src/shared/conf-parser.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <limits.h>
  10 #include <stdint.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15
  16 #include "alloc-util.h"
  17 #include "conf-files.h"
  18 #include "conf-parser.h"
  19 #include "def.h"
  20 #include "extract-word.h"
  21 #include "fd-util.h"
  22 #include "fileio.h"
  23 #include "fs-util.h"
  24 #include "log.h"
  25 #include "macro.h"
  26 #include "parse-util.h"
  27 #include "path-util.h"
  28 #include "process-util.h"
  29 #include "signal-util.h"
  30 #include "socket-util.h"
  31 #include "string-util.h"
  32 #include "strv.h"
  33 #include "syslog-util.h"
  34 #include "time-util.h"
  35 #include "utf8.h"
  36 #include "rlimit-util.h"
  37
  38 int config_item_table_lookup(
  39                 const void *table,
  40                 const char *section,
  41                 const char *lvalue,
  42                 ConfigParserCallback *func,
  43                 int *ltype,
  44                 void **data,
  45                 void *userdata) {
  46
  47         const ConfigTableItem *t;
  48
  49         assert(table);
  50         assert(lvalue);
  51         assert(func);
  52         assert(ltype);
  53         assert(data);
  54
  55         for (t = table; t->lvalue; t++) {
  56
  57                 if (!streq(lvalue, t->lvalue))
  58                         continue;
  59
  60                 if (!streq_ptr(section, t->section))
  61                         continue;
  62
  63                 *func = t->parse;
  64                 *ltype = t->ltype;
  65                 *data = t->data;
  66                 return 1;
  67         }
  68
  69         return 0;
  70 }
  71
  72 int config_item_perf_lookup(
  73                 const void *table,
  74                 const char *section,
  75                 const char *lvalue,
  76                 ConfigParserCallback *func,
  77                 int *ltype,
  78                 void **data,
  79                 void *userdata) {
  80
  81         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  82         const ConfigPerfItem *p;
  83
  84         assert(table);
  85         assert(lvalue);
  86         assert(func);
  87         assert(ltype);
  88         assert(data);
  89
  90         if (!section)
  91                 p = lookup(lvalue, strlen(lvalue));
  92         else {
  93                 char *key;
  94
  95                 key = strjoin(section, ".", lvalue);
  96                 if (!key)
  97                         return -ENOMEM;
  98
  99                 p = lookup(key, strlen(key));
 100                 free(key);
 101         }
 102
 103         if (!p)
 104                 return 0;
 105
 106         *func = p->parse;
 107         *ltype = p->ltype;
 108         *data = (uint8_t*) userdata + p->offset;
 109         return 1;
 110 }
 111
 112 /* Run the user supplied parser for an assignment */
 113 static int next_assignment(
 114                 const char *unit,
 115                 const char *filename,
 116                 unsigned line,
 117                 ConfigItemLookup lookup,
 118                 const void *table,
 119                 const char *section,
 120                 unsigned section_line,
 121                 const char *lvalue,
 122                 const char *rvalue,
 123                 ConfigParseFlags flags,
 124                 void *userdata) {
 125
 126         ConfigParserCallback func = NULL;
 127         int ltype = 0;
 128         void *data = NULL;
 129         int r;
 130
 131         assert(filename);
 132         assert(line > 0);
 133         assert(lookup);
 134         assert(lvalue);
 135         assert(rvalue);
 136
 137         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 138         if (r < 0)
 139                 return r;
 140
 141         if (r > 0) {
 142                 if (func)
 143                         return func(unit, filename, line, section, section_line,
 144                                     lvalue, ltype, rvalue, data, userdata);
 145
 146                 return 0;
 147         }
 148
 149         /* Warn about unknown non-extension fields. */
 150         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(lvalue, "X-"))
 151                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 152
 153         return 0;
 154 }
 155
 156 /* Parse a single logical line */
 157 static int parse_line(
 158                 const char* unit,
 159                 const char *filename,
 160                 unsigned line,
 161                 const char *sections,
 162                 ConfigItemLookup lookup,
 163                 const void *table,
 164                 ConfigParseFlags flags,
 165                 char **section,
 166                 unsigned *section_line,
 167                 bool *section_ignored,
 168                 char *l,
 169                 void *userdata) {
 170
 171         char *e, *include;
 172
 173         assert(filename);
 174         assert(line > 0);
 175         assert(lookup);
 176         assert(l);
 177
 178         l = strstrip(l);
 179         if (!*l)
 180                 return 0;
 181
 182         if (strchr(COMMENTS "\n", *l))
 183                 return 0;
 184
 185         include = first_word(l, ".include");
 186         if (include) {
 187                 _cleanup_free_ char *fn = NULL;
 188
 189                 /* .includes are a bad idea, we only support them here
 190                  * for historical reasons. They create cyclic include
 191                  * problems and make it difficult to detect
 192                  * configuration file changes with an easy
 193                  * stat(). Better approaches, such as .d/ drop-in
 194                  * snippets exist.
 195                  *
 196                  * Support for them should be eventually removed. */
 197
 198                 if (!(flags & CONFIG_PARSE_ALLOW_INCLUDE)) {
 199                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 200                         return 0;
 201                 }
 202
 203                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 204                            ".include directives are deprecated, and support for them will be removed in a future version of systemd. "
 205                            "Please use drop-in files instead.");
 206
 207                 fn = file_in_same_dir(filename, strstrip(include));
 208                 if (!fn)
 209                         return -ENOMEM;
 210
 211                 return config_parse(unit, fn, NULL, sections, lookup, table, flags, userdata);
 212         }
 213
 214         if (*l == '[') {
 215                 size_t k;
 216                 char *n;
 217
 218                 k = strlen(l);
 219                 assert(k > 0);
 220
 221                 if (l[k-1] != ']') {
 222                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid section header '%s'", l);
 223                         return -EBADMSG;
 224                 }
 225
 226                 n = strndup(l+1, k-2);
 227                 if (!n)
 228                         return -ENOMEM;
 229
 230                 if (sections && !nulstr_contains(sections, n)) {
 231
 232                         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(n, "X-"))
 233                                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown section '%s'. Ignoring.", n);
 234
 235                         free(n);
 236                         *section = mfree(*section);
 237                         *section_line = 0;
 238                         *section_ignored = true;
 239                 } else {
 240                         free(*section);
 241                         *section = n;
 242                         *section_line = line;
 243                         *section_ignored = false;
 244                 }
 245
 246                 return 0;
 247         }
 248
 249         if (sections && !*section) {
 250
 251                 if (!(flags & CONFIG_PARSE_RELAXED) && !*section_ignored)
 252                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 253
 254                 return 0;
 255         }
 256
 257         e = strchr(l, '=');
 258         if (!e) {
 259                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 260                 return -EINVAL;
 261         }
 262
 263         *e = 0;
 264         e++;
 265
 266         return next_assignment(unit,
 267                                filename,
 268                                line,
 269                                lookup,
 270                                table,
 271                                *section,
 272                                *section_line,
 273                                strstrip(l),
 274                                strstrip(e),
 275                                flags,
 276                                userdata);
 277 }
 278
 279 /* Go through the file and parse each line */
 280 int config_parse(const char *unit,
 281                  const char *filename,
 282                  FILE *f,
 283                  const char *sections,
 284                  ConfigItemLookup lookup,
 285                  const void *table,
 286                  ConfigParseFlags flags,
 287                  void *userdata) {
 288
 289         _cleanup_free_ char *section = NULL, *continuation = NULL;
 290         _cleanup_fclose_ FILE *ours = NULL;
 291         unsigned line = 0, section_line = 0;
 292         bool section_ignored = false;
 293         int r;
 294
 295         assert(filename);
 296         assert(lookup);
 297
 298         if (!f) {
 299                 f = ours = fopen(filename, "re");
 300                 if (!f) {
 301                         /* Only log on request, except for ENOENT,
 302                          * since we return 0 to the caller. */
 303                         if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
 304                                 log_full(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
 305                                          "Failed to open configuration file '%s': %m", filename);
 306                         return errno == ENOENT ? 0 : -errno;
 307                 }
 308         }
 309
 310         fd_warn_permissions(filename, fileno(f));
 311
 312         for (;;) {
 313                 _cleanup_free_ char *buf = NULL;
 314                 bool escaped = false;
 315                 char *l, *p, *e;
 316
 317                 r = read_line(f, LONG_LINE_MAX, &buf);
 318                 if (r == 0)
 319                         break;
 320                 if (r == -ENOBUFS) {
 321                         if (flags & CONFIG_PARSE_WARN)
 322                                 log_error_errno(r, "%s:%u: Line too long", filename, line);
 323
 324                         return r;
 325                 }
 326                 if (r < 0) {
 327                         if (CONFIG_PARSE_WARN)
 328                                 log_error_errno(r, "%s:%u: Error while reading configuration file: %m", filename, line);
 329
 330                         return r;
 331                 }
 332
 333                 l = buf;
 334                 if (!(flags & CONFIG_PARSE_REFUSE_BOM)) {
 335                         char *q;
 336
 337                         q = startswith(buf, UTF8_BYTE_ORDER_MARK);
 338                         if (q) {
 339                                 l = q;
 340                                 flags |= CONFIG_PARSE_REFUSE_BOM;
 341                         }
 342                 }
 343
 344                 if (continuation) {
 345                         if (strlen(continuation) + strlen(l) > LONG_LINE_MAX) {
 346                                 if (flags & CONFIG_PARSE_WARN)
 347                                         log_error("%s:%u: Continuation line too long", filename, line);
 348                                 return -ENOBUFS;
 349                         }
 350
 351                         if (!strextend(&continuation, l, NULL)) {
 352                                 if (flags & CONFIG_PARSE_WARN)
 353                                         log_oom();
 354                                 return -ENOMEM;
 355                         }
 356
 357                         p = continuation;
 358                 } else
 359                         p = l;
 360
 361                 for (e = p; *e; e++) {
 362                         if (escaped)
 363                                 escaped = false;
 364                         else if (*e == '\\')
 365                                 escaped = true;
 366                 }
 367
 368                 if (escaped) {
 369                         *(e-1) = ' ';
 370
 371                         if (!continuation) {
 372                                 continuation = strdup(l);
 373                                 if (!continuation) {
 374                                         if (flags & CONFIG_PARSE_WARN)
 375                                                 log_oom();
 376                                         return -ENOMEM;
 377                                 }
 378                         }
 379
 380                         continue;
 381                 }
 382
 383                 r = parse_line(unit,
 384                                filename,
 385                                ++line,
 386                                sections,
 387                                lookup,
 388                                table,
 389                                flags,
 390                                &section,
 391                                &section_line,
 392                                &section_ignored,
 393                                p,
 394                                userdata);
 395                 if (r < 0) {
 396                         if (flags & CONFIG_PARSE_WARN)
 397                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 398                         return r;
 399
 400                 }
 401
 402                 continuation = mfree(continuation);
 403         }
 404
 405         if (continuation) {
 406                 r = parse_line(unit,
 407                                filename,
 408                                ++line,
 409                                sections,
 410                                lookup,
 411                                table,
 412                                flags,
 413                                &section,
 414                                &section_line,
 415                                &section_ignored,
 416                                continuation,
 417                                userdata);
 418                 if (r < 0) {
 419                         if (flags & CONFIG_PARSE_WARN)
 420                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 421                         return r;
 422
 423                 }
 424         }
 425
 426         return 0;
 427 }
 428
 429 static int config_parse_many_files(
 430                 const char *conf_file,
 431                 char **files,
 432                 const char *sections,
 433                 ConfigItemLookup lookup,
 434                 const void *table,
 435                 ConfigParseFlags flags,
 436                 void *userdata) {
 437
 438         char **fn;
 439         int r;
 440
 441         if (conf_file) {
 442                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, flags, userdata);
 443                 if (r < 0)
 444                         return r;
 445         }
 446
 447         STRV_FOREACH(fn, files) {
 448                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata);
 449                 if (r < 0)
 450                         return r;
 451         }
 452
 453         return 0;
 454 }
 455
 456 /* Parse each config file in the directories specified as nulstr. */
 457 int config_parse_many_nulstr(
 458                 const char *conf_file,
 459                 const char *conf_file_dirs,
 460                 const char *sections,
 461                 ConfigItemLookup lookup,
 462                 const void *table,
 463                 ConfigParseFlags flags,
 464                 void *userdata) {
 465
 466         _cleanup_strv_free_ char **files = NULL;
 467         int r;
 468
 469         r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 470         if (r < 0)
 471                 return r;
 472
 473         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 474 }
 475
 476 /* Parse each config file in the directories specified as strv. */
 477 int config_parse_many(
 478                 const char *conf_file,
 479                 const char* const* conf_file_dirs,
 480                 const char *dropin_dirname,
 481                 const char *sections,
 482                 ConfigItemLookup lookup,
 483                 const void *table,
 484                 ConfigParseFlags flags,
 485                 void *userdata) {
 486
 487         _cleanup_strv_free_ char **dropin_dirs = NULL;
 488         _cleanup_strv_free_ char **files = NULL;
 489         const char *suffix;
 490         int r;
 491
 492         suffix = strjoina("/", dropin_dirname);
 493         r = strv_extend_strv_concat(&dropin_dirs, (char**) conf_file_dirs, suffix);
 494         if (r < 0)
 495                 return r;
 496
 497         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char* const*) dropin_dirs);
 498         if (r < 0)
 499                 return r;
 500
 501         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 502 }
 503
 504 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 505         DEFINE_CONFIG_PARSE_PTR(config_parse_##type, conv_func, vartype, "Failed to parse " #type " value")
 506
 507 DEFINE_PARSER(int, int, safe_atoi);
 508 DEFINE_PARSER(long, long, safe_atoli);
 509 DEFINE_PARSER(uint8, uint8_t, safe_atou8);
 510 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 511 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 512 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 513 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 514 DEFINE_PARSER(double, double, safe_atod);
 515 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 516 DEFINE_PARSER(sec, usec_t, parse_sec);
 517 DEFINE_PARSER(mode, mode_t, parse_mode);
 518
 519 int config_parse_iec_size(const char* unit,
 520                             const char *filename,
 521                             unsigned line,
 522                             const char *section,
 523                             unsigned section_line,
 524                             const char *lvalue,
 525                             int ltype,
 526                             const char *rvalue,
 527                             void *data,
 528                             void *userdata) {
 529
 530         size_t *sz = data;
 531         uint64_t v;
 532         int r;
 533
 534         assert(filename);
 535         assert(lvalue);
 536         assert(rvalue);
 537         assert(data);
 538
 539         r = parse_size(rvalue, 1024, &v);
 540         if (r < 0 || (uint64_t) (size_t) v != v) {
 541                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 542                 return 0;
 543         }
 544
 545         *sz = (size_t) v;
 546         return 0;
 547 }
 548
 549 int config_parse_si_size(
 550                 const char* unit,
 551                 const char *filename,
 552                 unsigned line,
 553                 const char *section,
 554                 unsigned section_line,
 555                 const char *lvalue,
 556                 int ltype,
 557                 const char *rvalue,
 558                 void *data,
 559                 void *userdata) {
 560
 561         size_t *sz = data;
 562         uint64_t v;
 563         int r;
 564
 565         assert(filename);
 566         assert(lvalue);
 567         assert(rvalue);
 568         assert(data);
 569
 570         r = parse_size(rvalue, 1000, &v);
 571         if (r < 0 || (uint64_t) (size_t) v != v) {
 572                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 573                 return 0;
 574         }
 575
 576         *sz = (size_t) v;
 577         return 0;
 578 }
 579
 580 int config_parse_iec_uint64(
 581                 const char* unit,
 582                 const char *filename,
 583                 unsigned line,
 584                 const char *section,
 585                 unsigned section_line,
 586                 const char *lvalue,
 587                 int ltype,
 588                 const char *rvalue,
 589                 void *data,
 590                 void *userdata) {
 591
 592         uint64_t *bytes = data;
 593         int r;
 594
 595         assert(filename);
 596         assert(lvalue);
 597         assert(rvalue);
 598         assert(data);
 599
 600         r = parse_size(rvalue, 1024, bytes);
 601         if (r < 0)
 602                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 603
 604         return 0;
 605 }
 606
 607 int config_parse_bool(const char* unit,
 608                       const char *filename,
 609                       unsigned line,
 610                       const char *section,
 611                       unsigned section_line,
 612                       const char *lvalue,
 613                       int ltype,
 614                       const char *rvalue,
 615                       void *data,
 616                       void *userdata) {
 617
 618         int k;
 619         bool *b = data;
 620         bool fatal = ltype;
 621
 622         assert(filename);
 623         assert(lvalue);
 624         assert(rvalue);
 625         assert(data);
 626
 627         k = parse_boolean(rvalue);
 628         if (k < 0) {
 629                 log_syntax(unit, LOG_ERR, filename, line, k,
 630                            "Failed to parse boolean value%s: %s",
 631                            fatal ? "" : ", ignoring", rvalue);
 632                 return fatal ? -ENOEXEC : 0;
 633         }
 634
 635         *b = !!k;
 636         return 0;
 637 }
 638
 639 int config_parse_tristate(
 640                 const char* unit,
 641                 const char *filename,
 642                 unsigned line,
 643                 const char *section,
 644                 unsigned section_line,
 645                 const char *lvalue,
 646                 int ltype,
 647                 const char *rvalue,
 648                 void *data,
 649                 void *userdata) {
 650
 651         int k, *t = data;
 652
 653         assert(filename);
 654         assert(lvalue);
 655         assert(rvalue);
 656         assert(data);
 657
 658         /* A tristate is pretty much a boolean, except that it can
 659          * also take the special value -1, indicating "uninitialized",
 660          * much like NULL is for a pointer type. */
 661
 662         k = parse_boolean(rvalue);
 663         if (k < 0) {
 664                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 665                 return 0;
 666         }
 667
 668         *t = !!k;
 669         return 0;
 670 }
 671
 672 int config_parse_string(
 673                 const char *unit,
 674                 const char *filename,
 675                 unsigned line,
 676                 const char *section,
 677                 unsigned section_line,
 678                 const char *lvalue,
 679                 int ltype,
 680                 const char *rvalue,
 681                 void *data,
 682                 void *userdata) {
 683
 684         char **s = data;
 685
 686         assert(filename);
 687         assert(lvalue);
 688         assert(rvalue);
 689         assert(data);
 690
 691         if (!utf8_is_valid(rvalue)) {
 692                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 693                 return 0;
 694         }
 695
 696         if (free_and_strdup(s, empty_to_null(rvalue)) < 0)
 697                 return log_oom();
 698
 699         return 0;
 700 }
 701
 702 int config_parse_path(
 703                 const char *unit,
 704                 const char *filename,
 705                 unsigned line,
 706                 const char *section,
 707                 unsigned section_line,
 708                 const char *lvalue,
 709                 int ltype,
 710                 const char *rvalue,
 711                 void *data,
 712                 void *userdata) {
 713
 714         char **s = data, *n;
 715         bool fatal = ltype;
 716
 717         assert(filename);
 718         assert(lvalue);
 719         assert(rvalue);
 720         assert(data);
 721
 722         if (isempty(rvalue)) {
 723                 n = NULL;
 724                 goto finalize;
 725         }
 726
 727         if (!utf8_is_valid(rvalue)) {
 728                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 729                 return fatal ? -ENOEXEC : 0;
 730         }
 731
 732         if (!path_is_absolute(rvalue)) {
 733                 log_syntax(unit, LOG_ERR, filename, line, 0,
 734                            "Not an absolute path%s: %s",
 735                            fatal ? "" : ", ignoring", rvalue);
 736                 return fatal ? -ENOEXEC : 0;
 737         }
 738
 739         n = strdup(rvalue);
 740         if (!n)
 741                 return log_oom();
 742
 743         path_kill_slashes(n);
 744
 745 finalize:
 746         free(*s);
 747         *s = n;
 748
 749         return 0;
 750 }
 751
 752 int config_parse_strv(
 753                 const char *unit,
 754                 const char *filename,
 755                 unsigned line,
 756                 const char *section,
 757                 unsigned section_line,
 758                 const char *lvalue,
 759                 int ltype,
 760                 const char *rvalue,
 761                 void *data,
 762                 void *userdata) {
 763
 764         char ***sv = data;
 765         int r;
 766
 767         assert(filename);
 768         assert(lvalue);
 769         assert(rvalue);
 770         assert(data);
 771
 772         if (isempty(rvalue)) {
 773                 *sv = strv_free(*sv);
 774                 return 0;
 775         }
 776
 777         for (;;) {
 778                 char *word = NULL;
 779
 780                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES|EXTRACT_RETAIN_ESCAPE);
 781                 if (r == 0)
 782                         break;
 783                 if (r == -ENOMEM)
 784                         return log_oom();
 785                 if (r < 0) {
 786                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
 787                         break;
 788                 }
 789
 790                 if (!utf8_is_valid(word)) {
 791                         log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, word);
 792                         free(word);
 793                         continue;
 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 int config_parse_log_facility(
 840                 const char *unit,
 841                 const char *filename,
 842                 unsigned line,
 843                 const char *section,
 844                 unsigned section_line,
 845                 const char *lvalue,
 846                 int ltype,
 847                 const char *rvalue,
 848                 void *data,
 849                 void *userdata) {
 850
 851         int *o = data, x;
 852
 853         assert(filename);
 854         assert(lvalue);
 855         assert(rvalue);
 856         assert(data);
 857
 858         x = log_facility_unshifted_from_string(rvalue);
 859         if (x < 0) {
 860                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 861                 return 0;
 862         }
 863
 864         *o = (x << 3) | LOG_PRI(*o);
 865
 866         return 0;
 867 }
 868
 869 int config_parse_log_level(
 870                 const char *unit,
 871                 const char *filename,
 872                 unsigned line,
 873                 const char *section,
 874                 unsigned section_line,
 875                 const char *lvalue,
 876                 int ltype,
 877                 const char *rvalue,
 878                 void *data,
 879                 void *userdata) {
 880
 881         int *o = data, x;
 882
 883         assert(filename);
 884         assert(lvalue);
 885         assert(rvalue);
 886         assert(data);
 887
 888         x = log_level_from_string(rvalue);
 889         if (x < 0) {
 890                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 891                 return 0;
 892         }
 893
 894         if (*o < 0) /* if it wasn't initialized so far, assume zero facility */
 895                 *o = x;
 896         else
 897                 *o = (*o & LOG_FACMASK) | x;
 898
 899         return 0;
 900 }
 901
 902 int config_parse_signal(
 903                 const char *unit,
 904                 const char *filename,
 905                 unsigned line,
 906                 const char *section,
 907                 unsigned section_line,
 908                 const char *lvalue,
 909                 int ltype,
 910                 const char *rvalue,
 911                 void *data,
 912                 void *userdata) {
 913
 914         int *sig = data, r;
 915
 916         assert(filename);
 917         assert(lvalue);
 918         assert(rvalue);
 919         assert(sig);
 920
 921         r = signal_from_string(rvalue);
 922         if (r <= 0) {
 923                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 924                 return 0;
 925         }
 926
 927         *sig = r;
 928         return 0;
 929 }
 930
 931 int config_parse_personality(
 932                 const char *unit,
 933                 const char *filename,
 934                 unsigned line,
 935                 const char *section,
 936                 unsigned section_line,
 937                 const char *lvalue,
 938                 int ltype,
 939                 const char *rvalue,
 940                 void *data,
 941                 void *userdata) {
 942
 943         unsigned long *personality = data, p;
 944
 945         assert(filename);
 946         assert(lvalue);
 947         assert(rvalue);
 948         assert(personality);
 949
 950         if (isempty(rvalue))
 951                 p = PERSONALITY_INVALID;
 952         else {
 953                 p = personality_from_string(rvalue);
 954                 if (p == PERSONALITY_INVALID) {
 955                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
 956                         return 0;
 957                 }
 958         }
 959
 960         *personality = p;
 961         return 0;
 962 }
 963
 964 int config_parse_ifname(
 965                 const char *unit,
 966                 const char *filename,
 967                 unsigned line,
 968                 const char *section,
 969                 unsigned section_line,
 970                 const char *lvalue,
 971                 int ltype,
 972                 const char *rvalue,
 973                 void *data,
 974                 void *userdata) {
 975
 976         char **s = data;
 977         int r;
 978
 979         assert(filename);
 980         assert(lvalue);
 981         assert(rvalue);
 982         assert(data);
 983
 984         if (isempty(rvalue)) {
 985                 *s = mfree(*s);
 986                 return 0;
 987         }
 988
 989         if (!ifname_valid(rvalue)) {
 990                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
 991                 return 0;
 992         }
 993
 994         r = free_and_strdup(s, rvalue);
 995         if (r < 0)
 996                 return log_oom();
 997
 998         return 0;
 999 }
1000
1001 int config_parse_ip_port(
1002                 const char *unit,
1003                 const char *filename,
1004                 unsigned line,
1005                 const char *section,
1006                 unsigned section_line,
1007                 const char *lvalue,
1008                 int ltype,
1009                 const char *rvalue,
1010                 void *data,
1011                 void *userdata) {
1012
1013         uint16_t *s = data;
1014         uint16_t port;
1015         int r;
1016
1017         assert(filename);
1018         assert(lvalue);
1019         assert(rvalue);
1020         assert(data);
1021
1022         if (isempty(rvalue)) {
1023                 *s = 0;
1024                 return 0;
1025         }
1026
1027         r = parse_ip_port(rvalue, &port);
1028         if (r < 0) {
1029                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse port '%s'.", rvalue);
1030                 return 0;
1031         }
1032
1033         *s = port;
1034
1035         return 0;
1036 }
1037
1038 int config_parse_join_controllers(
1039                 const char *unit,
1040                 const char *filename,
1041                 unsigned line,
1042                 const char *section,
1043                 unsigned section_line,
1044                 const char *lvalue,
1045                 int ltype,
1046                 const char *rvalue,
1047                 void *data,
1048                 void *userdata) {
1049
1050         char ****ret = data;
1051         const char *whole_rvalue = rvalue;
1052         unsigned n = 0;
1053         _cleanup_(strv_free_freep) char ***controllers = NULL;
1054
1055         assert(filename);
1056         assert(lvalue);
1057         assert(rvalue);
1058         assert(ret);
1059
1060         for (;;) {
1061                 _cleanup_free_ char *word = NULL;
1062                 char **l;
1063                 int r;
1064
1065                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1066                 if (r < 0) {
1067                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1068                         return r;
1069                 }
1070                 if (r == 0)
1071                         break;
1072
1073                 l = strv_split(word, ",");
1074                 if (!l)
1075                         return log_oom();
1076                 strv_uniq(l);
1077
1078                 if (strv_length(l) <= 1) {
1079                         strv_free(l);
1080                         continue;
1081                 }
1082
1083                 if (!controllers) {
1084                         controllers = new(char**, 2);
1085                         if (!controllers) {
1086                                 strv_free(l);
1087                                 return log_oom();
1088                         }
1089
1090                         controllers[0] = l;
1091                         controllers[1] = NULL;
1092
1093                         n = 1;
1094                 } else {
1095                         char ***a;
1096                         char ***t;
1097
1098                         t = new0(char**, n+2);
1099                         if (!t) {
1100                                 strv_free(l);
1101                                 return log_oom();
1102                         }
1103
1104                         n = 0;
1105
1106                         for (a = controllers; *a; a++)
1107                                 if (strv_overlap(*a, l)) {
1108                                         if (strv_extend_strv(&l, *a, false) < 0) {
1109                                                 strv_free(l);
1110                                                 strv_free_free(t);
1111                                                 return log_oom();
1112                                         }
1113
1114                                 } else {
1115                                         char **c;
1116
1117                                         c = strv_copy(*a);
1118                                         if (!c) {
1119                                                 strv_free(l);
1120                                                 strv_free_free(t);
1121                                                 return log_oom();
1122                                         }
1123
1124                                         t[n++] = c;
1125                                 }
1126
1127                         t[n++] = strv_uniq(l);
1128
1129                         strv_free_free(controllers);
1130                         controllers = t;
1131                 }
1132         }
1133         if (!isempty(rvalue))
1134                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1135
1136         /* As a special case, return a single empty strv, to override the default */
1137         if (!controllers) {
1138                 controllers = new(char**, 2);
1139                 if (!controllers)
1140                         return log_oom();
1141                 controllers[0] = strv_new(NULL, NULL);
1142                 if (!controllers[0])
1143                         return log_oom();
1144                 controllers[1] = NULL;
1145         }
1146
1147         strv_free_free(*ret);
1148         *ret = TAKE_PTR(controllers);
1149
1150         return 0;
1151 }
1152
1153 int config_parse_mtu(
1154                 const char *unit,
1155                 const char *filename,
1156                 unsigned line,
1157                 const char *section,
1158                 unsigned section_line,
1159                 const char *lvalue,
1160                 int ltype,
1161                 const char *rvalue,
1162                 void *data,
1163                 void *userdata) {
1164
1165         uint32_t *mtu = data;
1166         int r;
1167
1168         assert(rvalue);
1169         assert(mtu);
1170
1171         r = parse_mtu(ltype, rvalue, mtu);
1172         if (r == -ERANGE) {
1173                 log_syntax(unit, LOG_ERR, filename, line, r,
1174                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1175                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1176                            rvalue);
1177                 return 0;
1178         }
1179         if (r < 0) {
1180                 log_syntax(unit, LOG_ERR, filename, line, r,
1181                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1182                 return 0;
1183         }
1184
1185         return 0;
1186 }
1187
1188 int config_parse_rlimit(
1189                 const char *unit,
1190                 const char *filename,
1191                 unsigned line,
1192                 const char *section,
1193                 unsigned section_line,
1194                 const char *lvalue,
1195                 int ltype,
1196                 const char *rvalue,
1197                 void *data,
1198                 void *userdata) {
1199
1200         struct rlimit **rl = data, d = {};
1201         int r;
1202
1203         assert(rvalue);
1204         assert(rl);
1205
1206         r = rlimit_parse(ltype, rvalue, &d);
1207         if (r == -EILSEQ) {
1208                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1209                 return 0;
1210         }
1211         if (r < 0) {
1212                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1213                 return 0;
1214         }
1215
1216         if (rl[ltype])
1217                 *rl[ltype] = d;
1218         else {
1219                 rl[ltype] = newdup(struct rlimit, &d, 1);
1220                 if (!rl[ltype])
1221                         return log_oom();
1222         }
1223
1224         return 0;
1225 }