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         log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
  67         return 0;
  68 }
  69
  70 /* Parse a variable assignment line */
  71 static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, char *l, void *userdata) {
  72         char *e;
  73
  74         l = strstrip(l);
  75
  76         if (!*l)
  77                 return 0;
  78
  79         if (strchr(COMMENTS, *l))
  80                 return 0;
  81
  82         if (startswith(l, ".include ")) {
  83                 char *fn;
  84                 int r;
  85
  86                 if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
  87                         return -ENOMEM;
  88
  89                 r = config_parse(fn, NULL, sections, t, userdata);
  90                 free(fn);
  91
  92                 return r;
  93         }
  94
  95         if (*l == '[') {
  96                 size_t k;
  97                 char *n;
  98
  99                 k = strlen(l);
 100                 assert(k > 0);
 101
 102                 if (l[k-1] != ']') {
 103                         log_error("[%s:%u] Invalid section header.", filename, line);
 104                         return -EBADMSG;
 105                 }
 106
 107                 if (!(n = strndup(l+1, k-2)))
 108                         return -ENOMEM;
 109
 110                 if (sections && !strv_contains((char**) sections, n)) {
 111                         free(n);
 112                         return -EBADMSG;
 113                 }
 114
 115                 free(*section);
 116                 *section = n;
 117
 118                 return 0;
 119         }
 120
 121         if (!(e = strchr(l, '='))) {
 122                 log_error("[%s:%u] Missing '='.", filename, line);
 123                 return -EBADMSG;
 124         }
 125
 126         *e = 0;
 127         e++;
 128
 129         return next_assignment(filename, line, *section, t, strstrip(l), strstrip(e), userdata);
 130 }
 131
 132 /* Go through the file and parse each line */
 133 int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
 134         unsigned line = 0;
 135         char *section = NULL;
 136         int r;
 137         bool ours = false;
 138
 139         assert(filename);
 140         assert(t);
 141
 142         if (!f) {
 143                 if (!(f = fopen(filename, "re"))) {
 144                         r = -errno;
 145                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 146                         goto finish;
 147                 }
 148
 149                 ours = true;
 150         }
 151
 152         while (!feof(f)) {
 153                 char l[LINE_MAX];
 154
 155                 if (!fgets(l, sizeof(l), f)) {
 156                         if (feof(f))
 157                                 break;
 158
 159                         r = -errno;
 160                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 161                         goto finish;
 162                 }
 163
 164                 if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
 165                         goto finish;
 166         }
 167
 168         r = 0;
 169
 170 finish:
 171         free(section);
 172
 173         if (f && ours)
 174                 fclose(f);
 175
 176         return r;
 177 }
 178
 179 int config_parse_int(
 180                 const char *filename,
 181                 unsigned line,
 182                 const char *section,
 183                 const char *lvalue,
 184                 const char *rvalue,
 185                 void *data,
 186                 void *userdata) {
 187
 188         int *i = data;
 189         int r;
 190
 191         assert(filename);
 192         assert(lvalue);
 193         assert(rvalue);
 194         assert(data);
 195
 196         if ((r = safe_atoi(rvalue, i)) < 0) {
 197                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 198                 return r;
 199         }
 200
 201         return 0;
 202 }
 203
 204 int config_parse_unsigned(
 205                 const char *filename,
 206                 unsigned line,
 207                 const char *section,
 208                 const char *lvalue,
 209                 const char *rvalue,
 210                 void *data,
 211                 void *userdata) {
 212
 213         unsigned *u = data;
 214         int r;
 215
 216         assert(filename);
 217         assert(lvalue);
 218         assert(rvalue);
 219         assert(data);
 220
 221         if ((r = safe_atou(rvalue, u)) < 0) {
 222                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 223                 return r;
 224         }
 225
 226         return 0;
 227 }
 228
 229 int config_parse_size(
 230                 const char *filename,
 231                 unsigned line,
 232                 const char *section,
 233                 const char *lvalue,
 234                 const char *rvalue,
 235                 void *data,
 236                 void *userdata) {
 237
 238         size_t *sz = data;
 239         unsigned u;
 240         int r;
 241
 242         assert(filename);
 243         assert(lvalue);
 244         assert(rvalue);
 245         assert(data);
 246
 247         if ((r = safe_atou(rvalue, &u)) < 0) {
 248                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 249                 return r;
 250         }
 251
 252         *sz = (size_t) u;
 253         return 0;
 254 }
 255
 256 int config_parse_bool(
 257                 const char *filename,
 258                 unsigned line,
 259                 const char *section,
 260                 const char *lvalue,
 261                 const char *rvalue,
 262                 void *data,
 263                 void *userdata) {
 264
 265         int k;
 266         bool *b = data;
 267
 268         assert(filename);
 269         assert(lvalue);
 270         assert(rvalue);
 271         assert(data);
 272
 273         if ((k = parse_boolean(rvalue)) < 0) {
 274                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 275                 return k;
 276         }
 277
 278         *b = !!k;
 279         return 0;
 280 }
 281
 282 int config_parse_string(
 283                 const char *filename,
 284                 unsigned line,
 285                 const char *section,
 286                 const char *lvalue,
 287                 const char *rvalue,
 288                 void *data,
 289                 void *userdata) {
 290
 291         char **s = data;
 292         char *n;
 293
 294         assert(filename);
 295         assert(lvalue);
 296         assert(rvalue);
 297         assert(data);
 298
 299         if (*rvalue) {
 300                 if (!(n = strdup(rvalue)))
 301                         return -ENOMEM;
 302         } else
 303                 n = NULL;
 304
 305         free(*s);
 306         *s = n;
 307
 308         return 0;
 309 }
 310
 311 int config_parse_path(
 312                 const char *filename,
 313                 unsigned line,
 314                 const char *section,
 315                 const char *lvalue,
 316                 const char *rvalue,
 317                 void *data,
 318                 void *userdata) {
 319
 320         char **s = data;
 321         char *n;
 322
 323         assert(filename);
 324         assert(lvalue);
 325         assert(rvalue);
 326         assert(data);
 327
 328         if (*rvalue != '/') {
 329                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 330                 return -EINVAL;
 331         }
 332
 333         if (!(n = strdup(rvalue)))
 334                 return -ENOMEM;
 335
 336         free(*s);
 337         *s = n;
 338
 339         return 0;
 340 }
 341
 342 int config_parse_strv(
 343                 const char *filename,
 344                 unsigned line,
 345                 const char *section,
 346                 const char *lvalue,
 347                 const char *rvalue,
 348                 void *data,
 349                 void *userdata) {
 350
 351         char*** sv = data;
 352         char **n;
 353         char *w;
 354         unsigned k;
 355         size_t l;
 356         char *state;
 357
 358         assert(filename);
 359         assert(lvalue);
 360         assert(rvalue);
 361         assert(data);
 362
 363         k = strv_length(*sv);
 364         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 365                 k++;
 366
 367         if (!(n = new(char*, k+1)))
 368                 return -ENOMEM;
 369
 370         if (*sv)
 371                 for (k = 0; (*sv)[k]; k++)
 372                         n[k] = (*sv)[k];
 373         else
 374                 k = 0;
 375
 376         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 377                 if (!(n[k++] = strndup(w, l)))
 378                         goto fail;
 379
 380         n[k] = NULL;
 381         free(*sv);
 382         *sv = n;
 383
 384         return 0;
 385
 386 fail:
 387         for (; k > 0; k--)
 388                 free(n[k-1]);
 389         free(n);
 390
 391         return -ENOMEM;
 392 }