SSL_CTX_add_extra_chain_cert manpage

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SSL_CTX_add_extra_chain_cert(3)	    OpenSSL    SSL_CTX_add_extra_chain_cert(3)

       SSL_CTX_add_extra_chain_cert, SSL_CTX_clear_extra_chain_certs - add or
       clear extra chain certificates

	#include <openssl/ssl.h>

	long SSL_CTX_add_extra_chain_cert(SSL_CTX *ctx, X509 *x509);
	long SSL_CTX_clear_extra_chain_certs(SSL_CTX *ctx);

       SSL_CTX_add_extra_chain_cert() adds the certificate x509 to the extra
       chain certificates associated with ctx. Several certificates can be
       added one after another.

       SSL_CTX_clear_extra_chain_certs() clears all extra chain certificates
       associated with ctx.

       These functions are implemented as macros.

       When sending a certificate chain, extra chain certificates are sent in
       order following the end entity certificate.

       If no chain is specified, the library will try to complete the chain
       from the available CA certificates in the trusted CA storage, see

       The x509 certificate provided to SSL_CTX_add_extra_chain_cert() will be
       freed by the library when the SSL_CTX is destroyed. An application
       should not free the x509 object.

       Only one set of extra chain certificates can be specified per SSL_CTX
       structure. Different chains for different certificates (for example if
       both RSA and DSA certificates are specified by the same server) or
       different SSL structures with the same parent SSL_CTX cannot be
       specified using this function. For more flexibility functions such as
       SSL_add1_chain_cert() should be used instead.

       SSL_CTX_add_extra_chain_cert() and SSL_CTX_clear_extra_chain_certs()
       return 1 on success and 0 for failure. Check out the error stack to
       find out the reason for failure.

       ssl(3), SSL_CTX_use_certificate(3), SSL_CTX_set_client_cert_cb(3),
       SSL_CTX_load_verify_locations(3) SSL_CTX_set0_chain(3)
       SSL_CTX_set1_chain(3) SSL_CTX_add0_chain_cert(3)
       SSL_CTX_add1_chain_cert(3) SSL_set0_chain(3) SSL_set1_chain(3)
       SSL_add0_chain_cert(3) SSL_add1_chain_cert(3)
       SSL_CTX_build_cert_chain(3) SSL_build_cert_chain(3)

1.0.2k				  2017-01-26   SSL_CTX_add_extra_chain_cert(3)