conf-parser.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   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 #define COMMENTS "#;\n"
  35 #define LINE_MAX 4096
  36
  37 /* Run the user supplied parser for an assignment */
  38 static int next_assignment(
  39                 const char *filename,
  40                 unsigned line,
  41                 const char *section,
  42                 const ConfigItem *t,
  43                 const char *lvalue,
  44                 const char *rvalue,
  45                 void *userdata) {
  46
  47         assert(filename);
  48         assert(t);
  49         assert(lvalue);
  50         assert(rvalue);
  51
  52         for (; t->parse; t++) {
  53
  54                 if (t->lvalue && !streq(lvalue, t->lvalue))
  55                         continue;
  56
  57                 if (t->section && !section)
  58                         continue;
  59
  60                 if (t->section && !streq(section, t->section))
  61                         continue;
  62
  63                 return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
  64         }
  65
  66         /* Warn about unknown non-extension fields. */
  67         if (!startswith(lvalue, "X-"))
  68                 log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
  69
  70         return 0;
  71 }
  72
  73 /* Parse a variable assignment line */
  74 static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, char *l, void *userdata) {
  75         char *e;
  76
  77         l = strstrip(l);
  78
  79         if (!*l)
  80                 return 0;
  81
  82         if (strchr(COMMENTS, *l))
  83                 return 0;
  84
  85         if (startswith(l, ".include ")) {
  86                 char *fn;
  87                 int r;
  88
  89                 if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
  90                         return -ENOMEM;
  91
  92                 r = config_parse(fn, NULL, sections, t, userdata);
  93                 free(fn);
  94
  95                 return r;
  96         }
  97
  98         if (*l == '[') {
  99                 size_t k;
 100                 char *n;
 101
 102                 k = strlen(l);
 103                 assert(k > 0);
 104
 105                 if (l[k-1] != ']') {
 106                         log_error("[%s:%u] Invalid section header.", filename, line);
 107                         return -EBADMSG;
 108                 }
 109
 110                 if (!(n = strndup(l+1, k-2)))
 111                         return -ENOMEM;
 112
 113                 if (sections && !strv_contains((char**) sections, n)) {
 114                         log_error("[%s:%u] Unknown section '%s'.", filename, line, n);
 115                         free(n);
 116                         return -EBADMSG;
 117                 }
 118
 119                 free(*section);
 120                 *section = n;
 121
 122                 return 0;
 123         }
 124
 125         if (!(e = strchr(l, '='))) {
 126                 log_error("[%s:%u] Missing '='.", filename, line);
 127                 return -EBADMSG;
 128         }
 129
 130         *e = 0;
 131         e++;
 132
 133         return next_assignment(filename, line, *section, t, strstrip(l), strstrip(e), userdata);
 134 }
 135
 136 /* Go through the file and parse each line */
 137 int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
 138         unsigned line = 0;
 139         char *section = NULL;
 140         int r;
 141         bool ours = false;
 142
 143         assert(filename);
 144         assert(t);
 145
 146         if (!f) {
 147                 if (!(f = fopen(filename, "re"))) {
 148                         r = -errno;
 149                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 150                         goto finish;
 151                 }
 152
 153                 ours = true;
 154         }
 155
 156         while (!feof(f)) {
 157                 char l[LINE_MAX];
 158
 159                 if (!fgets(l, sizeof(l), f)) {
 160                         if (feof(f))
 161                                 break;
 162
 163                         r = -errno;
 164                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 165                         goto finish;
 166                 }
 167
 168                 if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
 169                         goto finish;
 170         }
 171
 172         r = 0;
 173
 174 finish:
 175         free(section);
 176
 177         if (f && ours)
 178                 fclose(f);
 179
 180         return r;
 181 }
 182
 183 int config_parse_int(
 184                 const char *filename,
 185                 unsigned line,
 186                 const char *section,
 187                 const char *lvalue,
 188                 const char *rvalue,
 189                 void *data,
 190                 void *userdata) {
 191
 192         int *i = data;
 193         int r;
 194
 195         assert(filename);
 196         assert(lvalue);
 197         assert(rvalue);
 198         assert(data);
 199
 200         if ((r = safe_atoi(rvalue, i)) < 0) {
 201                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 202                 return r;
 203         }
 204
 205         return 0;
 206 }
 207
 208 int config_parse_unsigned(
 209                 const char *filename,
 210                 unsigned line,
 211                 const char *section,
 212                 const char *lvalue,
 213                 const char *rvalue,
 214                 void *data,
 215                 void *userdata) {
 216
 217         unsigned *u = data;
 218         int r;
 219
 220         assert(filename);
 221         assert(lvalue);
 222         assert(rvalue);
 223         assert(data);
 224
 225         if ((r = safe_atou(rvalue, u)) < 0) {
 226                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 227                 return r;
 228         }
 229
 230         return 0;
 231 }
 232
 233 int config_parse_size(
 234                 const char *filename,
 235                 unsigned line,
 236                 const char *section,
 237                 const char *lvalue,
 238                 const char *rvalue,
 239                 void *data,
 240                 void *userdata) {
 241
 242         size_t *sz = data;
 243         unsigned u;
 244         int r;
 245
 246         assert(filename);
 247         assert(lvalue);
 248         assert(rvalue);
 249         assert(data);
 250
 251         if ((r = safe_atou(rvalue, &u)) < 0) {
 252                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 253                 return r;
 254         }
 255
 256         *sz = (size_t) u;
 257         return 0;
 258 }
 259
 260 int config_parse_bool(
 261                 const char *filename,
 262                 unsigned line,
 263                 const char *section,
 264                 const char *lvalue,
 265                 const char *rvalue,
 266                 void *data,
 267                 void *userdata) {
 268
 269         int k;
 270         bool *b = data;
 271
 272         assert(filename);
 273         assert(lvalue);
 274         assert(rvalue);
 275         assert(data);
 276
 277         if ((k = parse_boolean(rvalue)) < 0) {
 278                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 279                 return k;
 280         }
 281
 282         *b = !!k;
 283         return 0;
 284 }
 285
 286 int config_parse_string(
 287                 const char *filename,
 288                 unsigned line,
 289                 const char *section,
 290                 const char *lvalue,
 291                 const char *rvalue,
 292                 void *data,
 293                 void *userdata) {
 294
 295         char **s = data;
 296         char *n;
 297
 298         assert(filename);
 299         assert(lvalue);
 300         assert(rvalue);
 301         assert(data);
 302
 303         if (*rvalue) {
 304                 if (!(n = strdup(rvalue)))
 305                         return -ENOMEM;
 306         } else
 307                 n = NULL;
 308
 309         free(*s);
 310         *s = n;
 311
 312         return 0;
 313 }
 314
 315 int config_parse_path(
 316                 const char *filename,
 317                 unsigned line,
 318                 const char *section,
 319                 const char *lvalue,
 320                 const char *rvalue,
 321                 void *data,
 322                 void *userdata) {
 323
 324         char **s = data;
 325         char *n;
 326
 327         assert(filename);
 328         assert(lvalue);
 329         assert(rvalue);
 330         assert(data);
 331
 332         if (!path_is_absolute(rvalue)) {
 333                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 334                 return -EINVAL;
 335         }
 336
 337         if (!(n = strdup(rvalue)))
 338                 return -ENOMEM;
 339
 340         free(*s);
 341         *s = n;
 342
 343         return 0;
 344 }
 345
 346 int config_parse_strv(
 347                 const char *filename,
 348                 unsigned line,
 349                 const char *section,
 350                 const char *lvalue,
 351                 const char *rvalue,
 352                 void *data,
 353                 void *userdata) {
 354
 355         char*** sv = data;
 356         char **n;
 357         char *w;
 358         unsigned k;
 359         size_t l;
 360         char *state;
 361
 362         assert(filename);
 363         assert(lvalue);
 364         assert(rvalue);
 365         assert(data);
 366
 367         k = strv_length(*sv);
 368         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 369                 k++;
 370
 371         if (!(n = new(char*, k+1)))
 372                 return -ENOMEM;
 373
 374         if (*sv)
 375                 for (k = 0; (*sv)[k]; k++)
 376                         n[k] = (*sv)[k];
 377         else
 378                 k = 0;
 379
 380         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 381                 if (!(n[k++] = strndup(w, l)))
 382                         goto fail;
 383
 384         n[k] = NULL;
 385         free(*sv);
 386         *sv = n;
 387
 388         return 0;
 389
 390 fail:
 391         for (; k > 0; k--)
 392                 free(n[k-1]);
 393         free(n);
 394
 395         return -ENOMEM;
 396 }
 397
 398 int config_parse_path_strv(
 399                 const char *filename,
 400                 unsigned line,
 401                 const char *section,
 402                 const char *lvalue,
 403                 const char *rvalue,
 404                 void *data,
 405                 void *userdata) {
 406
 407         char*** sv = data;
 408         char **n;
 409         char *w;
 410         unsigned k;
 411         size_t l;
 412         char *state;
 413         int r;
 414
 415         assert(filename);
 416         assert(lvalue);
 417         assert(rvalue);
 418         assert(data);
 419
 420         k = strv_length(*sv);
 421         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 422                 k++;
 423
 424         if (!(n = new(char*, k+1)))
 425                 return -ENOMEM;
 426
 427         k = 0;
 428         if (*sv)
 429                 for (; (*sv)[k]; k++)
 430                         n[k] = (*sv)[k];
 431
 432         FOREACH_WORD_QUOTED(w, l, rvalue, state) {
 433                 if (!(n[k] = strndup(w, l))) {
 434                         r = -ENOMEM;
 435                         goto fail;
 436                 }
 437
 438                 if (!path_is_absolute(n[k])) {
 439                         log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 440                         r = -EINVAL;
 441                         goto fail;
 442                 }
 443
 444                 k++;
 445         }
 446
 447         n[k] = NULL;
 448         free(*sv);
 449         *sv = n;
 450
 451         return 0;
 452
 453 fail:
 454         free(n[k]);
 455         for (; k > 0; k--)
 456                 free(n[k-1]);
 457         free(n);
 458
 459         return r;
 460 }