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https://github.com/ossrs/srs.git
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350 lines
9.2 KiB
C
350 lines
9.2 KiB
C
/*
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* Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "dso_local.h"
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#include "internal/refcount.h"
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static DSO_METHOD *default_DSO_meth = NULL;
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static DSO *DSO_new_method(DSO_METHOD *meth)
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{
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DSO *ret;
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if (default_DSO_meth == NULL) {
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/*
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* We default to DSO_METH_openssl() which in turn defaults to
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* stealing the "best available" method. Will fallback to
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* DSO_METH_null() in the worst case.
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*/
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default_DSO_meth = DSO_METHOD_openssl();
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}
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ret = OPENSSL_zalloc(sizeof(*ret));
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if (ret == NULL) {
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DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->meth_data = sk_void_new_null();
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if (ret->meth_data == NULL) {
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/* sk_new doesn't generate any errors so we do */
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DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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OPENSSL_free(ret);
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return NULL;
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}
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ret->meth = default_DSO_meth;
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ret->references = 1;
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ret->lock = CRYPTO_THREAD_lock_new();
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if (ret->lock == NULL) {
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DSOerr(DSO_F_DSO_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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sk_void_free(ret->meth_data);
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OPENSSL_free(ret);
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return NULL;
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}
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if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
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DSO_free(ret);
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ret = NULL;
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}
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return ret;
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}
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DSO *DSO_new(void)
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{
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return DSO_new_method(NULL);
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}
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int DSO_free(DSO *dso)
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{
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int i;
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if (dso == NULL)
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return 1;
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if (CRYPTO_DOWN_REF(&dso->references, &i, dso->lock) <= 0)
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return 0;
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REF_PRINT_COUNT("DSO", dso);
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if (i > 0)
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return 1;
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REF_ASSERT_ISNT(i < 0);
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if ((dso->flags & DSO_FLAG_NO_UNLOAD_ON_FREE) == 0) {
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if ((dso->meth->dso_unload != NULL) && !dso->meth->dso_unload(dso)) {
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DSOerr(DSO_F_DSO_FREE, DSO_R_UNLOAD_FAILED);
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return 0;
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}
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}
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if ((dso->meth->finish != NULL) && !dso->meth->finish(dso)) {
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DSOerr(DSO_F_DSO_FREE, DSO_R_FINISH_FAILED);
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return 0;
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}
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sk_void_free(dso->meth_data);
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OPENSSL_free(dso->filename);
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OPENSSL_free(dso->loaded_filename);
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CRYPTO_THREAD_lock_free(dso->lock);
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OPENSSL_free(dso);
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return 1;
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}
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int DSO_flags(DSO *dso)
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{
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return ((dso == NULL) ? 0 : dso->flags);
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}
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int DSO_up_ref(DSO *dso)
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{
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int i;
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if (dso == NULL) {
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DSOerr(DSO_F_DSO_UP_REF, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (CRYPTO_UP_REF(&dso->references, &i, dso->lock) <= 0)
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return 0;
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REF_PRINT_COUNT("DSO", r);
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REF_ASSERT_ISNT(i < 2);
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return ((i > 1) ? 1 : 0);
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}
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DSO *DSO_load(DSO *dso, const char *filename, DSO_METHOD *meth, int flags)
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{
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DSO *ret;
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int allocated = 0;
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if (dso == NULL) {
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ret = DSO_new_method(meth);
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if (ret == NULL) {
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DSOerr(DSO_F_DSO_LOAD, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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allocated = 1;
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/* Pass the provided flags to the new DSO object */
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if (DSO_ctrl(ret, DSO_CTRL_SET_FLAGS, flags, NULL) < 0) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_CTRL_FAILED);
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goto err;
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}
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} else
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ret = dso;
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/* Don't load if we're currently already loaded */
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if (ret->filename != NULL) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_DSO_ALREADY_LOADED);
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goto err;
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}
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/*
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* filename can only be NULL if we were passed a dso that already has one
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* set.
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*/
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if (filename != NULL)
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if (!DSO_set_filename(ret, filename)) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_SET_FILENAME_FAILED);
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goto err;
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}
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filename = ret->filename;
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if (filename == NULL) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_NO_FILENAME);
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goto err;
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}
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if (ret->meth->dso_load == NULL) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_UNSUPPORTED);
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goto err;
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}
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if (!ret->meth->dso_load(ret)) {
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DSOerr(DSO_F_DSO_LOAD, DSO_R_LOAD_FAILED);
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goto err;
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}
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/* Load succeeded */
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return ret;
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err:
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if (allocated)
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DSO_free(ret);
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return NULL;
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}
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DSO_FUNC_TYPE DSO_bind_func(DSO *dso, const char *symname)
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{
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DSO_FUNC_TYPE ret = NULL;
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if ((dso == NULL) || (symname == NULL)) {
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DSOerr(DSO_F_DSO_BIND_FUNC, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if (dso->meth->dso_bind_func == NULL) {
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DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_UNSUPPORTED);
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return NULL;
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}
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if ((ret = dso->meth->dso_bind_func(dso, symname)) == NULL) {
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DSOerr(DSO_F_DSO_BIND_FUNC, DSO_R_SYM_FAILURE);
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return NULL;
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}
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/* Success */
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return ret;
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}
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/*
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* I don't really like these *_ctrl functions very much to be perfectly
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* honest. For one thing, I think I have to return a negative value for any
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* error because possible DSO_ctrl() commands may return values such as
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* "size"s that can legitimately be zero (making the standard
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* "if (DSO_cmd(...))" form that works almost everywhere else fail at odd
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* times. I'd prefer "output" values to be passed by reference and the return
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* value as success/failure like usual ... but we conform when we must... :-)
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*/
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long DSO_ctrl(DSO *dso, int cmd, long larg, void *parg)
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{
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if (dso == NULL) {
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DSOerr(DSO_F_DSO_CTRL, ERR_R_PASSED_NULL_PARAMETER);
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return -1;
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}
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/*
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* We should intercept certain generic commands and only pass control to
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* the method-specific ctrl() function if it's something we don't handle.
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*/
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switch (cmd) {
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case DSO_CTRL_GET_FLAGS:
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return dso->flags;
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case DSO_CTRL_SET_FLAGS:
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dso->flags = (int)larg;
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return 0;
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case DSO_CTRL_OR_FLAGS:
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dso->flags |= (int)larg;
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return 0;
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default:
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break;
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}
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if ((dso->meth == NULL) || (dso->meth->dso_ctrl == NULL)) {
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DSOerr(DSO_F_DSO_CTRL, DSO_R_UNSUPPORTED);
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return -1;
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}
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return dso->meth->dso_ctrl(dso, cmd, larg, parg);
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}
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const char *DSO_get_filename(DSO *dso)
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{
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if (dso == NULL) {
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DSOerr(DSO_F_DSO_GET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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return dso->filename;
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}
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int DSO_set_filename(DSO *dso, const char *filename)
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{
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char *copied;
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if ((dso == NULL) || (filename == NULL)) {
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DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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return 0;
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}
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if (dso->loaded_filename) {
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DSOerr(DSO_F_DSO_SET_FILENAME, DSO_R_DSO_ALREADY_LOADED);
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return 0;
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}
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/* We'll duplicate filename */
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copied = OPENSSL_strdup(filename);
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if (copied == NULL) {
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DSOerr(DSO_F_DSO_SET_FILENAME, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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OPENSSL_free(dso->filename);
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dso->filename = copied;
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return 1;
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}
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char *DSO_merge(DSO *dso, const char *filespec1, const char *filespec2)
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{
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char *result = NULL;
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if (dso == NULL || filespec1 == NULL) {
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DSOerr(DSO_F_DSO_MERGE, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
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if (dso->merger != NULL)
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result = dso->merger(dso, filespec1, filespec2);
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else if (dso->meth->dso_merger != NULL)
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result = dso->meth->dso_merger(dso, filespec1, filespec2);
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}
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return result;
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}
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char *DSO_convert_filename(DSO *dso, const char *filename)
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{
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char *result = NULL;
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if (dso == NULL) {
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DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_PASSED_NULL_PARAMETER);
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return NULL;
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}
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if (filename == NULL)
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filename = dso->filename;
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if (filename == NULL) {
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DSOerr(DSO_F_DSO_CONVERT_FILENAME, DSO_R_NO_FILENAME);
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return NULL;
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}
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if ((dso->flags & DSO_FLAG_NO_NAME_TRANSLATION) == 0) {
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if (dso->name_converter != NULL)
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result = dso->name_converter(dso, filename);
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else if (dso->meth->dso_name_converter != NULL)
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result = dso->meth->dso_name_converter(dso, filename);
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}
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if (result == NULL) {
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result = OPENSSL_strdup(filename);
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if (result == NULL) {
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DSOerr(DSO_F_DSO_CONVERT_FILENAME, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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}
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return result;
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}
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int DSO_pathbyaddr(void *addr, char *path, int sz)
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{
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DSO_METHOD *meth = default_DSO_meth;
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if (meth == NULL)
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meth = DSO_METHOD_openssl();
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if (meth->pathbyaddr == NULL) {
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DSOerr(DSO_F_DSO_PATHBYADDR, DSO_R_UNSUPPORTED);
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return -1;
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}
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return (*meth->pathbyaddr) (addr, path, sz);
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}
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DSO *DSO_dsobyaddr(void *addr, int flags)
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{
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DSO *ret = NULL;
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char *filename = NULL;
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int len = DSO_pathbyaddr(addr, NULL, 0);
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if (len < 0)
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return NULL;
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filename = OPENSSL_malloc(len);
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if (filename != NULL
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&& DSO_pathbyaddr(addr, filename, len) == len)
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ret = DSO_load(NULL, filename, NULL, flags);
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OPENSSL_free(filename);
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return ret;
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}
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void *DSO_global_lookup(const char *name)
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{
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DSO_METHOD *meth = default_DSO_meth;
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if (meth == NULL)
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meth = DSO_METHOD_openssl();
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if (meth->globallookup == NULL) {
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DSOerr(DSO_F_DSO_GLOBAL_LOOKUP, DSO_R_UNSUPPORTED);
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return NULL;
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}
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return (*meth->globallookup) (name);
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}
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