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+.Dd $Mdocdate: October 12 2014 $
+.Dt SSL_CTX_SET_MSG_CALLBACK 3
+.Os
+.Sh NAME
+.Nm SSL_CTX_set_msg_callback ,
+.Nm SSL_CTX_set_msg_callback_arg ,
+.Nm SSL_set_msg_callback ,
+.Nm SSL_get_msg_callback_arg
+.Nd install callback for observing protocol messages
+.Sh SYNOPSIS
+.In openssl/ssl.h
+.Ft void
+.Fo SSL_CTX_set_msg_callback
+.Fa "SSL_CTX *ctx"
+.Fa "void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)"
+.Fc
+.Ft void
+.Fn SSL_CTX_set_msg_callback_arg "SSL_CTX *ctx" "void *arg"
+.Ft void
+.Fo SSL_set_msg_callback
+.Fa "SSL *ssl"
+.Fa "void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg)"
+.Fc
+.Ft void
+.Fn SSL_set_msg_callback_arg "SSL *ssl" "void *arg"
+.Sh DESCRIPTION
+.Fn SSL_CTX_set_msg_callback
+or
+.Fn SSL_set_msg_callback
+can be used to define a message callback function
+.Fa cb
+for observing all SSL/TLS protocol messages (such as handshake messages)
+that are received or sent.
+.Fn SSL_CTX_set_msg_callback_arg
+and
+.Fn SSL_set_msg_callback_arg
+can be used to set argument
+.Fa arg
+to the callback function, which is available for arbitrary application use.
+.Pp
+.Fn SSL_CTX_set_msg_callback
+and
+.Fn SSL_CTX_set_msg_callback_arg
+specify default settings that will be copied to new
+.Vt SSL
+objects by
+.Xr SSL_new 3 .
+.Fn SSL_set_msg_callback
+and
+.Fn SSL_set_msg_callback_arg
+modify the actual settings of an
+.Vt SSL
+object.
+Using a
+.Dv NULL
+pointer for
+.Fa cb
+disables the message callback.
+.Pp
+When
+.Fa cb
+is called by the SSL/TLS library for a protocol message,
+the function arguments have the following meaning:
+.Bl -tag -width Ds
+.It Fa write_p
+This flag is 0 when a protocol message has been received and 1 when a protocol
+message has been sent.
+.It Fa version
+The protocol version according to which the protocol message is
+interpreted by the library.
+Currently, this is one of
+.Dv SSL2_VERSION ,
+.Dv SSL3_VERSION
+and
+.Dv TLS1_VERSION
+(for SSL 2.0, SSL 3.0 and TLS 1.0, respectively).
+.It Fa content_type
+In the case of SSL 2.0, this is always 0.
+In the case of SSL 3.0 or TLS 1.0, this is one of the
+.Em ContentType
+values defined in the protocol specification
+.Po
+.Dq change_cipher_spec(20) ,
+.Dq alert(21) ,
+.Dq handshake(22) ;
+but never
+.Dq application_data(23)
+because the callback will only be called for protocol messages.
+.Pc
+.It Fa buf , Fa len
+.Fa buf
+points to a buffer containing the protocol message, which consists of
+.Fa len
+bytes.
+The buffer is no longer valid after the callback function has returned.
+.It Fa ssl
+The
+.Vt SSL
+object that received or sent the message.
+.It Fa arg
+The user-defined argument optionally defined by
+.Fn SSL_CTX_set_msg_callback_arg
+or
+.Fn SSL_set_msg_callback_arg .
+.El
+.Sh NOTES
+Protocol messages are passed to the callback function after decryption
+and fragment collection where applicable.
+(Thus record boundaries are not visible.)
+.Pp
+If processing a received protocol message results in an error,
+the callback function may not be called.
+For example, the callback function will never see messages that are considered
+too large to be processed.
+.Pp
+Due to automatic protocol version negotiation,
+.Fa version
+is not necessarily the protocol version used by the sender of the message:
+If a TLS 1.0 ClientHello message is received by an SSL 3.0-only server,
+.Fa version
+will be
+.Dv SSL3_VERSION .
+.Sh SEE ALSO
+.Xr ssl 3 ,
+.Xr SSL_new 3
+.Sh HISTORY
+.Fn SSL_CTX_set_msg_callback ,
+.Fn SSL_CTX_set_msg_callback_arg ,
+.Fn SSL_set_msg_callback
+and
+.Fn SSL_get_msg_callback_arg
+were added in OpenSSL 0.9.7.