#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);
#if OPENSSL_API_COMPAT < 0x10100000L void SSL_COMP_free_compression_methods(void) #endif
SSL_COMP_get_compression_methods() returns a stack of all of the available compression methods or NULL on error.
SSL_COMP_get0_name() returns the name of the compression method comp.
SSL_COMP_get_id() returns the id of the compression method comp.
SSL_COMP_free_compression_methods() releases any resources acquired to maintain the internal table of compression methods.
An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1) will unconditionally send the list of all compression methods enabled with SSL_COMP_add_compression_method() 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.
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.
If enabled during compilation, the OpenSSL library will have the COMP_zlib() compression method available.
- The operation succeeded.
- The operation failed. Check the error queue to find out the reason.
SSL_COMP_get_compression_methods() returns the stack of compressions methods or NULL on error.
SSL_COMP_get0_name() returns the name of the compression method or NULL on error.
SSL_COMP_get_id() returns the name of the compression method or -1 on error.
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.