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         bool ours = false;
 139
 140         assert(filename);
 141         assert(t);
 142
 143         if (!f) {
 144                 if (!(f = fopen(filename, "re"))) {
 145                         r = -errno;
 146                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 147                         goto finish;
 148                 }
 149
 150                 ours = true;
 151         }
 152
 153         while (!feof(f)) {
 154                 char l[LINE_MAX];
 155
 156                 if (!fgets(l, sizeof(l), f)) {
 157                         if (feof(f))
 158                                 break;
 159
 160                         r = -errno;
 161                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 162                         goto finish;
 163                 }
 164
 165                 if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
 166                         goto finish;
 167         }
 168
 169         r = 0;
 170
 171 finish:
 172         free(section);
 173
 174         if (f && ours)
 175                 fclose(f);
 176
 177         return r;
 178 }
 179
 180 int config_parse_int(
 181                 const char *filename,
 182                 unsigned line,
 183                 const char *section,
 184                 const char *lvalue,
 185                 const char *rvalue,
 186                 void *data,
 187                 void *userdata) {
 188
 189         int *i = data;
 190         int r;
 191
 192         assert(filename);
 193         assert(lvalue);
 194         assert(rvalue);
 195         assert(data);
 196
 197         if ((r = safe_atoi(rvalue, i)) < 0) {
 198                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 199                 return r;
 200         }
 201
 202         return 0;
 203 }
 204
 205 int config_parse_unsigned(
 206                 const char *filename,
 207                 unsigned line,
 208                 const char *section,
 209                 const char *lvalue,
 210                 const char *rvalue,
 211                 void *data,
 212                 void *userdata) {
 213
 214         unsigned *u = data;
 215         int r;
 216
 217         assert(filename);
 218         assert(lvalue);
 219         assert(rvalue);
 220         assert(data);
 221
 222         if ((r = safe_atou(rvalue, u)) < 0) {
 223                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 224                 return r;
 225         }
 226
 227         return 0;
 228 }
 229
 230 int config_parse_size(
 231                 const char *filename,
 232                 unsigned line,
 233                 const char *section,
 234                 const char *lvalue,
 235                 const char *rvalue,
 236                 void *data,
 237                 void *userdata) {
 238
 239         size_t *sz = data;
 240         unsigned u;
 241         int r;
 242
 243         assert(filename);
 244         assert(lvalue);
 245         assert(rvalue);
 246         assert(data);
 247
 248         if ((r = safe_atou(rvalue, &u)) < 0) {
 249                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 250                 return r;
 251         }
 252
 253         *sz = (size_t) u;
 254         return 0;
 255 }
 256
 257 int config_parse_bool(
 258                 const char *filename,
 259                 unsigned line,
 260                 const char *section,
 261                 const char *lvalue,
 262                 const char *rvalue,
 263                 void *data,
 264                 void *userdata) {
 265
 266         int k;
 267         bool *b = data;
 268
 269         assert(filename);
 270         assert(lvalue);
 271         assert(rvalue);
 272         assert(data);
 273
 274         if ((k = parse_boolean(rvalue)) < 0) {
 275                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 276                 return k;
 277         }
 278
 279         *b = !!k;
 280         return 0;
 281 }
 282
 283 int config_parse_string(
 284                 const char *filename,
 285                 unsigned line,
 286                 const char *section,
 287                 const char *lvalue,
 288                 const char *rvalue,
 289                 void *data,
 290                 void *userdata) {
 291
 292         char **s = data;
 293         char *n;
 294
 295         assert(filename);
 296         assert(lvalue);
 297         assert(rvalue);
 298         assert(data);
 299
 300         if (*rvalue) {
 301                 if (!(n = strdup(rvalue)))
 302                         return -ENOMEM;
 303         } else
 304                 n = NULL;
 305
 306         free(*s);
 307         *s = n;
 308
 309         return 0;
 310 }
 311
 312 int config_parse_path(
 313                 const char *filename,
 314                 unsigned line,
 315                 const char *section,
 316                 const char *lvalue,
 317                 const char *rvalue,
 318                 void *data,
 319                 void *userdata) {
 320
 321         char **s = data;
 322         char *n;
 323
 324         assert(filename);
 325         assert(lvalue);
 326         assert(rvalue);
 327         assert(data);
 328
 329         if (*rvalue != '/') {
 330                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 331                 return -EINVAL;
 332         }
 333
 334         if (!(n = strdup(rvalue)))
 335                 return -ENOMEM;
 336
 337         free(*s);
 338         *s = n;
 339
 340         return 0;
 341 }
 342
 343 int config_parse_strv(
 344                 const char *filename,
 345                 unsigned line,
 346                 const char *section,
 347                 const char *lvalue,
 348                 const char *rvalue,
 349                 void *data,
 350                 void *userdata) {
 351
 352         char*** sv = data;
 353         char **n;
 354         char *w;
 355         unsigned k;
 356         size_t l;
 357         char *state;
 358
 359         assert(filename);
 360         assert(lvalue);
 361         assert(rvalue);
 362         assert(data);
 363
 364         k = strv_length(*sv);
 365         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 366                 k++;
 367
 368         if (!(n = new(char*, k+1)))
 369                 return -ENOMEM;
 370
 371         if (*sv)
 372                 for (k = 0; (*sv)[k]; k++)
 373                         n[k] = (*sv)[k];
 374
 375         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 376                 if (!(n[k++] = strndup(w, l)))
 377                         goto fail;
 378
 379         n[k] = NULL;
 380         free(*sv);
 381         *sv = n;
 382
 383         return 0;
 384
 385 fail:
 386         for (; k > 0; k--)
 387                 free(n[k-1]);
 388         free(n);
 389
 390         return -ENOMEM;
 391 }