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 "networkd-conf.h"
   8 #include "networkd-manager.h"
   9 #include "signal-util.h"
  10 #include "user-util.h"
  11
  12 int main(int argc, char *argv[]) {
  13         _cleanup_(manager_freep) Manager *m = NULL;
  14         const char *user = "systemd-network";
  15         uid_t uid;
  16         gid_t gid;
  17         int r;
  18
  19         log_set_target(LOG_TARGET_AUTO);
  20         log_parse_environment();
  21         log_open();
  22
  23         umask(0022);
  24
  25         if (argc != 1) {
  26                 log_error("This program takes no arguments.");
  27                 r = -EINVAL;
  28                 goto out;
  29         }
  30
  31         r = get_user_creds(&user, &uid, &gid, NULL, NULL);
  32         if (r < 0) {
  33                 log_error_errno(r, "Cannot resolve user name %s: %m", user);
  34                 goto out;
  35         }
  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                         goto out;
  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                 log_error_errno(r, "Could not create manager: %m");
  76                 goto out;
  77         }
  78
  79         r = manager_connect_bus(m);
  80         if (r < 0) {
  81                 log_error_errno(r, "Could not connect to bus: %m");
  82                 goto out;
  83         }
  84
  85         r = manager_parse_config_file(m);
  86         if (r < 0)
  87                 log_warning_errno(r, "Failed to parse configuration file: %m");
  88
  89         r = manager_load_config(m);
  90         if (r < 0) {
  91                 log_error_errno(r, "Could not load configuration files: %m");
  92                 goto out;
  93         }
  94
  95         r = manager_rtnl_enumerate_links(m);
  96         if (r < 0) {
  97                 log_error_errno(r, "Could not enumerate links: %m");
  98                 goto out;
  99         }
 100
 101         r = manager_rtnl_enumerate_addresses(m);
 102         if (r < 0) {
 103                 log_error_errno(r, "Could not enumerate addresses: %m");
 104                 goto out;
 105         }
 106
 107         r = manager_rtnl_enumerate_routes(m);
 108         if (r < 0) {
 109                 log_error_errno(r, "Could not enumerate routes: %m");
 110                 goto out;
 111         }
 112
 113         r = manager_rtnl_enumerate_rules(m);
 114         if (r < 0) {
 115                 log_error_errno(r, "Could not enumerate rules: %m");
 116                 goto out;
 117         }
 118
 119         r = manager_start(m);
 120         if (r < 0) {
 121                 log_error_errno(r, "Could not start manager: %m");
 122                 goto out;
 123         }
 124
 125         log_info("Enumeration completed");
 126
 127         sd_notify(false,
 128                   "READY=1\n"
 129                   "STATUS=Processing requests...");
 130
 131         r = sd_event_loop(m->event);
 132         if (r < 0) {
 133                 log_error_errno(r, "Event loop failed: %m");
 134                 goto out;
 135         }
 136 out:
 137         sd_notify(false,
 138                   "STOPPING=1\n"
 139                   "STATUS=Shutting down...");
 140
 141         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 142 }