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Title "SSL_CTX_set_mode 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
SSL_CTX_set_mode, SSL_set_mode, SSL_CTX_get_mode, SSL_get_mode - manipulate SSL engine mode 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 Header "DESCRIPTION" \fISSL_CTX_set_mode() adds the mode set via bitmask in mode to ctx. Options already set before are not cleared.

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

\fISSL_CTX_get_mode() returns the mode set for ctx.

\fISSL_get_mode() returns the mode set for ssl.

Header "NOTES" The following mode changes are available: 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), \fISSL_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 \fISSL_read\|(3) or SSL_write\|(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. 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. Header "RETURN VALUES" \fISSL_CTX_set_mode() and SSL_set_mode() return the new mode bitmask after adding mode.

\fISSL_CTX_get_mode() and SSL_get_mode() return the current bitmask.

Header "SEE ALSO" \fIssl\|(3), SSL_read\|(3), SSL_write\|(3) Header "HISTORY" \s-1SSL_MODE_AUTO_RETRY\s0 as been added in OpenSSL 0.9.6.