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f579559b TG |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 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 | ||
3bef724f TG |
22 | #include <resolv.h> |
23 | ||
f579559b TG |
24 | #include "path-util.h" |
25 | #include "networkd.h" | |
26 | #include "libudev-private.h" | |
7b77ed8c | 27 | #include "udev-util.h" |
50add290 | 28 | #include "rtnl-util.h" |
3bef724f | 29 | #include "mkdir.h" |
60ad0c85 | 30 | #include "virt.h" |
f579559b | 31 | |
505f8da7 TG |
32 | #include "sd-rtnl.h" |
33 | ||
2ad8416d ZJS |
34 | const char* const network_dirs[] = { |
35 | "/etc/systemd/network", | |
36 | "/run/systemd/network", | |
37 | "/usr/lib/systemd/network", | |
eed0eee8 | 38 | #ifdef HAVE_SPLIT_USR |
2ad8416d ZJS |
39 | "/lib/systemd/network", |
40 | #endif | |
41 | NULL}; | |
42 | ||
0c2f9b84 TG |
43 | static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) { |
44 | Manager *m = userdata; | |
45 | ||
46 | assert(m); | |
47 | ||
48 | log_received_signal(LOG_INFO, si); | |
49 | ||
50 | sd_event_exit(m->event, 0); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | static int setup_signals(Manager *m) { | |
55 | sigset_t mask; | |
56 | int r; | |
57 | ||
58 | assert(m); | |
59 | ||
60 | assert_se(sigemptyset(&mask) == 0); | |
61 | sigset_add_many(&mask, SIGINT, SIGTERM, -1); | |
62 | assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0); | |
63 | ||
64 | r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m); | |
65 | if (r < 0) | |
66 | return r; | |
67 | ||
68 | r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m); | |
69 | if (r < 0) | |
70 | return r; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
f579559b TG |
75 | int manager_new(Manager **ret) { |
76 | _cleanup_manager_free_ Manager *m = NULL; | |
77 | int r; | |
78 | ||
79 | m = new0(Manager, 1); | |
80 | if (!m) | |
81 | return -ENOMEM; | |
82 | ||
afc6adb5 | 83 | r = sd_event_default(&m->event); |
f579559b TG |
84 | if (r < 0) |
85 | return r; | |
86 | ||
cde93897 LP |
87 | sd_event_set_watchdog(m->event, true); |
88 | ||
151b9b96 | 89 | r = sd_rtnl_open(&m->rtnl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR); |
f579559b TG |
90 | if (r < 0) |
91 | return r; | |
92 | ||
1346b1f0 | 93 | r = sd_bus_default_system(&m->bus); |
bcbca829 | 94 | if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */ |
1346b1f0 TG |
95 | return r; |
96 | ||
0c2f9b84 TG |
97 | r = setup_signals(m); |
98 | if (r < 0) | |
99 | return r; | |
100 | ||
60ad0c85 TG |
101 | /* udev does not initialize devices inside containers, |
102 | * so we rely on them being already initialized before | |
103 | * entering the container */ | |
505f8da7 TG |
104 | if (detect_container(NULL) <= 0) { |
105 | m->udev = udev_new(); | |
106 | if (!m->udev) | |
60ad0c85 | 107 | return -ENOMEM; |
505f8da7 | 108 | |
60ad0c85 TG |
109 | m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"); |
110 | if (!m->udev_monitor) | |
111 | return -ENOMEM; | |
112 | } | |
f579559b TG |
113 | |
114 | m->links = hashmap_new(uint64_hash_func, uint64_compare_func); | |
115 | if (!m->links) | |
116 | return -ENOMEM; | |
117 | ||
52433f6b TG |
118 | m->netdevs = hashmap_new(string_hash_func, string_compare_func); |
119 | if (!m->netdevs) | |
02b59d57 TG |
120 | return -ENOMEM; |
121 | ||
f579559b TG |
122 | LIST_HEAD_INIT(m->networks); |
123 | ||
f579559b TG |
124 | *ret = m; |
125 | m = NULL; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | void manager_free(Manager *m) { | |
0617ffab | 131 | Network *network; |
1a436809 | 132 | NetDev *netdev; |
0617ffab TG |
133 | Link *link; |
134 | ||
624b5a63 TG |
135 | if (!m) |
136 | return; | |
137 | ||
f579559b TG |
138 | udev_monitor_unref(m->udev_monitor); |
139 | udev_unref(m->udev); | |
1346b1f0 | 140 | sd_bus_unref(m->bus); |
f579559b | 141 | sd_event_source_unref(m->udev_event_source); |
0c2f9b84 TG |
142 | sd_event_source_unref(m->sigterm_event_source); |
143 | sd_event_source_unref(m->sigint_event_source); | |
f579559b | 144 | sd_event_unref(m->event); |
0617ffab | 145 | |
0617ffab TG |
146 | while ((link = hashmap_first(m->links))) |
147 | link_free(link); | |
f579559b | 148 | hashmap_free(m->links); |
0617ffab | 149 | |
2292547a TG |
150 | while ((network = m->networks)) |
151 | network_free(network); | |
152 | ||
52433f6b TG |
153 | while ((netdev = hashmap_first(m->netdevs))) |
154 | netdev_free(netdev); | |
155 | hashmap_free(m->netdevs); | |
02b59d57 | 156 | |
f579559b TG |
157 | sd_rtnl_unref(m->rtnl); |
158 | ||
159 | free(m); | |
160 | } | |
161 | ||
02b59d57 TG |
162 | int manager_load_config(Manager *m) { |
163 | int r; | |
164 | ||
165 | /* update timestamp */ | |
2ad8416d | 166 | paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true); |
02b59d57 | 167 | |
52433f6b | 168 | r = netdev_load(m); |
02b59d57 TG |
169 | if (r < 0) |
170 | return r; | |
171 | ||
172 | r = network_load(m); | |
173 | if (r < 0) | |
174 | return r; | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | bool manager_should_reload(Manager *m) { | |
2ad8416d | 180 | return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false); |
02b59d57 TG |
181 | } |
182 | ||
505f8da7 | 183 | static int manager_udev_process_link(Manager *m, struct udev_device *device) { |
11a7f229 | 184 | Link *link = NULL; |
667fcc6d | 185 | int r, ifindex; |
f579559b | 186 | |
11a7f229 TG |
187 | assert(m); |
188 | assert(device); | |
f579559b | 189 | |
505f8da7 TG |
190 | if (!streq_ptr(udev_device_get_action(device), "add")) |
191 | return 0; | |
192 | ||
667fcc6d TG |
193 | ifindex = udev_device_get_ifindex(device); |
194 | if (ifindex <= 0) { | |
195 | log_debug("ignoring udev ADD event for device with invalid ifindex"); | |
196 | return 0; | |
197 | } | |
505f8da7 | 198 | |
667fcc6d TG |
199 | r = link_get(m, ifindex, &link); |
200 | if (r == -ENODEV) | |
505f8da7 | 201 | return 0; |
667fcc6d TG |
202 | else if (r < 0) |
203 | return r; | |
505f8da7 TG |
204 | |
205 | r = link_initialized(link, device); | |
206 | if (r < 0) | |
207 | return r; | |
11a7f229 | 208 | |
505f8da7 TG |
209 | return 0; |
210 | } | |
f579559b | 211 | |
505f8da7 TG |
212 | static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) { |
213 | Manager *m = userdata; | |
214 | Link *link = NULL; | |
215 | char *name; | |
216 | int r, ifindex; | |
f579559b | 217 | |
505f8da7 TG |
218 | assert(rtnl); |
219 | assert(message); | |
f579559b TG |
220 | assert(m); |
221 | ||
505f8da7 TG |
222 | r = sd_rtnl_message_link_get_ifindex(message, &ifindex); |
223 | if (r < 0 || ifindex <= 0) { | |
224 | log_warning("rtnl: received link message without valid ifindex"); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | link_get(m, ifindex, &link); | |
229 | if (!link) { | |
230 | /* link is new, so add it */ | |
231 | r = link_add(m, message, &link); | |
232 | if (r < 0) { | |
233 | log_debug("could not add new link"); | |
234 | return 0; | |
235 | } | |
236 | } | |
f579559b | 237 | |
505f8da7 | 238 | r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name); |
f579559b | 239 | if (r < 0) |
505f8da7 TG |
240 | log_warning("rtnl: received link message without valid ifname"); |
241 | else { | |
242 | NetDev *netdev; | |
f579559b | 243 | |
505f8da7 TG |
244 | r = netdev_get(m, name, &netdev); |
245 | if (r >= 0) { | |
246 | r = netdev_set_ifindex(netdev, message); | |
247 | if (r < 0) { | |
248 | log_debug("could not set ifindex on netdev"); | |
249 | return 0; | |
250 | } | |
251 | } | |
60ad0c85 | 252 | } |
e1202047 | 253 | |
505f8da7 TG |
254 | r = link_update(link, message); |
255 | if (r < 0) | |
256 | return 0; | |
257 | ||
258 | return 1; | |
259 | } | |
260 | ||
261 | int manager_rtnl_enumerate_links(Manager *m) { | |
262 | _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL; | |
263 | sd_rtnl_message *link; | |
264 | int r, k; | |
265 | ||
266 | assert(m); | |
267 | assert(m->rtnl); | |
268 | ||
269 | r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0); | |
270 | if (r < 0) | |
271 | return r; | |
272 | ||
273 | r = sd_rtnl_message_request_dump(req, true); | |
f579559b | 274 | if (r < 0) |
bf5332d2 | 275 | return r; |
f579559b | 276 | |
505f8da7 TG |
277 | r = sd_rtnl_call(m->rtnl, req, 0, &reply); |
278 | if (r < 0) | |
279 | return r; | |
f579559b | 280 | |
505f8da7 TG |
281 | for (link = reply; link; link = sd_rtnl_message_next(link)) { |
282 | uint16_t type; | |
283 | ||
284 | k = sd_rtnl_message_get_type(link, &type); | |
285 | if (k < 0) | |
286 | return k; | |
287 | ||
288 | if (type != RTM_NEWLINK) | |
289 | continue; | |
f579559b | 290 | |
505f8da7 | 291 | k = manager_rtnl_process_link(m->rtnl, link, m); |
f579559b TG |
292 | if (k < 0) |
293 | r = k; | |
294 | } | |
295 | ||
f579559b TG |
296 | return r; |
297 | } | |
298 | ||
299 | static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) { | |
300 | Manager *m = userdata; | |
301 | struct udev_monitor *monitor = m->udev_monitor; | |
7b77ed8c | 302 | _cleanup_udev_device_unref_ struct udev_device *device = NULL; |
f579559b TG |
303 | |
304 | device = udev_monitor_receive_device(monitor); | |
305 | if (!device) | |
306 | return -ENOMEM; | |
307 | ||
505f8da7 | 308 | manager_udev_process_link(m, device); |
f579559b TG |
309 | return 0; |
310 | } | |
311 | ||
312 | int manager_udev_listen(Manager *m) { | |
313 | int r; | |
314 | ||
505f8da7 TG |
315 | if (detect_container(NULL) > 0) |
316 | return 0; | |
317 | ||
318 | assert(m->udev_monitor); | |
319 | ||
f579559b TG |
320 | r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL); |
321 | if (r < 0) { | |
322 | log_error("Could not add udev monitor filter: %s", strerror(-r)); | |
323 | return r; | |
324 | } | |
325 | ||
f579559b TG |
326 | r = udev_monitor_enable_receiving(m->udev_monitor); |
327 | if (r < 0) { | |
328 | log_error("Could not enable udev monitor"); | |
329 | return r; | |
330 | } | |
331 | ||
332 | r = sd_event_add_io(m->event, | |
151b9b96 | 333 | &m->udev_event_source, |
f579559b TG |
334 | udev_monitor_get_fd(m->udev_monitor), |
335 | EPOLLIN, manager_dispatch_link_udev, | |
151b9b96 | 336 | m); |
f579559b TG |
337 | if (r < 0) |
338 | return r; | |
339 | ||
340 | return 0; | |
341 | } | |
f882c247 TG |
342 | |
343 | int manager_rtnl_listen(Manager *m) { | |
344 | int r; | |
345 | ||
346 | r = sd_rtnl_attach_event(m->rtnl, m->event, 0); | |
347 | if (r < 0) | |
348 | return r; | |
349 | ||
dd3efc09 TG |
350 | r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m); |
351 | if (r < 0) | |
352 | return r; | |
353 | ||
f882c247 TG |
354 | return 0; |
355 | } | |
3bef724f | 356 | |
1346b1f0 TG |
357 | int manager_bus_listen(Manager *m) { |
358 | int r; | |
359 | ||
bcbca829 TG |
360 | assert(m->event); |
361 | ||
362 | if (!m->bus) /* TODO: drop when we can rely on kdbus */ | |
363 | return 0; | |
364 | ||
1346b1f0 TG |
365 | r = sd_bus_attach_event(m->bus, m->event, 0); |
366 | if (r < 0) | |
367 | return r; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
3bef724f TG |
372 | static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) { |
373 | char buf[INET6_ADDRSTRLEN]; | |
374 | const char *address; | |
375 | ||
376 | address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN); | |
377 | if (!address) { | |
378 | log_warning("Invalid DNS address. Ignoring."); | |
379 | return; | |
380 | } | |
381 | ||
382 | if (*count == MAXNS) | |
f3621dec TG |
383 | fputs("# Too many DNS servers configured, the following entries " |
384 | "will be ignored\n", f); | |
3bef724f TG |
385 | |
386 | fprintf(f, "nameserver %s\n", address); | |
387 | ||
388 | (*count) ++; | |
389 | } | |
390 | ||
391 | int manager_update_resolv_conf(Manager *m) { | |
392 | _cleanup_free_ char *temp_path = NULL; | |
393 | _cleanup_fclose_ FILE *f = NULL; | |
394 | Link *link; | |
395 | Iterator i; | |
396 | unsigned count = 0; | |
039ebe6a | 397 | const char *domainname = NULL; |
3bef724f TG |
398 | int r; |
399 | ||
400 | assert(m); | |
401 | ||
3bef724f TG |
402 | r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path); |
403 | if (r < 0) | |
404 | return r; | |
405 | ||
406 | fchmod(fileno(f), 0644); | |
407 | ||
b2ad8a16 TG |
408 | fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n" |
409 | "# Third party programs must not access this file directly, but\n" | |
410 | "# only through the symlink at /etc/resolv.conf. To manage\n" | |
411 | "# resolv.conf(5) in a different way, replace the symlink by a\n" | |
412 | "# static file or a different symlink.\n\n", f); | |
3bef724f TG |
413 | |
414 | HASHMAP_FOREACH(link, m->links, i) { | |
a6cc569e | 415 | if (link->dhcp_lease) { |
7ae4ef6d TG |
416 | struct in_addr *nameservers; |
417 | size_t nameservers_size; | |
3bef724f | 418 | |
039ebe6a | 419 | if (link->network->dhcp_dns) { |
a6cc569e | 420 | r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size); |
039ebe6a TG |
421 | if (r >= 0) { |
422 | unsigned j; | |
3bef724f | 423 | |
039ebe6a TG |
424 | for (j = 0; j < nameservers_size; j++) |
425 | append_dns(f, &nameservers[j], AF_INET, &count); | |
426 | } | |
427 | } | |
428 | ||
429 | if (link->network->dhcp_domainname && !domainname) { | |
a6cc569e | 430 | r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname); |
039ebe6a TG |
431 | if (r >= 0) |
432 | fprintf(f, "domain %s\n", domainname); | |
3bef724f TG |
433 | } |
434 | } | |
435 | } | |
436 | ||
06f021a8 TG |
437 | HASHMAP_FOREACH(link, m->links, i) { |
438 | if (link->network && link->network->dns) { | |
439 | Address *address; | |
440 | Iterator j; | |
441 | ||
442 | SET_FOREACH(address, link->network->dns, j) { | |
443 | append_dns(f, &address->in_addr.in, | |
444 | address->family, &count); | |
445 | } | |
446 | } | |
447 | } | |
3bef724f TG |
448 | |
449 | fflush(f); | |
450 | ||
451 | if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) { | |
452 | r = -errno; | |
453 | unlink("/run/systemd/network/resolv.conf"); | |
454 | unlink(temp_path); | |
455 | return r; | |
456 | } | |
457 | ||
458 | return 0; | |
459 | } |