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+.\" ======================================================================
+.\"
+.IX Title "SSL_CTX_set_msg_callback 3"
+.TH SSL_CTX_set_msg_callback 3 "0.9.7" "2003-01-13" "OpenSSL"
+.UC
+.SH "NAME"
+SSL_CTX_set_msg_callback, SSL_CTX_set_msg_callback_arg, SSL_set_msg_callback, SSL_get_msg_callback_arg \- install callback for observing protocol messages
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 2
+\& void SSL_CTX_set_msg_callback(SSL_CTX *ctx, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg));
+\& void SSL_CTX_set_msg_callback_arg(SSL_CTX *ctx, void *arg);
+.Ve
+.Vb 2
+\& void SSL_set_msg_callback(SSL_CTX *ctx, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg));
+\& void SSL_set_msg_callback_arg(SSL_CTX *ctx, void *arg);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_set_msg_callback()\fR or \fISSL_set_msg_callback()\fR can be used to
+define a message callback function \fIcb\fR for observing all \s-1SSL/TLS\s0
+protocol messages (such as handshake messages) that are received or
+sent.  \fISSL_CTX_set_msg_callback_arg()\fR and \fISSL_set_msg_callback_arg()\fR
+can be used to set argument \fIarg\fR to the callback function, which is
+available for arbitrary application use.
+.PP
+\&\fISSL_CTX_set_msg_callback()\fR and \fISSL_CTX_set_msg_callback_arg()\fR specify
+default settings that will be copied to new \fB\s-1SSL\s0\fR objects by
+SSL_new(3). \fISSL_set_msg_callback()\fR and
+\&\fISSL_set_msg_callback_arg()\fR modify the actual settings of an \fB\s-1SSL\s0\fR
+object. Using a \fB0\fR pointer for \fIcb\fR disables the message callback.
+.PP
+When \fIcb\fR is called by the \s-1SSL/TLS\s0 library for a protocol message,
+the function arguments have the following meaning:
+.Ip "\fIwrite_p\fR" 4
+.IX Item "write_p"
+This flag is \fB0\fR when a protocol message has been received and \fB1\fR
+when a protocol message has been sent.
+.Ip "\fIversion\fR" 4
+.IX Item "version"
+The protocol version according to which the protocol message is
+interpreted by the library. Currently, this is one of
+\&\fB\s-1SSL2_VERSION\s0\fR, \fB\s-1SSL3_VERSION\s0\fR and \fB\s-1TLS1_VERSION\s0\fR (for \s-1SSL\s0 2.0, \s-1SSL\s0
+3.0 and \s-1TLS\s0 1.0, respectively).
+.Ip "\fIcontent_type\fR" 4
+.IX Item "content_type"
+In the case of \s-1SSL\s0 2.0, this is always \fB0\fR.  In the case of \s-1SSL\s0 3.0
+or \s-1TLS\s0 1.0, this is one of the \fBContentType\fR values defined in the
+protocol specification (\fBchange_cipher_spec(20)\fR, \fBalert(21)\fR,
+\&\fBhandshake(22)\fR; but never \fBapplication_data(23)\fR because the
+callback will only be called for protocol messages).
+.Ip "\fIbuf\fR, \fIlen\fR" 4
+.IX Item "buf, len"
+\&\fIbuf\fR points to a buffer containing the protocol message, which
+consists of \fIlen\fR bytes. The buffer is no longer valid after the
+callback function has returned.
+.Ip "\fIssl\fR" 4
+.IX Item "ssl"
+The \fB\s-1SSL\s0\fR object that received or sent the message.
+.Ip "\fIarg\fR" 4
+.IX Item "arg"
+The user-defined argument optionally defined by
+\&\fISSL_CTX_set_msg_callback_arg()\fR or \fISSL_set_msg_callback_arg()\fR.
+.SH "NOTES"
+.IX Header "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, \fIversion\fR is not
+necessarily the protocol version used by the sender of the message: If
+a \s-1TLS\s0 1.0 ClientHello message is received by an \s-1SSL\s0 3.0\-only server,
+\&\fIversion\fR will be \fB\s-1SSL3_VERSION\s0\fR.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3), SSL_new(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fISSL_CTX_set_msg_callback()\fR, \fISSL_CTX_set_msg_callback_arg()\fR,
+\&\fISSL_set_msg_callback()\fR and \fISSL_get_msg_callback_arg()\fR were added in OpenSSL 0.9.7.