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.IX Title "X509V3_EXT_PRINT 3ossl"
.TH X509V3_EXT_PRINT 3ossl 2026-04-07 3.5.6 OpenSSL
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.SH NAME
X509V3_EXT_print, X509V3_EXT_print_fp \- pretty print X509 certificate extensions
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509v3.h>
\&
\& int X509V3_EXT_print(BIO *out, X509_EXTENSION *ext, unsigned long flag, int indent);
\& int X509V3_EXT_print_fp(FILE *out, X509_EXTENSION *ext, int flag, int indent);
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\fBX509V3_EXT_print()\fR and \fBX509V3_EXT_print_fp()\fR parse and print the extension
info from \fIext\fR to \fIbio\fR or \fIout\fR with indentation set via \fIindent\fR.
\&\fIflag\fR determines the behaviour if an extension could not be parsed and can be
one of:
\&\fBX509V3_EXT_DEFAULT\fR (equivalent to 0): an unknown or unparsable extension
stops the parsing and the function returns a failure.
\&\fBX509V3_EXT_PARSE_UNKNOWN\fR: an unknown or unparsable extension is handled by
printing it through the \fBASN1_parse_dump()\fR function, and the function returns
success.
\&\fBX509V3_EXT_DUMP_UNKNOWN\fR: an unknown or unparsable extension is handled by
printing it through the \fBBIO_dump_indent()\fR function, and the function returns
success,
\&\fBX509V3_EXT_ERROR_UNKNOWN\fR: an unknown or unparsable extension is handled by
printing either "<Not Supported>" or  "<Parse Error>", and the function returns
success.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBX509V3_EXT_print()\fR and \fBX509V3_EXT_print_fp()\fR return 1 for success and 0 for
failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBBIO_dump_indent\fR\|(3),
\&\fBASN1_parse_dump\fR\|(3),
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2026 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the "License").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file LICENSE in the source distribution or at
<https://www.openssl.org/source/license.html>.