src/shared/conf-parser.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <limits.h>
  10 #include <stdint.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <sys/types.h>
  15
  16 #include "alloc-util.h"
  17 #include "conf-files.h"
  18 #include "conf-parser.h"
  19 #include "def.h"
  20 #include "extract-word.h"
  21 #include "fd-util.h"
  22 #include "fileio.h"
  23 #include "fs-util.h"
  24 #include "log.h"
  25 #include "macro.h"
  26 #include "parse-util.h"
  27 #include "path-util.h"
  28 #include "process-util.h"
  29 #include "signal-util.h"
  30 #include "socket-util.h"
  31 #include "string-util.h"
  32 #include "strv.h"
  33 #include "syslog-util.h"
  34 #include "time-util.h"
  35 #include "utf8.h"
  36
  37 /// Additional includes needed by elogind
  38 #include "def.h"
  39 #include "fileio.h"
  40 //#include "rlimit-util.h"
  41
  42 int config_item_table_lookup(
  43                 const void *table,
  44                 const char *section,
  45                 const char *lvalue,
  46                 ConfigParserCallback *func,
  47                 int *ltype,
  48                 void **data,
  49                 void *userdata) {
  50
  51         const ConfigTableItem *t;
  52
  53         assert(table);
  54         assert(lvalue);
  55         assert(func);
  56         assert(ltype);
  57         assert(data);
  58
  59         for (t = table; t->lvalue; t++) {
  60
  61                 if (!streq(lvalue, t->lvalue))
  62                         continue;
  63
  64                 if (!streq_ptr(section, t->section))
  65                         continue;
  66
  67                 *func = t->parse;
  68                 *ltype = t->ltype;
  69                 *data = t->data;
  70                 return 1;
  71         }
  72
  73         return 0;
  74 }
  75
  76 int config_item_perf_lookup(
  77                 const void *table,
  78                 const char *section,
  79                 const char *lvalue,
  80                 ConfigParserCallback *func,
  81                 int *ltype,
  82                 void **data,
  83                 void *userdata) {
  84
  85         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  86         const ConfigPerfItem *p;
  87
  88         assert(table);
  89         assert(lvalue);
  90         assert(func);
  91         assert(ltype);
  92         assert(data);
  93
  94         if (!section)
  95                 p = lookup(lvalue, strlen(lvalue));
  96         else {
  97                 char *key;
  98
  99                 key = strjoin(section, ".", lvalue);
 100                 if (!key)
 101                         return -ENOMEM;
 102
 103                 p = lookup(key, strlen(key));
 104                 free(key);
 105         }
 106
 107         if (!p)
 108                 return 0;
 109
 110         *func = p->parse;
 111         *ltype = p->ltype;
 112         *data = (uint8_t*) userdata + p->offset;
 113         return 1;
 114 }
 115
 116 /* Run the user supplied parser for an assignment */
 117 static int next_assignment(
 118                 const char *unit,
 119                 const char *filename,
 120                 unsigned line,
 121                 ConfigItemLookup lookup,
 122                 const void *table,
 123                 const char *section,
 124                 unsigned section_line,
 125                 const char *lvalue,
 126                 const char *rvalue,
 127                 ConfigParseFlags flags,
 128                 void *userdata) {
 129
 130         ConfigParserCallback func = NULL;
 131         int ltype = 0;
 132         void *data = NULL;
 133         int r;
 134
 135         assert(filename);
 136         assert(line > 0);
 137         assert(lookup);
 138         assert(lvalue);
 139         assert(rvalue);
 140
 141         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 142         if (r < 0)
 143                 return r;
 144
 145         if (r > 0) {
 146                 if (func)
 147                         return func(unit, filename, line, section, section_line,
 148                                     lvalue, ltype, rvalue, data, userdata);
 149
 150                 return 0;
 151         }
 152
 153         /* Warn about unknown non-extension fields. */
 154         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(lvalue, "X-"))
 155                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 156
 157         return 0;
 158 }
 159
 160 /* Parse a single logical line */
 161 static int parse_line(
 162                 const char* unit,
 163                 const char *filename,
 164                 unsigned line,
 165                 const char *sections,
 166                 ConfigItemLookup lookup,
 167                 const void *table,
 168                 ConfigParseFlags flags,
 169                 char **section,
 170                 unsigned *section_line,
 171                 bool *section_ignored,
 172                 char *l,
 173                 void *userdata) {
 174
 175         char *e, *include;
 176
 177         assert(filename);
 178         assert(line > 0);
 179         assert(lookup);
 180         assert(l);
 181
 182         l = strstrip(l);
 183         if (!*l)
 184                 return 0;
 185
 186         if (strchr(COMMENTS "\n", *l))
 187                 return 0;
 188
 189         include = first_word(l, ".include");
 190         if (include) {
 191                 _cleanup_free_ char *fn = NULL;
 192
 193                 /* .includes are a bad idea, we only support them here
 194                  * for historical reasons. They create cyclic include
 195                  * problems and make it difficult to detect
 196                  * configuration file changes with an easy
 197                  * stat(). Better approaches, such as .d/ drop-in
 198                  * snippets exist.
 199                  *
 200                  * Support for them should be eventually removed. */
 201
 202                 if (!(flags & CONFIG_PARSE_ALLOW_INCLUDE)) {
 203                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 204                         return 0;
 205                 }
 206
 207                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 208                            ".include directives are deprecated, and support for them will be removed in a future version of elogind. "
 209                            "Please use drop-in files instead.");
 210
 211                 fn = file_in_same_dir(filename, strstrip(include));
 212                 if (!fn)
 213                         return -ENOMEM;
 214
 215                 return config_parse(unit, fn, NULL, sections, lookup, table, flags, userdata);
 216         }
 217
 218         if (*l == '[') {
 219                 size_t k;
 220                 char *n;
 221
 222                 k = strlen(l);
 223                 assert(k > 0);
 224
 225                 if (l[k-1] != ']') {
 226                         log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid section header '%s'", l);
 227                         return -EBADMSG;
 228                 }
 229
 230                 n = strndup(l+1, k-2);
 231                 if (!n)
 232                         return -ENOMEM;
 233
 234                 if (sections && !nulstr_contains(sections, n)) {
 235
 236                         if (!(flags & CONFIG_PARSE_RELAXED) && !startswith(n, "X-"))
 237                                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown section '%s'. Ignoring.", n);
 238
 239                         free(n);
 240                         *section = mfree(*section);
 241                         *section_line = 0;
 242                         *section_ignored = true;
 243                 } else {
 244                         free(*section);
 245                         *section = n;
 246                         *section_line = line;
 247                         *section_ignored = false;
 248                 }
 249
 250                 return 0;
 251         }
 252
 253         if (sections && !*section) {
 254
 255                 if (!(flags & CONFIG_PARSE_RELAXED) && !*section_ignored)
 256                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 257
 258                 return 0;
 259         }
 260
 261         e = strchr(l, '=');
 262         if (!e) {
 263                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 264                 return -EINVAL;
 265         }
 266
 267         *e = 0;
 268         e++;
 269
 270         return next_assignment(unit,
 271                                filename,
 272                                line,
 273                                lookup,
 274                                table,
 275                                *section,
 276                                *section_line,
 277                                strstrip(l),
 278                                strstrip(e),
 279                                flags,
 280                                userdata);
 281 }
 282
 283 /* Go through the file and parse each line */
 284 int config_parse(const char *unit,
 285                  const char *filename,
 286                  FILE *f,
 287                  const char *sections,
 288                  ConfigItemLookup lookup,
 289                  const void *table,
 290                  ConfigParseFlags flags,
 291                  void *userdata) {
 292
 293         _cleanup_free_ char *section = NULL, *continuation = NULL;
 294         _cleanup_fclose_ FILE *ours = NULL;
 295         unsigned line = 0, section_line = 0;
 296         bool section_ignored = false;
 297         int r;
 298
 299         assert(filename);
 300         assert(lookup);
 301
 302         if (!f) {
 303                 f = ours = fopen(filename, "re");
 304                 if (!f) {
 305                         /* Only log on request, except for ENOENT,
 306                          * since we return 0 to the caller. */
 307                         if ((flags & CONFIG_PARSE_WARN) || errno == ENOENT)
 308                                 log_full(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
 309                                          "Failed to open configuration file '%s': %m", filename);
 310                         return errno == ENOENT ? 0 : -errno;
 311                 }
 312         }
 313
 314         fd_warn_permissions(filename, fileno(f));
 315
 316         for (;;) {
 317                 _cleanup_free_ char *buf = NULL;
 318                 bool escaped = false;
 319                 char *l, *p, *e;
 320
 321                 r = read_line(f, LONG_LINE_MAX, &buf);
 322                 if (r == 0)
 323                         break;
 324                 if (r == -ENOBUFS) {
 325                         if (flags & CONFIG_PARSE_WARN)
 326                                 log_error_errno(r, "%s:%u: Line too long", filename, line);
 327
 328                         return r;
 329                 }
 330                 if (r < 0) {
 331                         if (CONFIG_PARSE_WARN)
 332                                 log_error_errno(r, "%s:%u: Error while reading configuration file: %m", filename, line);
 333
 334                         return r;
 335                 }
 336
 337                 l = buf;
 338                 if (!(flags & CONFIG_PARSE_REFUSE_BOM)) {
 339                         char *q;
 340
 341                         q = startswith(buf, UTF8_BYTE_ORDER_MARK);
 342                         if (q) {
 343                                 l = q;
 344                                 flags |= CONFIG_PARSE_REFUSE_BOM;
 345                         }
 346                 }
 347
 348                 if (continuation) {
 349                         if (strlen(continuation) + strlen(l) > LONG_LINE_MAX) {
 350                                 if (flags & CONFIG_PARSE_WARN)
 351                                         log_error("%s:%u: Continuation line too long", filename, line);
 352                                 return -ENOBUFS;
 353                         }
 354
 355                         if (!strextend(&continuation, l, NULL)) {
 356                                 if (flags & CONFIG_PARSE_WARN)
 357                                         log_oom();
 358                                 return -ENOMEM;
 359                         }
 360
 361                         p = continuation;
 362                 } else
 363                         p = l;
 364
 365                 for (e = p; *e; e++) {
 366                         if (escaped)
 367                                 escaped = false;
 368                         else if (*e == '\\')
 369                                 escaped = true;
 370                 }
 371
 372                 if (escaped) {
 373                         *(e-1) = ' ';
 374
 375                         if (!continuation) {
 376                                 continuation = strdup(l);
 377                                 if (!continuation) {
 378                                         if (flags & CONFIG_PARSE_WARN)
 379                                                 log_oom();
 380                                         return -ENOMEM;
 381                                 }
 382                         }
 383
 384                         continue;
 385                 }
 386
 387                 r = parse_line(unit,
 388                                filename,
 389                                ++line,
 390                                sections,
 391                                lookup,
 392                                table,
 393                                flags,
 394                                &section,
 395                                &section_line,
 396                                &section_ignored,
 397                                p,
 398                                userdata);
 399                 if (r < 0) {
 400                         if (flags & CONFIG_PARSE_WARN)
 401                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 402                         return r;
 403
 404                 }
 405
 406                 continuation = mfree(continuation);
 407         }
 408
 409         if (continuation) {
 410                 r = parse_line(unit,
 411                                filename,
 412                                ++line,
 413                                sections,
 414                                lookup,
 415                                table,
 416                                flags,
 417                                &section,
 418                                &section_line,
 419                                &section_ignored,
 420                                continuation,
 421                                userdata);
 422                 if (r < 0) {
 423                         if (flags & CONFIG_PARSE_WARN)
 424                                 log_warning_errno(r, "%s:%u: Failed to parse file: %m", filename, line);
 425                         return r;
 426
 427                 }
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int config_parse_many_files(
 434                 const char *conf_file,
 435                 char **files,
 436                 const char *sections,
 437                 ConfigItemLookup lookup,
 438                 const void *table,
 439                 ConfigParseFlags flags,
 440                 void *userdata) {
 441
 442         char **fn;
 443         int r;
 444
 445         if (conf_file) {
 446                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, flags, userdata);
 447                 if (r < 0)
 448                         return r;
 449         }
 450
 451         STRV_FOREACH(fn, files) {
 452                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, flags, userdata);
 453                 if (r < 0)
 454                         return r;
 455         }
 456
 457         return 0;
 458 }
 459
 460 /* Parse each config file in the directories specified as nulstr. */
 461 int config_parse_many_nulstr(
 462                 const char *conf_file,
 463                 const char *conf_file_dirs,
 464                 const char *sections,
 465                 ConfigItemLookup lookup,
 466                 const void *table,
 467                 ConfigParseFlags flags,
 468                 void *userdata) {
 469
 470         _cleanup_strv_free_ char **files = NULL;
 471         int r;
 472
 473         r = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 474         if (r < 0)
 475                 return r;
 476
 477         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 478 }
 479
 480 #if 0 /// UNNEEDED by elogind
 481 /* Parse each config file in the directories specified as strv. */
 482 int config_parse_many(
 483                 const char *conf_file,
 484                 const char* const* conf_file_dirs,
 485                 const char *dropin_dirname,
 486                 const char *sections,
 487                 ConfigItemLookup lookup,
 488                 const void *table,
 489                 ConfigParseFlags flags,
 490                 void *userdata) {
 491
 492         _cleanup_strv_free_ char **dropin_dirs = NULL;
 493         _cleanup_strv_free_ char **files = NULL;
 494         const char *suffix;
 495         int r;
 496
 497         suffix = strjoina("/", dropin_dirname);
 498         r = strv_extend_strv_concat(&dropin_dirs, (char**) conf_file_dirs, suffix);
 499         if (r < 0)
 500                 return r;
 501
 502         r = conf_files_list_strv(&files, ".conf", NULL, 0, (const char* const*) dropin_dirs);
 503         if (r < 0)
 504                 return r;
 505
 506         return config_parse_many_files(conf_file, files, sections, lookup, table, flags, userdata);
 507 }
 508 #endif // 0
 509
 510 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 511         int config_parse_##type(                                        \
 512                         const char *unit,                               \
 513                         const char *filename,                           \
 514                         unsigned line,                                  \
 515                         const char *section,                            \
 516                         unsigned section_line,                          \
 517                         const char *lvalue,                             \
 518                         int ltype,                                      \
 519                         const char *rvalue,                             \
 520                         void *data,                                     \
 521                         void *userdata) {                               \
 522                                                                         \
 523                 vartype *i = data;                                      \
 524                 int r;                                                  \
 525                                                                         \
 526                 assert(filename);                                       \
 527                 assert(lvalue);                                         \
 528                 assert(rvalue);                                         \
 529                 assert(data);                                           \
 530                                                                         \
 531                 r = conv_func(rvalue, i);                               \
 532                 if (r < 0)                                              \
 533                         log_syntax(unit, LOG_ERR, filename, line, r,    \
 534                                    "Failed to parse %s value, ignoring: %s", \
 535                                    #type, rvalue);                      \
 536                                                                         \
 537                 return 0;                                               \
 538         }
 539
 540 DEFINE_PARSER(int, int, safe_atoi);
 541 DEFINE_PARSER(long, long, safe_atoli);
 542 #if 0 /// UNNEEDED by elogind
 543 DEFINE_PARSER(uint8, uint8_t, safe_atou8);
 544 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 545 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 546 #endif // 0
 547 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 548 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 549 DEFINE_PARSER(double, double, safe_atod);
 550 #if 0 /// UNNEEDED by elogind
 551 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 552 #endif // 0
 553 DEFINE_PARSER(sec, usec_t, parse_sec);
 554 DEFINE_PARSER(mode, mode_t, parse_mode);
 555
 556 int config_parse_iec_size(const char* unit,
 557                             const char *filename,
 558                             unsigned line,
 559                             const char *section,
 560                             unsigned section_line,
 561                             const char *lvalue,
 562                             int ltype,
 563                             const char *rvalue,
 564                             void *data,
 565                             void *userdata) {
 566
 567         size_t *sz = data;
 568         uint64_t v;
 569         int r;
 570
 571         assert(filename);
 572         assert(lvalue);
 573         assert(rvalue);
 574         assert(data);
 575
 576         r = parse_size(rvalue, 1024, &v);
 577         if (r < 0 || (uint64_t) (size_t) v != v) {
 578                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 579                 return 0;
 580         }
 581
 582         *sz = (size_t) v;
 583         return 0;
 584 }
 585
 586 #if 0 /// UNNEEDED by elogind
 587 int config_parse_si_size(
 588                 const char* unit,
 589                 const char *filename,
 590                 unsigned line,
 591                 const char *section,
 592                 unsigned section_line,
 593                 const char *lvalue,
 594                 int ltype,
 595                 const char *rvalue,
 596                 void *data,
 597                 void *userdata) {
 598
 599         size_t *sz = data;
 600         uint64_t v;
 601         int r;
 602
 603         assert(filename);
 604         assert(lvalue);
 605         assert(rvalue);
 606         assert(data);
 607
 608         r = parse_size(rvalue, 1000, &v);
 609         if (r < 0 || (uint64_t) (size_t) v != v) {
 610                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 611                 return 0;
 612         }
 613
 614         *sz = (size_t) v;
 615         return 0;
 616 }
 617
 618 int config_parse_iec_uint64(
 619                 const char* unit,
 620                 const char *filename,
 621                 unsigned line,
 622                 const char *section,
 623                 unsigned section_line,
 624                 const char *lvalue,
 625                 int ltype,
 626                 const char *rvalue,
 627                 void *data,
 628                 void *userdata) {
 629
 630         uint64_t *bytes = data;
 631         int r;
 632
 633         assert(filename);
 634         assert(lvalue);
 635         assert(rvalue);
 636         assert(data);
 637
 638         r = parse_size(rvalue, 1024, bytes);
 639         if (r < 0)
 640                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 641
 642         return 0;
 643 }
 644 #endif // 0
 645
 646 int config_parse_bool(const char* unit,
 647                       const char *filename,
 648                       unsigned line,
 649                       const char *section,
 650                       unsigned section_line,
 651                       const char *lvalue,
 652                       int ltype,
 653                       const char *rvalue,
 654                       void *data,
 655                       void *userdata) {
 656
 657         int k;
 658         bool *b = data;
 659         bool fatal = ltype;
 660
 661         assert(filename);
 662         assert(lvalue);
 663         assert(rvalue);
 664         assert(data);
 665
 666         k = parse_boolean(rvalue);
 667         if (k < 0) {
 668                 log_syntax(unit, LOG_ERR, filename, line, k,
 669                            "Failed to parse boolean value%s: %s",
 670                            fatal ? "" : ", ignoring", rvalue);
 671                 return fatal ? -ENOEXEC : 0;
 672         }
 673
 674         *b = !!k;
 675         return 0;
 676 }
 677
 678 #if 0 /// UNNEEDED by elogind
 679 int config_parse_tristate(
 680                 const char* unit,
 681                 const char *filename,
 682                 unsigned line,
 683                 const char *section,
 684                 unsigned section_line,
 685                 const char *lvalue,
 686                 int ltype,
 687                 const char *rvalue,
 688                 void *data,
 689                 void *userdata) {
 690
 691         int k, *t = data;
 692
 693         assert(filename);
 694         assert(lvalue);
 695         assert(rvalue);
 696         assert(data);
 697
 698         /* A tristate is pretty much a boolean, except that it can
 699          * also take the special value -1, indicating "uninitialized",
 700          * much like NULL is for a pointer type. */
 701
 702         k = parse_boolean(rvalue);
 703         if (k < 0) {
 704                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 705                 return 0;
 706         }
 707
 708         *t = !!k;
 709         return 0;
 710 }
 711 #endif // 0
 712
 713 int config_parse_string(
 714                 const char *unit,
 715                 const char *filename,
 716                 unsigned line,
 717                 const char *section,
 718                 unsigned section_line,
 719                 const char *lvalue,
 720                 int ltype,
 721                 const char *rvalue,
 722                 void *data,
 723                 void *userdata) {
 724
 725         char **s = data, *n;
 726
 727         assert(filename);
 728         assert(lvalue);
 729         assert(rvalue);
 730         assert(data);
 731
 732         if (!utf8_is_valid(rvalue)) {
 733                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 734                 return 0;
 735         }
 736
 737         if (isempty(rvalue))
 738                 n = NULL;
 739         else {
 740                 n = strdup(rvalue);
 741                 if (!n)
 742                         return log_oom();
 743         }
 744
 745         free(*s);
 746         *s = n;
 747
 748         return 0;
 749 }
 750
 751 int config_parse_path(
 752                 const char *unit,
 753                 const char *filename,
 754                 unsigned line,
 755                 const char *section,
 756                 unsigned section_line,
 757                 const char *lvalue,
 758                 int ltype,
 759                 const char *rvalue,
 760                 void *data,
 761                 void *userdata) {
 762
 763         char **s = data, *n;
 764         bool fatal = ltype;
 765
 766         assert(filename);
 767         assert(lvalue);
 768         assert(rvalue);
 769         assert(data);
 770
 771         if (isempty(rvalue)) {
 772                 n = NULL;
 773                 goto finalize;
 774         }
 775
 776         if (!utf8_is_valid(rvalue)) {
 777                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 778                 return fatal ? -ENOEXEC : 0;
 779         }
 780
 781         if (!path_is_absolute(rvalue)) {
 782                 log_syntax(unit, LOG_ERR, filename, line, 0,
 783                            "Not an absolute path%s: %s",
 784                            fatal ? "" : ", ignoring", rvalue);
 785                 return fatal ? -ENOEXEC : 0;
 786         }
 787
 788         n = strdup(rvalue);
 789         if (!n)
 790                 return log_oom();
 791
 792         path_kill_slashes(n);
 793
 794 finalize:
 795         free(*s);
 796         *s = n;
 797
 798         return 0;
 799 }
 800
 801 int config_parse_strv(
 802                 const char *unit,
 803                 const char *filename,
 804                 unsigned line,
 805                 const char *section,
 806                 unsigned section_line,
 807                 const char *lvalue,
 808                 int ltype,
 809                 const char *rvalue,
 810                 void *data,
 811                 void *userdata) {
 812
 813         char ***sv = data;
 814         int r;
 815
 816         assert(filename);
 817         assert(lvalue);
 818         assert(rvalue);
 819         assert(data);
 820
 821         if (isempty(rvalue)) {
 822                 *sv = strv_free(*sv);
 823                 return 0;
 824         }
 825
 826         for (;;) {
 827                 char *word = NULL;
 828
 829                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES|EXTRACT_RETAIN_ESCAPE);
 830                 if (r == 0)
 831                         break;
 832                 if (r == -ENOMEM)
 833                         return log_oom();
 834                 if (r < 0) {
 835                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
 836                         break;
 837                 }
 838
 839                 if (!utf8_is_valid(word)) {
 840                         log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, word);
 841                         free(word);
 842                         continue;
 843                 }
 844
 845                 r = strv_consume(sv, word);
 846                 if (r < 0)
 847                         return log_oom();
 848         }
 849
 850         return 0;
 851 }
 852
 853 int config_parse_warn_compat(
 854                 const char *unit,
 855                 const char *filename,
 856                 unsigned line,
 857                 const char *section,
 858                 unsigned section_line,
 859                 const char *lvalue,
 860                 int ltype,
 861                 const char *rvalue,
 862                 void *data,
 863                 void *userdata) {
 864         Disabled reason = ltype;
 865
 866         switch(reason) {
 867         case DISABLED_CONFIGURATION:
 868                 log_syntax(unit, LOG_DEBUG, filename, line, 0,
 869                            "Support for option %s= has been disabled at compile time and it is ignored", lvalue);
 870                 break;
 871         case DISABLED_LEGACY:
 872                 log_syntax(unit, LOG_INFO, filename, line, 0,
 873                            "Support for option %s= has been removed and it is ignored", lvalue);
 874                 break;
 875         case DISABLED_EXPERIMENTAL:
 876                 log_syntax(unit, LOG_INFO, filename, line, 0,
 877                            "Support for option %s= has not yet been enabled and it is ignored", lvalue);
 878                 break;
 879         };
 880
 881         return 0;
 882 }
 883
 884 #if 0 /// UNNEEDED by elogind
 885 int config_parse_log_facility(
 886                 const char *unit,
 887                 const char *filename,
 888                 unsigned line,
 889                 const char *section,
 890                 unsigned section_line,
 891                 const char *lvalue,
 892                 int ltype,
 893                 const char *rvalue,
 894                 void *data,
 895                 void *userdata) {
 896
 897         int *o = data, x;
 898
 899         assert(filename);
 900         assert(lvalue);
 901         assert(rvalue);
 902         assert(data);
 903
 904         x = log_facility_unshifted_from_string(rvalue);
 905         if (x < 0) {
 906                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 907                 return 0;
 908         }
 909
 910         *o = (x << 3) | LOG_PRI(*o);
 911
 912         return 0;
 913 }
 914 #endif // 0
 915
 916 int config_parse_log_level(
 917                 const char *unit,
 918                 const char *filename,
 919                 unsigned line,
 920                 const char *section,
 921                 unsigned section_line,
 922                 const char *lvalue,
 923                 int ltype,
 924                 const char *rvalue,
 925                 void *data,
 926                 void *userdata) {
 927
 928         int *o = data, x;
 929
 930         assert(filename);
 931         assert(lvalue);
 932         assert(rvalue);
 933         assert(data);
 934
 935         x = log_level_from_string(rvalue);
 936         if (x < 0) {
 937                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 938                 return 0;
 939         }
 940
 941         if (*o < 0) /* if it wasn't initialized so far, assume zero facility */
 942                 *o = x;
 943         else
 944                 *o = (*o & LOG_FACMASK) | x;
 945
 946         return 0;
 947 }
 948
 949 int config_parse_signal(
 950                 const char *unit,
 951                 const char *filename,
 952                 unsigned line,
 953                 const char *section,
 954                 unsigned section_line,
 955                 const char *lvalue,
 956                 int ltype,
 957                 const char *rvalue,
 958                 void *data,
 959                 void *userdata) {
 960
 961         int *sig = data, r;
 962
 963         assert(filename);
 964         assert(lvalue);
 965         assert(rvalue);
 966         assert(sig);
 967
 968         r = signal_from_string(rvalue);
 969         if (r <= 0) {
 970                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 971                 return 0;
 972         }
 973
 974         *sig = r;
 975         return 0;
 976 }
 977
 978 #if 0 /// UNNEEDED by elogind
 979 int config_parse_personality(
 980                 const char *unit,
 981                 const char *filename,
 982                 unsigned line,
 983                 const char *section,
 984                 unsigned section_line,
 985                 const char *lvalue,
 986                 int ltype,
 987                 const char *rvalue,
 988                 void *data,
 989                 void *userdata) {
 990
 991         unsigned long *personality = data, p;
 992
 993         assert(filename);
 994         assert(lvalue);
 995         assert(rvalue);
 996         assert(personality);
 997
 998         if (isempty(rvalue))
 999                 p = PERSONALITY_INVALID;
1000         else {
1001                 p = personality_from_string(rvalue);
1002                 if (p == PERSONALITY_INVALID) {
1003                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
1004                         return 0;
1005                 }
1006         }
1007
1008         *personality = p;
1009         return 0;
1010 }
1011
1012 int config_parse_ifname(
1013                 const char *unit,
1014                 const char *filename,
1015                 unsigned line,
1016                 const char *section,
1017                 unsigned section_line,
1018                 const char *lvalue,
1019                 int ltype,
1020                 const char *rvalue,
1021                 void *data,
1022                 void *userdata) {
1023
1024         char **s = data;
1025         int r;
1026
1027         assert(filename);
1028         assert(lvalue);
1029         assert(rvalue);
1030         assert(data);
1031
1032         if (isempty(rvalue)) {
1033                 *s = mfree(*s);
1034                 return 0;
1035         }
1036
1037         if (!ifname_valid(rvalue)) {
1038                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
1039                 return 0;
1040         }
1041
1042         r = free_and_strdup(s, rvalue);
1043         if (r < 0)
1044                 return log_oom();
1045
1046         return 0;
1047 }
1048
1049 int config_parse_ip_port(
1050                 const char *unit,
1051                 const char *filename,
1052                 unsigned line,
1053                 const char *section,
1054                 unsigned section_line,
1055                 const char *lvalue,
1056                 int ltype,
1057                 const char *rvalue,
1058                 void *data,
1059                 void *userdata) {
1060
1061         uint16_t *s = data;
1062         uint16_t port;
1063         int r;
1064
1065         assert(filename);
1066         assert(lvalue);
1067         assert(rvalue);
1068         assert(data);
1069
1070         if (isempty(rvalue)) {
1071                 *s = 0;
1072                 return 0;
1073         }
1074
1075         r = parse_ip_port(rvalue, &port);
1076         if (r < 0) {
1077                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse port '%s'.", rvalue);
1078                 return 0;
1079         }
1080
1081         *s = port;
1082
1083         return 0;
1084 }
1085
1086 int config_parse_join_controllers(
1087                 const char *unit,
1088                 const char *filename,
1089                 unsigned line,
1090                 const char *section,
1091                 unsigned section_line,
1092                 const char *lvalue,
1093                 int ltype,
1094                 const char *rvalue,
1095                 void *data,
1096                 void *userdata) {
1097
1098         char ****ret = data;
1099         const char *whole_rvalue = rvalue;
1100         unsigned n = 0;
1101         _cleanup_(strv_free_freep) char ***controllers = NULL;
1102
1103         assert(filename);
1104         assert(lvalue);
1105         assert(rvalue);
1106         assert(ret);
1107
1108         for (;;) {
1109                 _cleanup_free_ char *word = NULL;
1110                 char **l;
1111                 int r;
1112
1113                 r = extract_first_word(&rvalue, &word, NULL, EXTRACT_QUOTES);
1114                 if (r < 0) {
1115                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid value for %s: %s", lvalue, whole_rvalue);
1116                         return r;
1117                 }
1118                 if (r == 0)
1119                         break;
1120
1121                 l = strv_split(word, ",");
1122                 if (!l)
1123                         return log_oom();
1124                 strv_uniq(l);
1125
1126                 if (strv_length(l) <= 1) {
1127                         strv_free(l);
1128                         continue;
1129                 }
1130
1131                 if (!controllers) {
1132                         controllers = new(char**, 2);
1133                         if (!controllers) {
1134                                 strv_free(l);
1135                                 return log_oom();
1136                         }
1137
1138                         controllers[0] = l;
1139                         controllers[1] = NULL;
1140
1141                         n = 1;
1142                 } else {
1143                         char ***a;
1144                         char ***t;
1145
1146                         t = new0(char**, n+2);
1147                         if (!t) {
1148                                 strv_free(l);
1149                                 return log_oom();
1150                         }
1151
1152                         n = 0;
1153
1154                         for (a = controllers; *a; a++)
1155                                 if (strv_overlap(*a, l)) {
1156                                         if (strv_extend_strv(&l, *a, false) < 0) {
1157                                                 strv_free(l);
1158                                                 strv_free_free(t);
1159                                                 return log_oom();
1160                                         }
1161
1162                                 } else {
1163                                         char **c;
1164
1165                                         c = strv_copy(*a);
1166                                         if (!c) {
1167                                                 strv_free(l);
1168                                                 strv_free_free(t);
1169                                                 return log_oom();
1170                                         }
1171
1172                                         t[n++] = c;
1173                                 }
1174
1175                         t[n++] = strv_uniq(l);
1176
1177                         strv_free_free(controllers);
1178                         controllers = t;
1179                 }
1180         }
1181         if (!isempty(rvalue))
1182                 log_syntax(unit, LOG_ERR, filename, line, 0, "Trailing garbage, ignoring.");
1183
1184         /* As a special case, return a single empty strv, to override the default */
1185         if (!controllers) {
1186                 controllers = new(char**, 2);
1187                 if (!controllers)
1188                         return log_oom();
1189                 controllers[0] = strv_new(NULL, NULL);
1190                 if (!controllers[0])
1191                         return log_oom();
1192                 controllers[1] = NULL;
1193         }
1194
1195         strv_free_free(*ret);
1196         *ret = TAKE_PTR(controllers);
1197
1198         return 0;
1199 }
1200 #endif // 0
1201
1202 int config_parse_mtu(
1203                 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         uint32_t *mtu = data;
1215         int r;
1216
1217         assert(rvalue);
1218         assert(mtu);
1219
1220         r = parse_mtu(ltype, rvalue, mtu);
1221         if (r == -ERANGE) {
1222                 log_syntax(unit, LOG_ERR, filename, line, r,
1223                            "Maximum transfer unit (MTU) value out of range. Permitted range is %" PRIu32 "…%" PRIu32 ", ignoring: %s",
1224                            (uint32_t) (ltype == AF_INET6 ? IPV6_MIN_MTU : IPV4_MIN_MTU), (uint32_t) UINT32_MAX,
1225                            rvalue);
1226                 return 0;
1227         }
1228         if (r < 0) {
1229                 log_syntax(unit, LOG_ERR, filename, line, r,
1230                            "Failed to parse MTU value '%s', ignoring: %m", rvalue);
1231                 return 0;
1232         }
1233
1234         return 0;
1235 }
1236
1237 int config_parse_rlimit(
1238                 const char *unit,
1239                 const char *filename,
1240                 unsigned line,
1241                 const char *section,
1242                 unsigned section_line,
1243                 const char *lvalue,
1244                 int ltype,
1245                 const char *rvalue,
1246                 void *data,
1247                 void *userdata) {
1248
1249         struct rlimit **rl = data, d = {};
1250         int r;
1251
1252         assert(rvalue);
1253         assert(rl);
1254
1255         r = rlimit_parse(ltype, rvalue, &d);
1256         if (r == -EILSEQ) {
1257                 log_syntax(unit, LOG_WARNING, filename, line, r, "Soft resource limit chosen higher than hard limit, ignoring: %s", rvalue);
1258                 return 0;
1259         }
1260         if (r < 0) {
1261                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse resource value, ignoring: %s", rvalue);
1262                 return 0;
1263         }
1264
1265         if (rl[ltype])
1266                 *rl[ltype] = d;
1267         else {
1268                 rl[ltype] = newdup(struct rlimit, &d, 1);
1269                 if (!rl[ltype])
1270                         return log_oom();
1271         }
1272
1273         return 0;
1274 }