OpenSSL取消引用指向不完整类型的指针 [英] OpenSSL dereferencing pointer to incomplete type

问题描述

我正在使用OpenSSL库.我正在尝试访问struct engine_st的rsa_meth属性.这样做的代码如下:

I am working with OpenSSL library. I am trying to access rsa_meth attribute of struct engine_st. The code for doing is as follows:

ctx-> client_cert_engine-> rsa_meth

ctx->client_cert_engine->rsa_meth

其中ctx的类型为SSL_CTX *.

where ctx is of type SSL_CTX *.

我尝试包括所有必要的头文件，但仍然可以给我:

I tried to include all the necessary header files but still it is giving me:

dereferencing pointer to incomplete type.

尽管，如果我删除了rsa_meth，它就可以正常工作.

Although, if I remove rsa_meth then it works fine.

推荐答案

engine_st(这是client_cert_engine的意思)是一个内部结构定义(位于crypto/engine/eng_int.h中)，并且未在公共标头中公开. (可能)这是为了防止在结构发生更改时出现二进制兼容性问题.与其尝试取消引用，不如使用engine.h标头中定义的getter:

engine_st (which is what client_cert_engine is) is an internal struct definition (it's in crypto/engine/eng_int.h) and is not exposed in the public header. This is (probably) to prevent a binary compatibility issue in the event of a change to the struct. Instead of trying to dereference, use the getters defined in the engine.h header:

 const char *ENGINE_get_id(const ENGINE *e);
 const char *ENGINE_get_name(const ENGINE *e);
 const RSA_METHOD *ENGINE_get_RSA(const ENGINE *e);
 const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e);
 const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e);
 const ECDSA_METHOD *ENGINE_get_ECDSA(const ENGINE *e);
 const DH_METHOD *ENGINE_get_DH(const ENGINE *e);
 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e);
 const STORE_METHOD *ENGINE_get_STORE(const ENGINE *e);

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