CentOS 7.0 - man page for ssl_get_peer_cert_chain (centos section 3)
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SSL_get_peer_cert_chain(3) OpenSSL SSL_get_peer_cert_chain(3)
SSL_get_peer_cert_chain - get the X509 certificate chain of the peer
STACKOF(X509) *SSL_get_peer_cert_chain(const SSL *ssl);
SSL_get_peer_cert_chain() returns a pointer to STACKOF(X509) certificates forming the
certificate chain of the peer. If called on the client side, the stack also contains the
peer's certificate; if called on the server side, the peer's certificate must be obtained
separately using SSL_get_peer_certificate(3). If the peer did not present a certificate,
NULL is returned.
The peer certificate chain is not necessarily available after reusing a session, in which
case a NULL pointer is returned.
The reference count of the STACKOF(X509) object is not incremented. If the corresponding
session is freed, the pointer must not be used any longer.
The following return values can occur:
No certificate was presented by the peer or no connection was established or the
certificate chain is no longer available when a session is reused.
Pointer to a STACKOF(X509)
The return value points to the certificate chain presented by the peer.
1.0.1e 2013-02-11 SSL_get_peer_cert_chain(3)
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