conf-parser.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <string.h>
   4 #include <stdio.h>
   5 #include <errno.h>
   6 #include <assert.h>
   7 #include <stdlib.h>
   8
   9 #include "conf-parser.h"
  10 #include "util.h"
  11 #include "macro.h"
  12 #include "strv.h"
  13 #include "log.h"
  14
  15 #define COMMENTS "#;\n"
  16 #define NEWLINES "\n\r"
  17 #define LINE_MAX 4096
  18
  19 /* Run the user supplied parser for an assignment */
  20 static int next_assignment(
  21                 const char *filename,
  22                 unsigned line,
  23                 const char *section,
  24                 const ConfigItem *t,
  25                 const char *lvalue,
  26                 const char *rvalue,
  27                 void *userdata) {
  28
  29         assert(filename);
  30         assert(t);
  31         assert(lvalue);
  32         assert(rvalue);
  33
  34         for (; t->parse; t++) {
  35
  36                 if (t->lvalue && !streq(lvalue, t->lvalue))
  37                         continue;
  38
  39                 if (t->section && !section)
  40                         continue;
  41
  42                 if (t->section && !streq(section, t->section))
  43                         continue;
  44
  45                 return t->parse(filename, line, section, lvalue, rvalue, t->data, userdata);
  46         }
  47
  48         log_info("[%s:%u] Unknown lvalue '%s' in section '%s'. Ignoring.", filename, line, lvalue, strna(section));
  49         return 0;
  50 }
  51
  52 /* Parse a variable assignment line */
  53 static int parse_line(const char *filename, unsigned line, char **section, const char* const * sections, const ConfigItem *t, char *l, void *userdata) {
  54         char *e;
  55
  56         l = strstrip(l);
  57
  58         if (!*l)
  59                 return 0;
  60
  61         if (strchr(COMMENTS, *l))
  62                 return 0;
  63
  64         if (startswith(l, ".include ")) {
  65                 char *fn;
  66                 int r;
  67
  68                 if (!(fn = file_in_same_dir(filename, strstrip(l+9))))
  69                         return -ENOMEM;
  70
  71                 r = config_parse(fn, NULL, sections, t, userdata);
  72                 free(fn);
  73
  74                 return r;
  75         }
  76
  77         if (*l == '[') {
  78                 size_t k;
  79                 char *n;
  80
  81                 k = strlen(l);
  82                 assert(k > 0);
  83
  84                 if (l[k-1] != ']') {
  85                         log_error("[%s:%u] Invalid section header.", filename, line);
  86                         return -EBADMSG;
  87                 }
  88
  89                 if (!(n = strndup(l+1, k-2)))
  90                         return -ENOMEM;
  91
  92                 if (sections && !strv_contains((char**) sections, n)) {
  93                         free(n);
  94                         return -EBADMSG;
  95                 }
  96
  97                 free(*section);
  98                 *section = n;
  99
 100                 return 0;
 101         }
 102
 103         if (!(e = strchr(l, '='))) {
 104                 log_error("[%s:%u] Missing '='.", filename, line);
 105                 return -EBADMSG;
 106         }
 107
 108         *e = 0;
 109         e++;
 110
 111         return next_assignment(filename, line, *section, t, strstrip(l), strstrip(e), userdata);
 112 }
 113
 114 /* Go through the file and parse each line */
 115 int config_parse(const char *filename, FILE *f, const char* const * sections, const ConfigItem *t, void *userdata) {
 116         unsigned line = 0;
 117         char *section = NULL;
 118         int r;
 119
 120         assert(filename);
 121         assert(t);
 122
 123         if (!f) {
 124                 if (!(f = fopen(filename, "re"))) {
 125                         r = -errno;
 126                         log_error("Failed to open configuration file '%s': %s", filename, strerror(-r));
 127                         goto finish;
 128                 }
 129         }
 130
 131         while (!feof(f)) {
 132                 char l[LINE_MAX];
 133
 134                 if (!fgets(l, sizeof(l), f)) {
 135                         if (feof(f))
 136                                 break;
 137
 138                         r = -errno;
 139                         log_error("Failed to read configuration file '%s': %s", filename, strerror(-r));
 140                         goto finish;
 141                 }
 142
 143                 if ((r = parse_line(filename, ++line, &section, sections, t, l, userdata)) < 0)
 144                         goto finish;
 145         }
 146
 147         r = 0;
 148
 149 finish:
 150         free(section);
 151
 152         if (f)
 153                 fclose(f);
 154
 155         return r;
 156 }
 157
 158 int config_parse_int(
 159                 const char *filename,
 160                 unsigned line,
 161                 const char *section,
 162                 const char *lvalue,
 163                 const char *rvalue,
 164                 void *data,
 165                 void *userdata) {
 166
 167         int *i = data;
 168         int r;
 169
 170         assert(filename);
 171         assert(lvalue);
 172         assert(rvalue);
 173         assert(data);
 174
 175         if ((r = safe_atoi(rvalue, i)) < 0) {
 176                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 177                 return r;
 178         }
 179
 180         return 0;
 181 }
 182
 183 int config_parse_unsigned(
 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         unsigned *u = data;
 193         int r;
 194
 195         assert(filename);
 196         assert(lvalue);
 197         assert(rvalue);
 198         assert(data);
 199
 200         if ((r = safe_atou(rvalue, u)) < 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_size(
 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         size_t *sz = data;
 218         unsigned u;
 219         int r;
 220
 221         assert(filename);
 222         assert(lvalue);
 223         assert(rvalue);
 224         assert(data);
 225
 226         if ((r = safe_atou(rvalue, &u)) < 0) {
 227                 log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
 228                 return r;
 229         }
 230
 231         *sz = (size_t) u;
 232         return 0;
 233 }
 234
 235 int config_parse_bool(
 236                 const char *filename,
 237                 unsigned line,
 238                 const char *section,
 239                 const char *lvalue,
 240                 const char *rvalue,
 241                 void *data,
 242                 void *userdata) {
 243
 244         int k;
 245         bool *b = data;
 246
 247         assert(filename);
 248         assert(lvalue);
 249         assert(rvalue);
 250         assert(data);
 251
 252         if ((k = parse_boolean(rvalue)) < 0) {
 253                 log_error("[%s:%u] Failed to parse boolean value: %s", filename, line, rvalue);
 254                 return k;
 255         }
 256
 257         *b = !!k;
 258         return 0;
 259 }
 260
 261 int config_parse_string(
 262                 const char *filename,
 263                 unsigned line,
 264                 const char *section,
 265                 const char *lvalue,
 266                 const char *rvalue,
 267                 void *data,
 268                 void *userdata) {
 269
 270         char **s = data;
 271         char *n;
 272
 273         assert(filename);
 274         assert(lvalue);
 275         assert(rvalue);
 276         assert(data);
 277
 278         if (*rvalue) {
 279                 if (!(n = strdup(rvalue)))
 280                         return -ENOMEM;
 281         } else
 282                 n = NULL;
 283
 284         free(*s);
 285         *s = n;
 286
 287         return 0;
 288 }
 289
 290 int config_parse_path(
 291                 const char *filename,
 292                 unsigned line,
 293                 const char *section,
 294                 const char *lvalue,
 295                 const char *rvalue,
 296                 void *data,
 297                 void *userdata) {
 298
 299         char **s = data;
 300         char *n;
 301
 302         assert(filename);
 303         assert(lvalue);
 304         assert(rvalue);
 305         assert(data);
 306
 307         if (*rvalue != '/') {
 308                 log_error("[%s:%u] Not an absolute path: %s", filename, line, rvalue);
 309                 return -EINVAL;
 310         }
 311
 312         if (!(n = strdup(rvalue)))
 313                 return -ENOMEM;
 314
 315         free(*s);
 316         *s = n;
 317
 318         return 0;
 319 }
 320
 321 int config_parse_strv(
 322                 const char *filename,
 323                 unsigned line,
 324                 const char *section,
 325                 const char *lvalue,
 326                 const char *rvalue,
 327                 void *data,
 328                 void *userdata) {
 329
 330         char*** sv = data;
 331         char **n;
 332         char *w;
 333         unsigned k;
 334         size_t l;
 335         char *state;
 336
 337         assert(filename);
 338         assert(lvalue);
 339         assert(rvalue);
 340         assert(data);
 341
 342         k = strv_length(*sv);
 343         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 344                 k++;
 345
 346         if (!(n = new(char*, k+1)))
 347                 return -ENOMEM;
 348
 349         for (k = 0; (*sv)[k]; k++)
 350                 n[k] = (*sv)[k];
 351         FOREACH_WORD_QUOTED(w, l, rvalue, state)
 352                 if (!(n[k++] = strndup(w, l)))
 353                         goto fail;
 354
 355         n[k] = NULL;
 356         free(*sv);
 357         *sv = n;
 358
 359         return 0;
 360
 361 fail:
 362         for (; k > 0; k--)
 363                 free(n[k-1]);
 364         free(n);
 365
 366         return -ENOMEM;
 367 }