src/network/networkd.c

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