src/core/dbus-execute.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 <errno.h>
  23 #include <dbus/dbus.h>
  24 #include <sys/prctl.h>
  25
  26 #include "dbus-execute.h"
  27 #include "missing.h"
  28 #include "ioprio.h"
  29 #include "strv.h"
  30 #include "dbus-common.h"
  31
  32 DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_execute_append_kill_mode, kill_mode, KillMode);
  33
  34 DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_execute_append_input, exec_input, ExecInput);
  35 DEFINE_BUS_PROPERTY_APPEND_ENUM(bus_execute_append_output, exec_output, ExecOutput);
  36
  37 int bus_execute_append_env_files(DBusMessageIter *i, const char *property, void *data) {
  38         char **env_files = data, **j;
  39         DBusMessageIter sub, sub2;
  40
  41         assert(i);
  42         assert(property);
  43
  44         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(sb)", &sub))
  45                 return -ENOMEM;
  46
  47         STRV_FOREACH(j, env_files) {
  48                 dbus_bool_t b = false;
  49                 char *fn = *j;
  50
  51                 if (fn[0] == '-') {
  52                         b = true;
  53                         fn++;
  54                 }
  55
  56                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
  57                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &fn) ||
  58                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_BOOLEAN, &b) ||
  59                     !dbus_message_iter_close_container(&sub, &sub2))
  60                         return -ENOMEM;
  61         }
  62
  63         if (!dbus_message_iter_close_container(i, &sub))
  64                 return -ENOMEM;
  65
  66         return 0;
  67 }
  68
  69 int bus_execute_append_oom_score_adjust(DBusMessageIter *i, const char *property, void *data) {
  70         ExecContext *c = data;
  71         int32_t n;
  72
  73         assert(i);
  74         assert(property);
  75         assert(c);
  76
  77         if (c->oom_score_adjust_set)
  78                 n = c->oom_score_adjust;
  79         else {
  80                 char *t;
  81
  82                 n = 0;
  83                 if (read_one_line_file("/proc/self/oom_score_adj", &t) >= 0) {
  84                         safe_atoi(t, &n);
  85                         free(t);
  86                 } else if (read_one_line_file("/proc/self/oom_adj", &t) >= 0) {
  87                         safe_atoi(t, &n);
  88                         free(t);
  89
  90                         if (n == OOM_ADJUST_MAX)
  91                                 n = OOM_SCORE_ADJ_MAX;
  92                         else
  93                                 n = (n * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
  94                 }
  95         }
  96
  97         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &n))
  98                 return -ENOMEM;
  99
 100         return 0;
 101 }
 102
 103 int bus_execute_append_nice(DBusMessageIter *i, const char *property, void *data) {
 104         ExecContext *c = data;
 105         int32_t n;
 106
 107         assert(i);
 108         assert(property);
 109         assert(c);
 110
 111         if (c->nice_set)
 112                 n = c->nice;
 113         else
 114                 n = getpriority(PRIO_PROCESS, 0);
 115
 116         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &n))
 117                 return -ENOMEM;
 118
 119         return 0;
 120 }
 121
 122 int bus_execute_append_ioprio(DBusMessageIter *i, const char *property, void *data) {
 123         ExecContext *c = data;
 124         int32_t n;
 125
 126         assert(i);
 127         assert(property);
 128         assert(c);
 129
 130         if (c->ioprio_set)
 131                 n = c->ioprio;
 132         else
 133                 n = ioprio_get(IOPRIO_WHO_PROCESS, 0);
 134
 135         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &n))
 136                 return -ENOMEM;
 137
 138         return 0;
 139 }
 140
 141 int bus_execute_append_cpu_sched_policy(DBusMessageIter *i, const char *property, void *data) {
 142         ExecContext *c = data;
 143         int32_t n;
 144
 145         assert(i);
 146         assert(property);
 147         assert(c);
 148
 149         if (c->cpu_sched_set)
 150                 n = c->cpu_sched_policy;
 151         else
 152                 n = sched_getscheduler(0);
 153
 154         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &n))
 155                 return -ENOMEM;
 156
 157         return 0;
 158 }
 159
 160 int bus_execute_append_cpu_sched_priority(DBusMessageIter *i, const char *property, void *data) {
 161         ExecContext *c = data;
 162         int32_t n;
 163
 164         assert(i);
 165         assert(property);
 166         assert(c);
 167
 168         if (c->cpu_sched_set)
 169                 n = c->cpu_sched_priority;
 170         else {
 171                 struct sched_param p;
 172                 n = 0;
 173
 174                 zero(p);
 175                 if (sched_getparam(0, &p) >= 0)
 176                         n = p.sched_priority;
 177         }
 178
 179         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_INT32, &n))
 180                 return -ENOMEM;
 181
 182         return 0;
 183 }
 184
 185 int bus_execute_append_affinity(DBusMessageIter *i, const char *property, void *data) {
 186         ExecContext *c = data;
 187         dbus_bool_t b;
 188         DBusMessageIter sub;
 189
 190         assert(i);
 191         assert(property);
 192         assert(c);
 193
 194         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "y", &sub))
 195                 return -ENOMEM;
 196
 197         if (c->cpuset)
 198                 b = dbus_message_iter_append_fixed_array(&sub, DBUS_TYPE_BYTE, &c->cpuset, CPU_ALLOC_SIZE(c->cpuset_ncpus));
 199         else
 200                 b = dbus_message_iter_append_fixed_array(&sub, DBUS_TYPE_BYTE, &c->cpuset, 0);
 201
 202         if (!b)
 203                 return -ENOMEM;
 204
 205         if (!dbus_message_iter_close_container(i, &sub))
 206                 return -ENOMEM;
 207
 208         return 0;
 209 }
 210
 211 int bus_execute_append_timer_slack_nsec(DBusMessageIter *i, const char *property, void *data) {
 212         ExecContext *c = data;
 213         uint64_t u;
 214
 215         assert(i);
 216         assert(property);
 217         assert(c);
 218
 219         if (c->timer_slack_nsec != (nsec_t) -1)
 220                 u = (uint64_t) c->timer_slack_nsec;
 221         else
 222                 u = (uint64_t) prctl(PR_GET_TIMERSLACK);
 223
 224         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 225                 return -ENOMEM;
 226
 227         return 0;
 228 }
 229
 230 int bus_execute_append_capability_bs(DBusMessageIter *i, const char *property, void *data) {
 231         ExecContext *c = data;
 232         uint64_t normal, inverted;
 233
 234         assert(i);
 235         assert(property);
 236         assert(c);
 237
 238         /* We store this negated internally, to match the kernel, but
 239          * we expose it normalized. */
 240
 241         normal = *(uint64_t*) data;
 242         inverted = ~normal;
 243
 244         return bus_property_append_uint64(i, property, &inverted);
 245 }
 246
 247 int bus_execute_append_capabilities(DBusMessageIter *i, const char *property, void *data) {
 248         ExecContext *c = data;
 249         char *t = NULL;
 250         const char *s;
 251         dbus_bool_t b;
 252
 253         assert(i);
 254         assert(property);
 255         assert(c);
 256
 257         if (c->capabilities)
 258                 s = t = cap_to_text(c->capabilities, NULL);
 259         else
 260                 s = "";
 261
 262         if (!s)
 263                 return -ENOMEM;
 264
 265         b = dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &s);
 266
 267         if (t)
 268                 cap_free(t);
 269
 270         if (!b)
 271                 return -ENOMEM;
 272
 273         return 0;
 274 }
 275
 276 int bus_execute_append_rlimits(DBusMessageIter *i, const char *property, void *data) {
 277         ExecContext *c = data;
 278         int r;
 279         uint64_t u;
 280
 281         assert(i);
 282         assert(property);
 283         assert(c);
 284
 285         assert_se((r = rlimit_from_string(property)) >= 0);
 286
 287         if (c->rlimit[r])
 288                 u = (uint64_t) c->rlimit[r]->rlim_max;
 289         else {
 290                 struct rlimit rl;
 291
 292                 zero(rl);
 293                 getrlimit(r, &rl);
 294
 295                 u = (uint64_t) rl.rlim_max;
 296         }
 297
 298         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 299                 return -ENOMEM;
 300
 301         return 0;
 302 }
 303
 304 int bus_execute_append_command(DBusMessageIter *i, const char *property, void *data) {
 305         ExecCommand *c = data;
 306         DBusMessageIter sub, sub2, sub3;
 307
 308         assert(i);
 309         assert(property);
 310
 311         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(sasbttttuii)", &sub))
 312                 return -ENOMEM;
 313
 314         LIST_FOREACH(command, c, c) {
 315                 char **l;
 316                 uint32_t pid;
 317                 int32_t code, status;
 318                 dbus_bool_t b;
 319
 320                 if (!c->path)
 321                         continue;
 322
 323                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2) ||
 324                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &c->path) ||
 325                     !dbus_message_iter_open_container(&sub2, DBUS_TYPE_ARRAY, "s", &sub3))
 326                         return -ENOMEM;
 327
 328                 STRV_FOREACH(l, c->argv)
 329                         if (!dbus_message_iter_append_basic(&sub3, DBUS_TYPE_STRING, l))
 330                                 return -ENOMEM;
 331
 332                 pid = (uint32_t) c->exec_status.pid;
 333                 code = (int32_t) c->exec_status.code;
 334                 status = (int32_t) c->exec_status.status;
 335
 336                 b = !!c->ignore;
 337
 338                 if (!dbus_message_iter_close_container(&sub2, &sub3) ||
 339                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_BOOLEAN, &b) ||
 340                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT64, &c->exec_status.start_timestamp.realtime) ||
 341                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT64, &c->exec_status.start_timestamp.monotonic) ||
 342                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT64, &c->exec_status.exit_timestamp.realtime) ||
 343                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT64, &c->exec_status.exit_timestamp.monotonic) ||
 344                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &pid) ||
 345                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_INT32, &code) ||
 346                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_INT32, &status))
 347                         return -ENOMEM;
 348
 349                 if (!dbus_message_iter_close_container(&sub, &sub2))
 350                         return -ENOMEM;
 351         }
 352
 353         if (!dbus_message_iter_close_container(i, &sub))
 354                 return -ENOMEM;
 355
 356         return 0;
 357 }
 358
 359 const BusProperty bus_exec_context_properties[] = {
 360         { "Environment",              bus_property_append_strv,             "as", offsetof(ExecContext, environment),            true },
 361         { "EnvironmentFiles",         bus_execute_append_env_files,      "a(sb)", offsetof(ExecContext, environment_files),      true },
 362         { "UMask",                    bus_property_append_mode,              "u", offsetof(ExecContext, umask)                        },
 363         { "LimitCPU",                 bus_execute_append_rlimits,            "t", 0 },
 364         { "LimitFSIZE",               bus_execute_append_rlimits,            "t", 0 },
 365         { "LimitDATA",                bus_execute_append_rlimits,            "t", 0 },
 366         { "LimitSTACK",               bus_execute_append_rlimits,            "t", 0 },
 367         { "LimitCORE",                bus_execute_append_rlimits,            "t", 0 },
 368         { "LimitRSS",                 bus_execute_append_rlimits,            "t", 0 },
 369         { "LimitNOFILE",              bus_execute_append_rlimits,            "t", 0 },
 370         { "LimitAS",                  bus_execute_append_rlimits,            "t", 0 },
 371         { "LimitNPROC",               bus_execute_append_rlimits,            "t", 0 },
 372         { "LimitMEMLOCK",             bus_execute_append_rlimits,            "t", 0 },
 373         { "LimitLOCKS",               bus_execute_append_rlimits,            "t", 0 },
 374         { "LimitSIGPENDING",          bus_execute_append_rlimits,            "t", 0 },
 375         { "LimitMSGQUEUE",            bus_execute_append_rlimits,            "t", 0 },
 376         { "LimitNICE",                bus_execute_append_rlimits,            "t", 0 },
 377         { "LimitRTPRIO",              bus_execute_append_rlimits,            "t", 0 },
 378         { "LimitRTTIME",              bus_execute_append_rlimits,            "t", 0 },
 379         { "WorkingDirectory",         bus_property_append_string,            "s", offsetof(ExecContext, working_directory),      true },
 380         { "RootDirectory",            bus_property_append_string,            "s", offsetof(ExecContext, root_directory),         true },
 381         { "OOMScoreAdjust",           bus_execute_append_oom_score_adjust,   "i", 0 },
 382         { "Nice",                     bus_execute_append_nice,               "i", 0 },
 383         { "IOScheduling",             bus_execute_append_ioprio,             "i", 0 },
 384         { "CPUSchedulingPolicy",      bus_execute_append_cpu_sched_policy,   "i", 0 },
 385         { "CPUSchedulingPriority",    bus_execute_append_cpu_sched_priority, "i", 0 },
 386         { "CPUAffinity",              bus_execute_append_affinity,          "ay", 0 },
 387         { "TimerSlackNSec",           bus_execute_append_timer_slack_nsec,   "t", 0 },
 388         { "CPUSchedulingResetOnFork", bus_property_append_bool,              "b", offsetof(ExecContext, cpu_sched_reset_on_fork)      },
 389         { "NonBlocking",              bus_property_append_bool,              "b", offsetof(ExecContext, non_blocking)                 },
 390         { "StandardInput",            bus_execute_append_input,              "s", offsetof(ExecContext, std_input)                    },
 391         { "StandardOutput",           bus_execute_append_output,             "s", offsetof(ExecContext, std_output)                   },
 392         { "StandardError",            bus_execute_append_output,             "s", offsetof(ExecContext, std_error)                    },
 393         { "TTYPath",                  bus_property_append_string,            "s", offsetof(ExecContext, tty_path),               true },
 394         { "TTYReset",                 bus_property_append_bool,              "b", offsetof(ExecContext, tty_reset)                    },
 395         { "TTYVHangup",               bus_property_append_bool,              "b", offsetof(ExecContext, tty_vhangup)                  },
 396         { "TTYVTDisallocate",         bus_property_append_bool,              "b", offsetof(ExecContext, tty_vt_disallocate)           },
 397         { "SyslogPriority",           bus_property_append_int,               "i", offsetof(ExecContext, syslog_priority)              },
 398         { "SyslogIdentifier",         bus_property_append_string,            "s", offsetof(ExecContext, syslog_identifier),      true },
 399         { "SyslogLevelPrefix",        bus_property_append_bool,              "b", offsetof(ExecContext, syslog_level_prefix)          },
 400         { "Capabilities",             bus_execute_append_capabilities,       "s", 0 },
 401         { "SecureBits",               bus_property_append_int,               "i", offsetof(ExecContext, secure_bits)                  },
 402         { "CapabilityBoundingSet",    bus_execute_append_capability_bs,      "t", offsetof(ExecContext, capability_bounding_set_drop) },
 403         { "User",                     bus_property_append_string,            "s", offsetof(ExecContext, user),                   true },
 404         { "Group",                    bus_property_append_string,            "s", offsetof(ExecContext, group),                  true },
 405         { "SupplementaryGroups",      bus_property_append_strv,             "as", offsetof(ExecContext, supplementary_groups),   true },
 406         { "TCPWrapName",              bus_property_append_string,            "s", offsetof(ExecContext, tcpwrap_name),           true },
 407         { "PAMName",                  bus_property_append_string,            "s", offsetof(ExecContext, pam_name),               true },
 408         { "ReadWriteDirectories",     bus_property_append_strv,             "as", offsetof(ExecContext, read_write_dirs),        true },
 409         { "ReadOnlyDirectories",      bus_property_append_strv,             "as", offsetof(ExecContext, read_only_dirs),         true },
 410         { "InaccessibleDirectories",  bus_property_append_strv,             "as", offsetof(ExecContext, inaccessible_dirs),      true },
 411         { "MountFlags",               bus_property_append_ul,                "t", offsetof(ExecContext, mount_flags)                  },
 412         { "PrivateTmp",               bus_property_append_bool,              "b", offsetof(ExecContext, private_tmp)                  },
 413         { "PrivateNetwork",           bus_property_append_bool,              "b", offsetof(ExecContext, private_network)              },
 414         { "SameProcessGroup",         bus_property_append_bool,              "b", offsetof(ExecContext, same_pgrp)                    },
 415         { "KillMode",                 bus_execute_append_kill_mode,          "s", offsetof(ExecContext, kill_mode)                    },
 416         { "KillSignal",               bus_property_append_int,               "i", offsetof(ExecContext, kill_signal)                  },
 417         { "UtmpIdentifier",           bus_property_append_string,            "s", offsetof(ExecContext, utmp_id),                true },
 418         { "ControlGroupModify",       bus_property_append_bool,              "b", offsetof(ExecContext, control_group_modify)         },
 419         { "ControlGroupPersistent",   bus_property_append_tristate_false,    "b", offsetof(ExecContext, control_group_persistent)     },
 420         { "IgnoreSIGPIPE",            bus_property_append_bool,              "b", offsetof(ExecContext, ignore_sigpipe          )     },
 421         { NULL, }
 422 };