a528d4f0a9
If something was "present in all versions" of SSLeay, or if it was added to a version of SSLeay (and therefore predates OpenSSL), remove mention of it. Documentation history now starts with OpenSSL. Remove mention of all history before OpenSSL 0.9.8, inclusive. Remove all AUTHOR sections. Reviewed-by: Tim Hudson <tjh@openssl.org>
133 lines
4.6 KiB
Text
133 lines
4.6 KiB
Text
=pod
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=head1 NAME
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CONF_modules_load_file, CONF_modules_load - OpenSSL configuration functions
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=head1 SYNOPSIS
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#include <openssl/conf.h>
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int CONF_modules_load_file(const char *filename, const char *appname,
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unsigned long flags);
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int CONF_modules_load(const CONF *cnf, const char *appname,
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unsigned long flags);
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=head1 DESCRIPTION
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The function CONF_modules_load_file() configures OpenSSL using file
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B<filename> and application name B<appname>. If B<filename> is NULL
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the standard OpenSSL configuration file is used. If B<appname> is
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NULL the standard OpenSSL application name B<openssl_conf> is used.
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The behaviour can be customized using B<flags>.
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CONF_modules_load() is identical to CONF_modules_load_file() except it
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reads configuration information from B<cnf>.
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=head1 NOTES
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The following B<flags> are currently recognized:
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B<CONF_MFLAGS_IGNORE_ERRORS> if set errors returned by individual
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configuration modules are ignored. If not set the first module error is
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considered fatal and no further modules are loaded.
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Normally any modules errors will add error information to the error queue. If
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B<CONF_MFLAGS_SILENT> is set no error information is added.
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If B<CONF_MFLAGS_NO_DSO> is set configuration module loading from DSOs is
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disabled.
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B<CONF_MFLAGS_IGNORE_MISSING_FILE> if set will make CONF_load_modules_file()
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ignore missing configuration files. Normally a missing configuration file
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return an error.
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B<CONF_MFLAGS_DEFAULT_SECTION> if set and B<appname> is not NULL will use the
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default section pointed to by B<openssl_conf> if B<appname> does not exist.
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Applications should call these functions after loading builtin modules using
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OPENSSL_load_builtin_modules(), any ENGINEs for example using
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ENGINE_load_builtin_engines(), any algorithms for example
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OPENSSL_add_all_algorithms() and (if the application uses libssl)
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SSL_library_init().
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By using CONF_modules_load_file() with appropriate flags an application can
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customise application configuration to best suit its needs. In some cases the
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use of a configuration file is optional and its absence is not an error: in
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this case B<CONF_MFLAGS_IGNORE_MISSING_FILE> would be set.
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Errors during configuration may also be handled differently by different
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applications. For example in some cases an error may simply print out a warning
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message and the application continue. In other cases an application might
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consider a configuration file error as fatal and exit immediately.
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Applications can use the CONF_modules_load() function if they wish to load a
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configuration file themselves and have finer control over how errors are
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treated.
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=head1 EXAMPLES
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Load a configuration file and print out any errors and exit (missing file
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considered fatal):
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if (CONF_modules_load_file(NULL, NULL, 0) <= 0) {
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fprintf(stderr, "FATAL: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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Load default configuration file using the section indicated by "myapp",
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tolerate missing files, but exit on other errors:
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if (CONF_modules_load_file(NULL, "myapp",
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CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
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fprintf(stderr, "FATAL: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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exit(1);
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}
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Load custom configuration file and section, only print warnings on error,
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missing configuration file ignored:
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if (CONF_modules_load_file("/something/app.cnf", "myapp",
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CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
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fprintf(stderr, "WARNING: error loading configuration file\n");
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ERR_print_errors_fp(stderr);
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}
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Load and parse configuration file manually, custom error handling:
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FILE *fp;
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CONF *cnf = NULL;
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long eline;
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fp = fopen("/somepath/app.cnf", "r");
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if (fp == NULL) {
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fprintf(stderr, "Error opening configuration file\n");
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/* Other missing configuration file behaviour */
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} else {
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cnf = NCONF_new(NULL);
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if (NCONF_load_fp(cnf, fp, &eline) == 0) {
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fprintf(stderr, "Error on line %ld of configuration file\n", eline);
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ERR_print_errors_fp(stderr);
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/* Other malformed configuration file behaviour */
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} else if (CONF_modules_load(cnf, "appname", 0) <= 0) {
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fprintf(stderr, "Error configuring application\n");
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ERR_print_errors_fp(stderr);
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/* Other configuration error behaviour */
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}
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fclose(fp);
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NCONF_free(cnf);
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}
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=head1 RETURN VALUES
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These functions return 1 for success and a zero or negative value for
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failure. If module errors are not ignored the return code will reflect the
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return value of the failing module (this will always be zero or negative).
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=head1 SEE ALSO
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L<conf(5)>, L<OPENSSL_config(3)>,
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L<CONF_free(3)>, L<err(3)>
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=cut
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