1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Tom Gundersen <teg@jklm.no>
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.
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.
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/>.
25 #include "path-util.h"
27 #include "libudev-private.h"
28 #include "udev-util.h"
29 #include "rtnl-util.h"
35 const char* const network_dirs[] = {
36 "/etc/systemd/network",
37 "/run/systemd/network",
38 "/usr/lib/systemd/network",
40 "/lib/systemd/network",
44 static int dispatch_sigterm(sd_event_source *es, const struct signalfd_siginfo *si, void *userdata) {
45 Manager *m = userdata;
49 log_received_signal(LOG_INFO, si);
51 sd_event_exit(m->event, 0);
55 static int setup_signals(Manager *m) {
61 assert_se(sigemptyset(&mask) == 0);
62 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
63 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
65 r = sd_event_add_signal(m->event, &m->sigterm_event_source, SIGTERM, dispatch_sigterm, m);
69 r = sd_event_add_signal(m->event, &m->sigint_event_source, SIGINT, dispatch_sigterm, m);
76 int manager_new(Manager **ret) {
77 _cleanup_manager_free_ Manager *m = NULL;
84 m->state_file = strdup("/run/systemd/network/state");
88 r = sd_event_default(&m->event);
92 sd_event_set_watchdog(m->event, true);
94 r = sd_rtnl_open(&m->rtnl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR);
98 r = sd_bus_default_system(&m->bus);
99 if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
102 r = setup_signals(m);
106 /* udev does not initialize devices inside containers,
107 * so we rely on them being already initialized before
108 * entering the container */
109 if (detect_container(NULL) <= 0) {
110 m->udev = udev_new();
114 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
115 if (!m->udev_monitor)
119 m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
123 m->netdevs = hashmap_new(string_hash_func, string_compare_func);
127 LIST_HEAD_INIT(m->networks);
135 void manager_free(Manager *m) {
145 udev_monitor_unref(m->udev_monitor);
147 sd_bus_unref(m->bus);
148 sd_event_source_unref(m->udev_event_source);
149 sd_event_source_unref(m->sigterm_event_source);
150 sd_event_source_unref(m->sigint_event_source);
151 sd_event_unref(m->event);
153 while ((link = hashmap_first(m->links)))
155 hashmap_free(m->links);
157 while ((network = m->networks))
158 network_free(network);
160 while ((netdev = hashmap_first(m->netdevs)))
161 netdev_unref(netdev);
162 hashmap_free(m->netdevs);
164 sd_rtnl_unref(m->rtnl);
169 int manager_load_config(Manager *m) {
172 /* update timestamp */
173 paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
186 bool manager_should_reload(Manager *m) {
187 return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
190 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
197 if (!streq_ptr(udev_device_get_action(device), "add"))
200 ifindex = udev_device_get_ifindex(device);
202 log_debug("ignoring udev ADD event for device with invalid ifindex");
206 r = link_get(m, ifindex, &link);
212 r = link_initialized(link, device);
219 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
220 Manager *m = userdata;
230 r = sd_rtnl_message_get_type(message, &type);
232 log_warning("rtnl: could not get message type");
236 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
237 if (r < 0 || ifindex <= 0) {
238 log_warning("rtnl: received link message without valid ifindex");
242 link_get(m, ifindex, &link);
243 if (type == RTM_DELLINK)
246 /* link is new, so add it */
247 r = link_add(m, message, &link);
249 log_debug("could not add new link");
254 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
256 log_warning("rtnl: received link message without valid ifname");
258 NetDev *netdev = NULL;
260 netdev_get(m, name, &netdev);
261 if (type == RTM_DELLINK)
264 r = netdev_set_ifindex(netdev, message);
266 log_debug("could not set ifindex on netdev");
272 if (type == RTM_NEWLINK) {
273 r = link_update(link, message);
281 int manager_rtnl_enumerate_links(Manager *m) {
282 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
283 sd_rtnl_message *link;
289 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
293 r = sd_rtnl_message_request_dump(req, true);
297 r = sd_rtnl_call(m->rtnl, req, 0, &reply);
301 for (link = reply; link; link = sd_rtnl_message_next(link)) {
304 k = sd_rtnl_message_get_type(link, &type);
308 if (type != RTM_NEWLINK)
311 k = manager_rtnl_process_link(m->rtnl, link, m);
319 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
320 Manager *m = userdata;
321 struct udev_monitor *monitor = m->udev_monitor;
322 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
324 device = udev_monitor_receive_device(monitor);
328 manager_udev_process_link(m, device);
332 int manager_udev_listen(Manager *m) {
335 if (detect_container(NULL) > 0)
338 assert(m->udev_monitor);
340 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
342 log_error("Could not add udev monitor filter: %s", strerror(-r));
346 r = udev_monitor_enable_receiving(m->udev_monitor);
348 log_error("Could not enable udev monitor");
352 r = sd_event_add_io(m->event,
353 &m->udev_event_source,
354 udev_monitor_get_fd(m->udev_monitor),
355 EPOLLIN, manager_dispatch_link_udev,
363 int manager_rtnl_listen(Manager *m) {
366 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
370 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
374 r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
381 int manager_bus_listen(Manager *m) {
386 if (!m->bus) /* TODO: drop when we can rely on kdbus */
389 r = sd_bus_attach_event(m->bus, m->event, 0);
396 static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
397 char buf[INET6_ADDRSTRLEN];
400 address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
402 log_warning("Invalid DNS address. Ignoring.");
407 fputs("# Too many DNS servers configured, the following entries "
408 "will be ignored\n", f);
410 fprintf(f, "nameserver %s\n", address);
415 int manager_update_resolv_conf(Manager *m) {
416 _cleanup_free_ char *temp_path = NULL;
417 _cleanup_fclose_ FILE *f = NULL;
421 const char *domainname = NULL;
426 r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
430 fchmod(fileno(f), 0644);
432 fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n"
433 "# Third party programs must not access this file directly, but\n"
434 "# only through the symlink at /etc/resolv.conf. To manage\n"
435 "# resolv.conf(5) in a different way, replace the symlink by a\n"
436 "# static file or a different symlink.\n\n", f);
438 HASHMAP_FOREACH(link, m->links, i) {
439 if (link->dhcp_lease) {
440 struct in_addr *nameservers;
441 size_t nameservers_size;
443 if (link->network->dhcp_dns) {
444 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size);
448 for (j = 0; j < nameservers_size; j++)
449 append_dns(f, &nameservers[j], AF_INET, &count);
453 if (link->network->dhcp_domainname && !domainname) {
454 r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
456 fprintf(f, "domain %s\n", domainname);
461 HASHMAP_FOREACH(link, m->links, i) {
462 if (link->network && link->network->dns) {
466 SET_FOREACH(address, link->network->dns, j) {
467 append_dns(f, &address->in_addr.in,
468 address->family, &count);
475 if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
477 unlink("/run/systemd/network/resolv.conf");
485 int manager_save(Manager *m) {
488 _cleanup_free_ char *temp_path = NULL;
489 _cleanup_fclose_ FILE *f = NULL;
490 const char *oper_state = "unknown";
491 bool dormant, carrier;
495 assert(m->state_file);
497 HASHMAP_FOREACH(link, m->links, i) {
498 if (link->flags & IFF_LOOPBACK)
501 if (link_has_carrier(link->flags, link->operstate))
503 else if (link->operstate == IF_OPER_DORMANT)
508 oper_state = "carrier";
510 oper_state = "dormant";
512 r = fopen_temporary(m->state_file, &f, &temp_path);
516 fchmod(fileno(f), 0644);
519 "# This is private data. Do not parse.\n"
520 "OPER_STATE=%s\n", oper_state);
524 if (ferror(f) || rename(temp_path, m->state_file) < 0) {
526 unlink(m->state_file);
532 log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));