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SSL_CTX_set_mode(3)                                OpenSSL                               SSL_CTX_set_mode(3)



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

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);

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

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

       SSL_CTX_get_mode() returns the mode set for ctx.

       SSL_get_mode() returns the mode set for ssl.

NOTES
       The following mode changes are available:

       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().

       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().

       SSL_MODE_AUTO_RETRY
           Never bother the application with retries if the transport is blocking.  If a renegotiation take
           place during normal operation, a SSL_read(3) or 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.

RETURN VALUES
       SSL_CTX_set_mode() and SSL_set_mode() return the new mode bitmask after adding mode.

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

SEE ALSO
       ssl(3), SSL_read(3), SSL_write(3)

HISTORY
       SSL_MODE_AUTO_RETRY as been added in OpenSSL 0.9.6.



50                                               2013-03-05                              SSL_CTX_set_mode(3)