src/core/dbus-service.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "strv.h"
  23 #include "path-util.h"
  24 #include "unit.h"
  25 #include "service.h"
  26 #include "dbus-unit.h"
  27 #include "dbus-execute.h"
  28 #include "dbus-kill.h"
  29 #include "dbus-cgroup.h"
  30 #include "dbus-service.h"
  31 #include "bus-util.h"
  32
  33 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, service_type, ServiceType);
  34 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, service_result, ServiceResult);
  35 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_restart, service_restart, ServiceRestart);
  36 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_notify_access, notify_access, NotifyAccess);
  37 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_failure_action, failure_action, FailureAction);
  38
  39 const sd_bus_vtable bus_service_vtable[] = {
  40         SD_BUS_VTABLE_START(0),
  41         SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Service, type), SD_BUS_VTABLE_PROPERTY_CONST),
  42         SD_BUS_PROPERTY("Restart", "s", property_get_restart, offsetof(Service, restart), SD_BUS_VTABLE_PROPERTY_CONST),
  43         SD_BUS_PROPERTY("PIDFile", "s", NULL, offsetof(Service, pid_file), SD_BUS_VTABLE_PROPERTY_CONST),
  44         SD_BUS_PROPERTY("NotifyAccess", "s", property_get_notify_access, offsetof(Service, notify_access), SD_BUS_VTABLE_PROPERTY_CONST),
  45         SD_BUS_PROPERTY("RestartUSec", "t", bus_property_get_usec, offsetof(Service, restart_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  46         SD_BUS_PROPERTY("TimeoutStartUSec", "t", bus_property_get_usec, offsetof(Service, timeout_start_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  47         SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Service, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  48         SD_BUS_PROPERTY("WatchdogUSec", "t", bus_property_get_usec, offsetof(Service, watchdog_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  49         BUS_PROPERTY_DUAL_TIMESTAMP("WatchdogTimestamp", offsetof(Service, watchdog_timestamp), 0),
  50         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Service, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST),
  51         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Service, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST),
  52         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_failure_action, offsetof(Service, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST),
  53         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Service, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST),
  54         SD_BUS_PROPERTY("FailureAction", "s", property_get_failure_action, offsetof(Service, failure_action), SD_BUS_VTABLE_PROPERTY_CONST),
  55         SD_BUS_PROPERTY("PermissionsStartOnly", "b", bus_property_get_bool, offsetof(Service, permissions_start_only), SD_BUS_VTABLE_PROPERTY_CONST),
  56         SD_BUS_PROPERTY("RootDirectoryStartOnly", "b", bus_property_get_bool, offsetof(Service, root_directory_start_only), SD_BUS_VTABLE_PROPERTY_CONST),
  57         SD_BUS_PROPERTY("RemainAfterExit", "b", bus_property_get_bool, offsetof(Service, remain_after_exit), SD_BUS_VTABLE_PROPERTY_CONST),
  58         SD_BUS_PROPERTY("GuessMainPID", "b", bus_property_get_bool, offsetof(Service, guess_main_pid), SD_BUS_VTABLE_PROPERTY_CONST),
  59         SD_BUS_PROPERTY("MainPID", "u", bus_property_get_pid, offsetof(Service, main_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  60         SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Service, control_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  61         SD_BUS_PROPERTY("BusName", "s", NULL, offsetof(Service, bus_name), SD_BUS_VTABLE_PROPERTY_CONST),
  62         SD_BUS_PROPERTY("StatusText", "s", NULL, offsetof(Service, status_text), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  63         SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Service, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  64         BUS_EXEC_STATUS_VTABLE("ExecMain", offsetof(Service, main_exec_status), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  65         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStartPre", offsetof(Service, exec_command[SERVICE_EXEC_START_PRE]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  66         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStart", offsetof(Service, exec_command[SERVICE_EXEC_START]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  67         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStartPost", offsetof(Service, exec_command[SERVICE_EXEC_START_POST]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  68         BUS_EXEC_COMMAND_LIST_VTABLE("ExecReload", offsetof(Service, exec_command[SERVICE_EXEC_RELOAD]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  69         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStop", offsetof(Service, exec_command[SERVICE_EXEC_STOP]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  70         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStopPost", offsetof(Service, exec_command[SERVICE_EXEC_STOP_POST]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  71         SD_BUS_VTABLE_END
  72 };
  73
  74 static int bus_service_set_transient_property(
  75                 Service *s,
  76                 const char *name,
  77                 sd_bus_message *message,
  78                 UnitSetPropertiesMode mode,
  79                 sd_bus_error *error) {
  80
  81         int r;
  82
  83         assert(s);
  84         assert(name);
  85         assert(message);
  86
  87         if (streq(name, "RemainAfterExit")) {
  88                 int b;
  89
  90                 r = sd_bus_message_read(message, "b", &b);
  91                 if (r < 0)
  92                         return r;
  93
  94                 if (mode != UNIT_CHECK) {
  95                         s->remain_after_exit = b;
  96                         unit_write_drop_in_private_format(UNIT(s), mode, name, "RemainAfterExit=%s\n", yes_no(b));
  97                 }
  98
  99                 return 1;
 100
 101         } else if (streq(name, "Type")) {
 102                 const char *t;
 103                 ServiceType k;
 104
 105                 r = sd_bus_message_read(message, "s", &t);
 106                 if (r < 0)
 107                         return r;
 108
 109                 k = service_type_from_string(t);
 110                 if (k < 0)
 111                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid service type %s", t);
 112
 113                 if (mode != UNIT_CHECK) {
 114                         s->type = k;
 115                         unit_write_drop_in_private_format(UNIT(s), mode, name, "Type=%s\n", service_type_to_string(s->type));
 116                 }
 117
 118                 return 1;
 119
 120         } else if (streq(name, "ExecStart")) {
 121                 unsigned n = 0;
 122
 123                 r = sd_bus_message_enter_container(message, 'a', "(sasb)");
 124                 if (r < 0)
 125                         return r;
 126
 127                 while ((r = sd_bus_message_enter_container(message, 'r', "sasb")) > 0) {
 128                         _cleanup_strv_free_ char **argv = NULL;
 129                         const char *path;
 130                         int b;
 131
 132                         r = sd_bus_message_read(message, "s", &path);
 133                         if (r < 0)
 134                                 return r;
 135
 136                         if (!path_is_absolute(path))
 137                                 return sd_bus_error_set_errnof(error, EINVAL, "Path %s is not absolute.", path);
 138
 139                         r = sd_bus_message_read_strv(message, &argv);
 140                         if (r < 0)
 141                                 return r;
 142
 143                         r = sd_bus_message_read(message, "b", &b);
 144                         if (r < 0)
 145                                 return r;
 146
 147                         r = sd_bus_message_exit_container(message);
 148                         if (r < 0)
 149                                 return r;
 150
 151                         if (mode != UNIT_CHECK) {
 152                                 ExecCommand *c;
 153
 154                                 c = new0(ExecCommand, 1);
 155                                 if (!c)
 156                                         return -ENOMEM;
 157
 158                                 c->path = strdup(path);
 159                                 if (!c->path) {
 160                                         free(c);
 161                                         return -ENOMEM;
 162                                 }
 163
 164                                 c->argv = argv;
 165                                 argv = NULL;
 166
 167                                 c->ignore = b;
 168
 169                                 path_kill_slashes(c->path);
 170                                 exec_command_append_list(&s->exec_command[SERVICE_EXEC_START], c);
 171                         }
 172
 173                         n++;
 174                 }
 175
 176                 if (r < 0)
 177                         return r;
 178
 179                 r = sd_bus_message_exit_container(message);
 180                 if (r < 0)
 181                         return r;
 182
 183                 if (mode != UNIT_CHECK) {
 184                         _cleanup_free_ char *buf = NULL;
 185                         _cleanup_fclose_ FILE *f = NULL;
 186                         ExecCommand *c;
 187                         size_t size = 0;
 188
 189                         if (n == 0) {
 190                                 exec_command_free_list(s->exec_command[SERVICE_EXEC_START]);
 191                                 s->exec_command[SERVICE_EXEC_START] = NULL;
 192                         }
 193
 194                         f = open_memstream(&buf, &size);
 195                         if (!f)
 196                                 return -ENOMEM;
 197
 198                         fputs("ExecStart=\n", f);
 199
 200                         LIST_FOREACH(command, c, s->exec_command[SERVICE_EXEC_START]) {
 201                                 _cleanup_free_ char *a;
 202
 203                                 a = strv_join_quoted(c->argv);
 204                                 if (!a)
 205                                         return -ENOMEM;
 206
 207                                 fprintf(f, "ExecStart=%s@%s %s\n",
 208                                         c->ignore ? "-" : "",
 209                                         c->path,
 210                                         a);
 211                         }
 212
 213                         fflush(f);
 214                         unit_write_drop_in_private(UNIT(s), mode, name, buf);
 215                 }
 216
 217                 return 1;
 218         }
 219
 220         return 0;
 221 }
 222
 223 int bus_service_set_property(
 224                 Unit *u,
 225                 const char *name,
 226                 sd_bus_message *message,
 227                 UnitSetPropertiesMode mode,
 228                 sd_bus_error *error) {
 229
 230         Service *s = SERVICE(u);
 231         int r;
 232
 233         assert(s);
 234         assert(name);
 235         assert(message);
 236
 237         r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, mode, error);
 238         if (r != 0)
 239                 return r;
 240
 241         if (u->transient && u->load_state == UNIT_STUB) {
 242                 /* This is a transient unit, let's load a little more */
 243
 244                 r = bus_service_set_transient_property(s, name, message, mode, error);
 245                 if (r != 0)
 246                         return r;
 247
 248                 r = bus_exec_context_set_transient_property(u, &s->exec_context, name, message, mode, error);
 249                 if (r != 0)
 250                         return r;
 251
 252                 r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, mode, error);
 253                 if (r != 0)
 254                         return r;
 255         }
 256
 257         return 0;
 258 }
 259
 260 int bus_service_commit_properties(Unit *u) {
 261         assert(u);
 262
 263         unit_update_cgroup_members_masks(u);
 264         unit_realize_cgroup(u);
 265
 266         return 0;
 267 }