mirror of
https://github.com/openssl/openssl.git
synced 2024-12-16 21:43:42 +08:00
154 lines
4.3 KiB
Plaintext
154 lines
4.3 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
SSL_CTX_set_info_callback, SSL_CTX_get_info_callback, SSL_set_info_callback, SSL_get_info_callback - handle information callback for SSL connections
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#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))();
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
SSL_CTX_set_info_callback() sets the B<callback> function, that can be used to
|
|
obtain state information for SSL objects created from B<ctx> during connection
|
|
setup and use. The setting for B<ctx> is overridden from the setting for
|
|
a specific SSL object, if specified.
|
|
When B<callback> is NULL, not callback function is used.
|
|
|
|
SSL_set_info_callback() sets the B<callback> function, that can be used to
|
|
obtain state information for B<ssl> during connection setup and use.
|
|
When B<callback> is NULL, the callback setting currently valid for
|
|
B<ctx> is used.
|
|
|
|
SSL_CTX_get_info_callback() returns a pointer to the currently set information
|
|
callback function for B<ctx>.
|
|
|
|
SSL_get_info_callback() returns a pointer to the currently set information
|
|
callback function for B<ssl>.
|
|
|
|
=head1 NOTES
|
|
|
|
When setting up a connection and during use, it is possible to obtain state
|
|
information from the SSL/TLS 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 B<callback(SSL *ssl, int where, int ret)>.
|
|
The B<where> argument specifies information about where (in which context)
|
|
the callback function was called. If B<ret> is 0, an error condition occurred.
|
|
If an alert is handled, SSL_CB_ALERT is set and B<ret> specifies the alert
|
|
information.
|
|
|
|
B<where> is a bitmask made up of the following bits:
|
|
|
|
=over 4
|
|
|
|
=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)
|
|
|
|
=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.
|
|
|
|
=back
|
|
|
|
The current state information can be obtained using the
|
|
L<SSL_state_string(3)|SSL_state_string(3)> family of functions.
|
|
|
|
The B<ret> information can be evaluated using the
|
|
L<SSL_alert_type_string(3)|SSL_alert_type_string(3)> family of functions.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
SSL_set_info_callback() does not provide diagnostic information.
|
|
|
|
SSL_get_info_callback() returns the current setting.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
The following example callback function prints state strings, information
|
|
about alerts being handled and error messages to the B<bio_err> BIO.
|
|
|
|
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\n",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\n",
|
|
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\n",
|
|
str,SSL_state_string_long(s));
|
|
else if (ret < 0)
|
|
{
|
|
BIO_printf(bio_err,"%s:error in %s\n",
|
|
str,SSL_state_string_long(s));
|
|
}
|
|
}
|
|
}
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ssl(3)|ssl(3)>, L<SSL_state_string(3)|SSL_state_string(3)>,
|
|
L<SSL_alert_type_string(3)|SSL_alert_type_string(3)>
|
|
|
|
=cut
|