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