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.\" ========================================================================
.\"
.IX Title "X509_LOOKUP_METH_NEW 3"
.TH X509_LOOKUP_METH_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
X509_LOOKUP_METHOD, X509_LOOKUP_meth_new, X509_LOOKUP_meth_free, X509_LOOKUP_meth_set_new_item, X509_LOOKUP_meth_get_new_item, X509_LOOKUP_meth_set_free, X509_LOOKUP_meth_get_free, X509_LOOKUP_meth_set_init, X509_LOOKUP_meth_get_init, X509_LOOKUP_meth_set_shutdown, X509_LOOKUP_meth_get_shutdown, X509_LOOKUP_ctrl_fn, X509_LOOKUP_meth_set_ctrl, X509_LOOKUP_meth_get_ctrl, X509_LOOKUP_get_by_subject_fn, X509_LOOKUP_meth_set_get_by_subject, X509_LOOKUP_meth_get_get_by_subject, X509_LOOKUP_get_by_issuer_serial_fn, X509_LOOKUP_meth_set_get_by_issuer_serial, X509_LOOKUP_meth_get_get_by_issuer_serial, X509_LOOKUP_get_by_fingerprint_fn, X509_LOOKUP_meth_set_get_by_fingerprint, X509_LOOKUP_meth_get_get_by_fingerprint, X509_LOOKUP_get_by_alias_fn, X509_LOOKUP_meth_set_get_by_alias, X509_LOOKUP_meth_get_get_by_alias, X509_OBJECT_set1_X509, X509_OBJECT_set1_X509_CRL \&\- Routines to build up X509_LOOKUP methods
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509_vfy.h>
\&
\& typedef x509_lookup_method_st X509_LOOKUP_METHOD;
\&
\& X509_LOOKUP_METHOD *X509_LOOKUP_meth_new(const char *name);
\& void X509_LOOKUP_meth_free(X509_LOOKUP_METHOD *method);
\&
\& int X509_LOOKUP_meth_set_new_item(X509_LOOKUP_METHOD *method,
\&                                   int (*new_item) (X509_LOOKUP *ctx));
\& int (*X509_LOOKUP_meth_get_new_item(const X509_LOOKUP_METHOD* method))
\&     (X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_meth_set_free(X509_LOOKUP_METHOD *method,
\&                               void (*free) (X509_LOOKUP *ctx));
\& void (*X509_LOOKUP_meth_get_free(const X509_LOOKUP_METHOD* method))
\&     (X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_meth_set_init(X509_LOOKUP_METHOD *method,
\&                               int (*init) (X509_LOOKUP *ctx));
\& int (*X509_LOOKUP_meth_get_init(const X509_LOOKUP_METHOD* method))
\&     (X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_meth_set_shutdown(X509_LOOKUP_METHOD *method,
\&                                   int (*shutdown) (X509_LOOKUP *ctx));
\& int (*X509_LOOKUP_meth_get_shutdown(const X509_LOOKUP_METHOD* method))
\&     (X509_LOOKUP *ctx);
\&
\& typedef int (*X509_LOOKUP_ctrl_fn)(X509_LOOKUP *ctx, int cmd, const char *argc,
\&                                    long argl, char **ret);
\& int X509_LOOKUP_meth_set_ctrl(X509_LOOKUP_METHOD *method,
\&     X509_LOOKUP_ctrl_fn ctrl_fn);
\& X509_LOOKUP_ctrl_fn X509_LOOKUP_meth_get_ctrl(const X509_LOOKUP_METHOD *method);
\&
\& typedef int (*X509_LOOKUP_get_by_subject_fn)(X509_LOOKUP *ctx,
\&                                              X509_LOOKUP_TYPE type,
\&                                              X509_NAME *name,
\&                                              X509_OBJECT *ret);
\& int X509_LOOKUP_meth_set_get_by_subject(X509_LOOKUP_METHOD *method,
\&     X509_LOOKUP_get_by_subject_fn fn);
\& X509_LOOKUP_get_by_subject_fn X509_LOOKUP_meth_get_get_by_subject(
\&     const X509_LOOKUP_METHOD *method);
\&
\& typedef int (*X509_LOOKUP_get_by_issuer_serial_fn)(X509_LOOKUP *ctx,
\&                                                    X509_LOOKUP_TYPE type,
\&                                                    X509_NAME *name,
\&                                                    ASN1_INTEGER *serial,
\&                                                    X509_OBJECT *ret);
\& int X509_LOOKUP_meth_set_get_by_issuer_serial(
\&     X509_LOOKUP_METHOD *method, X509_LOOKUP_get_by_issuer_serial_fn fn);
\& X509_LOOKUP_get_by_issuer_serial_fn X509_LOOKUP_meth_get_get_by_issuer_serial(
\&     const X509_LOOKUP_METHOD *method);
\&
\& typedef int (*X509_LOOKUP_get_by_fingerprint_fn)(X509_LOOKUP *ctx,
\&                                                  X509_LOOKUP_TYPE type,
\&                                                  const unsigned char* bytes,
\&                                                  int len,
\&                                                  X509_OBJECT *ret);
\& int X509_LOOKUP_meth_set_get_by_fingerprint(X509_LOOKUP_METHOD *method,
\&     X509_LOOKUP_get_by_fingerprint_fn fn);
\& X509_LOOKUP_get_by_fingerprint_fn X509_LOOKUP_meth_get_get_by_fingerprint(
\&     const X509_LOOKUP_METHOD *method);
\&
\& typedef int (*X509_LOOKUP_get_by_alias_fn)(X509_LOOKUP *ctx,
\&                                            X509_LOOKUP_TYPE type,
\&                                            const char *str,
\&                                            int len,
\&                                            X509_OBJECT *ret);
\& int X509_LOOKUP_meth_set_get_by_alias(X509_LOOKUP_METHOD *method,
\&     X509_LOOKUP_get_by_alias_fn fn);
\& X509_LOOKUP_get_by_alias_fn X509_LOOKUP_meth_get_get_by_alias(
\&     const X509_LOOKUP_METHOD *method);
\&
\& int X509_OBJECT_set1_X509(X509_OBJECT *a, X509 *obj);
\& int X509_OBJECT_set1_X509_CRL(X509_OBJECT *a, X509_CRL *obj);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBX509_LOOKUP_METHOD\fR type is a structure used for the implementation of new
X509_LOOKUP types. It provides a set of functions used by OpenSSL for the
implementation of various X509 and X509_CRL lookup capabilities. One instance
of an X509_LOOKUP_METHOD can be associated to many instantiations of an
\&\fBX509_LOOKUP\fR structure.
.PP
\&\fBX509_LOOKUP_meth_new()\fR creates a new \fBX509_LOOKUP_METHOD\fR structure. It should
be given a human-readable string containing a brief description of the lookup
method.
.PP
\&\fBX509_LOOKUP_meth_free()\fR destroys a \fBX509_LOOKUP_METHOD\fR structure.
.PP
\&\fBX509_LOOKUP_get_new_item()\fR and \fBX509_LOOKUP_set_new_item()\fR get and set the
function that is called when an \fBX509_LOOKUP\fR object is created with
\&\fBX509_LOOKUP_new()\fR. If an X509_LOOKUP_METHOD requires any per\-X509_LOOKUP
specific data, the supplied new_item function should allocate this data and
invoke \fBX509_LOOKUP_set_method_data\fR\|(3).
.PP
\&\fBX509_LOOKUP_get_free()\fR and \fBX509_LOOKUP_set_free()\fR get and set the function
that is used to free any method data that was allocated and set from within
new_item function.
.PP
\&\fBX509_LOOKUP_meth_get_init()\fR and \fBX509_LOOKUP_meth_set_init()\fR get and set the
function that is used to initialize the method data that was set with
\&\fBX509_LOOKUP_set_method_data\fR\|(3) as part of the new_item routine.
.PP
\&\fBX509_LOOKUP_meth_get_shutdown()\fR and \fBX509_LOOKUP_meth_set_shutdown()\fR get and set
the function that is used to shut down the method data whose state was
previously initialized in the init function.
.PP
\&\fBX509_LOOKUP_meth_get_ctrl()\fR and \fBX509_LOOKUP_meth_set_ctrl()\fR get and set a
function to be used to handle arbitrary control commands issued by
\&\fBX509_LOOKUP_ctrl()\fR. The control function is given the X509_LOOKUP
\&\fBctx\fR, along with the arguments passed by X509_LOOKUP_ctrl. \fBcmd\fR is
an arbitrary integer that defines some operation. \fBargc\fR is a pointer
to an array of characters. \fBargl\fR is an integer. \fBret\fR, if set,
points to a location where any return data should be written to. How
\&\fBargc\fR and \fBargl\fR are used depends entirely on the control function.
.PP
\&\fBX509_LOOKUP_set_get_by_subject()\fR, \fBX509_LOOKUP_set_get_by_issuer_serial()\fR,
\&\fBX509_LOOKUP_set_get_by_fingerprint()\fR, \fBX509_LOOKUP_set_get_by_alias()\fR set
the functions used to retrieve an X509 or X509_CRL object by the object's
subject, issuer, fingerprint, and alias respectively. These functions are given
the X509_LOOKUP context, the type of the X509_OBJECT being requested, parameters
related to the lookup, and an X509_OBJECT that will receive the requested
object.
.PP
Implementations must add objects they find to the \fBX509_STORE\fR object
using \fBX509_STORE_add_cert()\fR or \fBX509_STORE_add_crl()\fR.  This increments
its reference count.  However, the \fBX509_STORE_CTX_get_by_subject()\fR
function also increases the reference count which leads to one too
many references being held.  Therefore, applications should
additionally call \fBX509_free()\fR or \fBX509_CRL_free()\fR to decrement the
reference count again.
.PP
Implementations should also use either \fBX509_OBJECT_set1_X509()\fR or
\&\fBX509_OBJECT_set1_X509_CRL()\fR to set the result.  Note that this also
increments the result's reference count.
.PP
Any method data that was created as a result of the new_item function
set by \fBX509_LOOKUP_meth_set_new_item()\fR can be accessed with
\&\fBX509_LOOKUP_get_method_data\fR\|(3). The \fBX509_STORE\fR object that owns the
X509_LOOKUP may be accessed with \fBX509_LOOKUP_get_store\fR\|(3). Successful
lookups should return 1, and unsuccessful lookups should return 0.
.PP
\&\fBX509_LOOKUP_get_get_by_subject()\fR, \fBX509_LOOKUP_get_get_by_issuer_serial()\fR,
\&\fBX509_LOOKUP_get_get_by_fingerprint()\fR, \fBX509_LOOKUP_get_get_by_alias()\fR retrieve
the function set by the corresponding setter.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The \fBX509_LOOKUP_meth_set\fR functions return 1 on success or 0 on error.
.PP
The \fBX509_LOOKUP_meth_get\fR functions return the corresponding function
pointers.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBX509_STORE_new\fR\|(3), \fBSSL_CTX_set_cert_store\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The functions described here were added in OpenSSL 1.1.0i.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2018\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
