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