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Diffstat (limited to 'crypto/openssl/doc/apps/config.pod')
| -rw-r--r-- | crypto/openssl/doc/apps/config.pod | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/crypto/openssl/doc/apps/config.pod b/crypto/openssl/doc/apps/config.pod deleted file mode 100644 index ce874a42ce13..000000000000 --- a/crypto/openssl/doc/apps/config.pod +++ /dev/null @@ -1,138 +0,0 @@ - -=pod - -=head1 NAME - -config - OpenSSL CONF library configuration files - -=head1 DESCRIPTION - -The OpenSSL CONF library can be used to read configuration files. -It is used for the OpenSSL master configuration file B<openssl.cnf> -and in a few other places like B<SPKAC> files and certificate extension -files for the B<x509> utility. - -A configuration file is divided into a number of sections. Each section -starts with a line B<[ section_name ]> and ends when a new section is -started or end of file is reached. A section name can consist of -alphanumeric characters and underscores. - -The first section of a configuration file is special and is referred -to as the B<default> section this is usually unnamed and is from the -start of file until the first named section. When a name is being looked up -it is first looked up in a named section (if any) and then the -default section. - -The environment is mapped onto a section called B<ENV>. - -Comments can be included by preceding them with the B<#> character - -Each section in a configuration file consists of a number of name and -value pairs of the form B<name=value> - -The B<name> string can contain any alphanumeric characters as well as -a few punctuation symbols such as B<.> B<,> B<;> and B<_>. - -The B<value> string consists of the string following the B<=> character -until end of line with any leading and trailing white space removed. - -The value string undergoes variable expansion. This can be done by -including the form B<$var> or B<${var}>: this will substitute the value -of the named variable in the current section. It is also possible to -substitute a value from another section using the syntax B<$section::name> -or B<${section::name}>. By using the form B<$ENV::name> environment -variables can be substituted. It is also possible to assign values to -environment variables by using the name B<ENV::name>, this will work -if the program looks up environment variables using the B<CONF> library -instead of calling B<getenv()> directly. - -It is possible to escape certain characters by using any kind of quote -or the B<\> character. By making the last character of a line a B<\> -a B<value> string can be spread across multiple lines. In addition -the sequences B<\n>, B<\r>, B<\b> and B<\t> are recognized. - -=head1 NOTES - -If a configuration file attempts to expand a variable that doesn't exist -then an error is flagged and the file will not load. This can happen -if an attempt is made to expand an environment variable that doesn't -exist. For example the default OpenSSL master configuration file used -the value of B<HOME> which may not be defined on non Unix systems. - -This can be worked around by including a B<default> section to provide -a default value: then if the environment lookup fails the default value -will be used instead. For this to work properly the default value must -be defined earlier in the configuration file than the expansion. See -the B<EXAMPLES> section for an example of how to do this. - -If the same variable exists in the same section then all but the last -value will be silently ignored. In certain circumstances such as with -DNs the same field may occur multiple times. This is usually worked -around by ignoring any characters before an initial B<.> e.g. - - 1.OU="My first OU" - 2.OU="My Second OU" - -=head1 EXAMPLES - -Here is a sample configuration file using some of the features -mentioned above. - - # This is the default section. - - HOME=/temp - RANDFILE= ${ENV::HOME}/.rnd - configdir=$ENV::HOME/config - - [ section_one ] - - # We are now in section one. - - # Quotes permit leading and trailing whitespace - any = " any variable name " - - other = A string that can \ - cover several lines \ - by including \\ characters - - message = Hello World\n - - [ section_two ] - - greeting = $section_one::message - -This next example shows how to expand environment variables safely. - -Suppose you want a variable called B<tmpfile> to refer to a -temporary filename. The directory it is placed in can determined by -the the B<TEMP> or B<TMP> environment variables but they may not be -set to any value at all. If you just include the environment variable -names and the variable doesn't exist then this will cause an error when -an attempt is made to load the configuration file. By making use of the -default section both values can be looked up with B<TEMP> taking -priority and B</tmp> used if neither is defined: - - TMP=/tmp - # The above value is used if TMP isn't in the environment - TEMP=$ENV::TMP - # The above value is used if TEMP isn't in the environment - tmpfile=${ENV::TEMP}/tmp.filename - -=head1 BUGS - -Currently there is no way to include characters using the octal B<\nnn> -form. Strings are all null terminated so nulls cannot form part of -the value. - -The escaping isn't quite right: if you want to use sequences like B<\n> -you can't use any quote escaping on the same line. - -Files are loaded in a single pass. This means that an variable expansion -will only work if the variables referenced are defined earlier in the -file. - -=head1 SEE ALSO - -L<x509(1)|x509(1)>, L<req(1)|req(1)>, L<ca(1)|ca(1)> - -=cut |