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文件: /usr/local/src/openssl-1.1.1w/doc/man3/SSL_new.pod
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=pod =head1 NAME SSL_dup, SSL_new, SSL_up_ref - create an SSL structure for a connection =head1 SYNOPSIS #include <openssl/ssl.h> SSL *SSL_dup(SSL *s); SSL *SSL_new(SSL_CTX *ctx); int SSL_up_ref(SSL *s); =head1 DESCRIPTION SSL_new() creates a new B<SSL> structure which is needed to hold the data for a TLS/SSL connection. The new structure inherits the settings of the underlying context B<ctx>: connection method, options, verification settings, timeout settings. An B<SSL> structure is reference counted. Creating an B<SSL> structure for the first time increments the reference count. Freeing it (using SSL_free) decrements it. When the reference count drops to zero, any memory or resources allocated to the B<SSL> structure are freed. SSL_up_ref() increments the reference count for an existing B<SSL> structure. The function SSL_dup() creates and returns a new B<SSL> structure from the same B<SSL_CTX> that was used to create I<s>. It additionally duplicates a subset of the settings in I<s> into the new B<SSL> object. For SSL_dup() to work, the connection MUST be in its initial state and MUST NOT have yet started the SSL handshake. For connections that are not in their initial state SSL_dup() just increments an internal reference count and returns the I<same> handle. It may be possible to use L<SSL_clear(3)> to recycle an SSL handle that is not in its initial state for re-use, but this is best avoided. Instead, save and restore the session, if desired, and construct a fresh handle for each connection. The subset of settings in I<s> that are duplicated are: =over 4 =item any session data if configured (including the session_id_context) =item any tmp_dh settings set via L<SSL_set_tmp_dh(3)>, L<SSL_set_tmp_dh_callback(3)>, or L<SSL_set_dh_auto(3)> =item any configured certificates, private keys or certificate chains =item any configured signature algorithms, or client signature algorithms =item any DANE settings =item any Options set via L<SSL_set_options(3)> =item any Mode set via L<SSL_set_mode(3)> =item any minimum or maximum protocol settings set via L<SSL_set_min_proto_version(3)> or L<SSL_set_max_proto_version(3)> (Note: Only from OpenSSL 1.1.1h and above) =item any Verify mode, callback or depth set via L<SSL_set_verify(3)> or L<SSL_set_verify_depth(3)> or any configured X509 verification parameters =item any msg callback or info callback set via L<SSL_set_msg_callback(3)> or L<SSL_set_info_callback(3)> =item any default password callback set via L<SSL_set_default_passwd_cb(3)> =item any session id generation callback set via L<SSL_set_generate_session_id(3)> =item any configured Cipher List =item initial accept (server) or connect (client) state =item the max cert list value set via L<SSL_set_max_cert_list(3)> =item the read_ahead value set via L<SSL_set_read_ahead(3)> =item application specific data set via L<SSL_set_ex_data(3)> =item any CA list or client CA list set via L<SSL_set0_CA_list(3)>, SSL_set0_client_CA_list() or similar functions =item any security level settings or callbacks =item any configured serverinfo data =item any configured PSK identity hint =item any configured custom extensions =item any client certificate types configured via SSL_set1_client_certificate_types =back =head1 RETURN VALUES The following return values can occur: =over 4 =item NULL The creation of a new SSL structure failed. Check the error stack to find out the reason. =item Pointer to an SSL structure The return value points to an allocated SSL structure. SSL_up_ref() returns 1 for success and 0 for failure. =back =head1 SEE ALSO L<SSL_free(3)>, L<SSL_clear(3)>, L<SSL_CTX_set_options(3)>, L<SSL_get_SSL_CTX(3)>, L<ssl(7)> =head1 COPYRIGHT Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. 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 L<https://www.openssl.org/source/license.html>. =cut
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