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 //#include "rlimit-util.h"
  49 //#include "rlimit-util.h"
  50 //#include "rlimit-util.h"
  51 //#include "rlimit-util.h"
  52
  53 int config_item_table_lookup(
  54                 const void *table,
  55                 const char *section,
  56                 const char *lvalue,
  57                 ConfigParserCallback *func,
  58                 int *ltype,
  59                 void **data,
  60                 void *userdata) {
  61
  62         const ConfigTableItem *t;
  63
  64         assert(table);
  65         assert(lvalue);
  66         assert(func);
  67         assert(ltype);
  68         assert(data);
  69
  70         for (t = table; t->lvalue; t++) {
  71
  72                 if (!streq(lvalue, t->lvalue))
  73                         continue;
  74
  75                 if (!streq_ptr(section, t->section))
  76                         continue;
  77
  78                 *func = t->parse;
  79                 *ltype = t->ltype;
  80                 *data = t->data;
  81                 return 1;
  82         }
  83
  84         return 0;
  85 }
  86
  87 int config_item_perf_lookup(
  88                 const void *table,
  89                 const char *section,
  90                 const char *lvalue,
  91                 ConfigParserCallback *func,
  92                 int *ltype,
  93                 void **data,
  94                 void *userdata) {
  95
  96         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  97         const ConfigPerfItem *p;
  98
  99         assert(table);
 100         assert(lvalue);
 101         assert(func);
 102         assert(ltype);
 103         assert(data);
 104
 105         if (!section)
 106                 p = lookup(lvalue, strlen(lvalue));
 107         else {
 108                 char *key;
 109
 110                 key = strjoin(section, ".", lvalue);
 111                 if (!key)
 112                         return -ENOMEM;
 113
 114                 p = lookup(key, strlen(key));
 115                 free(key);
 116         }
 117
 118         if (!p)
 119                 return 0;
 120
 121         *func = p->parse;
 122         *ltype = p->ltype;
 123         *data = (uint8_t*) userdata + p->offset;
 124         return 1;
 125 }
 126
 127 /* Run the user supplied parser for an assignment */
 128 static int next_assignment(
 129                 const char *unit,
 130                 const char *filename,
 131                 unsigned line,
 132                 ConfigItemLookup lookup,
 133                 const void *table,
 134                 const char *section,
 135                 unsigned section_line,
 136                 const char *lvalue,
 137                 const char *rvalue,
 138                 ConfigParseFlags flags,
 139                 void *userdata) {
 140
 141         ConfigParserCallback func = NULL;
 142         int ltype = 0;
 143         void *data = NULL;
 144         int r;
 145
 146         assert(filename);
 147         assert(line > 0);
 148         assert(lookup);
 149         assert(lvalue);
 150         assert(rvalue);
 151
 152         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 153         if (r < 0)
 154                 return r;
 155
 156         if (r > 0) {
 157                 if (func)
 158                         return func(unit, filename, line, section, section_line,
 159                                     lvalue, ltype, rvalue, data, userdata);
 160
 161                 return 0;
 162         }
 163
 164         /* Warn about unknown non-extension fields. */
 165         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(lvalue, "X-"))
 166                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 167
 168         return 0;
 169 }
 170
 171 /* Parse a single logical line */
 172 static int parse_line(
 173                 const char* unit,
 174                 const char *filename,
 175                 unsigned line,
 176                 const char *sections,
 177                 ConfigItemLookup lookup,
 178                 const void *table,
 179                 ConfigParseFlags flags,
 180                 char **section,
 181                 unsigned *section_line,
 182                 bool *section_ignored,
 183                 char *l,
 184                 void *userdata) {
 185
 186         char *e, *include;
 187
 188         assert(filename);
 189         assert(line > 0);
 190         assert(lookup);
 191         assert(l);
 192
 193         l = strstrip(l);
 194         if (!*l)
 195                 return 0;
 196
 197         if (strchr(COMMENTS "\n", *l))
 198                 return 0;
 199
 200         include = first_word(l, ".include");
 201         if (include) {
 202                 _cleanup_free_ char *fn = NULL;
 203
 204                 /* .includes are a bad idea, we only support them here
 205                  * for historical reasons. They create cyclic include
 206                  * problems and make it difficult to detect
 207                  * configuration file changes with an easy
 208                  * stat(). Better approaches, such as .d/ drop-in
 209                  * snippets exist.
 210                  *
 211                  * Support for them should be eventually removed. */
 212
 213                 if (!(flags & CONFIG_PARSE_ALLOW_INCLUDE)) {
 214                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 215                         return 0;
 216                 }
 217
 218                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 219                            ".include directives are deprecated, and support for them will be removed in a future version of elogind. "
 220                            "Please use drop-in files instead.");
 221
 222                 fn = file_in_same_dir(filename, strstrip(include));
 223                 if (!fn)
 224                         return -ENOMEM;
 225
 226                 return config_parse(unit, fn, NULL, sections, lookup, table, flags, userdata);
 227         }
 228
 229         if (!utf8_is_valid(l))
 230                 return log_syntax_invalid_utf8(unit, LOG_WARNING, filename, line, l);
 231
 232         if (*l == '[') {
 233                 size_t k;
 234                 char *n;
 235
 236                 k = strlen(l);
 237                 assert(k > 0);
 238
 239                 if (l[k-1] != ']') {
 240                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid section header '%s'", l);
 241                         return -EBADMSG;
 242                 }
 243
 244                 n = strndup(l+1, k-2);
 245                 if (!n)
 246                         return -ENOMEM;
 247
 248                 if (sections && !nulstr_contains(sections, n)) {
 249
 250                         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(n, "X-"))
 251                                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown section '%s'. Ignoring.", n);
 252
 253                         free(n);
 254                         *section = mfree(*section);
 255                         *section_line = 0;
 256                         *section_ignored = true;
 257                 } else {
 258                         free_and_replace(*section, n);
 259                         *section_line = line;
 260                         *section_ignored = false;
 261                 }
 262
 263                 return 0;
 264         }
 265
 266         if (sections && !*section) {
 267
 268                 if (!(flags & CONFIG_PARSE_RELAXED) && !*section_ignored)
 269                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 270
 271                 return 0;
 272         }
 273
 274         e = strchr(l, '=');
 275         if (!e) {
 276                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 277                 return -EINVAL;
 278         }
 279
 280         *e = 0;
 281         e++;
 282
 283         return next_assignment(unit,
 284                                filename,
 285                                line,
 286                                lookup,
 287                                table,
 288                                *section,
 289                                *section_line,
 290                                strstrip(l),
 291                                strstrip(e),
 292                                flags,
 293                                userdata);
 294 }
 295
 296 /* Go through the file and parse each line */
 297 int config_parse(const char *unit,
 298                  const char *filename,
 299                  FILE *f,
 300                  const char *sections,
 301                  ConfigItemLookup lookup,
 302                  const void *table,
 303                  ConfigParseFlags flags,
 304                  void *userdata) {
 305
 306         _cleanup_free_ char *section = NULL, *continuation = NULL;
 307         _cleanup_fclose_ FILE *ours = NULL;
 308         unsigned line = 0, section_line = 0;
 309         bool section_ignored = false;
 310         int r;
 311
 312         assert(filename);
 313         assert(lookup);
 314
 315         if (!f) {
 316                 f = ours = fopen(filename, "re");
 317                 if (!f) {
 318                         /* Only log on request, except for ENOENT,
 319                          * since we return 0 to the caller. */
 320                         if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
 321                                 log_full_errno(errno == ENOENT ? LOG_DEBUG : LOG_ERR, errno,
 322                                                "Failed to open configuration file '%s': %m", filename);
 323                         return errno == ENOENT ? 0 : -errno;
 324                 }
 325         }
 326
 327         fd_warn_permissions(filename, fileno(f));
 328
 329         for (;;) {
 330                 _cleanup_free_ char *buf = NULL;
 331                 bool escaped = false;
 332                 char *l, *p, *e;
 333
 334                 r = read_line(f, LONG_LINE_MAX, &buf);
 335                 if (r == 0)
 336                         break;
 337                 if (r == -ENOBUFS) {
 338                         if (flags & CONFIG_PARSE_WARN)
 339                                 log_error_errno(r, "%s:%u: Line too long", filename, line);
 340
 341                         return r;
 342                 }
 343                 if (r < 0) {
 344                         if (CONFIG_PARSE_WARN)
 345                                 log_error_errno(r, "%s:%u: Error while reading configuration file: %m", filename, line);
 346
 347                         return r;
 348                 }
 349
 350                 l = buf;
 351                 if (!(flags & CONFIG_PARSE_REFUSE_BOM)) {
 352                         char *q;
 353
 354                         q = startswith(buf, UTF8_BYTE_ORDER_MARK);
 355                         if (q) {
 356                                 l = q;
 357                                 flags |= CONFIG_PARSE_REFUSE_BOM;
 358                         }
 359                 }
 360
 361                 if (continuation) {
 362                         if (strlen(continuation) + strlen(l) > LONG_LINE_MAX) {
 363                                 if (flags & CONFIG_PARSE_WARN)
 364                                         log_error("%s:%u: Continuation line too long", filename, line);
 365                                 return -ENOBUFS;
 366                         }
 367
 368                         if (!strextend(&continuation, l, NULL)) {
 369                                 if (flags & CONFIG_PARSE_WARN)
 370                                         log_oom();
 371                                 return -ENOMEM;
 372                         }
 373
 374                         p = continuation;
 375                 } else
 376                         p = l;
 377
 378                 for (e = p; *e; e++) {
 379                         if (escaped)
 380                                 escaped = false;
 381                         else if (*e == '\\')
 382                                 escaped = true;
 383                 }
 384
 385                 if (escaped) {
 386                         *(e-1) = ' ';
 387
 388                         if (!continuation) {
 389                                 continuation = strdup(l);
 390                                 if (!continuation) {
 391                                         if (flags & CONFIG_PARSE_WARN)
 392                                                 log_oom();
 393                                         return -ENOMEM;
 394                                 }
 395                         }
 396
 397                         continue;
 398                 }
 399
 400                 r = parse_line(unit,
 401                                filename,
 402                                ++line,
 403                                sections,
 404                                lookup,
 405                                table,
 406                                flags,
 407                                &section,
 408                                &section_line,
 409                                &section_ignored,
 410                                p,
 411                                userdata);
 412                 if (r < 0) {
 413                         if (flags & CONFIG_PARSE_WARN)
 414                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 415                         return r;
 416                 }
 417
 418                 continuation = mfree(continuation);
 419         }
 420
 421         if (continuation) {
 422                 r = parse_line(unit,
 423                                filename,
 424                                ++line,
 425                                sections,
 426                                lookup,
 427                                table,
 428                                flags,
 429                                &section,
 430                                &section_line,
 431                                &section_ignored,
 432                                continuation,
 433                                userdata);
 434                 if (r < 0) {
 435                         if (flags & CONFIG_PARSE_WARN)
 436                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 437                         return r;
 438                 }
 439         }
 440
 441         return 0;
 442 }
 443
 444 static int config_parse_many_files(
 445                 const char *conf_file,
 446                 char **files,
 447                 const char *sections,
 448                 ConfigItemLookup lookup,
 449                 const void *table,
 450                 ConfigParseFlags flags,
 451                 void *userdata) {
 452
 453         char **fn;
 454         int r;
 455
 456         if (conf_file) {
 457                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, flags, userdata);
 458                 if (r < 0)
 459                         return r;
 460         }
 461
 462         STRV_FOREACH(fn, files) {
 463                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata);
 464                 if (r < 0)
 465                         return r;
 466         }
 467
 468         return 0;
 469 }
 470
 471 /* Parse each config file in the directories specified as nulstr. */
 472 int config_parse_many_nulstr(
 473                 const char *conf_file,
 474                 const char *conf_file_dirs,
 475                 const char *sections,
 476                 ConfigItemLookup lookup,
 477                 const void *table,
 478                 ConfigParseFlags flags,
 479                 void *userdata) {
 480
 481         _cleanup_strv_free_ char **files = NULL;
 482         int r;
 483
 484         r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 485         if (r < 0)
 486                 return r;
 487
 488         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 489 }
 490
 491 #if 0 /// UNNEEDED by elogind
 492 /* Parse each config file in the directories specified as strv. */
 493 int config_parse_many(
 494                 const char *conf_file,
 495                 const char* const* conf_file_dirs,
 496                 const char *dropin_dirname,
 497                 const char *sections,
 498                 ConfigItemLookup lookup,
 499                 const void *table,
 500                 ConfigParseFlags flags,
 501                 void *userdata) {
 502
 503         _cleanup_strv_free_ char **dropin_dirs = NULL;
 504         _cleanup_strv_free_ char **files = NULL;
 505         const char *suffix;
 506         int r;
 507
 508         suffix = strjoina("/", dropin_dirname);
 509         r = strv_extend_strv_concat(&dropin_dirs, (char**) conf_file_dirs, suffix);
 510         if (r < 0)
 511                 return r;
 512
 513         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char* const*) dropin_dirs);
 514         if (r < 0)
 515                 return r;
 516
 517         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 518 }
 519 #endif // 0
 520
 521 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 522         DEFINE_CONFIG_PARSE_PTR(config_parse_##type, conv_func, vartype, "Failed to parse " #type " value")
 523
 524 DEFINE_PARSER(int, int, safe_atoi);
 525 DEFINE_PARSER(long, long, safe_atoli);
 526 #if 0 /// UNNEEDED by elogind
 527 DEFINE_PARSER(uint8, uint8_t, safe_atou8);
 528 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 529 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 530 #endif // 0
 531 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 532 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 533 DEFINE_PARSER(double, double, safe_atod);
 534 #if 0 /// UNNEEDED by elogind
 535 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 536 #endif // 0
 537 DEFINE_PARSER(sec, usec_t, parse_sec);
 538 DEFINE_PARSER(mode, mode_t, parse_mode);
 539
 540 int config_parse_iec_size(const char* unit,
 541                             const char *filename,
 542                             unsigned line,
 543                             const char *section,
 544                             unsigned section_line,
 545                             const char *lvalue,
 546                             int ltype,
 547                             const char *rvalue,
 548                             void *data,
 549                             void *userdata) {
 550
 551         size_t *sz = data;
 552         uint64_t v;
 553         int r;
 554
 555         assert(filename);
 556         assert(lvalue);
 557         assert(rvalue);
 558         assert(data);
 559
 560         r = parse_size(rvalue, 1024, &v);
 561         if (r < 0 || (uint64_t) (size_t) v != v) {
 562                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 563                 return 0;
 564         }
 565
 566         *sz = (size_t) v;
 567         return 0;
 568 }
 569
 570 #if 0 /// UNNEEDED by elogind
 571 int config_parse_si_size(
 572                 const char* unit,
 573                 const char *filename,
 574                 unsigned line,
 575                 const char *section,
 576                 unsigned section_line,
 577                 const char *lvalue,
 578                 int ltype,
 579                 const char *rvalue,
 580                 void *data,
 581                 void *userdata) {
 582
 583         size_t *sz = data;
 584         uint64_t v;
 585         int r;
 586
 587         assert(filename);
 588         assert(lvalue);
 589         assert(rvalue);
 590         assert(data);
 591
 592         r = parse_size(rvalue, 1000, &v);
 593         if (r < 0 || (uint64_t) (size_t) v != v) {
 594                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 595                 return 0;
 596         }
 597
 598         *sz = (size_t) v;
 599         return 0;
 600 }
 601
 602 int config_parse_iec_uint64(
 603                 const char* unit,
 604                 const char *filename,
 605                 unsigned line,
 606                 const char *section,
 607                 unsigned section_line,
 608                 const char *lvalue,
 609                 int ltype,
 610                 const char *rvalue,
 611                 void *data,
 612                 void *userdata) {
 613
 614         uint64_t *bytes = data;
 615         int r;
 616
 617         assert(filename);
 618         assert(lvalue);
 619         assert(rvalue);
 620         assert(data);
 621
 622         r = parse_size(rvalue, 1024, bytes);
 623         if (r < 0)
 624                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 625
 626         return 0;
 627 }
 628 #endif // 0
 629
 630 int config_parse_bool(const char* unit,
 631                       const char *filename,
 632                       unsigned line,
 633                       const char *section,
 634                       unsigned section_line,
 635                       const char *lvalue,
 636                       int ltype,
 637                       const char *rvalue,
 638                       void *data,
 639                       void *userdata) {
 640
 641         int k;
 642         bool *b = data;
 643         bool fatal = ltype;
 644
 645         assert(filename);
 646         assert(lvalue);
 647         assert(rvalue);
 648         assert(data);
 649
 650         k = parse_boolean(rvalue);
 651         if (k < 0) {
 652                 log_syntax(unit, LOG_ERR, filename, line, k,
 653                            "Failed to parse boolean value%s: %s",
 654                            fatal ? "" : ", ignoring", rvalue);
 655                 return fatal ? -ENOEXEC : 0;
 656         }
 657
 658         *b = !!k;
 659         return 0;
 660 }
 661
 662 #if 0 /// UNNEEDED by elogind
 663 int config_parse_tristate(
 664                 const char* unit,
 665                 const char *filename,
 666                 unsigned line,
 667                 const char *section,
 668                 unsigned section_line,
 669                 const char *lvalue,
 670                 int ltype,
 671                 const char *rvalue,
 672                 void *data,
 673                 void *userdata) {
 674
 675         int k, *t = data;
 676
 677         assert(filename);
 678         assert(lvalue);
 679         assert(rvalue);
 680         assert(data);
 681
 682         /* A tristate is pretty much a boolean, except that it can
 683          * also take the special value -1, indicating "uninitialized",
 684          * much like NULL is for a pointer type. */
 685
 686         k = parse_boolean(rvalue);
 687         if (k < 0) {
 688                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 689                 return 0;
 690         }
 691
 692         *t = !!k;
 693         return 0;
 694 }
 695 #endif // 0
 696
 697 int config_parse_string(
 698                 const char *unit,
 699                 const char *filename,
 700                 unsigned line,
 701                 const char *section,
 702                 unsigned section_line,
 703                 const char *lvalue,
 704                 int ltype,
 705                 const char *rvalue,
 706                 void *data,
 707                 void *userdata) {
 708
 709         char **s = data;
 710
 711         assert(filename);
 712         assert(lvalue);
 713         assert(rvalue);
 714         assert(data);
 715
 716         if (free_and_strdup(s, empty_to_null(rvalue)) < 0)
 717                 return log_oom();
 718
 719         return 0;
 720 }
 721
 722 int config_parse_path(
 723                 const char *unit,
 724                 const char *filename,
 725                 unsigned line,
 726                 const char *section,
 727                 unsigned section_line,
 728                 const char *lvalue,
 729                 int ltype,
 730                 const char *rvalue,
 731                 void *data,
 732                 void *userdata) {
 733
 734         _cleanup_free_ char *n = NULL;
 735         bool fatal = ltype;
 736         char **s = data;
 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                 r = strv_consume(sv, word);
 802                 if (r < 0)
 803                         return log_oom();
 804         }
 805
 806         return 0;
 807 }
 808
 809 int config_parse_warn_compat(
 810                 const char *unit,
 811                 const char *filename,
 812                 unsigned line,
 813                 const char *section,
 814                 unsigned section_line,
 815                 const char *lvalue,
 816                 int ltype,
 817                 const char *rvalue,
 818                 void *data,
 819                 void *userdata) {
 820
 821         Disabled reason = ltype;
 822
 823         switch(reason) {
 824
 825         case DISABLED_CONFIGURATION:
 826                 log_syntax(unit, LOG_DEBUG, filename, line, 0,
 827                            "Support for option %s= has been disabled at compile time and it is ignored", lvalue);
 828                 break;
 829
 830         case DISABLED_LEGACY:
 831                 log_syntax(unit, LOG_INFO, filename, line, 0,
 832                            "Support for option %s= has been removed and it is ignored", lvalue);
 833                 break;
 834
 835         case DISABLED_EXPERIMENTAL:
 836                 log_syntax(unit, LOG_INFO, filename, line, 0,
 837                            "Support for option %s= has not yet been enabled and it is ignored", lvalue);
 838                 break;
 839         }
 840
 841         return 0;
 842 }
 843
 844 #if 0 /// UNNEEDED by elogind
 845 int config_parse_log_facility(
 846                 const char *unit,
 847                 const char *filename,
 848                 unsigned line,
 849                 const char *section,
 850                 unsigned section_line,
 851                 const char *lvalue,
 852                 int ltype,
 853                 const char *rvalue,
 854                 void *data,
 855                 void *userdata) {
 856
 857         int *o = data, x;
 858
 859         assert(filename);
 860         assert(lvalue);
 861         assert(rvalue);
 862         assert(data);
 863
 864         x = log_facility_unshifted_from_string(rvalue);
 865         if (x < 0) {
 866                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 867                 return 0;
 868         }
 869
 870         *o = (x << 3) | LOG_PRI(*o);
 871
 872         return 0;
 873 }
 874 #endif // 0
 875
 876 int config_parse_log_level(
 877                 const char *unit,
 878                 const char *filename,
 879                 unsigned line,
 880                 const char *section,
 881                 unsigned section_line,
 882                 const char *lvalue,
 883                 int ltype,
 884                 const char *rvalue,
 885                 void *data,
 886                 void *userdata) {
 887
 888         int *o = data, x;
 889
 890         assert(filename);
 891         assert(lvalue);
 892         assert(rvalue);
 893         assert(data);
 894
 895         x = log_level_from_string(rvalue);
 896         if (x < 0) {
 897                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 898                 return 0;
 899         }
 900
 901         if (*o < 0) /* if it wasn't initialized so far, assume zero facility */
 902                 *o = x;
 903         else
 904                 *o = (*o & LOG_FACMASK) | x;
 905
 906         return 0;
 907 }
 908
 909 int config_parse_signal(
 910                 const char *unit,
 911                 const char *filename,
 912                 unsigned line,
 913                 const char *section,
 914                 unsigned section_line,
 915                 const char *lvalue,
 916                 int ltype,
 917                 const char *rvalue,
 918                 void *data,
 919                 void *userdata) {
 920
 921         int *sig = data, r;
 922
 923         assert(filename);
 924         assert(lvalue);
 925         assert(rvalue);
 926         assert(sig);
 927
 928         r = signal_from_string(rvalue);
 929         if (r <= 0) {
 930                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 931                 return 0;
 932         }
 933
 934         *sig = r;
 935         return 0;
 936 }
 937
 938 #if 0 /// UNNEEDED by elogind
 939 int config_parse_personality(
 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         unsigned long *personality = data, p;
 952
 953         assert(filename);
 954         assert(lvalue);
 955         assert(rvalue);
 956         assert(personality);
 957
 958         if (isempty(rvalue))
 959                 p = PERSONALITY_INVALID;
 960         else {
 961                 p = personality_from_string(rvalue);
 962                 if (p == PERSONALITY_INVALID) {
 963                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
 964                         return 0;
 965                 }
 966         }
 967
 968         *personality = p;
 969         return 0;
 970 }
 971
 972 int config_parse_ifname(
 973                 const char *unit,
 974                 const char *filename,
 975                 unsigned line,
 976                 const char *section,
 977                 unsigned section_line,
 978                 const char *lvalue,
 979                 int ltype,
 980                 const char *rvalue,
 981                 void *data,
 982                 void *userdata) {
 983
 984         char **s = data;
 985         int r;
 986
 987         assert(filename);
 988         assert(lvalue);
 989         assert(rvalue);
 990         assert(data);
 991
 992         if (isempty(rvalue)) {
 993                 *s = mfree(*s);
 994                 return 0;
 995         }
 996
 997         if (!ifname_valid(rvalue)) {
 998                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
 999                 return 0;
1000         }
1001
1002         r = free_and_strdup(s, rvalue);
1003         if (r < 0)
1004                 return log_oom();
1005
1006         return 0;
1007 }
1008
1009 int config_parse_ip_port(
1010                 const char *unit,
1011                 const char *filename,
1012                 unsigned line,
1013                 const char *section,
1014                 unsigned section_line,
1015                 const char *lvalue,
1016                 int ltype,
1017                 const char *rvalue,
1018                 void *data,
1019                 void *userdata) {
1020
1021         uint16_t *s = data;
1022         uint16_t port;
1023         int r;
1024
1025         assert(filename);
1026         assert(lvalue);
1027         assert(rvalue);
1028         assert(data);
1029
1030         if (isempty(rvalue)) {
1031                 *s = 0;
1032                 return 0;
1033         }
1034
1035         r = parse_ip_port(rvalue, &port);
1036         if (r < 0) {
1037                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse port '%s'.", rvalue);
1038                 return 0;
1039         }
1040
1041         *s = port;
1042
1043         return 0;
1044 }
1045
1046 int config_parse_join_controllers(
1047                 const char *unit,
1048                 const char *filename,
1049                 unsigned line,
1050                 const char *section,
1051                 unsigned section_line,
1052                 const char *lvalue,
1053                 int ltype,
1054                 const char *rvalue,
1055                 void *data,
1056                 void *userdata) {
1057
1058         char ****ret = data;
1059         const char *whole_rvalue = rvalue;
1060         unsigned n = 0;
1061         _cleanup_(strv_free_freep) char ***controllers = NULL;
1062
1063         assert(filename);
1064         assert(lvalue);
1065         assert(rvalue);
1066         assert(ret);
1067
1068         for (;;) {
1069                 _cleanup_free_ char *word = NULL;
1070                 char **l;
1071                 int r;
1072
1073                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1074                 if (r < 0) {
1075                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1076                         return r;
1077                 }
1078                 if (r == 0)
1079                         break;
1080
1081                 l = strv_split(word, ",");
1082                 if (!l)
1083                         return log_oom();
1084                 strv_uniq(l);
1085
1086                 if (strv_length(l) <= 1) {
1087                         strv_free(l);
1088                         continue;
1089                 }
1090
1091                 if (!controllers) {
1092                         controllers = new(char**, 2);
1093                         if (!controllers) {
1094                                 strv_free(l);
1095                                 return log_oom();
1096                         }
1097
1098                         controllers[0] = l;
1099                         controllers[1] = NULL;
1100
1101                         n = 1;
1102                 } else {
1103                         char ***a;
1104                         char ***t;
1105
1106                         t = new0(char**, n+2);
1107                         if (!t) {
1108                                 strv_free(l);
1109                                 return log_oom();
1110                         }
1111
1112                         n = 0;
1113
1114                         for (a = controllers; *a; a++)
1115                                 if (strv_overlap(*a, l)) {
1116                                         if (strv_extend_strv(&l, *a, false) < 0) {
1117                                                 strv_free(l);
1118                                                 strv_free_free(t);
1119                                                 return log_oom();
1120                                         }
1121
1122                                 } else {
1123                                         char **c;
1124
1125                                         c = strv_copy(*a);
1126                                         if (!c) {
1127                                                 strv_free(l);
1128                                                 strv_free_free(t);
1129                                                 return log_oom();
1130                                         }
1131
1132                                         t[n++] = c;
1133                                 }
1134
1135                         t[n++] = strv_uniq(l);
1136
1137                         strv_free_free(controllers);
1138                         controllers = t;
1139                 }
1140         }
1141         if (!isempty(rvalue))
1142                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1143
1144         /* As a special case, return a single empty strv, to override the default */
1145         if (!controllers) {
1146                 controllers = new(char**, 2);
1147                 if (!controllers)
1148                         return log_oom();
1149                 controllers[0] = strv_new(NULL, NULL);
1150                 if (!controllers[0])
1151                         return log_oom();
1152                 controllers[1] = NULL;
1153         }
1154
1155         strv_free_free(*ret);
1156         *ret = TAKE_PTR(controllers);
1157
1158         return 0;
1159 }
1160 #endif // 0
1161
1162 int config_parse_mtu(
1163                 const char *unit,
1164                 const char *filename,
1165                 unsigned line,
1166                 const char *section,
1167                 unsigned section_line,
1168                 const char *lvalue,
1169                 int ltype,
1170                 const char *rvalue,
1171                 void *data,
1172                 void *userdata) {
1173
1174         uint32_t *mtu = data;
1175         int r;
1176
1177         assert(rvalue);
1178         assert(mtu);
1179
1180         r = parse_mtu(ltype, rvalue, mtu);
1181         if (r == -ERANGE) {
1182                 log_syntax(unit, LOG_ERR, filename, line, r,
1183                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1184                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1185                            rvalue);
1186                 return 0;
1187         }
1188         if (r < 0) {
1189                 log_syntax(unit, LOG_ERR, filename, line, r,
1190                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1191                 return 0;
1192         }
1193
1194         return 0;
1195 }
1196
1197 int config_parse_rlimit(
1198                 const char *unit,
1199                 const char *filename,
1200                 unsigned line,
1201                 const char *section,
1202                 unsigned section_line,
1203                 const char *lvalue,
1204                 int ltype,
1205                 const char *rvalue,
1206                 void *data,
1207                 void *userdata) {
1208
1209         struct rlimit **rl = data, d = {};
1210         int r;
1211
1212         assert(rvalue);
1213         assert(rl);
1214
1215         r = rlimit_parse(ltype, rvalue, &d);
1216         if (r == -EILSEQ) {
1217                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1218                 return 0;
1219         }
1220         if (r < 0) {
1221                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1222                 return 0;
1223         }
1224
1225         if (rl[ltype])
1226                 *rl[ltype] = d;
1227         else {
1228                 rl[ltype] = newdup(struct rlimit, &d, 1);
1229                 if (!rl[ltype])
1230                         return log_oom();
1231         }
1232
1233         return 0;
1234 }
1235
1236 int config_parse_permille(const char* unit,
1237                           const char *filename,
1238                           unsigned line,
1239                           const char *section,
1240                           unsigned section_line,
1241                           const char *lvalue,
1242                           int ltype,
1243                           const char *rvalue,
1244                           void *data,
1245                           void *userdata) {
1246
1247         unsigned *permille = data;
1248         int r;
1249
1250         assert(filename);
1251         assert(lvalue);
1252         assert(rvalue);
1253         assert(permille);
1254
1255         r = parse_permille(rvalue);
1256         if (r < 0) {
1257                 log_syntax(unit, LOG_ERR, filename, line, r,
1258                            "Failed to parse permille value, ignoring: %s", rvalue);
1259                 return 0;
1260         }
1261
1262         *permille = (unsigned) r;
1263
1264         return 0;
1265 }