220 lines
7.3 KiB
Groff
220 lines
7.3 KiB
Groff
.\" $NetBSD: OPENSSL_config.3,v 1.1 2004/03/20 21:48:46 groo Exp $
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.\" Sat Mar 20 16:41:01 2004
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.\" ======================================================================
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.\"
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.IX Title "OPENSSL_config 3"
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.TH OPENSSL_config 3 "0.9.7d" "2004-03-19" "OpenSSL"
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.UC
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.SH "NAME"
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OPENSSL_config, OPENSSL_no_config \- simple OpenSSL configuration functions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/conf.h>
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.Ve
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.Vb 2
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\& void OPENSSL_config(const char *config_name);
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\& void OPENSSL_no_config(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIOPENSSL_config()\fR configures OpenSSL using the standard \fBopenssl.cnf\fR
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configuration file name using \fBconfig_name\fR. If \fBconfig_name\fR is \s-1NULL\s0 then
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the default name \fBopenssl_conf\fR will be used. Any errors are ignored. Further
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calls to \fIOPENSSL_config()\fR will have no effect. The configuration file format
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is documented in the conf(5) manual page.
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.PP
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\&\fIOPENSSL_no_config()\fR disables configuration. If called before \fIOPENSSL_config()\fR
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no configuration takes place.
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.SH "NOTES"
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.IX Header "NOTES"
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It is \fBstrongly\fR recommended that \fBall\fR new applications call \fIOPENSSL_config()\fR
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or the more sophisticated functions such as \fICONF_modules_load()\fR during
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initialization (that is before starting any threads). By doing this
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an application does not need to keep track of all configuration options
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and some new functionality can be supported automatically.
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.PP
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It is also possible to automatically call \fIOPENSSL_config()\fR when an application
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calls \fIOPENSSL_add_all_algorithms()\fR by compiling an application with the
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preprocessor symbol \fB\s-1OPENSSL_LOAD_CONF\s0\fR #define'd. In this way configuration
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can be added without source changes.
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.PP
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The environment variable \fB\s-1OPENSSL_CONFIG\s0\fR can be set to specify the location
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of the configuration file.
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.PP
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Currently \s-1ASN1\s0 OBJECTs and \s-1ENGINE\s0 configuration can be performed future
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versions of OpenSSL will add new configuration options.
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.PP
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There are several reasons why calling the OpenSSL configuration routines is
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advisable. For example new \s-1ENGINE\s0 functionality was added to OpenSSL 0.9.7.
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In OpenSSL 0.9.7 control functions can be supported by ENGINEs, this can be
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used (among other things) to load dynamic ENGINEs from shared libraries (DSOs).
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However very few applications currently support the control interface and so
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very few can load and use dynamic ENGINEs. Equally in future more sophisticated
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ENGINEs will require certain control operations to customize them. If an
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application calls \fIOPENSSL_config()\fR it doesn't need to know or care about
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\&\s-1ENGINE\s0 control operations because they can be performed by editing a
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configuration file.
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.PP
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Applications should free up configuration at application closedown by calling
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\&\fICONF_modules_free()\fR.
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.SH "RESTRICTIONS"
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.IX Header "RESTRICTIONS"
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The \fIOPENSSL_config()\fR function is designed to be a very simple \*(L"call it and
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forget it\*(R" function. As a result its behaviour is somewhat limited. It ignores
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all errors silently and it can only load from the standard configuration file
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location for example.
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.PP
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It is however \fBmuch\fR better than nothing. Applications which need finer
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control over their configuration functionality should use the configuration
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functions such as \fICONF_load_modules()\fR directly.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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Neither \fIOPENSSL_config()\fR nor \fIOPENSSL_no_config()\fR return a value.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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conf(5), CONF_load_modules_file(3),
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\&\fICONF_modules_free\fR\|(3),CONF_modules_free(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIOPENSSL_config()\fR and \fIOPENSSL_no_config()\fR first appeared in OpenSSL 0.9.7
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