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 /* Run the user supplied parser for an assignment */
  35 static int next_assignment(
  36                 const char *filename,
  37                 unsigned line,
  38                 const char *section,
  39                 const ConfigItem *t,
  40                 bool relaxed,
  41                 const char *lvalue,
  42                 const char *rvalue,
  43                 void *userdata) {
  44
  45         assert(filename);
  46         assert(t);
  47         assert(lvalue);
  48         assert(rvalue);
  49
  50         for (; t->parse || t->lvalue; t++) {
  51
  52                 if (t->lvalue && !streq(lvalue, t->lvalue))
  53                         continue;
  54
  55                 if (t->section && !section)
  56                         continue;
  57
  58                 if (t->section && !streq(section, t->section))
  59                         continue;
  60
  61                 if (!t->parse)
  62                         return 0;
  63
  64                 return t->parse(filename, line, section, lvalue, t->ltype, rvalue, t->data, userdata);
  65         }
  66
  67         /* Warn about unknown non-extension fields. */
  68         if (!relaxed && !startswith(lvalue, "X-"))
  69                 log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
  70
  71         return 0;
  72 }
  73
  74 /* Parse a variable assignment line */
  75 static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, bool relaxed, char *l, void *userdata) {
  76         char *e;
  77
  78         l = strstrip(l);
  79
  80         if (!*l)
  81                 return 0;
  82
  83         if (strchr(COMMENTS, *l))
  84                 return 0;
  85
  86         if (startswith(l, ".include ")) {
  87                 char *fn;
  88                 int r;
  89
  90                 if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
  91                         return -ENOMEM;
  92
  93                 r = config_parse(fn, NULL, sections, t, relaxed, userdata);
  94                 free(fn);
  95
  96                 return r;
  97         }
  98
  99         if (*l == '[') {
 100                 size_t k;
 101                 char *n;
 102
 103                 k = strlen(l);
 104                 assert(k > 0);
 105
 106                 if (l[k-1] != ']') {
 107                         log_error("[%s:%u] Invalid section header.", filename, line);
 108                         return -EBADMSG;
 109                 }
 110
 111                 if (!(n = strndup(l+1, k-2)))
 112                         return -ENOMEM;
 113
 114                 if (!relaxed && sections && !strv_contains((char**) sections, n))
 115                         log_info("[%s:%u] Unknown section '%s'. Ignoring.", filename, line, n);
 116
 117                 free(*section);
 118                 *section = n;
 119
 120                 return 0;
 121         }
 122
 123         if (sections && (!*section || !strv_contains((char**) sections, *section)))
 124                 return 0;
 125
 126         if (!(e = strchr(l, '='))) {
 127                 log_error("[%s:%u] Missing '='.", filename, line);
 128                 return -EBADMSG;
 129         }
 130
 131         *e = 0;
 132         e++;
 133
 134         return next_assignment(filename, line, *section, t, relaxed, strstrip(l), strstrip(e), userdata);
 135 }
 136
 137 /* Go through the file and parse each line */
 138 int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, bool relaxed, void *userdata) {
 139         unsigned line = 0;
 140         char *section = NULL;
 141         int r;
 142         bool ours = false;
 143         char *continuation = NULL;
 144
 145         assert(filename);
 146         assert(t);
 147
 148         if (!f) {
 149                 if (!(f = fopen(filename, "re"))) {
 150                         r = -errno;
 151                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 152                         goto finish;
 153                 }
 154
 155                 ours = true;
 156         }
 157
 158         while (!feof(f)) {
 159                 char l[LINE_MAX], *p, *c = NULL, *e;
 160                 bool escaped = false;
 161
 162                 if (!fgets(l, sizeof(l), f)) {
 163                         if (feof(f))
 164                                 break;
 165
 166                         r = -errno;
 167                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 168                         goto finish;
 169                 }
 170
 171                 truncate_nl(l);
 172
 173                 if (continuation) {
 174                         if (!(c = strappend(continuation, l))) {
 175                                 r = -ENOMEM;
 176                                 goto finish;
 177                         }
 178
 179                         free(continuation);
 180                         continuation = NULL;
 181                         p = c;
 182                 } else
 183                         p = l;
 184
 185                 for (e = p; *e; e++) {
 186                         if (escaped)
 187                                 escaped = false;
 188                         else if (*e == '\\')
 189                                 escaped = true;
 190                 }
 191
 192                 if (escaped) {
 193                         *(e-1) = ' ';
 194
 195                         if (c)
 196                                 continuation = c;
 197                         else if (!(continuation = strdup(l))) {
 198                                 r = -ENOMEM;
 199                                 goto finish;
 200                         }
 201
 202                         continue;
 203                 }
 204
 205                 r = parse_line(filename, ++line, &section, sections, t, relaxed, p, userdata);
 206                 free(c);
 207
 208                 if (r < 0)
 209                         goto finish;
 210         }
 211
 212         r = 0;
 213
 214 finish:
 215         free(section);
 216         free(continuation);
 217
 218         if (f && ours)
 219                 fclose(f);
 220
 221         return r;
 222 }
 223
 224 int config_parse_int(
 225                 const char *filename,
 226                 unsigned line,
 227                 const char *section,
 228                 const char *lvalue,
 229                 int ltype,
 230                 const char *rvalue,
 231                 void *data,
 232                 void *userdata) {
 233
 234         int *i = data;
 235         int r;
 236
 237         assert(filename);
 238         assert(lvalue);
 239         assert(rvalue);
 240         assert(data);
 241
 242         if ((r = safe_atoi(rvalue, i)) < 0) {
 243                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 244                 return r;
 245         }
 246
 247         return 0;
 248 }
 249
 250 int config_parse_long(
 251                 const char *filename,
 252                 unsigned line,
 253                 const char *section,
 254                 const char *lvalue,
 255                 int ltype,
 256                 const char *rvalue,
 257                 void *data,
 258                 void *userdata) {
 259
 260         long *i = data;
 261         int r;
 262
 263         assert(filename);
 264         assert(lvalue);
 265         assert(rvalue);
 266         assert(data);
 267
 268         if ((r = safe_atoli(rvalue, i)) < 0) {
 269                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 270                 return r;
 271         }
 272
 273         return 0;
 274 }
 275
 276 int config_parse_uint64(
 277                 const char *filename,
 278                 unsigned line,
 279                 const char *section,
 280                 const char *lvalue,
 281                 int ltype,
 282                 const char *rvalue,
 283                 void *data,
 284                 void *userdata) {
 285
 286         uint64_t *u = data;
 287         int r;
 288
 289         assert(filename);
 290         assert(lvalue);
 291         assert(rvalue);
 292         assert(data);
 293
 294         if ((r = safe_atou64(rvalue, u)) < 0) {
 295                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 296                 return r;
 297         }
 298
 299         return 0;
 300 }
 301
 302 int config_parse_unsigned(
 303                 const char *filename,
 304                 unsigned line,
 305                 const char *section,
 306                 const char *lvalue,
 307                 int ltype,
 308                 const char *rvalue,
 309                 void *data,
 310                 void *userdata) {
 311
 312         unsigned *u = data;
 313         int r;
 314
 315         assert(filename);
 316         assert(lvalue);
 317         assert(rvalue);
 318         assert(data);
 319
 320         if ((r = safe_atou(rvalue, u)) < 0) {
 321                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 322                 return r;
 323         }
 324
 325         return 0;
 326 }
 327
 328 int config_parse_size(
 329                 const char *filename,
 330                 unsigned line,
 331                 const char *section,
 332                 const char *lvalue,
 333                 int ltype,
 334                 const char *rvalue,
 335                 void *data,
 336                 void *userdata) {
 337
 338         size_t *sz = data;
 339         unsigned u;
 340         int r;
 341
 342         assert(filename);
 343         assert(lvalue);
 344         assert(rvalue);
 345         assert(data);
 346
 347         if ((r = safe_atou(rvalue, &u)) < 0) {
 348                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 349                 return r;
 350         }
 351
 352         *sz = (size_t) u;
 353         return 0;
 354 }
 355
 356 int config_parse_bool(
 357                 const char *filename,
 358                 unsigned line,
 359                 const char *section,
 360                 const char *lvalue,
 361                 int ltype,
 362                 const char *rvalue,
 363                 void *data,
 364                 void *userdata) {
 365
 366         int k;
 367         bool *b = data;
 368
 369         assert(filename);
 370         assert(lvalue);
 371         assert(rvalue);
 372         assert(data);
 373
 374         if ((k = parse_boolean(rvalue)) < 0) {
 375                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 376                 return k;
 377         }
 378
 379         *b = !!k;
 380         return 0;
 381 }
 382
 383 int config_parse_string(
 384                 const char *filename,
 385                 unsigned line,
 386                 const char *section,
 387                 const char *lvalue,
 388                 int ltype,
 389                 const char *rvalue,
 390                 void *data,
 391                 void *userdata) {
 392
 393         char **s = data;
 394         char *n;
 395
 396         assert(filename);
 397         assert(lvalue);
 398         assert(rvalue);
 399         assert(data);
 400
 401         if (*rvalue) {
 402                 if (!(n = strdup(rvalue)))
 403                         return -ENOMEM;
 404         } else
 405                 n = NULL;
 406
 407         free(*s);
 408         *s = n;
 409
 410         return 0;
 411 }
 412
 413 int config_parse_path(
 414                 const char *filename,
 415                 unsigned line,
 416                 const char *section,
 417                 const char *lvalue,
 418                 int ltype,
 419                 const char *rvalue,
 420                 void *data,
 421                 void *userdata) {
 422
 423         char **s = data;
 424         char *n;
 425
 426         assert(filename);
 427         assert(lvalue);
 428         assert(rvalue);
 429         assert(data);
 430
 431         if (!path_is_absolute(rvalue)) {
 432                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 433                 return -EINVAL;
 434         }
 435
 436         if (!(n = strdup(rvalue)))
 437                 return -ENOMEM;
 438
 439         path_kill_slashes(n);
 440
 441         free(*s);
 442         *s = n;
 443
 444         return 0;
 445 }
 446
 447 int config_parse_strv(
 448                 const char *filename,
 449                 unsigned line,
 450                 const char *section,
 451                 const char *lvalue,
 452                 int ltype,
 453                 const char *rvalue,
 454                 void *data,
 455                 void *userdata) {
 456
 457         char*** sv = data;
 458         char **n;
 459         char *w;
 460         unsigned k;
 461         size_t l;
 462         char *state;
 463
 464         assert(filename);
 465         assert(lvalue);
 466         assert(rvalue);
 467         assert(data);
 468
 469         k = strv_length(*sv);
 470         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 471                 k++;
 472
 473         if (!(n = new(char*, k+1)))
 474                 return -ENOMEM;
 475
 476         if (*sv)
 477                 for (k = 0; (*sv)[k]; k++)
 478                         n[k] = (*sv)[k];
 479         else
 480                 k = 0;
 481
 482         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 483                 if (!(n[k++] = cunescape_length(w, l)))
 484                         goto fail;
 485
 486         n[k] = NULL;
 487         free(*sv);
 488         *sv = n;
 489
 490         return 0;
 491
 492 fail:
 493         for (; k > 0; k--)
 494                 free(n[k-1]);
 495         free(n);
 496
 497         return -ENOMEM;
 498 }
 499
 500 int config_parse_path_strv(
 501                 const char *filename,
 502                 unsigned line,
 503                 const char *section,
 504                 const char *lvalue,
 505                 int ltype,
 506                 const char *rvalue,
 507                 void *data,
 508                 void *userdata) {
 509
 510         char*** sv = data;
 511         char **n;
 512         char *w;
 513         unsigned k;
 514         size_t l;
 515         char *state;
 516         int r;
 517
 518         assert(filename);
 519         assert(lvalue);
 520         assert(rvalue);
 521         assert(data);
 522
 523         k = strv_length(*sv);
 524         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 525                 k++;
 526
 527         if (!(n = new(char*, k+1)))
 528                 return -ENOMEM;
 529
 530         k = 0;
 531         if (*sv)
 532                 for (; (*sv)[k]; k++)
 533                         n[k] = (*sv)[k];
 534
 535         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 536                 if (!(n[k] = cunescape_length(w, l))) {
 537                         r = -ENOMEM;
 538                         goto fail;
 539                 }
 540
 541                 if (!path_is_absolute(n[k])) {
 542                         log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 543                         r = -EINVAL;
 544                         goto fail;
 545                 }
 546
 547                 path_kill_slashes(n[k]);
 548
 549                 k++;
 550         }
 551
 552         n[k] = NULL;
 553         free(*sv);
 554         *sv = n;
 555
 556         return 0;
 557
 558 fail:
 559         free(n[k]);
 560         for (; k > 0; k--)
 561                 free(n[k-1]);
 562         free(n);
 563
 564         return r;
 565 }