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     else if (type == TYPE_FONT)
 129         fontspec_free(val->u.fontval);
 130 }
 131
 132 /*
 133  * Copy a 'struct value' into another one, copying its dynamic data
 134  * if necessary.
 135  */
 136 static void copy_value(struct value *to, struct value *from, int type)
 137 {
 138     switch (type) {
 139       case TYPE_INT:
 140         to->u.intval = from->u.intval;
 141         break;
 142       case TYPE_STR:
 143         to->u.stringval = dupstr(from->u.stringval);
 144         break;
 145       case TYPE_FILENAME:
 146         to->u.fileval = from->u.fileval;
 147         break;
 148       case TYPE_FONT:
 149         to->u.fontval = fontspec_copy(from->u.fontval);
 150         break;
 151     }
 152 }
 153
 154 /*
 155  * Free an entire 'struct conf_entry' and its dynamic data.
 156  */
 157 static void free_entry(struct conf_entry *entry)
 158 {
 159     free_key(&entry->key);
 160     free_value(&entry->value, valuetypes[entry->key.primary]);
 161     sfree(entry);
 162 }
 163
 164 Conf *conf_new(void)
 165 {
 166     Conf *conf = snew(struct conf_tag);
 167
 168     conf->tree = newtree234(conf_cmp);
 169
 170     return conf;
 171 }
 172
 173 static void conf_clear(Conf *conf)
 174 {
 175     struct conf_entry *entry;
 176
 177     while ((entry = delpos234(conf->tree, 0)) != NULL)
 178         free_entry(entry);
 179 }
 180
 181 void conf_free(Conf *conf)
 182 {
 183     conf_clear(conf);
 184     freetree234(conf->tree);
 185     sfree(conf);
 186 }
 187
 188 static void conf_insert(Conf *conf, struct conf_entry *entry)
 189 {
 190     struct conf_entry *oldentry = add234(conf->tree, entry);
 191     if (oldentry && oldentry != entry) {
 192         del234(conf->tree, oldentry);
 193         free_entry(oldentry);
 194         oldentry = add234(conf->tree, entry);
 195         assert(oldentry == entry);
 196     }
 197 }
 198
 199 void conf_copy_into(Conf *newconf, Conf *oldconf)
 200 {
 201     struct conf_entry *entry, *entry2;
 202     int i;
 203
 204     conf_clear(newconf);
 205
 206     for (i = 0; (entry = index234(oldconf->tree, i)) != NULL; i++) {
 207         entry2 = snew(struct conf_entry);
 208         copy_key(&entry2->key, &entry->key);
 209         copy_value(&entry2->value, &entry->value,
 210                    valuetypes[entry->key.primary]);
 211         add234(newconf->tree, entry2);
 212     }
 213 }
 214
 215 Conf *conf_copy(Conf *oldconf)
 216 {
 217     Conf *newconf = conf_new();
 218
 219     conf_copy_into(newconf, oldconf);
 220
 221     return newconf;
 222 }
 223
 224 int conf_get_int(Conf *conf, int primary)
 225 {
 226     struct key key;
 227     struct conf_entry *entry;
 228
 229     assert(subkeytypes[primary] == TYPE_NONE);
 230     assert(valuetypes[primary] == TYPE_INT);
 231     key.primary = primary;
 232     entry = find234(conf->tree, &key, NULL);
 233     assert(entry);
 234     return entry->value.u.intval;
 235 }
 236
 237 int conf_get_int_int(Conf *conf, int primary, int secondary)
 238 {
 239     struct key key;
 240     struct conf_entry *entry;
 241
 242     assert(subkeytypes[primary] == TYPE_INT);
 243     assert(valuetypes[primary] == TYPE_INT);
 244     key.primary = primary;
 245     key.secondary.i = secondary;
 246     entry = find234(conf->tree, &key, NULL);
 247     assert(entry);
 248     return entry->value.u.intval;
 249 }
 250
 251 char *conf_get_str(Conf *conf, int primary)
 252 {
 253     struct key key;
 254     struct conf_entry *entry;
 255
 256     assert(subkeytypes[primary] == TYPE_NONE);
 257     assert(valuetypes[primary] == TYPE_STR);
 258     key.primary = primary;
 259     entry = find234(conf->tree, &key, NULL);
 260     assert(entry);
 261     return entry->value.u.stringval;
 262 }
 263
 264 char *conf_get_str_str_opt(Conf *conf, int primary, const char *secondary)
 265 {
 266     struct key key;
 267     struct conf_entry *entry;
 268
 269     assert(subkeytypes[primary] == TYPE_STR);
 270     assert(valuetypes[primary] == TYPE_STR);
 271     key.primary = primary;
 272     key.secondary.s = (char *)secondary;
 273     entry = find234(conf->tree, &key, NULL);
 274     return entry ? entry->value.u.stringval : NULL;
 275 }
 276
 277 char *conf_get_str_str(Conf *conf, int primary, const char *secondary)
 278 {
 279     char *ret = conf_get_str_str_opt(conf, primary, secondary);
 280     assert(ret);
 281     return ret;
 282 }
 283
 284 char *conf_get_str_strs(Conf *conf, int primary,
 285                        char *subkeyin, char **subkeyout)
 286 {
 287     struct key key;
 288     struct conf_entry *entry;
 289
 290     assert(subkeytypes[primary] == TYPE_STR);
 291     assert(valuetypes[primary] == TYPE_STR);
 292     key.primary = primary;
 293     if (subkeyin) {
 294         key.secondary.s = subkeyin;
 295         entry = findrel234(conf->tree, &key, NULL, REL234_GT);
 296     } else {
 297         key.secondary.s = "";
 298         entry = findrel234(conf->tree, &key, NULL, REL234_GE);
 299     }
 300     if (!entry || entry->key.primary != primary)
 301         return NULL;
 302     *subkeyout = entry->key.secondary.s;
 303     return entry->value.u.stringval;
 304 }
 305
 306 char *conf_get_str_nthstrkey(Conf *conf, int primary, int n)
 307 {
 308     struct key key;
 309     struct conf_entry *entry;
 310     int index;
 311
 312     assert(subkeytypes[primary] == TYPE_STR);
 313     assert(valuetypes[primary] == TYPE_STR);
 314     key.primary = primary;
 315     key.secondary.s = "";
 316     entry = findrelpos234(conf->tree, &key, NULL, REL234_GE, &index);
 317     if (!entry || entry->key.primary != primary)
 318         return NULL;
 319     entry = index234(conf->tree, index + n);
 320     if (!entry || entry->key.primary != primary)
 321         return NULL;
 322     return entry->key.secondary.s;
 323 }
 324
 325 Filename *conf_get_filename(Conf *conf, int primary)
 326 {
 327     struct key key;
 328     struct conf_entry *entry;
 329
 330     assert(subkeytypes[primary] == TYPE_NONE);
 331     assert(valuetypes[primary] == TYPE_FILENAME);
 332     key.primary = primary;
 333     entry = find234(conf->tree, &key, NULL);
 334     assert(entry);
 335     return &entry->value.u.fileval;
 336 }
 337
 338 FontSpec *conf_get_fontspec(Conf *conf, int primary)
 339 {
 340     struct key key;
 341     struct conf_entry *entry;
 342
 343     assert(subkeytypes[primary] == TYPE_NONE);
 344     assert(valuetypes[primary] == TYPE_FONT);
 345     key.primary = primary;
 346     entry = find234(conf->tree, &key, NULL);
 347     assert(entry);
 348     return entry->value.u.fontval;
 349 }
 350
 351 void conf_set_int(Conf *conf, int primary, int value)
 352 {
 353     struct conf_entry *entry = snew(struct conf_entry);
 354
 355     assert(subkeytypes[primary] == TYPE_NONE);
 356     assert(valuetypes[primary] == TYPE_INT);
 357     entry->key.primary = primary;
 358     entry->value.u.intval = value;
 359     conf_insert(conf, entry);
 360 }
 361
 362 void conf_set_int_int(Conf *conf, int primary, int secondary, int value)
 363 {
 364     struct conf_entry *entry = snew(struct conf_entry);
 365
 366     assert(subkeytypes[primary] == TYPE_INT);
 367     assert(valuetypes[primary] == TYPE_INT);
 368     entry->key.primary = primary;
 369     entry->key.secondary.i = secondary;
 370     entry->value.u.intval = value;
 371     conf_insert(conf, entry);
 372 }
 373
 374 void conf_set_str(Conf *conf, int primary, const char *value)
 375 {
 376     struct conf_entry *entry = snew(struct conf_entry);
 377
 378     assert(subkeytypes[primary] == TYPE_NONE);
 379     assert(valuetypes[primary] == TYPE_STR);
 380     entry->key.primary = primary;
 381     entry->value.u.stringval = dupstr(value);
 382     conf_insert(conf, entry);
 383 }
 384
 385 void conf_set_str_str(Conf *conf, int primary, const char *secondary,
 386                       const char *value)
 387 {
 388     struct conf_entry *entry = snew(struct conf_entry);
 389
 390     assert(subkeytypes[primary] == TYPE_STR);
 391     assert(valuetypes[primary] == TYPE_STR);
 392     entry->key.primary = primary;
 393     entry->key.secondary.s = dupstr(secondary);
 394     entry->value.u.stringval = dupstr(value);
 395     conf_insert(conf, entry);
 396 }
 397
 398 void conf_del_str_str(Conf *conf, int primary, const char *secondary)
 399 {
 400     struct key key;
 401     struct conf_entry *entry;
 402
 403     assert(subkeytypes[primary] == TYPE_STR);
 404     assert(valuetypes[primary] == TYPE_STR);
 405     key.primary = primary;
 406     key.secondary.s = (char *)secondary;
 407     entry = find234(conf->tree, &key, NULL);
 408     if (entry) {
 409         del234(conf->tree, entry);
 410         free_entry(entry);
 411     }
 412  }
 413
 414 void conf_set_filename(Conf *conf, int primary, const Filename *value)
 415 {
 416     struct conf_entry *entry = snew(struct conf_entry);
 417
 418     assert(subkeytypes[primary] == TYPE_NONE);
 419     assert(valuetypes[primary] == TYPE_FILENAME);
 420     entry->key.primary = primary;
 421     entry->value.u.fileval = *value;   /* structure copy */
 422     conf_insert(conf, entry);
 423 }
 424
 425 void conf_set_fontspec(Conf *conf, int primary, const FontSpec *value)
 426 {
 427     struct conf_entry *entry = snew(struct conf_entry);
 428
 429     assert(subkeytypes[primary] == TYPE_NONE);
 430     assert(valuetypes[primary] == TYPE_FONT);
 431     entry->key.primary = primary;
 432     entry->value.u.fontval = fontspec_copy(value);
 433     conf_insert(conf, entry);
 434 }
 435
 436 int conf_serialised_size(Conf *conf)
 437 {
 438     int i;
 439     struct conf_entry *entry;
 440     int size = 0;
 441
 442     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 443         size += 4;   /* primary key */
 444         switch (subkeytypes[entry->key.primary]) {
 445           case TYPE_INT:
 446             size += 4;
 447             break;
 448           case TYPE_STR:
 449             size += 1 + strlen(entry->key.secondary.s);
 450             break;
 451         }
 452         switch (valuetypes[entry->key.primary]) {
 453           case TYPE_INT:
 454             size += 4;
 455             break;
 456           case TYPE_STR:
 457             size += 1 + strlen(entry->value.u.stringval);
 458             break;
 459           case TYPE_FILENAME:
 460             size += sizeof(entry->value.u.fileval);
 461             break;
 462           case TYPE_FONT:
 463             size += fontspec_serialise(entry->value.u.fontval, NULL);
 464             break;
 465         }
 466     }
 467
 468     size += 4;                         /* terminator value */
 469
 470     return size;
 471 }
 472
 473 void conf_serialise(Conf *conf, void *vdata)
 474 {
 475     unsigned char *data = (unsigned char *)vdata;
 476     int i, len;
 477     struct conf_entry *entry;
 478
 479     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 480         PUT_32BIT_MSB_FIRST(data, entry->key.primary);
 481         data += 4;
 482
 483         switch (subkeytypes[entry->key.primary]) {
 484           case TYPE_INT:
 485             PUT_32BIT_MSB_FIRST(data, entry->key.secondary.i);
 486             data += 4;
 487             break;
 488           case TYPE_STR:
 489             len = strlen(entry->key.secondary.s);
 490             memcpy(data, entry->key.secondary.s, len);
 491             data += len;
 492             *data++ = 0;
 493             break;
 494         }
 495         switch (valuetypes[entry->key.primary]) {
 496           case TYPE_INT:
 497             PUT_32BIT_MSB_FIRST(data, entry->value.u.intval);
 498             data += 4;
 499             break;
 500           case TYPE_STR:
 501             len = strlen(entry->value.u.stringval);
 502             memcpy(data, entry->value.u.stringval, len);
 503             data += len;
 504             *data++ = 0;
 505             break;
 506           case TYPE_FILENAME:
 507             memcpy(data, &entry->value.u.fileval,
 508                    sizeof(entry->value.u.fileval));
 509             data += sizeof(entry->value.u.fileval);
 510             break;
 511           case TYPE_FONT:
 512             data += fontspec_serialise(entry->value.u.fontval, data);
 513             break;
 514         }
 515     }
 516
 517     PUT_32BIT_MSB_FIRST(data, 0xFFFFFFFFU);
 518 }
 519
 520 int conf_deserialise(Conf *conf, void *vdata, int maxsize)
 521 {
 522     unsigned char *data = (unsigned char *)vdata;
 523     unsigned char *start = data;
 524     struct conf_entry *entry;
 525     int primary, used;
 526     unsigned char *zero;
 527
 528     while (maxsize >= 4) {
 529         primary = GET_32BIT_MSB_FIRST(data);
 530         data += 4, maxsize -= 4;
 531
 532         if ((unsigned)primary >= N_CONFIG_OPTIONS)
 533             break;
 534
 535         entry = snew(struct conf_entry);
 536         entry->key.primary = primary;
 537
 538         switch (subkeytypes[entry->key.primary]) {
 539           case TYPE_INT:
 540             if (maxsize < 4) {
 541                 sfree(entry);
 542                 goto done;
 543             }
 544             entry->key.secondary.i = GET_32BIT_MSB_FIRST(data);
 545             data += 4, maxsize -= 4;
 546             break;
 547           case TYPE_STR:
 548             zero = memchr(data, 0, maxsize);
 549             if (!zero) {
 550                 sfree(entry);
 551                 goto done;
 552             }
 553             entry->key.secondary.s = dupstr((char *)data);
 554             maxsize -= (zero + 1 - data);
 555             data = zero + 1;
 556             break;
 557         }
 558
 559         switch (valuetypes[entry->key.primary]) {
 560           case TYPE_INT:
 561             if (maxsize < 4) {
 562                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 563                     sfree(entry->key.secondary.s);
 564                 sfree(entry);
 565                 goto done;
 566             }
 567             entry->value.u.intval = GET_32BIT_MSB_FIRST(data);
 568             data += 4, maxsize -= 4;
 569             break;
 570           case TYPE_STR:
 571             zero = memchr(data, 0, maxsize);
 572             if (!zero) {
 573                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 574                     sfree(entry->key.secondary.s);
 575                 sfree(entry);
 576                 goto done;
 577             }
 578             entry->value.u.stringval = dupstr((char *)data);
 579             maxsize -= (zero + 1 - data);
 580             data = zero + 1;
 581             break;
 582           case TYPE_FILENAME:
 583             if (maxsize < sizeof(entry->value.u.fileval)) {
 584                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 585                     sfree(entry->key.secondary.s);
 586                 sfree(entry);
 587                 goto done;
 588             }
 589             memcpy(&entry->value.u.fileval, data,
 590                    sizeof(entry->value.u.fileval));
 591             data += sizeof(entry->value.u.fileval);
 592             maxsize -= sizeof(entry->value.u.fileval);
 593             break;
 594           case TYPE_FONT:
 595             entry->value.u.fontval =
 596                 fontspec_deserialise(data, maxsize, &used);
 597             if (!entry->value.u.fontval) {
 598                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 599                     sfree(entry->key.secondary.s);
 600                 sfree(entry);
 601                 goto done;
 602             }
 603             data += used;
 604             maxsize -= used;
 605             break;
 606         }
 607         conf_insert(conf, entry);
 608     }
 609
 610     done:
 611     return (int)(data - start);
 612 }