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 #include "rlimit-util.h"
  32
  33 int config_item_table_lookup(
  34                 const void *table,
  35                 const char *section,
  36                 const char *lvalue,
  37                 ConfigParserCallback *func,
  38                 int *ltype,
  39                 void **data,
  40                 void *userdata) {
  41
  42         const ConfigTableItem *t;
  43
  44         assert(table);
  45         assert(lvalue);
  46         assert(func);
  47         assert(ltype);
  48         assert(data);
  49
  50         for (t = table; t->lvalue; t++) {
  51
  52                 if (!streq(lvalue, t->lvalue))
  53                         continue;
  54
  55                 if (!streq_ptr(section, t->section))
  56                         continue;
  57
  58                 *func = t->parse;
  59                 *ltype = t->ltype;
  60                 *data = t->data;
  61                 return 1;
  62         }
  63
  64         return 0;
  65 }
  66
  67 int config_item_perf_lookup(
  68                 const void *table,
  69                 const char *section,
  70                 const char *lvalue,
  71                 ConfigParserCallback *func,
  72                 int *ltype,
  73                 void **data,
  74                 void *userdata) {
  75
  76         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  77         const ConfigPerfItem *p;
  78
  79         assert(table);
  80         assert(lvalue);
  81         assert(func);
  82         assert(ltype);
  83         assert(data);
  84
  85         if (!section)
  86                 p = lookup(lvalue, strlen(lvalue));
  87         else {
  88                 char *key;
  89
  90                 key = strjoin(section, ".", lvalue);
  91                 if (!key)
  92                         return -ENOMEM;
  93
  94                 p = lookup(key, strlen(key));
  95                 free(key);
  96         }
  97
  98         if (!p)
  99                 return 0;
 100
 101         *func = p->parse;
 102         *ltype = p->ltype;
 103         *data = (uint8_t*) userdata + p->offset;
 104         return 1;
 105 }
 106
 107 /* Run the user supplied parser for an assignment */
 108 static int next_assignment(
 109                 const char *unit,
 110                 const char *filename,
 111                 unsigned line,
 112                 ConfigItemLookup lookup,
 113                 const void *table,
 114                 const char *section,
 115                 unsigned section_line,
 116                 const char *lvalue,
 117                 const char *rvalue,
 118                 ConfigParseFlags flags,
 119                 void *userdata) {
 120
 121         ConfigParserCallback func = NULL;
 122         int ltype = 0;
 123         void *data = NULL;
 124         int r;
 125
 126         assert(filename);
 127         assert(line > 0);
 128         assert(lookup);
 129         assert(lvalue);
 130         assert(rvalue);
 131
 132         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 133         if (r < 0)
 134                 return r;
 135
 136         if (r > 0) {
 137                 if (func)
 138                         return func(unit, filename, line, section, section_line,
 139                                     lvalue, ltype, rvalue, data, userdata);
 140
 141                 return 0;
 142         }
 143
 144         /* Warn about unknown non-extension fields. */
 145         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(lvalue, "X-"))
 146                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 147
 148         return 0;
 149 }
 150
 151 /* Parse a single logical line */
 152 static int parse_line(
 153                 const char* unit,
 154                 const char *filename,
 155                 unsigned line,
 156                 const char *sections,
 157                 ConfigItemLookup lookup,
 158                 const void *table,
 159                 ConfigParseFlags flags,
 160                 char **section,
 161                 unsigned *section_line,
 162                 bool *section_ignored,
 163                 char *l,
 164                 void *userdata) {
 165
 166         char *e, *include;
 167
 168         assert(filename);
 169         assert(line > 0);
 170         assert(lookup);
 171         assert(l);
 172
 173         l = strstrip(l);
 174         if (!*l)
 175                 return 0;
 176
 177         if (strchr(COMMENTS "\n", *l))
 178                 return 0;
 179
 180         include = first_word(l, ".include");
 181         if (include) {
 182                 _cleanup_free_ char *fn = NULL;
 183
 184                 /* .includes are a bad idea, we only support them here
 185                  * for historical reasons. They create cyclic include
 186                  * problems and make it difficult to detect
 187                  * configuration file changes with an easy
 188                  * stat(). Better approaches, such as .d/ drop-in
 189                  * snippets exist.
 190                  *
 191                  * Support for them should be eventually removed. */
 192
 193                 if (!(flags & CONFIG_PARSE_ALLOW_INCLUDE)) {
 194                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 195                         return 0;
 196                 }
 197
 198                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 199                            ".include directives are deprecated, and support for them will be removed in a future version of systemd. "
 200                            "Please use drop-in files instead.");
 201
 202                 fn = file_in_same_dir(filename, strstrip(include));
 203                 if (!fn)
 204                         return -ENOMEM;
 205
 206                 return config_parse(unit, fn, NULL, sections, lookup, table, flags, userdata);
 207         }
 208
 209         if (!utf8_is_valid(l))
 210                 return log_syntax_invalid_utf8(unit, LOG_WARNING, filename, line, l);
 211
 212         if (*l == '[') {
 213                 size_t k;
 214                 char *n;
 215
 216                 k = strlen(l);
 217                 assert(k > 0);
 218
 219                 if (l[k-1] != ']') {
 220                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid section header '%s'", l);
 221                         return -EBADMSG;
 222                 }
 223
 224                 n = strndup(l+1, k-2);
 225                 if (!n)
 226                         return -ENOMEM;
 227
 228                 if (sections && !nulstr_contains(sections, n)) {
 229
 230                         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(n, "X-"))
 231                                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown section '%s'. Ignoring.", n);
 232
 233                         free(n);
 234                         *section = mfree(*section);
 235                         *section_line = 0;
 236                         *section_ignored = true;
 237                 } else {
 238                         free_and_replace(*section, n);
 239                         *section_line = line;
 240                         *section_ignored = false;
 241                 }
 242
 243                 return 0;
 244         }
 245
 246         if (sections && !*section) {
 247
 248                 if (!(flags & CONFIG_PARSE_RELAXED) && !*section_ignored)
 249                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 250
 251                 return 0;
 252         }
 253
 254         e = strchr(l, '=');
 255         if (!e) {
 256                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 257                 return -EINVAL;
 258         }
 259
 260         *e = 0;
 261         e++;
 262
 263         return next_assignment(unit,
 264                                filename,
 265                                line,
 266                                lookup,
 267                                table,
 268                                *section,
 269                                *section_line,
 270                                strstrip(l),
 271                                strstrip(e),
 272                                flags,
 273                                userdata);
 274 }
 275
 276 /* Go through the file and parse each line */
 277 int config_parse(const char *unit,
 278                  const char *filename,
 279                  FILE *f,
 280                  const char *sections,
 281                  ConfigItemLookup lookup,
 282                  const void *table,
 283                  ConfigParseFlags flags,
 284                  void *userdata) {
 285
 286         _cleanup_free_ char *section = NULL, *continuation = NULL;
 287         _cleanup_fclose_ FILE *ours = NULL;
 288         unsigned line = 0, section_line = 0;
 289         bool section_ignored = false;
 290         int r;
 291
 292         assert(filename);
 293         assert(lookup);
 294
 295         if (!f) {
 296                 f = ours = fopen(filename, "re");
 297                 if (!f) {
 298                         /* Only log on request, except for ENOENT,
 299                          * since we return 0 to the caller. */
 300                         if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
 301                                 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno,
 302                                                "Failed to open configuration file '%s': %m", filename);
 303                         return errno == ENOENT ? 0 : -errno;
 304                 }
 305         }
 306
 307         fd_warn_permissions(filename, fileno(f));
 308
 309         for (;;) {
 310                 _cleanup_free_ char *buf = NULL;
 311                 bool escaped = false;
 312                 char *l, *p, *e;
 313
 314                 r = read_line(f, LONG_LINE_MAX, &buf);
 315                 if (r == 0)
 316                         break;
 317                 if (r == -ENOBUFS) {
 318                         if (flags & CONFIG_PARSE_WARN)
 319                                 log_error_errno(r, "%s:%u: Line too long", filename, line);
 320
 321                         return r;
 322                 }
 323                 if (r < 0) {
 324                         if (CONFIG_PARSE_WARN)
 325                                 log_error_errno(r, "%s:%u: Error while reading configuration file: %m", filename, line);
 326
 327                         return r;
 328                 }
 329
 330                 l = buf;
 331                 if (!(flags & CONFIG_PARSE_REFUSE_BOM)) {
 332                         char *q;
 333
 334                         q = startswith(buf, UTF8_BYTE_ORDER_MARK);
 335                         if (q) {
 336                                 l = q;
 337                                 flags |= CONFIG_PARSE_REFUSE_BOM;
 338                         }
 339                 }
 340
 341                 if (continuation) {
 342                         if (strlen(continuation) + strlen(l) > LONG_LINE_MAX) {
 343                                 if (flags & CONFIG_PARSE_WARN)
 344                                         log_error("%s:%u: Continuation line too long", filename, line);
 345                                 return -ENOBUFS;
 346                         }
 347
 348                         if (!strextend(&continuation, l, NULL)) {
 349                                 if (flags & CONFIG_PARSE_WARN)
 350                                         log_oom();
 351                                 return -ENOMEM;
 352                         }
 353
 354                         p = continuation;
 355                 } else
 356                         p = l;
 357
 358                 for (e = p; *e; e++) {
 359                         if (escaped)
 360                                 escaped = false;
 361                         else if (*e == '\\')
 362                                 escaped = true;
 363                 }
 364
 365                 if (escaped) {
 366                         *(e-1) = ' ';
 367
 368                         if (!continuation) {
 369                                 continuation = strdup(l);
 370                                 if (!continuation) {
 371                                         if (flags & CONFIG_PARSE_WARN)
 372                                                 log_oom();
 373                                         return -ENOMEM;
 374                                 }
 375                         }
 376
 377                         continue;
 378                 }
 379
 380                 r = parse_line(unit,
 381                                filename,
 382                                ++line,
 383                                sections,
 384                                lookup,
 385                                table,
 386                                flags,
 387                                &section,
 388                                &section_line,
 389                                &section_ignored,
 390                                p,
 391                                userdata);
 392                 if (r < 0) {
 393                         if (flags & CONFIG_PARSE_WARN)
 394                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 395                         return r;
 396                 }
 397
 398                 continuation = mfree(continuation);
 399         }
 400
 401         if (continuation) {
 402                 r = parse_line(unit,
 403                                filename,
 404                                ++line,
 405                                sections,
 406                                lookup,
 407                                table,
 408                                flags,
 409                                &section,
 410                                &section_line,
 411                                &section_ignored,
 412                                continuation,
 413                                userdata);
 414                 if (r < 0) {
 415                         if (flags & CONFIG_PARSE_WARN)
 416                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 417                         return r;
 418                 }
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int config_parse_many_files(
 425                 const char *conf_file,
 426                 char **files,
 427                 const char *sections,
 428                 ConfigItemLookup lookup,
 429                 const void *table,
 430                 ConfigParseFlags flags,
 431                 void *userdata) {
 432
 433         char **fn;
 434         int r;
 435
 436         if (conf_file) {
 437                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, flags, userdata);
 438                 if (r < 0)
 439                         return r;
 440         }
 441
 442         STRV_FOREACH(fn, files) {
 443                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata);
 444                 if (r < 0)
 445                         return r;
 446         }
 447
 448         return 0;
 449 }
 450
 451 /* Parse each config file in the directories specified as nulstr. */
 452 int config_parse_many_nulstr(
 453                 const char *conf_file,
 454                 const char *conf_file_dirs,
 455                 const char *sections,
 456                 ConfigItemLookup lookup,
 457                 const void *table,
 458                 ConfigParseFlags flags,
 459                 void *userdata) {
 460
 461         _cleanup_strv_free_ char **files = NULL;
 462         int r;
 463
 464         r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 465         if (r < 0)
 466                 return r;
 467
 468         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 469 }
 470
 471 /* Parse each config file in the directories specified as strv. */
 472 int config_parse_many(
 473                 const char *conf_file,
 474                 const char* const* conf_file_dirs,
 475                 const char *dropin_dirname,
 476                 const char *sections,
 477                 ConfigItemLookup lookup,
 478                 const void *table,
 479                 ConfigParseFlags flags,
 480                 void *userdata) {
 481
 482         _cleanup_strv_free_ char **dropin_dirs = NULL;
 483         _cleanup_strv_free_ char **files = NULL;
 484         const char *suffix;
 485         int r;
 486
 487         suffix = strjoina("/", dropin_dirname);
 488         r = strv_extend_strv_concat(&dropin_dirs, (char**) conf_file_dirs, suffix);
 489         if (r < 0)
 490                 return r;
 491
 492         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char* const*) dropin_dirs);
 493         if (r < 0)
 494                 return r;
 495
 496         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 497 }
 498
 499 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 500         DEFINE_CONFIG_PARSE_PTR(config_parse_##type, conv_func, vartype, "Failed to parse " #type " value")
 501
 502 DEFINE_PARSER(int, int, safe_atoi);
 503 DEFINE_PARSER(long, long, safe_atoli);
 504 DEFINE_PARSER(uint8, uint8_t, safe_atou8);
 505 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 506 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 507 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 508 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 509 DEFINE_PARSER(double, double, safe_atod);
 510 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 511 DEFINE_PARSER(sec, usec_t, parse_sec);
 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_QUOTES|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_join_controllers(
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         char ****ret = data;
1026         const char *whole_rvalue = rvalue;
1027         unsigned n = 0;
1028         _cleanup_(strv_free_freep) char ***controllers = NULL;
1029
1030         assert(filename);
1031         assert(lvalue);
1032         assert(rvalue);
1033         assert(ret);
1034
1035         for (;;) {
1036                 _cleanup_free_ char *word = NULL;
1037                 char **l;
1038                 int r;
1039
1040                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1041                 if (r < 0) {
1042                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1043                         return r;
1044                 }
1045                 if (r == 0)
1046                         break;
1047
1048                 l = strv_split(word, ",");
1049                 if (!l)
1050                         return log_oom();
1051                 strv_uniq(l);
1052
1053                 if (strv_length(l) <= 1) {
1054                         strv_free(l);
1055                         continue;
1056                 }
1057
1058                 if (!controllers) {
1059                         controllers = new(char**, 2);
1060                         if (!controllers) {
1061                                 strv_free(l);
1062                                 return log_oom();
1063                         }
1064
1065                         controllers[0] = l;
1066                         controllers[1] = NULL;
1067
1068                         n = 1;
1069                 } else {
1070                         char ***a;
1071                         char ***t;
1072
1073                         t = new0(char**, n+2);
1074                         if (!t) {
1075                                 strv_free(l);
1076                                 return log_oom();
1077                         }
1078
1079                         n = 0;
1080
1081                         for (a = controllers; *a; a++)
1082                                 if (strv_overlap(*a, l)) {
1083                                         if (strv_extend_strv(&l, *a, false) < 0) {
1084                                                 strv_free(l);
1085                                                 strv_free_free(t);
1086                                                 return log_oom();
1087                                         }
1088
1089                                 } else {
1090                                         char **c;
1091
1092                                         c = strv_copy(*a);
1093                                         if (!c) {
1094                                                 strv_free(l);
1095                                                 strv_free_free(t);
1096                                                 return log_oom();
1097                                         }
1098
1099                                         t[n++] = c;
1100                                 }
1101
1102                         t[n++] = strv_uniq(l);
1103
1104                         strv_free_free(controllers);
1105                         controllers = t;
1106                 }
1107         }
1108         if (!isempty(rvalue))
1109                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1110
1111         /* As a special case, return a single empty strv, to override the default */
1112         if (!controllers) {
1113                 controllers = new(char**, 2);
1114                 if (!controllers)
1115                         return log_oom();
1116                 controllers[0] = strv_new(NULL, NULL);
1117                 if (!controllers[0])
1118                         return log_oom();
1119                 controllers[1] = NULL;
1120         }
1121
1122         strv_free_free(*ret);
1123         *ret = TAKE_PTR(controllers);
1124
1125         return 0;
1126 }
1127
1128 int config_parse_mtu(
1129                 const char *unit,
1130                 const char *filename,
1131                 unsigned line,
1132                 const char *section,
1133                 unsigned section_line,
1134                 const char *lvalue,
1135                 int ltype,
1136                 const char *rvalue,
1137                 void *data,
1138                 void *userdata) {
1139
1140         uint32_t *mtu = data;
1141         int r;
1142
1143         assert(rvalue);
1144         assert(mtu);
1145
1146         r = parse_mtu(ltype, rvalue, mtu);
1147         if (r == -ERANGE) {
1148                 log_syntax(unit, LOG_ERR, filename, line, r,
1149                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1150                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1151                            rvalue);
1152                 return 0;
1153         }
1154         if (r < 0) {
1155                 log_syntax(unit, LOG_ERR, filename, line, r,
1156                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1157                 return 0;
1158         }
1159
1160         return 0;
1161 }
1162
1163 int config_parse_rlimit(
1164                 const char *unit,
1165                 const char *filename,
1166                 unsigned line,
1167                 const char *section,
1168                 unsigned section_line,
1169                 const char *lvalue,
1170                 int ltype,
1171                 const char *rvalue,
1172                 void *data,
1173                 void *userdata) {
1174
1175         struct rlimit **rl = data, d = {};
1176         int r;
1177
1178         assert(rvalue);
1179         assert(rl);
1180
1181         r = rlimit_parse(ltype, rvalue, &d);
1182         if (r == -EILSEQ) {
1183                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1184                 return 0;
1185         }
1186         if (r < 0) {
1187                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1188                 return 0;
1189         }
1190
1191         if (rl[ltype])
1192                 *rl[ltype] = d;
1193         else {
1194                 rl[ltype] = newdup(struct rlimit, &d, 1);
1195                 if (!rl[ltype])
1196                         return log_oom();
1197         }
1198
1199         return 0;
1200 }
1201
1202 int config_parse_permille(const char* unit,
1203                           const char *filename,
1204                           unsigned line,
1205                           const char *section,
1206                           unsigned section_line,
1207                           const char *lvalue,
1208                           int ltype,
1209                           const char *rvalue,
1210                           void *data,
1211                           void *userdata) {
1212
1213         unsigned *permille = data;
1214         int r;
1215
1216         assert(filename);
1217         assert(lvalue);
1218         assert(rvalue);
1219         assert(permille);
1220
1221         r = parse_permille(rvalue);
1222         if (r < 0) {
1223                 log_syntax(unit, LOG_ERR, filename, line, r,
1224                            "Failed to parse permille value, ignoring: %s", rvalue);
1225                 return 0;
1226         }
1227
1228         *permille = (unsigned) r;
1229
1230         return 0;
1231 }