200 lines
6.8 KiB
Groff
200 lines
6.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "d2i_SSL_SESSION 3"
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.TH d2i_SSL_SESSION 3 "2014-08-06" "1.0.1i" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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d2i_SSL_SESSION, i2d_SSL_SESSION \- convert SSL_SESSION object from/to ASN1 representation
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length);
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\& int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fId2i_SSL_SESSION()\fR transforms the external \s-1ASN1\s0 representation of an \s-1SSL/TLS\s0
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session, stored as binary data at location \fBpp\fR with length \fBlength\fR, into
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an \s-1SSL_SESSION\s0 object.
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.PP
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\&\fIi2d_SSL_SESSION()\fR transforms the \s-1SSL_SESSION\s0 object \fBin\fR into the \s-1ASN1\s0
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representation and stores it into the memory location pointed to by \fBpp\fR.
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The length of the resulting \s-1ASN1\s0 representation is returned. If \fBpp\fR is
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the \s-1NULL\s0 pointer, only the length is calculated and returned.
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.SH "NOTES"
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.IX Header "NOTES"
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The \s-1SSL_SESSION\s0 object is built from several \fImalloc()\fRed parts, it can
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therefore not be moved, copied or stored directly. In order to store
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session data on disk or into a database, it must be transformed into
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a binary \s-1ASN1\s0 representation.
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.PP
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When using \fId2i_SSL_SESSION()\fR, the \s-1SSL_SESSION\s0 object is automatically
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allocated. The reference count is 1, so that the session must be
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explicitly removed using \fISSL_SESSION_free\fR\|(3),
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unless the \s-1SSL_SESSION\s0 object is completely taken over, when being called
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inside the \fIget_session_cb()\fR (see
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\&\fISSL_CTX_sess_set_get_cb\fR\|(3)).
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.PP
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\&\s-1SSL_SESSION\s0 objects keep internal link information about the session cache
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list, when being inserted into one \s-1SSL_CTX\s0 object's session cache.
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One \s-1SSL_SESSION\s0 object, regardless of its reference count, must therefore
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only be used with one \s-1SSL_CTX\s0 object (and the \s-1SSL\s0 objects created
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from this \s-1SSL_CTX\s0 object).
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.PP
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When using \fIi2d_SSL_SESSION()\fR, the memory location pointed to by \fBpp\fR must be
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large enough to hold the binary representation of the session. There is no
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known limit on the size of the created \s-1ASN1\s0 representation, so the necessary
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amount of space should be obtained by first calling \fIi2d_SSL_SESSION()\fR with
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\&\fBpp=NULL\fR, and obtain the size needed, then allocate the memory and
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call \fIi2d_SSL_SESSION()\fR again.
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Note that this will advance the value contained in \fB*pp\fR so it is necessary
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to save a copy of the original allocation.
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For example:
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int i,j;
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char *p, *temp;
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i = i2d_SSL_SESSION(sess, \s-1NULL\s0);
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p = temp = malloc(i);
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j = i2d_SSL_SESSION(sess, &temp);
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assert(i == j);
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assert(p+i == temp);
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fId2i_SSL_SESSION()\fR returns a pointer to the newly allocated \s-1SSL_SESSION\s0
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object. In case of failure the NULL-pointer is returned and the error message
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can be retrieved from the error stack.
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.PP
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\&\fIi2d_SSL_SESSION()\fR returns the size of the \s-1ASN1\s0 representation in bytes.
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When the session is not valid, \fB0\fR is returned and no operation is performed.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIssl\fR\|(3), \fISSL_SESSION_free\fR\|(3),
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\&\fISSL_CTX_sess_set_get_cb\fR\|(3)
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