git.distorted.org.uk Git - u/mdw/putty/blob - conf.c

   1 /*
   2  * conf.c: implementation of the internal storage format used for
   3  * the configuration of a PuTTY session.
   4  */
   5
   6 #include <stdio.h>
   7 #include <stddef.h>
   8 #include <assert.h>
   9
  10 #include "tree234.h"
  11 #include "putty.h"
  12
  13 /*
  14  * Enumeration of types used in keys and values.
  15  */
  16 typedef enum { TYPE_NONE, TYPE_INT, TYPE_STR, TYPE_FILENAME, TYPE_FONT } Type;
  17
  18 /*
  19  * Arrays which allow us to look up the subkey and value types for a
  20  * given primary key id.
  21  */
  22 #define CONF_SUBKEYTYPE_DEF(valtype, keytype, keyword) TYPE_ ## keytype,
  23 static int subkeytypes[] = { CONFIG_OPTIONS(CONF_SUBKEYTYPE_DEF) };
  24 #define CONF_VALUETYPE_DEF(valtype, keytype, keyword) TYPE_ ## valtype,
  25 static int valuetypes[] = { CONFIG_OPTIONS(CONF_VALUETYPE_DEF) };
  26
  27 /*
  28  * Configuration keys are primarily integers (big enum of all the
  29  * different configurable options); some keys have string-designated
  30  * subkeys, such as the list of environment variables (subkeys
  31  * defined by the variable names); some have integer-designated
  32  * subkeys (wordness, colours, preference lists).
  33  */
  34 struct key {
  35     int primary;
  36     union {
  37         int i;
  38         char *s;
  39     } secondary;
  40 };
  41
  42 struct value {
  43     union {
  44         int intval;
  45         char *stringval;
  46         Filename fileval;
  47         FontSpec fontval;
  48     } u;
  49 };
  50
  51 struct conf_entry {
  52     struct key key;
  53     struct value value;
  54 };
  55
  56 struct conf_tag {
  57     tree234 *tree;
  58 };
  59
  60 /*
  61  * Because 'struct key' is the first element in 'struct conf_entry',
  62  * it's safe (guaranteed by the C standard) to cast arbitrarily back
  63  * and forth between the two types. Therefore, we only need one
  64  * comparison function, which can double as a main sort function for
  65  * the tree (comparing two conf_entry structures with each other)
  66  * and a search function (looking up an externally supplied key).
  67  */
  68 static int conf_cmp(void *av, void *bv)
  69 {
  70     struct key *a = (struct key *)av;
  71     struct key *b = (struct key *)bv;
  72
  73     if (a->primary < b->primary)
  74         return -1;
  75     else if (a->primary > b->primary)
  76         return +1;
  77     switch (subkeytypes[a->primary]) {
  78       case TYPE_INT:
  79         if (a->secondary.i < b->secondary.i)
  80             return -1;
  81         else if (a->secondary.i > b->secondary.i)
  82             return +1;
  83         return 0;
  84       case TYPE_STR:
  85         return strcmp(a->secondary.s, b->secondary.s);
  86       default:
  87         return 0;
  88     }
  89 }
  90
  91 /*
  92  * Free any dynamic data items pointed to by a 'struct key'. We
  93  * don't free the structure itself, since it's probably part of a
  94  * larger allocated block.
  95  */
  96 static void free_key(struct key *key)
  97 {
  98     if (subkeytypes[key->primary] == TYPE_STR)
  99         sfree(key->secondary.s);
 100 }
 101
 102 /*
 103  * Copy a 'struct key' into another one, copying its dynamic data
 104  * if necessary.
 105  */
 106 static void copy_key(struct key *to, struct key *from)
 107 {
 108     to->primary = from->primary;
 109     switch (subkeytypes[to->primary]) {
 110       case TYPE_INT:
 111         to->secondary.i = from->secondary.i;
 112         break;
 113       case TYPE_STR:
 114         to->secondary.s = dupstr(from->secondary.s);
 115         break;
 116     }
 117 }
 118
 119 /*
 120  * Free any dynamic data items pointed to by a 'struct value'. We
 121  * don't free the value itself, since it's probably part of a larger
 122  * allocated block.
 123  */
 124 static void free_value(struct value *val, int type)
 125 {
 126     if (type == TYPE_STR)
 127         sfree(val->u.stringval);
 128 }
 129
 130 /*
 131  * Copy a 'struct value' into another one, copying its dynamic data
 132  * if necessary.
 133  */
 134 static void copy_value(struct value *to, struct value *from, int type)
 135 {
 136     switch (type) {
 137       case TYPE_INT:
 138         to->u.intval = from->u.intval;
 139         break;
 140       case TYPE_STR:
 141         to->u.stringval = dupstr(from->u.stringval);
 142         break;
 143       case TYPE_FILENAME:
 144         to->u.fileval = from->u.fileval;
 145         break;
 146       case TYPE_FONT:
 147         to->u.fontval = from->u.fontval;
 148         break;
 149     }
 150 }
 151
 152 /*
 153  * Free an entire 'struct conf_entry' and its dynamic data.
 154  */
 155 static void free_entry(struct conf_entry *entry)
 156 {
 157     free_key(&entry->key);
 158     free_value(&entry->value, valuetypes[entry->key.primary]);
 159     sfree(entry);
 160 }
 161
 162 Conf *conf_new(void)
 163 {
 164     Conf *conf = snew(struct conf_tag);
 165
 166     conf->tree = newtree234(conf_cmp);
 167
 168     return conf;
 169 }
 170
 171 static void conf_clear(Conf *conf)
 172 {
 173     struct conf_entry *entry;
 174
 175     while ((entry = delpos234(conf->tree, 0)) != NULL)
 176         free_entry(entry);
 177 }
 178
 179 void conf_free(Conf *conf)
 180 {
 181     conf_clear(conf);
 182     freetree234(conf->tree);
 183     sfree(conf);
 184 }
 185
 186 static void conf_insert(Conf *conf, struct conf_entry *entry)
 187 {
 188     struct conf_entry *oldentry = add234(conf->tree, entry);
 189     if (oldentry && oldentry != entry) {
 190         del234(conf->tree, oldentry);
 191         free_entry(oldentry);
 192         oldentry = add234(conf->tree, entry);
 193         assert(oldentry == entry);
 194     }
 195 }
 196
 197 void conf_copy_into(Conf *newconf, Conf *oldconf)
 198 {
 199     struct conf_entry *entry, *entry2;
 200     int i;
 201
 202     for (i = 0; (entry = index234(oldconf->tree, i)) != NULL; i++) {
 203         entry2 = snew(struct conf_entry);
 204         copy_key(&entry2->key, &entry->key);
 205         copy_value(&entry2->value, &entry->value,
 206                    valuetypes[entry->key.primary]);
 207         add234(newconf->tree, entry2);
 208     }
 209 }
 210
 211 Conf *conf_copy(Conf *oldconf)
 212 {
 213     Conf *newconf = conf_new();
 214
 215     conf_copy_into(newconf, oldconf);
 216
 217     return newconf;
 218 }
 219
 220 int conf_get_int(Conf *conf, int primary)
 221 {
 222     struct key key;
 223     struct conf_entry *entry;
 224
 225     assert(subkeytypes[primary] == TYPE_NONE);
 226     assert(valuetypes[primary] == TYPE_INT);
 227     key.primary = primary;
 228     entry = find234(conf->tree, &key, NULL);
 229     assert(entry);
 230     return entry->value.u.intval;
 231 }
 232
 233 int conf_get_int_int(Conf *conf, int primary, int secondary)
 234 {
 235     struct key key;
 236     struct conf_entry *entry;
 237
 238     assert(subkeytypes[primary] == TYPE_INT);
 239     assert(valuetypes[primary] == TYPE_INT);
 240     key.primary = primary;
 241     key.secondary.i = secondary;
 242     entry = find234(conf->tree, &key, NULL);
 243     assert(entry);
 244     return entry->value.u.intval;
 245 }
 246
 247 char *conf_get_str(Conf *conf, int primary)
 248 {
 249     struct key key;
 250     struct conf_entry *entry;
 251
 252     assert(subkeytypes[primary] == TYPE_NONE);
 253     assert(valuetypes[primary] == TYPE_STR);
 254     key.primary = primary;
 255     entry = find234(conf->tree, &key, NULL);
 256     assert(entry);
 257     return entry->value.u.stringval;
 258 }
 259
 260 char *conf_get_str_str_opt(Conf *conf, int primary, const char *secondary)
 261 {
 262     struct key key;
 263     struct conf_entry *entry;
 264
 265     assert(subkeytypes[primary] == TYPE_STR);
 266     assert(valuetypes[primary] == TYPE_STR);
 267     key.primary = primary;
 268     key.secondary.s = (char *)secondary;
 269     entry = find234(conf->tree, &key, NULL);
 270     return entry ? entry->value.u.stringval : NULL;
 271 }
 272
 273 char *conf_get_str_str(Conf *conf, int primary, const char *secondary)
 274 {
 275     char *ret = conf_get_str_str_opt(conf, primary, secondary);
 276     assert(ret);
 277     return ret;
 278 }
 279
 280 char *conf_get_str_strs(Conf *conf, int primary,
 281                        char *subkeyin, char **subkeyout)
 282 {
 283     struct key key;
 284     struct conf_entry *entry;
 285
 286     assert(subkeytypes[primary] == TYPE_STR);
 287     assert(valuetypes[primary] == TYPE_STR);
 288     key.primary = primary;
 289     if (subkeyin) {
 290         key.secondary.s = subkeyin;
 291         entry = findrel234(conf->tree, &key, NULL, REL234_GT);
 292     } else {
 293         key.secondary.s = "";
 294         entry = findrel234(conf->tree, &key, NULL, REL234_GE);
 295     }
 296     if (!entry || entry->key.primary != primary)
 297         return NULL;
 298     *subkeyout = entry->key.secondary.s;
 299     return entry->value.u.stringval;
 300 }
 301
 302 char *conf_get_str_nthstrkey(Conf *conf, int primary, int n)
 303 {
 304     struct key key;
 305     struct conf_entry *entry;
 306     int index;
 307
 308     assert(subkeytypes[primary] == TYPE_STR);
 309     assert(valuetypes[primary] == TYPE_STR);
 310     key.primary = primary;
 311     key.secondary.s = "";
 312     entry = findrelpos234(conf->tree, &key, NULL, REL234_GE, &index);
 313     if (!entry || entry->key.primary != primary)
 314         return NULL;
 315     entry = index234(conf->tree, index + n);
 316     if (!entry || entry->key.primary != primary)
 317         return NULL;
 318     return entry->key.secondary.s;
 319 }
 320
 321 Filename *conf_get_filename(Conf *conf, int primary)
 322 {
 323     struct key key;
 324     struct conf_entry *entry;
 325
 326     assert(subkeytypes[primary] == TYPE_NONE);
 327     assert(valuetypes[primary] == TYPE_FILENAME);
 328     key.primary = primary;
 329     entry = find234(conf->tree, &key, NULL);
 330     assert(entry);
 331     return &entry->value.u.fileval;
 332 }
 333
 334 FontSpec *conf_get_fontspec(Conf *conf, int primary)
 335 {
 336     struct key key;
 337     struct conf_entry *entry;
 338
 339     assert(subkeytypes[primary] == TYPE_NONE);
 340     assert(valuetypes[primary] == TYPE_FONT);
 341     key.primary = primary;
 342     entry = find234(conf->tree, &key, NULL);
 343     assert(entry);
 344     return &entry->value.u.fontval;
 345 }
 346
 347 void conf_set_int(Conf *conf, int primary, int value)
 348 {
 349     struct conf_entry *entry = snew(struct conf_entry);
 350
 351     assert(subkeytypes[primary] == TYPE_NONE);
 352     assert(valuetypes[primary] == TYPE_INT);
 353     entry->key.primary = primary;
 354     entry->value.u.intval = value;
 355     conf_insert(conf, entry);
 356 }
 357
 358 void conf_set_int_int(Conf *conf, int primary, int secondary, int value)
 359 {
 360     struct conf_entry *entry = snew(struct conf_entry);
 361
 362     assert(subkeytypes[primary] == TYPE_INT);
 363     assert(valuetypes[primary] == TYPE_INT);
 364     entry->key.primary = primary;
 365     entry->key.secondary.i = secondary;
 366     entry->value.u.intval = value;
 367     conf_insert(conf, entry);
 368 }
 369
 370 void conf_set_str(Conf *conf, int primary, const char *value)
 371 {
 372     struct conf_entry *entry = snew(struct conf_entry);
 373
 374     assert(subkeytypes[primary] == TYPE_NONE);
 375     assert(valuetypes[primary] == TYPE_STR);
 376     entry->key.primary = primary;
 377     entry->value.u.stringval = dupstr(value);
 378     conf_insert(conf, entry);
 379 }
 380
 381 void conf_set_str_str(Conf *conf, int primary, const char *secondary,
 382                       const char *value)
 383 {
 384     struct conf_entry *entry = snew(struct conf_entry);
 385
 386     assert(subkeytypes[primary] == TYPE_STR);
 387     assert(valuetypes[primary] == TYPE_STR);
 388     entry->key.primary = primary;
 389     entry->key.secondary.s = dupstr(secondary);
 390     entry->value.u.stringval = dupstr(value);
 391     conf_insert(conf, entry);
 392 }
 393
 394 void conf_del_str_str(Conf *conf, int primary, const char *secondary)
 395 {
 396     struct key key;
 397     struct conf_entry *entry;
 398
 399     assert(subkeytypes[primary] == TYPE_STR);
 400     assert(valuetypes[primary] == TYPE_STR);
 401     key.primary = primary;
 402     key.secondary.s = (char *)secondary;
 403     entry = find234(conf->tree, &key, NULL);
 404     if (entry) {
 405         del234(conf->tree, entry);
 406         free_entry(entry);
 407     }
 408  }
 409
 410 void conf_set_filename(Conf *conf, int primary, const Filename *value)
 411 {
 412     struct conf_entry *entry = snew(struct conf_entry);
 413
 414     assert(subkeytypes[primary] == TYPE_NONE);
 415     assert(valuetypes[primary] == TYPE_FILENAME);
 416     entry->key.primary = primary;
 417     entry->value.u.fileval = *value;   /* structure copy */
 418     conf_insert(conf, entry);
 419 }
 420
 421 void conf_set_fontspec(Conf *conf, int primary, const FontSpec *value)
 422 {
 423     struct conf_entry *entry = snew(struct conf_entry);
 424
 425     assert(subkeytypes[primary] == TYPE_NONE);
 426     assert(valuetypes[primary] == TYPE_FONT);
 427     entry->key.primary = primary;
 428     entry->value.u.fontval = *value;   /* structure copy */
 429     conf_insert(conf, entry);
 430 }
 431
 432 int conf_serialised_size(Conf *conf)
 433 {
 434     int i;
 435     struct conf_entry *entry;
 436     int size = 0;
 437
 438     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 439         size += 4;   /* primary key */
 440         switch (subkeytypes[entry->key.primary]) {
 441           case TYPE_INT:
 442             size += 4;
 443             break;
 444           case TYPE_STR:
 445             size += 1 + strlen(entry->key.secondary.s);
 446             break;
 447         }
 448         switch (valuetypes[entry->key.primary]) {
 449           case TYPE_INT:
 450             size += 4;
 451             break;
 452           case TYPE_STR:
 453             size += 1 + strlen(entry->value.u.stringval);
 454             break;
 455           case TYPE_FILENAME:
 456             size += sizeof(entry->value.u.fileval);
 457             break;
 458           case TYPE_FONT:
 459             size += sizeof(entry->value.u.fontval);
 460             break;
 461         }
 462     }
 463
 464     size += 4;                         /* terminator value */
 465
 466     return size;
 467 }
 468
 469 void conf_serialise(Conf *conf, void *vdata)
 470 {
 471     unsigned char *data = (unsigned char *)vdata;
 472     int i, len;
 473     struct conf_entry *entry;
 474
 475     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 476         PUT_32BIT_MSB_FIRST(data, entry->key.primary);
 477         data += 4;
 478
 479         switch (subkeytypes[entry->key.primary]) {
 480           case TYPE_INT:
 481             PUT_32BIT_MSB_FIRST(data, entry->key.secondary.i);
 482             data += 4;
 483             break;
 484           case TYPE_STR:
 485             len = strlen(entry->key.secondary.s);
 486             memcpy(data, entry->key.secondary.s, len);
 487             data += len;
 488             *data++ = 0;
 489             break;
 490         }
 491         switch (valuetypes[entry->key.primary]) {
 492           case TYPE_INT:
 493             PUT_32BIT_MSB_FIRST(data, entry->value.u.intval);
 494             data += 4;
 495             break;
 496           case TYPE_STR:
 497             len = strlen(entry->value.u.stringval);
 498             memcpy(data, entry->value.u.stringval, len);
 499             data += len;
 500             *data++ = 0;
 501             break;
 502           case TYPE_FILENAME:
 503             memcpy(data, &entry->value.u.fileval,
 504                    sizeof(entry->value.u.fileval));
 505             data += sizeof(entry->value.u.fileval);
 506             break;
 507           case TYPE_FONT:
 508             memcpy(data, &entry->value.u.fontval,
 509                    sizeof(entry->value.u.fontval));
 510             data += sizeof(entry->value.u.fontval);
 511             break;
 512         }
 513     }
 514
 515     PUT_32BIT_MSB_FIRST(data, 0xFFFFFFFFU);
 516 }
 517
 518 int conf_deserialise(Conf *conf, void *vdata, int maxsize)
 519 {
 520     unsigned char *data = (unsigned char *)vdata;
 521     unsigned char *start = data;
 522     struct conf_entry *entry;
 523     int primary;
 524     unsigned char *zero;
 525
 526     while (maxsize >= 4) {
 527         primary = GET_32BIT_MSB_FIRST(data);
 528         data += 4, maxsize -= 4;
 529
 530         if ((unsigned)primary >= N_CONFIG_OPTIONS)
 531             break;
 532
 533         entry = snew(struct conf_entry);
 534         entry->key.primary = primary;
 535
 536         switch (subkeytypes[entry->key.primary]) {
 537           case TYPE_INT:
 538             if (maxsize < 4) {
 539                 sfree(entry);
 540                 goto done;
 541             }
 542             entry->key.secondary.i = GET_32BIT_MSB_FIRST(data);
 543             data += 4, maxsize -= 4;
 544             break;
 545           case TYPE_STR:
 546             zero = memchr(data, 0, maxsize);
 547             if (!zero) {
 548                 sfree(entry);
 549                 goto done;
 550             }
 551             entry->key.secondary.s = dupstr((char *)data);
 552             maxsize -= (zero + 1 - data);
 553             data = zero + 1;
 554             break;
 555         }
 556
 557         switch (valuetypes[entry->key.primary]) {
 558           case TYPE_INT:
 559             if (maxsize < 4) {
 560                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 561                     sfree(entry->key.secondary.s);
 562                 sfree(entry);
 563                 goto done;
 564             }
 565             entry->value.u.intval = GET_32BIT_MSB_FIRST(data);
 566             data += 4, maxsize -= 4;
 567             break;
 568           case TYPE_STR:
 569             zero = memchr(data, 0, maxsize);
 570             if (!zero) {
 571                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 572                     sfree(entry->key.secondary.s);
 573                 sfree(entry);
 574                 goto done;
 575             }
 576             entry->value.u.stringval = dupstr((char *)data);
 577             maxsize -= (zero + 1 - data);
 578             data = zero + 1;
 579             break;
 580           case TYPE_FILENAME:
 581             if (maxsize < sizeof(entry->value.u.fileval)) {
 582                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 583                     sfree(entry->key.secondary.s);
 584                 sfree(entry);
 585                 goto done;
 586             }
 587             memcpy(&entry->value.u.fileval, data,
 588                    sizeof(entry->value.u.fileval));
 589             data += sizeof(entry->value.u.fileval);
 590             maxsize -= sizeof(entry->value.u.fileval);
 591             break;
 592           case TYPE_FONT:
 593             if (maxsize < sizeof(entry->value.u.fontval)) {
 594                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 595                     sfree(entry->key.secondary.s);
 596                 sfree(entry);
 597                 goto done;
 598             }
 599             memcpy(&entry->value.u.fontval, data,
 600                    sizeof(entry->value.u.fontval));
 601             data += sizeof(entry->value.u.fontval);
 602             maxsize -= sizeof(entry->value.u.fontval);
 603             break;
 604         }
 605         conf_insert(conf, entry);
 606     }
 607
 608     done:
 609     return (int)(data - start);
 610 }