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