mirror of https://github.com/openssl/openssl.git
126 lines
4.3 KiB
Plaintext
126 lines
4.3 KiB
Plaintext
=pod
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=head1 NAME
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X509_NAME_get_index_by_NID, X509_NAME_get_index_by_OBJ, X509_NAME_get_entry,
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X509_NAME_entry_count, X509_NAME_get_text_by_NID, X509_NAME_get_text_by_OBJ -
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X509_NAME lookup and enumeration functions
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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_NAME_get_index_by_NID(const X509_NAME *name, int nid, int lastpos);
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int X509_NAME_get_index_by_OBJ(const X509_NAME *name,
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const ASN1_OBJECT *obj, int lastpos);
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int X509_NAME_entry_count(const X509_NAME *name);
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X509_NAME_ENTRY *X509_NAME_get_entry(const X509_NAME *name, int loc);
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int X509_NAME_get_text_by_NID(const X509_NAME *name, int nid,
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char *buf, int len);
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int X509_NAME_get_text_by_OBJ(const X509_NAME *name, const ASN1_OBJECT *obj,
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char *buf, int len);
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=head1 DESCRIPTION
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These functions allow an B<X509_NAME> structure to be examined. The
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B<X509_NAME> structure is the same as the B<Name> type defined in
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RFC2459 (and elsewhere) and used for example in certificate subject
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and issuer names.
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X509_NAME_get_index_by_NID() and X509_NAME_get_index_by_OBJ() retrieve
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the next index matching B<nid> or B<obj> after B<lastpos>. B<lastpos>
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should initially be set to -1. If there are no more entries -1 is returned.
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If B<nid> is invalid (doesn't correspond to a valid OID) then -2 is returned.
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X509_NAME_entry_count() returns the total number of entries in B<name>.
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X509_NAME_get_entry() retrieves the B<X509_NAME_ENTRY> from B<name>
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corresponding to index B<loc>. Acceptable values for B<loc> run from
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0 to (X509_NAME_entry_count(name) - 1). The value returned is an
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internal pointer which must not be freed.
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X509_NAME_get_text_by_NID(), X509_NAME_get_text_by_OBJ() retrieve
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the "text" from the first entry in B<name> which matches B<nid> or
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B<obj>, if no such entry exists -1 is returned. At most B<len> bytes
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will be written and the text written to B<buf> will be null
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terminated. The length of the output string written is returned
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excluding the terminating null. If B<buf> is <NULL> then the amount
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of space needed in B<buf> (excluding the final null) is returned.
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=head1 NOTES
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X509_NAME_get_text_by_NID() and X509_NAME_get_text_by_OBJ() should be
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considered deprecated because they
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have various limitations which make them
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of minimal use in practice. They can only find the first matching
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entry and will copy the contents of the field verbatim: this can
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be highly confusing if the target is a multicharacter string type
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like a BMPString or a UTF8String.
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For a more general solution X509_NAME_get_index_by_NID() or
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X509_NAME_get_index_by_OBJ() should be used followed by
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X509_NAME_get_entry() on any matching indices and then the
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various B<X509_NAME_ENTRY> utility functions on the result.
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The list of all relevant B<NID_*> and B<OBJ_* codes> can be found in
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the source code header files F<< <openssl/obj_mac.h> >> and/or
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F<< <openssl/objects.h> >>.
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Applications which could pass invalid NIDs to X509_NAME_get_index_by_NID()
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should check for the return value of -2. Alternatively the NID validity
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can be determined first by checking OBJ_nid2obj(nid) is not NULL.
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=head1 RETURN VALUES
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X509_NAME_get_index_by_NID() and X509_NAME_get_index_by_OBJ()
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return the index of the next matching entry or -1 if not found.
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X509_NAME_get_index_by_NID() can also return -2 if the supplied
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NID is invalid.
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X509_NAME_entry_count() returns the total number of entries.
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X509_NAME_get_entry() returns an B<X509_NAME> pointer to the
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requested entry or B<NULL> if the index is invalid.
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=head1 EXAMPLES
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Process all entries:
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int i;
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X509_NAME_ENTRY *e;
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for (i = 0; i < X509_NAME_entry_count(nm); i++) {
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e = X509_NAME_get_entry(nm, i);
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/* Do something with e */
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}
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Process all commonName entries:
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int lastpos = -1;
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X509_NAME_ENTRY *e;
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for (;;) {
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lastpos = X509_NAME_get_index_by_NID(nm, NID_commonName, lastpos);
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if (lastpos == -1)
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break;
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e = X509_NAME_get_entry(nm, lastpos);
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/* Do something with e */
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}
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=head1 SEE ALSO
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L<ERR_get_error(3)>, L<d2i_X509_NAME(3)>
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=head1 COPYRIGHT
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Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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