#include <openssl/ssl.h> void SSL_set_connect_state(SSL *ssl); void SSL_set_accept_state(SSL *ssl); int SSL_is_server(const SSL *ssl);
SSL_set_accept_state() sets ssl to work in server mode.
SSL_is_server() checks if ssl is working in server mode.
When beginning a new handshake, the SSL engine must know whether it must call the connect (client) or accept (server) routines. Even though it may be clear from the method chosen, whether client or server mode was requested, the handshake routines must be explicitly set.
When using the SSL_connect(3) or SSL_accept(3) routines, the correct handshake routines are automatically set. When performing a transparent negotiation using SSL_write_ex(3), SSL_write(3), SSL_read_ex(3), or SSL_read(3), the handshake routines must be explicitly set in advance using either SSL_set_connect_state() or SSL_set_accept_state().
If SSL_is_server() is called before SSL_set_connect_state() or SSL_set_accept_state() is called (either automatically or explicitly), the result depends on what method was used when SSL_CTX was created with SSL_CTX_new(3). If a generic method or a dedicated server method was passed to SSL_CTX_new(3), SSL_is_server() returns 1; otherwise, it returns 0.
SSL_is_server() returns 1 if ssl is working in server mode or 0 for client mode.
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.