src/network/networkd.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2013 Tom Gundersen <teg@jklm.no>
   6 ***/
   7
   8 #include "sd-daemon.h"
   9 #include "sd-event.h"
  10
  11 #include "capability-util.h"
  12 #include "networkd-conf.h"
  13 #include "networkd-manager.h"
  14 #include "signal-util.h"
  15 #include "user-util.h"
  16
  17 int main(int argc, char *argv[]) {
  18         sd_event *event = NULL;
  19         _cleanup_manager_free_ Manager *m = NULL;
  20         const char *user = "systemd-network";
  21         uid_t uid;
  22         gid_t gid;
  23         int r;
  24
  25         log_set_target(LOG_TARGET_AUTO);
  26         log_parse_environment();
  27         log_open();
  28
  29         umask(0022);
  30
  31         if (argc != 1) {
  32                 log_error("This program takes no arguments.");
  33                 r = -EINVAL;
  34                 goto out;
  35         }
  36
  37         r = get_user_creds(&user, &uid, &gid, NULL, NULL);
  38         if (r < 0) {
  39                 log_error_errno(r, "Cannot resolve user name %s: %m", user);
  40                 goto out;
  41         }
  42
  43         /* Create runtime directory. This is not necessary when networkd is
  44          * started with "RuntimeDirectory=systemd/netif", or after
  45          * systemd-tmpfiles-setup.service. */
  46         r = mkdir_safe_label("/run/systemd/netif", 0755, uid, gid, MKDIR_WARN_MODE);
  47         if (r < 0)
  48                 log_warning_errno(r, "Could not create runtime directory: %m");
  49
  50         /* Drop privileges, but only if we have been started as root. If we are not running as root we assume all
  51          * privileges are already dropped. */
  52         if (geteuid() == 0) {
  53                 r = drop_privileges(uid, gid,
  54                                     (1ULL << CAP_NET_ADMIN) |
  55                                     (1ULL << CAP_NET_BIND_SERVICE) |
  56                                     (1ULL << CAP_NET_BROADCAST) |
  57                                     (1ULL << CAP_NET_RAW));
  58                 if (r < 0)
  59                         goto out;
  60         }
  61
  62         /* Always create the directories people can create inotify watches in.
  63          * It is necessary to create the following subdirectories after drop_privileges()
  64          * to support old kernels not supporting AmbientCapabilities=. */
  65         r = mkdir_safe_label("/run/systemd/netif/links", 0755, uid, gid, MKDIR_WARN_MODE);
  66         if (r < 0)
  67                 log_warning_errno(r, "Could not create runtime directory 'links': %m");
  68
  69         r = mkdir_safe_label("/run/systemd/netif/leases", 0755, uid, gid, MKDIR_WARN_MODE);
  70         if (r < 0)
  71                 log_warning_errno(r, "Could not create runtime directory 'leases': %m");
  72
  73         r = mkdir_safe_label("/run/systemd/netif/lldp", 0755, uid, gid, MKDIR_WARN_MODE);
  74         if (r < 0)
  75                 log_warning_errno(r, "Could not create runtime directory 'lldp': %m");
  76
  77         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
  78
  79         r = sd_event_default(&event);
  80         if (r < 0)
  81                 goto out;
  82
  83         sd_event_set_watchdog(event, true);
  84         sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
  85         sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
  86
  87         r = manager_new(&m, event);
  88         if (r < 0) {
  89                 log_error_errno(r, "Could not create manager: %m");
  90                 goto out;
  91         }
  92
  93         r = manager_connect_bus(m);
  94         if (r < 0) {
  95                 log_error_errno(r, "Could not connect to bus: %m");
  96                 goto out;
  97         }
  98
  99         r = manager_parse_config_file(m);
 100         if (r < 0)
 101                 log_warning_errno(r, "Failed to parse configuration file: %m");
 102
 103         r = manager_load_config(m);
 104         if (r < 0) {
 105                 log_error_errno(r, "Could not load configuration files: %m");
 106                 goto out;
 107         }
 108
 109         r = manager_rtnl_enumerate_links(m);
 110         if (r < 0) {
 111                 log_error_errno(r, "Could not enumerate links: %m");
 112                 goto out;
 113         }
 114
 115         r = manager_rtnl_enumerate_addresses(m);
 116         if (r < 0) {
 117                 log_error_errno(r, "Could not enumerate addresses: %m");
 118                 goto out;
 119         }
 120
 121         r = manager_rtnl_enumerate_routes(m);
 122         if (r < 0) {
 123                 log_error_errno(r, "Could not enumerate routes: %m");
 124                 goto out;
 125         }
 126
 127         r = manager_rtnl_enumerate_rules(m);
 128         if (r < 0) {
 129                 log_error_errno(r, "Could not enumerate rules: %m");
 130                 goto out;
 131         }
 132
 133         r = manager_start(m);
 134         if (r < 0) {
 135                 log_error_errno(r, "Could not start manager: %m");
 136                 goto out;
 137         }
 138
 139         log_info("Enumeration completed");
 140
 141         sd_notify(false,
 142                   "READY=1\n"
 143                   "STATUS=Processing requests...");
 144
 145         r = sd_event_loop(event);
 146         if (r < 0) {
 147                 log_error_errno(r, "Event loop failed: %m");
 148                 goto out;
 149         }
 150 out:
 151         sd_notify(false,
 152                   "STOPPING=1\n"
 153                   "STATUS=Shutting down...");
 154
 155         sd_event_unref(event);
 156
 157         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 158 }