src/network/networkd.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <sys/stat.h>
   5 #include <sys/types.h>
   6
   7 #include "sd-daemon.h"
   8 #include "sd-event.h"
   9
  10 #include "capability-util.h"
  11 #include "daemon-util.h"
  12 #include "main-func.h"
  13 #include "mkdir.h"
  14 #include "networkd-conf.h"
  15 #include "networkd-manager.h"
  16 #include "signal-util.h"
  17 #include "user-util.h"
  18
  19 static int run(int argc, char *argv[]) {
  20         _cleanup_(notify_on_cleanup) const char *notify_message = NULL;
  21         _cleanup_(manager_freep) Manager *m = NULL;
  22         const char *user = "systemd-network";
  23         uid_t uid;
  24         gid_t gid;
  25         int r;
  26
  27         log_setup_service();
  28
  29         umask(0022);
  30
  31         if (argc != 1)
  32                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");
  33
  34         r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
  35         if (r < 0)
  36                 return log_error_errno(r, "Cannot resolve user name %s: %m", user);
  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                         return log_error_errno(r, "Failed to drop privileges: %m");
  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                 return log_error_errno(r, "Could not create manager: %m");
  77
  78         r = manager_connect_bus(m);
  79         if (r < 0)
  80                 return log_error_errno(r, "Could not connect to bus: %m");
  81
  82         r = manager_parse_config_file(m);
  83         if (r < 0)
  84                 log_warning_errno(r, "Failed to parse configuration file: %m");
  85
  86         r = manager_load_config(m);
  87         if (r < 0)
  88                 return log_error_errno(r, "Could not load configuration files: %m");
  89
  90         r = manager_rtnl_enumerate_links(m);
  91         if (r < 0)
  92                 return log_error_errno(r, "Could not enumerate links: %m");
  93
  94         r = manager_rtnl_enumerate_addresses(m);
  95         if (r < 0)
  96                 return log_error_errno(r, "Could not enumerate addresses: %m");
  97
  98         r = manager_rtnl_enumerate_routes(m);
  99         if (r < 0)
 100                 return log_error_errno(r, "Could not enumerate routes: %m");
 101
 102         r = manager_rtnl_enumerate_rules(m);
 103         if (r < 0)
 104                 return log_error_errno(r, "Could not enumerate rules: %m");
 105
 106         r = manager_start(m);
 107         if (r < 0)
 108                 return log_error_errno(r, "Could not start manager: %m");
 109
 110         log_info("Enumeration completed");
 111
 112         notify_message = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
 113
 114         r = sd_event_loop(m->event);
 115         if (r < 0)
 116                 return log_error_errno(r, "Event loop failed: %m");
 117
 118         return 0;
 119 }
 120
 121 DEFINE_MAIN_FUNCTION(run);