SSL_CTX_set_mode(3) - NetBSD Manual Pages

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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


LIBRARY

       libcrypto, -lcrypto


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.

       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.


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.



1.0.1c                            2009-07-19               SSL_CTX_set_mode(3)