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Revision cacdfcb2479984d9bfcc79b623118d8af6fea169 authored by Ben Laurie on 01 February 2014, 18:29:26 UTC, committed by Ben Laurie on 01 February 2014, 18:30:23 UTC
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  • SSL_CTX_set_mode.pod
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SSL_CTX_set_mode.pod
=pod

=head1 NAME

SSL_CTX_set_mode, SSL_set_mode, SSL_CTX_get_mode, SSL_get_mode - manipulate SSL engine mode

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 long SSL_CTX_set_mode(SSL_CTX *ctx, long mode);
 long SSL_set_mode(SSL *ssl, long mode);

 long SSL_CTX_get_mode(SSL_CTX *ctx);
 long SSL_get_mode(SSL *ssl);

=head1 DESCRIPTION

SSL_CTX_set_mode() adds the mode set via bitmask in B<mode> to B<ctx>.
Options already set before are not cleared.

SSL_set_mode() adds the mode set via bitmask in B<mode> to B<ssl>.
Options already set before are not cleared.

SSL_CTX_get_mode() returns the mode set for B<ctx>.

SSL_get_mode() returns the mode set for B<ssl>.

=head1 NOTES

The following mode changes are available:

=over 4

=item SSL_MODE_ENABLE_PARTIAL_WRITE

Allow SSL_write(..., n) to return r with 0 < r < n (i.e. report success
when just a single record has been written). When not set (the default),
SSL_write() will only report success once the complete chunk was written.
Once SSL_write() returns with r, r bytes have been successfully written
and the next call to SSL_write() must only send the n-r bytes left,
imitating the behaviour of write().

=item SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER

Make it possible to retry SSL_write() with changed buffer location
(the buffer contents must stay the same). This is not the default to avoid
the misconception that non-blocking SSL_write() behaves like
non-blocking write().

=item SSL_MODE_AUTO_RETRY

Never bother the application with retries if the transport is blocking.
If a renegotiation take place during normal operation, a
L<SSL_read(3)|SSL_read(3)> or L<SSL_write(3)|SSL_write(3)> would return
with -1 and indicate the need to retry with SSL_ERROR_WANT_READ.
In a non-blocking environment applications must be prepared to handle
incomplete read/write operations.
In a blocking environment, applications are not always prepared to
deal with read/write operations returning without success report. The
flag SSL_MODE_AUTO_RETRY will cause read/write operations to only
return after the handshake and successful completion.

=item SSL_MODE_RELEASE_BUFFERS

When we no longer need a read buffer or a write buffer for a given SSL,
then release the memory we were using to hold it.  Released memory is
either appended to a list of unused RAM chunks on the SSL_CTX, or simply
freed if the list of unused chunks would become longer than 
SSL_CTX->freelist_max_len, which defaults to 32.  Using this flag can
save around 34k per idle SSL connection.
This flag has no effect on SSL v2 connections, or on DTLS connections.

=back

=head1 RETURN VALUES

SSL_CTX_set_mode() and SSL_set_mode() return the new mode bitmask
after adding B<mode>.

SSL_CTX_get_mode() and SSL_get_mode() return the current bitmask.

=head1 SEE ALSO

L<ssl(3)|ssl(3)>, L<SSL_read(3)|SSL_read(3)>, L<SSL_write(3)|SSL_write(3)>

=head1 HISTORY

SSL_MODE_AUTO_RETRY as been added in OpenSSL 0.9.6.

=cut
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