src/shared/conf-parser.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <limits.h>
   5 #include <stdint.h>
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/types.h>
  10
  11 #include "alloc-util.h"
  12 #include "conf-files.h"
  13 #include "conf-parser.h"
  14 #include "def.h"
  15 #include "extract-word.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "fs-util.h"
  19 #include "log.h"
  20 #include "macro.h"
  21 #include "parse-util.h"
  22 #include "path-util.h"
  23 #include "process-util.h"
  24 #include "signal-util.h"
  25 #include "socket-util.h"
  26 #include "string-util.h"
  27 #include "strv.h"
  28 #include "syslog-util.h"
  29 #include "time-util.h"
  30 #include "utf8.h"
  31
  32 /// Additional includes needed by elogind
  33 #include "def.h"
  34 #include "fileio.h"
  35 //#include "rlimit-util.h"
  36 //#include "rlimit-util.h"
  37 //#include "rlimit-util.h"
  38 //#include "rlimit-util.h"
  39 //#include "rlimit-util.h"
  40 //#include "rlimit-util.h"
  41 //#include "rlimit-util.h"
  42 //#include "rlimit-util.h"
  43 //#include "rlimit-util.h"
  44 //#include "rlimit-util.h"
  45 //#include "rlimit-util.h"
  46 //#include "rlimit-util.h"
  47 //#include "rlimit-util.h"
  48 //#include "rlimit-util.h"
  49 //#include "rlimit-util.h"
  50 //#include "rlimit-util.h"
  51
  52 int config_item_table_lookup(
  53                 const void *table,
  54                 const char *section,
  55                 const char *lvalue,
  56                 ConfigParserCallback *func,
  57                 int *ltype,
  58                 void **data,
  59                 void *userdata) {
  60
  61         const ConfigTableItem *t;
  62
  63         assert(table);
  64         assert(lvalue);
  65         assert(func);
  66         assert(ltype);
  67         assert(data);
  68
  69         for (t = table; t->lvalue; t++) {
  70
  71                 if (!streq(lvalue, t->lvalue))
  72                         continue;
  73
  74                 if (!streq_ptr(section, t->section))
  75                         continue;
  76
  77                 *func = t->parse;
  78                 *ltype = t->ltype;
  79                 *data = t->data;
  80                 return 1;
  81         }
  82
  83         return 0;
  84 }
  85
  86 int config_item_perf_lookup(
  87                 const void *table,
  88                 const char *section,
  89                 const char *lvalue,
  90                 ConfigParserCallback *func,
  91                 int *ltype,
  92                 void **data,
  93                 void *userdata) {
  94
  95         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  96         const ConfigPerfItem *p;
  97
  98         assert(table);
  99         assert(lvalue);
 100         assert(func);
 101         assert(ltype);
 102         assert(data);
 103
 104         if (!section)
 105                 p = lookup(lvalue, strlen(lvalue));
 106         else {
 107                 char *key;
 108
 109                 key = strjoin(section, ".", lvalue);
 110                 if (!key)
 111                         return -ENOMEM;
 112
 113                 p = lookup(key, strlen(key));
 114                 free(key);
 115         }
 116
 117         if (!p)
 118                 return 0;
 119
 120         *func = p->parse;
 121         *ltype = p->ltype;
 122         *data = (uint8_t*) userdata + p->offset;
 123         return 1;
 124 }
 125
 126 /* Run the user supplied parser for an assignment */
 127 static int next_assignment(
 128                 const char *unit,
 129                 const char *filename,
 130                 unsigned line,
 131                 ConfigItemLookup lookup,
 132                 const void *table,
 133                 const char *section,
 134                 unsigned section_line,
 135                 const char *lvalue,
 136                 const char *rvalue,
 137                 ConfigParseFlags flags,
 138                 void *userdata) {
 139
 140         ConfigParserCallback func = NULL;
 141         int ltype = 0;
 142         void *data = NULL;
 143         int r;
 144
 145         assert(filename);
 146         assert(line > 0);
 147         assert(lookup);
 148         assert(lvalue);
 149         assert(rvalue);
 150
 151         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 152         if (r < 0)
 153                 return r;
 154
 155         if (r > 0) {
 156                 if (func)
 157                         return func(unit, filename, line, section, section_line,
 158                                     lvalue, ltype, rvalue, data, userdata);
 159
 160                 return 0;
 161         }
 162
 163         /* Warn about unknown non-extension fields. */
 164         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(lvalue, "X-"))
 165                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 166
 167         return 0;
 168 }
 169
 170 /* Parse a single logical line */
 171 static int parse_line(
 172                 const char* unit,
 173                 const char *filename,
 174                 unsigned line,
 175                 const char *sections,
 176                 ConfigItemLookup lookup,
 177                 const void *table,
 178                 ConfigParseFlags flags,
 179                 char **section,
 180                 unsigned *section_line,
 181                 bool *section_ignored,
 182                 char *l,
 183                 void *userdata) {
 184
 185         char *e, *include;
 186
 187         assert(filename);
 188         assert(line > 0);
 189         assert(lookup);
 190         assert(l);
 191
 192         l = strstrip(l);
 193         if (!*l)
 194                 return 0;
 195
 196         if (strchr(COMMENTS "\n", *l))
 197                 return 0;
 198
 199         include = first_word(l, ".include");
 200         if (include) {
 201                 _cleanup_free_ char *fn = NULL;
 202
 203                 /* .includes are a bad idea, we only support them here
 204                  * for historical reasons. They create cyclic include
 205                  * problems and make it difficult to detect
 206                  * configuration file changes with an easy
 207                  * stat(). Better approaches, such as .d/ drop-in
 208                  * snippets exist.
 209                  *
 210                  * Support for them should be eventually removed. */
 211
 212                 if (!(flags & CONFIG_PARSE_ALLOW_INCLUDE)) {
 213                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 214                         return 0;
 215                 }
 216
 217                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 218                            ".include directives are deprecated, and support for them will be removed in a future version of elogind. "
 219                            "Please use drop-in files instead.");
 220
 221                 fn = file_in_same_dir(filename, strstrip(include));
 222                 if (!fn)
 223                         return -ENOMEM;
 224
 225                 return config_parse(unit, fn, NULL, sections, lookup, table, flags, userdata);
 226         }
 227
 228         if (!utf8_is_valid(l))
 229                 return log_syntax_invalid_utf8(unit, LOG_WARNING, filename, line, l);
 230
 231         if (*l == '[') {
 232                 size_t k;
 233                 char *n;
 234
 235                 k = strlen(l);
 236                 assert(k > 0);
 237
 238                 if (l[k-1] != ']') {
 239                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid section header '%s'", l);
 240                         return -EBADMSG;
 241                 }
 242
 243                 n = strndup(l+1, k-2);
 244                 if (!n)
 245                         return -ENOMEM;
 246
 247                 if (sections && !nulstr_contains(sections, n)) {
 248
 249                         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(n, "X-"))
 250                                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown section '%s'. Ignoring.", n);
 251
 252                         free(n);
 253                         *section = mfree(*section);
 254                         *section_line = 0;
 255                         *section_ignored = true;
 256                 } else {
 257                         free_and_replace(*section, n);
 258                         *section_line = line;
 259                         *section_ignored = false;
 260                 }
 261
 262                 return 0;
 263         }
 264
 265         if (sections && !*section) {
 266
 267                 if (!(flags & CONFIG_PARSE_RELAXED) && !*section_ignored)
 268                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 269
 270                 return 0;
 271         }
 272
 273         e = strchr(l, '=');
 274         if (!e) {
 275                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 276                 return -EINVAL;
 277         }
 278
 279         *e = 0;
 280         e++;
 281
 282         return next_assignment(unit,
 283                                filename,
 284                                line,
 285                                lookup,
 286                                table,
 287                                *section,
 288                                *section_line,
 289                                strstrip(l),
 290                                strstrip(e),
 291                                flags,
 292                                userdata);
 293 }
 294
 295 /* Go through the file and parse each line */
 296 int config_parse(const char *unit,
 297                  const char *filename,
 298                  FILE *f,
 299                  const char *sections,
 300                  ConfigItemLookup lookup,
 301                  const void *table,
 302                  ConfigParseFlags flags,
 303                  void *userdata) {
 304
 305         _cleanup_free_ char *section = NULL, *continuation = NULL;
 306         _cleanup_fclose_ FILE *ours = NULL;
 307         unsigned line = 0, section_line = 0;
 308         bool section_ignored = false;
 309         int r;
 310
 311         assert(filename);
 312         assert(lookup);
 313
 314         if (!f) {
 315                 f = ours = fopen(filename, "re");
 316                 if (!f) {
 317                         /* Only log on request, except for ENOENT,
 318                          * since we return 0 to the caller. */
 319                         if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
 320                                 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno,
 321                                                "Failed to open configuration file '%s': %m", filename);
 322                         return errno == ENOENT ? 0 : -errno;
 323                 }
 324         }
 325
 326         fd_warn_permissions(filename, fileno(f));
 327
 328         for (;;) {
 329                 _cleanup_free_ char *buf = NULL;
 330                 bool escaped = false;
 331                 char *l, *p, *e;
 332
 333                 r = read_line(f, LONG_LINE_MAX, &buf);
 334                 if (r == 0)
 335                         break;
 336                 if (r == -ENOBUFS) {
 337                         if (flags & CONFIG_PARSE_WARN)
 338                                 log_error_errno(r, "%s:%u: Line too long", filename, line);
 339
 340                         return r;
 341                 }
 342                 if (r < 0) {
 343                         if (CONFIG_PARSE_WARN)
 344                                 log_error_errno(r, "%s:%u: Error while reading configuration file: %m", filename, line);
 345
 346                         return r;
 347                 }
 348
 349                 l = buf;
 350                 if (!(flags & CONFIG_PARSE_REFUSE_BOM)) {
 351                         char *q;
 352
 353                         q = startswith(buf, UTF8_BYTE_ORDER_MARK);
 354                         if (q) {
 355                                 l = q;
 356                                 flags |= CONFIG_PARSE_REFUSE_BOM;
 357                         }
 358                 }
 359
 360                 if (continuation) {
 361                         if (strlen(continuation) + strlen(l) > LONG_LINE_MAX) {
 362                                 if (flags & CONFIG_PARSE_WARN)
 363                                         log_error("%s:%u: Continuation line too long", filename, line);
 364                                 return -ENOBUFS;
 365                         }
 366
 367                         if (!strextend(&continuation, l, NULL)) {
 368                                 if (flags & CONFIG_PARSE_WARN)
 369                                         log_oom();
 370                                 return -ENOMEM;
 371                         }
 372
 373                         p = continuation;
 374                 } else
 375                         p = l;
 376
 377                 for (e = p; *e; e++) {
 378                         if (escaped)
 379                                 escaped = false;
 380                         else if (*e == '\\')
 381                                 escaped = true;
 382                 }
 383
 384                 if (escaped) {
 385                         *(e-1) = ' ';
 386
 387                         if (!continuation) {
 388                                 continuation = strdup(l);
 389                                 if (!continuation) {
 390                                         if (flags & CONFIG_PARSE_WARN)
 391                                                 log_oom();
 392                                         return -ENOMEM;
 393                                 }
 394                         }
 395
 396                         continue;
 397                 }
 398
 399                 r = parse_line(unit,
 400                                filename,
 401                                ++line,
 402                                sections,
 403                                lookup,
 404                                table,
 405                                flags,
 406                                &section,
 407                                &section_line,
 408                                &section_ignored,
 409                                p,
 410                                userdata);
 411                 if (r < 0) {
 412                         if (flags & CONFIG_PARSE_WARN)
 413                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 414                         return r;
 415                 }
 416
 417                 continuation = mfree(continuation);
 418         }
 419
 420         if (continuation) {
 421                 r = parse_line(unit,
 422                                filename,
 423                                ++line,
 424                                sections,
 425                                lookup,
 426                                table,
 427                                flags,
 428                                &section,
 429                                &section_line,
 430                                &section_ignored,
 431                                continuation,
 432                                userdata);
 433                 if (r < 0) {
 434                         if (flags & CONFIG_PARSE_WARN)
 435                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 436                         return r;
 437                 }
 438         }
 439
 440         return 0;
 441 }
 442
 443 static int config_parse_many_files(
 444                 const char *conf_file,
 445                 char **files,
 446                 const char *sections,
 447                 ConfigItemLookup lookup,
 448                 const void *table,
 449                 ConfigParseFlags flags,
 450                 void *userdata) {
 451
 452         char **fn;
 453         int r;
 454
 455         if (conf_file) {
 456                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, flags, userdata);
 457                 if (r < 0)
 458                         return r;
 459         }
 460
 461         STRV_FOREACH(fn, files) {
 462                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata);
 463                 if (r < 0)
 464                         return r;
 465         }
 466
 467         return 0;
 468 }
 469
 470 /* Parse each config file in the directories specified as nulstr. */
 471 int config_parse_many_nulstr(
 472                 const char *conf_file,
 473                 const char *conf_file_dirs,
 474                 const char *sections,
 475                 ConfigItemLookup lookup,
 476                 const void *table,
 477                 ConfigParseFlags flags,
 478                 void *userdata) {
 479
 480         _cleanup_strv_free_ char **files = NULL;
 481         int r;
 482
 483         r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 484         if (r < 0)
 485                 return r;
 486
 487         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 488 }
 489
 490 #if 0 /// UNNEEDED by elogind
 491 /* Parse each config file in the directories specified as strv. */
 492 int config_parse_many(
 493                 const char *conf_file,
 494                 const char* const* conf_file_dirs,
 495                 const char *dropin_dirname,
 496                 const char *sections,
 497                 ConfigItemLookup lookup,
 498                 const void *table,
 499                 ConfigParseFlags flags,
 500                 void *userdata) {
 501
 502         _cleanup_strv_free_ char **dropin_dirs = NULL;
 503         _cleanup_strv_free_ char **files = NULL;
 504         const char *suffix;
 505         int r;
 506
 507         suffix = strjoina("/", dropin_dirname);
 508         r = strv_extend_strv_concat(&dropin_dirs, (char**) conf_file_dirs, suffix);
 509         if (r < 0)
 510                 return r;
 511
 512         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char* const*) dropin_dirs);
 513         if (r < 0)
 514                 return r;
 515
 516         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 517 }
 518 #endif // 0
 519
 520 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 521         DEFINE_CONFIG_PARSE_PTR(config_parse_##type, conv_func, vartype, "Failed to parse " #type " value")
 522
 523 DEFINE_PARSER(int, int, safe_atoi);
 524 DEFINE_PARSER(long, long, safe_atoli);
 525 #if 0 /// UNNEEDED by elogind
 526 DEFINE_PARSER(uint8, uint8_t, safe_atou8);
 527 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 528 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 529 #endif // 0
 530 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 531 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 532 DEFINE_PARSER(double, double, safe_atod);
 533 #if 0 /// UNNEEDED by elogind
 534 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 535 #endif // 0
 536 DEFINE_PARSER(sec, usec_t, parse_sec);
 537 DEFINE_PARSER(mode, mode_t, parse_mode);
 538
 539 int config_parse_iec_size(const char* unit,
 540                             const char *filename,
 541                             unsigned line,
 542                             const char *section,
 543                             unsigned section_line,
 544                             const char *lvalue,
 545                             int ltype,
 546                             const char *rvalue,
 547                             void *data,
 548                             void *userdata) {
 549
 550         size_t *sz = data;
 551         uint64_t v;
 552         int r;
 553
 554         assert(filename);
 555         assert(lvalue);
 556         assert(rvalue);
 557         assert(data);
 558
 559         r = parse_size(rvalue, 1024, &v);
 560         if (r < 0 || (uint64_t) (size_t) v != v) {
 561                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 562                 return 0;
 563         }
 564
 565         *sz = (size_t) v;
 566         return 0;
 567 }
 568
 569 #if 0 /// UNNEEDED by elogind
 570 int config_parse_si_size(
 571                 const char* unit,
 572                 const char *filename,
 573                 unsigned line,
 574                 const char *section,
 575                 unsigned section_line,
 576                 const char *lvalue,
 577                 int ltype,
 578                 const char *rvalue,
 579                 void *data,
 580                 void *userdata) {
 581
 582         size_t *sz = data;
 583         uint64_t v;
 584         int r;
 585
 586         assert(filename);
 587         assert(lvalue);
 588         assert(rvalue);
 589         assert(data);
 590
 591         r = parse_size(rvalue, 1000, &v);
 592         if (r < 0 || (uint64_t) (size_t) v != v) {
 593                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 594                 return 0;
 595         }
 596
 597         *sz = (size_t) v;
 598         return 0;
 599 }
 600
 601 int config_parse_iec_uint64(
 602                 const char* unit,
 603                 const char *filename,
 604                 unsigned line,
 605                 const char *section,
 606                 unsigned section_line,
 607                 const char *lvalue,
 608                 int ltype,
 609                 const char *rvalue,
 610                 void *data,
 611                 void *userdata) {
 612
 613         uint64_t *bytes = data;
 614         int r;
 615
 616         assert(filename);
 617         assert(lvalue);
 618         assert(rvalue);
 619         assert(data);
 620
 621         r = parse_size(rvalue, 1024, bytes);
 622         if (r < 0)
 623                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 624
 625         return 0;
 626 }
 627 #endif // 0
 628
 629 int config_parse_bool(const char* unit,
 630                       const char *filename,
 631                       unsigned line,
 632                       const char *section,
 633                       unsigned section_line,
 634                       const char *lvalue,
 635                       int ltype,
 636                       const char *rvalue,
 637                       void *data,
 638                       void *userdata) {
 639
 640         int k;
 641         bool *b = data;
 642         bool fatal = ltype;
 643
 644         assert(filename);
 645         assert(lvalue);
 646         assert(rvalue);
 647         assert(data);
 648
 649         k = parse_boolean(rvalue);
 650         if (k < 0) {
 651                 log_syntax(unit, LOG_ERR, filename, line, k,
 652                            "Failed to parse boolean value%s: %s",
 653                            fatal ? "" : ", ignoring", rvalue);
 654                 return fatal ? -ENOEXEC : 0;
 655         }
 656
 657         *b = k;
 658         return 0;
 659 }
 660
 661 #if 0 /// UNNEEDED by elogind
 662 int config_parse_tristate(
 663                 const char* unit,
 664                 const char *filename,
 665                 unsigned line,
 666                 const char *section,
 667                 unsigned section_line,
 668                 const char *lvalue,
 669                 int ltype,
 670                 const char *rvalue,
 671                 void *data,
 672                 void *userdata) {
 673
 674         int k, *t = data;
 675
 676         assert(filename);
 677         assert(lvalue);
 678         assert(rvalue);
 679         assert(data);
 680
 681         /* A tristate is pretty much a boolean, except that it can
 682          * also take the special value -1, indicating "uninitialized",
 683          * much like NULL is for a pointer type. */
 684
 685         k = parse_boolean(rvalue);
 686         if (k < 0) {
 687                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 688                 return 0;
 689         }
 690
 691         *t = !!k;
 692         return 0;
 693 }
 694 #endif // 0
 695
 696 int config_parse_string(
 697                 const char *unit,
 698                 const char *filename,
 699                 unsigned line,
 700                 const char *section,
 701                 unsigned section_line,
 702                 const char *lvalue,
 703                 int ltype,
 704                 const char *rvalue,
 705                 void *data,
 706                 void *userdata) {
 707
 708         char **s = data;
 709
 710         assert(filename);
 711         assert(lvalue);
 712         assert(rvalue);
 713         assert(data);
 714
 715         if (free_and_strdup(s, empty_to_null(rvalue)) < 0)
 716                 return log_oom();
 717
 718         return 0;
 719 }
 720
 721 int config_parse_path(
 722                 const char *unit,
 723                 const char *filename,
 724                 unsigned line,
 725                 const char *section,
 726                 unsigned section_line,
 727                 const char *lvalue,
 728                 int ltype,
 729                 const char *rvalue,
 730                 void *data,
 731                 void *userdata) {
 732
 733         _cleanup_free_ char *n = NULL;
 734         bool fatal = ltype;
 735         char **s = data;
 736         int r;
 737
 738         assert(filename);
 739         assert(lvalue);
 740         assert(rvalue);
 741         assert(data);
 742
 743         if (isempty(rvalue))
 744                 goto finalize;
 745
 746         n = strdup(rvalue);
 747         if (!n)
 748                 return log_oom();
 749
 750         r = path_simplify_and_warn(n, PATH_CHECK_ABSOLUTE | (fatal ? PATH_CHECK_FATAL : 0), unit, filename, line, lvalue);
 751         if (r < 0)
 752                 return fatal ? -ENOEXEC : 0;
 753
 754 finalize:
 755         return free_and_replace(*s, n);
 756 }
 757
 758 int config_parse_strv(
 759                 const char *unit,
 760                 const char *filename,
 761                 unsigned line,
 762                 const char *section,
 763                 unsigned section_line,
 764                 const char *lvalue,
 765                 int ltype,
 766                 const char *rvalue,
 767                 void *data,
 768                 void *userdata) {
 769
 770         char ***sv = data;
 771         int r;
 772
 773         assert(filename);
 774         assert(lvalue);
 775         assert(rvalue);
 776         assert(data);
 777
 778         if (isempty(rvalue)) {
 779                 *sv = strv_free(*sv);
 780                 return 0;
 781         }
 782
 783         for (;;) {
 784                 char *word = NULL;
 785
 786                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES|EXTRACT_RETAIN_ESCAPE);
 787                 if (r == 0)
 788                         break;
 789                 if (r == -ENOMEM)
 790                         return log_oom();
 791                 if (r < 0) {
 792                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
 793                         break;
 794                 }
 795
 796                 r = strv_consume(sv, word);
 797                 if (r < 0)
 798                         return log_oom();
 799         }
 800
 801         return 0;
 802 }
 803
 804 int config_parse_warn_compat(
 805                 const char *unit,
 806                 const char *filename,
 807                 unsigned line,
 808                 const char *section,
 809                 unsigned section_line,
 810                 const char *lvalue,
 811                 int ltype,
 812                 const char *rvalue,
 813                 void *data,
 814                 void *userdata) {
 815
 816         Disabled reason = ltype;
 817
 818         switch(reason) {
 819
 820         case DISABLED_CONFIGURATION:
 821                 log_syntax(unit, LOG_DEBUG, filename, line, 0,
 822                            "Support for option %s= has been disabled at compile time and it is ignored", lvalue);
 823                 break;
 824
 825         case DISABLED_LEGACY:
 826                 log_syntax(unit, LOG_INFO, filename, line, 0,
 827                            "Support for option %s= has been removed and it is ignored", lvalue);
 828                 break;
 829
 830         case DISABLED_EXPERIMENTAL:
 831                 log_syntax(unit, LOG_INFO, filename, line, 0,
 832                            "Support for option %s= has not yet been enabled and it is ignored", lvalue);
 833                 break;
 834         }
 835
 836         return 0;
 837 }
 838
 839 #if 0 /// UNNEEDED by elogind
 840 int config_parse_log_facility(
 841                 const char *unit,
 842                 const char *filename,
 843                 unsigned line,
 844                 const char *section,
 845                 unsigned section_line,
 846                 const char *lvalue,
 847                 int ltype,
 848                 const char *rvalue,
 849                 void *data,
 850                 void *userdata) {
 851
 852         int *o = data, x;
 853
 854         assert(filename);
 855         assert(lvalue);
 856         assert(rvalue);
 857         assert(data);
 858
 859         x = log_facility_unshifted_from_string(rvalue);
 860         if (x < 0) {
 861                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 862                 return 0;
 863         }
 864
 865         *o = (x << 3) | LOG_PRI(*o);
 866
 867         return 0;
 868 }
 869 #endif // 0
 870
 871 int config_parse_log_level(
 872                 const char *unit,
 873                 const char *filename,
 874                 unsigned line,
 875                 const char *section,
 876                 unsigned section_line,
 877                 const char *lvalue,
 878                 int ltype,
 879                 const char *rvalue,
 880                 void *data,
 881                 void *userdata) {
 882
 883         int *o = data, x;
 884
 885         assert(filename);
 886         assert(lvalue);
 887         assert(rvalue);
 888         assert(data);
 889
 890         x = log_level_from_string(rvalue);
 891         if (x < 0) {
 892                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 893                 return 0;
 894         }
 895
 896         if (*o < 0) /* if it wasn't initialized so far, assume zero facility */
 897                 *o = x;
 898         else
 899                 *o = (*o & LOG_FACMASK) | x;
 900
 901         return 0;
 902 }
 903
 904 int config_parse_signal(
 905                 const char *unit,
 906                 const char *filename,
 907                 unsigned line,
 908                 const char *section,
 909                 unsigned section_line,
 910                 const char *lvalue,
 911                 int ltype,
 912                 const char *rvalue,
 913                 void *data,
 914                 void *userdata) {
 915
 916         int *sig = data, r;
 917
 918         assert(filename);
 919         assert(lvalue);
 920         assert(rvalue);
 921         assert(sig);
 922
 923         r = signal_from_string(rvalue);
 924         if (r <= 0) {
 925                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 926                 return 0;
 927         }
 928
 929         *sig = r;
 930         return 0;
 931 }
 932
 933 #if 0 /// UNNEEDED by elogind
 934 int config_parse_personality(
 935                 const char *unit,
 936                 const char *filename,
 937                 unsigned line,
 938                 const char *section,
 939                 unsigned section_line,
 940                 const char *lvalue,
 941                 int ltype,
 942                 const char *rvalue,
 943                 void *data,
 944                 void *userdata) {
 945
 946         unsigned long *personality = data, p;
 947
 948         assert(filename);
 949         assert(lvalue);
 950         assert(rvalue);
 951         assert(personality);
 952
 953         if (isempty(rvalue))
 954                 p = PERSONALITY_INVALID;
 955         else {
 956                 p = personality_from_string(rvalue);
 957                 if (p == PERSONALITY_INVALID) {
 958                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
 959                         return 0;
 960                 }
 961         }
 962
 963         *personality = p;
 964         return 0;
 965 }
 966
 967 int config_parse_ifname(
 968                 const char *unit,
 969                 const char *filename,
 970                 unsigned line,
 971                 const char *section,
 972                 unsigned section_line,
 973                 const char *lvalue,
 974                 int ltype,
 975                 const char *rvalue,
 976                 void *data,
 977                 void *userdata) {
 978
 979         char **s = data;
 980         int r;
 981
 982         assert(filename);
 983         assert(lvalue);
 984         assert(rvalue);
 985         assert(data);
 986
 987         if (isempty(rvalue)) {
 988                 *s = mfree(*s);
 989                 return 0;
 990         }
 991
 992         if (!ifname_valid(rvalue)) {
 993                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
 994                 return 0;
 995         }
 996
 997         r = free_and_strdup(s, rvalue);
 998         if (r < 0)
 999                 return log_oom();
1000
1001         return 0;
1002 }
1003
1004 int config_parse_ip_port(
1005                 const char *unit,
1006                 const char *filename,
1007                 unsigned line,
1008                 const char *section,
1009                 unsigned section_line,
1010                 const char *lvalue,
1011                 int ltype,
1012                 const char *rvalue,
1013                 void *data,
1014                 void *userdata) {
1015
1016         uint16_t *s = data;
1017         uint16_t port;
1018         int r;
1019
1020         assert(filename);
1021         assert(lvalue);
1022         assert(rvalue);
1023         assert(data);
1024
1025         if (isempty(rvalue)) {
1026                 *s = 0;
1027                 return 0;
1028         }
1029
1030         r = parse_ip_port(rvalue, &port);
1031         if (r < 0) {
1032                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse port '%s'.", rvalue);
1033                 return 0;
1034         }
1035
1036         *s = port;
1037
1038         return 0;
1039 }
1040
1041 int config_parse_join_controllers(
1042                 const char *unit,
1043                 const char *filename,
1044                 unsigned line,
1045                 const char *section,
1046                 unsigned section_line,
1047                 const char *lvalue,
1048                 int ltype,
1049                 const char *rvalue,
1050                 void *data,
1051                 void *userdata) {
1052
1053         char ****ret = data;
1054         const char *whole_rvalue = rvalue;
1055         unsigned n = 0;
1056         _cleanup_(strv_free_freep) char ***controllers = NULL;
1057
1058         assert(filename);
1059         assert(lvalue);
1060         assert(rvalue);
1061         assert(ret);
1062
1063         for (;;) {
1064                 _cleanup_free_ char *word = NULL;
1065                 char **l;
1066                 int r;
1067
1068                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1069                 if (r < 0) {
1070                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1071                         return r;
1072                 }
1073                 if (r == 0)
1074                         break;
1075
1076                 l = strv_split(word, ",");
1077                 if (!l)
1078                         return log_oom();
1079                 strv_uniq(l);
1080
1081                 if (strv_length(l) <= 1) {
1082                         strv_free(l);
1083                         continue;
1084                 }
1085
1086                 if (!controllers) {
1087                         controllers = new(char**, 2);
1088                         if (!controllers) {
1089                                 strv_free(l);
1090                                 return log_oom();
1091                         }
1092
1093                         controllers[0] = l;
1094                         controllers[1] = NULL;
1095
1096                         n = 1;
1097                 } else {
1098                         char ***a;
1099                         char ***t;
1100
1101                         t = new0(char**, n+2);
1102                         if (!t) {
1103                                 strv_free(l);
1104                                 return log_oom();
1105                         }
1106
1107                         n = 0;
1108
1109                         for (a = controllers; *a; a++)
1110                                 if (strv_overlap(*a, l)) {
1111                                         if (strv_extend_strv(&l, *a, false) < 0) {
1112                                                 strv_free(l);
1113                                                 strv_free_free(t);
1114                                                 return log_oom();
1115                                         }
1116
1117                                 } else {
1118                                         char **c;
1119
1120                                         c = strv_copy(*a);
1121                                         if (!c) {
1122                                                 strv_free(l);
1123                                                 strv_free_free(t);
1124                                                 return log_oom();
1125                                         }
1126
1127                                         t[n++] = c;
1128                                 }
1129
1130                         t[n++] = strv_uniq(l);
1131
1132                         strv_free_free(controllers);
1133                         controllers = t;
1134                 }
1135         }
1136         if (!isempty(rvalue))
1137                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1138
1139         /* As a special case, return a single empty strv, to override the default */
1140         if (!controllers) {
1141                 controllers = new(char**, 2);
1142                 if (!controllers)
1143                         return log_oom();
1144                 controllers[0] = strv_new(NULL, NULL);
1145                 if (!controllers[0])
1146                         return log_oom();
1147                 controllers[1] = NULL;
1148         }
1149
1150         strv_free_free(*ret);
1151         *ret = TAKE_PTR(controllers);
1152
1153         return 0;
1154 }
1155 #endif // 0
1156
1157 int config_parse_mtu(
1158                 const char *unit,
1159                 const char *filename,
1160                 unsigned line,
1161                 const char *section,
1162                 unsigned section_line,
1163                 const char *lvalue,
1164                 int ltype,
1165                 const char *rvalue,
1166                 void *data,
1167                 void *userdata) {
1168
1169         uint32_t *mtu = data;
1170         int r;
1171
1172         assert(rvalue);
1173         assert(mtu);
1174
1175         r = parse_mtu(ltype, rvalue, mtu);
1176         if (r == -ERANGE) {
1177                 log_syntax(unit, LOG_ERR, filename, line, r,
1178                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1179                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1180                            rvalue);
1181                 return 0;
1182         }
1183         if (r < 0) {
1184                 log_syntax(unit, LOG_ERR, filename, line, r,
1185                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1186                 return 0;
1187         }
1188
1189         return 0;
1190 }
1191
1192 int config_parse_rlimit(
1193                 const char *unit,
1194                 const char *filename,
1195                 unsigned line,
1196                 const char *section,
1197                 unsigned section_line,
1198                 const char *lvalue,
1199                 int ltype,
1200                 const char *rvalue,
1201                 void *data,
1202                 void *userdata) {
1203
1204         struct rlimit **rl = data, d = {};
1205         int r;
1206
1207         assert(rvalue);
1208         assert(rl);
1209
1210         r = rlimit_parse(ltype, rvalue, &d);
1211         if (r == -EILSEQ) {
1212                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1213                 return 0;
1214         }
1215         if (r < 0) {
1216                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1217                 return 0;
1218         }
1219
1220         if (rl[ltype])
1221                 *rl[ltype] = d;
1222         else {
1223                 rl[ltype] = newdup(struct rlimit, &d, 1);
1224                 if (!rl[ltype])
1225                         return log_oom();
1226         }
1227
1228         return 0;
1229 }
1230
1231 int config_parse_permille(const char* unit,
1232                           const char *filename,
1233                           unsigned line,
1234                           const char *section,
1235                           unsigned section_line,
1236                           const char *lvalue,
1237                           int ltype,
1238                           const char *rvalue,
1239                           void *data,
1240                           void *userdata) {
1241
1242         unsigned *permille = data;
1243         int r;
1244
1245         assert(filename);
1246         assert(lvalue);
1247         assert(rvalue);
1248         assert(permille);
1249
1250         r = parse_permille(rvalue);
1251         if (r < 0) {
1252                 log_syntax(unit, LOG_ERR, filename, line, r,
1253                            "Failed to parse permille value, ignoring: %s", rvalue);
1254                 return 0;
1255         }
1256
1257         *permille = (unsigned) r;
1258
1259         return 0;
1260 }