from small one page howto to huge articles all in one place
 

search text in:





Poll
Which screen resolution do you use?










poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

108841

userrating:

average rating: 1.7 (85 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

222930

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

103189

userrating:

average rating: 1.3 (28 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





CONF_modules_load_file

Section: OpenSSL (3)
Updated: 2017-05-25
Index Return to Main Contents
 

NAME

 CONF_modules_load_file, CONF_modules_load - OpenSSL configuration functions

 

SYNOPSIS

 #include <openssl/conf.h>

 int CONF_modules_load_file(const char *filename, const char *appname,
                                        unsigned long flags);
 int CONF_modules_load(const CONF *cnf, const char *appname,
                               unsigned long flags);

 

DESCRIPTION

The function CONF_modules_load_file() configures OpenSSL using file filename and application name appname. If filename is NULL the standard OpenSSL configuration file is used. If appname is NULL the standard OpenSSL application name openssl_conf is used. The behaviour can be cutomized using flags.

CONF_modules_load() is idential to CONF_modules_load_file() except it reads configuration information from cnf.  

NOTES

The following flags are currently recognized:

CONF_MFLAGS_IGNORE_ERRORS if set errors returned by individual configuration modules are ignored. If not set the first module error is considered fatal and no further modules are loaded.

Normally any modules errors will add error information to the error queue. If CONF_MFLAGS_SILENT is set no error information is added.

If CONF_MFLAGS_NO_DSO is set configuration module loading from DSOs is disabled.

CONF_MFLAGS_IGNORE_MISSING_FILE if set will make CONF_load_modules_file() ignore missing configuration files. Normally a missing configuration file return an error.

CONF_MFLAGS_DEFAULT_SECTION if set and appname is not NULL will use the default section pointed to by openssl_conf if appname does not exist.

Applications should call these functions after loading builtin modules using OPENSSL_load_builtin_modules(), any ENGINEs for example using ENGINE_load_builtin_engines(), any algorithms for example OPENSSL_add_all_algorithms() and (if the application uses libssl) SSL_library_init().

By using CONF_modules_load_file() with appropriate flags an application can customise application configuration to best suit its needs. In some cases the use of a configuration file is optional and its absence is not an error: in this case CONF_MFLAGS_IGNORE_MISSING_FILE would be set.

Errors during configuration may also be handled differently by different applications. For example in some cases an error may simply print out a warning message and the application continue. In other cases an application might consider a configuration file error as fatal and exit immediately.

Applications can use the CONF_modules_load() function if they wish to load a configuration file themselves and have finer control over how errors are treated.  

EXAMPLES

Load a configuration file and print out any errors and exit (missing file considered fatal):

 if (CONF_modules_load_file(NULL, NULL, 0) <= 0) {
    fprintf(stderr, "FATAL: error loading configuration file\n");
    ERR_print_errors_fp(stderr);
    exit(1);
 }

Load default configuration file using the section indicated by ``myapp'', tolerate missing files, but exit on other errors:

 if (CONF_modules_load_file(NULL, "myapp",
                            CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
    fprintf(stderr, "FATAL: error loading configuration file\n");
    ERR_print_errors_fp(stderr);
    exit(1);
 }

Load custom configuration file and section, only print warnings on error, missing configuration file ignored:

 if (CONF_modules_load_file("/something/app.cnf", "myapp",
                            CONF_MFLAGS_IGNORE_MISSING_FILE) <= 0) {
    fprintf(stderr, "WARNING: error loading configuration file\n");
    ERR_print_errors_fp(stderr);
 }

Load and parse configuration file manually, custom error handling:

 FILE *fp;
 CONF *cnf = NULL;
 long eline;
 fp = fopen("/somepath/app.cnf", "r");
 if (fp == NULL) {
    fprintf(stderr, "Error opening configuration file\n");
    /* Other missing configuration file behaviour */
 } else {
    cnf = NCONF_new(NULL);
    if (NCONF_load_fp(cnf, fp, &eline) == 0) {
        fprintf(stderr, "Error on line %ld of configuration file\n", eline);
        ERR_print_errors_fp(stderr);
        /* Other malformed configuration file behaviour */
    } else if (CONF_modules_load(cnf, "appname", 0) <= 0) {
      fprintf(stderr, "Error configuring application\n");
      ERR_print_errors_fp(stderr);
      /* Other configuration error behaviour */
    }
    fclose(fp);
    NCONF_free(cnf);
  }

 

RETURN VALUES

These functions return 1 for success and a zero or negative value for failure. If module errors are not ignored the return code will reflect the return value of the failing module (this will always be zero or negative).  

SEE ALSO

conf(5), OPENSSL_config(3), CONF_free(3), err(3)  

HISTORY

CONF_modules_load_file and CONF_modules_load first appeared in OpenSSL 0.9.7.


 

Index

NAME
SYNOPSIS
DESCRIPTION
NOTES
EXAMPLES
RETURN VALUES
SEE ALSO
HISTORY


Please read "Why adblockers are bad".



Other free services
toURL.org
Shorten long
URLs to short
links like
http://tourl.org/2
tourl.org
.
Reverse DNS lookup
Find out which hostname(s)
resolve to a
given IP or other hostnames for the server
www.reversednslookup.org
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2017 Sascha Nitsch Unternehmensberatung UG(haftungsbeschränkt)
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 3.1 ms