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/>.
24 #include "path-util.h"
26 #include "libudev-private.h"
27 #include "udev-util.h"
28 #include "rtnl-util.h"
32 const char* const network_dirs[] = {
33 "/etc/systemd/network",
34 "/run/systemd/network",
35 "/usr/lib/systemd/network",
36 #ifdef HAVE_SPLIT_USER
37 "/lib/systemd/network",
41 int manager_new(Manager **ret) {
42 _cleanup_manager_free_ Manager *m = NULL;
49 r = sd_event_default(&m->event);
53 sd_event_set_watchdog(m->event, true);
55 r = sd_rtnl_open(&m->rtnl, RTMGRP_LINK | RTMGRP_IPV4_IFADDR);
59 r = sd_bus_default_system(&m->bus);
60 if (r < 0 && r != -ENOENT) /* TODO: drop when we can rely on kdbus */
67 /* udev does not initialize devices inside containers,
68 * so we rely on them being already initialized before
69 * entering the container */
70 if (detect_container(NULL) > 0) {
71 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "kernel");
75 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
80 m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
84 m->netdevs = hashmap_new(string_hash_func, string_compare_func);
88 LIST_HEAD_INIT(m->networks);
96 void manager_free(Manager *m) {
104 udev_monitor_unref(m->udev_monitor);
106 sd_bus_unref(m->bus);
107 sd_event_source_unref(m->udev_event_source);
108 sd_event_unref(m->event);
110 while ((network = m->networks))
111 network_free(network);
113 while ((link = hashmap_first(m->links)))
115 hashmap_free(m->links);
117 while ((netdev = hashmap_first(m->netdevs)))
119 hashmap_free(m->netdevs);
121 sd_rtnl_unref(m->rtnl);
126 int manager_load_config(Manager *m) {
129 /* update timestamp */
130 paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
143 bool manager_should_reload(Manager *m) {
144 return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
147 static int manager_process_link(Manager *m, struct udev_device *device) {
154 link_get(m, udev_device_get_ifindex(device), &link);
156 if (streq_ptr(udev_device_get_action(device), "remove")) {
157 log_debug("%s: link removed", udev_device_get_sysname(device));
163 log_debug("%s: link already exists, ignoring",
168 r = link_add(m, device, &link);
170 log_error("%s: could not handle link: %s",
171 udev_device_get_sysname(device),
174 log_debug("%s: link (with ifindex %" PRIu64") added",
175 link->ifname, link->ifindex);
181 int manager_udev_enumerate_links(Manager *m) {
182 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
183 struct udev_list_entry *item = NULL, *first = NULL;
188 e = udev_enumerate_new(m->udev);
192 r = udev_enumerate_add_match_subsystem(e, "net");
196 /* udev does not initialize devices inside containers,
197 * so we rely on them being already initialized before
198 * entering the container */
199 if (detect_container(NULL) <= 0) {
200 r = udev_enumerate_add_match_is_initialized(e);
205 r = udev_enumerate_scan_devices(e);
209 first = udev_enumerate_get_list_entry(e);
210 udev_list_entry_foreach(item, first) {
211 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
214 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
218 k = manager_process_link(m, d);
226 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
227 Manager *m = userdata;
228 struct udev_monitor *monitor = m->udev_monitor;
229 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
231 device = udev_monitor_receive_device(monitor);
235 manager_process_link(m, device);
239 int manager_udev_listen(Manager *m) {
242 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
244 log_error("Could not add udev monitor filter: %s", strerror(-r));
248 r = udev_monitor_enable_receiving(m->udev_monitor);
250 log_error("Could not enable udev monitor");
254 r = sd_event_add_io(m->event,
255 &m->udev_event_source,
256 udev_monitor_get_fd(m->udev_monitor),
257 EPOLLIN, manager_dispatch_link_udev,
265 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
266 Manager *m = userdata;
275 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
276 if (r < 0 || ifindex <= 0) {
277 log_debug("received RTM_NEWLINK message without valid ifindex");
281 r = rtnl_message_link_get_ifname(message, &name);
283 log_debug("received RTM_NEWLINK message without valid IFLA_IFNAME");
287 r = netdev_get(m, name, &netdev);
289 r = netdev_set_ifindex(netdev, ifindex);
291 log_debug("could not set ifindex of netdev '%s' to %d: %s",
292 name, ifindex, strerror(-r));
296 r = link_get(m, ifindex, &link);
298 log_debug("received RTM_NEWLINK message for untracked ifindex %d", ifindex);
302 /* only track the status of links we want to manage */
304 r = link_update(link, message);
308 log_debug("%s: received RTM_NEWLINK message for unmanaged link", link->ifname);
313 int manager_rtnl_listen(Manager *m) {
316 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
320 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
327 int manager_bus_listen(Manager *m) {
332 if (!m->bus) /* TODO: drop when we can rely on kdbus */
335 r = sd_bus_attach_event(m->bus, m->event, 0);
342 static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
343 char buf[INET6_ADDRSTRLEN];
346 address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
348 log_warning("Invalid DNS address. Ignoring.");
353 fputs("# Too many DNS servers configured, the following entries "
354 "will be ignored\n", f);
356 fprintf(f, "nameserver %s\n", address);
361 int manager_update_resolv_conf(Manager *m) {
362 _cleanup_free_ char *temp_path = NULL;
363 _cleanup_fclose_ FILE *f = NULL;
367 const char *domainname = NULL;
372 r = mkdir_safe_label("/run/systemd/network", 0755, 0, 0);
376 r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
380 fchmod(fileno(f), 0644);
382 fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n"
383 "# Third party programs must not access this file directly, but\n"
384 "# only through the symlink at /etc/resolv.conf. To manage\n"
385 "# resolv.conf(5) in a different way, replace the symlink by a\n"
386 "# static file or a different symlink.\n\n", f);
388 HASHMAP_FOREACH(link, m->links, i) {
389 if (link->dhcp_lease) {
390 struct in_addr *nameservers;
391 size_t nameservers_size;
393 if (link->network->dhcp_dns) {
394 r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size);
398 for (j = 0; j < nameservers_size; j++)
399 append_dns(f, &nameservers[j], AF_INET, &count);
403 if (link->network->dhcp_domainname && !domainname) {
404 r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
406 fprintf(f, "domain %s\n", domainname);
411 HASHMAP_FOREACH(link, m->links, i)
412 if (link->network && link->network->dns)
413 append_dns(f, &link->network->dns->in_addr.in,
414 link->network->dns->family, &count);
418 if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
420 unlink("/run/systemd/network/resolv.conf");