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
  31 #include "unit.h"
  32 #include "strv.h"
  33 #include "conf-parser.h"
  34 #include "load-fragment.h"
  35 #include "log.h"
  36 #include "ioprio.h"
  37 #include "securebits.h"
  38 #include "missing.h"
  39
  40 static int config_parse_deps(
  41                 const char *filename,
  42                 unsigned line,
  43                 const char *section,
  44                 const char *lvalue,
  45                 const char *rvalue,
  46                 void *data,
  47                 void *userdata) {
  48
  49         UnitDependency d = PTR_TO_UINT(data);
  50         Unit *u = userdata;
  51         char *w;
  52         size_t l;
  53         char *state;
  54
  55         assert(filename);
  56         assert(lvalue);
  57         assert(rvalue);
  58
  59         FOREACH_WORD(w, &l, rvalue, state) {
  60                 char *t;
  61                 int r;
  62
  63                 if (!(t = strndup(w, l)))
  64                         return -ENOMEM;
  65
  66                 r = unit_add_dependency_by_name(u, d, t);
  67                 free(t);
  68
  69                 if (r < 0)
  70                         return r;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int config_parse_names(
  77                 const char *filename,
  78                 unsigned line,
  79                 const char *section,
  80                 const char *lvalue,
  81                 const char *rvalue,
  82                 void *data,
  83                 void *userdata) {
  84
  85         Unit *u = userdata;
  86         char *w;
  87         size_t l;
  88         char *state;
  89
  90         assert(filename);
  91         assert(lvalue);
  92         assert(rvalue);
  93         assert(data);
  94
  95         FOREACH_WORD(w, &l, rvalue, state) {
  96                 char *t;
  97                 int r;
  98                 Unit *other;
  99
 100                 if (!(t = strndup(w, l)))
 101                         return -ENOMEM;
 102
 103                 other = manager_get_unit(u->meta.manager, t);
 104
 105                 if (other) {
 106
 107                         if (other != u) {
 108
 109                                 if (other->meta.load_state != UNIT_STUB) {
 110                                         free(t);
 111                                         return -EEXIST;
 112                                 }
 113
 114                                 if ((r = unit_merge(u, other)) < 0) {
 115                                         free(t);
 116                                         return r;
 117                                 }
 118                         }
 119
 120                 } else {
 121                         if ((r = unit_add_name(u, t)) < 0) {
 122                                 free(t);
 123                                 return r;
 124                         }
 125                 }
 126
 127                 free(t);
 128         }
 129
 130         return 0;
 131 }
 132
 133 static int config_parse_listen(
 134                 const char *filename,
 135                 unsigned line,
 136                 const char *section,
 137                 const char *lvalue,
 138                 const char *rvalue,
 139                 void *data,
 140                 void *userdata) {
 141
 142         int r;
 143         SocketPort *p;
 144         Socket *s;
 145
 146         assert(filename);
 147         assert(lvalue);
 148         assert(rvalue);
 149         assert(data);
 150
 151         s = (Socket*) data;
 152
 153         if (!(p = new0(SocketPort, 1)))
 154                 return -ENOMEM;
 155
 156         if (streq(lvalue, "ListenFIFO")) {
 157                 p->type = SOCKET_FIFO;
 158
 159                 if (!(p->path = strdup(rvalue))) {
 160                         free(p);
 161                         return -ENOMEM;
 162                 }
 163         } else {
 164                 p->type = SOCKET_SOCKET;
 165
 166                 if ((r = socket_address_parse(&p->address, rvalue)) < 0) {
 167                         log_error("[%s:%u] Failed to parse address value: %s", filename, line, rvalue);
 168                         free(p);
 169                         return r;
 170                 }
 171
 172                 if (streq(lvalue, "ListenStream"))
 173                         p->address.type = SOCK_STREAM;
 174                 else if (streq(lvalue, "ListenDatagram"))
 175                         p->address.type = SOCK_DGRAM;
 176                 else {
 177                         assert(streq(lvalue, "ListenSequentialPacket"));
 178                         p->address.type = SOCK_SEQPACKET;
 179                 }
 180
 181                 if (socket_address_family(&p->address) != AF_LOCAL && p->address.type == SOCK_SEQPACKET) {
 182                         free(p);
 183                         return -EPROTONOSUPPORT;
 184                 }
 185         }
 186
 187         p->fd = -1;
 188         LIST_PREPEND(SocketPort, port, s->ports, p);
 189
 190         return 0;
 191 }
 192
 193 static int config_parse_socket_bind(
 194                 const char *filename,
 195                 unsigned line,
 196                 const char *section,
 197                 const char *lvalue,
 198                 const char *rvalue,
 199                 void *data,
 200                 void *userdata) {
 201
 202         int r;
 203         Socket *s;
 204
 205         assert(filename);
 206         assert(lvalue);
 207         assert(rvalue);
 208         assert(data);
 209
 210         s = (Socket*) data;
 211
 212         if ((r = parse_boolean(rvalue)) < 0) {
 213                 log_error("[%s:%u] Failed to parse bind IPv6 only value: %s", filename, line, rvalue);
 214                 return r;
 215         }
 216
 217         s->bind_ipv6_only = r ? SOCKET_ADDRESS_IPV6_ONLY : SOCKET_ADDRESS_BOTH;
 218
 219         return 0;
 220 }
 221
 222 static int config_parse_nice(
 223                 const char *filename,
 224                 unsigned line,
 225                 const char *section,
 226                 const char *lvalue,
 227                 const char *rvalue,
 228                 void *data,
 229                 void *userdata) {
 230
 231         ExecContext *c = data;
 232         int priority, r;
 233
 234         assert(filename);
 235         assert(lvalue);
 236         assert(rvalue);
 237         assert(data);
 238
 239         if ((r = safe_atoi(rvalue, &priority)) < 0) {
 240                 log_error("[%s:%u] Failed to parse nice priority: %s", filename, line, rvalue);
 241                 return r;
 242         }
 243
 244         if (priority < PRIO_MIN || priority >= PRIO_MAX) {
 245                 log_error("[%s:%u] Nice priority out of range: %s", filename, line, rvalue);
 246                 return -ERANGE;
 247         }
 248
 249         c->nice = priority;
 250         c->nice_set = false;
 251
 252         return 0;
 253 }
 254
 255 static int config_parse_oom_adjust(
 256                 const char *filename,
 257                 unsigned line,
 258                 const char *section,
 259                 const char *lvalue,
 260                 const char *rvalue,
 261                 void *data,
 262                 void *userdata) {
 263
 264         ExecContext *c = data;
 265         int oa, r;
 266
 267         assert(filename);
 268         assert(lvalue);
 269         assert(rvalue);
 270         assert(data);
 271
 272         if ((r = safe_atoi(rvalue, &oa)) < 0) {
 273                 log_error("[%s:%u] Failed to parse OOM adjust value: %s", filename, line, rvalue);
 274                 return r;
 275         }
 276
 277         if (oa < OOM_DISABLE || oa > OOM_ADJUST_MAX) {
 278                 log_error("[%s:%u] OOM adjust value out of range: %s", filename, line, rvalue);
 279                 return -ERANGE;
 280         }
 281
 282         c->oom_adjust = oa;
 283         c->oom_adjust_set = true;
 284
 285         return 0;
 286 }
 287
 288 static int config_parse_umask(
 289                 const char *filename,
 290                 unsigned line,
 291                 const char *section,
 292                 const char *lvalue,
 293                 const char *rvalue,
 294                 void *data,
 295                 void *userdata) {
 296
 297         mode_t *m = data;
 298         long l;
 299         char *x = NULL;
 300
 301         assert(filename);
 302         assert(lvalue);
 303         assert(rvalue);
 304         assert(data);
 305
 306         errno = 0;
 307         l = strtol(rvalue, &x, 8);
 308         if (!x || *x || errno) {
 309                 log_error("[%s:%u] Failed to parse umask value: %s", filename, line, rvalue);
 310                 return errno ? -errno : -EINVAL;
 311         }
 312
 313         if (l < 0000 || l > 0777) {
 314                 log_error("[%s:%u] umask value out of range: %s", filename, line, rvalue);
 315                 return -ERANGE;
 316         }
 317
 318         *m = (mode_t) l;
 319         return 0;
 320 }
 321
 322 static int config_parse_exec(
 323                 const char *filename,
 324                 unsigned line,
 325                 const char *section,
 326                 const char *lvalue,
 327                 const char *rvalue,
 328                 void *data,
 329                 void *userdata) {
 330
 331         ExecCommand **e = data, *ee, *nce = NULL;
 332         char **n;
 333         char *w;
 334         unsigned k;
 335         size_t l;
 336         char *state;
 337
 338         assert(filename);
 339         assert(lvalue);
 340         assert(rvalue);
 341         assert(data);
 342
 343         k = 0;
 344         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 345                 k++;
 346
 347         if (!(n = new(char*, k+1)))
 348                 return -ENOMEM;
 349
 350         k = 0;
 351         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 352                 if (!(n[k++] = strndup(w, l)))
 353                         goto fail;
 354
 355         n[k] = NULL;
 356
 357         if (!n[0] || !path_is_absolute(n[0])) {
 358                 log_error("[%s:%u] Invalid executable path in command line: %s", filename, line, rvalue);
 359                 strv_free(n);
 360                 return -EINVAL;
 361         }
 362
 363         if (!(nce = new0(ExecCommand, 1)))
 364                 goto fail;
 365
 366         nce->argv = n;
 367         if (!(nce->path = strdup(n[0])))
 368                 goto fail;
 369
 370         if (*e) {
 371                 /* It's kinda important that we keep the order here */
 372                 LIST_FIND_TAIL(ExecCommand, command, *e, ee);
 373                 LIST_INSERT_AFTER(ExecCommand, command, *e, ee, nce);
 374         } else
 375                 *e = nce;
 376
 377         return 0;
 378
 379 fail:
 380         for (; k > 0; k--)
 381                 free(n[k-1]);
 382         free(n);
 383
 384         free(nce);
 385
 386         return -ENOMEM;
 387 }
 388
 389 static int config_parse_usec(
 390                 const char *filename,
 391                 unsigned line,
 392                 const char *section,
 393                 const char *lvalue,
 394                 const char *rvalue,
 395                 void *data,
 396                 void *userdata) {
 397
 398         usec_t *usec = data;
 399         unsigned long long u;
 400         int r;
 401
 402         assert(filename);
 403         assert(lvalue);
 404         assert(rvalue);
 405         assert(data);
 406
 407         if ((r = safe_atollu(rvalue, &u)) < 0) {
 408                 log_error("[%s:%u] Failed to parse time value: %s", filename, line, rvalue);
 409                 return r;
 410         }
 411
 412         /* We actually assume the user configures seconds. Later on we
 413          * might choose to support suffixes for time values, to
 414          * configure bigger or smaller units */
 415
 416         *usec = u * USEC_PER_SEC;
 417
 418         return 0;
 419 }
 420
 421 static int config_parse_service_type(
 422                 const char *filename,
 423                 unsigned line,
 424                 const char *section,
 425                 const char *lvalue,
 426                 const char *rvalue,
 427                 void *data,
 428                 void *userdata) {
 429
 430         Service *s = data;
 431         ServiceType x;
 432
 433         assert(filename);
 434         assert(lvalue);
 435         assert(rvalue);
 436         assert(data);
 437
 438         if ((x = service_type_from_string(rvalue)) < 0) {
 439                 log_error("[%s:%u] Failed to parse service type: %s", filename, line, rvalue);
 440                 return -EBADMSG;
 441         }
 442
 443         s->type = x;
 444
 445         return 0;
 446 }
 447
 448 static int config_parse_service_restart(
 449                 const char *filename,
 450                 unsigned line,
 451                 const char *section,
 452                 const char *lvalue,
 453                 const char *rvalue,
 454                 void *data,
 455                 void *userdata) {
 456
 457         Service *s = data;
 458         ServiceRestart x;
 459
 460         assert(filename);
 461         assert(lvalue);
 462         assert(rvalue);
 463         assert(data);
 464
 465         if ((x = service_restart_from_string(rvalue)) < 0) {
 466                 log_error("[%s:%u] Failed to parse service restart specifier: %s", filename, line, rvalue);
 467                 return -EBADMSG;
 468         }
 469
 470         s->restart = x;
 471
 472         return 0;
 473 }
 474
 475 static int config_parse_bindtodevice(
 476                 const char *filename,
 477                 unsigned line,
 478                 const char *section,
 479                 const char *lvalue,
 480                 const char *rvalue,
 481                 void *data,
 482                 void *userdata) {
 483
 484         Socket *s = data;
 485         char *n;
 486
 487         assert(filename);
 488         assert(lvalue);
 489         assert(rvalue);
 490         assert(data);
 491
 492         if (rvalue[0] && !streq(rvalue, "*")) {
 493                 if (!(n = strdup(rvalue)))
 494                         return -ENOMEM;
 495         } else
 496                 n = NULL;
 497
 498         free(s->bind_to_device);
 499         s->bind_to_device = n;
 500
 501         return 0;
 502 }
 503
 504 static int config_parse_output(
 505                 const char *filename,
 506                 unsigned line,
 507                 const char *section,
 508                 const char *lvalue,
 509                 const char *rvalue,
 510                 void *data,
 511                 void *userdata) {
 512
 513         ExecOutput *o = data, x;
 514
 515         assert(filename);
 516         assert(lvalue);
 517         assert(rvalue);
 518         assert(data);
 519
 520         if ((x = exec_output_from_string(rvalue)) < 0) {
 521                 log_error("[%s:%u] Failed to parse output specifier: %s", filename, line, rvalue);
 522                 return -EBADMSG;
 523         }
 524
 525         *o = x;
 526
 527         return 0;
 528 }
 529
 530 static int config_parse_input(
 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         ExecInput *i = data, x;
 540
 541         assert(filename);
 542         assert(lvalue);
 543         assert(rvalue);
 544         assert(data);
 545
 546         if ((x = exec_input_from_string(rvalue)) < 0) {
 547                 log_error("[%s:%u] Failed to parse input specifier: %s", filename, line, rvalue);
 548                 return -EBADMSG;
 549         }
 550
 551         *i = x;
 552
 553         return 0;
 554 }
 555
 556 static int config_parse_facility(
 557                 const char *filename,
 558                 unsigned line,
 559                 const char *section,
 560                 const char *lvalue,
 561                 const char *rvalue,
 562                 void *data,
 563                 void *userdata) {
 564
 565
 566         int *o = data, x;
 567
 568         assert(filename);
 569         assert(lvalue);
 570         assert(rvalue);
 571         assert(data);
 572
 573         if ((x = log_facility_from_string(rvalue)) < 0)
 574
 575                 /* Second try, let's see if this is a number. */
 576                 if (safe_atoi(rvalue, &x) < 0 || !log_facility_to_string(x)) {
 577                         log_error("[%s:%u] Failed to parse log facility: %s", filename, line, rvalue);
 578                         return -EBADMSG;
 579                 }
 580
 581         *o = LOG_MAKEPRI(x, LOG_PRI(*o));
 582
 583         return 0;
 584 }
 585
 586 static int config_parse_level(
 587                 const char *filename,
 588                 unsigned line,
 589                 const char *section,
 590                 const char *lvalue,
 591                 const char *rvalue,
 592                 void *data,
 593                 void *userdata) {
 594
 595
 596         int *o = data, x;
 597
 598         assert(filename);
 599         assert(lvalue);
 600         assert(rvalue);
 601         assert(data);
 602
 603         if ((x = log_level_from_string(rvalue)) < 0)
 604
 605                 /* Second try, let's see if this is a number. */
 606                 if (safe_atoi(rvalue, &x) < 0 || !log_level_to_string(x)) {
 607                         log_error("[%s:%u] Failed to parse log level: %s", filename, line, rvalue);
 608                         return -EBADMSG;
 609                 }
 610
 611         *o = LOG_MAKEPRI(LOG_FAC(*o), x);
 612         return 0;
 613 }
 614
 615 static int config_parse_io_class(
 616                 const char *filename,
 617                 unsigned line,
 618                 const char *section,
 619                 const char *lvalue,
 620                 const char *rvalue,
 621                 void *data,
 622                 void *userdata) {
 623
 624         ExecContext *c = data;
 625         int x;
 626
 627         assert(filename);
 628         assert(lvalue);
 629         assert(rvalue);
 630         assert(data);
 631
 632         if ((x = ioprio_class_from_string(rvalue)) < 0)
 633
 634                 /* Second try, let's see if this is a number. */
 635                 if (safe_atoi(rvalue, &x) < 0 || !ioprio_class_to_string(x)) {
 636                         log_error("[%s:%u] Failed to parse IO scheduling class: %s", filename, line, rvalue);
 637                         return -EBADMSG;
 638                 }
 639
 640         c->ioprio = IOPRIO_PRIO_VALUE(x, IOPRIO_PRIO_DATA(c->ioprio));
 641         c->ioprio_set = true;
 642
 643         return 0;
 644 }
 645
 646 static int config_parse_io_priority(
 647                 const char *filename,
 648                 unsigned line,
 649                 const char *section,
 650                 const char *lvalue,
 651                 const char *rvalue,
 652                 void *data,
 653                 void *userdata) {
 654
 655         ExecContext *c = data;
 656         int i;
 657
 658         assert(filename);
 659         assert(lvalue);
 660         assert(rvalue);
 661         assert(data);
 662
 663         if (safe_atoi(rvalue, &i) < 0 || i < 0 || i >= IOPRIO_BE_NR) {
 664                 log_error("[%s:%u] Failed to parse io priority: %s", filename, line, rvalue);
 665                 return -EBADMSG;
 666         }
 667
 668         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_PRIO_CLASS(c->ioprio), i);
 669         c->ioprio_set = true;
 670
 671         return 0;
 672 }
 673
 674 static int config_parse_cpu_sched_policy(
 675                 const char *filename,
 676                 unsigned line,
 677                 const char *section,
 678                 const char *lvalue,
 679                 const char *rvalue,
 680                 void *data,
 681                 void *userdata) {
 682
 683
 684         ExecContext *c = data;
 685         int x;
 686
 687         assert(filename);
 688         assert(lvalue);
 689         assert(rvalue);
 690         assert(data);
 691
 692         if ((x = sched_policy_from_string(rvalue)) < 0)
 693
 694                 /* Second try, let's see if this is a number. */
 695                 if (safe_atoi(rvalue, &x) < 0 || !sched_policy_to_string(x)) {
 696                         log_error("[%s:%u] Failed to parse CPU scheduling policy: %s", filename, line, rvalue);
 697                         return -EBADMSG;
 698                 }
 699
 700         c->cpu_sched_policy = x;
 701         c->cpu_sched_set = true;
 702
 703         return 0;
 704 }
 705
 706 static int config_parse_cpu_sched_prio(
 707                 const char *filename,
 708                 unsigned line,
 709                 const char *section,
 710                 const char *lvalue,
 711                 const char *rvalue,
 712                 void *data,
 713                 void *userdata) {
 714
 715         ExecContext *c = data;
 716         int i;
 717
 718         assert(filename);
 719         assert(lvalue);
 720         assert(rvalue);
 721         assert(data);
 722
 723         /* On Linux RR/FIFO have the same range */
 724         if (safe_atoi(rvalue, &i) < 0 || i < sched_get_priority_min(SCHED_RR) || i > sched_get_priority_max(SCHED_RR)) {
 725                 log_error("[%s:%u] Failed to parse CPU scheduling priority: %s", filename, line, rvalue);
 726                 return -EBADMSG;
 727         }
 728
 729         c->cpu_sched_priority = i;
 730         c->cpu_sched_set = true;
 731
 732         return 0;
 733 }
 734
 735 static int config_parse_cpu_affinity(
 736                 const char *filename,
 737                 unsigned line,
 738                 const char *section,
 739                 const char *lvalue,
 740                 const char *rvalue,
 741                 void *data,
 742                 void *userdata) {
 743
 744         ExecContext *c = data;
 745         char *w;
 746         size_t l;
 747         char *state;
 748
 749         assert(filename);
 750         assert(lvalue);
 751         assert(rvalue);
 752         assert(data);
 753
 754         FOREACH_WORD(w, &l, rvalue, state) {
 755                 char *t;
 756                 int r;
 757                 unsigned cpu;
 758
 759                 if (!(t = strndup(w, l)))
 760                         return -ENOMEM;
 761
 762                 r = safe_atou(t, &cpu);
 763                 free(t);
 764
 765                 if (r < 0 || cpu >= CPU_SETSIZE) {
 766                         log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
 767                         return -EBADMSG;
 768                 }
 769
 770                 CPU_SET(cpu, &c->cpu_affinity);
 771         }
 772
 773         c->cpu_affinity_set = true;
 774
 775         return 0;
 776 }
 777
 778 static int config_parse_capabilities(
 779                 const char *filename,
 780                 unsigned line,
 781                 const char *section,
 782                 const char *lvalue,
 783                 const char *rvalue,
 784                 void *data,
 785                 void *userdata) {
 786
 787         ExecContext *c = data;
 788         cap_t cap;
 789
 790         assert(filename);
 791         assert(lvalue);
 792         assert(rvalue);
 793         assert(data);
 794
 795         if (!(cap = cap_from_text(rvalue))) {
 796                 if (errno == ENOMEM)
 797                         return -ENOMEM;
 798
 799                 log_error("[%s:%u] Failed to parse capabilities: %s", filename, line, rvalue);
 800                 return -EBADMSG;
 801         }
 802
 803         if (c->capabilities)
 804                 cap_free(c->capabilities);
 805         c->capabilities = cap;
 806
 807         return 0;
 808 }
 809
 810 static int config_parse_secure_bits(
 811                 const char *filename,
 812                 unsigned line,
 813                 const char *section,
 814                 const char *lvalue,
 815                 const char *rvalue,
 816                 void *data,
 817                 void *userdata) {
 818
 819         ExecContext *c = data;
 820         char *w;
 821         size_t l;
 822         char *state;
 823
 824         assert(filename);
 825         assert(lvalue);
 826         assert(rvalue);
 827         assert(data);
 828
 829         FOREACH_WORD(w, &l, rvalue, state) {
 830                 if (first_word(w, "keep-caps"))
 831                         c->secure_bits |= SECURE_KEEP_CAPS;
 832                 else if (first_word(w, "keep-caps-locked"))
 833                         c->secure_bits |= SECURE_KEEP_CAPS_LOCKED;
 834                 else if (first_word(w, "no-setuid-fixup"))
 835                         c->secure_bits |= SECURE_NO_SETUID_FIXUP;
 836                 else if (first_word(w, "no-setuid-fixup-locked"))
 837                         c->secure_bits |= SECURE_NO_SETUID_FIXUP_LOCKED;
 838                 else if (first_word(w, "noroot"))
 839                         c->secure_bits |= SECURE_NOROOT;
 840                 else if (first_word(w, "noroot-locked"))
 841                         c->secure_bits |= SECURE_NOROOT_LOCKED;
 842                 else {
 843                         log_error("[%s:%u] Failed to parse secure bits: %s", filename, line, rvalue);
 844                         return -EBADMSG;
 845                 }
 846         }
 847
 848         return 0;
 849 }
 850
 851 static int config_parse_bounding_set(
 852                 const char *filename,
 853                 unsigned line,
 854                 const char *section,
 855                 const char *lvalue,
 856                 const char *rvalue,
 857                 void *data,
 858                 void *userdata) {
 859
 860         ExecContext *c = data;
 861         char *w;
 862         size_t l;
 863         char *state;
 864
 865         assert(filename);
 866         assert(lvalue);
 867         assert(rvalue);
 868         assert(data);
 869
 870         FOREACH_WORD(w, &l, rvalue, state) {
 871                 char *t;
 872                 int r;
 873                 cap_value_t cap;
 874
 875                 if (!(t = strndup(w, l)))
 876                         return -ENOMEM;
 877
 878                 r = cap_from_name(t, &cap);
 879                 free(t);
 880
 881                 if (r < 0) {
 882                         log_error("[%s:%u] Failed to parse capability bounding set: %s", filename, line, rvalue);
 883                         return -EBADMSG;
 884                 }
 885
 886                 c->capability_bounding_set_drop |= 1 << cap;
 887         }
 888
 889         return 0;
 890 }
 891
 892 static int config_parse_timer_slack_ns(
 893                 const char *filename,
 894                 unsigned line,
 895                 const char *section,
 896                 const char *lvalue,
 897                 const char *rvalue,
 898                 void *data,
 899                 void *userdata) {
 900
 901         ExecContext *c = data;
 902         unsigned long u;
 903         int r;
 904
 905         assert(filename);
 906         assert(lvalue);
 907         assert(rvalue);
 908         assert(data);
 909
 910         if ((r = safe_atolu(rvalue, &u)) < 0) {
 911                 log_error("[%s:%u] Failed to parse time slack value: %s", filename, line, rvalue);
 912                 return r;
 913         }
 914
 915         c->timer_slack_ns = u;
 916
 917         return 0;
 918 }
 919
 920 static int config_parse_limit(
 921                 const char *filename,
 922                 unsigned line,
 923                 const char *section,
 924                 const char *lvalue,
 925                 const char *rvalue,
 926                 void *data,
 927                 void *userdata) {
 928
 929         struct rlimit **rl = data;
 930         unsigned long long u;
 931         int r;
 932
 933         assert(filename);
 934         assert(lvalue);
 935         assert(rvalue);
 936         assert(data);
 937
 938         if ((r = safe_atollu(rvalue, &u)) < 0) {
 939                 log_error("[%s:%u] Failed to parse resource value: %s", filename, line, rvalue);
 940                 return r;
 941         }
 942
 943         if (!*rl)
 944                 if (!(*rl = new(struct rlimit, 1)))
 945                         return -ENOMEM;
 946
 947         (*rl)->rlim_cur = (*rl)->rlim_max = (rlim_t) u;
 948         return 0;
 949 }
 950
 951 #define FOLLOW_MAX 8
 952
 953 static int open_follow(char **filename, FILE **_f, Set *names, char **_id) {
 954         unsigned c = 0;
 955         int fd, r;
 956         FILE *f;
 957         char *id = NULL;
 958
 959         assert(filename);
 960         assert(*filename);
 961         assert(_f);
 962         assert(names);
 963
 964         /* This will update the filename pointer if the loaded file is
 965          * reached by a symlink. The old string will be freed. */
 966
 967         for (;;) {
 968                 char *target, *k, *name;
 969
 970                 if (c++ >= FOLLOW_MAX)
 971                         return -ELOOP;
 972
 973                 path_kill_slashes(*filename);
 974
 975                 /* Add the file name we are currently looking at to
 976                  * the names of this unit */
 977                 name = file_name_from_path(*filename);
 978                 if (!(id = set_get(names, name))) {
 979
 980                         if (!(id = strdup(name)))
 981                                 return -ENOMEM;
 982
 983                         if ((r = set_put(names, id)) < 0) {
 984                                 free(id);
 985                                 return r;
 986                         }
 987                 }
 988
 989                 /* Try to open the file name, but don't if its a symlink */
 990                 if ((fd = open(*filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW)) >= 0)
 991                         break;
 992
 993                 if (errno != ELOOP)
 994                         return -errno;
 995
 996                 /* Hmm, so this is a symlink. Let's read the name, and follow it manually */
 997                 if ((r = readlink_malloc(*filename, &target)) < 0)
 998                         return r;
 999
1000                 k = file_in_same_dir(*filename, target);
1001                 free(target);
1002
1003                 if (!k)
1004                         return -ENOMEM;
1005
1006                 free(*filename);
1007                 *filename = k;
1008         }
1009
1010         if (!(f = fdopen(fd, "r"))) {
1011                 r = -errno;
1012                 assert(close_nointr(fd) == 0);
1013                 return r;
1014         }
1015
1016         *_f = f;
1017         *_id = id;
1018         return 0;
1019 }
1020
1021 static int load_from_path(Unit *u, const char *path) {
1022
1023         static const char* const section_table[_UNIT_TYPE_MAX] = {
1024                 [UNIT_SERVICE]   = "Service",
1025                 [UNIT_TIMER]     = "Timer",
1026                 [UNIT_SOCKET]    = "Socket",
1027                 [UNIT_TARGET]    = "Target",
1028                 [UNIT_DEVICE]    = "Device",
1029                 [UNIT_MOUNT]     = "Mount",
1030                 [UNIT_AUTOMOUNT] = "Automount",
1031                 [UNIT_SNAPSHOT]  = "Snapshot"
1032         };
1033
1034 #define EXEC_CONTEXT_CONFIG_ITEMS(context, section) \
1035                 { "WorkingDirectory",       config_parse_path,            &(context).working_directory,                    section   }, \
1036                 { "RootDirectory",          config_parse_path,            &(context).root_directory,                       section   }, \
1037                 { "User",                   config_parse_string,          &(context).user,                                 section   }, \
1038                 { "Group",                  config_parse_string,          &(context).group,                                section   }, \
1039                 { "SupplementaryGroups",    config_parse_strv,            &(context).supplementary_groups,                 section   }, \
1040                 { "Nice",                   config_parse_nice,            &(context),                                      section   }, \
1041                 { "OOMAdjust",              config_parse_oom_adjust,      &(context),                                      section   }, \
1042                 { "IOSchedulingClass",      config_parse_io_class,        &(context),                                      section   }, \
1043                 { "IOSchedulingPriority",   config_parse_io_priority,     &(context),                                      section   }, \
1044                 { "CPUSchedulingPolicy",    config_parse_cpu_sched_policy,&(context),                                      section   }, \
1045                 { "CPUSchedulingPriority",  config_parse_cpu_sched_prio,  &(context),                                      section   }, \
1046                 { "CPUSchedulingResetOnFork", config_parse_bool,          &(context).cpu_sched_reset_on_fork,              section   }, \
1047                 { "CPUAffinity",            config_parse_cpu_affinity,    &(context),                                      section   }, \
1048                 { "UMask",                  config_parse_umask,           &(context).umask,                                section   }, \
1049                 { "Environment",            config_parse_strv,            &(context).environment,                          section   }, \
1050                 { "Output",                 config_parse_output,          &(context).output,                               section   }, \
1051                 { "Input",                  config_parse_input,           &(context).input,                                section   }, \
1052                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
1053                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
1054                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
1055                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
1056                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
1057                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
1058                 { "TimerSlackNS",           config_parse_timer_slack_ns,  &(context),                                      section   }, \
1059                 { "LimitCPU",               config_parse_limit,           &(context).rlimit[RLIMIT_CPU],                   section   }, \
1060                 { "LimitFSIZE",             config_parse_limit,           &(context).rlimit[RLIMIT_FSIZE],                 section   }, \
1061                 { "LimitDATA",              config_parse_limit,           &(context).rlimit[RLIMIT_DATA],                  section   }, \
1062                 { "LimitSTACK",             config_parse_limit,           &(context).rlimit[RLIMIT_STACK],                 section   }, \
1063                 { "LimitCORE",              config_parse_limit,           &(context).rlimit[RLIMIT_CORE],                  section   }, \
1064                 { "LimitRSS",               config_parse_limit,           &(context).rlimit[RLIMIT_RSS],                   section   }, \
1065                 { "LimitNOFILE",            config_parse_limit,           &(context).rlimit[RLIMIT_NOFILE],                section   }, \
1066                 { "LimitAS",                config_parse_limit,           &(context).rlimit[RLIMIT_AS],                    section   }, \
1067                 { "LimitNPROC",             config_parse_limit,           &(context).rlimit[RLIMIT_NPROC],                 section   }, \
1068                 { "LimitMEMLOCK",           config_parse_limit,           &(context).rlimit[RLIMIT_MEMLOCK],               section   }, \
1069                 { "LimitLOCKS",             config_parse_limit,           &(context).rlimit[RLIMIT_LOCKS],                 section   }, \
1070                 { "LimitSIGPENDING",        config_parse_limit,           &(context).rlimit[RLIMIT_SIGPENDING],            section   }, \
1071                 { "LimitMSGQUEUE",          config_parse_limit,           &(context).rlimit[RLIMIT_MSGQUEUE],              section   }, \
1072                 { "LimitNICE",              config_parse_limit,           &(context).rlimit[RLIMIT_NICE],                  section   }, \
1073                 { "LimitRTPRIO",            config_parse_limit,           &(context).rlimit[RLIMIT_RTPRIO],                section   }, \
1074                 { "LimitRTTIME",            config_parse_limit,           &(context).rlimit[RLIMIT_RTTIME],                section   }
1075
1076         const ConfigItem items[] = {
1077                 { "Names",                  config_parse_names,           u,                                               "Meta"    },
1078                 { "Description",            config_parse_string,          &u->meta.description,                            "Meta"    },
1079                 { "Requires",               config_parse_deps,            UINT_TO_PTR(UNIT_REQUIRES),                      "Meta"    },
1080                 { "SoftRequires",           config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUIRES),                 "Meta"    },
1081                 { "Wants",                  config_parse_deps,            UINT_TO_PTR(UNIT_WANTS),                         "Meta"    },
1082                 { "Requisite",              config_parse_deps,            UINT_TO_PTR(UNIT_REQUISITE),                     "Meta"    },
1083                 { "SoftRequisite",          config_parse_deps,            UINT_TO_PTR(UNIT_SOFT_REQUISITE),                "Meta"    },
1084                 { "Conflicts",              config_parse_deps,            UINT_TO_PTR(UNIT_CONFLICTS),                     "Meta"    },
1085                 { "Before",                 config_parse_deps,            UINT_TO_PTR(UNIT_BEFORE),                        "Meta"    },
1086                 { "After",                  config_parse_deps,            UINT_TO_PTR(UNIT_AFTER),                         "Meta"    },
1087                 { "RecursiveStop",          config_parse_bool,            &u->meta.recursive_stop,                         "Meta"    },
1088                 { "StopWhenUnneeded",       config_parse_bool,            &u->meta.stop_when_unneeded,                     "Meta"    },
1089
1090                 { "PIDFile",                config_parse_path,            &u->service.pid_file,                            "Service" },
1091                 { "ExecStartPre",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_PRE,  "Service" },
1092                 { "ExecStart",              config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START,      "Service" },
1093                 { "ExecStartPost",          config_parse_exec,            u->service.exec_command+SERVICE_EXEC_START_POST, "Service" },
1094                 { "ExecReload",             config_parse_exec,            u->service.exec_command+SERVICE_EXEC_RELOAD,     "Service" },
1095                 { "ExecStop",               config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP,       "Service" },
1096                 { "ExecStopPost",           config_parse_exec,            u->service.exec_command+SERVICE_EXEC_STOP_POST,  "Service" },
1097                 { "RestartSec",             config_parse_usec,            &u->service.restart_usec,                        "Service" },
1098                 { "TimeoutSec",             config_parse_usec,            &u->service.timeout_usec,                        "Service" },
1099                 { "Type",                   config_parse_service_type,    &u->service,                                     "Service" },
1100                 { "Restart",                config_parse_service_restart, &u->service,                                     "Service" },
1101                 EXEC_CONTEXT_CONFIG_ITEMS(u->service.exec_context, "Service"),
1102
1103                 { "ListenStream",           config_parse_listen,          &u->socket,                                      "Socket"  },
1104                 { "ListenDatagram",         config_parse_listen,          &u->socket,                                      "Socket"  },
1105                 { "ListenSequentialPacket", config_parse_listen,          &u->socket,                                      "Socket"  },
1106                 { "ListenFIFO",             config_parse_listen,          &u->socket,                                      "Socket"  },
1107                 { "BindIPv6Only",           config_parse_socket_bind,     &u->socket,                                      "Socket"  },
1108                 { "Backlog",                config_parse_unsigned,        &u->socket.backlog,                              "Socket"  },
1109                 { "BindToDevice",           config_parse_bindtodevice,    &u->socket,                                      "Socket"  },
1110                 { "ExecStartPre",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_PRE,    "Socket"  },
1111                 { "ExecStartPost",          config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_START_POST,   "Socket"  },
1112                 { "ExecStopPre",            config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_PRE,     "Socket"  },
1113                 { "ExecStopPost",           config_parse_exec,            u->socket.exec_command+SOCKET_EXEC_STOP_POST,    "Socket"  },
1114                 EXEC_CONTEXT_CONFIG_ITEMS(u->socket.exec_context, "Socket"),
1115
1116                 EXEC_CONTEXT_CONFIG_ITEMS(u->automount.exec_context, "Automount"),
1117
1118                 { NULL, NULL, NULL, NULL }
1119         };
1120
1121 #undef EXEC_CONTEXT_CONFIG_ITEMS
1122
1123         const char *sections[3];
1124         char *k;
1125         int r;
1126         Set *symlink_names;
1127         FILE *f;
1128         char *filename, *id;
1129
1130         sections[0] = "Meta";
1131         sections[1] = section_table[u->meta.type];
1132         sections[2] = NULL;
1133
1134         if (!(symlink_names = set_new(string_hash_func, string_compare_func)))
1135                 return -ENOMEM;
1136
1137         /* Instead of opening the path right away, we manually
1138          * follow all symlinks and add their name to our unit
1139          * name set while doing so */
1140         if (!(filename = path_make_absolute(path, unit_path()))) {
1141                 r = -ENOMEM;
1142                 goto finish;
1143         }
1144
1145         if ((r = open_follow(&filename, &f, symlink_names, &id)) < 0) {
1146                 if (r == -ENOENT)
1147                         r = 0; /* returning 0 means: no suitable config file found */
1148
1149                 goto finish;
1150         }
1151
1152         /* Now, parse the file contents */
1153         r = config_parse(filename, f, sections, items, u);
1154         if (r < 0)
1155                 goto finish;
1156
1157         /* Let's try to add in all symlink names we found */
1158         while ((k = set_steal_first(symlink_names))) {
1159                 if ((r = unit_add_name(u, k)) < 0)
1160                         goto finish;
1161
1162
1163                 if (id == k)
1164                         unit_choose_id(u, id);
1165                 free(k);
1166         }
1167
1168
1169         free(u->meta.load_path);
1170         u->meta.load_path = filename;
1171         filename = NULL;
1172
1173         r = 1; /* returning 1 means: suitable config file found and loaded */
1174
1175 finish:
1176         while ((k = set_steal_first(symlink_names)))
1177                 free(k);
1178         set_free(symlink_names);
1179         free(filename);
1180
1181         return r;
1182 }
1183
1184 int unit_load_fragment(Unit *u) {
1185         int r = 0;
1186         ExecContext *c;
1187
1188         assert(u);
1189         assert(u->meta.load_state == UNIT_STUB);
1190
1191         if (u->meta.load_path)
1192                 r = load_from_path(u, u->meta.load_path);
1193         else {
1194                 Iterator i;
1195                 char *t;
1196
1197                 /* Try to find a name we can load this with */
1198                 SET_FOREACH(t, u->meta.names, i)
1199                         if ((r = load_from_path(u, t)) != 0)
1200                                 return r;
1201         }
1202
1203         if (u->meta.type == UNIT_SOCKET)
1204                 c = &u->socket.exec_context;
1205         else if (u->meta.type == UNIT_SERVICE)
1206                 c = &u->service.exec_context;
1207         else
1208                 c = NULL;
1209
1210         if (r >= 0 && c &&
1211             (c->output == EXEC_OUTPUT_KERNEL || c->output == EXEC_OUTPUT_SYSLOG)) {
1212                 int k;
1213
1214                 /* If syslog or kernel logging is requested, make sure
1215                  * our own logging daemon is run first. */
1216
1217                 if ((k = unit_add_dependency_by_name(u, UNIT_AFTER, SPECIAL_LOGGER_SOCKET)) < 0)
1218                         return k;
1219
1220                 if ((k = unit_add_dependency_by_name(u, UNIT_REQUIRES, SPECIAL_LOGGER_SOCKET)) < 0)
1221                         return k;
1222         }
1223
1224         return r;
1225 }