SSL_CTX_set_mode.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_CTX_set_mode, SSL_set_mode, SSL_CTX_get_mode, SSL_get_mode \- manipulate SSL engine mode .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #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); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_CTX_set_mode()\fR adds the mode set via bitmask in \fBmode\fR to \fBctx\fR. Options already set before are not cleared. .PP \&\fBSSL_set_mode()\fR adds the mode set via bitmask in \fBmode\fR to \fBssl\fR. Options already set before are not cleared. .PP \&\fBSSL_CTX_get_mode()\fR returns the mode set for \fBctx\fR. .PP \&\fBSSL_get_mode()\fR returns the mode set for \fBssl\fR. .SH "NOTES" .IX Header "NOTES" The following mode changes are available: .IP "\s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0" 4 .IX 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), \&\fBSSL_write()\fR will only report success once the complete chunk was written. Once \fBSSL_write()\fR returns with r, r bytes have been successfully written and the next call to \fBSSL_write()\fR must only send the n\-r bytes left, imitating the behaviour of \fBwrite()\fR. .IP "\s-1SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER\s0" 4 .IX Item "SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER" Make it possible to retry \fBSSL_write()\fR with changed buffer location (the buffer contents must stay the same). This is not the default to avoid the misconception that non-blocking \fBSSL_write()\fR behaves like non-blocking \fBwrite()\fR. .IP "\s-1SSL_MODE_AUTO_RETRY\s0" 4 .IX 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 \&\fBSSL_read\fR\|(3) or \fBSSL_write\fR\|(3) would return with \-1 and indicate the need to retry with \s-1SSL_ERROR_WANT_READ.\s0 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 \s-1SSL_MODE_AUTO_RETRY\s0 will cause read/write operations to only return after the handshake and successful completion. .IP "\s-1SSL_MODE_RELEASE_BUFFERS\s0" 4 .IX Item "SSL_MODE_RELEASE_BUFFERS" When we no longer need a read buffer or a write buffer for a given \s-1SSL,\s0 then release the memory we were using to hold it. Released memory is either appended to a list of unused \s-1RAM\s0 chunks on the \s-1SSL_CTX,\s0 or simply freed if the list of unused chunks would become longer than \&\s-1SSL_CTX\-\s0>freelist_max_len, which defaults to 32. Using this flag can save around 34k per idle \s-1SSL\s0 connection. This flag has no effect on \s-1SSL\s0 v2 connections, or on \s-1DTLS\s0 connections. .IP "\s-1SSL_MODE_SEND_FALLBACK_SCSV\s0" 4 .IX Item "SSL_MODE_SEND_FALLBACK_SCSV" Send \s-1TLS_FALLBACK_SCSV\s0 in the ClientHello. To be set only by applications that reconnect with a downgraded protocol version; see draft\-ietf\-tls\-downgrade\-scsv\-00 for details. .Sp \&\s-1DO NOT ENABLE THIS\s0 if your application attempts a normal handshake. Only use this in explicit fallback retries, following the guidance in draft\-ietf\-tls\-downgrade\-scsv\-00. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBSSL_CTX_set_mode()\fR and \fBSSL_set_mode()\fR return the new mode bitmask after adding \fBmode\fR. .PP \&\fBSSL_CTX_get_mode()\fR and \fBSSL_get_mode()\fR return the current bitmask. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBssl\fR\|(3), \fBSSL_read\fR\|(3), \fBSSL_write\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1SSL_MODE_AUTO_RETRY\s0 as been added in OpenSSL 0.9.6.
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