222 lines
7.8 KiB
Groff
222 lines
7.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SSL_CTX_set_msg_callback 3"
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.TH SSL_CTX_set_msg_callback 3 "2015-06-11" "1.0.1n" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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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
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& 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));
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\& void SSL_CTX_set_msg_callback_arg(SSL_CTX *ctx, void *arg);
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\&
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\& void SSL_set_msg_callback(SSL *ssl, void (*cb)(int write_p, int version, int content_type, const void *buf, size_t len, SSL *ssl, void *arg));
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\& void SSL_set_msg_callback_arg(SSL *ssl, void *arg);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_CTX_set_msg_callback()\fR or \fISSL_set_msg_callback()\fR can be used to
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define a message callback function \fIcb\fR for observing all \s-1SSL/TLS\s0
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protocol messages (such as handshake messages) that are received or
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sent. \fISSL_CTX_set_msg_callback_arg()\fR and \fISSL_set_msg_callback_arg()\fR
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can be used to set argument \fIarg\fR to the callback function, which is
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available for arbitrary application use.
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.PP
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\&\fISSL_CTX_set_msg_callback()\fR and \fISSL_CTX_set_msg_callback_arg()\fR specify
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default settings that will be copied to new \fB\s-1SSL\s0\fR objects by
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\&\fISSL_new\fR\|(3). \fISSL_set_msg_callback()\fR and
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\&\fISSL_set_msg_callback_arg()\fR modify the actual settings of an \fB\s-1SSL\s0\fR
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object. Using a \fB0\fR pointer for \fIcb\fR disables the message callback.
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.PP
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When \fIcb\fR is called by the \s-1SSL/TLS\s0 library for a protocol message,
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the function arguments have the following meaning:
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.IP "\fIwrite_p\fR" 4
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.IX Item "write_p"
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This flag is \fB0\fR when a protocol message has been received and \fB1\fR
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when a protocol message has been sent.
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.IP "\fIversion\fR" 4
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.IX Item "version"
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The protocol version according to which the protocol message is
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interpreted by the library. Currently, this is one of
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\&\fB\s-1SSL2_VERSION\s0\fR, \fB\s-1SSL3_VERSION\s0\fR and \fB\s-1TLS1_VERSION\s0\fR (for \s-1SSL 2.0, SSL
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3.0\s0 and \s-1TLS 1.0,\s0 respectively).
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.IP "\fIcontent_type\fR" 4
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.IX Item "content_type"
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In the case of \s-1SSL 2.0,\s0 this is always \fB0\fR. In the case of \s-1SSL 3.0\s0
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or \s-1TLS 1.0,\s0 this is one of the \fBContentType\fR values defined in the
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protocol specification (\fBchange_cipher_spec(20)\fR, \fBalert(21)\fR,
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\&\fBhandshake(22)\fR; but never \fBapplication_data(23)\fR because the
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callback will only be called for protocol messages).
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.IP "\fIbuf\fR, \fIlen\fR" 4
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.IX Item "buf, len"
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\&\fIbuf\fR points to a buffer containing the protocol message, which
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consists of \fIlen\fR bytes. The buffer is no longer valid after the
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callback function has returned.
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.IP "\fIssl\fR" 4
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.IX Item "ssl"
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The \fB\s-1SSL\s0\fR object that received or sent the message.
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.IP "\fIarg\fR" 4
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.IX Item "arg"
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The user-defined argument optionally defined by
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\&\fISSL_CTX_set_msg_callback_arg()\fR or \fISSL_set_msg_callback_arg()\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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Protocol messages are passed to the callback function after decryption
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and fragment collection where applicable. (Thus record boundaries are
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not visible.)
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.PP
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If processing a received protocol message results in an error,
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the callback function may not be called. For example, the callback
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function will never see messages that are considered too large to be
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processed.
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.PP
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Due to automatic protocol version negotiation, \fIversion\fR is not
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necessarily the protocol version used by the sender of the message: If
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a \s-1TLS 1.0\s0 ClientHello message is received by an \s-1SSL 3\s0.0\-only server,
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\&\fIversion\fR will be \fB\s-1SSL3_VERSION\s0\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(3), \fISSL_new\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fISSL_CTX_set_msg_callback()\fR, \fISSL_CTX_set_msg_callback_arg()\fR,
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\&\fISSL_set_msg_callback()\fR and \fISSL_get_msg_callback_arg()\fR were added in OpenSSL 0.9.7.
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