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124.\" ========================================================================
125.\"
126.IX Title "SSL_CTX_set_info_callback 3"
127.TH SSL_CTX_set_info_callback 3 "2011-02-08" "1.0.0d" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
132.SH "NAME"
133SSL_CTX_set_info_callback, SSL_CTX_get_info_callback, SSL_set_info_callback, SSL_get_info_callback \- handle information callback for SSL connections
134.SH "SYNOPSIS"
135.IX Header "SYNOPSIS"
136.Vb 1
137\& #include <openssl/ssl.h>
138\&
139\& void SSL_CTX_set_info_callback(SSL_CTX *ctx, void (*callback)());
140\& void (*SSL_CTX_get_info_callback(const SSL_CTX *ctx))();
141\&
142\& void SSL_set_info_callback(SSL *ssl, void (*callback)());
143\& void (*SSL_get_info_callback(const SSL *ssl))();
144.Ve
145.SH "DESCRIPTION"
146.IX Header "DESCRIPTION"
147\&\fISSL_CTX_set_info_callback()\fR sets the \fBcallback\fR function, that can be used to
148obtain state information for \s-1SSL\s0 objects created from \fBctx\fR during connection
149setup and use. The setting for \fBctx\fR is overridden from the setting for
150a specific \s-1SSL\s0 object, if specified.
151When \fBcallback\fR is \s-1NULL\s0, not callback function is used.
152.PP
153\&\fISSL_set_info_callback()\fR sets the \fBcallback\fR function, that can be used to
154obtain state information for \fBssl\fR during connection setup and use.
155When \fBcallback\fR is \s-1NULL\s0, the callback setting currently valid for
156\&\fBctx\fR is used.
157.PP
158\&\fISSL_CTX_get_info_callback()\fR returns a pointer to the currently set information
159callback function for \fBctx\fR.
160.PP
161\&\fISSL_get_info_callback()\fR returns a pointer to the currently set information
162callback function for \fBssl\fR.
163.SH "NOTES"
164.IX Header "NOTES"
165When setting up a connection and during use, it is possible to obtain state
166information from the \s-1SSL/TLS\s0 engine. When set, an information callback function
167is called whenever the state changes, an alert appears, or an error occurs.
168.PP
169The callback function is called as \fBcallback(\s-1SSL\s0 *ssl, int where, int ret)\fR.
170The \fBwhere\fR argument specifies information about where (in which context)
171the callback function was called. If \fBret\fR is 0, an error condition occurred.
172If an alert is handled, \s-1SSL_CB_ALERT\s0 is set and \fBret\fR specifies the alert
173information.
174.PP
175\&\fBwhere\fR is a bitmask made up of the following bits:
176.IP "\s-1SSL_CB_LOOP\s0" 4
177.IX Item "SSL_CB_LOOP"
178Callback has been called to indicate state change inside a loop.
179.IP "\s-1SSL_CB_EXIT\s0" 4
180.IX Item "SSL_CB_EXIT"
181Callback has been called to indicate error exit of a handshake function.
182(May be soft error with retry option for non-blocking setups.)
183.IP "\s-1SSL_CB_READ\s0" 4
184.IX Item "SSL_CB_READ"
185Callback has been called during read operation.
186.IP "\s-1SSL_CB_WRITE\s0" 4
187.IX Item "SSL_CB_WRITE"
188Callback has been called during write operation.
189.IP "\s-1SSL_CB_ALERT\s0" 4
190.IX Item "SSL_CB_ALERT"
191Callback has been called due to an alert being sent or received.
192.IP "\s-1SSL_CB_READ_ALERT\s0 (SSL_CB_ALERT|SSL_CB_READ)" 4
193.IX Item "SSL_CB_READ_ALERT (SSL_CB_ALERT|SSL_CB_READ)"
194.PD 0
195.IP "\s-1SSL_CB_WRITE_ALERT\s0 (SSL_CB_ALERT|SSL_CB_WRITE)" 4
196.IX Item "SSL_CB_WRITE_ALERT (SSL_CB_ALERT|SSL_CB_WRITE)"
197.IP "\s-1SSL_CB_ACCEPT_LOOP\s0 (SSL_ST_ACCEPT|SSL_CB_LOOP)" 4
198.IX Item "SSL_CB_ACCEPT_LOOP (SSL_ST_ACCEPT|SSL_CB_LOOP)"
199.IP "\s-1SSL_CB_ACCEPT_EXIT\s0 (SSL_ST_ACCEPT|SSL_CB_EXIT)" 4
200.IX Item "SSL_CB_ACCEPT_EXIT (SSL_ST_ACCEPT|SSL_CB_EXIT)"
201.IP "\s-1SSL_CB_CONNECT_LOOP\s0 (SSL_ST_CONNECT|SSL_CB_LOOP)" 4
202.IX Item "SSL_CB_CONNECT_LOOP (SSL_ST_CONNECT|SSL_CB_LOOP)"
203.IP "\s-1SSL_CB_CONNECT_EXIT\s0 (SSL_ST_CONNECT|SSL_CB_EXIT)" 4
204.IX Item "SSL_CB_CONNECT_EXIT (SSL_ST_CONNECT|SSL_CB_EXIT)"
205.IP "\s-1SSL_CB_HANDSHAKE_START\s0" 4
206.IX Item "SSL_CB_HANDSHAKE_START"
207.PD
208Callback has been called because a new handshake is started.
209.IP "\s-1SSL_CB_HANDSHAKE_DONE\s0 0x20" 4
210.IX Item "SSL_CB_HANDSHAKE_DONE 0x20"
211Callback has been called because a handshake is finished.
212.PP
213The current state information can be obtained using the
214\&\fISSL_state_string\fR\|(3) family of functions.
215.PP
216The \fBret\fR information can be evaluated using the
217\&\fISSL_alert_type_string\fR\|(3) family of functions.
218.SH "RETURN VALUES"
219.IX Header "RETURN VALUES"
220\&\fISSL_set_info_callback()\fR does not provide diagnostic information.
221.PP
222\&\fISSL_get_info_callback()\fR returns the current setting.
223.SH "EXAMPLES"
224.IX Header "EXAMPLES"
225The following example callback function prints state strings, information
226about alerts being handled and error messages to the \fBbio_err\fR \s-1BIO\s0.
227.PP
228.Vb 4
229\& void apps_ssl_info_callback(SSL *s, int where, int ret)
230\& {
231\& const char *str;
232\& int w;
233\&
234\& w=where& ~SSL_ST_MASK;
235\&
236\& if (w & SSL_ST_CONNECT) str="SSL_connect";
237\& else if (w & SSL_ST_ACCEPT) str="SSL_accept";
238\& else str="undefined";
239\&
240\& if (where & SSL_CB_LOOP)
241\& {
242\& BIO_printf(bio_err,"%s:%s\en",str,SSL_state_string_long(s));
243\& }
244\& else if (where & SSL_CB_ALERT)
245\& {
246\& str=(where & SSL_CB_READ)?"read":"write";
247\& BIO_printf(bio_err,"SSL3 alert %s:%s:%s\en",
248\& str,
249\& SSL_alert_type_string_long(ret),
250\& SSL_alert_desc_string_long(ret));
251\& }
252\& else if (where & SSL_CB_EXIT)
253\& {
254\& if (ret == 0)
255\& BIO_printf(bio_err,"%s:failed in %s\en",
256\& str,SSL_state_string_long(s));
257\& else if (ret < 0)
258\& {
259\& BIO_printf(bio_err,"%s:error in %s\en",
260\& str,SSL_state_string_long(s));
261\& }
262\& }
263\& }
264.Ve
265.SH "SEE ALSO"
266.IX Header "SEE ALSO"
267\&\fIssl\fR\|(3), \fISSL_state_string\fR\|(3),
268\&\fISSL_alert_type_string\fR\|(3)
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