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