src/network/networkd.c

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