src/shared/conf-parser.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/types.h>
  27
  28 #include "alloc-util.h"
  29 #include "conf-files.h"
  30 #include "conf-parser.h"
  31 #include "extract-word.h"
  32 #include "fd-util.h"
  33 #include "fs-util.h"
  34 #include "log.h"
  35 #include "macro.h"
  36 #include "parse-util.h"
  37 #include "path-util.h"
  38 #include "process-util.h"
  39 #include "signal-util.h"
  40 #include "string-util.h"
  41 #include "strv.h"
  42 #include "syslog-util.h"
  43 #include "time-util.h"
  44 #include "utf8.h"
  45
  46 int config_item_table_lookup(
  47                 const void *table,
  48                 const char *section,
  49                 const char *lvalue,
  50                 ConfigParserCallback *func,
  51                 int *ltype,
  52                 void **data,
  53                 void *userdata) {
  54
  55         const ConfigTableItem *t;
  56
  57         assert(table);
  58         assert(lvalue);
  59         assert(func);
  60         assert(ltype);
  61         assert(data);
  62
  63         for (t = table; t->lvalue; t++) {
  64
  65                 if (!streq(lvalue, t->lvalue))
  66                         continue;
  67
  68                 if (!streq_ptr(section, t->section))
  69                         continue;
  70
  71                 *func = t->parse;
  72                 *ltype = t->ltype;
  73                 *data = t->data;
  74                 return 1;
  75         }
  76
  77         return 0;
  78 }
  79
  80 int config_item_perf_lookup(
  81                 const void *table,
  82                 const char *section,
  83                 const char *lvalue,
  84                 ConfigParserCallback *func,
  85                 int *ltype,
  86                 void **data,
  87                 void *userdata) {
  88
  89         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  90         const ConfigPerfItem *p;
  91
  92         assert(table);
  93         assert(lvalue);
  94         assert(func);
  95         assert(ltype);
  96         assert(data);
  97
  98         if (!section)
  99                 p = lookup(lvalue, strlen(lvalue));
 100         else {
 101                 char *key;
 102
 103                 key = strjoin(section, ".", lvalue, NULL);
 104                 if (!key)
 105                         return -ENOMEM;
 106
 107                 p = lookup(key, strlen(key));
 108                 free(key);
 109         }
 110
 111         if (!p)
 112                 return 0;
 113
 114         *func = p->parse;
 115         *ltype = p->ltype;
 116         *data = (uint8_t*) userdata + p->offset;
 117         return 1;
 118 }
 119
 120 /* Run the user supplied parser for an assignment */
 121 static int next_assignment(const char *unit,
 122                            const char *filename,
 123                            unsigned line,
 124                            ConfigItemLookup lookup,
 125                            const void *table,
 126                            const char *section,
 127                            unsigned section_line,
 128                            const char *lvalue,
 129                            const char *rvalue,
 130                            bool relaxed,
 131                            void *userdata) {
 132
 133         ConfigParserCallback func = NULL;
 134         int ltype = 0;
 135         void *data = NULL;
 136         int r;
 137
 138         assert(filename);
 139         assert(line > 0);
 140         assert(lookup);
 141         assert(lvalue);
 142         assert(rvalue);
 143
 144         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 145         if (r < 0)
 146                 return r;
 147
 148         if (r > 0) {
 149                 if (func)
 150                         return func(unit, filename, line, section, section_line,
 151                                     lvalue, ltype, rvalue, data, userdata);
 152
 153                 return 0;
 154         }
 155
 156         /* Warn about unknown non-extension fields. */
 157         if (!relaxed && !startswith(lvalue, "X-"))
 158                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Unknown lvalue '%s' in section '%s'", lvalue, section);
 159
 160         return 0;
 161 }
 162
 163 /* Parse a variable assignment line */
 164 static int parse_line(const char* unit,
 165                       const char *filename,
 166                       unsigned line,
 167                       const char *sections,
 168                       ConfigItemLookup lookup,
 169                       const void *table,
 170                       bool relaxed,
 171                       bool allow_include,
 172                       char **section,
 173                       unsigned *section_line,
 174                       bool *section_ignored,
 175                       char *l,
 176                       void *userdata) {
 177
 178         char *e;
 179
 180         assert(filename);
 181         assert(line > 0);
 182         assert(lookup);
 183         assert(l);
 184
 185         l = strstrip(l);
 186
 187         if (!*l)
 188                 return 0;
 189
 190         if (strchr(COMMENTS "\n", *l))
 191                 return 0;
 192
 193         if (startswith(l, ".include ")) {
 194                 _cleanup_free_ char *fn = NULL;
 195
 196                 /* .includes are a bad idea, we only support them here
 197                  * for historical reasons. They create cyclic include
 198                  * problems and make it difficult to detect
 199                  * configuration file changes with an easy
 200                  * stat(). Better approaches, such as .d/ drop-in
 201                  * snippets exist.
 202                  *
 203                  * Support for them should be eventually removed. */
 204
 205                 if (!allow_include) {
 206                         log_syntax(unit, LOG_ERR, filename, line, 0, ".include not allowed here. Ignoring.");
 207                         return 0;
 208                 }
 209
 210                 fn = file_in_same_dir(filename, strstrip(l+9));
 211                 if (!fn)
 212                         return -ENOMEM;
 213
 214                 return config_parse(unit, fn, NULL, sections, lookup, table, relaxed, false, false, userdata);
 215         }
 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 (!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(*section);
 244                         *section = n;
 245                         *section_line = line;
 246                         *section_ignored = false;
 247                 }
 248
 249                 return 0;
 250         }
 251
 252         if (sections && !*section) {
 253
 254                 if (!relaxed && !*section_ignored)
 255                         log_syntax(unit, LOG_WARNING, filename, line, 0, "Assignment outside of section. Ignoring.");
 256
 257                 return 0;
 258         }
 259
 260         e = strchr(l, '=');
 261         if (!e) {
 262                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Missing '='.");
 263                 return -EINVAL;
 264         }
 265
 266         *e = 0;
 267         e++;
 268
 269         return next_assignment(unit,
 270                                filename,
 271                                line,
 272                                lookup,
 273                                table,
 274                                *section,
 275                                *section_line,
 276                                strstrip(l),
 277                                strstrip(e),
 278                                relaxed,
 279                                userdata);
 280 }
 281
 282 /* Go through the file and parse each line */
 283 int config_parse(const char *unit,
 284                  const char *filename,
 285                  FILE *f,
 286                  const char *sections,
 287                  ConfigItemLookup lookup,
 288                  const void *table,
 289                  bool relaxed,
 290                  bool allow_include,
 291                  bool warn,
 292                  void *userdata) {
 293
 294         _cleanup_free_ char *section = NULL, *continuation = NULL;
 295         _cleanup_fclose_ FILE *ours = NULL;
 296         unsigned line = 0, section_line = 0;
 297         bool section_ignored = false, allow_bom = true;
 298         int r;
 299
 300         assert(filename);
 301         assert(lookup);
 302
 303         if (!f) {
 304                 f = ours = fopen(filename, "re");
 305                 if (!f) {
 306                         /* Only log on request, except for ENOENT,
 307                          * since we return 0 to the caller. */
 308                         if (warn || errno == ENOENT)
 309                                 log_full(errno == ENOENT ? LOG_DEBUG : LOG_ERR,
 310                                          "Failed to open configuration file '%s': %m", filename);
 311                         return errno == ENOENT ? 0 : -errno;
 312                 }
 313         }
 314
 315         fd_warn_permissions(filename, fileno(f));
 316
 317         for (;;) {
 318                 char buf[LINE_MAX], *l, *p, *c = NULL, *e;
 319                 bool escaped = false;
 320
 321                 if (!fgets(buf, sizeof buf, f)) {
 322                         if (feof(f))
 323                                 break;
 324
 325                         return log_error_errno(errno, "Failed to read configuration file '%s': %m", filename);
 326                 }
 327
 328                 l = buf;
 329                 if (allow_bom && startswith(l, UTF8_BYTE_ORDER_MARK))
 330                         l += strlen(UTF8_BYTE_ORDER_MARK);
 331                 allow_bom = false;
 332
 333                 truncate_nl(l);
 334
 335                 if (continuation) {
 336                         c = strappend(continuation, l);
 337                         if (!c) {
 338                                 if (warn)
 339                                         log_oom();
 340                                 return -ENOMEM;
 341                         }
 342
 343                         continuation = mfree(continuation);
 344                         p = c;
 345                 } else
 346                         p = l;
 347
 348                 for (e = p; *e; e++) {
 349                         if (escaped)
 350                                 escaped = false;
 351                         else if (*e == '\\')
 352                                 escaped = true;
 353                 }
 354
 355                 if (escaped) {
 356                         *(e-1) = ' ';
 357
 358                         if (c)
 359                                 continuation = c;
 360                         else {
 361                                 continuation = strdup(l);
 362                                 if (!continuation) {
 363                                         if (warn)
 364                                                 log_oom();
 365                                         return -ENOMEM;
 366                                 }
 367                         }
 368
 369                         continue;
 370                 }
 371
 372                 r = parse_line(unit,
 373                                filename,
 374                                ++line,
 375                                sections,
 376                                lookup,
 377                                table,
 378                                relaxed,
 379                                allow_include,
 380                                &section,
 381                                &section_line,
 382                                &section_ignored,
 383                                p,
 384                                userdata);
 385                 free(c);
 386
 387                 if (r < 0) {
 388                         if (warn)
 389                                 log_warning_errno(r, "Failed to parse file '%s': %m",
 390                                                   filename);
 391                         return r;
 392                 }
 393         }
 394
 395         return 0;
 396 }
 397
 398 /* Parse each config file in the specified directories. */
 399 int config_parse_many_nulstr(
 400                 const char *conf_file,
 401                 const char *conf_file_dirs,
 402                 const char *sections,
 403                 ConfigItemLookup lookup,
 404                 const void *table,
 405                 bool relaxed,
 406                 void *userdata) {
 407
 408         _cleanup_strv_free_ char **files = NULL;
 409         char **fn;
 410         int r;
 411
 412         r = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
 413         if (r < 0)
 414                 return r;
 415
 416         if (conf_file) {
 417                 r = config_parse(NULL, conf_file, NULL, sections, lookup, table, relaxed, false, true, userdata);
 418                 if (r < 0)
 419                         return r;
 420         }
 421
 422         STRV_FOREACH(fn, files) {
 423                 r = config_parse(NULL, *fn, NULL, sections, lookup, table, relaxed, false, true, userdata);
 424                 if (r < 0)
 425                         return r;
 426         }
 427
 428         return 0;
 429 }
 430
 431 #define DEFINE_PARSER(type, vartype, conv_func)                         \
 432         int config_parse_##type(                                        \
 433                         const char *unit,                               \
 434                         const char *filename,                           \
 435                         unsigned line,                                  \
 436                         const char *section,                            \
 437                         unsigned section_line,                          \
 438                         const char *lvalue,                             \
 439                         int ltype,                                      \
 440                         const char *rvalue,                             \
 441                         void *data,                                     \
 442                         void *userdata) {                               \
 443                                                                         \
 444                 vartype *i = data;                                      \
 445                 int r;                                                  \
 446                                                                         \
 447                 assert(filename);                                       \
 448                 assert(lvalue);                                         \
 449                 assert(rvalue);                                         \
 450                 assert(data);                                           \
 451                                                                         \
 452                 r = conv_func(rvalue, i);                               \
 453                 if (r < 0)                                              \
 454                         log_syntax(unit, LOG_ERR, filename, line, r,    \
 455                                    "Failed to parse %s value, ignoring: %s", \
 456                                    #type, rvalue);                      \
 457                                                                         \
 458                 return 0;                                               \
 459         }                                                               \
 460         struct __useless_struct_to_allow_trailing_semicolon__
 461
 462 DEFINE_PARSER(int, int, safe_atoi);
 463 DEFINE_PARSER(long, long, safe_atoli);
 464 DEFINE_PARSER(uint16, uint16_t, safe_atou16);
 465 DEFINE_PARSER(uint32, uint32_t, safe_atou32);
 466 DEFINE_PARSER(uint64, uint64_t, safe_atou64);
 467 DEFINE_PARSER(unsigned, unsigned, safe_atou);
 468 DEFINE_PARSER(double, double, safe_atod);
 469 #if 0 /// UNNEEDED by elogind
 470 DEFINE_PARSER(nsec, nsec_t, parse_nsec);
 471 #endif // 0
 472 DEFINE_PARSER(sec, usec_t, parse_sec);
 473 DEFINE_PARSER(mode, mode_t, parse_mode);
 474
 475 int config_parse_iec_size(const char* unit,
 476                             const char *filename,
 477                             unsigned line,
 478                             const char *section,
 479                             unsigned section_line,
 480                             const char *lvalue,
 481                             int ltype,
 482                             const char *rvalue,
 483                             void *data,
 484                             void *userdata) {
 485
 486         size_t *sz = data;
 487         uint64_t v;
 488         int r;
 489
 490         assert(filename);
 491         assert(lvalue);
 492         assert(rvalue);
 493         assert(data);
 494
 495         r = parse_size(rvalue, 1024, &v);
 496         if (r < 0 || (uint64_t) (size_t) v != v) {
 497                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 498                 return 0;
 499         }
 500
 501         *sz = (size_t) v;
 502         return 0;
 503 }
 504
 505 #if 0 /// UNNEEDED by elogind
 506 int config_parse_si_size(const char* unit,
 507                             const char *filename,
 508                             unsigned line,
 509                             const char *section,
 510                             unsigned section_line,
 511                             const char *lvalue,
 512                             int ltype,
 513                             const char *rvalue,
 514                             void *data,
 515                             void *userdata) {
 516
 517         size_t *sz = data;
 518         uint64_t v;
 519         int r;
 520
 521         assert(filename);
 522         assert(lvalue);
 523         assert(rvalue);
 524         assert(data);
 525
 526         r = parse_size(rvalue, 1000, &v);
 527         if (r < 0 || (uint64_t) (size_t) v != v) {
 528                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 529                 return 0;
 530         }
 531
 532         *sz = (size_t) v;
 533         return 0;
 534 }
 535
 536 int config_parse_iec_uint64(const char* unit,
 537                            const char *filename,
 538                            unsigned line,
 539                            const char *section,
 540                            unsigned section_line,
 541                            const char *lvalue,
 542                            int ltype,
 543                            const char *rvalue,
 544                            void *data,
 545                            void *userdata) {
 546
 547         uint64_t *bytes = data;
 548         int r;
 549
 550         assert(filename);
 551         assert(lvalue);
 552         assert(rvalue);
 553         assert(data);
 554
 555         r = parse_size(rvalue, 1024, bytes);
 556         if (r < 0)
 557                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value, ignoring: %s", rvalue);
 558
 559         return 0;
 560 }
 561 #endif // 0
 562
 563 int config_parse_bool(const char* unit,
 564                       const char *filename,
 565                       unsigned line,
 566                       const char *section,
 567                       unsigned section_line,
 568                       const char *lvalue,
 569                       int ltype,
 570                       const char *rvalue,
 571                       void *data,
 572                       void *userdata) {
 573
 574         int k;
 575         bool *b = data;
 576
 577         assert(filename);
 578         assert(lvalue);
 579         assert(rvalue);
 580         assert(data);
 581
 582         k = parse_boolean(rvalue);
 583         if (k < 0) {
 584                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 585                 return 0;
 586         }
 587
 588         *b = !!k;
 589         return 0;
 590 }
 591
 592 #if 0 /// UNNEEDED by elogind
 593 int config_parse_tristate(
 594                 const char* unit,
 595                 const char *filename,
 596                 unsigned line,
 597                 const char *section,
 598                 unsigned section_line,
 599                 const char *lvalue,
 600                 int ltype,
 601                 const char *rvalue,
 602                 void *data,
 603                 void *userdata) {
 604
 605         int k, *t = data;
 606
 607         assert(filename);
 608         assert(lvalue);
 609         assert(rvalue);
 610         assert(data);
 611
 612         /* A tristate is pretty much a boolean, except that it can
 613          * also take the special value -1, indicating "uninitialized",
 614          * much like NULL is for a pointer type. */
 615
 616         k = parse_boolean(rvalue);
 617         if (k < 0) {
 618                 log_syntax(unit, LOG_ERR, filename, line, k, "Failed to parse boolean value, ignoring: %s", rvalue);
 619                 return 0;
 620         }
 621
 622         *t = !!k;
 623         return 0;
 624 }
 625 #endif // 0
 626
 627 int config_parse_string(
 628                 const char *unit,
 629                 const char *filename,
 630                 unsigned line,
 631                 const char *section,
 632                 unsigned section_line,
 633                 const char *lvalue,
 634                 int ltype,
 635                 const char *rvalue,
 636                 void *data,
 637                 void *userdata) {
 638
 639         char **s = data, *n;
 640
 641         assert(filename);
 642         assert(lvalue);
 643         assert(rvalue);
 644         assert(data);
 645
 646         if (!utf8_is_valid(rvalue)) {
 647                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 648                 return 0;
 649         }
 650
 651         if (isempty(rvalue))
 652                 n = NULL;
 653         else {
 654                 n = strdup(rvalue);
 655                 if (!n)
 656                         return log_oom();
 657         }
 658
 659         free(*s);
 660         *s = n;
 661
 662         return 0;
 663 }
 664
 665 int config_parse_path(
 666                 const char *unit,
 667                 const char *filename,
 668                 unsigned line,
 669                 const char *section,
 670                 unsigned section_line,
 671                 const char *lvalue,
 672                 int ltype,
 673                 const char *rvalue,
 674                 void *data,
 675                 void *userdata) {
 676
 677         char **s = data, *n;
 678
 679         assert(filename);
 680         assert(lvalue);
 681         assert(rvalue);
 682         assert(data);
 683
 684         if (!utf8_is_valid(rvalue)) {
 685                 log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 686                 return 0;
 687         }
 688
 689         if (!path_is_absolute(rvalue)) {
 690                 log_syntax(unit, LOG_ERR, filename, line, 0, "Not an absolute path, ignoring: %s", rvalue);
 691                 return 0;
 692         }
 693
 694         n = strdup(rvalue);
 695         if (!n)
 696                 return log_oom();
 697
 698         path_kill_slashes(n);
 699
 700         free(*s);
 701         *s = n;
 702
 703         return 0;
 704 }
 705
 706 int config_parse_strv(const char *unit,
 707                       const char *filename,
 708                       unsigned line,
 709                       const char *section,
 710                       unsigned section_line,
 711                       const char *lvalue,
 712                       int ltype,
 713                       const char *rvalue,
 714                       void *data,
 715                       void *userdata) {
 716
 717         char ***sv = data;
 718         int r;
 719
 720         assert(filename);
 721         assert(lvalue);
 722         assert(rvalue);
 723         assert(data);
 724
 725         if (isempty(rvalue)) {
 726                 char **empty;
 727
 728                 /* Empty assignment resets the list. As a special rule
 729                  * we actually fill in a real empty array here rather
 730                  * than NULL, since some code wants to know if
 731                  * something was set at all... */
 732                 empty = new0(char*, 1);
 733                 if (!empty)
 734                         return log_oom();
 735
 736                 strv_free(*sv);
 737                 *sv = empty;
 738
 739                 return 0;
 740         }
 741
 742         for (;;) {
 743                 char *word = NULL;
 744
 745                 r = extract_first_word(&rvalue, &word, WHITESPACE, EXTRACT_QUOTES|EXTRACT_RETAIN_ESCAPE);
 746                 if (r == 0)
 747                         break;
 748                 if (r == -ENOMEM)
 749                         return log_oom();
 750                 if (r < 0) {
 751                         log_syntax(unit, LOG_ERR, filename, line, r, "Invalid syntax, ignoring: %s", rvalue);
 752                         break;
 753                 }
 754
 755                 if (!utf8_is_valid(word)) {
 756                         log_syntax_invalid_utf8(unit, LOG_ERR, filename, line, rvalue);
 757                         free(word);
 758                         continue;
 759                 }
 760                 r = strv_consume(sv, word);
 761                 if (r < 0)
 762                         return log_oom();
 763         }
 764
 765         return 0;
 766 }
 767
 768 #if 0 /// UNNEEDED by elogind
 769 int config_parse_log_facility(
 770                 const char *unit,
 771                 const char *filename,
 772                 unsigned line,
 773                 const char *section,
 774                 unsigned section_line,
 775                 const char *lvalue,
 776                 int ltype,
 777                 const char *rvalue,
 778                 void *data,
 779                 void *userdata) {
 780
 781
 782         int *o = data, x;
 783
 784         assert(filename);
 785         assert(lvalue);
 786         assert(rvalue);
 787         assert(data);
 788
 789         x = log_facility_unshifted_from_string(rvalue);
 790         if (x < 0) {
 791                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log facility, ignoring: %s", rvalue);
 792                 return 0;
 793         }
 794
 795         *o = (x << 3) | LOG_PRI(*o);
 796
 797         return 0;
 798 }
 799 #endif // 0
 800
 801 int config_parse_log_level(
 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
 814         int *o = data, x;
 815
 816         assert(filename);
 817         assert(lvalue);
 818         assert(rvalue);
 819         assert(data);
 820
 821         x = log_level_from_string(rvalue);
 822         if (x < 0) {
 823                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse log level, ignoring: %s", rvalue);
 824                 return 0;
 825         }
 826
 827         *o = (*o & LOG_FACMASK) | x;
 828         return 0;
 829 }
 830
 831 int config_parse_signal(
 832                 const char *unit,
 833                 const char *filename,
 834                 unsigned line,
 835                 const char *section,
 836                 unsigned section_line,
 837                 const char *lvalue,
 838                 int ltype,
 839                 const char *rvalue,
 840                 void *data,
 841                 void *userdata) {
 842
 843         int *sig = data, r;
 844
 845         assert(filename);
 846         assert(lvalue);
 847         assert(rvalue);
 848         assert(sig);
 849
 850         r = signal_from_string_try_harder(rvalue);
 851         if (r <= 0) {
 852                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse signal name, ignoring: %s", rvalue);
 853                 return 0;
 854         }
 855
 856         *sig = r;
 857         return 0;
 858 }
 859
 860 #if 0 /// UNNEEDED by elogind
 861 int config_parse_personality(
 862                 const char *unit,
 863                 const char *filename,
 864                 unsigned line,
 865                 const char *section,
 866                 unsigned section_line,
 867                 const char *lvalue,
 868                 int ltype,
 869                 const char *rvalue,
 870                 void *data,
 871                 void *userdata) {
 872
 873         unsigned long *personality = data, p;
 874
 875         assert(filename);
 876         assert(lvalue);
 877         assert(rvalue);
 878         assert(personality);
 879
 880         p = personality_from_string(rvalue);
 881         if (p == PERSONALITY_INVALID) {
 882                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse personality, ignoring: %s", rvalue);
 883                 return 0;
 884         }
 885
 886         *personality = p;
 887         return 0;
 888 }
 889
 890 int config_parse_ifname(
 891                 const char *unit,
 892                 const char *filename,
 893                 unsigned line,
 894                 const char *section,
 895                 unsigned section_line,
 896                 const char *lvalue,
 897                 int ltype,
 898                 const char *rvalue,
 899                 void *data,
 900                 void *userdata) {
 901
 902         char **s = data;
 903         int r;
 904
 905         assert(filename);
 906         assert(lvalue);
 907         assert(rvalue);
 908         assert(data);
 909
 910         if (isempty(rvalue)) {
 911                 *s = mfree(*s);
 912                 return 0;
 913         }
 914
 915         if (!ifname_valid(rvalue)) {
 916                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface name is not valid or too long, ignoring assignment: %s", rvalue);
 917                 return 0;
 918         }
 919
 920         r = free_and_strdup(s, rvalue);
 921         if (r < 0)
 922                 return log_oom();
 923
 924         return 0;
 925 }
 926 #endif // 0