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