src/network/networkd.c

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