o_names.c 10.5 KB
Newer Older
C
code4lala 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
/*
 * Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <openssl/err.h>
#include <openssl/lhash.h>
#include <openssl/objects.h>
#include <openssl/safestack.h>
#include <openssl/e_os2.h>
#include "internal/thread_once.h"
#include "crypto/lhash.h"
#include "obj_local.h"
#include "e_os.h"

/*
 * We define this wrapper for two reasons. Firstly, later versions of
 * DEC C add linkage information to certain functions, which makes it
 * tricky to use them as values to regular function pointers.
 * Secondly, in the EDK2 build environment, the strcasecmp function is
 * actually an external function with the Microsoft ABI, so we can't
 * transparently assign function pointers to it.
 */
#if defined(OPENSSL_SYS_VMS_DECC) || defined(OPENSSL_SYS_UEFI)
static int obj_strcasecmp(const char *a, const char *b)
{
    return strcasecmp(a, b);
}
#else
#define obj_strcasecmp strcasecmp
#endif

/*
 * I use the ex_data stuff to manage the identifiers for the obj_name_types
 * that applications may define.  I only really use the free function field.
 */
static LHASH_OF(OBJ_NAME) *names_lh = NULL;
static int names_type_num = OBJ_NAME_TYPE_NUM;
static CRYPTO_RWLOCK *obj_lock = NULL;

struct name_funcs_st {
    unsigned long (*hash_func) (const char *name);
    int (*cmp_func) (const char *a, const char *b);
    void (*free_func) (const char *, int, const char *);
};

static STACK_OF(NAME_FUNCS) *name_funcs_stack;

/*
 * The LHASH callbacks now use the raw "void *" prototypes and do
 * per-variable casting in the functions. This prevents function pointer
 * casting without the need for macro-generated wrapper functions.
 */

static unsigned long obj_name_hash(const OBJ_NAME *a);
static int obj_name_cmp(const OBJ_NAME *a, const OBJ_NAME *b);

static CRYPTO_ONCE init = CRYPTO_ONCE_STATIC_INIT;
DEFINE_RUN_ONCE_STATIC(o_names_init)
{
    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
    names_lh = NULL;
    obj_lock = CRYPTO_THREAD_lock_new();
    if (obj_lock != NULL)
        names_lh = lh_OBJ_NAME_new(obj_name_hash, obj_name_cmp);
    if (names_lh == NULL) {
        CRYPTO_THREAD_lock_free(obj_lock);
        obj_lock = NULL;
    }
    CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
    return names_lh != NULL && obj_lock != NULL;
}

int OBJ_NAME_init(void)
{
    return RUN_ONCE(&init, o_names_init);
}

int OBJ_NAME_new_index(unsigned long (*hash_func) (const char *),
                       int (*cmp_func) (const char *, const char *),
                       void (*free_func) (const char *, int, const char *))
{
    int ret = 0, i, push;
    NAME_FUNCS *name_funcs;

    if (!OBJ_NAME_init())
        return 0;

    CRYPTO_THREAD_write_lock(obj_lock);

    if (name_funcs_stack == NULL) {
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
        name_funcs_stack = sk_NAME_FUNCS_new_null();
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
    }
    if (name_funcs_stack == NULL) {
        /* ERROR */
        goto out;
    }
    ret = names_type_num;
    names_type_num++;
    for (i = sk_NAME_FUNCS_num(name_funcs_stack); i < names_type_num; i++) {
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);
        name_funcs = OPENSSL_zalloc(sizeof(*name_funcs));
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);
        if (name_funcs == NULL) {
            OBJerr(OBJ_F_OBJ_NAME_NEW_INDEX, ERR_R_MALLOC_FAILURE);
            ret = 0;
            goto out;
        }
        name_funcs->hash_func = openssl_lh_strcasehash;
        name_funcs->cmp_func = obj_strcasecmp;
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_DISABLE);

        push = sk_NAME_FUNCS_push(name_funcs_stack, name_funcs);
        CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ENABLE);

        if (!push) {
            OBJerr(OBJ_F_OBJ_NAME_NEW_INDEX, ERR_R_MALLOC_FAILURE);
            OPENSSL_free(name_funcs);
            ret = 0;
            goto out;
        }
    }
    name_funcs = sk_NAME_FUNCS_value(name_funcs_stack, ret);
    if (hash_func != NULL)
        name_funcs->hash_func = hash_func;
    if (cmp_func != NULL)
        name_funcs->cmp_func = cmp_func;
    if (free_func != NULL)
        name_funcs->free_func = free_func;

out:
    CRYPTO_THREAD_unlock(obj_lock);
    return ret;
}

static int obj_name_cmp(const OBJ_NAME *a, const OBJ_NAME *b)
{
    int ret;

    ret = a->type - b->type;
    if (ret == 0) {
        if ((name_funcs_stack != NULL)
            && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type)) {
            ret = sk_NAME_FUNCS_value(name_funcs_stack,
                                      a->type)->cmp_func(a->name, b->name);
        } else
            ret = strcasecmp(a->name, b->name);
    }
    return ret;
}

static unsigned long obj_name_hash(const OBJ_NAME *a)
{
    unsigned long ret;

    if ((name_funcs_stack != NULL)
        && (sk_NAME_FUNCS_num(name_funcs_stack) > a->type)) {
        ret =
            sk_NAME_FUNCS_value(name_funcs_stack,
                                a->type)->hash_func(a->name);
    } else {
        ret = openssl_lh_strcasehash(a->name);
    }
    ret ^= a->type;
    return ret;
}

const char *OBJ_NAME_get(const char *name, int type)
{
    OBJ_NAME on, *ret;
    int num = 0, alias;
    const char *value = NULL;

    if (name == NULL)
        return NULL;
    if (!OBJ_NAME_init())
        return NULL;
    CRYPTO_THREAD_read_lock(obj_lock);

    alias = type & OBJ_NAME_ALIAS;
    type &= ~OBJ_NAME_ALIAS;

    on.name = name;
    on.type = type;

    for (;;) {
        ret = lh_OBJ_NAME_retrieve(names_lh, &on);
        if (ret == NULL)
            break;
        if ((ret->alias) && !alias) {
            if (++num > 10)
                break;
            on.name = ret->data;
        } else {
            value = ret->data;
            break;
        }
    }

    CRYPTO_THREAD_unlock(obj_lock);
    return value;
}

int OBJ_NAME_add(const char *name, int type, const char *data)
{
    OBJ_NAME *onp, *ret;
    int alias, ok = 0;

    if (!OBJ_NAME_init())
        return 0;

    alias = type & OBJ_NAME_ALIAS;
    type &= ~OBJ_NAME_ALIAS;

    onp = OPENSSL_malloc(sizeof(*onp));
    if (onp == NULL)
        return 0;

    onp->name = name;
    onp->alias = alias;
    onp->type = type;
    onp->data = data;

    CRYPTO_THREAD_write_lock(obj_lock);

    ret = lh_OBJ_NAME_insert(names_lh, onp);
    if (ret != NULL) {
        /* free things */
        if ((name_funcs_stack != NULL)
            && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type)) {
            /*
             * XXX: I'm not sure I understand why the free function should
             * get three arguments... -- Richard Levitte
             */
            sk_NAME_FUNCS_value(name_funcs_stack,
                                ret->type)->free_func(ret->name, ret->type,
                                                      ret->data);
        }
        OPENSSL_free(ret);
    } else {
        if (lh_OBJ_NAME_error(names_lh)) {
            /* ERROR */
            OPENSSL_free(onp);
            goto unlock;
        }
    }

    ok = 1;

unlock:
    CRYPTO_THREAD_unlock(obj_lock);
    return ok;
}

int OBJ_NAME_remove(const char *name, int type)
{
    OBJ_NAME on, *ret;
    int ok = 0;

    if (!OBJ_NAME_init())
        return 0;

    CRYPTO_THREAD_write_lock(obj_lock);

    type &= ~OBJ_NAME_ALIAS;
    on.name = name;
    on.type = type;
    ret = lh_OBJ_NAME_delete(names_lh, &on);
    if (ret != NULL) {
        /* free things */
        if ((name_funcs_stack != NULL)
            && (sk_NAME_FUNCS_num(name_funcs_stack) > ret->type)) {
            /*
             * XXX: I'm not sure I understand why the free function should
             * get three arguments... -- Richard Levitte
             */
            sk_NAME_FUNCS_value(name_funcs_stack,
                                ret->type)->free_func(ret->name, ret->type,
                                                      ret->data);
        }
        OPENSSL_free(ret);
        ok = 1;
    }

    CRYPTO_THREAD_unlock(obj_lock);
    return ok;
}

typedef struct {
    int type;
    void (*fn) (const OBJ_NAME *, void *arg);
    void *arg;
} OBJ_DOALL;

static void do_all_fn(const OBJ_NAME *name, OBJ_DOALL *d)
{
    if (name->type == d->type)
        d->fn(name, d->arg);
}

IMPLEMENT_LHASH_DOALL_ARG_CONST(OBJ_NAME, OBJ_DOALL);

void OBJ_NAME_do_all(int type, void (*fn) (const OBJ_NAME *, void *arg),
                     void *arg)
{
    OBJ_DOALL d;

    d.type = type;
    d.fn = fn;
    d.arg = arg;

    lh_OBJ_NAME_doall_OBJ_DOALL(names_lh, do_all_fn, &d);
}

struct doall_sorted {
    int type;
    int n;
    const OBJ_NAME **names;
};

static void do_all_sorted_fn(const OBJ_NAME *name, void *d_)
{
    struct doall_sorted *d = d_;

    if (name->type != d->type)
        return;

    d->names[d->n++] = name;
}

static int do_all_sorted_cmp(const void *n1_, const void *n2_)
{
    const OBJ_NAME *const *n1 = n1_;
    const OBJ_NAME *const *n2 = n2_;

    return strcmp((*n1)->name, (*n2)->name);
}

void OBJ_NAME_do_all_sorted(int type,
                            void (*fn) (const OBJ_NAME *, void *arg),
                            void *arg)
{
    struct doall_sorted d;
    int n;

    d.type = type;
    d.names =
        OPENSSL_malloc(sizeof(*d.names) * lh_OBJ_NAME_num_items(names_lh));
    /* Really should return an error if !d.names...but its a void function! */
    if (d.names != NULL) {
        d.n = 0;
        OBJ_NAME_do_all(type, do_all_sorted_fn, &d);

        qsort((void *)d.names, d.n, sizeof(*d.names), do_all_sorted_cmp);

        for (n = 0; n < d.n; ++n)
            fn(d.names[n], arg);

        OPENSSL_free((void *)d.names);
    }
}

static int free_type;

static void names_lh_free_doall(OBJ_NAME *onp)
{
    if (onp == NULL)
        return;

    if (free_type < 0 || free_type == onp->type)
        OBJ_NAME_remove(onp->name, onp->type);
}

static void name_funcs_free(NAME_FUNCS *ptr)
{
    OPENSSL_free(ptr);
}

void OBJ_NAME_cleanup(int type)
{
    unsigned long down_load;

    if (names_lh == NULL)
        return;

    free_type = type;
    down_load = lh_OBJ_NAME_get_down_load(names_lh);
    lh_OBJ_NAME_set_down_load(names_lh, 0);

    lh_OBJ_NAME_doall(names_lh, names_lh_free_doall);
    if (type < 0) {
        lh_OBJ_NAME_free(names_lh);
        sk_NAME_FUNCS_pop_free(name_funcs_stack, name_funcs_free);
        CRYPTO_THREAD_lock_free(obj_lock);
        names_lh = NULL;
        name_funcs_stack = NULL;
        obj_lock = NULL;
    } else
        lh_OBJ_NAME_set_down_load(names_lh, down_load);
}