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"
30 const char* const network_dirs[] = {
31 "/etc/systemd/network",
32 "/run/systemd/network",
33 "/usr/lib/systemd/network",
34 #ifdef HAVE_SPLIT_USER
35 "/lib/systemd/network",
39 int manager_new(Manager **ret) {
40 _cleanup_manager_free_ Manager *m = NULL;
47 r = sd_event_default(&m->event);
51 sd_event_set_watchdog(m->event, true);
53 r = sd_rtnl_open(RTMGRP_LINK | RTMGRP_IPV4_IFADDR, &m->rtnl);
57 r = sd_bus_default_system(&m->bus);
65 m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
69 m->links = hashmap_new(uint64_hash_func, uint64_compare_func);
73 m->bridges = hashmap_new(string_hash_func, string_compare_func);
77 LIST_HEAD_INIT(m->networks);
85 void manager_free(Manager *m) {
90 udev_monitor_unref(m->udev_monitor);
93 sd_event_source_unref(m->udev_event_source);
94 sd_event_unref(m->event);
96 while ((network = m->networks))
97 network_free(network);
99 while ((link = hashmap_first(m->links)))
101 hashmap_free(m->links);
103 while ((bridge = hashmap_first(m->bridges)))
105 hashmap_free(m->bridges);
107 sd_rtnl_unref(m->rtnl);
112 int manager_load_config(Manager *m) {
115 /* update timestamp */
116 paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, true);
129 bool manager_should_reload(Manager *m) {
130 return paths_check_timestamp(network_dirs, &m->network_dirs_ts_usec, false);
133 static int manager_process_link(Manager *m, struct udev_device *device) {
137 if (streq_ptr(udev_device_get_action(device), "remove")) {
140 log_debug("%s: link removed", udev_device_get_sysname(device));
142 ifindex = udev_device_get_ifindex(device);
143 link = hashmap_get(m->links, &ifindex);
149 r = link_add(m, device, &link);
152 log_debug("%s: link already exists, ignoring",
155 log_error("%s: could not handle link: %s",
156 udev_device_get_sysname(device),
159 log_debug("%s: link (with ifindex %" PRIu64") added",
160 link->ifname, link->ifindex);
166 int manager_udev_enumerate_links(Manager *m) {
167 _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
168 struct udev_list_entry *item = NULL, *first = NULL;
173 e = udev_enumerate_new(m->udev);
177 r = udev_enumerate_add_match_subsystem(e, "net");
181 r = udev_enumerate_add_match_is_initialized(e);
185 r = udev_enumerate_scan_devices(e);
189 first = udev_enumerate_get_list_entry(e);
190 udev_list_entry_foreach(item, first) {
191 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
194 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
198 k = manager_process_link(m, d);
206 static int manager_dispatch_link_udev(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
207 Manager *m = userdata;
208 struct udev_monitor *monitor = m->udev_monitor;
209 _cleanup_udev_device_unref_ struct udev_device *device = NULL;
211 device = udev_monitor_receive_device(monitor);
215 manager_process_link(m, device);
219 int manager_udev_listen(Manager *m) {
222 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_monitor, "net", NULL);
224 log_error("Could not add udev monitor filter: %s", strerror(-r));
228 r = udev_monitor_enable_receiving(m->udev_monitor);
230 log_error("Could not enable udev monitor");
234 r = sd_event_add_io(m->event,
235 udev_monitor_get_fd(m->udev_monitor),
236 EPOLLIN, manager_dispatch_link_udev,
237 m, &m->udev_event_source);
244 static int manager_rtnl_process_link(sd_rtnl *rtnl, sd_rtnl_message *message, void *userdata) {
245 Manager *m = userdata;
250 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
252 log_debug("received RTM_NEWLINK message without valid ifindex");
256 ifindex_64 = ifindex;
257 link = hashmap_get(m->links, &ifindex_64);
259 log_debug("received RTM_NEWLINK message for untracked ifindex %d", ifindex);
263 /* only track the status of links we want to manage */
265 r = link_update(link, message);
269 log_debug("%s: received RTM_NEWLINK message for unmanaged link", link->ifname);
274 int manager_rtnl_listen(Manager *m) {
277 r = sd_rtnl_attach_event(m->rtnl, m->event, 0);
281 r = sd_rtnl_add_match(m->rtnl, RTM_NEWLINK, &manager_rtnl_process_link, m);
288 int manager_bus_listen(Manager *m) {
291 r = sd_bus_attach_event(m->bus, m->event, 0);
298 static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
299 char buf[INET6_ADDRSTRLEN];
302 address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
304 log_warning("Invalid DNS address. Ignoring.");
309 fputs("# Too many DNS servers configured, the following entries "
310 "will be ignored\n", f);
312 fprintf(f, "nameserver %s\n", address);
317 int manager_update_resolv_conf(Manager *m) {
318 _cleanup_free_ char *temp_path = NULL;
319 _cleanup_fclose_ FILE *f = NULL;
327 r = mkdir_safe_label("/run/systemd/network", 0755, 0, 0);
331 r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
335 fchmod(fileno(f), 0644);
337 fputs("# This file is managed by systemd-networkd(8). Do not edit.\n", f);
339 HASHMAP_FOREACH(link, m->links, i) {
341 struct in_addr *nameservers;
342 size_t nameservers_size;
344 r = sd_dhcp_client_get_dns(link->dhcp, &nameservers, &nameservers_size);
348 for (j = 0; j < nameservers_size; j++)
349 append_dns(f, &nameservers[j], AF_INET, &count);
354 HASHMAP_FOREACH(link, m->links, i)
355 if (link->network && link->network->dns)
356 append_dns(f, &link->network->dns->in_addr.in,
357 link->network->dns->family, &count);
361 if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
363 unlink("/run/systemd/network/resolv.conf");