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34 define a message callback function I<cb> for observing all SSL/TLS/QUIC
38 can be used to set argument I<arg> to the callback function, which is
45 object. Using a B<NULL> pointer for I<cb> disables the message callback.
47 When I<cb> is called by the SSL/TLS/QUIC library the function arguments have the
52 =item I<write_p>
57 =item I<version>
65 =item I<content_type>
74 =item I<buf>, I<len>
76 I<buf> points to a buffer containing the protocol message or other data (in the
77 case of pseudo content types), which consists of I<len> bytes. The buffer is no
80 =item I<ssl>
84 =item I<arg>
109 Due to automatic protocol version negotiation, I<version> is not
112 I<version> will be B<SSL3_VERSION>.
176 In versions previous to OpenSSL 3.0 I<cb> was called with 0 as I<version> for
179 In versions previous to OpenSSL 3.2 I<cb> was called with 0 as I<version> for