src/load-fragment.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 <linux/oom.h>
  23 #include <assert.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sched.h>
  29 #include <sys/prctl.h>
  30 #include <sys/mount.h>
  31 #include <linux/fs.h>
  32
  33 #include "unit.h"
  34 #include "strv.h"
  35 #include "conf-parser.h"
  36 #include "load-fragment.h"
  37 #include "log.h"
  38 #include "ioprio.h"
  39 #include "securebits.h"
  40 #include "missing.h"
  41 #include "unit-name.h"
  42
  43 #define DEFINE_CONFIG_PARSE_ENUM(function,name,type,msg)                \
  44         static int function(                                            \
  45                         const char *filename,                           \
  46                         unsigned line,                                  \
  47                         const char *section,                            \
  48                         const char *lvalue,                             \
  49                         const char *rvalue,                             \
  50                         void *data,                                     \
  51                         void *userdata) {                               \
  52                                                                         \
  53                 type *i = data, x;                                      \
  54                                                                         \
  55                 assert(filename);                                       \
  56                 assert(lvalue);                                         \
  57                 assert(rvalue);                                         \
  58                 assert(data);                                           \
  59                                                                         \
  60                 if ((x = name##_from_string(rvalue)) < 0) {             \
  61                         log_error("[%s:%u] " msg ": %s", filename, line, rvalue); \
  62                         return -EBADMSG;                                \
  63                 }                                                       \
  64                                                                         \
  65                 *i = x;                                                 \
  66                                                                         \
  67                 return 0;                                               \
  68         }
  69
  70 static int config_parse_deps(
  71                 const char *filename,
  72                 unsigned line,
  73                 const char *section,
  74                 const char *lvalue,
  75                 const char *rvalue,
  76                 void *data,
  77                 void *userdata) {
  78
  79         UnitDependency d = PTR_TO_UINT(data);
  80         Unit *u = userdata;
  81         char *w;
  82         size_t l;
  83         char *state;
  84
  85         assert(filename);
  86         assert(lvalue);
  87         assert(rvalue);
  88
  89         FOREACH_WORD(w, l, rvalue, state) {
  90                 char *t, *k;
  91                 int r;
  92
  93                 if (!(t = strndup(w, l)))
  94                         return -ENOMEM;
  95
  96                 k = unit_name_printf(u, t);
  97                 free(t);
  98
  99                 if (!k)
 100                         return -ENOMEM;
 101
 102                 r = unit_add_dependency_by_name(u, d, k, NULL, true);
 103                 free(k);
 104
 105                 if (r < 0)
 106                         return r;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static int config_parse_names(
 113                 const char *filename,
 114                 unsigned line,
 115                 const char *section,
 116                 const char *lvalue,
 117                 const char *rvalue,
 118                 void *data,
 119                 void *userdata) {
 120
 121         Unit *u = userdata;
 122         char *w;
 123         size_t l;
 124         char *state;
 125
 126         assert(filename);
 127         assert(lvalue);
 128         assert(rvalue);
 129         assert(data);
 130
 131         FOREACH_WORD(w, l, rvalue, state) {
 132                 char *t, *k;
 133                 int r;
 134
 135                 if (!(t = strndup(w, l)))
 136                         return -ENOMEM;
 137
 138                 k = unit_name_printf(u, t);
 139                 free(t);
 140
 141                 if (!k)
 142                         return -ENOMEM;
 143
 144                 r = unit_merge_by_name(u, k);
 145                 free(k);
 146
 147                 if (r < 0)
 148                         return r;
 149         }
 150
 151         return 0;
 152 }
 153
 154 static int config_parse_description(
 155                 const char *filename,
 156                 unsigned line,
 157                 const char *section,
 158                 const char *lvalue,
 159                 const char *rvalue,
 160                 void *data,
 161                 void *userdata) {
 162
 163         Unit *u = userdata;
 164         char *k;
 165
 166         assert(filename);
 167         assert(lvalue);
 168         assert(rvalue);
 169         assert(data);
 170
 171         if (!(k = unit_full_printf(u, rvalue)))
 172                 return -ENOMEM;
 173
 174         free(u->meta.description);
 175
 176         if (*k)
 177                 u->meta.description = k;
 178         else {
 179                 free(k);
 180                 u->meta.description = NULL;
 181         }
 182
 183         return 0;
 184 }
 185
 186 static int config_parse_listen(
 187                 const char *filename,
 188                 unsigned line,
 189                 const char *section,
 190                 const char *lvalue,
 191                 const char *rvalue,
 192                 void *data,
 193                 void *userdata) {
 194
 195         int r;
 196         SocketPort *p;
 197         Socket *s;
 198
 199         assert(filename);
 200         assert(lvalue);
 201         assert(rvalue);
 202         assert(data);
 203
 204         s = (Socket*) data;
 205
 206         if (!(p = new0(SocketPort, 1)))
 207                 return -ENOMEM;
 208
 209         if (streq(lvalue, "ListenFIFO")) {
 210                 p->type = SOCKET_FIFO;
 211
 212                 if (!(p->path = strdup(rvalue))) {
 213                         free(p);
 214                         return -ENOMEM;
 215                 }
 216
 217                 path_kill_slashes(p->path);
 218         } else {
 219                 p->type = SOCKET_SOCKET;
 220
 221                 if ((r = socket_address_parse(&p->address, rvalue)) < 0) {
 222                         log_error("[%s:%u] Failed to parse address value: %s", filename, line, rvalue);
 223                         free(p);
 224                         return r;
 225                 }
 226
 227                 if (streq(lvalue, "ListenStream"))
 228                         p->address.type = SOCK_STREAM;
 229                 else if (streq(lvalue, "ListenDatagram"))
 230                         p->address.type = SOCK_DGRAM;
 231                 else {
 232                         assert(streq(lvalue, "ListenSequentialPacket"));
 233                         p->address.type = SOCK_SEQPACKET;
 234                 }
 235
 236                 if (socket_address_family(&p->address) != AF_LOCAL && p->address.type == SOCK_SEQPACKET) {
 237                         free(p);
 238                         return -EPROTONOSUPPORT;
 239                 }
 240         }
 241
 242         p->fd = -1;
 243         LIST_PREPEND(SocketPort, port, s->ports, p);
 244
 245         return 0;
 246 }
 247
 248 static int config_parse_socket_bind(
 249                 const char *filename,
 250                 unsigned line,
 251                 const char *section,
 252                 const char *lvalue,
 253                 const char *rvalue,
 254                 void *data,
 255                 void *userdata) {
 256
 257         Socket *s;
 258         SocketAddressBindIPv6Only b;
 259
 260         assert(filename);
 261         assert(lvalue);
 262         assert(rvalue);
 263         assert(data);
 264
 265         s = (Socket*) data;
 266
 267         if ((b = socket_address_bind_ipv6_only_from_string(rvalue)) < 0) {
 268                 int r;
 269
 270                 if ((r = parse_boolean(rvalue)) < 0) {
 271                         log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 272                         return -EBADMSG;
 273                 }
 274
 275                 s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 276         } else
 277                 s->bind_ipv6_only = b;
 278
 279         return 0;
 280 }
 281
 282 static int config_parse_nice(
 283                 const char *filename,
 284                 unsigned line,
 285                 const char *section,
 286                 const char *lvalue,
 287                 const char *rvalue,
 288                 void *data,
 289                 void *userdata) {
 290
 291         ExecContext *c = data;
 292         int priority, r;
 293
 294         assert(filename);
 295         assert(lvalue);
 296         assert(rvalue);
 297         assert(data);
 298
 299         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 300                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 301                 return r;
 302         }
 303
 304         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 305                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 306                 return -ERANGE;
 307         }
 308
 309         c->nice = priority;
 310         c->nice_set = false;
 311
 312         return 0;
 313 }
 314
 315 static int config_parse_oom_adjust(
 316                 const char *filename,
 317                 unsigned line,
 318                 const char *section,
 319                 const char *lvalue,
 320                 const char *rvalue,
 321                 void *data,
 322                 void *userdata) {
 323
 324         ExecContext *c = data;
 325         int oa, r;
 326
 327         assert(filename);
 328         assert(lvalue);
 329         assert(rvalue);
 330         assert(data);
 331
 332         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 333                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 334                 return r;
 335         }
 336
 337         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 338                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 339                 return -ERANGE;
 340         }
 341
 342         c->oom_adjust = oa;
 343         c->oom_adjust_set = true;
 344
 345         return 0;
 346 }
 347
 348 static int config_parse_mode(
 349                 const char *filename,
 350                 unsigned line,
 351                 const char *section,
 352                 const char *lvalue,
 353                 const char *rvalue,
 354                 void *data,
 355                 void *userdata) {
 356
 357         mode_t *m = data;
 358         long l;
 359         char *x = NULL;
 360
 361         assert(filename);
 362         assert(lvalue);
 363         assert(rvalue);
 364         assert(data);
 365
 366         errno = 0;
 367         l = strtol(rvalue, &x, 8);
 368         if (!x || *x || errno) {
 369                 log_error("[%s:%u] Failed to parse mode value: %s", filename, line, rvalue);
 370                 return errno ? -errno : -EINVAL;
 371         }
 372
 373         if (l < 0000 || l > 07777) {
 374                 log_error("[%s:%u] mode value out of range: %s", filename, line, rvalue);
 375                 return -ERANGE;
 376         }
 377
 378         *m = (mode_t) l;
 379         return 0;
 380 }
 381
 382 static int config_parse_exec(
 383                 const char *filename,
 384                 unsigned line,
 385                 const char *section,
 386                 const char *lvalue,
 387                 const char *rvalue,
 388                 void *data,
 389                 void *userdata) {
 390
 391         ExecCommand **e = data, *nce = NULL;
 392         char **n;
 393         char *w;
 394         unsigned k;
 395         size_t l;
 396         char *state, *path = NULL;
 397         bool honour_argv0, write_to_path;
 398
 399         assert(filename);
 400         assert(lvalue);
 401         assert(rvalue);
 402         assert(data);
 403
 404         /* We accept an absolute path as first argument, or
 405          * alternatively an absolute prefixed with @ to allow
 406          * overriding of argv[0]. */
 407
 408         honour_argv0 = rvalue[0] == '@';
 409
 410         if (rvalue[honour_argv0 ? 1 : 0] != '/') {
 411                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 412                 return -EINVAL;
 413         }
 414
 415         k = 0;
 416         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 417                 k++;
 418
 419         if (!(n = new(char*, k + (honour_argv0 ? 0 : 1))))
 420                 return -ENOMEM;
 421
 422         k = 0;
 423         write_to_path = honour_argv0;
 424         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 425                 if (write_to_path) {
 426                         if (!(path = strndup(w+1, l-1)))
 427                                 goto fail;
 428                         write_to_path = false;
 429                 } else {
 430                         if (!(n[k++] = strndup(w, l)))
 431                                 goto fail;
 432                 }
 433         }
 434
 435         n[k] = NULL;
 436
 437         if (!n[0]) {
 438                 log_error("[%s:%u] Invalid command line: %s", filename, line, rvalue);
 439                 strv_free(n);
 440                 return -EINVAL;
 441         }
 442
 443         if (!path)
 444                 if (!(path = strdup(n[0])))
 445                         goto fail;
 446
 447         assert(path_is_absolute(path));
 448
 449         if (!(nce = new0(ExecCommand, 1)))
 450                 goto fail;
 451
 452         nce->argv = n;
 453         nce->path = path;
 454
 455         path_kill_slashes(nce->path);
 456
 457         exec_command_append_list(e, nce);
 458
 459         return 0;
 460
 461 fail:
 462         n[k] = NULL;
 463         strv_free(n);
 464         free(path);
 465         free(nce);
 466
 467         return -ENOMEM;
 468 }
 469
 470 static int config_parse_usec(
 471                 const char *filename,
 472                 unsigned line,
 473                 const char *section,
 474                 const char *lvalue,
 475                 const char *rvalue,
 476                 void *data,
 477                 void *userdata) {
 478
 479         usec_t *usec = data;
 480         int r;
 481
 482         assert(filename);
 483         assert(lvalue);
 484         assert(rvalue);
 485         assert(data);
 486
 487         if ((r = parse_usec(rvalue, usec)) < 0) {
 488                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 489                 return r;
 490         }
 491
 492         return 0;
 493 }
 494
 495 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_type, service_type, ServiceType, "Failed to parse service type");
 496 DEFINE_CONFIG_PARSE_ENUM(config_parse_service_restart, service_restart, ServiceRestart, "Failed to parse service restart specifier");
 497
 498 static int config_parse_bindtodevice(
 499                 const char *filename,
 500                 unsigned line,
 501                 const char *section,
 502                 const char *lvalue,
 503                 const char *rvalue,
 504                 void *data,
 505                 void *userdata) {
 506
 507         Socket *s = data;
 508         char *n;
 509
 510         assert(filename);
 511         assert(lvalue);
 512         assert(rvalue);
 513         assert(data);
 514
 515         if (rvalue[0] && !streq(rvalue, "*")) {
 516                 if (!(n = strdup(rvalue)))
 517                         return -ENOMEM;
 518         } else
 519                 n = NULL;
 520
 521         free(s->bind_to_device);
 522         s->bind_to_device = n;
 523
 524         return 0;
 525 }
 526
 527 DEFINE_CONFIG_PARSE_ENUM(config_parse_output, exec_output, ExecOutput, "Failed to parse output specifier");
 528 DEFINE_CONFIG_PARSE_ENUM(config_parse_input, exec_input, ExecInput, "Failed to parse input specifier");
 529
 530 static int config_parse_facility(
 531                 const char *filename,
 532                 unsigned line,
 533                 const char *section,
 534                 const char *lvalue,
 535                 const char *rvalue,
 536                 void *data,
 537                 void *userdata) {
 538
 539
 540         int *o = data, x;
 541
 542         assert(filename);
 543         assert(lvalue);
 544         assert(rvalue);
 545         assert(data);
 546
 547         if ((x = log_facility_from_string(rvalue)) < 0) {
 548                 log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 549                 return -EBADMSG;
 550         }
 551
 552         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 553
 554         return 0;
 555 }
 556
 557 static int config_parse_level(
 558                 const char *filename,
 559                 unsigned line,
 560                 const char *section,
 561                 const char *lvalue,
 562                 const char *rvalue,
 563                 void *data,
 564                 void *userdata) {
 565
 566
 567         int *o = data, x;
 568
 569         assert(filename);
 570         assert(lvalue);
 571         assert(rvalue);
 572         assert(data);
 573
 574         if ((x = log_level_from_string(rvalue)) < 0) {
 575                 log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 576                 return -EBADMSG;
 577         }
 578
 579         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 580         return 0;
 581 }
 582
 583 static int config_parse_io_class(
 584                 const char *filename,
 585                 unsigned line,
 586                 const char *section,
 587                 const char *lvalue,
 588                 const char *rvalue,
 589                 void *data,
 590                 void *userdata) {
 591
 592         ExecContext *c = data;
 593         int x;
 594
 595         assert(filename);
 596         assert(lvalue);
 597         assert(rvalue);
 598         assert(data);
 599
 600         if ((x = ioprio_class_from_string(rvalue)) < 0) {
 601                 log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 602                 return -EBADMSG;
 603         }
 604
 605         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 606         c->ioprio_set = true;
 607
 608         return 0;
 609 }
 610
 611 static int config_parse_io_priority(
 612                 const char *filename,
 613                 unsigned line,
 614                 const char *section,
 615                 const char *lvalue,
 616                 const char *rvalue,
 617                 void *data,
 618                 void *userdata) {
 619
 620         ExecContext *c = data;
 621         int i;
 622
 623         assert(filename);
 624         assert(lvalue);
 625         assert(rvalue);
 626         assert(data);
 627
 628         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 629                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 630                 return -EBADMSG;
 631         }
 632
 633         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 634         c->ioprio_set = true;
 635
 636         return 0;
 637 }
 638
 639 static int config_parse_cpu_sched_policy(
 640                 const char *filename,
 641                 unsigned line,
 642                 const char *section,
 643                 const char *lvalue,
 644                 const char *rvalue,
 645                 void *data,
 646                 void *userdata) {
 647
 648
 649         ExecContext *c = data;
 650         int x;
 651
 652         assert(filename);
 653         assert(lvalue);
 654         assert(rvalue);
 655         assert(data);
 656
 657         if ((x = sched_policy_from_string(rvalue)) < 0) {
 658                 log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 659                 return -EBADMSG;
 660         }
 661
 662         c->cpu_sched_policy = x;
 663         c->cpu_sched_set = true;
 664
 665         return 0;
 666 }
 667
 668 static int config_parse_cpu_sched_prio(
 669                 const char *filename,
 670                 unsigned line,
 671                 const char *section,
 672                 const char *lvalue,
 673                 const char *rvalue,
 674                 void *data,
 675                 void *userdata) {
 676
 677         ExecContext *c = data;
 678         int i;
 679
 680         assert(filename);
 681         assert(lvalue);
 682         assert(rvalue);
 683         assert(data);
 684
 685         /* On Linux RR/FIFO have the same range */
 686         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 687                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 688                 return -EBADMSG;
 689         }
 690
 691         c->cpu_sched_priority = i;
 692         c->cpu_sched_set = true;
 693
 694         return 0;
 695 }
 696
 697 static int config_parse_cpu_affinity(
 698                 const char *filename,
 699                 unsigned line,
 700                 const char *section,
 701                 const char *lvalue,
 702                 const char *rvalue,
 703                 void *data,
 704                 void *userdata) {
 705
 706         ExecContext *c = data;
 707         char *w;
 708         size_t l;
 709         char *state;
 710
 711         assert(filename);
 712         assert(lvalue);
 713         assert(rvalue);
 714         assert(data);
 715
 716         FOREACH_WORD(w, l, rvalue, state) {
 717                 char *t;
 718                 int r;
 719                 unsigned cpu;
 720
 721                 if (!(t = strndup(w, l)))
 722                         return -ENOMEM;
 723
 724                 r = safe_atou(t, &cpu);
 725                 free(t);
 726
 727                 if (r < 0 || cpu >= CPU_SETSIZE) {
 728                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 729                         return -EBADMSG;
 730                 }
 731
 732                 CPU_SET(cpu, &c->cpu_affinity);
 733         }
 734
 735         c->cpu_affinity_set = true;
 736
 737         return 0;
 738 }
 739
 740 static int config_parse_capabilities(
 741                 const char *filename,
 742                 unsigned line,
 743                 const char *section,
 744                 const char *lvalue,
 745                 const char *rvalue,
 746                 void *data,
 747                 void *userdata) {
 748
 749         ExecContext *c = data;
 750         cap_t cap;
 751
 752         assert(filename);
 753         assert(lvalue);
 754         assert(rvalue);
 755         assert(data);
 756
 757         if (!(cap = cap_from_text(rvalue))) {
 758                 if (errno == ENOMEM)
 759                         return -ENOMEM;
 760
 761                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 762                 return -EBADMSG;
 763         }
 764
 765         if (c->capabilities)
 766                 cap_free(c->capabilities);
 767         c->capabilities = cap;
 768
 769         return 0;
 770 }
 771
 772 static int config_parse_secure_bits(
 773                 const char *filename,
 774                 unsigned line,
 775                 const char *section,
 776                 const char *lvalue,
 777                 const char *rvalue,
 778                 void *data,
 779                 void *userdata) {
 780
 781         ExecContext *c = data;
 782         char *w;
 783         size_t l;
 784         char *state;
 785
 786         assert(filename);
 787         assert(lvalue);
 788         assert(rvalue);
 789         assert(data);
 790
 791         FOREACH_WORD(w, l, rvalue, state) {
 792                 if (first_word(w, "keep-caps"))
 793                         c->secure_bits |= SECURE_KEEP_CAPS;
 794                 else if (first_word(w, "keep-caps-locked"))
 795                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 796                 else if (first_word(w, "no-setuid-fixup"))
 797                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 798                 else if (first_word(w, "no-setuid-fixup-locked"))
 799                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 800                 else if (first_word(w, "noroot"))
 801                         c->secure_bits |= SECURE_NOROOT;
 802                 else if (first_word(w, "noroot-locked"))
 803                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 804                 else {
 805                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 806                         return -EBADMSG;
 807                 }
 808         }
 809
 810         return 0;
 811 }
 812
 813 static int config_parse_bounding_set(
 814                 const char *filename,
 815                 unsigned line,
 816                 const char *section,
 817                 const char *lvalue,
 818                 const char *rvalue,
 819                 void *data,
 820                 void *userdata) {
 821
 822         ExecContext *c = data;
 823         char *w;
 824         size_t l;
 825         char *state;
 826
 827         assert(filename);
 828         assert(lvalue);
 829         assert(rvalue);
 830         assert(data);
 831
 832         FOREACH_WORD(w, l, rvalue, state) {
 833                 char *t;
 834                 int r;
 835                 cap_value_t cap;
 836
 837                 if (!(t = strndup(w, l)))
 838                         return -ENOMEM;
 839
 840                 r = cap_from_name(t, &cap);
 841                 free(t);
 842
 843                 if (r < 0) {
 844                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 845                         return -EBADMSG;
 846                 }
 847
 848                 c->capability_bounding_set_drop |= 1 << cap;
 849         }
 850
 851         return 0;
 852 }
 853
 854 static int config_parse_timer_slack_ns(
 855                 const char *filename,
 856                 unsigned line,
 857                 const char *section,
 858                 const char *lvalue,
 859                 const char *rvalue,
 860                 void *data,
 861                 void *userdata) {
 862
 863         ExecContext *c = data;
 864         unsigned long u;
 865         int r;
 866
 867         assert(filename);
 868         assert(lvalue);
 869         assert(rvalue);
 870         assert(data);
 871
 872         if ((r = safe_atolu(rvalue, &u)) < 0) {
 873                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 874                 return r;
 875         }
 876
 877         c->timer_slack_ns = u;
 878
 879         return 0;
 880 }
 881
 882 static int config_parse_limit(
 883                 const char *filename,
 884                 unsigned line,
 885                 const char *section,
 886                 const char *lvalue,
 887                 const char *rvalue,
 888                 void *data,
 889                 void *userdata) {
 890
 891         struct rlimit **rl = data;
 892         unsigned long long u;
 893         int r;
 894
 895         assert(filename);
 896         assert(lvalue);
 897         assert(rvalue);
 898         assert(data);
 899
 900         if ((r = safe_atollu(rvalue, &u)) < 0) {
 901                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 902                 return r;
 903         }
 904
 905         if (!*rl)
 906                 if (!(*rl = new(struct rlimit, 1)))
 907                         return -ENOMEM;
 908
 909         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 910         return 0;
 911 }
 912
 913 static int config_parse_cgroup(
 914                 const char *filename,
 915                 unsigned line,
 916                 const char *section,
 917                 const char *lvalue,
 918                 const char *rvalue,
 919                 void *data,
 920                 void *userdata) {
 921
 922         Unit *u = userdata;
 923         char *w;
 924         size_t l;
 925         char *state;
 926
 927         FOREACH_WORD(w, l, rvalue, state) {
 928                 char *t;
 929                 int r;
 930
 931                 if (!(t = strndup(w, l)))
 932                         return -ENOMEM;
 933
 934                 r = unit_add_cgroup_from_text(u, t);
 935                 free(t);
 936
 937                 if (r < 0)
 938                         return r;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int config_parse_sysv_priority(
 945                 const char *filename,
 946                 unsigned line,
 947                 const char *section,
 948                 const char *lvalue,
 949                 const char *rvalue,
 950                 void *data,
 951                 void *userdata) {
 952
 953         int *priority = data;
 954         int r, i;
 955
 956         assert(filename);
 957         assert(lvalue);
 958         assert(rvalue);
 959         assert(data);
 960
 961         if ((r = safe_atoi(rvalue, &i)) < 0 || i < 0) {
 962                 log_error("[%s:%u] Failed to parse SysV start priority: %s", filename, line, rvalue);
 963                 return r;
 964         }
 965
 966         *priority = (int) i;
 967         return 0;
 968 }
 969
 970 DEFINE_CONFIG_PARSE_ENUM(config_parse_kill_mode, kill_mode, KillMode, "Failed to parse kill mode");
 971
 972 static int config_parse_mount_flags(
 973                 const char *filename,
 974                 unsigned line,
 975                 const char *section,
 976                 const char *lvalue,
 977                 const char *rvalue,
 978                 void *data,
 979                 void *userdata) {
 980
 981         ExecContext *c = data;
 982         char *w;
 983         size_t l;
 984         char *state;
 985         unsigned long flags = 0;
 986
 987         assert(filename);
 988         assert(lvalue);
 989         assert(rvalue);
 990         assert(data);
 991
 992         FOREACH_WORD(w, l, rvalue, state) {
 993                 if (strncmp(w, "shared", l) == 0)
 994                         flags |= MS_SHARED;
 995                 else if (strncmp(w, "slave", l) == 0)
 996                         flags |= MS_SLAVE;
 997                 else if (strncmp(w, "private", l) == 0)
 998                         flags |= MS_PRIVATE;
 999                 else {
1000                         log_error("[%s:%u] Failed to parse mount flags: %s", filename, line, rvalue);
1001                         return -EINVAL;
1002                 }
1003         }
1004
1005         c->mount_flags = flags;
1006         return 0;
1007 }
1008
1009 static int config_parse_timer(
1010                 const char *filename,
1011                 unsigned line,
1012                 const char *section,
1013                 const char *lvalue,
1014                 const char *rvalue,
1015                 void *data,
1016                 void *userdata) {
1017
1018         Timer *t = data;
1019         usec_t u;
1020         int r;
1021         TimerValue *v;
1022         TimerBase b;
1023
1024         assert(filename);
1025         assert(lvalue);
1026         assert(rvalue);
1027         assert(data);
1028
1029         if ((b = timer_base_from_string(lvalue)) < 0) {
1030                 log_error("[%s:%u] Failed to parse timer base: %s", filename, line, lvalue);
1031                 return -EINVAL;
1032         }
1033
1034         if ((r = parse_usec(rvalue, &u)) < 0) {
1035                 log_error("[%s:%u] Failed to parse timer value: %s", filename, line, rvalue);
1036                 return r;
1037         }
1038
1039         if (!(v = new0(TimerValue, 1)))
1040                 return -ENOMEM;
1041
1042         v->base = b;
1043         v->value = u;
1044
1045         LIST_PREPEND(TimerValue, value, t->values, v);
1046
1047         return 0;
1048 }
1049
1050 static int config_parse_timer_unit(
1051                 const char *filename,
1052                 unsigned line,
1053                 const char *section,
1054                 const char *lvalue,
1055                 const char *rvalue,
1056                 void *data,
1057                 void *userdata) {
1058
1059         Timer *t = data;
1060         int r;
1061
1062         if (endswith(rvalue, ".timer")) {
1063                 log_error("[%s:%u] Unit cannot be of type timer: %s", filename, line, rvalue);
1064                 return -EINVAL;
1065         }
1066
1067         if ((r = manager_load_unit(t->meta.manager, rvalue, NULL, &t->unit)) < 0) {
1068                 log_error("[%s:%u] Failed to load unit: %s", filename, line, rvalue);
1069                 return r;
1070         }
1071
1072         return 0;
1073 }
1074
1075 static int config_parse_path_spec(
1076                 const char *filename,
1077                 unsigned line,
1078                 const char *section,
1079                 const char *lvalue,
1080                 const char *rvalue,
1081                 void *data,
1082                 void *userdata) {
1083
1084         Path *p = data;
1085         PathSpec *s;
1086         PathType b;
1087
1088         assert(filename);
1089         assert(lvalue);
1090         assert(rvalue);
1091         assert(data);
1092
1093         if ((b = path_type_from_string(lvalue)) < 0) {
1094                 log_error("[%s:%u] Failed to parse path type: %s", filename, line, lvalue);
1095                 return -EINVAL;
1096         }
1097
1098         if (!path_is_absolute(rvalue)) {
1099                 log_error("[%s:%u] Path is not absolute: %s", filename, line, rvalue);
1100                 return -EINVAL;
1101         }
1102
1103         if (!(s = new0(PathSpec, 1)))
1104                 return -ENOMEM;
1105
1106         if (!(s->path = strdup(rvalue))) {
1107                 free(s);
1108                 return -ENOMEM;
1109         }
1110
1111         path_kill_slashes(s->path);
1112
1113         s->type = b;
1114         s->inotify_fd = -1;
1115
1116         LIST_PREPEND(PathSpec, spec, p->specs, s);
1117
1118         return 0;
1119 }
1120
1121 static int config_parse_path_unit(
1122                 const char *filename,
1123                 unsigned line,
1124                 const char *section,
1125                 const char *lvalue,
1126                 const char *rvalue,
1127                 void *data,
1128                 void *userdata) {
1129
1130         Path *t = data;
1131         int r;
1132
1133         if (endswith(rvalue, ".path")) {
1134                 log_error("[%s:%u] Unit cannot be of type path: %s", filename, line, rvalue);
1135                 return -EINVAL;
1136         }
1137
1138         if ((r = manager_load_unit(t->meta.manager, rvalue, NULL, &t->unit)) < 0) {
1139                 log_error("[%s:%u] Failed to load unit: %s", filename, line, rvalue);
1140                 return r;
1141         }
1142
1143         return 0;
1144 }
1145
1146 #define FOLLOW_MAX 8
1147
1148 static int open_follow(char **filename, FILE **_f, Set *names, char **_final) {
1149         unsigned c = 0;
1150         int fd, r;
1151         FILE *f;
1152         char *id = NULL;
1153
1154         assert(filename);
1155         assert(*filename);
1156         assert(_f);
1157         assert(names);
1158
1159         /* This will update the filename pointer if the loaded file is
1160          * reached by a symlink. The old string will be freed. */
1161
1162         for (;;) {
1163                 char *target, *name;
1164
1165                 if (c++ >= FOLLOW_MAX)
1166                         return -ELOOP;
1167
1168                 path_kill_slashes(*filename);
1169
1170                 /* Add the file name we are currently looking at to
1171                  * the names of this unit */
1172                 name = file_name_from_path(*filename);
1173                 if (!(id = set_get(names, name))) {
1174
1175                         if (!(id = strdup(name)))
1176                                 return -ENOMEM;
1177
1178                         if ((r = set_put(names, id)) < 0) {
1179                                 free(id);
1180                                 return r;
1181                         }
1182                 }
1183
1184                 /* Try to open the file name, but don't if its a symlink */
1185                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
1186                         break;
1187
1188                 if (errno != ELOOP)
1189                         return -errno;
1190
1191                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
1192                 if ((r = readlink_and_make_absolute(*filename, &target)) < 0)
1193                         return r;
1194
1195                 free(*filename);
1196                 *filename = target;
1197         }
1198
1199         if (!(f = fdopen(fd, "r"))) {
1200                 r = -errno;
1201                 close_nointr_nofail(fd);
1202                 return r;
1203         }
1204
1205         *_f = f;
1206         *_final = id;
1207         return 0;
1208 }
1209
1210 static int merge_by_names(Unit **u, Set *names, const char *id) {
1211         char *k;
1212         int r;
1213
1214         assert(u);
1215         assert(*u);
1216         assert(names);
1217
1218         /* Let's try to add in all symlink names we found */
1219         while ((k = set_steal_first(names))) {
1220
1221                 /* First try to merge in the other name into our
1222                  * unit */
1223                 if ((r = unit_merge_by_name(*u, k)) < 0) {
1224                         Unit *other;
1225
1226                         /* Hmm, we couldn't merge the other unit into
1227                          * ours? Then let's try it the other way
1228                          * round */
1229
1230                         other = manager_get_unit((*u)->meta.manager, k);
1231                         free(k);
1232
1233                         if (other)
1234                                 if ((r = unit_merge(other, *u)) >= 0) {
1235                                         *u = other;
1236                                         return merge_by_names(u, names, NULL);
1237                                 }
1238
1239                         return r;
1240                 }
1241
1242                 if (id == k)
1243                         unit_choose_id(*u, id);
1244
1245                 free(k);
1246         }
1247
1248         return 0;
1249 }
1250
1251 static void dump_items(FILE *f, const ConfigItem *items) {
1252         const ConfigItem *i;
1253         const char *prev_section = NULL;
1254         bool not_first = false;
1255
1256         struct {
1257                 ConfigParserCallback callback;
1258                 const char *rvalue;
1259         } table[] = {
1260                 { config_parse_int,              "INTEGER" },
1261                 { config_parse_unsigned,         "UNSIGNED" },
1262                 { config_parse_size,             "SIZE" },
1263                 { config_parse_bool,             "BOOLEAN" },
1264                 { config_parse_string,           "STRING" },
1265                 { config_parse_path,             "PATH" },
1266                 { config_parse_strv,             "STRING [...]" },
1267                 { config_parse_nice,             "NICE" },
1268                 { config_parse_oom_adjust,       "OOMADJUST" },
1269                 { config_parse_io_class,         "IOCLASS" },
1270                 { config_parse_io_priority,      "IOPRIORITY" },
1271                 { config_parse_cpu_sched_policy, "CPUSCHEDPOLICY" },
1272                 { config_parse_cpu_sched_prio,   "CPUSCHEDPRIO" },
1273                 { config_parse_cpu_affinity,     "CPUAFFINITY" },
1274                 { config_parse_mode,             "MODE" },
1275                 { config_parse_output,           "OUTPUT" },
1276                 { config_parse_input,            "INPUT" },
1277                 { config_parse_facility,         "FACILITY" },
1278                 { config_parse_level,            "LEVEL" },
1279                 { config_parse_capabilities,     "CAPABILITIES" },
1280                 { config_parse_secure_bits,      "SECUREBITS" },
1281                 { config_parse_bounding_set,     "BOUNDINGSET" },
1282                 { config_parse_timer_slack_ns,   "TIMERSLACK" },
1283                 { config_parse_limit,            "LIMIT" },
1284                 { config_parse_cgroup,           "CGROUP [...]" },
1285                 { config_parse_deps,             "UNIT [...]" },
1286                 { config_parse_names,            "UNIT [...]" },
1287                 { config_parse_exec,             "PATH [ARGUMENT [...]]" },
1288                 { config_parse_service_type,     "SERVICETYPE" },
1289                 { config_parse_service_restart,  "SERVICERESTART" },
1290                 { config_parse_sysv_priority,    "SYSVPRIORITY" },
1291                 { config_parse_kill_mode,        "KILLMODE" },
1292                 { config_parse_listen,           "SOCKET [...]" },
1293                 { config_parse_socket_bind,      "SOCKETBIND" },
1294                 { config_parse_bindtodevice,     "NETWORKINTERFACE" },
1295                 { config_parse_usec,             "SECONDS" },
1296                 { config_parse_path_strv,        "PATH [...]" },
1297                 { config_parse_mount_flags,      "MOUNTFLAG [...]" },
1298                 { config_parse_description,      "DESCRIPTION" },
1299                 { config_parse_timer,            "TIMER" },
1300                 { config_parse_timer_unit,       "NAME" },
1301         };
1302
1303         assert(f);
1304         assert(items);
1305
1306         for (i = items; i->lvalue; i++) {
1307                 unsigned j;
1308                 const char *rvalue = "OTHER";
1309
1310                 if (!streq_ptr(i->section, prev_section)) {
1311                         if (!not_first)
1312                                 not_first = true;
1313                         else
1314                                 fputc('\n', f);
1315
1316                         fprintf(f, "[%s]\n", i->section);
1317                         prev_section = i->section;
1318                 }
1319
1320                 for (j = 0; j < ELEMENTSOF(table); j++)
1321                         if (i->parse == table[j].callback) {
1322                                 rvalue = table[j].rvalue;
1323                                 break;
1324                         }
1325
1326                 fprintf(f, "%s=%s\n", i->lvalue, rvalue);
1327         }
1328 }
1329
1330 static int load_from_path(Unit *u, const char *path) {
1331
1332         static const char* const section_table[_UNIT_TYPE_MAX] = {
1333                 [UNIT_SERVICE]   = "Service",
1334                 [UNIT_TIMER]     = "Timer",
1335                 [UNIT_SOCKET]    = "Socket",
1336                 [UNIT_TARGET]    = "Target",
1337                 [UNIT_DEVICE]    = "Device",
1338                 [UNIT_MOUNT]     = "Mount",
1339                 [UNIT_AUTOMOUNT] = "Automount",
1340                 [UNIT_SNAPSHOT]  = "Snapshot",
1341                 [UNIT_SWAP]      = "Swap",
1342                 [UNIT_PATH]      = "Path"
1343         };
1344
1345 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1346                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1347                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1348                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1349                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1350                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1351                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1352                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1353                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1354                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1355                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1356                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1357                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1358                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1359                 { "UMask",                  config_parse_mode,            &(context).umask,                                section   }, \
1360                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1361                 { "StandardInput",          config_parse_input,           &(context).std_input,                            section   }, \
1362                 { "StandardOutput",         config_parse_output,          &(context).std_output,                           section   }, \
1363                 { "StandardError",          config_parse_output,          &(context).std_error,                            section   }, \
1364                 { "TTYPath",                config_parse_path,            &(context).tty_path,                             section   }, \
1365                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1366                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1367                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1368                 { "SyslogNoPrefix",         config_parse_bool,            &(context).syslog_no_prefix,                     section   }, \
1369                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1370                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1371                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1372                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1373                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1374                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1375                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1376                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1377                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1378                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1379                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1380                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1381                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1382                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1383                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1384                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1385                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1386                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1387                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1388                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }, \
1389                 { "ControlGroup",           config_parse_cgroup,          u,                                               section   }, \
1390                 { "ReadWriteDirectories",   config_parse_path_strv,       &(context).read_write_dirs,                      section   }, \
1391                 { "ReadOnlyDirectories",    config_parse_path_strv,       &(context).read_only_dirs,                       section   }, \
1392                 { "InaccessibleDirectories",config_parse_path_strv,       &(context).inaccessible_dirs,                    section   }, \
1393                 { "PrivateTmp",             config_parse_bool,            &(context).private_tmp,                          section   }, \
1394                 { "MountFlags",             config_parse_mount_flags,     &(context),                                      section   }
1395
1396         const ConfigItem items[] = {
1397                 { "Names",                  config_parse_names,           u,                                               "Unit"    },
1398                 { "Description",            config_parse_description,     u,                                               "Unit"    },
1399                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Unit"    },
1400                 { "RequiresOverridable",    config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES_OVERRIDABLE),          "Unit"    },
1401                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Unit"    },
1402                 { "RequisiteOverridable",   config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE_OVERRIDABLE),         "Unit"    },
1403                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Unit"    },
1404                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Unit"    },
1405                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Unit"    },
1406                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Unit"    },
1407                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Unit"    },
1408                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Unit"    },
1409                 { "OnlyByDependency",       config_parse_bool,            &u->meta.only_by_dependency,                     "Unit"    },
1410
1411                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                            "Service" },
1412                 { "ExecStartPre",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_PRE,  "Service" },
1413                 { "ExecStart",              config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START,      "Service" },
1414                 { "ExecStartPost",          config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_POST, "Service" },
1415                 { "ExecReload",             config_parse_exec,            u->service.exec_command+SERVICE_EXEC_RELOAD,     "Service" },
1416                 { "ExecStop",               config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP,       "Service" },
1417                 { "ExecStopPost",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP_POST,  "Service" },
1418                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                        "Service" },
1419                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                        "Service" },
1420                 { "Type",                   config_parse_service_type,    &u->service.type,                                "Service" },
1421                 { "Restart",                config_parse_service_restart, &u->service.restart,                             "Service" },
1422                 { "PermissionsStartOnly",   config_parse_bool,            &u->service.permissions_start_only,              "Service" },
1423                 { "RootDirectoryStartOnly", config_parse_bool,            &u->service.root_directory_start_only,           "Service" },
1424                 { "ValidNoProcess",         config_parse_bool,            &u->service.valid_no_process,                    "Service" },
1425                 { "SysVStartPriority",      config_parse_sysv_priority,   &u->service.sysv_start_priority,                 "Service" },
1426                 { "KillMode",               config_parse_kill_mode,       &u->service.kill_mode,                           "Service" },
1427                 { "NonBlocking",            config_parse_bool,            &u->service.exec_context.non_blocking,           "Service" },
1428                 { "BusName",                config_parse_string,          &u->service.bus_name,                            "Service" },
1429                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1430
1431                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1432                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1433                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1434                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1435                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1436                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1437                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1438                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1439                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1440                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1441                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1442                 { "TimeoutSec",             config_parse_usec,            &u->socket.timeout_usec,                         "Socket"  },
1443                 { "DirectoryMode",          config_parse_mode,            &u->socket.directory_mode,                       "Socket"  },
1444                 { "SocketMode",             config_parse_mode,            &u->socket.socket_mode,                          "Socket"  },
1445                 { "KillMode",               config_parse_kill_mode,       &u->socket.kill_mode,                            "Socket"  },
1446                 { "Accept",                 config_parse_bool,            &u->socket.accept,                               "Socket"  },
1447                 { "TCPWrapName",            config_parse_string,          &u->socket.tcpwrap_name,                         "Socket"  },
1448                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1449
1450                 { "What",                   config_parse_string,          &u->mount.parameters_fragment.what,              "Mount"   },
1451                 { "Where",                  config_parse_path,            &u->mount.where,                                 "Mount"   },
1452                 { "Options",                config_parse_string,          &u->mount.parameters_fragment.options,           "Mount"   },
1453                 { "Type",                   config_parse_string,          &u->mount.parameters_fragment.fstype,            "Mount"   },
1454                 { "TimeoutSec",             config_parse_usec,            &u->mount.timeout_usec,                          "Mount"   },
1455                 { "KillMode",               config_parse_kill_mode,       &u->mount.kill_mode,                             "Mount"   },
1456                 EXEC_CONTEXT_CONFIG_ITEMS(u->mount.exec_context, "Mount"),
1457
1458                 { "Where",                  config_parse_path,            &u->automount.where,                             "Automount" },
1459
1460                 { "What",                   config_parse_path,            &u->swap.parameters_fragment.what,               "Swap"    },
1461                 { "Priority",               config_parse_int,             &u->swap.parameters_fragment.priority,           "Swap"    },
1462
1463                 { "OnActive",               config_parse_timer,           &u->timer,                                       "Timer"   },
1464                 { "OnBoot",                 config_parse_timer,           &u->timer,                                       "Timer"   },
1465                 { "OnStartup",              config_parse_timer,           &u->timer,                                       "Timer"   },
1466                 { "OnUnitActive",           config_parse_timer,           &u->timer,                                       "Timer"   },
1467                 { "OnUnitInactive",         config_parse_timer,           &u->timer,                                       "Timer"   },
1468                 { "Unit",                   config_parse_timer_unit,      &u->timer,                                       "Timer"   },
1469
1470                 { "PathExists",             config_parse_path_spec,       &u->path,                                        "Path"    },
1471                 { "PathChanged",            config_parse_path_spec,       &u->path,                                        "Path"    },
1472                 { "DirectoryNotEmpty",      config_parse_path_spec,       &u->path,                                        "Path"    },
1473                 { "Unit",                   config_parse_path_unit,       &u->path,                                        "Path"    },
1474
1475                 /* The [Install] section is ignored here. */
1476                 { "Alias",                  NULL,                         NULL,                                            "Install" },
1477                 { "WantedBy",               NULL,                         NULL,                                            "Install" },
1478                 { "Also",                   NULL,                         NULL,                                            "Install" },
1479
1480                 { NULL, NULL, NULL, NULL }
1481         };
1482
1483 #undef EXEC_CONTEXT_CONFIG_ITEMS
1484
1485         const char *sections[4];
1486         int r;
1487         Set *symlink_names;
1488         FILE *f = NULL;
1489         char *filename = NULL, *id = NULL;
1490         Unit *merged;
1491
1492         if (!u) {
1493                 /* Dirty dirty hack. */
1494                 dump_items((FILE*) path, items);
1495                 return 0;
1496         }
1497
1498         assert(u);
1499         assert(path);
1500
1501         sections[0] = "Unit";
1502         sections[1] = section_table[u->meta.type];
1503         sections[2] = "Install";
1504         sections[3] = NULL;
1505
1506         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1507                 return -ENOMEM;
1508
1509         if (path_is_absolute(path)) {
1510
1511                 if (!(filename = strdup(path))) {
1512                         r = -ENOMEM;
1513                         goto finish;
1514                 }
1515
1516                 if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1517                         free(filename);
1518                         filename = NULL;
1519
1520                         if (r != -ENOENT)
1521                                 goto finish;
1522                 }
1523
1524         } else  {
1525                 char **p;
1526
1527                 STRV_FOREACH(p, u->meta.manager->lookup_paths.unit_path) {
1528
1529                         /* Instead of opening the path right away, we manually
1530                          * follow all symlinks and add their name to our unit
1531                          * name set while doing so */
1532                         if (!(filename = path_make_absolute(path, *p))) {
1533                                 r = -ENOMEM;
1534                                 goto finish;
1535                         }
1536
1537                         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1538                                 char *sn;
1539
1540                                 free(filename);
1541                                 filename = NULL;
1542
1543                                 if (r != -ENOENT)
1544                                         goto finish;
1545
1546                                 /* Empty the symlink names for the next run */
1547                                 while ((sn = set_steal_first(symlink_names)))
1548                                         free(sn);
1549
1550                                 continue;
1551                         }
1552
1553                         break;
1554                 }
1555         }
1556
1557         if (!filename) {
1558                 r = 0;
1559                 goto finish;
1560         }
1561
1562         merged = u;
1563         if ((r = merge_by_names(&merged, symlink_names, id)) < 0)
1564                 goto finish;
1565
1566         if (merged != u) {
1567                 u->meta.load_state = UNIT_MERGED;
1568                 r = 0;
1569                 goto finish;
1570         }
1571
1572         /* Now, parse the file contents */
1573         if ((r = config_parse(filename, f, sections, items, false, u)) < 0)
1574                 goto finish;
1575
1576         free(u->meta.fragment_path);
1577         u->meta.fragment_path = filename;
1578         filename = NULL;
1579
1580         u->meta.load_state = UNIT_LOADED;
1581         r = 0;
1582
1583 finish:
1584         set_free_free(symlink_names);
1585         free(filename);
1586
1587         if (f)
1588                 fclose(f);
1589
1590         return r;
1591 }
1592
1593 int unit_load_fragment(Unit *u) {
1594         int r;
1595
1596         assert(u);
1597
1598         if (u->meta.fragment_path) {
1599
1600                 if ((r = load_from_path(u, u->meta.fragment_path)) < 0)
1601                         return r;
1602
1603         } else {
1604                 Iterator i;
1605                 const char *t;
1606
1607                 /* Try to find the unit under its id */
1608                 if ((r = load_from_path(u, u->meta.id)) < 0)
1609                         return r;
1610
1611                 /* Try to find an alias we can load this with */
1612                 if (u->meta.load_state == UNIT_STUB)
1613                         SET_FOREACH(t, u->meta.names, i) {
1614
1615                                 if (t == u->meta.id)
1616                                         continue;
1617
1618                                 if ((r = load_from_path(u, t)) < 0)
1619                                         return r;
1620
1621                                 if (u->meta.load_state != UNIT_STUB)
1622                                         break;
1623                         }
1624
1625                 /* Now, follow the same logic, but look for a template */
1626                 if (u->meta.load_state == UNIT_STUB && u->meta.instance) {
1627                         char *k;
1628
1629                         if (!(k = unit_name_template(u->meta.id)))
1630                                 return -ENOMEM;
1631
1632                         r = load_from_path(u, k);
1633                         free(k);
1634
1635                         if (r < 0)
1636                                 return r;
1637
1638                         if (u->meta.load_state == UNIT_STUB)
1639                                 SET_FOREACH(t, u->meta.names, i) {
1640
1641                                         if (t == u->meta.id)
1642                                                 continue;
1643
1644                                         if (!(k = unit_name_template(t)))
1645                                                 return -ENOMEM;
1646
1647                                         r = load_from_path(u, k);
1648                                         free(k);
1649
1650                                         if (r < 0)
1651                                                 return r;
1652
1653                                         if (u->meta.load_state != UNIT_STUB)
1654                                                 break;
1655                                 }
1656                 }
1657         }
1658
1659         return 0;
1660 }
1661
1662 void unit_dump_config_items(FILE *f) {
1663         /* OK, this wins a prize for extreme ugliness. */
1664
1665         load_from_path(NULL, (const void*) f);
1666 }