src/core/dbus-service.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include "alloc-util.h"
  21 #include "async.h"
  22 #include "bus-util.h"
  23 #include "dbus-cgroup.h"
  24 #include "dbus-execute.h"
  25 #include "dbus-kill.h"
  26 #include "dbus-service.h"
  27 #include "fd-util.h"
  28 #include "fileio.h"
  29 #include "path-util.h"
  30 #include "service.h"
  31 #include "string-util.h"
  32 #include "strv.h"
  33 #include "unit.h"
  34
  35 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, service_type, ServiceType);
  36 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, service_result, ServiceResult);
  37 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_restart, service_restart, ServiceRestart);
  38 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_notify_access, notify_access, NotifyAccess);
  39 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_failure_action, failure_action, FailureAction);
  40
  41 const sd_bus_vtable bus_service_vtable[] = {
  42         SD_BUS_VTABLE_START(0),
  43         SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Service, type), SD_BUS_VTABLE_PROPERTY_CONST),
  44         SD_BUS_PROPERTY("Restart", "s", property_get_restart, offsetof(Service, restart), SD_BUS_VTABLE_PROPERTY_CONST),
  45         SD_BUS_PROPERTY("PIDFile", "s", NULL, offsetof(Service, pid_file), SD_BUS_VTABLE_PROPERTY_CONST),
  46         SD_BUS_PROPERTY("NotifyAccess", "s", property_get_notify_access, offsetof(Service, notify_access), SD_BUS_VTABLE_PROPERTY_CONST),
  47         SD_BUS_PROPERTY("RestartUSec", "t", bus_property_get_usec, offsetof(Service, restart_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  48         SD_BUS_PROPERTY("TimeoutStartUSec", "t", bus_property_get_usec, offsetof(Service, timeout_start_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  49         SD_BUS_PROPERTY("TimeoutStopUSec", "t", bus_property_get_usec, offsetof(Service, timeout_stop_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  50         SD_BUS_PROPERTY("RuntimeMaxUSec", "t", bus_property_get_usec, offsetof(Service, runtime_max_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  51         SD_BUS_PROPERTY("WatchdogUSec", "t", bus_property_get_usec, offsetof(Service, watchdog_usec), SD_BUS_VTABLE_PROPERTY_CONST),
  52         BUS_PROPERTY_DUAL_TIMESTAMP("WatchdogTimestamp", offsetof(Service, watchdog_timestamp), 0),
  53         /* The following four are obsolete, and thus marked hidden here. They moved into the Unit interface */
  54         SD_BUS_PROPERTY("StartLimitInterval", "t", bus_property_get_usec, offsetof(Unit, start_limit.interval), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
  55         SD_BUS_PROPERTY("StartLimitBurst", "u", bus_property_get_unsigned, offsetof(Unit, start_limit.burst), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
  56         SD_BUS_PROPERTY("StartLimitAction", "s", property_get_failure_action, offsetof(Unit, start_limit_action), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
  57         SD_BUS_PROPERTY("RebootArgument", "s", NULL, offsetof(Unit, reboot_arg), SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_HIDDEN),
  58         SD_BUS_PROPERTY("FailureAction", "s", property_get_failure_action, offsetof(Service, failure_action), SD_BUS_VTABLE_PROPERTY_CONST),
  59         SD_BUS_PROPERTY("PermissionsStartOnly", "b", bus_property_get_bool, offsetof(Service, permissions_start_only), SD_BUS_VTABLE_PROPERTY_CONST),
  60         SD_BUS_PROPERTY("RootDirectoryStartOnly", "b", bus_property_get_bool, offsetof(Service, root_directory_start_only), SD_BUS_VTABLE_PROPERTY_CONST),
  61         SD_BUS_PROPERTY("RemainAfterExit", "b", bus_property_get_bool, offsetof(Service, remain_after_exit), SD_BUS_VTABLE_PROPERTY_CONST),
  62         SD_BUS_PROPERTY("GuessMainPID", "b", bus_property_get_bool, offsetof(Service, guess_main_pid), SD_BUS_VTABLE_PROPERTY_CONST),
  63         SD_BUS_PROPERTY("MainPID", "u", bus_property_get_pid, offsetof(Service, main_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  64         SD_BUS_PROPERTY("ControlPID", "u", bus_property_get_pid, offsetof(Service, control_pid), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  65         SD_BUS_PROPERTY("BusName", "s", NULL, offsetof(Service, bus_name), SD_BUS_VTABLE_PROPERTY_CONST),
  66         SD_BUS_PROPERTY("FileDescriptorStoreMax", "u", bus_property_get_unsigned, offsetof(Service, n_fd_store_max), SD_BUS_VTABLE_PROPERTY_CONST),
  67         SD_BUS_PROPERTY("NFileDescriptorStore", "u", bus_property_get_unsigned, offsetof(Service, n_fd_store), 0),
  68         SD_BUS_PROPERTY("StatusText", "s", NULL, offsetof(Service, status_text), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  69         SD_BUS_PROPERTY("StatusErrno", "i", NULL, offsetof(Service, status_errno), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  70         SD_BUS_PROPERTY("Result", "s", property_get_result, offsetof(Service, result), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  71         SD_BUS_PROPERTY("USBFunctionDescriptors", "s", NULL, offsetof(Service, usb_function_descriptors), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  72         SD_BUS_PROPERTY("USBFunctionStrings", "s", NULL, offsetof(Service, usb_function_strings), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  73         BUS_EXEC_STATUS_VTABLE("ExecMain", offsetof(Service, main_exec_status), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
  74         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStartPre", offsetof(Service, exec_command[SERVICE_EXEC_START_PRE]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  75         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStart", offsetof(Service, exec_command[SERVICE_EXEC_START]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  76         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStartPost", offsetof(Service, exec_command[SERVICE_EXEC_START_POST]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  77         BUS_EXEC_COMMAND_LIST_VTABLE("ExecReload", offsetof(Service, exec_command[SERVICE_EXEC_RELOAD]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  78         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStop", offsetof(Service, exec_command[SERVICE_EXEC_STOP]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  79         BUS_EXEC_COMMAND_LIST_VTABLE("ExecStopPost", offsetof(Service, exec_command[SERVICE_EXEC_STOP_POST]), SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION),
  80         SD_BUS_VTABLE_END
  81 };
  82
  83 static int bus_service_set_transient_property(
  84                 Service *s,
  85                 const char *name,
  86                 sd_bus_message *message,
  87                 UnitSetPropertiesMode mode,
  88                 sd_bus_error *error) {
  89
  90         int r;
  91
  92         assert(s);
  93         assert(name);
  94         assert(message);
  95
  96         if (streq(name, "RemainAfterExit")) {
  97                 int b;
  98
  99                 r = sd_bus_message_read(message, "b", &b);
 100                 if (r < 0)
 101                         return r;
 102
 103                 if (mode != UNIT_CHECK) {
 104                         s->remain_after_exit = b;
 105                         unit_write_drop_in_private_format(UNIT(s), mode, name, "RemainAfterExit=%s\n", yes_no(b));
 106                 }
 107
 108                 return 1;
 109
 110         } else if (streq(name, "Type")) {
 111                 const char *t;
 112                 ServiceType k;
 113
 114                 r = sd_bus_message_read(message, "s", &t);
 115                 if (r < 0)
 116                         return r;
 117
 118                 k = service_type_from_string(t);
 119                 if (k < 0)
 120                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid service type %s", t);
 121
 122                 if (mode != UNIT_CHECK) {
 123                         s->type = k;
 124                         unit_write_drop_in_private_format(UNIT(s), mode, name, "Type=%s\n", service_type_to_string(s->type));
 125                 }
 126
 127                 return 1;
 128         } else if (streq(name, "RuntimeMaxUSec")) {
 129                 usec_t u;
 130
 131                 r = sd_bus_message_read(message, "t", &u);
 132                 if (r < 0)
 133                         return r;
 134
 135                 if (mode != UNIT_CHECK) {
 136                         s->runtime_max_usec = u;
 137                         unit_write_drop_in_private_format(UNIT(s), mode, name, "RuntimeMaxSec=" USEC_FMT "us\n", u);
 138                 }
 139
 140                 return 1;
 141
 142         } else if (STR_IN_SET(name,
 143                               "StandardInputFileDescriptor",
 144                               "StandardOutputFileDescriptor",
 145                               "StandardErrorFileDescriptor")) {
 146                 int fd;
 147
 148                 r = sd_bus_message_read(message, "h", &fd);
 149                 if (r < 0)
 150                         return r;
 151
 152                 if (mode != UNIT_CHECK) {
 153                         int copy;
 154
 155                         copy = fcntl(fd, F_DUPFD_CLOEXEC, 3);
 156                         if (copy < 0)
 157                                 return -errno;
 158
 159                         if (streq(name, "StandardInputFileDescriptor")) {
 160                                 asynchronous_close(s->stdin_fd);
 161                                 s->stdin_fd = copy;
 162                         } else if (streq(name, "StandardOutputFileDescriptor")) {
 163                                 asynchronous_close(s->stdout_fd);
 164                                 s->stdout_fd = copy;
 165                         } else {
 166                                 asynchronous_close(s->stderr_fd);
 167                                 s->stderr_fd = copy;
 168                         }
 169
 170                         s->exec_context.stdio_as_fds = true;
 171                 }
 172
 173                 return 1;
 174
 175         } else if (streq(name, "ExecStart")) {
 176                 unsigned n = 0;
 177
 178                 r = sd_bus_message_enter_container(message, 'a', "(sasb)");
 179                 if (r < 0)
 180                         return r;
 181
 182                 while ((r = sd_bus_message_enter_container(message, 'r', "sasb")) > 0) {
 183                         _cleanup_strv_free_ char **argv = NULL;
 184                         const char *path;
 185                         int b;
 186
 187                         r = sd_bus_message_read(message, "s", &path);
 188                         if (r < 0)
 189                                 return r;
 190
 191                         if (!path_is_absolute(path))
 192                                 return sd_bus_error_set_errnof(error, EINVAL, "Path %s is not absolute.", path);
 193
 194                         r = sd_bus_message_read_strv(message, &argv);
 195                         if (r < 0)
 196                                 return r;
 197
 198                         r = sd_bus_message_read(message, "b", &b);
 199                         if (r < 0)
 200                                 return r;
 201
 202                         r = sd_bus_message_exit_container(message);
 203                         if (r < 0)
 204                                 return r;
 205
 206                         if (mode != UNIT_CHECK) {
 207                                 ExecCommand *c;
 208
 209                                 c = new0(ExecCommand, 1);
 210                                 if (!c)
 211                                         return -ENOMEM;
 212
 213                                 c->path = strdup(path);
 214                                 if (!c->path) {
 215                                         free(c);
 216                                         return -ENOMEM;
 217                                 }
 218
 219                                 c->argv = argv;
 220                                 argv = NULL;
 221
 222                                 c->ignore = b;
 223
 224                                 path_kill_slashes(c->path);
 225                                 exec_command_append_list(&s->exec_command[SERVICE_EXEC_START], c);
 226                         }
 227
 228                         n++;
 229                 }
 230
 231                 if (r < 0)
 232                         return r;
 233
 234                 r = sd_bus_message_exit_container(message);
 235                 if (r < 0)
 236                         return r;
 237
 238                 if (mode != UNIT_CHECK) {
 239                         _cleanup_free_ char *buf = NULL;
 240                         _cleanup_fclose_ FILE *f = NULL;
 241                         ExecCommand *c;
 242                         size_t size = 0;
 243
 244                         if (n == 0)
 245                                 s->exec_command[SERVICE_EXEC_START] = exec_command_free_list(s->exec_command[SERVICE_EXEC_START]);
 246
 247                         f = open_memstream(&buf, &size);
 248                         if (!f)
 249                                 return -ENOMEM;
 250
 251                         fputs("ExecStart=\n", f);
 252
 253                         LIST_FOREACH(command, c, s->exec_command[SERVICE_EXEC_START]) {
 254                                 _cleanup_free_ char *a;
 255
 256                                 a = strv_join_quoted(c->argv);
 257                                 if (!a)
 258                                         return -ENOMEM;
 259
 260                                 fprintf(f, "ExecStart=%s@%s %s\n",
 261                                         c->ignore ? "-" : "",
 262                                         c->path,
 263                                         a);
 264                         }
 265
 266                         r = fflush_and_check(f);
 267                         if (r < 0)
 268                                 return r;
 269                         unit_write_drop_in_private(UNIT(s), mode, name, buf);
 270                 }
 271
 272                 return 1;
 273         }
 274
 275         return 0;
 276 }
 277
 278 int bus_service_set_property(
 279                 Unit *u,
 280                 const char *name,
 281                 sd_bus_message *message,
 282                 UnitSetPropertiesMode mode,
 283                 sd_bus_error *error) {
 284
 285         Service *s = SERVICE(u);
 286         int r;
 287
 288         assert(s);
 289         assert(name);
 290         assert(message);
 291
 292         r = bus_cgroup_set_property(u, &s->cgroup_context, name, message, mode, error);
 293         if (r != 0)
 294                 return r;
 295
 296         if (u->transient && u->load_state == UNIT_STUB) {
 297                 /* This is a transient unit, let's load a little more */
 298
 299                 r = bus_service_set_transient_property(s, name, message, mode, error);
 300                 if (r != 0)
 301                         return r;
 302
 303                 r = bus_exec_context_set_transient_property(u, &s->exec_context, name, message, mode, error);
 304                 if (r != 0)
 305                         return r;
 306
 307                 r = bus_kill_context_set_transient_property(u, &s->kill_context, name, message, mode, error);
 308                 if (r != 0)
 309                         return r;
 310         }
 311
 312         return 0;
 313 }
 314
 315 int bus_service_commit_properties(Unit *u) {
 316         assert(u);
 317
 318         unit_update_cgroup_members_masks(u);
 319         unit_realize_cgroup(u);
 320
 321         return 0;
 322 }