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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2014 Tom Gundersen <teg@jklm.no> | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <arpa/inet.h> | |
23 | #include <resolv.h> | |
24 | #include <linux/if.h> | |
25 | ||
26 | #include "resolved.h" | |
27 | #include "event-util.h" | |
28 | #include "network-util.h" | |
29 | #include "sd-dhcp-lease.h" | |
30 | #include "dhcp-lease-internal.h" | |
31 | #include "network-internal.h" | |
32 | #include "conf-parser.h" | |
091a364c TG |
33 | |
34 | static int set_fallback_dns(Manager *m, const char *string) { | |
35 | char *word, *state; | |
36 | size_t length; | |
37 | int r; | |
38 | ||
39 | assert(m); | |
40 | assert(string); | |
41 | ||
42 | FOREACH_WORD_QUOTED(word, length, string, state) { | |
43 | _cleanup_free_ Address *address = NULL; | |
44 | Address *tail; | |
45 | _cleanup_free_ char *addrstr = NULL; | |
46 | ||
47 | address = new0(Address, 1); | |
48 | if (!address) | |
49 | return -ENOMEM; | |
50 | ||
51 | addrstr = strndup(word, length); | |
52 | if (!addrstr) | |
53 | return -ENOMEM; | |
54 | ||
55 | r = net_parse_inaddr(addrstr, &address->family, &address->in_addr); | |
56 | if (r < 0) { | |
57 | log_debug("Ignoring invalid DNS address '%s'", addrstr); | |
58 | continue; | |
59 | } | |
60 | ||
61 | LIST_FIND_TAIL(addresses, m->fallback_dns, tail); | |
62 | LIST_INSERT_AFTER(addresses, m->fallback_dns, tail, address); | |
63 | address = NULL; | |
64 | } | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | int config_parse_dnsv( | |
70 | const char *unit, | |
71 | const char *filename, | |
72 | unsigned line, | |
73 | const char *section, | |
74 | unsigned section_line, | |
75 | const char *lvalue, | |
76 | int ltype, | |
77 | const char *rvalue, | |
78 | void *data, | |
79 | void *userdata) { | |
80 | ||
81 | Manager *m = userdata; | |
82 | Address *address; | |
83 | ||
84 | assert(filename); | |
85 | assert(lvalue); | |
86 | assert(rvalue); | |
87 | assert(m); | |
88 | ||
89 | while ((address = m->fallback_dns)) { | |
90 | LIST_REMOVE(addresses, m->fallback_dns, address); | |
91 | free(address); | |
92 | } | |
93 | ||
94 | set_fallback_dns(m, rvalue); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int manager_parse_config_file(Manager *m) { | |
100 | static const char fn[] = "/etc/systemd/resolved.conf"; | |
101 | _cleanup_fclose_ FILE *f = NULL; | |
102 | int r; | |
103 | ||
104 | assert(m); | |
105 | ||
106 | f = fopen(fn, "re"); | |
107 | if (!f) { | |
108 | if (errno == ENOENT) | |
109 | return 0; | |
110 | ||
111 | log_warning("Failed to open configuration file %s: %m", fn); | |
112 | return -errno; | |
113 | } | |
114 | ||
115 | r = config_parse(NULL, fn, f, "Resolve\0", config_item_perf_lookup, | |
116 | (void*) resolved_gperf_lookup, false, false, m); | |
117 | if (r < 0) | |
118 | log_warning("Failed to parse configuration file: %s", strerror(-r)); | |
119 | ||
120 | return r; | |
121 | } | |
122 | ||
123 | int manager_new(Manager **ret) { | |
124 | _cleanup_manager_free_ Manager *m = NULL; | |
125 | int r; | |
126 | ||
127 | m = new0(Manager, 1); | |
128 | if (!m) | |
129 | return -ENOMEM; | |
130 | ||
131 | r = set_fallback_dns(m, DNS_SERVERS); | |
132 | if (r < 0) | |
133 | return r; | |
134 | ||
135 | r = manager_parse_config_file(m); | |
136 | if (r < 0) | |
137 | return r; | |
138 | ||
139 | r = sd_event_default(&m->event); | |
140 | if (r < 0) | |
141 | return r; | |
142 | ||
143 | sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL); | |
144 | sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL); | |
145 | ||
146 | sd_event_set_watchdog(m->event, true); | |
147 | ||
148 | *ret = m; | |
149 | m = NULL; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | void manager_free(Manager *m) { | |
155 | Address *address; | |
156 | ||
157 | if (!m) | |
158 | return; | |
159 | ||
160 | sd_event_unref(m->event); | |
161 | ||
162 | while ((address = m->fallback_dns)) { | |
163 | LIST_REMOVE(addresses, m->fallback_dns, address); | |
164 | free(address); | |
165 | } | |
166 | ||
167 | free(m); | |
168 | } | |
169 | ||
170 | static void append_dns(FILE *f, void *dns, unsigned char family, unsigned *count) { | |
171 | char buf[INET6_ADDRSTRLEN]; | |
172 | const char *address; | |
173 | ||
174 | assert(f); | |
175 | assert(dns); | |
176 | assert(count); | |
177 | ||
178 | address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN); | |
179 | if (!address) { | |
180 | log_warning("Invalid DNS address. Ignoring."); | |
181 | return; | |
182 | } | |
183 | ||
184 | if (*count == MAXNS) | |
185 | fputs("# Too many DNS servers configured, the following entries " | |
186 | "may be ignored\n", f); | |
187 | ||
188 | fprintf(f, "nameserver %s\n", address); | |
189 | ||
190 | (*count) ++; | |
191 | } | |
192 | ||
193 | int manager_update_resolv_conf(Manager *m) { | |
b686acb2 | 194 | const char *path = "/run/systemd/resolve/resolv.conf"; |
091a364c TG |
195 | _cleanup_free_ char *temp_path = NULL; |
196 | _cleanup_fclose_ FILE *f = NULL; | |
197 | _cleanup_free_ unsigned *indices = NULL; | |
198 | Address *address; | |
199 | unsigned count = 0; | |
200 | int n, r, i; | |
201 | ||
202 | assert(m); | |
203 | ||
b686acb2 | 204 | r = fopen_temporary(path, &f, &temp_path); |
091a364c TG |
205 | if (r < 0) |
206 | return r; | |
207 | ||
208 | fchmod(fileno(f), 0644); | |
209 | ||
210 | fputs("# This file is managed by systemd-resolved(8). Do not edit.\n#\n" | |
211 | "# Third party programs must not access this file directly, but\n" | |
212 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
213 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
214 | "# static file or a different symlink.\n\n", f); | |
215 | ||
216 | n = sd_network_get_ifindices(&indices); | |
217 | if (n < 0) | |
218 | n = 0; | |
219 | ||
220 | for (i = 0; i < n; i++) { | |
221 | _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL; | |
222 | struct in_addr *nameservers; | |
223 | struct in6_addr *nameservers6; | |
224 | size_t nameservers_size; | |
225 | ||
226 | r = sd_network_dhcp_use_dns(indices[i]); | |
227 | if (r > 0) { | |
228 | r = sd_network_get_dhcp_lease(indices[i], &lease); | |
229 | if (r >= 0) { | |
230 | r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size); | |
231 | if (r >= 0) { | |
232 | unsigned j; | |
233 | ||
234 | for (j = 0; j < nameservers_size; j++) | |
235 | append_dns(f, &nameservers[j], AF_INET, &count); | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | r = sd_network_get_dns(indices[i], &nameservers, &nameservers_size); | |
241 | if (r >= 0) { | |
242 | unsigned j; | |
243 | ||
244 | for (j = 0; j < nameservers_size; j++) | |
245 | append_dns(f, &nameservers[j], AF_INET, &count); | |
246 | ||
247 | free(nameservers); | |
248 | } | |
249 | ||
250 | r = sd_network_get_dns6(indices[i], &nameservers6, &nameservers_size); | |
251 | if (r >= 0) { | |
252 | unsigned j; | |
253 | ||
254 | for (j = 0; j < nameservers_size; j++) | |
255 | append_dns(f, &nameservers6[j], AF_INET6, &count); | |
256 | ||
257 | free(nameservers6); | |
258 | } | |
259 | } | |
260 | ||
261 | LIST_FOREACH(addresses, address, m->fallback_dns) | |
262 | append_dns(f, &address->in_addr, address->family, &count); | |
263 | ||
264 | fflush(f); | |
265 | ||
b686acb2 | 266 | if (ferror(f) || rename(temp_path, path) < 0) { |
091a364c | 267 | r = -errno; |
b686acb2 | 268 | unlink(path); |
091a364c TG |
269 | unlink(temp_path); |
270 | return r; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int manager_network_event_handler(sd_event_source *s, int fd, uint32_t revents, | |
277 | void *userdata) { | |
278 | Manager *m = userdata; | |
279 | int r; | |
280 | ||
281 | assert(m); | |
282 | ||
283 | r = manager_update_resolv_conf(m); | |
284 | if (r < 0) | |
285 | log_warning("Could not update resolv.conf: %s", strerror(-r)); | |
286 | ||
287 | sd_network_monitor_flush(m->network_monitor); | |
288 | ||
289 | return 0; | |
290 | } | |
291 | ||
292 | int manager_network_monitor_listen(Manager *m) { | |
293 | _cleanup_event_source_unref_ sd_event_source *event_source = NULL; | |
294 | _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL; | |
295 | int r, fd, events; | |
296 | ||
297 | r = sd_network_monitor_new(NULL, &monitor); | |
298 | if (r < 0) | |
299 | return r; | |
300 | ||
301 | fd = sd_network_monitor_get_fd(monitor); | |
302 | if (fd < 0) | |
303 | return fd; | |
304 | ||
305 | events = sd_network_monitor_get_events(monitor); | |
306 | if (events < 0) | |
307 | return events; | |
308 | ||
309 | r = sd_event_add_io(m->event, &event_source, fd, events, | |
310 | &manager_network_event_handler, m); | |
311 | if (r < 0) | |
312 | return r; | |
313 | ||
314 | m->network_monitor = monitor; | |
315 | m->network_event_source = event_source; | |
316 | monitor = NULL; | |
317 | event_source = NULL; | |
318 | ||
319 | return 0; | |
320 | } |