


#define OPENSSL_SUPPRESS_DEPRECATED

#include "eng_local.h"


static ENGINE *engine_list_head = NULL;
static ENGINE *engine_list_tail = NULL;


static ENGINE *engine_dyn_list_head = NULL;
static ENGINE *engine_dyn_list_tail = NULL;



static void engine_list_cleanup(void)
{
    ENGINE *iterator = engine_list_head;

    while (iterator != NULL) {
        ENGINE_remove(iterator);
        iterator = engine_list_head;
    }
    return;
}


static int engine_list_add(ENGINE *e)
{
    int conflict = 0;
    ENGINE *iterator = NULL;
    int ref;

    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    iterator = engine_list_head;
    while (iterator && !conflict) {
        conflict = (strcmp(iterator->id, e->id) == 0);
        iterator = iterator->next;
    }
    if (conflict) {
        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_CONFLICTING_ENGINE_ID);
        return 0;
    }

    
    if (!CRYPTO_UP_REF(&e->struct_ref, &ref)) {
            ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
            return 0;
    }
    ENGINE_REF_PRINT(e, 0, 1);
    if (engine_list_head == NULL) {
        
        if (engine_list_tail != NULL) {
            CRYPTO_DOWN_REF(&e->struct_ref, &ref);
            ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
            return 0;
        }
        
        if (!engine_cleanup_add_last(engine_list_cleanup)) {
            CRYPTO_DOWN_REF(&e->struct_ref, &ref);
            ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
            return 0;
        }
        engine_list_head = e;
        e->prev = NULL;
    } else {
        
        if ((engine_list_tail == NULL) || (engine_list_tail->next != NULL)) {
            CRYPTO_DOWN_REF(&e->struct_ref, &ref);
            ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
            return 0;
        }
        engine_list_tail->next = e;
        e->prev = engine_list_tail;
    }

    
    engine_list_tail = e;
    e->next = NULL;
    return 1;
}

static int engine_list_remove(ENGINE *e)
{
    ENGINE *iterator;

    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    
    iterator = engine_list_head;
    while (iterator && (iterator != e))
        iterator = iterator->next;
    if (iterator == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_ENGINE_IS_NOT_IN_LIST);
        return 0;
    }
    
    if (e->next)
        e->next->prev = e->prev;
    if (e->prev)
        e->prev->next = e->next;
    
    if (engine_list_head == e)
        engine_list_head = e->next;
    if (engine_list_tail == e)
        engine_list_tail = e->prev;
    engine_free_util(e, 0);
    return 1;
}


int engine_add_dynamic_id(ENGINE *e, ENGINE_DYNAMIC_ID dynamic_id,
                          int not_locked)
{
    int result = 0;
    ENGINE *iterator = NULL;

    if (e == NULL)
        return 0;

    if (e->dynamic_id == NULL && dynamic_id == NULL)
        return 0;

    if (not_locked && !CRYPTO_THREAD_write_lock(global_engine_lock))
        return 0;

    if (dynamic_id != NULL) {
        iterator = engine_dyn_list_head;
        while (iterator != NULL) {
            if (iterator->dynamic_id == dynamic_id)
                goto err;
            iterator = iterator->next;
        }
        if (e->dynamic_id != NULL)
            goto err;
        e->dynamic_id = dynamic_id;
    }

    if (engine_dyn_list_head == NULL) {
        
        if (engine_dyn_list_tail != NULL)
            goto err;
        engine_dyn_list_head = e;
        e->prev_dyn = NULL;
    } else {
        
        if (engine_dyn_list_tail == NULL
            || engine_dyn_list_tail->next_dyn != NULL)
            goto err;
        engine_dyn_list_tail->next_dyn = e;
        e->prev_dyn = engine_dyn_list_tail;
    }

    engine_dyn_list_tail = e;
    e->next_dyn = NULL;
    result = 1;

 err:
    if (not_locked)
        CRYPTO_THREAD_unlock(global_engine_lock);
    return result;
}


void engine_remove_dynamic_id(ENGINE *e, int not_locked)
{
    if (e == NULL || e->dynamic_id == NULL)
        return;

    if (not_locked && !CRYPTO_THREAD_write_lock(global_engine_lock))
        return;

    e->dynamic_id = NULL;

    
    if (e->next_dyn != NULL)
        e->next_dyn->prev_dyn = e->prev_dyn;
    if (e->prev_dyn != NULL)
        e->prev_dyn->next_dyn = e->next_dyn;
    
    if (engine_dyn_list_head == e)
        engine_dyn_list_head = e->next_dyn;
    if (engine_dyn_list_tail == e)
        engine_dyn_list_tail = e->prev_dyn;

    if (not_locked)
        CRYPTO_THREAD_unlock(global_engine_lock);
}


ENGINE *ENGINE_get_first(void)
{
    ENGINE *ret;

    if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
        
        ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
        return NULL;
    }

    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return NULL;
    ret = engine_list_head;
    if (ret) {
        int ref;

        if (!CRYPTO_UP_REF(&ret->struct_ref, &ref)) {
            ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
            return NULL;
        }
        ENGINE_REF_PRINT(ret, 0, 1);
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    return ret;
}

ENGINE *ENGINE_get_last(void)
{
    ENGINE *ret;

    if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
        
        ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
        return NULL;
    }

    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return NULL;
    ret = engine_list_tail;
    if (ret) {
        int ref;

        if (!CRYPTO_UP_REF(&ret->struct_ref, &ref)) {
            ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
            return NULL;
        }
        ENGINE_REF_PRINT(ret, 0, 1);
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    return ret;
}


ENGINE *ENGINE_get_next(ENGINE *e)
{
    ENGINE *ret = NULL;
    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return NULL;
    }
    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return NULL;
    ret = e->next;
    if (ret) {
        int ref;

        
        if (!CRYPTO_UP_REF(&ret->struct_ref, &ref)) {
            ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
            return NULL;
        }
        ENGINE_REF_PRINT(ret, 0, 1);
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    
    ENGINE_free(e);
    return ret;
}

ENGINE *ENGINE_get_prev(ENGINE *e)
{
    ENGINE *ret = NULL;
    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return NULL;
    }
    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return NULL;
    ret = e->prev;
    if (ret) {
        int ref;

        
        if (!CRYPTO_UP_REF(&ret->struct_ref, &ref)) {
            ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
            return NULL;
        }
        ENGINE_REF_PRINT(ret, 0, 1);
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    
    ENGINE_free(e);
    return ret;
}


int ENGINE_add(ENGINE *e)
{
    int to_return = 1;
    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    if ((e->id == NULL) || (e->name == NULL)) {
        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_ID_OR_NAME_MISSING);
        return 0;
    }
    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return 0;
    if (!engine_list_add(e)) {
        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
        to_return = 0;
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    return to_return;
}


int ENGINE_remove(ENGINE *e)
{
    int to_return = 1;
    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return 0;
    if (!engine_list_remove(e)) {
        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_INTERNAL_LIST_ERROR);
        to_return = 0;
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    return to_return;
}

static void engine_cpy(ENGINE *dest, const ENGINE *src)
{
    dest->id = src->id;
    dest->name = src->name;
    dest->rsa_meth = src->rsa_meth;
#ifndef OPENSSL_NO_DSA
    dest->dsa_meth = src->dsa_meth;
#endif
#ifndef OPENSSL_NO_DH
    dest->dh_meth = src->dh_meth;
#endif
#ifndef OPENSSL_NO_EC
    dest->ec_meth = src->ec_meth;
#endif
    dest->rand_meth = src->rand_meth;
    dest->ciphers = src->ciphers;
    dest->digests = src->digests;
    dest->pkey_meths = src->pkey_meths;
    dest->destroy = src->destroy;
    dest->init = src->init;
    dest->finish = src->finish;
    dest->ctrl = src->ctrl;
    dest->load_privkey = src->load_privkey;
    dest->load_pubkey = src->load_pubkey;
    dest->cmd_defns = src->cmd_defns;
    dest->flags = src->flags;
    dest->dynamic_id = src->dynamic_id;
    engine_add_dynamic_id(dest, NULL, 0);
}

ENGINE *ENGINE_by_id(const char *id)
{
    ENGINE *iterator;
    char *load_dir = NULL;
    if (id == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return NULL;
    }
    ENGINE_load_builtin_engines();

    if (!RUN_ONCE(&engine_lock_init, do_engine_lock_init)) {
        
        ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
        return NULL;
    }

    if (!CRYPTO_THREAD_write_lock(global_engine_lock))
        return NULL;
    iterator = engine_list_head;
    while (iterator && (strcmp(id, iterator->id) != 0))
        iterator = iterator->next;
    if (iterator != NULL) {
        
        if (iterator->flags & ENGINE_FLAGS_BY_ID_COPY) {
            ENGINE *cp = ENGINE_new();
            if (cp == NULL)
                iterator = NULL;
            else {
                engine_cpy(cp, iterator);
                iterator = cp;
            }
        } else {
            int ref;

            if (!CRYPTO_UP_REF(&iterator->struct_ref, &ref)) {
                CRYPTO_THREAD_unlock(global_engine_lock);
                ERR_raise(ERR_LIB_ENGINE, ERR_R_CRYPTO_LIB);
                return NULL;
            }
            ENGINE_REF_PRINT(iterator, 0, 1);
        }
    }
    CRYPTO_THREAD_unlock(global_engine_lock);
    if (iterator != NULL)
        return iterator;
    
    if (strcmp(id, "dynamic")) {
        if ((load_dir = ossl_safe_getenv("OPENSSL_ENGINES")) == NULL)
            load_dir = ENGINESDIR;
        iterator = ENGINE_by_id("dynamic");
        if (!iterator || !ENGINE_ctrl_cmd_string(iterator, "ID", id, 0) ||
            !ENGINE_ctrl_cmd_string(iterator, "DIR_LOAD", "2", 0) ||
            !ENGINE_ctrl_cmd_string(iterator, "DIR_ADD",
                                    load_dir, 0) ||
            !ENGINE_ctrl_cmd_string(iterator, "LIST_ADD", "1", 0) ||
            !ENGINE_ctrl_cmd_string(iterator, "LOAD", NULL, 0))
            goto notfound;
        return iterator;
    }
 notfound:
    ENGINE_free(iterator);
    ERR_raise_data(ERR_LIB_ENGINE, ENGINE_R_NO_SUCH_ENGINE, "id=%s", id);
    return NULL;
    
}

int ENGINE_up_ref(ENGINE *e)
{
    int i;
    if (e == NULL) {
        ERR_raise(ERR_LIB_ENGINE, ERR_R_PASSED_NULL_PARAMETER);
        return 0;
    }
    CRYPTO_UP_REF(&e->struct_ref, &i);
    return 1;
}
