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=head1 NAME

ossl_cmp_log_parse_metadata,
ossl_cmp_add_error_txt,
ossl_cmp_add_error_data,
ossl_cmp_add_error_line,
ossl_cmp_asn1_octet_string_set1,
ossl_cmp_asn1_octet_string_set1_bytes,
ossl_cmp_build_cert_chain
- misc internal utility functions

=head1 SYNOPSIS

 #include "cmp_int.h"

 const char *ossl_cmp_log_parse_metadata(const char *buf,
                                         OSSL_CMP_severity *level, char **func,
                                         char **file, int *line);

 void ossl_cmp_add_error_txt(const char *separator, const char *txt);
 #define ossl_cmp_add_error_data(txt)
 #define ossl_cmp_add_error_line(txt)

 int ossl_cmp_asn1_octet_string_set1(ASN1_OCTET_STRING **tgt,
                                     const ASN1_OCTET_STRING *src);
 int ossl_cmp_asn1_octet_string_set1_bytes(ASN1_OCTET_STRING **tgt,
                                           const unsigned char *bytes, int len);

 STACK_OF(X509) *ossl_cmp_build_cert_chain(STACK_OF(X509) *certs, X509 *cert);

=head1 DESCRIPTION

ossl_cmp_log_parse_metadata() parses the given message buffer C<buf> populated
by L<OSSL_CMP_log()> etc.
according to the pattern OSSL_CMP_LOG_START#level ": %s\n", filling in
the variable pointed to by C<level> with the severity level or -1,
the variable pointed to by C<func> with the function name string or NULL,
the variable pointed to by C<file> with the file name string or NULL, and
the variable pointed to by C<line> with the line number or -1.
Any string returned via C<*func> and C<*file> must be freeed by the caller.

ossl_cmp_add_error_txt() appends text to the extra data field of the last
error message in the OpenSSL error queue, after adding the optional separator
unless data has been empty so far. The text can be of arbitrary length,
which is not possible when using L<ERR_add_error_data(3)> in conjunction with
L<ERR_print_errors_cb(3)>.

ossl_cmp_add_error_data() is a macro calling
B<ossl_cmp_add_error_txt()> with the separator being ":".

ossl_cmp_add_error_line() is a macro calling
B<ossl_cmp_add_error_txt()> with the separator being "\n".

ossl_cmp_asn1_octet_string_set1() frees any previous value of the variable
referenced via the C<tgt> argument and assigns either a copy of
the ASN1_OCTET_STRING given as the C<src> argument or C<NULL>.
It returns 1 on success, 0 on error.

ossl_cmp_asn1_octet_string_set1_bytes() frees any previous value of the variable
referenced via the C<tgt> argument and assigns either a copy of the given byte
string (with the given length) or NULL. It returns 1 on success, 0 on error.

ossl_cmp_build_cert_chain() builds up the certificate chain of cert as high up
as possible using the given X509_STORE containing all possible intermediate
certificates and optionally the (possible) trust anchor(s).

=head1 RETURN VALUES

ossl_cmp_log_parse_metadata() returns the pointer to the actual message text
after the OSSL_CMP_LOG_PREFIX and level and ':' if found in the buffer,
else the beginning of the buffer.

ossl_cmp_add_error_txt()
ossl_cmp_add_error_data(), and
ossl_cmp_add_error_line()
do not return anything.

ossl_cmp_build_cert_chain()
returns NULL on error, else a pointer to a stack of (up_ref'ed) certificates
containing the EE certificate given in the function arguments (cert)
and all intermediate certificates up the chain toward the trust anchor.
The (self-signed) trust anchor is not included.

All other functions return 1 on success, 0 on error.

=head1 HISTORY

The OpenSSL CMP support was added in OpenSSL 3.0.

=head1 COPYRIGHT

Copyright 2007-2019 The OpenSSL Project Authors. All Rights Reserved.

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
L<https://www.openssl.org/source/license.html>.

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