= nng_tls_config_ca_chain(3tls)
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//
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// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_tls_config_ca_chain - configure certificate authority certificate chain
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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#include <nng/supplemental/tls/tls.h>
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int nng_tls_config_ca_chain(nng_tls_config *cfg, const char *chain, const char *crl);
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----
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== DESCRIPTION
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The `nng_tls_config_ca_chain()` function configures a certificate or
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((certificate chain)) to be used when validating peers using the configuration
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_cfg_.
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NOTE: Certificates *must* be configured when using the authentication mode
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`NNG_TLS_AUTH_MODE_REQUIRED`.
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TIP: This function may be called multiple times, to add additional chains
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to a configuration, without affecting those added previously.
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The certificates located in _chain_ must be a zero-terminated C string in
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https://tools.ietf.org/html/rfc7468[PEM] format.
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Multiple certificates may appear concatenated together,
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with the leaf certificate listed first.
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The _crl_ may be `NULL`, or may also be a C string containing a PEM format
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((certificate revocation list)) for the associated authority.
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== RETURN VALUES
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This function returns 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_ENOMEM`:: Insufficient memory is available.
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`NNG_EBUSY`:: The configuration _cfg_ is already in use, and cannot be modified.
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`NNG_EINVAL`:: An invalid _chain_ or _crl_ was supplied.
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== SEE ALSO
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[.text-left]
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng_tls_config_alloc.3tls.adoc[nng_tls_config_alloc(.3tls)],
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xref:nng_tls_config_auth_mode.3tls.adoc[nng_tls_config_auth_mode(.3tls)],
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xref:nng_tls_config_ca_file.3tls.adoc[nng_tls_config_ca_file(.3tls)],
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xref:nng.7.adoc[nng(7)]
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