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