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SSL_COMP_get_id.3
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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_COMP_add_compression_method, SSL_COMP_get_compression_methods, SSL_COMP_get0_name, SSL_COMP_get_id, SSL_COMP_free_compression_methods \&\- handle SSL/TLS integrated compression methods .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm); \& STACK_OF(SSL_COMP) *SSL_COMP_get_compression_methods(void); \& const char *SSL_COMP_get0_name(const SSL_COMP *comp); \& int SSL_COMP_get_id(const SSL_COMP *comp); .Ve .PP Deprecated: .PP .Vb 3 \& #if OPENSSL_API_COMPAT < 0x10100000L \& void SSL_COMP_free_compression_methods(void) \& #endif .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_COMP_add_compression_method()\fR adds the compression method \fBcm\fR with the identifier \fBid\fR to the list of available compression methods. This list is globally maintained for all \s-1SSL\s0 operations within this application. It cannot be set for specific \s-1SSL_CTX\s0 or \s-1SSL\s0 objects. .PP \&\fBSSL_COMP_get_compression_methods()\fR returns a stack of all of the available compression methods or \s-1NULL\s0 on error. .PP \&\fBSSL_COMP_get0_name()\fR returns the name of the compression method \fBcomp\fR. .PP \&\fBSSL_COMP_get_id()\fR returns the id of the compression method \fBcomp\fR. .PP \&\fBSSL_COMP_free_compression_methods()\fR releases any resources acquired to maintain the internal table of compression methods. .SH "NOTES" .IX Header "NOTES" The \s-1TLS\s0 standard (or SSLv3) allows the integration of compression methods into the communication. The \s-1TLS RFC\s0 does however not specify compression methods or their corresponding identifiers, so there is currently no compatible way to integrate compression with unknown peers. It is therefore currently not recommended to integrate compression into applications. Applications for non-public use may agree on certain compression methods. Using different compression methods with the same identifier will lead to connection failure. .PP An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1) will unconditionally send the list of all compression methods enabled with \&\fBSSL_COMP_add_compression_method()\fR to the server during the handshake. Unlike the mechanisms to set a cipher list, there is no method available to restrict the list of compression method on a per connection basis. .PP An OpenSSL server will match the identifiers listed by a client against its own compression methods and will unconditionally activate compression when a matching identifier is found. There is no way to restrict the list of compression methods supported on a per connection basis. .PP If enabled during compilation, the OpenSSL library will have the \&\fBCOMP_zlib()\fR compression method available. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_COMP_add_compression_method()\fR may return the following values: .IP "0" 4 The operation succeeded. .IP "1" 4 .IX Item "1" The operation failed. Check the error queue to find out the reason. .PP \&\fBSSL_COMP_get_compression_methods()\fR returns the stack of compressions methods or \&\s-1NULL\s0 on error. .PP \&\fBSSL_COMP_get0_name()\fR returns the name of the compression method or \s-1NULL\s0 on error. .PP \&\fBSSL_COMP_get_id()\fR returns the name of the compression method or \-1 on error. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(7) .SH "HISTORY" .IX Header "HISTORY" The \fBSSL_COMP_free_compression_methods()\fR function was deprecated in OpenSSL 1.1.0. The \fBSSL_COMP_get0_name()\fR and \fBSSL_comp_get_id()\fR functions were added in OpenSSL 1.1.0d. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2001\-2016 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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