Edit File: SSL_get_mode.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "SSL_CTX_set_mode 3" .TH SSL_CTX_set_mode 3 "2019-12-20" "1.0.2u" "OpenSSL" .\" For nroff, turn off justification. 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.