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 == ENOENT ? LOG_DEBUG : LOG_ERR,
 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         char **s = data, *n;
 710         bool fatal = ltype;
 711         int r;
 712
 713         assert(filename);
 714         assert(lvalue);
 715         assert(rvalue);
 716         assert(data);
 717
 718         if (isempty(rvalue)) {
 719                 n = NULL;
 720                 goto finalize;
 721         }
 722
 723         n = strdup(rvalue);
 724         if (!n)
 725                 return log_oom();
 726
 727         r = path_simplify_and_warn(n, PATH_CHECK_ABSOLUTE | (fatal ? PATH_CHECK_FATAL : 0), unit, filename, line, lvalue);
 728         if (r < 0)
 729                 return fatal ? -ENOEXEC : 0;
 730
 731 finalize:
 732         free_and_replace(*s, n);
 733
 734         return 0;
 735 }
 736
 737 int config_parse_strv(
 738                 const char *unit,
 739                 const char *filename,
 740                 unsigned line,
 741                 const char *section,
 742                 unsigned section_line,
 743                 const char *lvalue,
 744                 int ltype,
 745                 const char *rvalue,
 746                 void *data,
 747                 void *userdata) {
 748
 749         char ***sv = data;
 750         int r;
 751
 752         assert(filename);
 753         assert(lvalue);
 754         assert(rvalue);
 755         assert(data);
 756
 757         if (isempty(rvalue)) {
 758                 *sv = strv_free(*sv);
 759                 return 0;
 760         }
 761
 762         for (;;) {
 763                 char *word = NULL;
 764
 765                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES|EXTRACT_RETAIN_ESCAPE);
 766                 if (r == 0)
 767                         break;
 768                 if (r == -ENOMEM)
 769                         return log_oom();
 770                 if (r < 0) {
 771                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
 772                         break;
 773                 }
 774
 775                 r = strv_consume(sv, word);
 776                 if (r < 0)
 777                         return log_oom();
 778         }
 779
 780         return 0;
 781 }
 782
 783 int config_parse_warn_compat(
 784                 const char *unit,
 785                 const char *filename,
 786                 unsigned line,
 787                 const char *section,
 788                 unsigned section_line,
 789                 const char *lvalue,
 790                 int ltype,
 791                 const char *rvalue,
 792                 void *data,
 793                 void *userdata) {
 794
 795         Disabled reason = ltype;
 796
 797         switch(reason) {
 798
 799         case DISABLED_CONFIGURATION:
 800                 log_syntax(unit, LOG_DEBUG, filename, line, 0,
 801                            "Support for option %s= has been disabled at compile time and it is ignored", lvalue);
 802                 break;
 803
 804         case DISABLED_LEGACY:
 805                 log_syntax(unit, LOG_INFO, filename, line, 0,
 806                            "Support for option %s= has been removed and it is ignored", lvalue);
 807                 break;
 808
 809         case DISABLED_EXPERIMENTAL:
 810                 log_syntax(unit, LOG_INFO, filename, line, 0,
 811                            "Support for option %s= has not yet been enabled and it is ignored", lvalue);
 812                 break;
 813         }
 814
 815         return 0;
 816 }
 817
 818 int config_parse_log_facility(
 819                 const char *unit,
 820                 const char *filename,
 821                 unsigned line,
 822                 const char *section,
 823                 unsigned section_line,
 824                 const char *lvalue,
 825                 int ltype,
 826                 const char *rvalue,
 827                 void *data,
 828                 void *userdata) {
 829
 830         int *o = data, x;
 831
 832         assert(filename);
 833         assert(lvalue);
 834         assert(rvalue);
 835         assert(data);
 836
 837         x = log_facility_unshifted_from_string(rvalue);
 838         if (x < 0) {
 839                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 840                 return 0;
 841         }
 842
 843         *o = (x << 3) | LOG_PRI(*o);
 844
 845         return 0;
 846 }
 847
 848 int config_parse_log_level(
 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_level_from_string(rvalue);
 868         if (x < 0) {
 869                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 870                 return 0;
 871         }
 872
 873         if (*o < 0) /* if it wasn't initialized so far, assume zero facility */
 874                 *o = x;
 875         else
 876                 *o = (*o & LOG_FACMASK) | x;
 877
 878         return 0;
 879 }
 880
 881 int config_parse_signal(
 882                 const char *unit,
 883                 const char *filename,
 884                 unsigned line,
 885                 const char *section,
 886                 unsigned section_line,
 887                 const char *lvalue,
 888                 int ltype,
 889                 const char *rvalue,
 890                 void *data,
 891                 void *userdata) {
 892
 893         int *sig = data, r;
 894
 895         assert(filename);
 896         assert(lvalue);
 897         assert(rvalue);
 898         assert(sig);
 899
 900         r = signal_from_string(rvalue);
 901         if (r <= 0) {
 902                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 903                 return 0;
 904         }
 905
 906         *sig = r;
 907         return 0;
 908 }
 909
 910 int config_parse_personality(
 911                 const char *unit,
 912                 const char *filename,
 913                 unsigned line,
 914                 const char *section,
 915                 unsigned section_line,
 916                 const char *lvalue,
 917                 int ltype,
 918                 const char *rvalue,
 919                 void *data,
 920                 void *userdata) {
 921
 922         unsigned long *personality = data, p;
 923
 924         assert(filename);
 925         assert(lvalue);
 926         assert(rvalue);
 927         assert(personality);
 928
 929         if (isempty(rvalue))
 930                 p = PERSONALITY_INVALID;
 931         else {
 932                 p = personality_from_string(rvalue);
 933                 if (p == PERSONALITY_INVALID) {
 934                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
 935                         return 0;
 936                 }
 937         }
 938
 939         *personality = p;
 940         return 0;
 941 }
 942
 943 int config_parse_ifname(
 944                 const char *unit,
 945                 const char *filename,
 946                 unsigned line,
 947                 const char *section,
 948                 unsigned section_line,
 949                 const char *lvalue,
 950                 int ltype,
 951                 const char *rvalue,
 952                 void *data,
 953                 void *userdata) {
 954
 955         char **s = data;
 956         int r;
 957
 958         assert(filename);
 959         assert(lvalue);
 960         assert(rvalue);
 961         assert(data);
 962
 963         if (isempty(rvalue)) {
 964                 *s = mfree(*s);
 965                 return 0;
 966         }
 967
 968         if (!ifname_valid(rvalue)) {
 969                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
 970                 return 0;
 971         }
 972
 973         r = free_and_strdup(s, rvalue);
 974         if (r < 0)
 975                 return log_oom();
 976
 977         return 0;
 978 }
 979
 980 int config_parse_ip_port(
 981                 const char *unit,
 982                 const char *filename,
 983                 unsigned line,
 984                 const char *section,
 985                 unsigned section_line,
 986                 const char *lvalue,
 987                 int ltype,
 988                 const char *rvalue,
 989                 void *data,
 990                 void *userdata) {
 991
 992         uint16_t *s = data;
 993         uint16_t port;
 994         int r;
 995
 996         assert(filename);
 997         assert(lvalue);
 998         assert(rvalue);
 999         assert(data);
1000
1001         if (isempty(rvalue)) {
1002                 *s = 0;
1003                 return 0;
1004         }
1005
1006         r = parse_ip_port(rvalue, &port);
1007         if (r < 0) {
1008                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse port '%s'.", rvalue);
1009                 return 0;
1010         }
1011
1012         *s = port;
1013
1014         return 0;
1015 }
1016
1017 int config_parse_join_controllers(
1018                 const char *unit,
1019                 const char *filename,
1020                 unsigned line,
1021                 const char *section,
1022                 unsigned section_line,
1023                 const char *lvalue,
1024                 int ltype,
1025                 const char *rvalue,
1026                 void *data,
1027                 void *userdata) {
1028
1029         char ****ret = data;
1030         const char *whole_rvalue = rvalue;
1031         unsigned n = 0;
1032         _cleanup_(strv_free_freep) char ***controllers = NULL;
1033
1034         assert(filename);
1035         assert(lvalue);
1036         assert(rvalue);
1037         assert(ret);
1038
1039         for (;;) {
1040                 _cleanup_free_ char *word = NULL;
1041                 char **l;
1042                 int r;
1043
1044                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1045                 if (r < 0) {
1046                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1047                         return r;
1048                 }
1049                 if (r == 0)
1050                         break;
1051
1052                 l = strv_split(word, ",");
1053                 if (!l)
1054                         return log_oom();
1055                 strv_uniq(l);
1056
1057                 if (strv_length(l) <= 1) {
1058                         strv_free(l);
1059                         continue;
1060                 }
1061
1062                 if (!controllers) {
1063                         controllers = new(char**, 2);
1064                         if (!controllers) {
1065                                 strv_free(l);
1066                                 return log_oom();
1067                         }
1068
1069                         controllers[0] = l;
1070                         controllers[1] = NULL;
1071
1072                         n = 1;
1073                 } else {
1074                         char ***a;
1075                         char ***t;
1076
1077                         t = new0(char**, n+2);
1078                         if (!t) {
1079                                 strv_free(l);
1080                                 return log_oom();
1081                         }
1082
1083                         n = 0;
1084
1085                         for (a = controllers; *a; a++)
1086                                 if (strv_overlap(*a, l)) {
1087                                         if (strv_extend_strv(&l, *a, false) < 0) {
1088                                                 strv_free(l);
1089                                                 strv_free_free(t);
1090                                                 return log_oom();
1091                                         }
1092
1093                                 } else {
1094                                         char **c;
1095
1096                                         c = strv_copy(*a);
1097                                         if (!c) {
1098                                                 strv_free(l);
1099                                                 strv_free_free(t);
1100                                                 return log_oom();
1101                                         }
1102
1103                                         t[n++] = c;
1104                                 }
1105
1106                         t[n++] = strv_uniq(l);
1107
1108                         strv_free_free(controllers);
1109                         controllers = t;
1110                 }
1111         }
1112         if (!isempty(rvalue))
1113                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1114
1115         /* As a special case, return a single empty strv, to override the default */
1116         if (!controllers) {
1117                 controllers = new(char**, 2);
1118                 if (!controllers)
1119                         return log_oom();
1120                 controllers[0] = strv_new(NULL, NULL);
1121                 if (!controllers[0])
1122                         return log_oom();
1123                 controllers[1] = NULL;
1124         }
1125
1126         strv_free_free(*ret);
1127         *ret = TAKE_PTR(controllers);
1128
1129         return 0;
1130 }
1131
1132 int config_parse_mtu(
1133                 const char *unit,
1134                 const char *filename,
1135                 unsigned line,
1136                 const char *section,
1137                 unsigned section_line,
1138                 const char *lvalue,
1139                 int ltype,
1140                 const char *rvalue,
1141                 void *data,
1142                 void *userdata) {
1143
1144         uint32_t *mtu = data;
1145         int r;
1146
1147         assert(rvalue);
1148         assert(mtu);
1149
1150         r = parse_mtu(ltype, rvalue, mtu);
1151         if (r == -ERANGE) {
1152                 log_syntax(unit, LOG_ERR, filename, line, r,
1153                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1154                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1155                            rvalue);
1156                 return 0;
1157         }
1158         if (r < 0) {
1159                 log_syntax(unit, LOG_ERR, filename, line, r,
1160                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1161                 return 0;
1162         }
1163
1164         return 0;
1165 }
1166
1167 int config_parse_rlimit(
1168                 const char *unit,
1169                 const char *filename,
1170                 unsigned line,
1171                 const char *section,
1172                 unsigned section_line,
1173                 const char *lvalue,
1174                 int ltype,
1175                 const char *rvalue,
1176                 void *data,
1177                 void *userdata) {
1178
1179         struct rlimit **rl = data, d = {};
1180         int r;
1181
1182         assert(rvalue);
1183         assert(rl);
1184
1185         r = rlimit_parse(ltype, rvalue, &d);
1186         if (r == -EILSEQ) {
1187                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1188                 return 0;
1189         }
1190         if (r < 0) {
1191                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1192                 return 0;
1193         }
1194
1195         if (rl[ltype])
1196                 *rl[ltype] = d;
1197         else {
1198                 rl[ltype] = newdup(struct rlimit, &d, 1);
1199                 if (!rl[ltype])
1200                         return log_oom();
1201         }
1202
1203         return 0;
1204 }