287 lines
9.6 KiB
Groff
287 lines
9.6 KiB
Groff
.\" $NetBSD: SSL_CTX_set_info_callback.3,v 1.6 2003/07/24 14:16:44 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_CTX_set_info_callback 3"
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.TH SSL_CTX_set_info_callback 3 "0.9.7b" "2001-11-10" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_CTX_set_info_callback, SSL_CTX_get_info_callback, SSL_set_info_callback, SSL_get_info_callback \- handle information callback for \s-1SSL\s0 connections
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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.Ve
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.Vb 2
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\& void SSL_CTX_set_info_callback(SSL_CTX *ctx, void (*callback)());
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\& void (*SSL_CTX_get_info_callback(SSL_CTX *ctx))();
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.Ve
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.Vb 2
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\& void SSL_set_info_callback(SSL *ssl, void (*callback)());
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\& void (*SSL_get_info_callback(SSL *ssl))();
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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_info_callback()\fR sets the \fBcallback\fR function, that can be used to
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obtain state information for \s-1SSL\s0 objects created from \fBctx\fR during connection
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setup and use. The setting for \fBctx\fR is overridden from the setting for
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a specific \s-1SSL\s0 object, if specified.
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When \fBcallback\fR is \s-1NULL\s0, not callback function is used.
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.PP
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\&\fISSL_set_info_callback()\fR sets the \fBcallback\fR function, that can be used to
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obtain state information for \fBssl\fR during connection setup and use.
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When \fBcallback\fR is \s-1NULL\s0, the callback setting currently valid for
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\&\fBctx\fR is used.
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.PP
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\&\fISSL_CTX_get_info_callback()\fR returns a pointer to the currently set information
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callback function for \fBctx\fR.
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.PP
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\&\fISSL_get_info_callback()\fR returns a pointer to the currently set information
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callback function for \fBssl\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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When setting up a connection and during use, it is possible to obtain state
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information from the \s-1SSL/TLS\s0 engine. When set, an information callback function
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is called whenever the state changes, an alert appears, or an error occurs.
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.PP
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The callback function is called as \fBcallback(\s-1SSL\s0 *ssl, int where, int ret)\fR.
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The \fBwhere\fR argument specifies information about where (in which context)
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the callback function was called. If \fBret\fR is 0, an error condition occurred.
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If an alert is handled, \s-1SSL_CB_ALERT\s0 is set and \fBret\fR specifies the alert
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information.
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.PP
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\&\fBwhere\fR is a bitmask made up of the following bits:
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.Ip "\s-1SSL_CB_LOOP\s0" 4
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.IX Item "SSL_CB_LOOP"
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Callback has been called to indicate state change inside a loop.
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.Ip "\s-1SSL_CB_EXIT\s0" 4
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.IX Item "SSL_CB_EXIT"
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Callback has been called to indicate error exit of a handshake function.
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(May be soft error with retry option for non-blocking setups.)
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.Ip "\s-1SSL_CB_READ\s0" 4
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.IX Item "SSL_CB_READ"
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Callback has been called during read operation.
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.Ip "\s-1SSL_CB_WRITE\s0" 4
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.IX Item "SSL_CB_WRITE"
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Callback has been called during write operation.
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.Ip "\s-1SSL_CB_ALERT\s0" 4
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.IX Item "SSL_CB_ALERT"
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Callback has been called due to an alert being sent or received.
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.Ip "\s-1SSL_CB_READ_ALERT\s0 (SSL_CB_ALERT|SSL_CB_READ)" 4
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.IX Item "SSL_CB_READ_ALERT (SSL_CB_ALERT|SSL_CB_READ)"
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.Ip "\s-1SSL_CB_WRITE_ALERT\s0 (SSL_CB_ALERT|SSL_CB_WRITE)" 4
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.IX Item "SSL_CB_WRITE_ALERT (SSL_CB_ALERT|SSL_CB_WRITE)"
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.Ip "\s-1SSL_CB_ACCEPT_LOOP\s0 (SSL_ST_ACCEPT|SSL_CB_LOOP)" 4
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.IX Item "SSL_CB_ACCEPT_LOOP (SSL_ST_ACCEPT|SSL_CB_LOOP)"
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.Ip "\s-1SSL_CB_ACCEPT_EXIT\s0 (SSL_ST_ACCEPT|SSL_CB_EXIT)" 4
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.IX Item "SSL_CB_ACCEPT_EXIT (SSL_ST_ACCEPT|SSL_CB_EXIT)"
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.Ip "\s-1SSL_CB_CONNECT_LOOP\s0 (SSL_ST_CONNECT|SSL_CB_LOOP)" 4
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.IX Item "SSL_CB_CONNECT_LOOP (SSL_ST_CONNECT|SSL_CB_LOOP)"
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.Ip "\s-1SSL_CB_CONNECT_EXIT\s0 (SSL_ST_CONNECT|SSL_CB_EXIT)" 4
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.IX Item "SSL_CB_CONNECT_EXIT (SSL_ST_CONNECT|SSL_CB_EXIT)"
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.Ip "\s-1SSL_CB_HANDSHAKE_START\s0" 4
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.IX Item "SSL_CB_HANDSHAKE_START"
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Callback has been called because a new handshake is started.
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.Ip "\s-1SSL_CB_HANDSHAKE_DONE\s0 0x20" 4
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.IX Item "SSL_CB_HANDSHAKE_DONE 0x20"
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Callback has been called because a handshake is finished.
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.PP
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The current state information can be obtained using the
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SSL_state_string(3) family of functions.
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.PP
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The \fBret\fR information can be evaluated using the
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SSL_alert_type_string(3) family of functions.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_set_info_callback()\fR does not provide diagnostic information.
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.PP
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\&\fISSL_get_info_callback()\fR returns the current setting.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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The following example callback function prints state strings, information
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about alerts being handled and error messages to the \fBbio_err\fR \s-1BIO\s0.
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.PP
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.Vb 4
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\& void apps_ssl_info_callback(SSL *s, int where, int ret)
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\& {
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\& const char *str;
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\& int w;
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.Ve
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.Vb 1
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\& w=where& ~SSL_ST_MASK;
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.Ve
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.Vb 3
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\& if (w & SSL_ST_CONNECT) str="SSL_connect";
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\& else if (w & SSL_ST_ACCEPT) str="SSL_accept";
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\& else str="undefined";
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.Ve
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.Vb 24
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\& if (where & SSL_CB_LOOP)
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\& {
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\& BIO_printf(bio_err,"%s:%s\en",str,SSL_state_string_long(s));
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\& }
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\& else if (where & SSL_CB_ALERT)
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\& {
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\& str=(where & SSL_CB_READ)?"read":"write";
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\& BIO_printf(bio_err,"SSL3 alert %s:%s:%s\en",
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\& str,
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\& SSL_alert_type_string_long(ret),
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\& SSL_alert_desc_string_long(ret));
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\& }
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\& else if (where & SSL_CB_EXIT)
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\& {
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\& if (ret == 0)
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\& BIO_printf(bio_err,"%s:failed in %s\en",
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\& str,SSL_state_string_long(s));
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\& else if (ret < 0)
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\& {
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\& BIO_printf(bio_err,"%s:error in %s\en",
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\& str,SSL_state_string_long(s));
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\& }
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\& }
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\& }
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3), SSL_state_string(3),
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SSL_alert_type_string(3)
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