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