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133 .\" ========================================================================
135 .IX Title "OPENSSL_CONFIG 3"
136 .TH OPENSSL_CONFIG 3 "2021-02-16" "1.1.1j" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 OPENSSL_config, OPENSSL_no_config \- simple OpenSSL configuration functions
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/conf.h>
148 \& #if OPENSSL_API_COMPAT < 0x10100000L
149 \& void OPENSSL_config(const char *appname);
150 \& void OPENSSL_no_config(void);
154 .IX Header "DESCRIPTION"
155 \&\fBOPENSSL_config()\fR configures OpenSSL using the standard \fBopenssl.cnf\fR and
156 reads from the application section \fBappname\fR. If \fBappname\fR is \s-1NULL\s0 then
157 the default section, \fBopenssl_conf\fR, will be used.
158 Errors are silently ignored.
159 Multiple calls have no effect.
161 \&\fBOPENSSL_no_config()\fR disables configuration. If called before \fBOPENSSL_config()\fR
162 no configuration takes place.
164 If the application is built with \fB\s-1OPENSSL_LOAD_CONF\s0\fR defined, then a
165 call to \fBOpenSSL_add_all_algorithms()\fR will implicitly call \fBOPENSSL_config()\fR
169 The \fBOPENSSL_config()\fR function is designed to be a very simple \*(L"call it and
170 forget it\*(R" function.
171 It is however \fBmuch\fR better than nothing. Applications which need finer
172 control over their configuration functionality should use the configuration
173 functions such as \fBCONF_modules_load()\fR directly. This function is deprecated
174 and its use should be avoided.
175 Applications should instead call \fBCONF_modules_load()\fR during
176 initialization (that is before starting any threads).
178 There are several reasons why calling the OpenSSL configuration routines is
179 advisable. For example, to load dynamic ENGINEs from shared libraries (DSOs).
180 However, very few applications currently support the control interface and so
181 very few can load and use dynamic ENGINEs. Equally in future more sophisticated
182 ENGINEs will require certain control operations to customize them. If an
183 application calls \fBOPENSSL_config()\fR it doesn't need to know or care about
184 \&\s-1ENGINE\s0 control operations because they can be performed by editing a
187 .IX Header "ENVIRONMENT"
188 .IP "\fB\s-1OPENSSL_CONF\s0\fR" 4
189 .IX Item "OPENSSL_CONF"
190 The path to the config file.
191 Ignored in set-user-ID and set-group-ID programs.
193 .IX Header "RETURN VALUES"
194 Neither \fBOPENSSL_config()\fR nor \fBOPENSSL_no_config()\fR return a value.
196 .IX Header "SEE ALSO"
198 \&\fBCONF_modules_load_file\fR\|(3)
201 The \fBOPENSSL_no_config()\fR and \fBOPENSSL_config()\fR functions were
202 deprecated in OpenSSL 1.1.0 by \fBOPENSSL_init_crypto()\fR.
204 .IX Header "COPYRIGHT"
205 Copyright 2004\-2020 The OpenSSL Project Authors. All Rights Reserved.
207 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
208 this file except in compliance with the License. You can obtain a copy
209 in the file \s-1LICENSE\s0 in the source distribution or at
210 <https://www.openssl.org/source/license.html>.