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_FILENAME)
 129         filename_free(val->u.fileval);
 130     else if (type == TYPE_FONT)
 131         fontspec_free(val->u.fontval);
 132 }
 133
 134 /*
 135  * Copy a 'struct value' into another one, copying its dynamic data
 136  * if necessary.
 137  */
 138 static void copy_value(struct value *to, struct value *from, int type)
 139 {
 140     switch (type) {
 141       case TYPE_INT:
 142         to->u.intval = from->u.intval;
 143         break;
 144       case TYPE_STR:
 145         to->u.stringval = dupstr(from->u.stringval);
 146         break;
 147       case TYPE_FILENAME:
 148         to->u.fileval = filename_copy(from->u.fileval);
 149         break;
 150       case TYPE_FONT:
 151         to->u.fontval = fontspec_copy(from->u.fontval);
 152         break;
 153     }
 154 }
 155
 156 /*
 157  * Free an entire 'struct conf_entry' and its dynamic data.
 158  */
 159 static void free_entry(struct conf_entry *entry)
 160 {
 161     free_key(&entry->key);
 162     free_value(&entry->value, valuetypes[entry->key.primary]);
 163     sfree(entry);
 164 }
 165
 166 Conf *conf_new(void)
 167 {
 168     Conf *conf = snew(struct conf_tag);
 169
 170     conf->tree = newtree234(conf_cmp);
 171
 172     return conf;
 173 }
 174
 175 static void conf_clear(Conf *conf)
 176 {
 177     struct conf_entry *entry;
 178
 179     while ((entry = delpos234(conf->tree, 0)) != NULL)
 180         free_entry(entry);
 181 }
 182
 183 void conf_free(Conf *conf)
 184 {
 185     conf_clear(conf);
 186     freetree234(conf->tree);
 187     sfree(conf);
 188 }
 189
 190 static void conf_insert(Conf *conf, struct conf_entry *entry)
 191 {
 192     struct conf_entry *oldentry = add234(conf->tree, entry);
 193     if (oldentry && oldentry != entry) {
 194         del234(conf->tree, oldentry);
 195         free_entry(oldentry);
 196         oldentry = add234(conf->tree, entry);
 197         assert(oldentry == entry);
 198     }
 199 }
 200
 201 void conf_copy_into(Conf *newconf, Conf *oldconf)
 202 {
 203     struct conf_entry *entry, *entry2;
 204     int i;
 205
 206     conf_clear(newconf);
 207
 208     for (i = 0; (entry = index234(oldconf->tree, i)) != NULL; i++) {
 209         entry2 = snew(struct conf_entry);
 210         copy_key(&entry2->key, &entry->key);
 211         copy_value(&entry2->value, &entry->value,
 212                    valuetypes[entry->key.primary]);
 213         add234(newconf->tree, entry2);
 214     }
 215 }
 216
 217 Conf *conf_copy(Conf *oldconf)
 218 {
 219     Conf *newconf = conf_new();
 220
 221     conf_copy_into(newconf, oldconf);
 222
 223     return newconf;
 224 }
 225
 226 int conf_get_int(Conf *conf, int primary)
 227 {
 228     struct key key;
 229     struct conf_entry *entry;
 230
 231     assert(subkeytypes[primary] == TYPE_NONE);
 232     assert(valuetypes[primary] == TYPE_INT);
 233     key.primary = primary;
 234     entry = find234(conf->tree, &key, NULL);
 235     assert(entry);
 236     return entry->value.u.intval;
 237 }
 238
 239 int conf_get_int_int(Conf *conf, int primary, int secondary)
 240 {
 241     struct key key;
 242     struct conf_entry *entry;
 243
 244     assert(subkeytypes[primary] == TYPE_INT);
 245     assert(valuetypes[primary] == TYPE_INT);
 246     key.primary = primary;
 247     key.secondary.i = secondary;
 248     entry = find234(conf->tree, &key, NULL);
 249     assert(entry);
 250     return entry->value.u.intval;
 251 }
 252
 253 char *conf_get_str(Conf *conf, int primary)
 254 {
 255     struct key key;
 256     struct conf_entry *entry;
 257
 258     assert(subkeytypes[primary] == TYPE_NONE);
 259     assert(valuetypes[primary] == TYPE_STR);
 260     key.primary = primary;
 261     entry = find234(conf->tree, &key, NULL);
 262     assert(entry);
 263     return entry->value.u.stringval;
 264 }
 265
 266 char *conf_get_str_str_opt(Conf *conf, int primary, const char *secondary)
 267 {
 268     struct key key;
 269     struct conf_entry *entry;
 270
 271     assert(subkeytypes[primary] == TYPE_STR);
 272     assert(valuetypes[primary] == TYPE_STR);
 273     key.primary = primary;
 274     key.secondary.s = (char *)secondary;
 275     entry = find234(conf->tree, &key, NULL);
 276     return entry ? entry->value.u.stringval : NULL;
 277 }
 278
 279 char *conf_get_str_str(Conf *conf, int primary, const char *secondary)
 280 {
 281     char *ret = conf_get_str_str_opt(conf, primary, secondary);
 282     assert(ret);
 283     return ret;
 284 }
 285
 286 char *conf_get_str_strs(Conf *conf, int primary,
 287                        char *subkeyin, char **subkeyout)
 288 {
 289     struct key key;
 290     struct conf_entry *entry;
 291
 292     assert(subkeytypes[primary] == TYPE_STR);
 293     assert(valuetypes[primary] == TYPE_STR);
 294     key.primary = primary;
 295     if (subkeyin) {
 296         key.secondary.s = subkeyin;
 297         entry = findrel234(conf->tree, &key, NULL, REL234_GT);
 298     } else {
 299         key.secondary.s = "";
 300         entry = findrel234(conf->tree, &key, NULL, REL234_GE);
 301     }
 302     if (!entry || entry->key.primary != primary)
 303         return NULL;
 304     *subkeyout = entry->key.secondary.s;
 305     return entry->value.u.stringval;
 306 }
 307
 308 char *conf_get_str_nthstrkey(Conf *conf, int primary, int n)
 309 {
 310     struct key key;
 311     struct conf_entry *entry;
 312     int index;
 313
 314     assert(subkeytypes[primary] == TYPE_STR);
 315     assert(valuetypes[primary] == TYPE_STR);
 316     key.primary = primary;
 317     key.secondary.s = "";
 318     entry = findrelpos234(conf->tree, &key, NULL, REL234_GE, &index);
 319     if (!entry || entry->key.primary != primary)
 320         return NULL;
 321     entry = index234(conf->tree, index + n);
 322     if (!entry || entry->key.primary != primary)
 323         return NULL;
 324     return entry->key.secondary.s;
 325 }
 326
 327 Filename *conf_get_filename(Conf *conf, int primary)
 328 {
 329     struct key key;
 330     struct conf_entry *entry;
 331
 332     assert(subkeytypes[primary] == TYPE_NONE);
 333     assert(valuetypes[primary] == TYPE_FILENAME);
 334     key.primary = primary;
 335     entry = find234(conf->tree, &key, NULL);
 336     assert(entry);
 337     return entry->value.u.fileval;
 338 }
 339
 340 FontSpec *conf_get_fontspec(Conf *conf, int primary)
 341 {
 342     struct key key;
 343     struct conf_entry *entry;
 344
 345     assert(subkeytypes[primary] == TYPE_NONE);
 346     assert(valuetypes[primary] == TYPE_FONT);
 347     key.primary = primary;
 348     entry = find234(conf->tree, &key, NULL);
 349     assert(entry);
 350     return entry->value.u.fontval;
 351 }
 352
 353 void conf_set_int(Conf *conf, int primary, int value)
 354 {
 355     struct conf_entry *entry = snew(struct conf_entry);
 356
 357     assert(subkeytypes[primary] == TYPE_NONE);
 358     assert(valuetypes[primary] == TYPE_INT);
 359     entry->key.primary = primary;
 360     entry->value.u.intval = value;
 361     conf_insert(conf, entry);
 362 }
 363
 364 void conf_set_int_int(Conf *conf, int primary, int secondary, int value)
 365 {
 366     struct conf_entry *entry = snew(struct conf_entry);
 367
 368     assert(subkeytypes[primary] == TYPE_INT);
 369     assert(valuetypes[primary] == TYPE_INT);
 370     entry->key.primary = primary;
 371     entry->key.secondary.i = secondary;
 372     entry->value.u.intval = value;
 373     conf_insert(conf, entry);
 374 }
 375
 376 void conf_set_str(Conf *conf, int primary, const char *value)
 377 {
 378     struct conf_entry *entry = snew(struct conf_entry);
 379
 380     assert(subkeytypes[primary] == TYPE_NONE);
 381     assert(valuetypes[primary] == TYPE_STR);
 382     entry->key.primary = primary;
 383     entry->value.u.stringval = dupstr(value);
 384     conf_insert(conf, entry);
 385 }
 386
 387 void conf_set_str_str(Conf *conf, int primary, const char *secondary,
 388                       const char *value)
 389 {
 390     struct conf_entry *entry = snew(struct conf_entry);
 391
 392     assert(subkeytypes[primary] == TYPE_STR);
 393     assert(valuetypes[primary] == TYPE_STR);
 394     entry->key.primary = primary;
 395     entry->key.secondary.s = dupstr(secondary);
 396     entry->value.u.stringval = dupstr(value);
 397     conf_insert(conf, entry);
 398 }
 399
 400 void conf_del_str_str(Conf *conf, int primary, const char *secondary)
 401 {
 402     struct key key;
 403     struct conf_entry *entry;
 404
 405     assert(subkeytypes[primary] == TYPE_STR);
 406     assert(valuetypes[primary] == TYPE_STR);
 407     key.primary = primary;
 408     key.secondary.s = (char *)secondary;
 409     entry = find234(conf->tree, &key, NULL);
 410     if (entry) {
 411         del234(conf->tree, entry);
 412         free_entry(entry);
 413     }
 414  }
 415
 416 void conf_set_filename(Conf *conf, int primary, const Filename *value)
 417 {
 418     struct conf_entry *entry = snew(struct conf_entry);
 419
 420     assert(subkeytypes[primary] == TYPE_NONE);
 421     assert(valuetypes[primary] == TYPE_FILENAME);
 422     entry->key.primary = primary;
 423     entry->value.u.fileval = filename_copy(value);
 424     conf_insert(conf, entry);
 425 }
 426
 427 void conf_set_fontspec(Conf *conf, int primary, const FontSpec *value)
 428 {
 429     struct conf_entry *entry = snew(struct conf_entry);
 430
 431     assert(subkeytypes[primary] == TYPE_NONE);
 432     assert(valuetypes[primary] == TYPE_FONT);
 433     entry->key.primary = primary;
 434     entry->value.u.fontval = fontspec_copy(value);
 435     conf_insert(conf, entry);
 436 }
 437
 438 int conf_serialised_size(Conf *conf)
 439 {
 440     int i;
 441     struct conf_entry *entry;
 442     int size = 0;
 443
 444     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 445         size += 4;   /* primary key */
 446         switch (subkeytypes[entry->key.primary]) {
 447           case TYPE_INT:
 448             size += 4;
 449             break;
 450           case TYPE_STR:
 451             size += 1 + strlen(entry->key.secondary.s);
 452             break;
 453         }
 454         switch (valuetypes[entry->key.primary]) {
 455           case TYPE_INT:
 456             size += 4;
 457             break;
 458           case TYPE_STR:
 459             size += 1 + strlen(entry->value.u.stringval);
 460             break;
 461           case TYPE_FILENAME:
 462             size += filename_serialise(entry->value.u.fileval, NULL);
 463             break;
 464           case TYPE_FONT:
 465             size += fontspec_serialise(entry->value.u.fontval, NULL);
 466             break;
 467         }
 468     }
 469
 470     size += 4;                         /* terminator value */
 471
 472     return size;
 473 }
 474
 475 void conf_serialise(Conf *conf, void *vdata)
 476 {
 477     unsigned char *data = (unsigned char *)vdata;
 478     int i, len;
 479     struct conf_entry *entry;
 480
 481     for (i = 0; (entry = index234(conf->tree, i)) != NULL; i++) {
 482         PUT_32BIT_MSB_FIRST(data, entry->key.primary);
 483         data += 4;
 484
 485         switch (subkeytypes[entry->key.primary]) {
 486           case TYPE_INT:
 487             PUT_32BIT_MSB_FIRST(data, entry->key.secondary.i);
 488             data += 4;
 489             break;
 490           case TYPE_STR:
 491             len = strlen(entry->key.secondary.s);
 492             memcpy(data, entry->key.secondary.s, len);
 493             data += len;
 494             *data++ = 0;
 495             break;
 496         }
 497         switch (valuetypes[entry->key.primary]) {
 498           case TYPE_INT:
 499             PUT_32BIT_MSB_FIRST(data, entry->value.u.intval);
 500             data += 4;
 501             break;
 502           case TYPE_STR:
 503             len = strlen(entry->value.u.stringval);
 504             memcpy(data, entry->value.u.stringval, len);
 505             data += len;
 506             *data++ = 0;
 507             break;
 508           case TYPE_FILENAME:
 509             data += filename_serialise(entry->value.u.fileval, data);
 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     unsigned primary;
 526     int used;
 527     unsigned char *zero;
 528
 529     while (maxsize >= 4) {
 530         primary = GET_32BIT_MSB_FIRST(data);
 531         data += 4, maxsize -= 4;
 532
 533         if (primary >= N_CONFIG_OPTIONS)
 534             break;
 535
 536         entry = snew(struct conf_entry);
 537         entry->key.primary = primary;
 538
 539         switch (subkeytypes[entry->key.primary]) {
 540           case TYPE_INT:
 541             if (maxsize < 4) {
 542                 sfree(entry);
 543                 goto done;
 544             }
 545             entry->key.secondary.i = toint(GET_32BIT_MSB_FIRST(data));
 546             data += 4, maxsize -= 4;
 547             break;
 548           case TYPE_STR:
 549             zero = memchr(data, 0, maxsize);
 550             if (!zero) {
 551                 sfree(entry);
 552                 goto done;
 553             }
 554             entry->key.secondary.s = dupstr((char *)data);
 555             maxsize -= (zero + 1 - data);
 556             data = zero + 1;
 557             break;
 558         }
 559
 560         switch (valuetypes[entry->key.primary]) {
 561           case TYPE_INT:
 562             if (maxsize < 4) {
 563                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 564                     sfree(entry->key.secondary.s);
 565                 sfree(entry);
 566                 goto done;
 567             }
 568             entry->value.u.intval = toint(GET_32BIT_MSB_FIRST(data));
 569             data += 4, maxsize -= 4;
 570             break;
 571           case TYPE_STR:
 572             zero = memchr(data, 0, maxsize);
 573             if (!zero) {
 574                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 575                     sfree(entry->key.secondary.s);
 576                 sfree(entry);
 577                 goto done;
 578             }
 579             entry->value.u.stringval = dupstr((char *)data);
 580             maxsize -= (zero + 1 - data);
 581             data = zero + 1;
 582             break;
 583           case TYPE_FILENAME:
 584             entry->value.u.fileval =
 585                 filename_deserialise(data, maxsize, &used);
 586             if (!entry->value.u.fileval) {
 587                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 588                     sfree(entry->key.secondary.s);
 589                 sfree(entry);
 590                 goto done;
 591             }
 592             data += used;
 593             maxsize -= used;
 594             break;
 595           case TYPE_FONT:
 596             entry->value.u.fontval =
 597                 fontspec_deserialise(data, maxsize, &used);
 598             if (!entry->value.u.fontval) {
 599                 if (subkeytypes[entry->key.primary] == TYPE_STR)
 600                     sfree(entry->key.secondary.s);
 601                 sfree(entry);
 602                 goto done;
 603             }
 604             data += used;
 605             maxsize -= used;
 606             break;
 607         }
 608         conf_insert(conf, entry);
 609     }
 610
 611     done:
 612     return (int)(data - start);
 613 }