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Title "SSL_CTX_set_info_callback 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_CTX_set_info_callback, SSL_CTX_get_info_callback, SSL_set_info_callback, SSL_get_info_callback - handle information callback for SSL connections Header "SYNOPSIS" .Vb 1 #include <openssl/ssl.h> \& void SSL_CTX_set_info_callback(SSL_CTX *ctx, void (*callback)()); void (*SSL_CTX_get_info_callback(const SSL_CTX *ctx))(); \& void SSL_set_info_callback(SSL *ssl, void (*callback)()); void (*SSL_get_info_callback(const SSL *ssl))(); .Ve Header "DESCRIPTION" \fISSL_CTX_set_info_callback() sets the callback function, that can be used to obtain state information for \s-1SSL\s0 objects created from ctx during connection setup and use. The setting for ctx is overridden from the setting for a specific \s-1SSL\s0 object, if specified. When callback is \s-1NULL,\s0 not callback function is used.

\fISSL_set_info_callback() sets the callback function, that can be used to obtain state information for ssl during connection setup and use. When callback is \s-1NULL,\s0 the callback setting currently valid for \fBctx is used.

\fISSL_CTX_get_info_callback() returns a pointer to the currently set information callback function for ctx.

\fISSL_get_info_callback() returns a pointer to the currently set information callback function for ssl.

Header "NOTES" When setting up a connection and during use, it is possible to obtain state information from the \s-1SSL/TLS\s0 engine. When set, an information callback function is called whenever the state changes, an alert appears, or an error occurs.

The callback function is called as callback(\s-1SSL\s0 *ssl, int where, int ret). The where argument specifies information about where (in which context) the callback function was called. If ret is 0, an error condition occurred. If an alert is handled, \s-1SSL_CB_ALERT\s0 is set and ret specifies the alert information.

\fBwhere is a bitmask made up of the following bits:

Item "SSL_CB_LOOP" Callback has been called to indicate state change inside a loop. Item "SSL_CB_EXIT" Callback has been called to indicate error exit of a handshake function. (May be soft error with retry option for non-blocking setups.) Item "SSL_CB_READ" Callback has been called during read operation. Item "SSL_CB_WRITE" Callback has been called during write operation. Item "SSL_CB_ALERT" Callback has been called due to an alert being sent or received. Item "SSL_CB_READ_ALERT (SSL_CB_ALERT|SSL_CB_READ)"

0

Item "SSL_CB_WRITE_ALERT (SSL_CB_ALERT|SSL_CB_WRITE)" Item "SSL_CB_ACCEPT_LOOP (SSL_ST_ACCEPT|SSL_CB_LOOP)" Item "SSL_CB_ACCEPT_EXIT (SSL_ST_ACCEPT|SSL_CB_EXIT)" Item "SSL_CB_CONNECT_LOOP (SSL_ST_CONNECT|SSL_CB_LOOP)" Item "SSL_CB_CONNECT_EXIT (SSL_ST_CONNECT|SSL_CB_EXIT)" Item "SSL_CB_HANDSHAKE_START"

Callback has been called because a new handshake is started.

Item "SSL_CB_HANDSHAKE_DONE 0x20" Callback has been called because a handshake is finished.

The current state information can be obtained using the \fISSL_state_string\|(3) family of functions.

The ret information can be evaluated using the \fISSL_alert_type_string\|(3) family of functions.

Header "RETURN VALUES" \fISSL_set_info_callback() does not provide diagnostic information.

\fISSL_get_info_callback() returns the current setting.

Header "EXAMPLES" The following example callback function prints state strings, information about alerts being handled and error messages to the bio_err \s-1BIO.\s0

.Vb 4 void apps_ssl_info_callback(SSL *s, int where, int ret) { const char *str; int w; \& w=where& ~SSL_ST_MASK; \& if (w & SSL_ST_CONNECT) str="SSL_connect"; else if (w & SSL_ST_ACCEPT) str="SSL_accept"; else str="undefined"; \& if (where & SSL_CB_LOOP) { BIO_printf(bio_err,"%s:%s\en",str,SSL_state_string_long(s)); } else if (where & SSL_CB_ALERT) { str=(where & SSL_CB_READ)?"read":"write"; BIO_printf(bio_err,"SSL3 alert %s:%s:%s\en", str, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret)); } else if (where & SSL_CB_EXIT) { if (ret == 0) BIO_printf(bio_err,"%s:failed in %s\en", str,SSL_state_string_long(s)); else if (ret < 0) { BIO_printf(bio_err,"%s:error in %s\en", str,SSL_state_string_long(s)); } } } .Ve

Header "SEE ALSO" \fIssl\|(3), SSL_state_string\|(3), \fISSL_alert_type_string\|(3)