src/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 General Public License as published by
  10   the Free Software Foundation; either version 2 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   General Public License for more details.
  17
  18   You should have received a copy of the GNU 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_set)
 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         { NULL, }
 420 };