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SSL_dup.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_dup, SSL_new, SSL_up_ref \- create an SSL structure for a connection .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& SSL *SSL_dup(SSL *s); \& SSL *SSL_new(SSL_CTX *ctx); \& int SSL_up_ref(SSL *s); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_new()\fR creates a new \fB\s-1SSL\s0\fR structure which is needed to hold the data for a \s-1TLS/SSL\s0 connection. The new structure inherits the settings of the underlying context \fBctx\fR: connection method, options, verification settings, timeout settings. An \fB\s-1SSL\s0\fR structure is reference counted. Creating an \fB\s-1SSL\s0\fR 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 \fB\s-1SSL\s0\fR structure are freed. .PP \&\fBSSL_up_ref()\fR increments the reference count for an existing \fB\s-1SSL\s0\fR structure. .PP The function \fBSSL_dup()\fR creates and returns a new \fB\s-1SSL\s0\fR structure from the same \&\fB\s-1SSL_CTX\s0\fR that was used to create \fIs\fR. It additionally duplicates a subset of the settings in \fIs\fR into the new \fB\s-1SSL\s0\fR object. .PP For \fBSSL_dup()\fR to work, the connection \s-1MUST\s0 be in its initial state and \&\s-1MUST NOT\s0 have yet started the \s-1SSL\s0 handshake. For connections that are not in their initial state \fBSSL_dup()\fR just increments an internal reference count and returns the \fIsame\fR handle. It may be possible to use \fBSSL_clear\fR\|(3) to recycle an \s-1SSL\s0 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. .PP The subset of settings in \fIs\fR that are duplicated are: .IP "any session data if configured (including the session_id_context)" 4 .IX Item "any session data if configured (including the session_id_context)" .PD 0 .IP "any tmp_dh settings set via \fBSSL_set_tmp_dh\fR\|(3), \fBSSL_set_tmp_dh_callback\fR\|(3), or \fBSSL_set_dh_auto\fR\|(3)" 4 .IX Item "any tmp_dh settings set via SSL_set_tmp_dh, SSL_set_tmp_dh_callback, or SSL_set_dh_auto" .IP "any configured certificates, private keys or certificate chains" 4 .IX Item "any configured certificates, private keys or certificate chains" .IP "any configured signature algorithms, or client signature algorithms" 4 .IX Item "any configured signature algorithms, or client signature algorithms" .IP "any \s-1DANE\s0 settings" 4 .IX Item "any DANE settings" .IP "any Options set via \fBSSL_set_options\fR\|(3)" 4 .IX Item "any Options set via SSL_set_options" .IP "any Mode set via \fBSSL_set_mode\fR\|(3)" 4 .IX Item "any Mode set via SSL_set_mode" .IP "any minimum or maximum protocol settings set via \fBSSL_set_min_proto_version\fR\|(3) or \fBSSL_set_max_proto_version\fR\|(3) (Note: Only from OpenSSL 1.1.1h and above)" 4 .IX Item "any minimum or maximum protocol settings set via SSL_set_min_proto_version or SSL_set_max_proto_version (Note: Only from OpenSSL 1.1.1h and above)" .IP "any Verify mode, callback or depth set via \fBSSL_set_verify\fR\|(3) or \fBSSL_set_verify_depth\fR\|(3) or any configured X509 verification parameters" 4 .IX Item "any Verify mode, callback or depth set via SSL_set_verify or SSL_set_verify_depth or any configured X509 verification parameters" .IP "any msg callback or info callback set via \fBSSL_set_msg_callback\fR\|(3) or \fBSSL_set_info_callback\fR\|(3)" 4 .IX Item "any msg callback or info callback set via SSL_set_msg_callback or SSL_set_info_callback" .IP "any default password callback set via \fBSSL_set_default_passwd_cb\fR\|(3)" 4 .IX Item "any default password callback set via SSL_set_default_passwd_cb" .IP "any session id generation callback set via \fBSSL_set_generate_session_id\fR\|(3)" 4 .IX Item "any session id generation callback set via SSL_set_generate_session_id" .IP "any configured Cipher List" 4 .IX Item "any configured Cipher List" .IP "initial accept (server) or connect (client) state" 4 .IX Item "initial accept (server) or connect (client) state" .IP "the max cert list value set via \fBSSL_set_max_cert_list\fR\|(3)" 4 .IX Item "the max cert list value set via SSL_set_max_cert_list" .IP "the read_ahead value set via \fBSSL_set_read_ahead\fR\|(3)" 4 .IX Item "the read_ahead value set via SSL_set_read_ahead" .IP "application specific data set via \fBSSL_set_ex_data\fR\|(3)" 4 .IX Item "application specific data set via SSL_set_ex_data" .IP "any \s-1CA\s0 list or client \s-1CA\s0 list set via \fBSSL_set0_CA_list\fR\|(3), \fBSSL_set0_client_CA_list()\fR or similar functions" 4 .IX Item "any CA list or client CA list set via SSL_set0_CA_list, SSL_set0_client_CA_list() or similar functions" .IP "any security level settings or callbacks" 4 .IX Item "any security level settings or callbacks" .IP "any configured serverinfo data" 4 .IX Item "any configured serverinfo data" .IP "any configured \s-1PSK\s0 identity hint" 4 .IX Item "any configured PSK identity hint" .IP "any configured custom extensions" 4 .IX Item "any configured custom extensions" .IP "any client certificate types configured via SSL_set1_client_certificate_types" 4 .IX Item "any client certificate types configured via SSL_set1_client_certificate_types" .PD .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following return values can occur: .IP "\s-1NULL\s0" 4 .IX Item "NULL" The creation of a new \s-1SSL\s0 structure failed. Check the error stack to find out the reason. .IP "Pointer to an \s-1SSL\s0 structure" 4 .IX Item "Pointer to an SSL structure" The return value points to an allocated \s-1SSL\s0 structure. .Sp \&\fBSSL_up_ref()\fR returns 1 for success and 0 for failure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBSSL_free\fR\|(3), \fBSSL_clear\fR\|(3), \&\fBSSL_CTX_set_options\fR\|(3), \&\fBSSL_get_SSL_CTX\fR\|(3), \&\fBssl\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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