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;
229 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
230 if (r < 0 || ifindex <= 0) {
231 log_warning("rtnl: received link message without valid ifindex");
235 link_get(m, ifindex, &link);
237 /* link is new, so add it */
238 r = link_add(m, message, &link);
240 log_debug("could not add new link");
245 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &name);
247 log_warning("rtnl: received link message without valid ifname");
251 r = netdev_get(m, name, &netdev);
253 r = netdev_set_ifindex(netdev, message);
255 log_debug("could not set ifindex on netdev");
261 r = link_update(link, message);
268 int manager_rtnl_enumerate_links(Manager *m) {
269 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL, *reply = NULL;
270 sd_rtnl_message *link;
276 r = sd_rtnl_message_new_link(m->rtnl, &req, RTM_GETLINK, 0);
280 r = sd_rtnl_message_request_dump(req, true);
284 r = sd_rtnl_call(m->rtnl, req, 0, &reply);
288 for (link = reply; link; link = sd_rtnl_message_next(link)) {
291 k = sd_rtnl_message_get_type(link, &type);
295 if (type != RTM_NEWLINK)
298 k = manager_rtnl_process_link(m->rtnl, link, m);
306 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
307 Manager *m = userdata;
308 struct udev_monitor *monitor = m->udev_monitor;
309 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
311 device = udev_monitor_receive_device(monitor);
315 manager_udev_process_link(m, device);
319 int manager_udev_listen(Manager *m) {
322 if (detect_container(NULL) > 0)
325 assert(m->udev_monitor);
327 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
329 log_error("Could not add udev monitor filter: %s", strerror(-r));
333 r = udev_monitor_enable_receiving(m->udev_monitor);
335 log_error("Could not enable udev monitor");
339 r = sd_event_add_io(m->event,
340 &m->udev_event_source,
341 udev_monitor_get_fd(m->udev_monitor),
342 EPOLLIN, manager_dispatch_link_udev,
350 int manager_rtnl_listen(Manager *m) {
353 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
357 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
364 int manager_bus_listen(Manager *m) {
369 if (!m->bus) /* TODO: drop when we can rely on kdbus */
372 r = sd_bus_attach_event(m->bus, m->event, 0);
379 static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
380 char buf[INET6_ADDRSTRLEN];
383 address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
385 log_warning("Invalid DNS address. Ignoring.");
390 fputs("# Too many DNS servers configured, the following entries "
391 "will be ignored\n", f);
393 fprintf(f, "nameserver %s\n", address);
398 int manager_update_resolv_conf(Manager *m) {
399 _cleanup_free_ char *temp_path = NULL;
400 _cleanup_fclose_ FILE *f = NULL;
404 const char *domainname = NULL;
409 r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
413 fchmod(fileno(f), 0644);
415 fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n"
416 "# Third party programs must not access this file directly, but\n"
417 "# only through the symlink at /etc/resolv.conf. To manage\n"
418 "# resolv.conf(5) in a different way, replace the symlink by a\n"
419 "# static file or a different symlink.\n\n", f);
421 HASHMAP_FOREACH(link, m->links, i) {
422 if (link->dhcp_lease) {
423 struct in_addr *nameservers;
424 size_t nameservers_size;
426 if (link->network->dhcp_dns) {
427 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size);
431 for (j = 0; j < nameservers_size; j++)
432 append_dns(f, &nameservers[j], AF_INET, &count);
436 if (link->network->dhcp_domainname && !domainname) {
437 r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
439 fprintf(f, "domain %s\n", domainname);
444 HASHMAP_FOREACH(link, m->links, i) {
445 if (link->network && link->network->dns) {
449 SET_FOREACH(address, link->network->dns, j) {
450 append_dns(f, &address->in_addr.in,
451 address->family, &count);
458 if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
460 unlink("/run/systemd/network/resolv.conf");
468 int manager_save(Manager *m) {
471 _cleanup_free_ char *temp_path = NULL;
472 _cleanup_fclose_ FILE *f = NULL;
473 const char *oper_state = "unknown";
474 bool dormant, carrier;
478 assert(m->state_file);
480 HASHMAP_FOREACH(link, m->links, i) {
481 if (link->flags & IFF_LOOPBACK)
484 if (link_has_carrier(link->flags, link->operstate))
486 else if (link->operstate == IF_OPER_DORMANT)
491 oper_state = "carrier";
493 oper_state = "dormant";
495 r = fopen_temporary(m->state_file, &f, &temp_path);
499 fchmod(fileno(f), 0644);
502 "# This is private data. Do not parse.\n"
503 "OPER_STATE=%s\n", oper_state);
507 if (ferror(f) || rename(temp_path, m->state_file) < 0) {
509 unlink(m->state_file);
515 log_error("Failed to save network state to %s: %s", m->state_file, strerror(-r));