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X509_NAME_print_ex(3) OpenSSL X509_NAME_print_ex(3)

NAME
X509_NAME_print_ex, X509_NAME_print_ex_fp, X509_NAME_print,
X509_NAME_oneline - X509_NAME printing routines.

SYNOPSIS
#include <openssl/x509.h>

int X509_NAME_print_ex(BIO *out, X509_NAME *nm, int indent, unsigned long flags);
int X509_NAME_print_ex_fp(FILE *fp, X509_NAME *nm, int indent, unsigned long flags);
char * X509_NAME_oneline(X509_NAME *a,char *buf,int size);
int X509_NAME_print(BIO *bp, X509_NAME *name, int obase);

DESCRIPTION
X509_NAME_print_ex() prints a human readable version of nm to BIO out.
Each line (for multiline formats) is indented by indent spaces. The
output format can be extensively customised by use of the flags
parameter.

X509_NAME_print_ex_fp() is identical to X509_NAME_print_ex() except the
output is written to FILE pointer fp.

X509_NAME_oneline() prints an ASCII version of a to buf. At most size
bytes will be written. If buf is NULL then a buffer is dynamically
allocated and returned, otherwise buf is returned.

X509_NAME_print() prints out name to bp indenting each line by obase
characters. Multiple lines are used if the output (including indent)
exceeds 80 characters.

NOTES
The functions X509_NAME_oneline() and X509_NAME_print() are legacy
functions which produce a non standard output form, they don't handle
multi character fields and have various quirks and inconsistencies.
Their use is strongly discouraged in new applications.

Although there are a large number of possible flags for most purposes
XN_FLAG_ONELINE, XN_FLAG_MULTILINE or XN_FLAG_RFC2253 will suffice. As
noted on the ASN1_STRING_print_ex(3) manual page for UTF8 terminals the
ASN1_STRFLGS_ESC_MSB should be unset: so for example XN_FLAG_ONELINE &
~ASN1_STRFLGS_ESC_MSB would be used.

The complete set of the flags supported by X509_NAME_print_ex() is
listed below.

Several options can be ored together.

The options XN_FLAG_SEP_COMMA_PLUS, XN_FLAG_SEP_CPLUS_SPC,
XN_FLAG_SEP_SPLUS_SPC and XN_FLAG_SEP_MULTILINE determine the field
separators to use. Two distinct separators are used between distinct
RelativeDistinguishedName components and separate values in the same
RDN for a multi-valued RDN. Multi-valued RDNs are currently very rare
so the second separator will hardly ever be used.

XN_FLAG_SEP_COMMA_PLUS uses comma and plus as separators.
XN_FLAG_SEP_CPLUS_SPC uses comma and plus with spaces: this is more
readable that plain comma and plus. XN_FLAG_SEP_SPLUS_SPC uses spaced
semicolon and plus. XN_FLAG_SEP_MULTILINE uses spaced newline and plus
respectively.

If XN_FLAG_DN_REV is set the whole DN is printed in reversed order.

The fields XN_FLAG_FN_SN, XN_FLAG_FN_LN, XN_FLAG_FN_OID,
XN_FLAG_FN_NONE determine how a field name is displayed. It will use
the short name (e.g. CN) the long name (e.g. commonName) always use OID
numerical form (normally OIDs are only used if the field name is not
recognised) and no field name respectively.

If XN_FLAG_SPC_EQ is set then spaces will be placed around the '='
character separating field names and values.

If XN_FLAG_DUMP_UNKNOWN_FIELDS is set then the encoding of unknown
fields is printed instead of the values.

If XN_FLAG_FN_ALIGN is set then field names are padded to 20
characters: this is only of use for multiline format.

Additionally all the options supported by ASN1_STRING_print_ex() can be
used to control how each field value is displayed.

In addition a number options can be set for commonly used formats.

XN_FLAG_RFC2253 sets options which produce an output compatible with
RFC2253 it is equivalent to:
ASN1_STRFLGS_RFC2253 | XN_FLAG_SEP_COMMA_PLUS | XN_FLAG_DN_REV |
XN_FLAG_FN_SN | XN_FLAG_DUMP_UNKNOWN_FIELDS

XN_FLAG_ONELINE is a more readable one line format which is the same
as:
ASN1_STRFLGS_RFC2253 | ASN1_STRFLGS_ESC_QUOTE | XN_FLAG_SEP_CPLUS_SPC
| XN_FLAG_SPC_EQ | XN_FLAG_FN_SN

XN_FLAG_COMPAT uses a format identical to X509_NAME_print(): in fact it
calls X509_NAME_print() internally.

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