src/conf-parser.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <string.h>
  23 #include <stdio.h>
  24 #include <errno.h>
  25 #include <assert.h>
  26 #include <stdlib.h>
  27
  28 #include "conf-parser.h"
  29 #include "util.h"
  30 #include "macro.h"
  31 #include "strv.h"
  32 #include "log.h"
  33
  34 int config_item_table_lookup(
  35                 void *table,
  36                 const char *section,
  37                 const char *lvalue,
  38                 ConfigParserCallback *func,
  39                 int *ltype,
  40                 void **data,
  41                 void *userdata) {
  42
  43         ConfigTableItem *t;
  44
  45         assert(table);
  46         assert(lvalue);
  47         assert(func);
  48         assert(ltype);
  49         assert(data);
  50
  51         for (t = table; t->lvalue; t++) {
  52
  53                 if (!streq(lvalue, t->lvalue))
  54                         continue;
  55
  56                 if (!streq_ptr(section, t->section))
  57                         continue;
  58
  59                 *func = t->parse;
  60                 *ltype = t->ltype;
  61                 *data = t->data;
  62                 return 1;
  63         }
  64
  65         return 0;
  66 }
  67
  68 int config_item_perf_lookup(
  69                 void *table,
  70                 const char *section,
  71                 const char *lvalue,
  72                 ConfigParserCallback *func,
  73                 int *ltype,
  74                 void **data,
  75                 void *userdata) {
  76
  77         ConfigPerfItemLookup lookup = (ConfigPerfItemLookup) table;
  78         const ConfigPerfItem *p;
  79
  80         assert(table);
  81         assert(lvalue);
  82         assert(func);
  83         assert(ltype);
  84         assert(data);
  85
  86         if (!section)
  87                 p = lookup(lvalue, strlen(lvalue));
  88         else {
  89                 char *key;
  90
  91                 key = join(section, ".", lvalue, NULL);
  92                 if (!key)
  93                         return -ENOMEM;
  94
  95                 p = lookup(key, strlen(key));
  96                 free(key);
  97         }
  98
  99         if (!p)
 100                 return 0;
 101
 102         *func = p->parse;
 103         *ltype = p->ltype;
 104         *data = (uint8_t*) userdata + p->offset;
 105         return 1;
 106 }
 107
 108 /* Run the user supplied parser for an assignment */
 109 static int next_assignment(
 110                 const char *filename,
 111                 unsigned line,
 112                 ConfigItemLookup lookup,
 113                 void *table,
 114                 const char *section,
 115                 const char *lvalue,
 116                 const char *rvalue,
 117                 bool relaxed,
 118                 void *userdata) {
 119
 120         ConfigParserCallback func = NULL;
 121         int ltype = 0;
 122         void *data = NULL;
 123         int r;
 124
 125         assert(filename);
 126         assert(line > 0);
 127         assert(lookup);
 128         assert(lvalue);
 129         assert(rvalue);
 130
 131         r = lookup(table, section, lvalue, &func, &ltype, &data, userdata);
 132         if (r < 0)
 133                 return r;
 134
 135         if (r > 0) {
 136                 if (func)
 137                         return func(filename, line, section, lvalue, ltype, rvalue, data, userdata);
 138
 139                 return 0;
 140         }
 141
 142         /* Warn about unknown non-extension fields. */
 143         if (!relaxed && !startswith(lvalue, "X-"))
 144                 log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, section);
 145
 146         return 0;
 147 }
 148
 149 /* Parse a variable assignment line */
 150 static int parse_line(
 151                 const char *filename,
 152                 unsigned line,
 153                 const char *sections,
 154                 ConfigItemLookup lookup,
 155                 void *table,
 156                 bool relaxed,
 157                 char **section,
 158                 char *l,
 159                 void *userdata) {
 160
 161         char *e;
 162
 163         assert(filename);
 164         assert(line > 0);
 165         assert(lookup);
 166         assert(l);
 167
 168         l = strstrip(l);
 169
 170         if (!*l)
 171                 return 0;
 172
 173         if (strchr(COMMENTS, *l))
 174                 return 0;
 175
 176         if (startswith(l, ".include ")) {
 177                 char *fn;
 178                 int r;
 179
 180                 fn = file_in_same_dir(filename, strstrip(l+9));
 181                 if (!fn)
 182                         return -ENOMEM;
 183
 184                 r = config_parse(fn, NULL, sections, lookup, table, relaxed, userdata);
 185                 free(fn);
 186
 187                 return r;
 188         }
 189
 190         if (*l == '[') {
 191                 size_t k;
 192                 char *n;
 193
 194                 k = strlen(l);
 195                 assert(k > 0);
 196
 197                 if (l[k-1] != ']') {
 198                         log_error("[%s:%u] Invalid section header.", filename, line);
 199                         return -EBADMSG;
 200                 }
 201
 202                 n = strndup(l+1, k-2);
 203                 if (!n)
 204                         return -ENOMEM;
 205
 206                 if (sections && !nulstr_contains(sections, n)) {
 207
 208                         if (!relaxed)
 209                                 log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n);
 210
 211                         free(n);
 212                         *section = NULL;
 213                 } else {
 214                         free(*section);
 215                         *section = n;
 216                 }
 217
 218                 return 0;
 219         }
 220
 221         if (sections && !*section)
 222                 return 0;
 223
 224         e = strchr(l, '=');
 225         if (!e) {
 226                 log_error("[%s:%u] Missing '='.", filename, line);
 227                 return -EBADMSG;
 228         }
 229
 230         *e = 0;
 231         e++;
 232
 233         return next_assignment(
 234                         filename,
 235                         line,
 236                         lookup,
 237                         table,
 238                         *section,
 239                         strstrip(l),
 240                         strstrip(e),
 241                         relaxed,
 242                         userdata);
 243 }
 244
 245 /* Go through the file and parse each line */
 246 int config_parse(
 247                 const char *filename,
 248                 FILE *f,
 249                 const char *sections,
 250                 ConfigItemLookup lookup,
 251                 void *table,
 252                 bool relaxed,
 253                 void *userdata) {
 254
 255         unsigned line = 0;
 256         char *section = NULL;
 257         int r;
 258         bool ours = false;
 259         char *continuation = NULL;
 260
 261         assert(filename);
 262         assert(lookup);
 263
 264         if (!f) {
 265                 f = fopen(filename, "re");
 266                 if (!f) {
 267                         r = -errno;
 268                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 269                         goto finish;
 270                 }
 271
 272                 ours = true;
 273         }
 274
 275         while (!feof(f)) {
 276                 char l[LINE_MAX], *p, *c = NULL, *e;
 277                 bool escaped = false;
 278
 279                 if (!fgets(l, sizeof(l), f)) {
 280                         if (feof(f))
 281                                 break;
 282
 283                         r = -errno;
 284                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 285                         goto finish;
 286                 }
 287
 288                 truncate_nl(l);
 289
 290                 if (continuation) {
 291                         c = strappend(continuation, l);
 292                         if (!c) {
 293                                 r = -ENOMEM;
 294                                 goto finish;
 295                         }
 296
 297                         free(continuation);
 298                         continuation = NULL;
 299                         p = c;
 300                 } else
 301                         p = l;
 302
 303                 for (e = p; *e; e++) {
 304                         if (escaped)
 305                                 escaped = false;
 306                         else if (*e == '\\')
 307                                 escaped = true;
 308                 }
 309
 310                 if (escaped) {
 311                         *(e-1) = ' ';
 312
 313                         if (c)
 314                                 continuation = c;
 315                         else {
 316                                 continuation = strdup(l);
 317                                 if (!c) {
 318                                         r = -ENOMEM;
 319                                         goto finish;
 320                                 }
 321                         }
 322
 323                         continue;
 324                 }
 325
 326                 r = parse_line(filename,
 327                                 ++line,
 328                                 sections,
 329                                 lookup,
 330                                 table,
 331                                 relaxed,
 332                                 &section,
 333                                 p,
 334                                 userdata);
 335                 free(c);
 336
 337                 if (r < 0)
 338                         goto finish;
 339         }
 340
 341         r = 0;
 342
 343 finish:
 344         free(section);
 345         free(continuation);
 346
 347         if (f && ours)
 348                 fclose(f);
 349
 350         return r;
 351 }
 352
 353 int config_parse_int(
 354                 const char *filename,
 355                 unsigned line,
 356                 const char *section,
 357                 const char *lvalue,
 358                 int ltype,
 359                 const char *rvalue,
 360                 void *data,
 361                 void *userdata) {
 362
 363         int *i = data;
 364         int r;
 365
 366         assert(filename);
 367         assert(lvalue);
 368         assert(rvalue);
 369         assert(data);
 370
 371         if ((r = safe_atoi(rvalue, i)) < 0) {
 372                 log_error("[%s:%u] Failed to parse numeric value, ingoring: %s", filename, line, rvalue);
 373                 return 0;
 374         }
 375
 376         return 0;
 377 }
 378
 379 int config_parse_long(
 380                 const char *filename,
 381                 unsigned line,
 382                 const char *section,
 383                 const char *lvalue,
 384                 int ltype,
 385                 const char *rvalue,
 386                 void *data,
 387                 void *userdata) {
 388
 389         long *i = data;
 390         int r;
 391
 392         assert(filename);
 393         assert(lvalue);
 394         assert(rvalue);
 395         assert(data);
 396
 397         if ((r = safe_atoli(rvalue, i)) < 0) {
 398                 log_error("[%s:%u] Failed to parse numeric value, ignoring: %s", filename, line, rvalue);
 399                 return 0;
 400         }
 401
 402         return 0;
 403 }
 404
 405 int config_parse_uint64(
 406                 const char *filename,
 407                 unsigned line,
 408                 const char *section,
 409                 const char *lvalue,
 410                 int ltype,
 411                 const char *rvalue,
 412                 void *data,
 413                 void *userdata) {
 414
 415         uint64_t *u = data;
 416         int r;
 417
 418         assert(filename);
 419         assert(lvalue);
 420         assert(rvalue);
 421         assert(data);
 422
 423         if ((r = safe_atou64(rvalue, u)) < 0) {
 424                 log_error("[%s:%u] Failed to parse numeric value, ignoring: %s", filename, line, rvalue);
 425                 return 0;
 426         }
 427
 428         return 0;
 429 }
 430
 431 int config_parse_unsigned(
 432                 const char *filename,
 433                 unsigned line,
 434                 const char *section,
 435                 const char *lvalue,
 436                 int ltype,
 437                 const char *rvalue,
 438                 void *data,
 439                 void *userdata) {
 440
 441         unsigned *u = data;
 442         int r;
 443
 444         assert(filename);
 445         assert(lvalue);
 446         assert(rvalue);
 447         assert(data);
 448
 449         if ((r = safe_atou(rvalue, u)) < 0) {
 450                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 451                 return r;
 452         }
 453
 454         return 0;
 455 }
 456
 457 int config_parse_size(
 458                 const char *filename,
 459                 unsigned line,
 460                 const char *section,
 461                 const char *lvalue,
 462                 int ltype,
 463                 const char *rvalue,
 464                 void *data,
 465                 void *userdata) {
 466
 467         size_t *sz = data;
 468         unsigned u;
 469         int r;
 470
 471         assert(filename);
 472         assert(lvalue);
 473         assert(rvalue);
 474         assert(data);
 475
 476         if ((r = safe_atou(rvalue, &u)) < 0) {
 477                 log_error("[%s:%u] Failed to parse numeric value, ignoring: %s", filename, line, rvalue);
 478                 return 0;
 479         }
 480
 481         *sz = (size_t) u;
 482         return 0;
 483 }
 484
 485 int config_parse_bool(
 486                 const char *filename,
 487                 unsigned line,
 488                 const char *section,
 489                 const char *lvalue,
 490                 int ltype,
 491                 const char *rvalue,
 492                 void *data,
 493                 void *userdata) {
 494
 495         int k;
 496         bool *b = data;
 497
 498         assert(filename);
 499         assert(lvalue);
 500         assert(rvalue);
 501         assert(data);
 502
 503         if ((k = parse_boolean(rvalue)) < 0) {
 504                 log_error("[%s:%u] Failed to parse boolean value, ignoring: %s", filename, line, rvalue);
 505                 return 0;
 506         }
 507
 508         *b = !!k;
 509         return 0;
 510 }
 511
 512 int config_parse_string(
 513                 const char *filename,
 514                 unsigned line,
 515                 const char *section,
 516                 const char *lvalue,
 517                 int ltype,
 518                 const char *rvalue,
 519                 void *data,
 520                 void *userdata) {
 521
 522         char **s = data;
 523         char *n;
 524
 525         assert(filename);
 526         assert(lvalue);
 527         assert(rvalue);
 528         assert(data);
 529
 530         if (*rvalue) {
 531                 if (!(n = strdup(rvalue)))
 532                         return -ENOMEM;
 533         } else
 534                 n = NULL;
 535
 536         free(*s);
 537         *s = n;
 538
 539         return 0;
 540 }
 541
 542 int config_parse_path(
 543                 const char *filename,
 544                 unsigned line,
 545                 const char *section,
 546                 const char *lvalue,
 547                 int ltype,
 548                 const char *rvalue,
 549                 void *data,
 550                 void *userdata) {
 551
 552         char **s = data;
 553         char *n;
 554
 555         assert(filename);
 556         assert(lvalue);
 557         assert(rvalue);
 558         assert(data);
 559
 560         if (!path_is_absolute(rvalue)) {
 561                 log_error("[%s:%u] Not an absolute path, ignoring: %s", filename, line, rvalue);
 562                 return 0;
 563         }
 564
 565         if (!(n = strdup(rvalue)))
 566                 return -ENOMEM;
 567
 568         path_kill_slashes(n);
 569
 570         free(*s);
 571         *s = n;
 572
 573         return 0;
 574 }
 575
 576 int config_parse_strv(
 577                 const char *filename,
 578                 unsigned line,
 579                 const char *section,
 580                 const char *lvalue,
 581                 int ltype,
 582                 const char *rvalue,
 583                 void *data,
 584                 void *userdata) {
 585
 586         char*** sv = data;
 587         char **n;
 588         char *w;
 589         unsigned k;
 590         size_t l;
 591         char *state;
 592
 593         assert(filename);
 594         assert(lvalue);
 595         assert(rvalue);
 596         assert(data);
 597
 598         k = strv_length(*sv);
 599         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 600                 k++;
 601
 602         if (!(n = new(char*, k+1)))
 603                 return -ENOMEM;
 604
 605         if (*sv)
 606                 for (k = 0; (*sv)[k]; k++)
 607                         n[k] = (*sv)[k];
 608         else
 609                 k = 0;
 610
 611         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 612                 if (!(n[k++] = cunescape_length(w, l)))
 613                         goto fail;
 614
 615         n[k] = NULL;
 616         free(*sv);
 617         *sv = n;
 618
 619         return 0;
 620
 621 fail:
 622         for (; k > 0; k--)
 623                 free(n[k-1]);
 624         free(n);
 625
 626         return -ENOMEM;
 627 }
 628
 629 int config_parse_path_strv(
 630                 const char *filename,
 631                 unsigned line,
 632                 const char *section,
 633                 const char *lvalue,
 634                 int ltype,
 635                 const char *rvalue,
 636                 void *data,
 637                 void *userdata) {
 638
 639         char*** sv = data;
 640         char **n;
 641         char *w;
 642         unsigned k;
 643         size_t l;
 644         char *state;
 645         int r;
 646
 647         assert(filename);
 648         assert(lvalue);
 649         assert(rvalue);
 650         assert(data);
 651
 652         k = strv_length(*sv);
 653         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 654                 k++;
 655
 656         if (!(n = new(char*, k+1)))
 657                 return -ENOMEM;
 658
 659         k = 0;
 660         if (*sv)
 661                 for (; (*sv)[k]; k++)
 662                         n[k] = (*sv)[k];
 663
 664         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 665                 if (!(n[k] = cunescape_length(w, l))) {
 666                         r = -ENOMEM;
 667                         goto fail;
 668                 }
 669
 670                 if (!path_is_absolute(n[k])) {
 671                         log_error("[%s:%u] Not an absolute path, ignoring: %s", filename, line, rvalue);
 672                         free(n[k]);
 673                         continue;
 674                 }
 675
 676                 path_kill_slashes(n[k]);
 677
 678                 k++;
 679         }
 680
 681         n[k] = NULL;
 682         free(*sv);
 683         *sv = n;
 684
 685         return 0;
 686
 687 fail:
 688         free(n[k]);
 689         for (; k > 0; k--)
 690                 free(n[k-1]);
 691         free(n);
 692
 693         return r;
 694 }
 695
 696 int config_parse_usec(
 697                 const char *filename,
 698                 unsigned line,
 699                 const char *section,
 700                 const char *lvalue,
 701                 int ltype,
 702                 const char *rvalue,
 703                 void *data,
 704                 void *userdata) {
 705
 706         usec_t *usec = data;
 707
 708         assert(filename);
 709         assert(lvalue);
 710         assert(rvalue);
 711         assert(data);
 712
 713         if (parse_usec(rvalue, usec) < 0) {
 714                 log_error("[%s:%u] Failed to parse time value, ignoring: %s", filename, line, rvalue);
 715                 return 0;
 716         }
 717
 718         return 0;
 719 }
 720
 721 int config_parse_mode(
 722                 const char *filename,
 723                 unsigned line,
 724                 const char *section,
 725                 const char *lvalue,
 726                 int ltype,
 727                 const char *rvalue,
 728                 void *data,
 729                 void *userdata) {
 730
 731         mode_t *m = data;
 732         long l;
 733         char *x = NULL;
 734
 735         assert(filename);
 736         assert(lvalue);
 737         assert(rvalue);
 738         assert(data);
 739
 740         errno = 0;
 741         l = strtol(rvalue, &x, 8);
 742         if (!x || *x || errno) {
 743                 log_error("[%s:%u] Failed to parse mode value, ignoring: %s", filename, line, rvalue);
 744                 return 0;
 745         }
 746
 747         if (l < 0000 || l > 07777) {
 748                 log_error("[%s:%u] mode value out of range, ignoring: %s", filename, line, rvalue);
 749                 return 0;
 750         }
 751
 752         *m = (mode_t) l;
 753         return 0;
 754 }