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, 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                 const char *rvalue,
 230                 void *data,
 231                 void *userdata) {
 232
 233         int *i = data;
 234         int r;
 235
 236         assert(filename);
 237         assert(lvalue);
 238         assert(rvalue);
 239         assert(data);
 240
 241         if ((r = safe_atoi(rvalue, i)) < 0) {
 242                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 243                 return r;
 244         }
 245
 246         return 0;
 247 }
 248
 249 int config_parse_uint64(
 250                 const char *filename,
 251                 unsigned line,
 252                 const char *section,
 253                 const char *lvalue,
 254                 const char *rvalue,
 255                 void *data,
 256                 void *userdata) {
 257
 258         uint64_t *u = data;
 259         int r;
 260
 261         assert(filename);
 262         assert(lvalue);
 263         assert(rvalue);
 264         assert(data);
 265
 266         if ((r = safe_atou64(rvalue, u)) < 0) {
 267                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 268                 return r;
 269         }
 270
 271         return 0;
 272 }
 273
 274 int config_parse_unsigned(
 275                 const char *filename,
 276                 unsigned line,
 277                 const char *section,
 278                 const char *lvalue,
 279                 const char *rvalue,
 280                 void *data,
 281                 void *userdata) {
 282
 283         unsigned *u = data;
 284         int r;
 285
 286         assert(filename);
 287         assert(lvalue);
 288         assert(rvalue);
 289         assert(data);
 290
 291         if ((r = safe_atou(rvalue, u)) < 0) {
 292                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 293                 return r;
 294         }
 295
 296         return 0;
 297 }
 298
 299 int config_parse_size(
 300                 const char *filename,
 301                 unsigned line,
 302                 const char *section,
 303                 const char *lvalue,
 304                 const char *rvalue,
 305                 void *data,
 306                 void *userdata) {
 307
 308         size_t *sz = data;
 309         unsigned u;
 310         int r;
 311
 312         assert(filename);
 313         assert(lvalue);
 314         assert(rvalue);
 315         assert(data);
 316
 317         if ((r = safe_atou(rvalue, &u)) < 0) {
 318                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 319                 return r;
 320         }
 321
 322         *sz = (size_t) u;
 323         return 0;
 324 }
 325
 326 int config_parse_bool(
 327                 const char *filename,
 328                 unsigned line,
 329                 const char *section,
 330                 const char *lvalue,
 331                 const char *rvalue,
 332                 void *data,
 333                 void *userdata) {
 334
 335         int k;
 336         bool *b = data;
 337
 338         assert(filename);
 339         assert(lvalue);
 340         assert(rvalue);
 341         assert(data);
 342
 343         if ((k = parse_boolean(rvalue)) < 0) {
 344                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 345                 return k;
 346         }
 347
 348         *b = !!k;
 349         return 0;
 350 }
 351
 352 int config_parse_string(
 353                 const char *filename,
 354                 unsigned line,
 355                 const char *section,
 356                 const char *lvalue,
 357                 const char *rvalue,
 358                 void *data,
 359                 void *userdata) {
 360
 361         char **s = data;
 362         char *n;
 363
 364         assert(filename);
 365         assert(lvalue);
 366         assert(rvalue);
 367         assert(data);
 368
 369         if (*rvalue) {
 370                 if (!(n = strdup(rvalue)))
 371                         return -ENOMEM;
 372         } else
 373                 n = NULL;
 374
 375         free(*s);
 376         *s = n;
 377
 378         return 0;
 379 }
 380
 381 int config_parse_path(
 382                 const char *filename,
 383                 unsigned line,
 384                 const char *section,
 385                 const char *lvalue,
 386                 const char *rvalue,
 387                 void *data,
 388                 void *userdata) {
 389
 390         char **s = data;
 391         char *n;
 392
 393         assert(filename);
 394         assert(lvalue);
 395         assert(rvalue);
 396         assert(data);
 397
 398         if (!path_is_absolute(rvalue)) {
 399                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 400                 return -EINVAL;
 401         }
 402
 403         if (!(n = strdup(rvalue)))
 404                 return -ENOMEM;
 405
 406         path_kill_slashes(n);
 407
 408         free(*s);
 409         *s = n;
 410
 411         return 0;
 412 }
 413
 414 int config_parse_strv(
 415                 const char *filename,
 416                 unsigned line,
 417                 const char *section,
 418                 const char *lvalue,
 419                 const char *rvalue,
 420                 void *data,
 421                 void *userdata) {
 422
 423         char*** sv = data;
 424         char **n;
 425         char *w;
 426         unsigned k;
 427         size_t l;
 428         char *state;
 429
 430         assert(filename);
 431         assert(lvalue);
 432         assert(rvalue);
 433         assert(data);
 434
 435         k = strv_length(*sv);
 436         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 437                 k++;
 438
 439         if (!(n = new(char*, k+1)))
 440                 return -ENOMEM;
 441
 442         if (*sv)
 443                 for (k = 0; (*sv)[k]; k++)
 444                         n[k] = (*sv)[k];
 445         else
 446                 k = 0;
 447
 448         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 449                 if (!(n[k++] = cunescape_length(w, l)))
 450                         goto fail;
 451
 452         n[k] = NULL;
 453         free(*sv);
 454         *sv = n;
 455
 456         return 0;
 457
 458 fail:
 459         for (; k > 0; k--)
 460                 free(n[k-1]);
 461         free(n);
 462
 463         return -ENOMEM;
 464 }
 465
 466 int config_parse_path_strv(
 467                 const char *filename,
 468                 unsigned line,
 469                 const char *section,
 470                 const char *lvalue,
 471                 const char *rvalue,
 472                 void *data,
 473                 void *userdata) {
 474
 475         char*** sv = data;
 476         char **n;
 477         char *w;
 478         unsigned k;
 479         size_t l;
 480         char *state;
 481         int r;
 482
 483         assert(filename);
 484         assert(lvalue);
 485         assert(rvalue);
 486         assert(data);
 487
 488         k = strv_length(*sv);
 489         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 490                 k++;
 491
 492         if (!(n = new(char*, k+1)))
 493                 return -ENOMEM;
 494
 495         k = 0;
 496         if (*sv)
 497                 for (; (*sv)[k]; k++)
 498                         n[k] = (*sv)[k];
 499
 500         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 501                 if (!(n[k] = cunescape_length(w, l))) {
 502                         r = -ENOMEM;
 503                         goto fail;
 504                 }
 505
 506                 if (!path_is_absolute(n[k])) {
 507                         log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 508                         r = -EINVAL;
 509                         goto fail;
 510                 }
 511
 512                 path_kill_slashes(n[k]);
 513
 514                 k++;
 515         }
 516
 517         n[k] = NULL;
 518         free(*sv);
 519         *sv = n;
 520
 521         return 0;
 522
 523 fail:
 524         free(n[k]);
 525         for (; k > 0; k--)
 526                 free(n[k-1]);
 527         free(n);
 528
 529         return r;
 530 }