SSL_shutdown返回值的研究（1）

最新推荐文章于 2025-06-23 10:13:29 发布

赵小刚

最新推荐文章于 2025-06-23 10:13:29 发布

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分类专栏：网络技术

本文链接：https://blog.youkuaiyun.com/androidzhaoxiaogang/article/details/8456632

SSL_shutdown用于关闭TLS/SSL连接，发送'close notify'告警通知对端。其返回值0表示应用已启动关闭，1表示双方已完成关闭。-1通常指示错误，需调用SSL_get_error获取具体信息。在非阻塞BIO中，可能需要多次调用以完成双向关闭。若启用静默关闭，SSL_shutdown将始终返回1，不发送'close notify'消息。

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Format

LIBS := CSSL 
#include <openssl/ssl.h>
int SSL_shutdown(SSL *ssl)

ssl
    A pointer to a token returned on the SSL_new call.

Normal return

    Return code 0 indicates that the application issued the SSL_shutdown function first. Continue issuing the SSL_shutdown function until you receive return code 1, which indicates the remote application has also shut down.
    In SSL version 3 and TLS version 1, return code 1 indicates that both the client and server applications have issued the SSL_shutdown function.
    In SSL version 2, a return code of 1 is always returned.

Error return

A return code equal to -1 indicates an error. Issue the SSL_get_error function to obtain specific information about the error.
Programming considerations

    To use this function, you must include the library specified in the prototype in your makefile.
    The SSL_shutdown function is the normal way to shut down an SSL session. It is a good idea that you shut