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