crypto/openssl-0.9/crypto/objects/o_names.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 #include <openssl/err.h>
   6 #include <openssl/lhash.h>
   7 #include <openssl/objects.h>
   8 #include <openssl/safestack.h>
   9 #include <openssl/e_os2.h>
  10
  11 /* Later versions of DEC C has started to add lnkage information to certain
  12  * functions, which makes it tricky to use them as values to regular function
  13  * pointers.  One way is to define a macro that takes care of casting them
  14  * correctly.
  15  */
  16 #ifdef OPENSSL_SYS_VMS_DECC
  17 # define OPENSSL_strcmp (int (*)(const char *,const char *))strcmp
  18 #else
  19 # define OPENSSL_strcmp strcmp
  20 #endif
  21
  22 /* I use the ex_data stuff to manage the identifiers for the obj_name_types
  23  * that applications may define.  I only really use the free function field.
  24  */
  25 static LHASH *names_lh=NULL;
  26 static int names_type_num=OBJ_NAME_TYPE_NUM;
  27
  28 typedef struct name_funcs_st
  29         {
  30         unsigned long (*hash_func)(const char *name);
  31         int (*cmp_func)(const char *a,const char *b);
  32         void (*free_func)(const char *, int, const char *);
  33         } NAME_FUNCS;
  34
  35 DECLARE_STACK_OF(NAME_FUNCS)
  36 IMPLEMENT_STACK_OF(NAME_FUNCS)
  37
  38 static STACK_OF(NAME_FUNCS) *name_funcs_stack;
  39
  40 /* The LHASH callbacks now use the raw "void *" prototypes and do per-variable
  41  * casting in the functions. This prevents function pointer casting without the
  42  * need for macro-generated wrapper functions. */
  43
  44 /* static unsigned long obj_name_hash(OBJ_NAME *a); */
  45 static unsigned long obj_name_hash(const void *a_void);
  46 /* static int obj_name_cmp(OBJ_NAME *a,OBJ_NAME *b); */
  47 static int obj_name_cmp(const void *a_void,const void *b_void);
  48
  49 int OBJ_NAME_init(void)
  50         {
  51         if (names_lh != NULL) return(1);
  52         MemCheck_off();
  53         names_lh=lh_new(obj_name_hash, obj_name_cmp);
  54         MemCheck_on();
  55         return(names_lh != NULL);
  56         }
  57
  58 int OBJ_NAME_new_index(unsigned long (*hash_func)(const char *),
  59         int (*cmp_func)(const char *, const char *),
  60         void (*free_func)(const char *, int, const char *))
  61         {
  62         int ret;
  63         int i;
  64         NAME_FUNCS *name_funcs;
  65
  66         if (name_funcs_stack == NULL)
  67                 {
  68                 MemCheck_off();
  69                 name_funcs_stack=sk_NAME_FUNCS_new_null();
  70                 MemCheck_on();
  71                 }
  72         if ((name_funcs_stack == NULL))
  73                 {
  74                 /* ERROR */
  75                 return(0);
  76                 }
  77         ret=names_type_num;
  78         names_type_num++;
  79         for (i=sk_NAME_FUNCS_num(name_funcs_stack); i<names_type_num; i++)
  80                 {
  81                 MemCheck_off();
  82                 name_funcs = OPENSSL_malloc(sizeof(NAME_FUNCS));
  83                 MemCheck_on();
  84                 if (!name_funcs)
  85                         {
  86                         OBJerr(OBJ_F_OBJ_NAME_NEW_INDEX,ERR_R_MALLOC_FAILURE);
  87                         return(0);
  88                         }
  89                 name_funcs->hash_func = lh_strhash;
  90                 name_funcs->cmp_func = OPENSSL_strcmp;
  91                 name_funcs->free_func = 0; /* NULL is often declared to
  92                                                 * ((void *)0), which according
  93                                                 * to Compaq C is not really
  94                                                 * compatible with a function
  95                                                 * pointer.      -- Richard Levitte*/
  96                 MemCheck_off();
  97                 sk_NAME_FUNCS_push(name_funcs_stack,name_funcs);
  98                 MemCheck_on();
  99                 }
 100         name_funcs = sk_NAME_FUNCS_value(name_funcs_stack, ret);
 101         if (hash_func != NULL)
 102                 name_funcs->hash_func = hash_func;
 103         if (cmp_func != NULL)
 104                 name_funcs->cmp_func = cmp_func;
 105         if (free_func != NULL)
 106                 name_funcs->free_func = free_func;
 107         return(ret);
 108         }
 109
 110 /* static int obj_name_cmp(OBJ_NAME *a, OBJ_NAME *b) */
 111 static int obj_name_cmp(const void *a_void, const void *b_void)
 112         {
 113         int ret;
 114         const OBJ_NAME *a = (const OBJ_NAME *)a_void;
 115         const OBJ_NAME *b = (const OBJ_NAME *)b_void;
 116
 117         ret=a->type-b->type;
 118         if (ret == 0)
 119                 {
 120                 if ((name_funcs_stack != NULL)
 121                         && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type))
 122                         {
 123                         ret=sk_NAME_FUNCS_value(name_funcs_stack,
 124                                 a->type)->cmp_func(a->name,b->name);
 125                         }
 126                 else
 127                         ret=strcmp(a->name,b->name);
 128                 }
 129         return(ret);
 130         }
 131
 132 /* static unsigned long obj_name_hash(OBJ_NAME *a) */
 133 static unsigned long obj_name_hash(const void *a_void)
 134         {
 135         unsigned long ret;
 136         const OBJ_NAME *a = (const OBJ_NAME *)a_void;
 137
 138         if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type))
 139                 {
 140                 ret=sk_NAME_FUNCS_value(name_funcs_stack,
 141                         a->type)->hash_func(a->name);
 142                 }
 143         else
 144                 {
 145                 ret=lh_strhash(a->name);
 146                 }
 147         ret^=a->type;
 148         return(ret);
 149         }
 150
 151 const char *OBJ_NAME_get(const char *name, int type)
 152         {
 153         OBJ_NAME on,*ret;
 154         int num=0,alias;
 155
 156         if (name == NULL) return(NULL);
 157         if ((names_lh == NULL) && !OBJ_NAME_init()) return(NULL);
 158
 159         alias=type&OBJ_NAME_ALIAS;
 160         type&= ~OBJ_NAME_ALIAS;
 161
 162         on.name=name;
 163         on.type=type;
 164
 165         for (;;)
 166         {
 167                 ret=(OBJ_NAME *)lh_retrieve(names_lh,&on);
 168                 if (ret == NULL) return(NULL);
 169                 if ((ret->alias) && !alias)
 170                         {
 171                         if (++num > 10) return(NULL);
 172                         on.name=ret->data;
 173                         }
 174                 else
 175                         {
 176                         return(ret->data);
 177                         }
 178                 }
 179         }
 180
 181 int OBJ_NAME_add(const char *name, int type, const char *data)
 182         {
 183         OBJ_NAME *onp,*ret;
 184         int alias;
 185
 186         if ((names_lh == NULL) && !OBJ_NAME_init()) return(0);
 187
 188         alias=type&OBJ_NAME_ALIAS;
 189         type&= ~OBJ_NAME_ALIAS;
 190
 191         onp=(OBJ_NAME *)OPENSSL_malloc(sizeof(OBJ_NAME));
 192         if (onp == NULL)
 193                 {
 194                 /* ERROR */
 195                 return(0);
 196                 }
 197
 198         onp->name=name;
 199         onp->alias=alias;
 200         onp->type=type;
 201         onp->data=data;
 202
 203         ret=(OBJ_NAME *)lh_insert(names_lh,onp);
 204         if (ret != NULL)
 205                 {
 206                 /* free things */
 207                 if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type))
 208                         {
 209                         /* XXX: I'm not sure I understand why the free
 210                          * function should get three arguments...
 211                          * -- Richard Levitte
 212                          */
 213                         sk_NAME_FUNCS_value(name_funcs_stack,
 214                                 ret->type)->free_func(ret->name,ret->type,ret->data);
 215                         }
 216                 OPENSSL_free(ret);
 217                 }
 218         else
 219                 {
 220                 if (lh_error(names_lh))
 221                         {
 222                         /* ERROR */
 223                         return(0);
 224                         }
 225                 }
 226         return(1);
 227         }
 228
 229 int OBJ_NAME_remove(const char *name, int type)
 230         {
 231         OBJ_NAME on,*ret;
 232
 233         if (names_lh == NULL) return(0);
 234
 235         type&= ~OBJ_NAME_ALIAS;
 236         on.name=name;
 237         on.type=type;
 238         ret=(OBJ_NAME *)lh_delete(names_lh,&on);
 239         if (ret != NULL)
 240                 {
 241                 /* free things */
 242                 if ((name_funcs_stack != NULL) && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type))
 243                         {
 244                         /* XXX: I'm not sure I understand why the free
 245                          * function should get three arguments...
 246                          * -- Richard Levitte
 247                          */
 248                         sk_NAME_FUNCS_value(name_funcs_stack,
 249                                 ret->type)->free_func(ret->name,ret->type,ret->data);
 250                         }
 251                 OPENSSL_free(ret);
 252                 return(1);
 253                 }
 254         else
 255                 return(0);
 256         }
 257
 258 struct doall
 259         {
 260         int type;
 261         void (*fn)(const OBJ_NAME *,void *arg);
 262         void *arg;
 263         };
 264
 265 static void do_all_fn(const OBJ_NAME *name,struct doall *d)
 266         {
 267         if(name->type == d->type)
 268                 d->fn(name,d->arg);
 269         }
 270
 271 static IMPLEMENT_LHASH_DOALL_ARG_FN(do_all_fn, const OBJ_NAME *, struct doall *)
 272
 273 void OBJ_NAME_do_all(int type,void (*fn)(const OBJ_NAME *,void *arg),void *arg)
 274         {
 275         struct doall d;
 276
 277         d.type=type;
 278         d.fn=fn;
 279         d.arg=arg;
 280
 281         lh_doall_arg(names_lh,LHASH_DOALL_ARG_FN(do_all_fn),&d);
 282         }
 283
 284 struct doall_sorted
 285         {
 286         int type;
 287         int n;
 288         const OBJ_NAME **names;
 289         };
 290
 291 static void do_all_sorted_fn(const OBJ_NAME *name,void *d_)
 292         {
 293         struct doall_sorted *d=d_;
 294
 295         if(name->type != d->type)
 296                 return;
 297
 298         d->names[d->n++]=name;
 299         }
 300
 301 static int do_all_sorted_cmp(const void *n1_,const void *n2_)
 302         {
 303         const OBJ_NAME * const *n1=n1_;
 304         const OBJ_NAME * const *n2=n2_;
 305
 306         return strcmp((*n1)->name,(*n2)->name);
 307         }
 308
 309 void OBJ_NAME_do_all_sorted(int type,void (*fn)(const OBJ_NAME *,void *arg),
 310                                 void *arg)
 311         {
 312         struct doall_sorted d;
 313         int n;
 314
 315         d.type=type;
 316         d.names=OPENSSL_malloc(lh_num_items(names_lh)*sizeof *d.names);
 317         d.n=0;
 318         OBJ_NAME_do_all(type,do_all_sorted_fn,&d);
 319
 320         qsort((void *)d.names,d.n,sizeof *d.names,do_all_sorted_cmp);
 321
 322         for(n=0 ; n < d.n ; ++n)
 323                 fn(d.names[n],arg);
 324
 325         OPENSSL_free((void *)d.names);
 326         }
 327
 328 static int free_type;
 329
 330 static void names_lh_free(OBJ_NAME *onp)
 331 {
 332         if(onp == NULL)
 333                 return;
 334
 335         if ((free_type < 0) || (free_type == onp->type))
 336                 {
 337                 OBJ_NAME_remove(onp->name,onp->type);
 338                 }
 339         }
 340
 341 static IMPLEMENT_LHASH_DOALL_FN(names_lh_free, OBJ_NAME *)
 342
 343 static void name_funcs_free(NAME_FUNCS *ptr)
 344         {
 345         OPENSSL_free(ptr);
 346         }
 347
 348 void OBJ_NAME_cleanup(int type)
 349         {
 350         unsigned long down_load;
 351
 352         if (names_lh == NULL) return;
 353
 354         free_type=type;
 355         down_load=names_lh->down_load;
 356         names_lh->down_load=0;
 357
 358         lh_doall(names_lh,LHASH_DOALL_FN(names_lh_free));
 359         if (type < 0)
 360                 {
 361                 lh_free(names_lh);
 362                 sk_NAME_FUNCS_pop_free(name_funcs_stack,name_funcs_free);
 363                 names_lh=NULL;
 364                 name_funcs_stack = NULL;
 365                 }
 366         else
 367                 names_lh->down_load=down_load;
 368         }
 369