diff options
Diffstat (limited to 'src/network/networkd.c')
| -rw-r--r-- | src/network/networkd.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/network/networkd.c b/src/network/networkd.c new file mode 100644 index 0000000..d61769d --- /dev/null +++ b/src/network/networkd.c @@ -0,0 +1,121 @@ +/* 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); |