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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <netinet/in.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "sd-daemon.h"
#include "sd-event.h"
#include "bus-log-control-api.h"
#include "capability-util.h"
#include "daemon-util.h"
#include "firewall-util.h"
#include "main-func.h"
#include "mkdir-label.h"
#include "networkd-conf.h"
#include "networkd-manager-bus.h"
#include "networkd-manager.h"
#include "service-util.h"
#include "signal-util.h"
#include "user-util.h"
static int run(int argc, char *argv[]) {
_cleanup_(manager_freep) Manager *m = NULL;
_unused_ _cleanup_(notify_on_cleanup) const char *notify_message = NULL;
int r;
log_setup();
r = service_parse_argv("systemd-networkd.service",
"Manage and configure network devices, create virtual network devices",
BUS_IMPLEMENTATIONS(&manager_object, &log_control_object),
argc, argv);
if (r <= 0)
return r;
umask(0022);
if (argc != 1)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");
/* Drop privileges, but only if we have been started as root. If we are not running as root we assume all
* privileges are already dropped and we can't create our runtime directory. */
if (geteuid() == 0) {
const char *user = "systemd-network";
uid_t uid;
gid_t gid;
r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
if (r < 0)
return log_error_errno(r, "Cannot resolve user name %s: %m", user);
/* Create runtime directory. This is not necessary when networkd is
* started with "RuntimeDirectory=systemd/netif", or after
* systemd-tmpfiles-setup.service. */
r = mkdir_safe_label("/run/systemd/netif", 0755, uid, gid, MKDIR_WARN_MODE);
if (r < 0)
log_warning_errno(r, "Could not create runtime directory: %m");
r = drop_privileges(uid, gid,
(1ULL << CAP_NET_ADMIN) |
(1ULL << CAP_NET_BIND_SERVICE) |
(1ULL << CAP_NET_BROADCAST) |
(1ULL << CAP_NET_RAW));
if (r < 0)
return log_error_errno(r, "Failed to drop privileges: %m");
}
/* Always create the directories people can create inotify watches in.
* It is necessary to create the following subdirectories after drop_privileges()
* to support old kernels not supporting AmbientCapabilities=. */
r = mkdir_safe_label("/run/systemd/netif/links", 0755, UID_INVALID, GID_INVALID, MKDIR_WARN_MODE);
if (r < 0)
log_warning_errno(r, "Could not create runtime directory 'links': %m");
r = mkdir_safe_label("/run/systemd/netif/leases", 0755, UID_INVALID, GID_INVALID, MKDIR_WARN_MODE);
if (r < 0)
log_warning_errno(r, "Could not create runtime directory 'leases': %m");
r = mkdir_safe_label("/run/systemd/netif/lldp", 0755, UID_INVALID, GID_INVALID, MKDIR_WARN_MODE);
if (r < 0)
log_warning_errno(r, "Could not create runtime directory 'lldp': %m");
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
r = manager_new(&m, /* test_mode = */ false);
if (r < 0)
return log_error_errno(r, "Could not create manager: %m");
r = manager_setup(m);
if (r < 0)
return log_error_errno(r, "Could not setup manager: %m");
r = manager_parse_config_file(m);
if (r < 0)
log_warning_errno(r, "Failed to parse configuration file: %m");
r = manager_load_config(m);
if (r < 0)
return log_error_errno(r, "Could not load configuration files: %m");
r = manager_enumerate(m);
if (r < 0)
return r;
r = manager_start(m);
if (r < 0)
return log_error_errno(r, "Could not start manager: %m");
log_info("Enumeration completed");
notify_message = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
r = sd_event_loop(m->event);
if (r < 0)
return log_error_errno(r, "Event loop failed: %m");
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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