crypto/objects/o_names.c

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