_name_concat(n, service_name, &full_name); | |
240 | if (r < 0) | |
241 | return r; | |
242 | ||
400f54fb DR |
243 | LIST_FOREACH(items, txt_data, s->txt_data_items) { |
244 | txt_data->rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_TXT, | |
245 | full_name); | |
246 | if (!txt_data->rr) | |
247 | goto oom; | |
6db6a464 | 248 | |
400f54fb DR |
249 | txt_data->rr->ttl = MDNS_DEFAULT_TTL; |
250 | txt_data->rr->txt.items = dns_txt_item_copy(txt_data->txt); | |
251 | if (!txt_data->rr->txt.items) | |
252 | goto oom; | |
253 | } | |
6db6a464 DR |
254 | |
255 | s->ptr_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_PTR, | |
256 | service_name); | |
257 | if (!s->ptr_rr) | |
258 | goto oom; | |
259 | ||
260 | s->ptr_rr->ttl = MDNS_DEFAULT_TTL; | |
261 | s->ptr_rr->ptr.name = strdup(full_name); | |
262 | if (!s->ptr_rr->ptr.name) | |
263 | goto oom; | |
264 | ||
265 | s->srv_rr = dns_resource_record_new_full(DNS_CLASS_IN, DNS_TYPE_SRV, | |
266 | full_name); | |
267 | if (!s->srv_rr) | |
268 | goto oom; | |
269 | ||
270 | s->srv_rr->ttl = MDNS_DEFAULT_TTL; | |
271 | s->srv_rr->srv.priority = s->priority; | |
272 | s->srv_rr->srv.weight = s->weight; | |
273 | s->srv_rr->srv.port = s->port; | |
274 | s->srv_rr->srv.name = strdup(s->manager->mdns_hostname); | |
275 | if (!s->srv_rr->srv.name) | |
276 | goto oom; | |
277 | ||
278 | return 0; | |
279 | ||
280 | oom: | |
400f54fb DR |
281 | LIST_FOREACH(items, txt_data, s->txt_data_items) |
282 | txt_data->rr = dns_resource_record_unref(txt_data->rr); | |
6db6a464 DR |
283 | s->ptr_rr = dns_resource_record_unref(s->ptr_rr); |
284 | s->srv_rr = dns_resource_record_unref(s->srv_rr); | |
285 | return -ENOMEM; | |
286 | } | |
287 | ||
6501dd31 DR |
288 | int dnssd_txt_item_new_from_string(const char *key, const char *value, DnsTxtItem **ret_item) { |
289 | size_t length; | |
290 | DnsTxtItem *i; | |
291 | ||
292 | length = strlen(key); | |
293 | ||
294 | if (!isempty(value)) | |
295 | length += strlen(value) + 1; /* length of value plus '=' */ | |
296 | ||
297 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
298 | if (!i) | |
299 | return -ENOMEM; | |
300 | ||
301 | memcpy(i->data, key, strlen(key)); | |
302 | if (!isempty(value)) { | |
303 | memcpy(i->data + strlen(key), "=", 1); | |
304 | memcpy(i->data + strlen(key) + 1, value, strlen(value)); | |
305 | } | |
306 | i->length = length; | |
307 | ||
ae2a15bc | 308 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
309 | |
310 | return 0; | |
311 | } | |
312 | ||
313 | int dnssd_txt_item_new_from_data(const char *key, const void *data, const size_t size, DnsTxtItem **ret_item) { | |
314 | size_t length; | |
315 | DnsTxtItem *i; | |
316 | ||
317 | length = strlen(key); | |
318 | ||
319 | if (size > 0) | |
320 | length += size + 1; /* size of date plus '=' */ | |
321 | ||
322 | i = malloc0(offsetof(DnsTxtItem, data) + length + 1); /* for safety reasons we add an extra NUL byte */ | |
323 | if (!i) | |
324 | return -ENOMEM; | |
325 | ||
326 | memcpy(i->data, key, strlen(key)); | |
327 | if (size > 0) { | |
328 | memcpy(i->data + strlen(key), "=", 1); | |
329 | memcpy(i->data + strlen(key) + 1, data, size); | |
330 | } | |
331 | i->length = length; | |
332 | ||
ae2a15bc | 333 | *ret_item = TAKE_PTR(i); |
6501dd31 DR |
334 | |
335 | return 0; | |
336 | } | |
c3036641 DR |
337 | |
338 | void dnssd_signal_conflict(Manager *manager, const char *name) { | |
339 | Iterator i; | |
340 | DnssdService *s; | |
341 | int r; | |
342 | ||
343 | HASHMAP_FOREACH(s, manager->dnssd_services, i) { | |
344 | if (s->withdrawn) | |
345 | continue; | |
346 | ||
347 | if (dns_name_equal(dns_resource_key_name(s->srv_rr->key), name)) { | |
348 | _cleanup_free_ char *path = NULL; | |
349 | ||
350 | s->withdrawn = true; | |
351 | ||
352 | r = sd_bus_path_encode("/org/freedesktop/resolve1/dnssd", s->name, &path); | |
353 | if (r < 0) { | |
354 | log_error_errno(r, "Can't get D-BUS object path: %m"); | |
355 | return; | |
356 | } | |
357 | ||
358 | r = sd_bus_emit_signal(manager->bus, | |
359 | path, | |
360 | "org.freedesktop.resolve1.DnssdService", | |
361 | "Conflicted", | |
362 | NULL); | |
363 | if (r < 0) { | |
364 | log_error_errno(r, "Cannot emit signal: %m"); | |
365 | return; | |
366 | } | |
367 | ||
368 | break; | |
369 | } | |
370 | } | |
371 | } |