NetBSD/lib/libcrypto/man/SSL_CTX_sess_set_get_cb.3

.\"	$NetBSD: SSL_CTX_sess_set_get_cb.3,v 1.8 2003/07/24 14:16:44 itojun Exp $
.\"
.\" Automatically generated by Pod::Man version 1.02
.\" Thu Jul 24 13:08:11 2003
.\"
.\" Standard preamble:
.\" ======================================================================
.de Sh \" Subsection heading
.br
.if t .Sp
.ne 5
.PP
\fB\\$1\fR
.PP
..
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Ip \" List item
.br
.ie \\n(.$>=3 .ne \\$3
.el .ne 3
.IP "\\$1" \\$2
..
.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.  | will give a
.\" real vertical bar.  \*(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-|\(bv\*(Tr
.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" ''
'br\}
.\"
.\" If the F register is turned on, we'll generate index entries on stderr
.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
.\" index entries marked with X<> in POD.  Of course, you'll have to process
.\" the output yourself in some meaningful fashion.
.if \nF \{\
.    de IX
.    tm Index:\\$1\t\\n%\t"\\$2"
.    .
.    nr % 0
.    rr F
.\}
.\"
.\" For nroff, turn off justification.  Always turn off hyphenation; it
.\" makes way too many mistakes in technical documents.
.hy 0
.if n .na
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.bd B 3
.    \" 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_sess_set_get_cb 3"
.TH SSL_CTX_sess_set_get_cb 3 "0.9.7b" "2003-03-28" "OpenSSL"
.UC
.SH "NAME"
SSL_CTX_sess_set_new_cb, SSL_CTX_sess_set_remove_cb, SSL_CTX_sess_set_get_cb, SSL_CTX_sess_get_new_cb, SSL_CTX_sess_get_remove_cb, SSL_CTX_sess_get_get_cb \- provide callback functions for server side external session caching
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
.Ve
.Vb 6
\& void SSL_CTX_sess_set_new_cb(SSL_CTX *ctx,
\&                              int (*new_session_cb)(SSL *, SSL_SESSION *));
\& void SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx,
\&           void (*remove_session_cb)(SSL_CTX *ctx, SSL_SESSION *));
\& void SSL_CTX_sess_set_get_cb(SSL_CTX *ctx,
\&           SSL_SESSION (*get_session_cb)(SSL *, unsigned char *, int, int *));
.Ve
.Vb 3
\& int (*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx))(struct ssl_st *ssl, SSL_SESSION *sess);
\& void (*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx))(struct ssl_ctx_st *ctx, SSL_SESSION *sess);
\& SSL_SESSION *(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(struct ssl_st *ssl, unsigned char *data, int len, int *copy);
.Ve
.Vb 4
\& int (*new_session_cb)(struct ssl_st *ssl, SSL_SESSION *sess);
\& void (*remove_session_cb)(struct ssl_ctx_st *ctx, SSL_SESSION *sess);
\& SSL_SESSION *(*get_session_cb)(struct ssl_st *ssl, unsigned char *data,
\&               int len, int *copy);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_CTX_sess_set_new_cb()\fR sets the callback function, which is automatically
called whenever a new session was negotiated.
.PP
\&\fISSL_CTX_sess_set_remove_cb()\fR sets the callback function, which is
automatically called whenever a session is removed by the \s-1SSL\s0 engine,
because it is considered faulty or the session has become obsolete because
of exceeding the timeout value.
.PP
\&\fISSL_CTX_sess_set_get_cb()\fR sets the callback function which is called,
whenever a \s-1SSL/TLS\s0 client proposed to resume a session but the session
could not be found in the internal session cache (see
SSL_CTX_set_session_cache_mode(3)).
(\s-1SSL/TLS\s0 server only.)
.PP
\&\fISSL_CTX_sess_get_new_cb()\fR, \fISSL_CTX_sess_get_remove_cb()\fR, and
\&\fISSL_CTX_sess_get_get_cb()\fR allow to retrieve the function pointers of the
provided callback functions. If a callback function has not been set,
the \s-1NULL\s0 pointer is returned.
.SH "NOTES"
.IX Header "NOTES"
In order to allow external session caching, synchronization with the internal
session cache is realized via callback functions. Inside these callback
functions, session can be saved to disk or put into a database using the
d2i_SSL_SESSION(3) interface.
.PP
The \fInew_session_cb()\fR is called, whenever a new session has been negotiated
and session caching is enabled (see
SSL_CTX_set_session_cache_mode(3)).
The \fInew_session_cb()\fR is passed the \fBssl\fR connection and the ssl session
\&\fBsess\fR. If the callback returns \fB0\fR, the session will be immediately
removed again.
.PP
The \fIremove_session_cb()\fR is called, whenever the \s-1SSL\s0 engine removes a session
from the internal cache. This happens when the session is removed because
it is expired or when a connection was not shutdown cleanly. It also happens
for all sessions in the internal session cache when
SSL_CTX_free(3) is called. The \fIremove_session_cb()\fR is passed
the \fBctx\fR and the ssl session \fBsess\fR. It does not provide any feedback.
.PP
The \fIget_session_cb()\fR is only called on \s-1SSL/TLS\s0 servers with the session id
proposed by the client. The \fIget_session_cb()\fR is always called, also when
session caching was disabled. The \fIget_session_cb()\fR is passed the
\&\fBssl\fR connection, the session id of length \fBlength\fR at the memory location
\&\fBdata\fR. With the parameter \fBcopy\fR the callback can require the
\&\s-1SSL\s0 engine to increment the reference count of the \s-1SSL_SESSION\s0 object,
Normally the reference count is not incremented and therefore the
session must not be explicitly freed with
SSL_SESSION_free(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
ssl(3), d2i_SSL_SESSION(3),
SSL_CTX_set_session_cache_mode(3),
SSL_CTX_flush_sessions(3),
SSL_SESSION_free(3),
SSL_CTX_free(3)