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, 3, RTNLGRP_LINK, RTNLGRP_IPV4_IFADDR,
99 r = sd_bus_default_system(&m->bus);
100 if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
103 r = setup_signals(m);
107 /* udev does not initialize devices inside containers,
108 * so we rely on them being already initialized before
109 * entering the container */
110 if (detect_container(NULL) <= 0) {
111 m->udev = udev_new();
115 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
116 if (!m->udev_monitor)
120 m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
124 m->netdevs = hashmap_new(string_hash_func, string_compare_func);
128 LIST_HEAD_INIT(m->networks);
136 void manager_free(Manager *m) {
146 udev_monitor_unref(m->udev_monitor);
148 sd_bus_unref(m->bus);
149 sd_event_source_unref(m->udev_event_source);
150 sd_event_source_unref(m->sigterm_event_source);
151 sd_event_source_unref(m->sigint_event_source);
152 sd_event_unref(m->event);
154 while ((link = hashmap_first(m->links)))
156 hashmap_free(m->links);
158 while ((network = m->networks))
159 network_free(network);
161 while ((netdev = hashmap_first(m->netdevs)))
162 netdev_unref(netdev);
163 hashmap_free(m->netdevs);
165 sd_rtnl_unref(m->rtnl);
170 int manager_load_config(Manager *m) {
173 /* update timestamp */
174 paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
187 bool manager_should_reload(Manager *m) {
188 return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
191 static int manager_udev_process_link(Manager *m, struct udev_device *device) {
198 if (!streq_ptr(udev_device_get_action(device), "add"))
201 ifindex = udev_device_get_ifindex(device);
203 log_debug("ignoring udev ADD event for device with invalid ifindex");
207 r = link_get(m, ifindex, &link);
213 r = link_initialized(link, device);
220 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
221 Manager *m = userdata;
223 NetDev *netdev = NULL;
232 r = sd_rtnl_message_get_type(message, &type);
234 log_warning("rtnl: could not get message type");
238 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
239 if (r < 0 || ifindex <= 0) {
240 log_warning("rtnl: received link message without valid ifindex");
243 link_get(m, ifindex, &link);
245 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
246 if (r < 0 || !name) {
247 log_warning("rtnl: received link message without valid ifname");
250 netdev_get(m, name, &netdev);
255 /* link is new, so add it */
256 r = link_add(m, message, &link);
258 log_debug("could not add new link");
264 /* netdev exists, so make sure the ifindex matches */
265 r = netdev_set_ifindex(netdev, message);
267 log_debug("could not set ifindex on netdev");
272 r = link_update(link, message);
285 assert_not_reached("Received invalid RTNL message type.");
291 int manager_rtnl_enumerate_links(Manager *m) {
292 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
293 sd_rtnl_message *link;
299 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
303 r = sd_rtnl_message_request_dump(req, true);
307 r = sd_rtnl_call(m->rtnl, req, 0, &reply);
311 for (link = reply; link; link = sd_rtnl_message_next(link)) {
314 k = sd_rtnl_message_get_type(link, &type);
318 if (type != RTM_NEWLINK)
321 k = manager_rtnl_process_link(m->rtnl, link, m);
329 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
330 Manager *m = userdata;
331 struct udev_monitor *monitor = m->udev_monitor;
332 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
334 device = udev_monitor_receive_device(monitor);
338 manager_udev_process_link(m, device);
342 int manager_udev_listen(Manager *m) {
345 if (detect_container(NULL) > 0)
348 assert(m->udev_monitor);
350 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
352 log_error("Could not add udev monitor filter: %s", strerror(-r));
356 r = udev_monitor_enable_receiving(m->udev_monitor);
358 log_error("Could not enable udev monitor");
362 r = sd_event_add_io(m->event,
363 &m->udev_event_source,
364 udev_monitor_get_fd(m->udev_monitor),
365 EPOLLIN, manager_dispatch_link_udev,
373 int manager_rtnl_listen(Manager *m) {
376 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
380 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
384 r = sd_rtnl_add_match(m->rtnl, RTM_DELLINK, &manager_rtnl_process_link, m);
391 int manager_bus_listen(Manager *m) {
396 if (!m->bus) /* TODO: drop when we can rely on kdbus */
399 r = sd_bus_attach_event(m->bus, m->event, 0);
406 static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
407 char buf[INET6_ADDRSTRLEN];
410 address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
412 log_warning("Invalid DNS address. Ignoring.");
417 fputs("# Too many DNS servers configured, the following entries "
418 "will be ignored\n", f);
420 fprintf(f, "nameserver %s\n", address);
425 int manager_update_resolv_conf(Manager *m) {
426 _cleanup_free_ char *temp_path = NULL;
427 _cleanup_fclose_ FILE *f = NULL;
431 const char *domainname = NULL;
436 r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
440 fchmod(fileno(f), 0644);
442 fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n"
443 "# Third party programs must not access this file directly, but\n"
444 "# only through the symlink at /etc/resolv.conf. To manage\n"
445 "# resolv.conf(5) in a different way, replace the symlink by a\n"
446 "# static file or a different symlink.\n\n", f);
448 HASHMAP_FOREACH(link, m->links, i) {
449 if (link->dhcp_lease) {
450 struct in_addr *nameservers;
451 size_t nameservers_size;
453 if (link->network->dhcp_dns) {
454 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size);
458 for (j = 0; j < nameservers_size; j++)
459 append_dns(f, &nameservers[j], AF_INET, &count);
463 if (link->network->dhcp_domainname && !domainname) {
464 r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
466 fprintf(f, "domain %s\n", domainname);
471 HASHMAP_FOREACH(link, m->links, i) {
472 if (link->network && link->network->dns) {
476 SET_FOREACH(address, link->network->dns, j) {
477 append_dns(f, &address->in_addr.in,
478 address->family, &count);
485 if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
487 unlink("/run/systemd/network/resolv.conf");
495 int manager_save(Manager *m) {
498 _cleanup_free_ char *temp_path = NULL;
499 _cleanup_fclose_ FILE *f = NULL;
500 const char *oper_state = "unknown";
501 bool dormant = false, carrier = false;
505 assert(m->state_file);
507 HASHMAP_FOREACH(link, m->links, i) {
508 if (link->flags & IFF_LOOPBACK)
511 if (link_has_carrier(link->flags, link->operstate))
513 else if (link->operstate == IF_OPER_DORMANT)
518 oper_state = "carrier";
520 oper_state = "dormant";
522 r = fopen_temporary(m->state_file, &f, &temp_path);
526 fchmod(fileno(f), 0644);
529 "# This is private data. Do not parse.\n"
530 "OPER_STATE=%s\n", oper_state);
534 if (ferror(f) || rename(temp_path, m->state_file) < 0) {
536 unlink(m->state_file);
542 log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));